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Sept 2, 3947.
‘
c. E; BUERKI ETAL
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ROTARY
Filed Dec. 10, 1945
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2,426,667‘ '
SNAP ACTION MECHANISM
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Patented Sept. v2, 1947
2,426,667
UNITED STATES PATENT OFFICE
2,426,667
ROTARY'SNAP ACTION MECHANISM.
Christian E. Buerki and
Harold L. Mekelburg,N
Milwaukee, Wis, assignors. to Cutler-Hammer
inc” Milwaukee... Wis-,_ a corporation. of‘ Delm
Ware
Apolieatinn December 10, 1.9.45, Serial No- 634.1158.
7. Claims. (01. 74-112),
>
1
This invention relatesto a rotary snap action
mechanism. Although, not limited thereto the
mechanism is particularly Well adapted for op
eration of electric circuit controllersof the drum
tyne.
An object of theinvention istoprovide arotary
Snanaction mechanism which is unusually rugged
and durable in construction and not likely-to vget
as indicated by the arrows 2?} in Fig. 1) show
ing the. construction and manner of pivotally
suizportihgthe pair of latching- pawls.
Fig. 3 is a fragmentary vertical sectional view,
on the line 3—.-3 of Fig. 1; the casing cover, and
bearing par-ts for both the driving and driven
shafts being also. illustrated, and
Fig, 4 is a. fragmentary top plan view, in sep
aratédrelation, of the pawlsrshown inF-ig. 2; the
Another object is to/providesuch ‘a mechanism 41-4,) pivot
portion‘ of the pin being shown in‘ trans
wherein the. necessity for overtravel of the mane '
verse cross section.
ual, operating member in moving the drum from
Referring to Fig. 1 of the drawings, the nu
each position, thereof to another is eliminated.
meral Ill designates the ?xed portion (usually a
Another. object is to ‘provide, a novel form of
latching wheel, to be rigidly attached to the. metal casting) of aieasing adapted to house» or
enclose a ‘circuit controlling drum, of any suit.
dyer shaft, anda pair. of. locking- pawls to be
.able or well known form having our improved
associated therewith.
snap, action Operating mechanism associated
7 Another; object isto so. construct and arrange
therewith. Portion lg) previerably has perforated
the pair of. paWlS as to illsul‘? posltivestoppine
lugs H and I2 formed'integraHy with and pro
of the latch wheel in. its? next
ittine laterally from the: respective side edges
incident. ‘10uesi
1m
tion by the inactive pawl as an succeeding,
or the bottom wall 13' adjacent, the rear end of
looking of the latch wheel throushthe-medium
out of . order.
9f anassociated star wheel.
'
the latter; similar perforated lugs. (not shown)
.
Another object. isto. provide for rotarst move.
ment of adriven element from a given‘pesition
to substantially any. desired number’ of other
being also preferably: provided at the forward
corners of said bottom wall. Said; lugs serve. the
usual purposev 0.1’ providing ior attachment of
positions. by. merely increasing the; number of
thevho'using by bolts orrwrews to a ?oor or sime
notches in the ‘latch wheel and by correspond
ingly increasing the number of projections .on
member (ruptshown)v of substantially U=shape in
horizontal cross section is adapted to ?t between
the .Star wheel.
.
-
Another object is to so construct and arrange
the pair of pawls as to insure against locking
of’ t __e mechanism in any given rotary position
Alone piece removable housing
on the-19011120211 ?angeor surface l4, l4 andthe cover
portion l5; (see
34); any well known means
being provided for attaching. said‘ removable
housing-member to portion l0
thereof inv the event of, breakage or other failure
_ Cover portion‘ L5 is. provided with. a relatively
of the driving spring.
i336
large
circular openinsxl?: (Fla 3‘) surrounded
Another object is to provide novel'means for
by an upstanding, ?ange‘ I1, to. which a metal
insuring return of each of the pawls to normal
member I 8 is attached ‘(preferably removably)
position after each operation of‘the snap action
by
suitablemeans (not shown)
mechanism.
~.8
'5:
provided
with a ~Gent-rally located circular
Other objects, and advantages of the invention
will hereinafter appear.
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The accompanying drawings illustrate a pre
ferred embodiment of the invention which will
now be, described, it being understood that the
embpdiment. illustrated is- susceptible of modi-?i
cation in respect of certain structural details
thereof withinithe scope of the appended claims.
In the drawings: Figure 1 is afrarnentary hori
zontal sectional Viewv of the ?xed portion of a
drum controller Casing, showing in top plan (and
indotted lines) most .of the elements of our-im
proved rotary snap action mechanism; the polyg
onalgportiontof the driving shaft being shown in
SBClZiQH-
.
