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Feb. 22-, 1949.
2,462,779
R, c. RussgLL
GEAR SHIF'I‘ING MECHANISM
5 Sheets-Sheet 1
Filed April 19, 1945
INVENTOR.
Faieri C.’ Z’aase‘l
BY
M % V/M,
?rroznvins.
Feb. 22, 1949-
R. c. RUSSELL
2,462,779
GEAR SHIFTING MECHANISM
Filed April 19, L945
5 Sheets-Sheet 2
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A56
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M6
EL}. A”
IN VEN TOR.
?ak/Z (5 72321912:
Feb. 22, 1949.
R. c. RUSSELL
2,462,779
GEAR SHIFTING MECHANISM
Filed April 19, 1945
5 Sheets-Sheet 3
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2761.”: a irwezz
BY
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v?izz.
?rronwEys.
“Patented Feb. 22, 1949
2,462,779
UNITED STATES PATENT OFFICE
2,482,779
GEAR SHIFTING DIECHANISM
Robert 0. Russell, Cleveland Heights, Ohio, as
signor to Baton Manufacturing Company,
Cleveland, Ohio, a corporation of Ohio
Application April 19, 1945, Serial No. 589,201
20 Claims. (Cl. ‘IL-365)
1
2
This invention relates to gear shifting mech
anism and particularly to mechanism wherein a
change speed gear mechanism may be power
shifted between two diilerent positions and con
trolled from a remote point, the principal object
being the provision of mechanism of the type de
scribed having certain advantages over prior art
form of means is employed for controlling the
direction of rotation of the electric motor;
and the provision of a construction as above
described in which the spring means comprises
a sin gle torsion spring.
Other objects of the invention include the pro
vision of an operating device comprising a pair of
relatively rotatable parts and a torsion spring in
structures of a similar type. It is a continuation
terconnecting them; the construction and ar
in part of my application for Letters Patent voi
the United States on the same subject ?led June 10 rangement being such that energy may be stored
up in the spring by rotation of one of the members
12, 1944 and serially numbered 539,911 now aban
doned.
-
Objects of the invention include the provision
of means for shifting a torque transmitting ele
ment of a change speed mechanism between two
different positions of operation, so constructed
and arranged as to permit pre-selection of the
shiftable position but without any shifting actu—
ally taking place until the torque transmitted
through the shiftable element is materially re
duced from that normally transmitted through
it during operation; the provision 01’ a construc
either one way or another from a normal spring
position, which is a wound-up or preloaded as
sembly position of the spring, so as to be capable
of e?‘ecting movement of the other of said mem
bers in a corresponding direction; the provision
of a construction as above described in which
relative rotation between the members of at least
180 degrees is possible; the provision of a con
20 struction as above described in which relative
, rotation of one of the members in either direction
tends to stress the spring for operating the other
member in the same direction; and the provision
of a spring energized unit of new and novel con
effecting the shifting of the shiftable element is
built up immediately upon preselectionof the 25 struction.
The above being among the objects of the
shiftable position so as to be instantaneously
present invention, the same consists in certain
available for the shifting operation upon a reduc
novel features of construction andcombinations
tion in torque transmitted through the shiftable
of parts to be hereinafter described with refer
element; the provision of a construction as above
described in which the power for effecting the 30 ence to the accompanying drawing, and then
claimed, having the above and other objects in
shifting of the shiftable elements is stored up
view.
upon pre-selection in a spring element and is
In the ‘accompanying drawings, which illus
available for the shifting operation the moment
trate suitable embodiments of the present inven
the torque being transmitted through the shift
able element is reduced to a point where shifting 35 tion and in which like numerals refer to like parts
throughout the several different views.
of the shiftable element is possible under the
Fig. 1 is a partially broken, partially sectioned,
amount of power thus stored up in the spring
and partially fragmentary view taken centrally
element; the provision of a construction as above
described in which an electric motor is employed
through mechanism constructed in accordance
for storing up the power or energy in the afore 40 with the present invention showing the same oper
mentioned spring element; the provision of a
atively associated with a shiftable element of
construction as above described in which the act
a change speed gear mechanism and showing the
tion as above described in which the power for
of pre-selecting a gear change of the speed change
mechanism automatically energizes an electric
‘ electrical control system therefor in more or less
diagrammatic representation and illustrating its
motor to cause energy to be immediately stored‘ 45- relation to other operative parts of a motor ve
up in said spring means, thereby to render it fully
hicle;
active upon said reduction in torque through the
Fig. 31a is a more detailed wiring diagram of the
shiftable member; the provision of a construction
electrical control‘ system shownin-Fig. 1; l
as above described in which the electric motor is
Fig. '2 "is a fragmentary horizontal, sectional
reversible and is operable to store up energy in the 50
view taken centrally through the differential and
spring means e?'ective in both directions whereby
change speed mechanism of a two-speed rear axle
to enable the above described effect to be obtained
regardless of the direction in which the_shiftable
structure, illustrating the present invention ap
plied thereto for the purpose of shifting the shift
element is to be shifted; the provision of a con
struction as above described in which a novel 56 able element of the two-speed axle structure;
a
9,462,77 9
‘
3
Fig. 3 is an enlarged fragmentary, vertical sec
tional view taken on the line 3-4 of Fig. 2;
Fig. 4 is a fragmentary horizontal, sectional
view taken approximately on the line 4—-4 of Fig.
3 and illustrating the spring unit in plan view;
Fig. 5 is a vertical sectional view taken on the
of the spring which is employed for shifting the
element in a reverse direction. The spring load
is unchanged under most conditions, but the
vacuum power for shifting varies with altitude
being high at sea level and low in mountainous
regions. In accordance with the present inven
tion, a mechanism is provided wherein the force
line 5-5 of Fig. 3:
Fig. 6 is a fragmentary, vertical sectional view
provided for shifting the shiftable element may
taken on the line 6-8 of Fig. 3;
be the same regardless of the direction of shift
Fig. 7 is an enlarged, fragmentary, partially 10 ing
and may be built up to any desired degree so
broken, partially sectioned view taken on the line
as to insure positive and effective shifting under
‘|—‘| of Fig. 5;
any circumstances. Furthermore, it is such that
Fig. 8 is an enlarged perspective view of the
the actuating pressure is built up immediately
brake element employed between the nut and
upon pre-selection of the desired shiftable move
screw of the structure shown in Fig. 7;
15 ment and is instantaneously available the mo
Fig. 9 is a view similar to Fig. 3 but illustrating
ment the torque on the shiftable element is re‘
a modi?ed form of torsion spring structure or
duced su?iciently to permit. the mechanism to
unit and operating mechanism therefor applied
overcome its friction and without affecting nor
to the structure shown in the preceding figures;
mal
operation of the engine; closing the throttle
Fig. 10 is a fragmentary, horizontal sectional 20
being
unnecessary to establish sumcient power to
view taken on the line i?-l ll of Fig. 9;
effect the shifting as in the case of vacuum oper
Fig. 11 is a schematic, enlarged transverse, sec
ated devices of this type.
tional view through the torsion spring mech
First, referring to Fig. 2 to explain the con
anism as on the line ll—ll of Fig. 10 and show
struction and operation of a two-speed axle me
ing the same in neutral position: and,
25 chanism to which the present invention is shown
Figs. 12 and 13 are views similar to Fig. 11 but
applied, it will be seen to include a cast differen
illustrating the torsion spring mechanism ten
sioned in positions of opposite rotation.
While the present invention has application to
tial housing indicated generally at 2ll. from op
posite sides of which project the usual axle hous
ing tubes 22 through which the axles or jack
any construction including a shiftable element 30 shafts 24 project and are enclosed. The inner
splined ends of the axle shafts 24 are non-ro
through which torque is applied in operation and
wherein shifting of the element during the trans
mission of material torque therethrough is im
possible, or at least impractical, because of the
friction that would have to be overcome to shift
it while under a torque load, it is particularly
adaptable for use in connection with a shiftable
tatably received in the complementary bores of
the beveled gears 25 and 28, respectively, in a
conventional manner, and the latter are opera~
tively interconnected by a plurality of beveled
gears 30 in mesh with both thereof and carried
on pins 32 fixed in the differential carrier 34
which thus surrounds the differential gears. The
differential carrier 34 is rotatably mounted upon
40
will only be referred to herein, those skilled in
the extended hubs oi’ the gears 28 and 2B, respec
the art thus being able to recognize its applica
vtively, and its right-hand end as viewed in Fig.
tion to broader uses of the type described.
2 is extended as at 36 and has mounted on such
In adapting the present invention to the
extended end in concentric relation therewith a.
change speed mechanism of a motor vehicle, it
clutch ring 38 fixed against relative rotation with
obviously may be applied to such change speed 45 respect
thereto by means of pins 40. The clutch
mechanism whether the latter is embodied in a
ring 38 is provided with internal clutch teeth 42
conventional transmission mounted directly upon
arranged concentrically with and in radially out
element of change speed mechanisms for motor
vehicles and for this reason the latter application
one end of the engine therefor or whether it is of
the type embodied in the driving axle structure
w:.rdly spaced relation to the right-hand shaft
2 .
for such vehicle. Inasmuch as in the latter type 50
The differential carrier 34 at a plurality and
of construction it is more di?icult to extend
preferably at three equally angularly spaced
mechanical connections from the change speed
points about its rotatable axis and at equal dis
mechanism to a point convenient to the operator
tance from the axis radially outwardly beyond
of the vehicle than in the former case, and in
the corresponding axle shaft 24 is provided with
view of the fact that in accordance with the
a corresponding number of axially parallel pins
present invention no such mechanical connec
44. The pins 44 are supported at their ends, and
tions are necessary, the construction is particu
between their ends each rotatably supports
larly adaptable to the rear axle type of construc
thereon a pinion planet gear 46, the carrier 34
tion and, accordingly, is shown in connection
being cut away to permit each gear 46 to project
00
therewith in the accompanying drawing, its ap
radially outwardly therebeyond or at least to be
plication to the former type of construction thus
exposed therethrough.
being made apparent to those skilled in the art.
