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July 16, 1935.
c. A. MATsoN
2,008,140
AUTOMATIC REVERSE BRAKE
Filed Nov. 25, 1952
WN
5 Sheets-Sheet l
July 16, 1935-'
c. A. MATsoN
5 f
2,008,140
AUTOMATIC REVERSE BRAKE
Filed Nov. 25, 1952
_ 3 SheGtS-Sheet 2
July 16, 1935. ,
c. A. MA'rsQN
AUTOMATIC
2,008,140 `
REVERSE BRAKE y '
vFiled Nov. 25, 1932
5 sheets-sheet 5
Patented July 16, 1935
2,008,140
UNITED STATES PATENT OFFICE
2,008,140
AUTOMATIC
BRAKE
Carl A. Matson, Lynni‘ield, Mass., assigner to The
Matson Company, Concord, N. H., a corporation
of New Hampshire
Application November 25, 1932, Serial No. 644,169
9 Claims. (Cl. 192-4)
My present invention relates to a brake mech
anism, and Imore particularly to a novel and imn
proved automatic reverse brake for automobiles
or other mechanical devices.
verse `brake mechanism.
This ratchet ring is
normally restrained from rotation by means of
a novel pawl and latch mechanism which ’wil’L‘of
course, be hereinafter more fully described.
I have heretofore devised several distinct
As a further novel feature of my invention, I
mechanisms for accomplishing the highly de~ mount this ratchet ring upon a memberiixed to
sirable purpose of preventing inadvertent reverse a rigid part of the casing or housing of my de
vice, thus still further eliminating wear which
clines, and the device of this application per
would ordinarily occur, and also reducing likeli
tains to this same class or type oi mechanisms.
hood of unwanted rotation being imparted t'o
Another object of the present invention resides said ring.
in the fact that my present device is highly ef
Another object of my invention resides in the
iic’ient in operation, being positive in use, rugged, construction and arrangement of the locking
movement of a motor vehicle, particularly on in~
durable and long lived, while yet possessing the roller carrying means.
,
`
advantages of simplicity and economy.
Other objects and features of the invention re
Another feature of the present invention re side in the particular construction and arrange; 15
sides in the fact that a machine equipped with ment of the device and parts thereof, and all of
my device may be moved in a rearward direction, -the foregoing, together with other‘objects and
either under its own power or by hand, by placing features of the invention, will be hereinafter
the normally operative brake mechanism in an more fully pointed out, described and claimed. p
inoperative condition or position, this being ac
Referring to the drawings illustr’atinga pre
complished by simply moving the gear shift lever ferred embodiment of the present invention,
to reverse position and thence to neutral posin
Fig. l is a side elevation of an automobile
tion.
transmission mechanism, partly in section, i1-»
Another and important feature of the present lustrating my invention applied thereto;
25
invention resides in the fact that the locking ele
Fig. 2 is a plan sectional view on the line 2_2
ments, preferably rollers, are held out of idling of Fig. 1;
engagement during the forward movement of
Fig. 3 is a fragmentary vertical sectional View
30
the device.
The importance of this latter-mentioned fea
ture will be instantly apparent to and understood
by those skilled in this art, as the elimination of
idling of the locking elements during movement
on the line 3~--3 of Fig. l, with the device in the
position assumed during forward speed;
Fig. 4 is a vertical sectional View on the line`
30
3~3 of Fig. 1, with the locking rollers in braking
position;
,
`
_
'
`
of the device in a forward direction results in the
Fig. 5 is a fragmentary vertical sectional view,
total elimination of the major portion of the on an enlarged scale, on the line 5_5 of Fig. 4;
friction and Wear which would otherwise be im
Fig. 6 is a fragmentary vertical sectional view
posed upon these locking elements or devices.
similar to a part of Fig. 3, but on an enlarged
I accomplish this last mentioned and valuable scale; and
p
feature by the provision of a novel member which
Fig. 7 is a fragmentary Vertical sectional View
(if) I have herein termed a drag ring, associated with on the line lle-'l of Fig. 4.