Fig, ,2 is afragmentaliy: side?elevation-(viewed
;>
.I 9; surrounded by an upwardly extending
*?wges Z9‘ andqa downwardly extending flange
2L. Fla » go. 2;! is provided-with an annular recess
22, of;
tangular iorm in transverse cross» sec
PI'QIZ'OPQIliQg-Jw. the lower. face thereof‘ and com
munlieating. with the opening l9. v Said-recess is
aidaptedito, accommodate a unit comprising a pair
of’ annular ‘metal members 23 and24-, the adja
cent ‘inner edges of which. are complemetally
g eyed: to'provide a substantially semicircular.
io_ l-racefor partial accommodation of the’ usual
ser-
of- balls 25. The other half vof vthe ball-race
isformed-by providing an 1 annular groove 26 of
substantially semicircular form in the periphery
oiiaicircular metal member 21.; which is‘ of a size
55 to be freely-rotatable .within opening l9.
1
2,426,667
45 and 41 of the ball-bearing unit to retain the '
The members 23 and 24 are assembled with
respect to member 21, with the balls 25 inter
posed therebetween; after which a relatively thin
metal member 28 is formed thereabout as shown
to retain said parts in assembled relation. Mem
ber 21 is provided witha centrallylocated open
ing 29 ‘of ' polygonal ’_ form in transverse cross
latter in proper position. 7
A transversely divided metal spool composed of
like upper and lower portions 52, 52 has said
portions strung upon the intermediate cylindri
calportion 37!..of the driving shaft; said portions
'01
being ‘adaptedv to jointly accommodate {a multiple
coil torsion spring 53, "the outwardly extending
section (herein shown'as square) to accommo
end portions of which are designated by numerals
date with a rather close fit the upper end portion. Q r 54 and 55. Spool portions 52, 52 are interposed:
35, of corresponding shape inltransverse cross" ' "1 between the hub5l of wheel 49 and a metal block
section, of the driving shaft of the. device.
56 having a square opening 51 therethrough to
Said driving shaft is provided with a relatively
accommodate thelower end portion of the cor
‘long intermediate cylindricalportion 3], and'a ,1, 1, respondingly
shaped portion 370 of the driving a
slightly’ reduced cylindrical lower end portion
shaft. One end 58 extends laterally, a substan
32; a shoulder 33 being thus provided between
portions 3! and 32.
is tial distance beyond the spool portions 52, 52
The driven shaft of the device is designated I
by the numeral 34; on1y the upper end portion of; r
‘ said shaft being illustrated.
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60 which projects downwardly from member 55.
As shown pin 60 is preferably of cylindrical form
20 and opening 59 is correspondingly of circular
5
form in transverse cross section. When pin 50
has been pressedrinto the vopening 59, as shown,
in Fig. 3, said parts are preferably “tack” welded
to each other at the peripheral line designated
25 \by
numeral 6| in Figs. 1 and 3.
Shaft 34 is shown .
as of square form in transverse cross section, to
facilitate attachment of the ,usual segments or
contacts in a well‘known manner; itrbeing un
derstood that said shaft is of su?cient length
to accommodate the required or desired number
of movable contacts (not shown) to afford the de
sired circuit controllingcharacteristics; the ‘re
v quired number of stationary contacts on one or >
. both sides of shaft 34 being likewise provided.
1
and is provided with an opening 59 to accommo
date with a press ?t a relatively long ,metal pin
A-second, but‘ somewhat'longer, pin 52 is pro
vided; the same having a press fit within an
opening 63 extending through the aforemen
The‘ dotted line rectangle 734*‘ in Fig.3 is a gdia
wheel 31 and projecting, upwardly, from
grammatic representation of the ‘drum composed 30 tioned
the latter, as best illustrated'in Fig.‘ 3. Pin 62]
of the aforementionedstationary and movable .
is likewise preferably tack welded to wheel 31
along the peripheral line designated'by numeral
The'drive'n, or’ drum} shaft '34 is rotatably
v64 (Fig. 3). As shown'in'rFigs'. land 3 both of ;
supported within, the ‘housing, in’ any suitable‘ the pins 69 and_52 are overlapped by the spring
.manrie'r; the same, preferably having ball type 35 ends 54and 55 on opposite sidesth‘ereof, respec
bearings at or adjacent the upper and lower
tively. As shown inVFigs.,1'and3, wheel 49 is‘ -.
contacts.