Arranged in surrounding relationship with re
In mechanisms of the type described, structures
spect to the differential carrier 34 is a ring gear
have heretofore been suggested which employ a 65 carrier 50, the opposite ends of which are rotatably
vacuum cylinder to move the shiftable element in
mounted by means of antifriction bearing assem
one direction and against spring pressure which
blies 52 arid 54, respectively, carried by the diifer
is relied upon to shift the element in the opposite
ential housing 20. A ring gear 56 disposed con
direction upon dissipation of the vacuum. There
centrically with the axle shafts 24 is ?xed to the
are certain limitations in such type of construc
carrier 50 by means of bolts 58 and lies in mesh
70
tions that are di?icult to overcome. For in
with the pinion gear ill suitably mounted in the
stance, because of clearance required for the
differential housing 20 by means of antifriction
frame structure of the vehicle, the diameter of
bearing assemblies 62 and 64, respectively. It'will
the vacuum cylinder is necessarily limited and
be noted from an inspection of Fig. 2 that the ring
additionally it is required to overcome the force 75 gear 56 is of annular character and its bore is
I
2,402,719
6
formed with teeth 66 forming an internal gear
concentric with the axle shafts 24 and lying in
mesh with the planet pinions 48.
The ring gear carrier III at its right-hand end
is bored out concentrically with the correspond
ing axle shafts 24, but to a greater diameter.
Axially slidably mounted in the bore in the right
hand end of the carrier 50 and surrounding the
right-hand axle shaft 241s a sleeve member ‘III the
axially inner end of which is provided with gear
teeth ‘I! providing a pinion sun gear of such di
ameter as to mesh with the pinion gears 45 when
radially aligned therewith, as well as of such
diameter as to be interlocked with the clutch
teeth 42 of the differential carrier 34 when inter
engaged therewith. In other words, the diameter
of the pinion gear 12 is such as to be capable of
being received in inter?tting relation within the
teeth 42 when the sleeve ‘Ill is shifted axially to
bring about this condition, thereby to lock the
sleeve ‘Hi against relative rotation with respect to
other hand, if the sleeve 10 is shifted axially
enough to bring the teeth 14 and ‘I6 out of engage
ment with each other and to bring the teeth of the
pinion 12 into operative engagement with the
teeth 42 of the differential carrier 34, at which
time the teeth of the pinion ‘I2 are still in opera‘
tlve engagement with respect t6 the teeth of the
pinions 46, the differential carrier is thereupon
locked for equal rotation with respect to the ring
III gear carrier 50 and consequently upon rotation of
the ring gear 56, as by means of the pinion 60,
the axle shafts 24 are caused to rotate equally with
the ring gear 56. This last described position of
the sleeve ‘III is the high speed position of opera
tion of the two speed axle shown.
As before mentioned, the device of the present
invention has for its object the shifting of a shift
able element of a change speed transmission and
which, in the two speed axle construction illus
trated in Fig. 2, is the sleeve 10. The device of
the present invention effects axial shifting move
the differential carrier 34.
ment of the sleeve ‘ill by means of a double armed
The sleeve ‘Hi is also provided with a concentric
lever indicated generally at Bl), one end of which
circular series of teeth 14 on its periphery ad
is yoked and ?ts over the axially outer end of
jacent its right-hand end, as viewed in Fig. 2. 25 the sleeve 10. The opposite arms of the yoke
The teeth 14 are adapted to be interengaged with
are each provided with an inwardly directed pin
complementary teeth 16 formed on a ring mem
82, as best brought out in Fig, 3, which pins are
ber 18 suitably ?xed against rotation with and
received in a peripheral groove 84 in the sleeve
14 on diametrically opposite sides of the axis of
carried by the differential housing 20. The teeth
16 are so located axially of the structure that 30 the latter. The lever 80 is nonrotatably mounted
when the pinion gear 12 is fully in mesh with the
internal gear 68 formed on the ring gear 58, the
teeth 14 and T6 are engaged with each other,
thereby locking the sleeve 10 and its sun gear ‘l2
against rotation.
It will thus be appreciated that the teeth 42
serve in the nature of clutch teeth adapted to en
gage the teeth of the pinion or sun gear ‘I2 to lock
the latter and, therefore, the sleeve ‘ill against
relative rotation with respect to the differential
carrier 34, and that the teeth 14 and it serve as
inter-engageable clutch teeth which, when en
gaged with each other, lock the sleeve '10 against
rotation with respect to the differential housing
ill. When the teeth 14 and 16 are in engagement
with each other and the sleeve ‘Ill, therefore, held
stationary, it will be appreciated that the pinion B8
in turning the ring gear 16 about the axes of the
shafts 24, because of interengagement of the in
ternal gear teeth 66 with the pinion or planet
gears 46, will cause the pinions or planet gears 46
to bodily travel about the pinion or sun gear 12 at
a slower rate of rotation than the ring gear 56
travels about the axes of the shafts 24. The
pinion or planet gears 46 being ?xed to the differ
ential carrier 34, they will thus cause the differen
tial carrier 34 and consequently the shafts 24 to
upon a pin 86 mounted at its opposite end with
a hollow boss 88 integral with the differential
housing 20, the pin 86 being retained against
axial displacement in the boss 88 by means of a
rounded end ilil, shown in Fig. 3, on a screw 92
and engaged in a peripheral groove 94 of the pin
86.
Power is applied to the outer end of the
arm at by the device of the present invention in
order to cause it to pivot about the axis of the
40 pin 86 and thereby effect axial shifting move
ment of the sleeve ‘Ill.
The device of the present invention includes
a cast metal housing indicated generally at I00
having an open inner end of substantially the
45 same cross-sectional area and con?guration as
the open outer end of the hollow boss 88 and
provided with an outturned ?ange Hi2 which is
?xed to the outer end of the boss 88 by means of
screws I04, as well as the screw 92 previously
50 mentioned and employed for retaining the pin
86 against axial displacement. The lower outer
end of the housing I00 is also open and is closed
by a cover plate Hi6. Mounted between the
housing Hill and cover plate I 08 below the center
55 line of the double armed lever 80 and preferably
with its axis in radial relation with respect to
the axis of the pin 86, is a pin I08 upon which
is rotatably mounted a pair of members H0 and
rotate at a slower speed of rotation than the speed
H2 arranged in end-to-end and preferably abut
of rotation of the ring gear 56. Thus a low speed
axle drive is provided when the sleeve ‘I0 is in the 60 ing relationship, as brought out in Fig. 3.
The inner member III) is provided with a ra
axial position shown in Fig. 2.
dially extending arm portion H4 at its inner end
If now the sleeve 10 is shifted to the right as
to which is ?xed in eccentric relation with re
viewed in Fig. 2 from the position shown, the
spect to the pin I08 and centrally of the double
teeth 14 and 16 will be released from engagement
with respect to each other and the sleeve ‘ill will 65 armed lever 80 a pin H6 arranged with its axis
parallel to the pin I08. Rotatably mounted upon
then be free to rotate in the differential housing
the pin H6 is a ball member H8. As best
20. If the teeth 14 and 16 are separated axially
brought out in Fig. 4, the ball member H8 is
from one another only enough to eifect axial sepa
slidably received in a diametrical slot I20 formed
ration and not enough to bring the teeth of the
pinion 12 into engagement with the teeth 42 of 70 in the enlarged outer end of a member I22 re
ceived within a radially directed bore formed
the differential carrier 34, then the driving con
in the outer arm of the double armed lever 80.
nection between the ring gear 56 and the shafts
the diametrical slot. iZil being arranged with its
24 is broken and the gearing is then in a position
longitudinal center line in parallel relation with
which corresponds to a neutral or inoperative
positive of a change speed transmission. on the 75 respect to the axis of the pin 86.
2,402,779
The member H2 at its axially outer end, and
as best brought out in Figs. 5 and 6, is provided
with a pair of integral radially outwardly directed
arms I30 and I 32. respectively, these arms being
8
that the end I42 is brought into engagement with
the ?nger I34 oi the member III, and upon con
tinuing such direction or movement will tension
the spring I40 in a direction to move the ?nger
angularly spaced from one another about the
I34 and consequently the member I I0 to the right.
axis of the pin I03.
as viewed in Fig. 4, thus acting through the ball
As best brought out in Figs. 3 and 4, the arm
III to cause the double armed lever 60 to pivot
H4 01' the member H0 is provided at its radially
in a counterclockwise direction about the axis
outer end with an axially outwardly directed
of the pin 66 and thereby tend to shift the sleeve
?ange or ?nger portion I34, and the arm I30 oi 10 10 to the position illustrated in Fig. 2.
the member [I2 is provided at its outer end with
If either of the above described movements of
an axially inwardly directed ?ange or ?nger por
the member II 2 is caused at a time that a force
tion I36, the ?nger portions I34 and I36 extend
is holding the double armed lever 60 against Div
ing into overlapping relation axially of the pin
otal movement su?lcient to overcome the force
I03 and the ?nger portion I36 being located ra ll or the spring I40, it will be appreciated that the
dially inwardly with respect to the axis of the
spring I40 can be wound up either clockwise or
pin I03 from the ?ange or ?nger portion I34 so
counterclockwise from its normal position, or pre
as “to enable it to swing freely past the overlap
loaded position, and it such spring force on the
ping portion of the ?nger I34 during relative ro
member H2 is maintained the spring I40 will re
tation of the members I I0 and I I2.
main under such stress until the force resisting
A relatively heavy coil torsion spring I40 is
movement of the double armed lever 00 is re
arranged in freely surrounding relation with re
lieved, at which time the force thus built up in
spect to the members H0 and H2 between the
the spring will become effective to shift the dou
arms ‘ H4 and I30, respectively, thereof.