’
the locking elements which in this instance are
Referring new to the drawings, for a particular
illustrated as rollers, and which drag ring is so description of the invention, its construction, as
constructed and arranged as to move said rollers, sembly and operation, it designates a transmis
on movement of the vehicle in a forward direc
sion casing provided with the usual transmission
“‘ tion, to the large end of the wedge chambers, gearing and having rotatably mounted therein
thus removing them from contact with the fixed and extending through the rear end thereof a
part of the device and preventing their idling transmission shaft
Il. Associated with said
l
during said forward movement, thus eliminating transmission shaft isy a free wheeling unit illus-.
chattering, friction and wear, and greatly in trated generally at l2. Mounted on _thetop of
creasing the eiii‘ciency, positiveness and life of the transmission casing ifi is a cover i3, in which
my novel device.
is pivotally mounted the gear shift lever I 3a for
A further feature of the present invention re operating the slide rods I4 and I5 associated with.
sides in the provision of a novel member which the speed changegearing within the casing I Il.
I` have herein termed a ratchet ring, and its as
Because of the presence of the free‘wheeling unit
Ul Jl- sociated parts, as the fixed part of my novel re
l2, itis necessary to equip said' slide rods’ with
35
4.5
2
2,008,140
extensions, in a manner and for a purpose to be
in Fig. 3, in order to cause forward movement of ,
hereinafter described in detail. Attached to the the vehicle to which the device is assumed to be
rear of the transmission casing I5 is a casing l1 attached, such forward movement will be effected
open at the rear end and provided with a cover independently of the ratchet ring 33, one of the
notches 34 of said ring being engaged by the pawl
I8 that is secured in position by bolts I9.
and said pawl in turn being engaged by the
Secured to the splined end of the transmission
shaft I I by a nut 2| is one member 22 of the usual latch end 5i of the lever 5t, said lever being
knuckle joint, the other member 23 being con forced to the position illustrated in Fig. 3 by the
nected to the propeller shaft 24. The hub 25 of plunger 63 controlled by the spring 54 confined
10 the member 22 is smoothed off, to provide a Vseat in the recessv 55 between the plunger G3 and the 10
26 (see Fig. 5) for a drag ring 21, said ring 21 screw plug 63. Such counter-clockwise move
being under pressure of the plungers 28 forced ment or rotation of the member 22 will tend to
force the rollers 31 to the right, as viewed in
Fig. 3, or toward the large end of the wedging
15 Ya part of the casing I1. Interposed between the chambers 35. This movement of the rollers 31
drag ring 21 and the member 22 is an anti-fric toward the large end of the chambers 35 is
tion bearing 32, so that the drag of the plungers assisted by the drag ring 21, the elongated studs
28 on the ring 21 will not be aifected by any fric
3° riding in the recesses
thereof and free rota
thereagainst
in the member
by the
3l, springs
said member
29 in. the
being
recesses
ñXed to
tional resistance which might otherwise occur on tion of said drag ring being resisted by the spring- `
pressed plungers
The movement of the rollers 20
20 the opposite side of said drag ring.
i Surrounding the member 3i and having a sub
stantially close nt thereon, although there is a
running
which I clearance
have herein
therebetween,
referred to,is for
a member
simplicity
31 to the right, viewing Fig. 3, will cause the
studs 33 and 33 to ride in the slots 44, thus posi
tively moving said rollers 31 out of contact with
the ratchet ring
thus entirely eliminating
25 and clarity, as a ratchet ring, because of the fact
idling contact of the yrollers 31 with the bore 35
that this ring is provided, on its periphery, with of said ratchet ring during forward movement of
a plurality of spaced notches 34. Symmetrically the device.
This elimination of idling Contact or engage
arranged
are recesses
about
35, the
saidperiphery
recesses forming,
of the member
with the
ment on the part of the ,rollers 31 removes the
30
bore 36 of the ring 33, substantially wedge-shaped greatest factor of wear therefrom, thus increasing '
or tapered chambers, in each of which is rotatably
and prolonging the life of the mechanism to a
mounted a roller 31.
material degree.
‘
From an inspection of Fig. l, it will be noted
Now assume that with the device in the posi
that While the` ratchet ring 33 is mounted on the tion illustrated in Fig. 3, the machine in which
35 member 3|, said ring projects outwardly from it is incorporated is stopped on an incline. Im 35
' said member and surrounds the member 22, but mediately upon stopping, there would tend to
is spaced slightly therefrom, as clearly illustrated be a retrograde movement ofthe vehicle, turning
in enlarged detail in Fig. 6, so that the rotation
of the member 22 will have no wearing effect on
40 the bore of the ring 33 or on the periphery of
the said member 22.
the shaft l i and member 22 in a clockwise direc
tion as indicated by the arrow in Fig. 4. How
ever, the ratchet ring 33 being held against move
40
ment, the drag on the ring 21, together with the
As will be noted from an inspection of Fig. 5, Y clockwise movement of the member 22, will force
each roller 31 is provided with a short projecting the rollers 31 toward the small end of their re
stud 38, on one side, and with a longer projecting spective chambers and toward the high ends of the
45 stud 39 on the opposite side. Unitedfto the mem slots 44, wedging said rollers between the inner
ber 22 by screws 40, and on each side thereof, are wall of saidchambers and the bore 36 of the ring
rings 4I and 42, the ring 4I having extensions 33, eifectually preventing any inadvertent reverse
43 in each of which is an inclined, slightly arcu movement of the vehicle.