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ends'thereof; one of the bearings being shown'at
35 *in Fig. 13, and the» same being substantially
like‘: the bearing unit (23, ‘24, 25, 21', 28 for the ,
upper end portion'sll of the driving shaft) afore
described. v'The' "metal? block ‘associated with
driven‘ shaft 34 and forming a part of the bear;
provided with an arcuate slot 65 to aiford ‘clear
'ance between the same andpin 62." The, periph- '
40 eralcontours'of the respective wheels .49 and 31
is’ best illustrated in Fig. 1. v
the latch
wheel 31 is shown as having six peripheral notches
31a, 31‘), 31°, 319, 31a and 31? The. portions of
.ing. 35 isdesignated by numeral '36.
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said‘notches
from view by wheel'49 are
'lA'fnetall‘ratchet or latch wheel 31"‘havin'gan'w ' indicated by hidden
dash lines in Fig. 1.
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integral hub 38' projecting‘ downwardly therefrom‘v
The latch-release or starjwheel 49 is provided»
has an ‘opening 397therethrough; said’ opening
with six double-inclined cam projectionsrespec- '
beingof square ‘form in transverse cross section
tively designated 48*’, 49*’, 49°, 49d, 49e and 49,‘,
to slidably ?t over the correspondingly shaped
Like relatively short pins 653 and??b (preferably'
upper end of shaftl34e Hub-'38’ is provided ‘at 60 of cylindrical form) are rigidlyfattached to the l _
one pointwith arthreaded opening 40 ‘to.accom-'
respective projections 49f and 49% and project
modate the shank‘ of a: set screw 4|, whichswh'en
upwardly-therefrom ‘for selective, engagement by .
tightened is adapted torigidly connect wheel 31
thellower end of‘p'in 69, according to the direc
to shaft 35'; a split lock-washer 42*and‘a lock- ‘
ition'of-rotation of driving'shaft 39, "asby means I
nut .43Lpreferably being associated with set ‘screw
41 .to' prevent accidental loosening thereofvjrIn; 155, of the usual manual operating , handle" Knot .
practice we prefer to providet'wo tapped open
ings 49 arranged at right angles to each‘ other,
and a ‘corresponding number ‘of setpscrews 4|.
V-Lat‘ch wheel 31 is providedin'itsupper surface
shown) . ,In practice we preferto provide the pro.- ~ '
~jections 59f and M's-with circular openingsto
accommodate reduced portions or shanks formed
' on pins 55a and 661’, the ends of whichshanks'
with'a-centrally: located countersink- or recess 60 are 'upset over the. lower surface ,ofwheel'49,' as‘
shown at ??cin'Fig. 3.
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447110, providel'a seat for' the ball-bearing unit .
A bracket 61 "has a horizontalportion I51a at
of known form, consisting’ of complementary
tachedstov the lower surface, of cover membergl5
outer elements 45 and 46, an inner element 41,
in any suitable manner, as by means of a pairof ' '
and the usual set of balls 48. Thereduced'lower
end 32' of the driving shaft ?tswithin the'rcir 65 bolts '58, 58' and nuts 58*‘, 59s; a, downwardly off¢
cular opening in the-inner element 41; the afore
mentioned shoulder, 33 being, ‘adaptedIto-seat
set horizontal portion ‘.911? of, said bracketlh‘aving ~ .
an‘ openingiiilc to accommodateithei upper reduced -
'end-»~portio'n '69s of-a, pivot p'injv said end portion
being upset. asishowniat f59b“(Fig.‘3)<to "secure
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49surrounds the lower. end of the intermediate -70. th'epin to said bracket, The relatively large in
termedialte portion 59° ‘ofsaidpinis surrounded .
cylindricalfportion; 3|’ of the ,driw'ng'Ishaft; a
bythe coils of: a torsion spring 10 whose'endpfor- V V
tubular member. 501 composed “of; self-lubricating
tions for extensions 19a and 191’ ‘are normally '
hearing material being’preferably interposed be
' vbiased into engagement with oppositesid'es re”- ’
tween. wheel49and saiddriving shaft‘; _Wheel, '75Qspectively'of‘
a pair of‘studsuorlpins Hand 12;, , Q»
49 as shown‘ overlies the ‘aforementioned elements
againstthe upper surface of element 41"(Fig. 3) ‘L
' ' ; A latch~trippingg(or pawl-tripping) star-wheel
‘2,426,667
the pin 1 Iv having a Shank portion riveted to, the
aforementioned bracket portion?lb, as shown at
‘Ha (Figs. 1 ‘and 3)., and the pin ‘[2 having a
shank riveted. to the lower surface of a metal
plate 13, as Shown at '12a in Fig, 3.