The
ble armed lever 80 and cause a corresponding
axially inner free end oi.’ the spring I40 is brought 25 shifting movement of the shii‘table element of
radially outside of the coil, then bent axially for
the transmission, in the case shown by way of
wardly and then radially outwardly as at I42 in
illustration, the sleeve 10.
alignment with the overlapped portions of the
Thwe skilled in the art appreciate the fact
?ngers I34 and I36, and the axially outer free
that when a material amount of torque is being
end of the coil is similarly bent radially outwardly
transmitted through the shiftable element of a
beyond the coil, then axially inwardly, and then
change speed transmission, the friction between
radially outwardly as at I44 and into a plane
the teeth of the shii’table element and the mesh
perpendicular to the axis of the pin I06 within
ing gear element through which the torque is
the overlapped portions of the ?ngers I34 and
also being transmitted oilers an unusually high
I36. As best brought out in Fig. 3, the ends I42 85 amount of resistance to shifting of the shiftable
and I44 project radially of the pin I03 beyond
element. This, in fact, is of an advantage up
the outer ?nger I34 and, as brought out in Fig.
to a. certain extent inasmuch as when a driving
4, the ?ngers I34 and I36 are preferably notched
force is being exerted through the shiitabie ele
as at I46 on opposite sides of each thereof for
ment it is normally undesirable to eifect shift
reception of the ends I42 and I44 and so as to 40 ing of the same, for well understood reasons. At
prevent inadvertent axial displacement of such
the same time, when the torque being transmit
ends with respect to the ?ngers in operation.
ted through the shiftable element has been sub
Because of the construction described. it will
stantially relieved, it is desirable that it be shitt
be appreciated that the member I I2 may be turned
ed promptly and surely. Thus in the present case
in either direction of rotation and because its 45 the member I I2 may be rotated in either one di
?nger I36 can pass under ,the end of the‘ ?nger
rection or the other, depending upon which di
I34 it is enabled to engage either end I42 or I44
rection it is desired to pivot the double armed
of the spring I40 and apply a turning force
lever 80, and as long as a material amount of
to the spring in either direction as a result there
torque is being transmitted through the Pinion
of. In the position of the members H0 and 60 12 on the sleeve 10, the friction between the teeth
H2 and, therefore, the ?ngers I34 and I36 shown
of the pinion ‘I2 and the teeth of the pinions 46
in Figs. 4, 5, and 6, it may be assumed that the
will be su?icien-t to overcome the force or the
member H2 is being turned in a direction to
spring I40.‘ However, the spring I40 may be made
move the ?nger I36 to the left, thus causing the
Of such strength that under such conditions when
lefthand edge of the ?nger I36 to engage the 55 the torque being transmitted through the pinion
end I42 of the spring I40, thereby tending to
‘I2 is substantially relieved, the force of the spring
turn the spring I40 about the axis of the pin
will effectively and surely shift the sleeve ‘I0 to
I08 and to cause the end I44 to engage the right~
the desired opposite position of operation.
hand edge of the ?nger I34 and thereby to tend
The means provided for shifting the member
to turn the member H0 in a corresponding di 60 I I2 as above described is or particular importance
rection. If the double armed lever 80 is free to
in connection with the present invention. This
turn under such conditions. the force of the spring
is accomplished in the following manner. As
I40 acting against the finger I34 will turn the
best illustrated in Figs. 5 and 6, it will be noted
member H0 in a corresponding direction thus
that an electric motor I50 is housed within and
causing the bail III to be moved to the left, as 65 locked against axial and rotational movement
viewed in Fig. 4, and cause the double armed
within the housing I00. This is accomplished by
lever 80 to be moved in a clockwise direction of
providing an annular seat I52 in an upward ex
rotation about the axis of the pin 66 thereby to
tension of the housing I00 and against which
shift the sleeve ‘I0 to its position of high speed
the lower edge of the housing for the electric
operation for the rear axle mechanism. On the 70 motor I50 seats. This portion of the housing I00
other hand, it the member H2 is turned in the
is open at its upper end and is closed by a cover
opposite direction from the position shown in
member I64 secured thereto by screws I 66. The
Fig. 4, it will pass below the ?nger I34 and be
cover member I54 bears against the motor I50
brought into engagement with the end I 44 of
and serves to securely clamp it against the seat
the spring I40 at substantially the same time 78 I62, thus e?ecting the desired result.
9,488,779
0
10
The motor I00 is arranged with its axis vertical
and horizontally o?set from the axis of the pin
I00. Its shai't I00 projects downwardly into the
housing and into the bore of the vertically dis
posed screw element I00 in which it is suitably
secured against relative rotation. The lower end
between each groove I00 and the groove I01. sub
stantially ?tting both. A plurality of the grooves
I00, and corresponding number oi’ ball I00. are
preferred as the load transmitted is correspond
ingly divided between the balls. A cage I10 is
interposed between the screw I00 and nut I04
load was being transmitted through the gears the
motor would reach such a high speed of rotation
axial displacement, of the nut on the screw re
and is provided with openings therein through
oi’ the screw element I00 is ?xed against relative
which the balls I00 project and which, therefore,
axial movement to an antifriction bearing assem
bly III in turn held against axial movement in ' act to maintain the balls I00 in their proper rela
the lower end of the housing I00 by means or a 10 tive positions with respect to each other angu
larly about the axis of the screw.
cap I02 and screws I00. The bearing assembly
It will be appreciated that rotation of the screw
IOI serves to rotatably support the screw element
I00 will, because of its frictional contact with
I00 in the housing I00.
the balls I00, cause the balls to roll around it and
The screw element I00 is provided with a nut
I04 adapted to travel vertically thereon, the nut 15 the grooves I00 in the nut I04, but at a slower
speed about the axis of the nut than the screw
I04 being provided with a pair of diametrically
itself. The balls in thus rolling will cause rela
oppositely projecting pins I00. The outer end of
tive axial movement between the nut and screw
the arm I32 is bifurcated and receives the nut I04
but at a less e?ective pitch than the pitch of the
therein, the bifurcated end being slotted as at I00
for reception of the pins I00 therein.
20 groove I01. In the particular example given the
screw will turn approximately twelve times to
The screw I00 and nut I04 are of an unusual
move the nut one inch axially thereon. This has
nature any by their use material advantages are
the e?‘ect of increasing the mechanical advan
obtained. both from the standpoint of substan
tage of the device. The connection between the
tially eliminating the loss of‘ power through them
from friction, and from the standpoint of elim 25 screw and nut results in a positive connection
between them as long as the balls I00 are free to
inating the necessity of employing a brake for
roll in the groove I01, and the greater the load
the motor I50. This part of the construction
the more positive the drive.
forms no part of the present invention except in
The efficiency of the screw and nut construc
its combination with shifting mechanism, its
broad application as a power transmitting means 30 tion shown is approximately 98%, or more than
three times that of a conventional screw and nut
forming the subject matter of my copending ap
employing square threads. Thus an electric
plication for Letters Patent of the United States
motor I50 of one-third the horsepower required
for improvements in Mechanical movement, filed
in my former construction may be employed with
June 14, 1945, and serially numbered 599,417,
consequent saving in bulk and cost. There is,
now Patent No. 2,446,393, dated August 3, 1948.
however. an equally important advantage that
In this connection, while the simple screw and
eliminates the second named disadvantage of the
nut construction shown in the application here
screw and nut in my former application, and this
tofore identi?ed and of which the present appli
is in connection with the elimination of the neces
cation forms a continuation in part is operable,
it was found to require an excessively large elec 40 sity of providing a brake on the motor to limit
the axial travel of the nut on the screw.
tric motor I00 because of the high friction loss
With the construction shown and described, it
(approximately ‘10%) in the conventional screw
the balls I00 are prevented from rolling along the
and nut construction employed in the place of
groove I01 at any time, the nut I04 may still be
the screw I00 and nut I04 oi the present appli
cation. Additionally, it was found in my prior 45 rotated but will not travel axially of the screw.
In such case the balls simply travel around their
construction that where the electric motor was
respective grooves I00 and pure rotation, without
operated to shift the shiftable element when no
sults. Advantage is taken of this last fact by
by the time the current was broken through it 50 stopping travel of the balls I00 in the groove I01
when the nut I04 has traveled axially of the
screw I00 in either direction suiiiciently to place
the spring I40 under the desired torsional stress
and in the desired direction. This automatically
the motor I50 or the housing I00, and
jammed. For this reason it was neces 55 stops the travel of the nut I04 at the desired limit
oi’ its movement and although the motor should
provide a brake on the motor to quickly
continue to rotate, because of inertia or other
rotation when the circuit through it was
that the inertia of the motor would cause the nut
to move axially of the screw until the nut would
strike some fixed part as, for instance, the hous
ing for
become
sary to
stop its
broken.
By the use of the screw and nut con
wise, no jamming can occur as the nut rotates
freely under such circumstances.
struction shown in the present application a
The stopping of the travel of the balls I00 in
much smaller electric motor may be used, and 00
the groove I01 may be accomplished by blocking
the expense and complication of a brake for it
the balls directly, or by stopping movement of
is eliminated.
the cage I10. In the particular case shown
Referring now to Fig. 7 it will be noted that the
means comprising pins "I are provided for di
screw I00 has a helical groove I01 therein which
forms the thread thereof and that this groove is 65 rect contact with the endmost ‘balls I00. The
pins I1l are press ?tted in holes formed radially
substantially semi-circular in cross-sectional
in the screw I00 and centrally of the groove I01,
con?guration. In one practical embodiment of
one being provided adjacent each end of the
the invention the screw is one-hall’ inch in di
screw I00 at that point in the length thereof
' ameter with seven threads per inch of length.