«
ate slot 44, the ring 42 being provided with cor
Now assume that it is desired to move the de
50 responding slots 44. rI‘he drag ring 21 is pro
vice in a reverse direction, such as by motion
vided with radial recesses or slots 45, correspond under the vehicle’s own power. ri‘he gear shift
ing in number to the rollers 31. The short studs lever its is manipulated to reverse position, which
38 are located in the slots 44 in the ring 4i, and movement will cause a movement of the slide rod
the long studs 39 project through the slots 44 l5 and its extension 55 tothe rear, and an engage
55 in the ring 42 and into the radial slots or recesses ment of the cam face 5i of said extension with
45 in the drag ring 21.
cam face
of the lever
moving said lever
Pivoted at 46 is a lever 41 having thereon a about its pivot 4Q inca counter-clockwise move
pawl 48 and located above the pivot 45 is a sec ment, against the tension of the spring-pressed
ond pivot 49 on which is mounted a lever 5Fl hav plunger
which movement will free the latch 5I
6.0 ing a latch 5I , and also being provided with a cam from the lever 41. Thereupon, movement of the 60~
surface 52.
shaft il and member 22 in a clockwise direction,
The slide rod I4 is provided with an extension as indicated by the arrow in Fig. will also tend
53 which has a short cam groove 54, and the slide to move the ring
and when this movement
rod I5 is provided with an extension 55 which has occurs, the cam face El of the particular notch 34
65 an elongated cam groove 56, in which rest the in engagement with the pawl 48 will «force said 65.
camsV 51 and 58 respectively on the arm 59, which pawl out of said notch, to the position illustrated
in turn -is pivoted in the casingY I1 at 60.
in Fig. e.
The extension 55 is provided with a cam surface
will permit reverse movement of the de
6I and With a cut-away portion 62, as clearly vice, as will be readily understood and appre
70 shown in Fig. 4.
‘
ciated. Upon such movement taking place, when
Assuming the device to have been constructed the pawl ¿i8 is displaced from its notch 34, the
and arranged as above described, with the parts outer end of the arm 59 will drop into the cam
in the position in Fig. 3 and with the transmission grooves 54 and
to norma-1 position, and be en
shaft II and member 22 rotating in a counter gaged by the lever
as illustrated in Fig. 4,
75. clockwise direction, asillustrated bythe arrow holding the pawl ¿i3 out of engagement with the 75
2,008,140
ring 3,3. Thus, when the gear shift lever I3a. is retained in the; position illustrated in `lîig. 4, or
moved from reverse position to neutral, the de whether it is returned to neutral position, the
- vice will remain in the position illustratedin Fig. latch 68 will be held out of engagement with the
2; The elongated slot 55 permits movement‘of ratchet ring 3.3 by means of the lever 55.! bearing
ci the slide rod I5 and its extension 55 to the rear against the outer side of the extension 55. It
without effecting any vertical movement of the will thus» be Iappreciated that the lugs j'IG and
arm 59, as will be appreciated. It should be li afford means to positively disengage the lock~
noted that with the arm lever 5S lifted and held ing elements` comprising the latch 48 and the
in raised position, the spring 64 will force a notch notches 3d, `rather than relying upc-n the cam
1.0, 5l against the pawl 48 to lock said pawl against ming actions of the cam 4faces Sl on reverse
the camming action of the surfaces 6l on the rotation ci the ring 33, a feature» that will be
ring 33.
instantly rd'flllîlarel’lt to and understood by those
Now assume that the device is in neutral, as il
lustrated'in
l, and that it is desired to move
15s to a forward speed. On movement of the gear
shift lever I 3a into» rst or low gear, the slide
rod I5 and its extension 55 will be moved for
wardly, and the arm 59 will be engaged by the
rearmost wall of the elongated cam groove 56,
f.: raising the arm 5S to the position illustrated in
full lines in Fig. 3. This permits the plunger 63
to force the lever 5G in a clockwise rotative move
.skilled~ in this art.