Plate 13 is
rigidly and permanently attached, as by fusion
Welding, than-upper machined metal member ‘M,
which is preferably of. square form in transverse
tion 3.0 of. the driving shaft. are provided with
openings extending transversely therethrough to
accommodate with a drive fit a tapered‘ pin 85,
whereby member 56 is restrained against mQVee
ment axially of thedriving shaft.
With the parts, of the snap action mechanism
constructed and arranged as aforedescribed,‘ the
driving shaft 30 may be rotated continuously in
cross section. as illustrated. in Fig. 4; three-fourths
of the lower surface area thereof being cut away, 10 either direction to provide for snap movement of
the driven shaft (and the movable drum, Contacts
or offset upwardly to provide a substantially
or segments carried thereby) through a total
triangular projection Or stop portion, as indi
range of twelve different positions spaced thirty
cated in dotted lines at ‘Me in. Fig. 4. A second
degrees apart. In practice, at least one of. said
metal member 74 (of the sameform as that afore
positions will be an “off” position of the drum.
described) is shown at the right-hand side of
Fig. 4, said second member being reversed end 15 If it isv desired to limit rotary movement of the
drum in opposite directions through a maximum
Wise,. so that the. projection 14FL is adapted to co
range of eleven different positions, a suitable. stop
operate. with the ?rst member to limit clockwise
member such as that shown in dotted lines ‘at 85
movement of the upper member ‘M and counter- in Fig. 1 may be rigidly attached to a part (such
clockwise movement of the lower member ‘M. The
members M having openings 14b therethrough to 20 as block 56) which is rotatable with the driving
shaft 30; stop 86 being adapted to cooperate with
freely accommodate a tubular bearing member
a suitable stop such as that shown in dotted lines
15a. formed of a suitable bearing metal or alloy.
at 8'! in Fig. 1.
Bearing member 75*‘. is freely slidable onto the
Stop 87 is preferably rigidly attached» to the
reduced pivot portion. 59d of the aforementioned
pin; said pivot portion iilld having. a transverse 2.5 stationary part It! of the drum housing, asil
lustrated. With suchan arrangement the drum
opening therethrough adjacent its lower end to
cylinder, represented; by driven shaft 34., may be
accommodate a cotter pin 15 or the like, whereby
rotated with a snap'action to eleven different
members '54, ‘M and ‘l5a are held in assembled
positions spaced thirty degrees apart. Thusifwit
relation thereto. A pair of metal pawls ‘l7 and
'18 (which may be bent in reverse directions as 30 be assumed that‘ the stationary and movable con
tacts of the drum are arranged to provide for “off,”
illustrated from identical blanks) have portions
positioning of the drum parts in the respective
77% and 18*’, respectively, of reduced with fusion
positions of the parts of the snap action mecha
welded or otherwise rigidly attached to members
nism shown in Fig. 1, then upon clockwise rota
"id in the relative positions shown in Figs. 1 to 4.
The latching end portions ‘Nb and T810 of pawls 3.5 tion of’ driving shaft 393 the drum parts may be
made to assume in sequence ten other rotary posi
All and 78 have opposite faces located in parallel
tions, all of which may be “on” positions to pro
planes approximately radial to the axial center
vide for commutation of a circuit to be controlled,
ofdriven shaft 35; said end portions prefer
ably having double-inclined edge portions desig 4.0 or any number of. which may likewise be “01?,” or
circuit interrupting, positions.
,
nated by numerals Tic and 18° (Fig. 1).
By suitably widening stop member 87, or by‘add“
A pair of like sheet metal members have por
ing a second stationary stop member such as that
tions 759a and 53*‘ thereof spot-welded or other
shown in dotted lines at 88 in Fig. l, the total
wise rigidly attached to the adjacent portions
lid and 78d of pawls ‘El and ‘18; the aforemen 45 number of different rotary positions to which the
tioned members having integral portions 79.1’ and
33b bent as shown to lie in substantially parallel
planes in the normal postions of the parts, as
shown in Fig. l. Portions. l9?’ and’SDb are pref»
erably provided with cylindrical bosses 79° and
i559, Figs, 1., 3 and 4, which act to center and re
tainthe opposite ends of a relatively heavy. coiled
compression spring 8!, whereby the pawls Tl
drum cylinder may be moved in sequence with a
snap action is reduced to ten. .