The nut I04 has no threads formed in it. In 70 where it is desired to stop the corresponding end
of the nut I04. The pins "I, as brought out in
stead its bore is provided with one or more, pref
Fig. '1, project into the groove I'01 just far enough
erably a plurality of, circumferentialiy and ax
to engage the cooperating ball I00 and prevent
ially spaced annular grooves I00. The grooves
its further travel in the groove I01 in that direc
I00 are of the same cross-sectional con?guration
tion. Engagement of either end ball I00 with its
as the grooves I01, and one ball I 00 is positioned
2,462,779
11
cooperating pin "I, not only prevents further
12
‘ 5 and 6 is that which they assume when the mo
movement of such ball in the groove I61 in the
direction of the pin, but through the cage I10
acts to stop travel of all the balls I69 in the groove
tor I60 has been operated to shift the sleeve 10
from the position illustrated in full lines in Fig.
2 to its opposite position of movement but be
I61 in such direction. Thus the rest of such balls
are stopped indirectly by the pins I1 I,
fore any axial movement of the sleeve 10 has oc
curred. In other words, it may be assumed that
in the position of the parts illustrated in Figs.
Thus by the means described a screw and nut
construction of unusually high efficiency is pro
vided, one in which overrunning of the nut be
yond its desired limit of movement in either di
rection is prevented, and no motor brake is re
quired to stop the motor. As a result a less bulky
4, 5 and 6, the torque is being actively transmit
ted through the transmission mechanism and the
10 friction between the pinion 12 and the pinions
46 is sufficiently great to overcome the force of
the spring I40. It will be observed that in this
and materially less expensive construction than
position of the parts the motor will have moved
that required in my earlier application is pro
nut I64 to its upper position on the screw I60,
vided as well as one which is more e?icient and 15 the ?nger I36 of the arm I30 has pressed the end
free from trouble.
I42 of the spring I40 in a counterclockwise di
With the above described screw and nut con
rection of rotation about the axis of the pin I08,
struction the movement of the nut on the screw
and the spring I40 has been additionally loaded
‘is so free that when the nut is at the upper limit
so that its end I44 bears against the ?nger I04
of its travel on the screw the vibration of the as
tending to move the arm H4 and, therefore, the
sociated vehicle which is transmitted to it has a
member H0, in a counterclockwise direction so
tendency to cause the nut to work down on the
as to shift the outer end of the double armed lever
screw under the force of gravity. To prevent
00 to. the left, as viewed in Fig. 4, and to with
such movement the following described mecha
draw the sleeve 10 to the right, as viewed in
nism, or its equivalent, is preferably provided.
25 Fig. 2, to its position of high speed operation. Un
The screw I60 is provided with a‘ non-circular
der such conditions, as soon as the torque being
head I12 on its upper end, it being shown as hex
transmitted through the pinion ‘I2 is relieved,
agonal in the drawing by way of illustration as
as will occur, for instance, where the operator of
this shape has proven satisfactory in practice.
the vehicle lifts his foot from the accelerator
A vertically directed spring arm I13, shown in 80 pedal, the force of the spring I40 will immediately
perspective in Fig. 8, has an opening in the lower
cause the member I I0 to be rotated in a counter
portion thereof which receives one of the pins
clockwise direction to bring its ?nger I34 into
I66, and bent side ?anges which engage the ad
substantial radial alignment with the ?nger I36
jacent side faces of the nut to prevent its turn
and thereby cause shifting of the sleeve 10 to
ing on the pin. It is confined or anchored in such 35 occur.
,
- ‘position between the nut I64 and the cooperating
If the various parts are in the latter described
arm of the yoke on the outer end of the arm I32.
position and it is desired to return the transmis
Its free end extends upwardly and is bent radi
sion to the position illustrated in Fig. 2, then
ally inwardly of the axis of the nut I64, to a posi
the motor I50 is operated to move the nut I64
tion slightly radially inwardly of the periphery 40 to the lower end of the screw element I00. This
of the head I12 when free therefrom. Its extreme
operation will cause the member H2 to rotate
tip is bent outwardly so as to enable it to ride up
in a clockwise direction of rotation, as viewed in
on the head I12 when coming into engagement
Figs. 5 and 6, at which time the- ?nger I36 will
therewith. The spring arm I13 is of such length
pick up the end I44 of the spring I40 and the
that shortly before the upper ball I69 engages 45 end I42 of the spring I40 will engage the ?nger
its cooperating stop pin III as the nut I64 travels
I64 of the member H0, and as the nut I64 travels
upwardly on the screw I60, the upper free end of
downwardly, the spring I40 will be stressed in
the spring arm engages and rides up on the head
a direction tending to rotate the member IIO
I12, and by the time the upper ball I69 engages
in a clockwise direction of rotation and which
its pin IN to prevent further upward movement 60 movement of the member I I0, and corresponding
of the nut I64 the free end of the spring arm I13
shifting movement of the sleeve 10 will occur
is riding on the periphery of the head I12. Be—.
as the torque on the pinion 12 is relieved suffi
cause the head I12 is of non-circular con?gura
ciently to permit the force of the spring I40 to
tion the pressure of the spring arm I13 upon it
overcome it.
serves as a brake to resiliently hold the nut I64 05
It will be appreciated that by making the spring
against inadvertent turning on the screw under
I40 of sumcient weight or strength. any desired
the conditions above mentioned, but offers no
amount of force may be applied to the sleeve
material resistance to the normal functioning of
10 to urge it in either one direction or the
the screw and nut in their intended manner‘.
other as soon as the torque being transmitted
When the members I I0 and "2 are in a posi 00 through it is reduced sufficiently to permit the
tion in which the arms Ill and I30 of the mem
force of the spring to overcome the friction be
bers Ill and III, respectively, are vertically di
tween the pinlon 12 and the gears 46, and that
rected with respect to the axis of the pin I08 and
this force is instantaneously available the
aligned with each other axially of the pin I08,
moment the torque being transmitted has thus
the spring I40 is in a position of minimum "load 60 been reduced.
ing." The word "minimum" is used as preferably
Mechanism is provided for reversing the direc
even in such case, the spring I40 is so stressed
tion of rotation of the electric motor I50 and for
as to tend to draw the ends I42 and I44 thereof
discontinuing its motion whenever the nut I64
towards each other. In other words, the spring
reaches either one end or the other of its permis
I 40 is "preloaded” to effect this tendency. This 70 sable path of travel on the screw I80. and the
relation of the parts will seldom be realized in
mechanism provided for this purpose will now
actual practice for the reason that the sleeve
be described, having particular reference to Figs.
10 will normally be in either one or the other
1, 3, 5, and 6.
of its limits of movement in an axial direction.
The cover member I06 in vertical alignment
The position of the parts illustrated in Figs. 4, 75 with the axis of the pin I00 and below the
9,402,770
14
oi’ flow of curr t through the armature Illa
that is to be rev read to reverse the direction of
'jecting through it perpendicular to its plane
rotation of the motor I80.
or thickness and insulated from the cover in the
In Fig. 1A the switch_ I88 and spring conductor
manner illustrated in Fig. 3. Above the axis of
element I88 are illustrated in the position shown
the pin I08 a pair or contact pins I82 and I84
in the remaining ?gures oi the drawing. In
also project through the cover I08 and are in
other words, the spring conductor I88 is out of
sulated therefrom in a manner similar. to the
contact with the contact I82 and it is assumed
pin I80. The pins I82 and I84 are horizontally
that the nut I84 has reached the upper limit of
spaced from one another and disposed equally
on opposite sides of a vertical plane including 10 its movement corresponding with such position.
and that the spring "I40 has been stressed to shift
the axis of the ‘pin I80 and, accordingly, the
the sleeve ‘I8 towards its high speed position but
axis of the pin I08. On the‘inside of the cover
the friction existing between the pinion 12 and
I08 a U-haped spring metal conductor element
planet gears 48 is too great at the moment to
I88 is mounted midway between its ends upon- the
pin I80 and projects upwardly therefrom, its 16 permit such shifting movement to occur.
The switch I88 is illustrated as being provided
upper ends being tensioned toward one another
with two switch bars 208 and 208 which in the
so as to constantly tend to contact the inner
position of operation shown serve to conduct elec
ends of the pins I82 and I84.