,
_
This feature also eliminates diiiiculties which
might possibly ari-,se when relying upon the camming action to disengage the latch 48. For ex
ample, if the gears should not be exactly in reg
ister, it would frequently be difficult to effect
rearward movement of the vehicle in order to
exert such camming action. The novel feature 20,
just above described, however, entirely obviates
and eliminates this difhculty. l
ment, the pawl 48 falling to a position against
Furthermore, under some circumstances, such,
the outer peripheryv of the ring 33. If at this in for` example, as when a vehicle is rolling rear«
' stant, the pawl 68 is in register’ with one of the
wardly, and the operator moves the gear shift 25,
notches 311, it will engage said notch and the lever IBa to one of the forward speeds during
latch 5I will engage said pawl to hold the same such rearward movement, damage, injury, and
therein. If, however, the pawl 48 is not in regis considerable shock are likely to be caused by the
ter with a notch 35i, upon the slightest retrograde instantaneous meshing or engagement of the
movement of the vehicle, the ring 33 will be ro latch 48 with one of the notches 34.' as the ring 30
tated in a clockwise direction, and as soon as 33Y is rotating in its reverse direction. This is
the next succeeding notch registers with the pawl obviated however, by mounting the ratchetring
f2.8„engagement thereof will take place and fur 33 on a solid `member attached to the casing, as
ther retrograde movement be restrained.
aforesaid.
Upon movement of the gear shift lever i3d
from low or i'lrst gear to either ci the other for
ward speeds, the arm 59 will be raised out of the
cam groove 54, regardless of the direction of
movement of the slide rod I4 and its extension
53, tothe position illustrated in dotted lines in
As above explained, the said latch 48 will re~`
main in the notch engaged thereby until the
gear shift lever i3d is again moved toward re
verse position.
It will thus be appreciated that I have devised
a simple, positive, serviceable, and eiñcient, auto
Fig. 8, without affecting the relation of the pawl matically operable reverse brake mechanism, and>
40.
¿it and ratchet ring 33. Thus the device, in any Vsince I believe that the same is novel, I have
of the forward speeds, is constantly in operative therefore claimed said device broadly in this
position, it being necessary to move the gear shift application.
es. C.1 lever i3d to reverse position in order to render
While I have necessarily described my present 45
the braking device inoperative.
invention some-what` in detail, it will-be appre
It will be appreciated that when the gear shift ciated that I may vary the size, shape and ar
lever i3d is being moved from the neutral posi-- rangement of parts within reasonably wide lim
tion, with the device in the position illustrated its without departing from the spirit of the in~
50 in Fig. 4, the initiation of movement toward a vention.
50
.
forward speed will place the device in operative
My invention is further described and defined
position, without any material time interval be~- in the form of` claims as follows:
.
ing required to effect this result.
l. In a device of the kind described, the Vcom
In order to eliminate the necessity of `ñrst mov bination of a driven member, means for applying
55, ing the gear shift lever into or toward reverse power thereto to rotate the same in either di
position, and then returning the same to neutral ' rection, a locking element carried by said driven
before the vehicle can be moved forwardly or member, a ratchet ring surrounding said driven
backwardly, as, for example, on the licor of a member and cooperating with said locking ele-`
garage, I provide, on the lever 4l, a lug "IG in
Thus,
when the rod Iâ is moved rearwardly, as will be
the case'when 'the gear shift lever I3 is moved
toward reverse position, the cam face 6I of its
extension 55, engaging the cam face 52 on the
lever 5d, will swing said lever 5B about its pivot
60 register with a lug 'II on the lever Sil.
ment to prevent rotation of the driven member
in a reverse direction, means including a drag GO
ring in constant engagement with said locking
ele-ment to hold said'locking element out of en
gagement with the ratchet ring on rotation of
the driven member in a forward direction, and
spring controlled means to normally prevent ro»
49, bringing the lug 'II into engagement with the tative move-ment of said ratchet ring.
lug ‘IB and rocking the lever 4l' about its pivot
2. In a device of the kind described, the com
4t until the latch 48 is raised from its cooperat bination with a transmission gearing, including
ing notch 3K3 in the ratchet ring 33. This move a transmission shaft, of a driven member car
ment, of course, will be against the pressure of ried by said shaft, a locking element carried by P
the spring pressed plunger 63, and as the lever said driven member, a ratchet ring surrounding
5!) is rocked in a counter-clockwise direction, the said driven member and cooperating with said
arm 59 will drop to its normal position, as clearly locking element to prevent rotation of the driven
illustrated in Fig. 4.