If the drum is ofthe reversing type, the parts
as illustrated may be assumed to be in “off” Dosi»
tion, and stops such as those shown atB‘I and 88
50 may be properly positioned to provide formove
ment of the drum cylinder with a snap action in
either direction to ?ve (or less than ?ve) different
“on” positions; it being obvious that the drum
shown in Fig. v1,. The spring 8! is adapted to 55 would be required to be returned to said “off” posi
tion before being rotated in a direction to provide
provide for movement of either ofv the pawls T!
the reverse connections afforded by such drum.
or 78 relatively to the other in the event of break
The stationary andmovable contacts of thedrum
age or other failure of the main torsion spring 53,
and the stop members may be arranged in vari
to thereby insure, against looking or binding of
ous different ways commonto the drum controller
said pawls with respect to the wheels 37 and49
of’, thesnap action mechanism, as hereinafter 60 art, dependingupon the particular‘ circuit con
and ‘i 8~ are biased to the normal positions thereof
more fully described.
7
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' As shown in Fig. 3, the ball bearing associated
with theuupperend portion of driven shaft 34 is
supported by a bracket, member 82, which may
be attached in any‘ suitable manner to the, part
is cfithe drum housing. Bracket '82 is provided
with an opening 82% to provide rotary clearance
forthepart 3;6_;_of said bearing. The, metal shell
.83 which retains the outer elements of the bear
ing in assembled. relationship, to each other, is
preferably‘weldedor otherwise rigidly attached
to e'sulfrgundies; plate. or annulus 8-4, which is
intern rigidly. attached to. bracket 82.
. .
’ AS shown in Figs; 1....and3, member .56 and nor
trolling functions desired.
‘
The operation of the snap action mechanism is
as follows: Assuming the drum parts to be in “off”
position, upon clockwise movement of driving
shaft 311, as by‘ means of a suitable manually oper
able handle attached thereto, the pin Gil will move
the projecting end 55 of torsion spring 53 to store
_ energy in the latter. Theend 54 of said spring
will tend to move. with pin 60, but will be re
strained by engagement thereof with pin 62,
which is attached to the latch wheel 3'! ; the latter
being locked against clockwise rotation by on
gagement of the lower shoulder of notch 378 (Fig.
1)., which isinitially quite closely adjacentthere-?
to, with thelatchingendrportion vTil’. ofpawl’l].
"2,426,667
7
Pin 60 continues in a clockwise direction until it
engages the-relatively short pin 66*‘ on star Wheel
49,. whereupon the latter is likewise positively
driven'in a clockwise direction.
cylinder carried thereby) , by the cooperative
30,'pins 60 and 62, pin 66“
. action of driving shaft
or 6B”, and slot 65., either end wall of which is
adapted to engage and positively drive pin 62 in
Such clockwise
the event of breakage of spring 53.
The aforedescribed arrangement of parts is
movement of wheel 49' results in engagement of
the left-hand inclined edge orcam'su'rface of pro
jection 49d with the end 11° ,of pawl 11 to rotate
' such that upon rotation of the driving shaft 30
in eitherdirection from a‘ given position to the
the latter out of the notch 318.
next succeeding operative position the driven
When pawl 11 has been rotated sufficiently to
shaft will be moved with a snap action to a rotary
"10
provide clearance for the outer edge of the por
position substantially exactly corresponding ‘
tion 731g interposed between notches 31d and 31e
thereto. That is‘to say, no overtravel of the driv
the wheel 31 will move with a snap-action, under
ing shaft is required to effect ‘snap movement of
the bias afforded by spring 53, until the right
the driven shaft to the position selectedtherefor
hand shoulder of notch 31° is engaged with the
by manual positioning of the usual operating
other pawl 18, as indicated ‘by the dotted line '15 handle, . This feature is of great practical im
position of the portion 31h interposed between .
portance, especially when an indicating dial or
notches 31b and 319 in Fig. 1. It is’ to be under
legends are employed in conjunction with the
stood that during the aforementioned rotating or
manual operating means; In’ like manner it is V
~ releasing movement 'of pawl 11 the pawl 18 will 7
obvious that if the handle of the driving'shaft is
be tilted further into the notch 31°, whereby stop
ping of latch wheel 31 after rotation thereof
through an angle of thirty degrees is positively
manually released prior to complete movement
thereof to its next succeeding rotary position, the
. torsion spring 53 will act automatically to effect
return of said driving shaft to its last preceding
'If'rotation of driving shaft 38 is discontinued
position. 'Correct indication of the condition of' 1
the elements of the snap action mechanism will 25 the circuit or circuits controlled by the drum is,
assume the relative positions illustrated (in part)
therefore insured under all conditions.
in dotted lines at 311‘, 49'’ and 31‘, 49° in Fig. 1.