.
trical current from the battery 202 downwardly
The arm I30 of the member “2 is provided
with an axially parallel and axially outwardly 20 through the armature I80a to the spring con
ductor element I88. If the spring conductor I88
projecting pin I88 thereon, formed from electrical
latter is provided with "a conductor pin I80 pro
was in contact with the contact I82, as would
insulation material and which as perhaps best
be the case when the switch I88 was initially
brought out in Fig. 3 is located between the free
moved to its upper position shown and at which
ends of the spring conductor element I88. The
relation of the parts is such that when the 25 time the nut I84 would be at the upper end of the
screw I80, then the current would ?ow through
member H2 is at either limit of its rotatable
the contact I82 and downwardly through the ?eld
position about the axis of the pin I08 as con
windings I50?) and through the ground to the
trolled by the elecric motor I80 through the screw
negative side of the battery 202. It cannot ?ow
I80, the ping I88 will engage the corresponding
free end of the spring conductor element I88 and 30 through the spring conductor I88 through the
contact I84 under the conditions shown because
press it out of contact with the corresponding
the circuit in this direction is broken through the
pin I82 or I84 as the case may be.
switch I88. If, While the parts are in the posi
It will thus be appreciated that when the
tion shown, the plunger I88 is moved downwardly
nut I84 reaches its limit of movement in either
to cause the bars 208 and 208 to bridge the re
direction on the screw I80 the pin I88 will
maining pair of contacts of the switch I88, then
engage a corresponding free end of the spring
the current from the battery 22 will ?ow through
conductor element I88 and move it out of contact
with the corresponding pin I82 or I84, leaving
the other free end of the spring conductor ele
the switch I88 to the contacts I84, through the
spring conductor I88, contact I80 upwardly
ment I88 in contact with the other pin I82 or 80 through the armature I50a (this being in the re
verse direction from that ?rst explained) and
I84. This breaking of the contact between the
then through the ?eld windings I50b to ground,
spring conductor element I88 and one of the
this reversing the direction of rotation of the mo
pins I82 and I84 is relied upon to break the
tor I50 and causing the nut I84 to travel to the
electrical circuit to the motor I80 when it has
moved the nut I84 to either one or the other 45 opposite end of the screw I80 from the position
shown in Fig. 5,‘ and upon reaching which posi
of its limits of movement on the screw I80.
tion the spring element I88 will be freed of con
The circuit to the electric motor I80 through
tact with the contact I84, thus breaking the cir
the spring conductor I88 above described may
cult to the motor. It will be appreciated that
be controlled by a suitable switch positioned at
a point for convenient operation by the operator 50 upon initial movement of the member H2 in
either direction that end of the conductor spring
of the motor vehicle of which the mechanism
element I88 which has been pressed out of con
forms a part. In Fig. 1 it is shown mounted
tact with its corresponding contact I82 or I84 will
upon the gear shift lever I90 of the associated
be returned to contact therewith, thus condition
motor vehicle by means of a bracket I82 and in
proximate relation with respect to the ball hand 55 ing the corresponding circuit for operation by
lmovement of the switch I88 to its opposite posi
grip I84 thereof. While obviously any suitable
tion of operation.
or conventional type of switch may be employed.
It will thus be appreciated that the operator
that shown for the purpose of explanation at
of the vehicle to which the present invention is
I98 is of the push-pull type having an operating
knob I98. The switch I88 is connected by a lead 60 applied, by either pulling or pushing the knob
I88 of the switch I98 may pre-select the shiftab‘e
200 to a storage battery 202, a key operated switch
position of the transmission. If the vehicle is
204. and which may be the conventional ignition
not in operation and no torque is being trans
switch. preferably being interposed in the lead
mitted through the sun gear ‘I2, then the sleeve
200. The negative side of the battery 202 is
85 ‘I0 will be shifted immediately upon operation of
grounded as indicated.
the control knob I88 for the switch I98. On the
The electric motor I50 may be of a. series type
other hand as above explained, if the vehicle is
in which the direction of flow of electrical current
in operation and a material amount of torque
through either the ?eld or the armature is re-.
is being transmitted through the sun gear ‘I2.
versed to reverse the direction of rotation thereof.
The wiring diagram for reversing the direction of 70 then when the operator operates the switch I88 to
pre-select a shiftable position of the sleeve ‘I0.
rotation of the motor is shown in Fig. 1A in which
the motor I50 will operate to stress the spring
the switch I98 is shown diagrammatically and
I40 in a. direction corresponding with the desired
the motor I50 is illustrated diagrammatically
direction of shiftable movement or the sleeve ‘I0
by the armature I50a and the ?eld I50b. In
this case it is assumed that it is the direction 78 and as soon as the operator takes his foot oil of
2,462,779
the accelerator of the vehicle and the torque be
ing transmitted through the sun gear 12 is thus
relieved, the moment it is relieved su-f?ciently to
permit the spring "ii to overcome the friction
exerted between the teeth of the sun gear 12 and
the planet gears 46 the sleeve ‘I0 and sun gear
will be shifted to the selected position. and such
shifting will occur in a quick and positive man
ner.
16
Upon return of the sleeve ‘ill to the position shown
in the drawings the spring ?nger 232 will again
come in contact with the member i I 0 and again _
energize the solenoid 226 to return it to the posi
tion ?rst described. Thus it will be appreciated
that it is the movement of the member llll
coincidentally with the shifting of. the sleeve 10
that controls the shiftable position of the speed
ometer‘change speed mechanism 2lil, and not the
operation of the switch I", this being, of course,
preferable inasmuch as shifting of the switch I"
Inasmuch as two speed rear axles of the type 'in
illustrated in Fig. 2 are employed in conjunction
with motor vehicles having a conventional trans
from one position to another is not usually ac
mission mounted on the rear end of the engine,
companied by an immediate shifting of the sleeve
and inasmuch as the speedometer for the vehicle
‘Ill for the reasons previously described.
is conveniently driven from the main transmis
In Figs. 9 to 13, inclusive, a structure is shown
sion shaft, it will be appreciated that in order
which is identical to the structure shown and
for the speedometer to read correctly where a
heretofore described except for a variation in the
two speed rear axle is employed it is also neces
form of the torsion spring unit employed for
sary to have a change speed mechanism in the
transmitting the torque created by movement of
drive between the main transmission shaft and 20 the nut I64 on the screw I60 to the double armed
the speedometer. This is conventional practice
lever Iii. Accordingly, parts identical to those
and in Fig. 1 the speedometer change speed gear
already described are indicated by the same
ing is illustrated generally at 2"]. It is provided
numerals in Figs 9 to 13, inclusive, and a descrip
with an operating shaft 2| 2 to which is ?xed an
tion only of the changed parts will be necessary
operating arm 2“ connected by a link 2l6 to the
to explain the construction of the same, the
armature 2i8 of a solenoid 220 mounted thereon.
operation of the device being otherwise identical.
The solenoid 220 is of a conventional type in
Referring to Figs. 9 to 13, inclusive, and partic
which the armature is spring pressed in one
ularly to Fig. 9 it will be noted that the pin "Iii
direction and electrically operated in the opposite
in this case is surrounded by a sleeve or bushing
direction against the force of such spring means. 30 320. A sleeve-like member 3 ill, corresponding to
The solenoid 220 is connected with the positive
the member lit first described, rotatably sur
side of the battery 202 through the switch 224
rounds the sleeve or bushing 300. A second sleeve
and the opposite side is conected through the
3l2 corresponding in function to the member I I2
mechanism of the present invention in such a
first described in turn rotatably surrounds the
manner that when the sleeve 10' is shifted to one 35 member 3 iii. The member 3 i ll is provided with an
limit of its shiftable position the solenoid 220 is
arm 3“ integral therewith and corresponding
actuated to place the speedometer change speed
with the arm H4 on the member H0, and
mechanism 2") in one of its shiftable positions
similarly is provided with a pin 3i6 corresponding
and when the sleeve ‘III is in the other of its shift
with the pin H6 ?rst described and in turn carry
able positions the speedometer change mecha
ing the ball “8.
nism 2N is shifted to its opposite position corre
The member 3i: is provided at its axially outer
sponding with the shifted position of the sleeve
end with an arm 332, corresponding with the arm
10. This last is accomplished in the following
I30 ?rst described, integral therewith and opera
manner.
tively interconnected with the nut I64 in the same
As best brought out in Figs. 5 and 6 a spring
manner as in the ?rst described construction. A
contact arm 230 is mounted within the housing
preferably preloaded torsion spring 340 corres
lilil and in wiping relation with respect to the
ponding with the torsion spring I40 of the first
?ange formed on the axially inner end of the
described construction, surrounds the member
member ill. The contact finger I30 is secured in
3i2. In this case the free ends of the spring 340
place by means of a. screw 232 insulated from the 50 instead of being turned outwardly as in the ?rst
housing Hill in the manner illustrated in Fig. 5
described construction are turned inwardly as at
and the screw 232 is connected by the lead 234
242 and 344, respectively, thus corresponding to
with the solenoid 220. Inasmuch as the housing
the ends I42 and I44 of the ?rst described con
M0 is grounded and the member H0 in electrical
struction.
contact therewith, when the spring ?nger‘ 233
In this case the members 3“ and M2 in line
bears against the'member iiil the solenoid 220
with the opposite bent ends 342 and 344 of the
is energized. This is the relation of the parts
spring 340 are both slotted in a plane perpen
shown in the drawings, and when the two speed
dicular to the axis of the members 3|! and "2
rear axle mechanism is in the low gear also shown.
over an angular distance su?lcient for the re
The said ?ange on the member llll against 00 quired movements between the two members but
which the spring ?nger 23B rides is provided in
in the case shown slightly in excess of 180". In
its periphery with a notch 236, perhaps best
other words the member 3| 2 is provided with such
brought out in Fig. 4, which when the member
a slot, indicated at 350, at a point axially thereof
H0 is in a position corresponding with the high
in line with the end 344 of the spring 340 and the
speed position of the sleeve ‘Ill, that is in which its 65 member 3“! is provided with a radially aligned
arm H4 is rotated in a counterclockwise direc
slot 352. Similarly the member 3l2 axially
tion from the position illustrated in Figs. 5 and 6
thereof in radial alignment with the end 342 is
to a position axially aligned with the arm [30 of
provided with such a slot 354 and the member 3 I ll
the member H2, becomes radially aligned with
with a radially aligned such slot 356. The end 342
the free wiping end of the spring 230 and severs 70 of the spring 348 is of such length radially of the
the contact between the spring arm 220 and the
pin I08 as to extend into the slots 354 and 356
member illi. thus breaking the circuit through . su?iciently to engage both members 3N and 3|!
the solenoid 226 and permitting the spring means
and similarly the end 344 is of such length radially
thereof to shift the speedometer change speed
device 2M to its opposite position of operation. 76 of the pin Ill! to extend into the slots 350 and 352
sumciently to engage both members iii? and H2.
2,402,779
17
The member H0 centrally between its opposite
18
against radially outward displacement under
to the other member, and to exert a. correspond
ingly directed force on the other member.
Having thus described my invention, what I
claim by Letters Patent is:
1. In combination with a part to be shifted be
tween two limits of movement, a pair of relatively
rotatable members each mounted for rotation
stress.
about a common axis, a torsion spring intercon
ends has its bore relieved as at "I and the ends
342 and 3“ project into the relief “I and are
preferably bent in the direction shown so as to
provide hooked ends which, in engaging the inner
member Il?, tend to hold the ends “2 and 3“
E
When the spring “ii is free of stress other
necting said members operative to exert a force
than assembly preload then the parts Ill and iii
to rotate one of said members in either direction
assume the normal position illustrated in Fig. 11,
of rotation upon rotation 01' the other of said
that is the ends of all of the slots 35B, 352, 354 and
members in said direction oi.’ rotation, said one 61’
358 are aligned with the corresponding ends 01'
said members being operatively connected to said
each other and the spring ends “2 and 8" seat
part to apply a shifting force thereto, electrically
against the corresponding ends of the corre ll operated means interconnected with said other of
sponding slots. This relationship of parts takes
said members and operative upon energization to
place after completion of each shift and is the
rotate said other of said members from either
starting point of any new shii't. This relation
limit of its rotatable position to its opposite limit
ship, normally, does not take place except at the
of rotatable position, means operable upon said
extreme strokes of the nut, the showing in Fig.
other 01' said members re'aching either limit of
11 not being angularly correct in this respect but
its rotatable position for de-energizing said elec
is shown merely to illustrate the relative positions
trically operated means, said interconnection in
cluding a rotatable screw provided with a helical
of the sleeves under minimum spring tension. If
thread, a nut surrounding said screw and having
the nut t" and the‘sleeve ‘ID are in the positions
a circumferentially extending annular groove in
illustrated in the ?rst described ?gures, then they
assume the position illustrated in Fig. 13. that is
the bore thereof, a ball received .between said
groove and the groove formed between the
the outer member 3i! has been rotated to the ex
threads of said screw, and means for limiting
treme limit of its movement in a counterclockwise
travel of said ball in the last mentioned groove at
direction under the influence of the screw I80 and
both limits of the desired travel of said nut ax
nut I“, the inner member Sl? is at the extreme
ially of said screw without limiting its travel in
limit 01' its movement in a clockwise direction and
is being held in such position ‘by the friction ex
the ?rst mentioned groove.
isting between the teeth of the pinions 46 and
2. In combination with a part to be shifted be
12 because of the transmission of torque between
tween two limits of movement, an arm operatively
these members, the spring 340 being stressed so 85 connected to said part for e?'ecting shifting
that immediately upon release of the torque re
movement thereof, a nut operatively connected
to said arm, a vertically directed screw projecting
ferred to and, therefore, the friction between the
through said nut, a reversible motor operatively
pinions 346 and 312, the inner member ill! will
connected to said screw operable to rotate said
be rotated in a counterclockwise direction to the
same relative position of rotation as the outer
screw in either direction of rotation, said screw
having a helical groove therein, said nut having
member 3H, at which time the members will
assume the relation shown in Fig. 11 except that
an annular groove in the bore thereof, a ball
interposed between said grooves and substantially
the members llll and 3!! will be rotated counter
clockwise i'rom the position shown in Fig. ‘11 to a
?tting the same, means limiting travel of said
ball between predetermined points in the length
position corresponding with the outer members
III in Fig. 13.
of the ?rst mentioned groove without limiting its
Fig. 12 illustrates the ‘position oi’ the parts
travel in the second mentioned groove, and means
shown in Fig. 13 in the extreme opposite position.
co-operating between said nut and screw when
said ball has reached its upper limit of its travel
that is, where the inner member Sill has been
shifted to a position in which the sleeve 10 is at 50 in said groove in said screw preventing free rela
the opposite end oi‘ its limit oi’ axial movement
tive rotational movement between said nut and
and the outer sleeve 3i2 has been rotated in a
clockwise direction by movement of the nut I64
to the lower end of the screw I" and before the
screw.
3.'In combination with a part to be shifted
between two limits of movement, an arm opera
friction between the pinions l8 and 12 has been 55 tively connected to said part for e?‘ecting shift
ing movement thereof, a nut operatively con
released suiliciently to permit the force of the
nected to said arm, a vertically directed screw
spring to rotate the inner member 3lll to a posi
projecting through said nut, a reversible motor
tion corresponding with the outer member 3l2.
operatively connected to said screw operable to
It is, of course, understood that when such fric
tion is relieved the stress of the spring Nil will 00 rotate said screw in either direction of rotation,
said‘screw having a helical groove therein, said
rotate the inner member m in a clockwise direc
nut having an annular groove in the bore there
tion as viewed in Fig. 12 until the parts are in the
of, a ball interposed between said grooves and
same relatively aligned condition as illustrated in
substantially ?tting the same, means limiting
Fig. 11 except rotated therefrom in a clockwise
travel of said ball between predetermined points
direction to correspond with the position of the
in the length of the ?rst mentioned groove with
outer member 3l2 in Fig. 12.
out limiting its travel in the second mentioned
The spring actuating units, that is the mem
groove, means co-operating between said nut and
bers H0 and “2 with their corresponding spring
screw when said ball has reached its upper limit
H0, or the members 3H] and 3l2 with their cor
of its travel in said groove in said screw prevent
responding spring 340 are, of course, applicable to
ing free relative rotational movement between
other uses than those specifically shown. Their
said nut and screw comprising a ncncircular por
importance lies in the ability to turn one member
tion fixed with respect to said screw, and a re
in either direction, and to amounts of angular
silient ?nger carried by said nut and movable
rotation up to and in excess of 180° with respect
into stressed engagement with said noncircular
2,402,779
19
portion when said ball approaches said upper‘
20
spring means a turning force on the ?rst-men
tioned rotatable member in a corresponding di
limit.
4. In combination, a pair oir relatively rotat
rection without necessitating simultaneous rota,
able sleeves arranged in telescoping relation with
tion of said ?rst-mentioned rotatable member,
respect to each other, each 01' said sleeves hav
and power operated means for turning said sec
ing a pair of axially spaced slots therein each
end-mentioned rotatable member in either direc
arranged in a plane substantially perpendicular
tion of rotation independently oi’ rotatable move
to the axis of said sleeve, said slots in one of said
ment of said first-mentioned rotatable member,
sleeves being radially aligned with the slots in
whereby a turning iorce may be built up on said
the other of said sleeves, a torsion spring substan
?rst-mentioned rotatable member independently
tially concentric with the axes of said sleeves,
of movement of said shiitable member, thereby
a free end portion on said spring projecting
to eifect shifting oi’ said shiftable member imme
through one set of radially aligned slots of both
diately upon the cessation of the transmission 01'
oi’ said members, and a second free end portion
material amounts of power therethrough.
on said spring extending through the other set 16
8. In combination with a power transmitting
01' said radially aligned slots of both said mem
mechanism including a member shiftable between
bars.
two operative positions and through which power
5. In combination, a pair of relatively rotatable
is transmitted when in either of said positions,
members arranged in telescoping relation with
said member being so constructed and arranged
respect to each other,_each of said members have
and so cooperating with parts drivingly engaged
ing a pair of slots therein spaced from one an
thereby in either of said operative positions as
other axially or said member, and each ‘disposed
to be substantially locked against shiftlng‘move
substantially in a plane perpendicular to the axes
ment while a material amount of power is being
of said members, the axial spacing oi’ said slots in
transmitted therethrough, means for shifting
one of said members being substantially the same
said shlitable member including a rotatable mem
as the axial spacing of said slots in the other of
ber interconnected thereto for simultaneous
said members and corresponding slots in said
movement therewith, a second rotatable member
members being arranged in radial alignment with
concentric with the ?rst-mentioned rotatable
each other, said slots extending through at least
member and rotatable independently thereof,
180° about the axes of said members, a torsion 30 torsion spring means interconnecting said rotat
spring concentric with said members and having
able members so constructed and arranged that
opposite free end portions, one of said free end
rotation of the second-mentioned rotatable mem
portions projecting through corresponding slots
ber in either direction of rotation applies through
of both of said members and the other of said
said spring means a turning force on the ?rst
free end portions projecting through the remain
ing slots 01’ both of said members.
6. Mechanism for shifting a power transmitting
element between two power transmitting posi
35 mentioned rotatable member in a corresponding
direction without necessitating simultaneous r0
tation of said ?rst-mentioned rotatable member,
and power operated means for turning said sec
tions comprising a pair of axially aligned rela
ond-mentioned rotatable member in either direc
tively rotatable members, means coupling one of 40 tion of rotation independently of rotatable move
the members to the power transmitting element,
ment of said ?rst-mentioned rotatable member
torsion spring means operatively interconnecting
comprising a nut member operatively connected
said members operable to transmit a turning force
to the second-mentioned rotatable member in
from the other of said members to said one of
eccentric relation with respect to the axis of rota
said members when said other 0! said members is
tion thereof, a screw member operatively engag
rotated in either direction 01’ rotation without a
ing said nut member, and a reversible electric
corresponding rotation movement of‘s‘aid one of
motor drivingly connected to said screw member,
said members, a power screw having a part con
whereby a turning force may be built up on said
nected to said other of said members operative
?rst-mentioned rotatable member independently
to rotate said other of said members to build up a
of movement of said shiftable member, thereby
turning force on said one of said members opera
to e?’ect shifting of said shii'table member imme
tive to shift the power transmitting element upon
diately upon the cessation of the transmission of
the cessation of the transmission of a material
material amounts of power therethrough.
amount or power therethrough, and a motor con
9. In combination with a power transmitting
nected to another part of the screw for effecting 55
mechanism including a member shiitable between
rotation thereof in either direction.