We claim:
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insured.
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If, however, clockwise rotation of driving shaft
39 is 'continued,‘the left-hand inclined edge 'or
cam surface of projection 491’ will engage the end
18°» of pawl 18 (which .is stillrpositioned within
notch 31“, but with the right-hand shoulder of,
1. In an operating mechanism for-a circuit
controller, in combination, rotatable driving and,
driven shafts, a coiled torsion spring forming a
driving connection between said shafts, means for ;
effecting rotation’ of said driven shaft with a
snap action from any one of a plurality of posi
the’ latter adjacent said pawl, as' indicated in
dotted lines in Fig. 1), and upon lifting of pawl
tions thereof to ‘another,’ said last mentioned“.
18 until it clears'the outer edge of portion 3111 35 means comprising a latch wheel rigidly attached
(located between notches 31b and 31“) the wheel
to said driven shaft and a pair of spring-biased -
31 will again be moved clockwise with a snap
pawls selectively cooperable with said latch wheel
to temporarily lock the same pending storage of
action until the right-hand shoulder of notch 31d
(note dotted line showing of portion 311 in Fig. ,1)
engages the pawl 11, whose end is then positioned
40
a given amount of energy in said torsion spring,
a star wheel carried by said driving shaft and
with respect to which the latter has a predeter
' mined degree of lost motion upon rotation of
within notch 31d. The aforementioned lifting of
pawl 18 acts in the manner aforedescribed to tem
porarily tilt pawl 11 inwardly against the normal 7 said driving shaft in either direction, said star
bias of spring 18, for the purpose aforedescribed.
wheel coacting with each pawl when active to
Inasmuch as the driven shaft 34 is rigidly con-‘ 45 effect disengagement thereof from'sa'id latch -_
nected with wheel S'l'it follows that snap move
wheel to effect snap, movement of’ said driven
ment of the drumltlla to each of its various posi- , shaft to another'rotary position‘runder'the im
tions ‘is likewise ielfected through the medium of 7 pulse of said torsion spring.
the energy thus stored in torsion spring 53, which
2. In an electric circuit controller, in'combina- "
-is ofisuch'size or c’aliber’as to afford the‘ nec
essary torque’ or power.
Clockwise rotation of
50
' tion, a rotatable driving shaft {and a rotatable
driven'shaft, a coiled torsion spring affording
a drivingconnection therebetween, alatch wheel
driving‘ shaft '36 may:
thus be continuedthrough one onmore‘ complete '
revolutions thereof (in the absence of any stops
such as 86, 81) ;' and. as will be apparent, the snap
action mechanism acts in a substantially similar
rigidly attached to said driven shaft, a star wheel a
mounted on said driving, shaft adjacent
55 loosely.
and in parallel‘ relationship to said latch wheel,
means including a pin'associated with said driv-V
manner (but in reverse relationship to the parts
of wheels 31 and 49). upon coutnerclockwise rota
tion of driving shaft 38.
h
I
ing shaft and said spring to positively limit "the
degree of rotation of’ said driving‘ shaft in either
.
direction independently vof said star. wheel, _.a
As will be apparent from the foregoing descrip
pair. of spring-pressed'rpawls arranged to be see " I
tion, the spring 53 acts 'tdbias wheel 49 to the
lectively engaged by oneof a pairof spaced shoul
normal position relatively to wheel 31 andrrela
ders formed on said latch wheel, according'to the '7
' 'tively to block 56 .as shown in fulllines'iniFig. 1.
direction of rotation'of said driving shaft, pend;
Coiled torsion spring» 18 acts ‘to bias pawls 11' r
and 18 to the normal positions thei‘eofrrelatively, 65 ing storage of a- given amount of energy in said
to each other and to given normal positions’ with
' respect to theperipheries of wheels}?l and 139. v
torsion spring, the edge portion of, said,,star‘
wheel underlying each of said pawls;whereby
upon‘ a'given-degree of positive movementof said
' Coiled compression spring 3! acts in the imanner
' star wheel by said driving shaftrthe active pawl is " '
a'foredescribedfto permit yieldable movement of
lifted ,f-rom' locking" engagement .with the’ co:
‘70~
either pawl 11 M18 relatively to the other to
shoulder on said latch wheel to permit ' r
insure.v against looking or binding of the Isarnev > operating
a' predetermineddegree of rotary'movement of :j. 7'
withrespect to wheels 31 andJdQ inthe ‘event’ I the
,underthe bias of said; torsionspring,
of breakage or other failure‘ of, the main- spring ’ and latter
said driven ‘shaft having circuitcontrolling ' .