two operative positions and through which power
7. In combination with a power transmitting
is transmitted when in either of said positions.
mechanism including a member shiftable between
said member being so constructed and arranged
two operative positions and through which power
and so cooperating with parts drivingly engaged
is transmitted when in either of said positions.
thereby in either of said operative positions as
said member being so constructed and arranged
to be substantially locked against shifting move
and so cooperating with parts drivingly engaged
ment while a material amount of power is being
thereby in either of said operative positions as to
transmitted therethrough, means for shifting said
be substantially locked against shifting movement
shii'table member including a rotatable member
while a material amount of power is being trans
interconnected thereto for simultaneous move
mitted therethrough, means for shifting said
ment therewith, a second rotatable member con
shiftable member including a, rotatable member
centric with the ?rst-mentioned rotatable mem
interconnected thereto for simultaneous move
ber and rotatable independently thereof, torsion
ment therewith, a second rotatable member con- '
spring means interconnecting said rotatable
centric with the ?rst-mentioned rotatable mem 70 members so constructed and arranged that rota
ber and rotatable independently thereof, torsion
tion of the second-mentioned rotatable member
spring means interconnecting said rotatable
members so constructed and arranged that rota
tion of the second-mentioned rotatable member
in either direction of rotation applies through
said spring means a turning force on the ?rst
mentioned rotatable member in a corresponding
in either direction of rotation applies through said 75 direction without necessitating simultaneous ro
2,402,779
21
'tation of said ?rst-mentioned rotatable member,
and power operated means for turning said
second~mentioned rotatable member in either
' direction of rotation independently of rotatable
movement of said ?rst-mentioned rotatable mem
22
thereby in either of said operative positions as to
be substantially locked against shifting movement
while a material amount of power is being trans
mitted therethrough, means for shifting said
shiftable member including a rotatable member
interconnected thereto for simultaneous move
ber comprising an arm ?xed with respect to said
ment therewith, a second rotatable member con
second-mentioned rotatable member, a nut mem
centric with the ?rst-mentioned rotatable mem
ber non-rotatably associated with said arm, a
ber and rotatable independently thereof, torsion
screw member projecting through said nut mem
ber, said nut member having a circumferentially 10 spring means interconnecting said rotatable
members so constructed and arranged that rota
arranged groove in the bore thereof, a ball re
tion of the second-mentioned rotatable member
ceived simultaneously in said groove and in the
in either direction of rotation applies through said
space between the threads of said screw, and a
spring means a turning force on the ?rst-men
reversible electric motor drivingly connected to
said screw for effecting rotation thereof in either 15 tioned rotatable member in a corresponding direc
tion without necessitating simultaneous rotation
direction, whereby a turning force may be built
of said ?rst-mentioned rotatable member, and
up on said ?rst-mentioned rotatable member in
power operated means for turning said second
dependently of movement of said shiftable memmentioned rotatable member in either direction of
ber, thereby to effect shifting of said shiftable
member immediately upon the cessation of the 20 rotation independently of rotatable movement of
said ?rst-mentioned rotatable member comprising
transmission of material amounts of power
an arm ?xed with respect to said second-men
therethrough.
tioned rotatable member, a nut member carried
10. In combination with a power transmitting
by said arm in eccentric relation with respect to
mechanism including a member shif table between
the axis of rotation of said second-mentioned ro
two operative positions and through which power
tatable member, said nut member having a pin
is transmitted when in either of said positions,
rality of axially spaced, circumierentially directed
said member being so constructed and arranged
grooves in the bore thereof, a screw projecting
and so cooperating with parts drivingly engaged
through said bore of said nut member, a bail re
thereby in either of said operative positions as to
be substantially locked against shifting move 30 ceived in each of said grooves and simultaneously
received in the space between the threads of said
ment while a material amount of power is being
nut member, a cage interposed between said screw
transmitted therethrough, means for shifting
and the bore of said nut member operatively en
said shiftable member including a rotatable mem
gaging said balls to maintain them in predeter
ber interconnected thereto for simultaneous
movement therewith, a second rotatable member
concentric with the first-mentioned rotatable
member and rotatable independently thereof,
torsion spring means interconnecting said rotat
able members so constructed and arranged that
mined angular relation with respect to each other,
and power-operated means for turning said
sion of material amounts of power therethrough.
second-mentioned rotatable member in either
direction of rotation, independently of rotatable
movement of said ?rst-mentioned rotatable mem
12. In combination with a power transmittin:v
mechanism including a member shiftable between
‘means ?xed axially with respect to said screw op
erative to limit movement of said balls axially of
said screw between predetermined limits without
limiting their travel in said grooves, and a re
rotation of the second-mentioned rotatable mem 40 versible electric motor drivingly connected to said
screw. whereby a turning force may be built up on
ber in either direction of rotation applies through
said ?rst-mentioned rotatable member, independ
said spring means a turning force on the ?rst
ently of movement of said shiitable member.
mentioned rotatable member in a corresponding
thereby to e?ect shifting of said shiftable member
direction without necessitating simultaneous ro
immediately upon the cessation of the transmis
tation of said ?rst-mentioned rotatable member,
two operative positions and through which‘ power
is transmitted when in either of said positions.
said member being so constructed and arranged
and so cooperating with parts drivinglv engaged
thereby in either of said operative positions as to
be substantially locked against shifting move
ber comprising an arm ?xed with respect to said
second-mentioned rotatable member, a nut mem
ber operatlvely associated with said arm, a screw
member projecting through said nut member, said
nut member having a circumferentlally arranged
groove in the bore thereof, and a bail received
simultaneously in said groove and in the space
. ment while a material amount of power is being
transmitted therethrough. means for shifting said
sh‘ftable member including a rotatable member
interconnected thereto for simultaneous move
between the threads of said screw, means ?xed
with respect to said screw for limiting the move
ment of said ball in said space between the
threads of said screw between predetermined
limits axially of said screw, and a reversible elec
tric motor drivingly connected to said screw for
ment therewith. a second rotatable member con
centric with the first-mentioned rotatable mem
her and rotatable independently thereof. torsion
spring means interconnecting said rotatable mem
bers so constructed and arranged that rotation
of the second-mentioned rotatable member in
either direction of rotation applies through said
effecting rotation thereof in either direction
whereby a turning force may be built up on said
?rst-mentioned rotatable member independently
of movement of said shiftabie member, thereby
to effect shifting of said shiftable member imme
diately upon the cessation of the transmission of
material amounts of power therethrough.
11. In combination with a power transmitting
mechanism including a member shiftable between
spring means a turning force on the ?rst-men
Honed rotatable member in a corresponding direc
tion without necessitatirvir simultaneous rotation
of said ?rst-mentioned rotatable member. and
u power operated means for turningr said second
two operative positions and through which power‘
is transmitted when in either of said positions.
said member being so constructed and arranged
and so cooperating with parts drivingly engaged 75
mentioned rotatable member in either direction of
rotation independently of rotatable movement of
said ?rst-mentioned rotatable member compris
ing an arm ?xed with respect to said second-men
tioned rotatable member, a nut member carried by
2,400,770
24
said am in eccentric relation with respect to the
axis of rotation oi’ said second-mentioned rotata
ble member, said nut member having a plurality
between said nut member and said screw when
said balls have reached the upper limit of their
travel between the threads of said screw Prevent
of axially spaced, circumierentially directed
ing i‘ree relative rotational movement between
grooves in the bore thereof, a generally vertically
directed screw projecting through said bore of said
said nut member and screw comprising a non
circular portion ?xed with respect to said screw
nut member, a ball received in each of said grooves
and a resilient ?nger carried by said nut and
and simultaneously received in the space between
movable into stressed engagement with said non
the threads of said nut member, a cage interposed
circular portion when said balls approach said
between said screw and the bore of said nut mem 10 upper limit, and irreversible electric motor driv
ber operatively engaging said balls to maintain
them in predetermined angular relation with re
spect to each other, means ?xed axially with re
spect to said screw operative to limit movement
of said balls axially of said screw between prede 15
termined limits without limiting their travel in
said grooves, means cooperating between said nut
ingly connected to said screw, whereby a turn
ing force may be built up on said ?rst mentioned
rotatable member independently of movement 01'
said shiitable member, thereby to e?ect shifting
of said shii’table member immediately upon the
cessation of the transmission of material amounts
of power therethrough.
member and said screw when said balls have
14. In combination with a power transmitting
reached the upper limit of their travel between the
mechanism including a member shii'table between
threads of said screw preventing free relative rota 20 two operative positions and through which power
tional movement between said nut member and
is transmitted when in either of said positions,
screw, and a reversible electric motor drivingly
said member being so constructed and arranged
connected to said screw, whereby a turning force
and so cooperating with parts drivingly engaged
may be built up on said ?rst-mentioned rotatable
thereby in either of said operative positions as to
member independently of movement of said shift
be substantially locked against shitting movement
able member, thereby to e?’ect shifting of said
while a material amount of poweris being trans
shii'tabie member immediately upon the cessation
mitted therethrough. means for shifting said
of the transmission of material amounts of power
shittable member including a rotatable member
therethrough.