53.:1By this means we insure’ the ability 't'ofposif
elements a‘ssociatedetherewith. '
" tively rotate the driven shaft " (and the'druin
>75
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2,426,667
:3. ‘In an operating mechanism for a‘ circuit
‘controller,
combination,’ ‘rotatablyv-"mounted
driving and driven‘ shafts arranged in axial aline
ment, means including a coiled torsion spring in
10
ment, means including a coiled torsion spring in
terposed between said shafts for effecting rota
tion of ‘saiddriven shaft from’ each of‘a plural
terposed between said shafts’ for" effecting “rota
'ity of positions thereof to another, said last men
tion of said vdrivenshaft from each of a plural
ity ‘of positions'thereof to anotherysaid last men
'said'driven shaft, a-pair of pivoted pawls having
spring-biasing means’common thereto, said pawl-s
being selectivelycooperable with said latch wheel
tioned means comprising‘ a latch wheel ?xed to
‘said driven shaft, a pair of pivoted pawls having
spring-biasing means common thereto, said pawls
being selectively cooperable with said latch wheel
to' temporarily lock the same pending storage of
a predetermined amount ‘of energy in; said tor
sion sprlng, a- star wheel rotatably supported by
said driving shaft, a pin carried by said driving
shaft and having a predetermined degree of lost
motion with respect to said star wheel, a second
pin carried by said latch wheel and also having
a predetermined degree of lost motion with re
spect to said star wheel, said torsion spring hav
ing integral extensions arranged on opposite sides
of each of said pins and normally acting to main
tain said wheels in a given rotary relationship to
each other, said star wheel coacting with said
pawls selectively, according to the direction of
rotation of said driving shaft, to effect disengage
ment of ‘the pawl from said latch wheel, whereby
the energy stored in said torsion spring-is” re
leased to ‘effect movement of said driven shaft to
tioned means comprising a latch wheel ?xedto
to temporarily lock the same pending, storage of
ap-redetermined amount of energy in said tor
sion spring, a star wheel rotatably supported by
said driving shaft, 2. pin carried by said driving
shaft and havinga predetermined degree of lost
motion with respect‘ to said 'star wheel, a second
pin, carriedjby said latch wheel and also having a
predetermined degree of lost motion ‘with respect
- to said star wheel, saidtorsion springhaving in‘
tegral ‘extensions arranged on opposite, sides of
each of said pins and normally acting to main
a tain said wheels in a given rotary relationship to
each other, said star wheel c'oa'cting with said
pawls‘selectively, according to the direction 'of ‘ro
tation of said driving shaft, to e?ect disengage
ment of the pawl from said latch wheel, whereby
25 the energy stored in said torsion spring is re
leased to effect movement of ‘said driven ‘shaft to‘
its next succeeding position with a snap action,
the other pawl ‘under, such conditions cooperat
its next succeeding position with a snap action, 30 ing with said latch wheel to positively limit ‘the
angular degree of rotary movement of said driven
and the other pawl under such conditions cooper
shaft, the spring-biasing means common to said
ating with said latch wheel to positively limit the
pawls acting to return the same to their normal
angular degree of rotary movement of said driven
positions relatively to each other and to said star
shaft.
wheel and latch wheel after each snap movement
4. In an operating mechanism for a circuit
of said driven shaft, and said last mentioned
controller, in combination, rotatably mounted
driving and driven shafts arranged in axial aline
ment, means including a coiled torsion spring in
terposed between said shafts for effecting rota
tion of said driven shaft from each of a plurality
of positions thereof to another, said last men
tioned means comprising a latch wheel ?xed to
said driven shaft, a pair of pivoted pawls having
spring-biasing means common thereto, said
spring-biasing means also acting, in the event of
failure of said torsion spring, to permit forcible
movement of said star wheel and said latch wheel
relatively to either or both of said pawls, for the
purpose set forth.