‘ interconnected thereto for simultaneous move
13. In combination with a power transmitting 80 ment therewith, a second rotatable member con
mechanism including a member shiftable between
centric with the ?rst mentioned rotatable mem
two operative positions and through which power
ber and rotatable independently thereof, torsion
is transmitted when in either of said positions,
spring means interconnecting said rotatable‘
said member being so constructed and arranged
members so constructed and arranged that rota
and so cooperating with parts drivingly engaged 35 tion of the second mentioned rotatable member
in either direction of rotation applies through
thereby in either of said operative positions as to
be substantially locked against shifting move
ment while a material amount of power is being
said spring means a turning force on the ?rst
mentioned rotatable member in a corresponding
transmitted therethrough, means for shifting said
direction without necessitating simultaneous ro
shiitable member including a rotatable member 40 tation of said first mentioned rotatable member,
interconnected thereto for simultaneous move
and power operated means for turning said sec
ment therewith, a second rotatable member con
ond mentioned rotatable member in either direc
centric with the first mentioned rotatable mem
tion of rotation independently of rotatable move
ber and rotatable independently thereof, torsion
ment of said ?rst mentioned rotatable member
46
spring means interconnecting said rotatable
comprising a nut member operatively connected
members so constructed and arranged that rota
to the second mentioned rotatable member in ec
tion or the second mentioned rotatable member
centric relation with respect to the axis 0! rota
in either direction of rotation applies through
tion thereof, a screw member operatively en
said spring means a turning force on the ?rst
gaging said nut member, and a reversible electric
50
mentioned rotatable member in a corresponding
motor drivingly connected to said screw member,
direction without necessitating simultaneous ro
control means for said motor including a switch
tation of said first mentioned rotatable member,
operable to energize said motor and to determine
and power operated means for turning said second
the direction of rotation thereof, and means con
mentioned rotatable member in either direction
trolled by the rotational movement of said other
of rotation independently of rotatable movement
of said members for deenerglzing said motor when
of said first mentioned rotatable member com
said other of said members has reached either
prising an arm fixed with respect to said second
limit of its rotatable position.
mentioned rotatable member, a nut member car
15, In combination with a power transmitting
ried by said arm in eccentric relation with respect
mechanism including a member shiitable between
to the axis of rotation of said second mentioned 60 two operative positions and through which power
rotatable member, said nut member having a
is transmitted when in either of said positions,
plurality of axially spaced, circumferentially di
said member being so constructed and arranged
rected grooves in the bore thereof, a generally
and so cooperating with parts drivingly engaged
vertically directed screw projecting through said
thereby in either of said operative positions as to
bore of said out member, a ball received in each
be substantially locked against shifting movement
of said grooves and simultaneously received in the
while a material amount 0! power is being trans
space between the threads of said nut member, a
mitted therethrough, means for shifting said
cage interposed between said screw and the bore
shiftable member including a rotatable member
of said nut member operatively engaging said balls
interconnected thereto for simultaneous move
to maintain them in predetermined angular rela 70 ment therewith, a second rotatable member con
tion with respect to each other, means ?xed
centric with the ?rst mentioned rotatable mem
axially with respect to said screw operative to
ber and rotatable independently thereof, torsion
limit movement of said balls axially of said screw
‘spring means interconnecting said rotatable
between predetermined limits without limiting
members so constructed and arranged that rota
their travel in said grooves, means cooperating 75 tion oi’ the second mentioned rotatable member
2,402,779
25
26
in either direction of rotation applies through
able ‘mating toothed member adapted for move
said spring means a turning force on the ?rst
mentioned rotatable member in a corresponding
direction without necessitating simultaneous ro
menll into and out of power transmitting relation
to the ?rst member, a movable operating element
for moving said last' member into and out of
power transmitting relation to said first member,
a driving element movable relative to the operat
ing element, a spring connecting said elements
tation of said ?rst mentioned rotatable member,
and power operated means for turning said sec
ond mentioned rotatable member in either direc
tion of rotation independently of rotatable move
ment of said ?rst mentioned rotatable member
comprising a nut member operatively connected
to the second mentioned rotatable member in ec~
centric relation with respect to the axis of rota
tion thereof, a screw member operatively engag
ing said nut member, and a reversible electric
motor drivingly connected to said screw member,
switch means electrically connected with said
motor operable to energize said motor to rotate
in either direction oi rotation, means in the elec
trical connection between said switch means and
said motor operable to open that circuit to the
said motor controlling the direction of rotation in
one direction when said other of said parts has
reached one limit oi its rotatable position and to
open that circuit controlling the direction of rota
tion of said motor in the opposite direction when
said other of said members has reached its limit
of rotation in the opposite direction, and means
for exerting a force on said operating element in
a direction tending to cause said mating member
to move out of power transmitting relation to
the other member when the operating element
is moved in one direction, said spring being
capable when distorted by displacement of the
driving member in said one direction of storing
suiiicient energy to shift said mating memberout
of power transmitting relation when the load
transmitted through said mechanism falls below
a given value, electrical power operating means,
and power transmitting means operatively con
nected to said electrical power operating means
for moving said driving element in said one di
rection, said power transmitting means includ
ing means for holding said driving member in
displaced position after said electrical power op
erating means is deenergized.
18. In a geared power transmitting’ mechanism,
a toothed power transmitting member, a shift
carried by said other of said members operatively
able mating toothed member adapted for move
ment into and out of power transmitting rela
that circuit for said motor which is energized to 30 tion to the ?rst member, a movable operating
rotate said motor in a direction of rotation as
element for moving said last member into and out
of power transmitting relation to said ?rst mem
determined by said switch means.
16. In combination with a power transmitting
her, a driving element movable relative to the
mechanism including a member shiftable between
operating element, a spring connecting said
two operative positions and through which power
elements for exerting a force on said operating
is transmitted when in either of said positions,
element in a direction tending to cause said
said member being so constructed and arranged
mating member to move out of power trans
and so cooperating with parts drivingly engaged
mitting relation to the other member when the
whereby in either of said operative positions as
operating element is moved in one direction, said
to be substantially locked against shifting move
spring being capable when distorted by displace
ment while a material amount oir power is being
ment of the driving member in said one direc
transmitted therethrough, means for shifting
tion of storing su?lcient energy to shift said
said shiftable member including a pair of rela
mating member out of power transmitting rela
iively rotatable sleeves arranged in telescoping
tion when the load transmitted through said
relation with respect to each other, each of said
mechanism falls below a given value, electrical
sleeves having a pair of axially spaced slots
power operating means, and power transmitting
therein each arranged in a plane substantially
means operatively connected to said electrical
perpendicular to the axis of said sleeve, said slots
power operating means for moving said driving
in one of said sleeves being radially aligned with
element in said one direction, said power trans
the slots in the other of said sleeves, a torsion 50 mitting means including reversible screw means
spring substantially concentric with the axes of
acting to hold said driving member in displaced
said sleeves, a free end portion on said spring
position after said electrical power operating
projecting through one set of radially aligned
means is deenergized.
slots of both of said members, a second free end
19. In a geared power transmitting mechanism,
portion on said spring extending through the 55 a pair of toothed load-carrying members, a shift
other set of said radially aligned slots of both
able mating toothed member adapted for move
said members, and power operated means for
ment into and out of power transmitting relation
turning said second mentioned rotatable member
to one or the other of said pair‘of, members by
in either direction of rotation independently'of
movement in opposite directions, a movable op
rotatable movement of said ?rst mentioned ro
erating element for moving said shiftable mem
tatable member comprising a nut member op
ber into and out of power transmitting relation
eratively connected to the second mentioned ro
to said pair of members, a driving element mov
tatable member in eccentric relation with re—
able relative to the operating element, a spring
spect to the axis of rotation thereof, a screw
connecting said elements for exerting a force on
member operatively engaging said nut member, 65 said operating element in one direction when the
and a reversible electric motor drivingly con
driving element is moved in one direction and in
nected to said screw member, whereby a turning
the opposite direction when the operating ele
force may be built up on said ?rst mentioned
ment is moved in the opposite direction, said
rotatable member independently of movement
spring being capable when distorted by displace
of said shiftable member, thereby to effect shift 79 ment of the driving member in either direction
associated with the last-mentioned means to open
ing of said shiftable member immediately upon
the cessation of the transmission of material
amounts of power therethrough.
17. In a geared power transmitting mechanism,
a toothed power transmitting member, a shift 75
of storing sufficient energy to shift said mating
member out of power transmitting relation when
the load transmitted through said mechanism
falls below a given value, reversible electrical
motor means, and power transmitting means
2,4:09379
7
operatively connected to said electrical motqr
means for moving said drlvins element to eilect
distortion of said spring means, said power trans
mitting means including reversible screw means
acting to hold said driving member in displaced
position after said electrical power operating
means is deenergiaed.
20. In a geared power transmitting mechanism,
28
a given value, electrical power operating‘ means,
means for energizing said electrical power op
erating means, automatic means for deenergiz
ing said power operated means when the driving
member is displaced to the desired degree, and
power transmitting means operatively connected
to said electrical power operating means tor
moving said driving element in said one direction,
said power transmitting means including m ans
a toothed power transmitting member, a shift
for holding said driving member in displ ‘ed
able mating toothed member adapted for move
position after said electrical power opera ,
ment into and out of power transmitting rela
means is deenergized.
'
tion to the ?rst member, a movable operating ele
ROBERT C. RUSSE
ment for moving said last member into and out
of power transmitting relation to said first mem
REFERENCES CITED l
ber, a driving element movable relative to the 15
The following references are of record in the
operating element, a spring connecting said ele
ments for exerting a force on said operating ele
tile of this patent:
ment in a direction tending to cause said mating
UNITED STATES PATENTS
member to move out of power transmitting rela
Name
Date
tion to the other member when the operating ele 20 Number
1,748,509
Forman __- . ------ __ Feb. 25, 1930
ment is moved in one direction. said spring be
ing capable when distorted by displacement or
the driving member in said one direction or stor
ing suf?cient energy to shift said mating member
' out of power transmitting relation when the load 25
transmitted through said mechanism tails below
2,001,337
2,136,023
2,180,287
2,203,057
2,402,343
Wiedmaier _______ __ May 14,
Russell ___________ __ Nov. 8,
Zwack‘ ___________ __ Nov, 14,
Moore ____________ __ June 4,
Price ___________ __ June 18,
1935
1038
1939
1940
1916
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