6. In a reversing snap action operating mech
wheel to temporarily lock the same pending stor
anism for a drum controller, in combination, ro
tatable driving and driven shafts arranged in
axial alinement, means adapted upon a prede
termined degree of rotary movement of said
age of a predetermined amount of energy in said
driving shaft in either direction to effect a cor
pawls being selectively cooperable with said latch
responding degree of rotary movement of said
torsion spring, a star wheel rotatably supported
driven shaft with a snap action, said means com
by said driving shaft, a pin carried by said driv
ing shaft and having a predetermined degree of 50 prising a latch wheel rigidly attached to said
driven shaft, a star wheel carried by said driv
10st motion with respect to said star wheel, a sec
ing shaft and rotatable with respect thereto, said
ond pin carried by said latch wheel and also hav—
ing a predetermined degree of lost motion with
star wheel having an opening formed therein
respect to said star wheel, said torsion spring
eccentric to the axis thereof, a pin attached to
having integral extensions arranged on opposite 55 said latch wheel and extending with a predeter
mined amount of clearance through said star
sides of each of said pins and normally acting to
maintain said wheels in a given rotary relation
wheel opening, a second pin attached to and
movable with said driving shaft in an arc par
ship to each other, said star wheel coacting with
said pawls selectively, according to the direction
allel to said ?rst mentioned pin, a coiled torsion
of rotation of said driving shaft, to effect disen 60 spring surrounding said driving shaft and having
gagement of the pawl from said latch wheel,
end portions arranged to overlap opposite sides
whereby the energy stored in said torsion spring
of said pins, means affording a lost motion driv
is released to effect movement of said driven
ing connection between said second mentioned
shaft to its next succeeding position with a snap
pin and said star wheel, means comprising a pair
action, the other pawl under such conditions co 65 of hook-shaped pawls normally spring-biased to
operating with said 1atch wheel to positively limit
a given relationship to each other and to said
the angular degree of rotary movement of said
latch wheel, said pawls acting selectively to tem
driven shaft, and the spring-biasing means com
porarily lock said latch wheel against rotation in
mon to said pawls acting to return the same to
either direction pending storage of a given
their normal positions relatively to each other 70 amount of energy in said torsion spring, and
and to said star wheel and latch wheel after each
said star wheel acting in each instance to effect
snap movement of said driven shaft.
releasing movement of the active pawl, whereby
5. In an operating mechanism for a circuit
controller, in combination, rotatably mounted
driving and driven shafts arranged in axial aline~
said latch wheel and said driven shaft are moved
with a snap action to the next succeeding posi
tion thereof, the other pawl acting in each in
12
11
energy in said torsion spring, said star‘ wheel act- 7
‘ stanceto positively limit the degree of said move
ment'last mentioned.
a
7. In a reversing snap action operating mech
ing in each instance to e?ect releasing movement
1 anism for a drum controller, in combination, ro
to the next succeeding position thereof, the other
pawl acting in each instance to positively limit‘
the degree-of said movement last mentioned, and
the spring-biasing means associated with said
pawls’ serving to prevent binding of said pawl's
of the active pawl, whereby said latch wheel and '
said'driven shaft are moved with a snap action
tatable driving’ and driven shafts arranged in
‘axial alinement, means adapted upon a prede
termined degree of rotary movement of said
driving shaft in either direction to effect a cor
responding degree. of rotary movement of said
driven shaft with a snap action,’ said means com
10 with respect to said star wheel and said latch
wheel in the event of failure of said torsion spring}
prising a latch ‘wheel rigidly attached to said
to thereby render effective the aforementioned
a driven shaft, a star wheel carried’ by said driving
meansaffording a positive driving connection be
shaft and rotatable with respect thereto, said
tween said driving and driven shafts.
'
star wheel having an opening formed therein ec
centric to the axis thereof, a pin attached 'to 15
CHRISTIAN E. BUERKI. v
said latch wheeland extending with a predeter
HAROLD Ly. MEKELBURG.
mined amount of clearance through said star
wheel opening, a second pin attached to and mov
able with said driving shaft in an arc'parallel
to said ?rst mentioned pin, a coiled torsion spring 20
surrounding said driving shaft and having end
portions arranged. to overlap opposite sides of said
REFERENCES CITED'
The following references are of record in the
?le'of this patent:
'
pins, means affording a lost motion driving con
nection between said second mentioned pin and 7
Number
shaped pawls normally spring-biased to a given‘
660,634
2,009,383
[ relationship to each other and to said latch
2,395,969
wheel, said pawls acting selectively to temporarily
1,514,013
said star wheel, means comprising a pair of hook
25
lock said latch Wheel against rotation in either
direction pending storage of a given amount of 30
_
'
UNITED STATES ‘PATENTS
334,173
2,046,266
Name
.
7
‘
Date
7
Guett ________ _._~_;____ Oct. 30; 1900
Blume ____' ________ __ July 30, 1935
‘Kaser ___________ _'__ Mar. 5, 1946
Rudolph __'_ _____ __'__ Nov. 4, 1924
_ Kaiser _____ -1 _____ __ Jan. 12, 1886
Huhn ________ _'__-.___ June 30,1936 ’
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