member in a reverse direction, means including
75
Thereupon, whether the gear shift rod I5 is a resiliently controlled drag ring in constant 75
4
2,008,140
engagement with said locking element to hold driven member in a reverse direction, and a re
said locking element out of engagement with the
ratchet ring on rotation of the driven member
in a forward direction, a pawl normally engag
ing said ratchet ring to prevent rotativeV move
ment of said ratchet ring, and spring controlled
means to hold said pawl in lockingposition.`
3. In a device of the kind described, the com
bination of a driven member, means for apply
10 ing power thereto to rotate the same in ,either
direction, said driven member having a wedge
shaped recess therein, a member fixed to said
driven member at each side thereof and having
siliently controlled drag ring having a radial slot
therein engaged by one of the studs on said roller
to hold said locking roller out of engagement with
said ratchet ring on rotation of the driven member
in a forward direction, said drag ring being spaced
from said driven member and free from the direct
rotating influence thereof.
'7, In a device of the kind described, the com
bination of a driven member, means for applying 10
power thereto to rotate the same in either direc
tion, said driven member having a wedge-shaped
recess therein, a member fixed to said driven
inclined guiding slots therein adjacent to said member at each side thereof and having inclined
15 recess, a locking roller located in said recess, guiding slots therein adjacent to said recess, a 15
studs on said roller riding in said slots, a ratchet locking roller located in said recess, studs on said
ring surrounding said driven member and co rollers riding in said slots, a ñxed abutment ad
operating with said locking roller to prevent ro jacent to said driven member, a ratchet ring ro
tat-ably mounted on said abutment and projecting
tation of the driven member in a reverse direc
20 tion, and a resiliently controlled drag ring to over and surrounding said driven member and c0 20
hold said locking roller out of engagement with operating with said locking roller to prevent rota
the ratchet ring on rotation ofthe driven mem~
ber in a forward direction.
4. In a device of the kind described, the com
25 bination of a driven member, means for applying
power thereto to rotate the same in either direc
tion, said driven member having a wedge-shaped
recess therein, a member fixed to said driven
member at each side thereof and having inclined
30 arcuate guiding slots therein adjacent to said
recess, a locking roller located in said recess,
studs on said roller riding in said slots, a ratchet
ring surrounding said driven member and coop
tion of the driven member in a reverse direction,
and a resiliently controlled drag ring having a
radial slot therein engaged by one of the studs on
said roller to Vhold said locking roller out of en 25
gagement with said ratchet ring on rotation of
the driven member in a forward direction, said
drag ring being spaced fromv said driven member
and free from the direct rotating inñuence
thereof.
'
30
8. In a device of the kind described, the com
bination of a driven member, means for applying
power thereto to rotate the same in either direc
erating with said locking roller to prevent rota tion, said driven member having a wedge-shaped
35 tion of the driven member in a reverse direction, recess therein, a member fixed to said driven
and a resiliently controlled drag ring to hold said member at each side thereof and having inclined
locking roller out of engagement with the ratchet guiding slots therein adjacent to said recess, a
ring on rotation of the driven member in :a for
ward direction,
40
5. In a device of the kind described, the com
bination of a driven member, means for applying
power thereto to rotate the same in either direc- '
tion, said driven member having a wedge~shaped
recess therein, a member iiXed to said driven
locking roller located in said recess, studs on said
roller riding in said slots, a iîXed abutment adja
cent to said driven member, a ratchet ring ro 40
tatably mounted on said abutment and projecting
over and surrounding said driven member but
spaced therefrom and cooperating with said lock
ing roller to prevent rotation of the driven member
in a reverse direction', and a resiliently controlled
drag ring having a radial slot therein engaged by
one of the studs on said roller to hold said lock
ing roller out of engagement with said ratchet
ring on rotation of the driven member in a for
member at each side thereof and having inclined
guiding slots therein adjacent to said recess, a
locking roller located in said recess, studs on said
rollers riding in said slots, a ratchet ring sur~
rounding said driven member and cooperating
with said locking roller to prevent rotation of the ward direction, said drag ring being spaced from
said driven member and free from the direct ro
driven member in a reverse direction, and a re
siliently controlled drag'ring having a radial slot tating influence thereof.
` therein engaged by one of the studs on said roller
9. In a device Iof the kind described, the com
to hold said locking roller out of engagement with bination of a driven member; means for applying
said ratchet ring Ion rotation of the driven mem
ber in a forward direction.
6. In a device of the kind described, the com
bination of a driven member, means for applying
Ypower thereto to rotate the saine in either direc
60 tion, said driven member having a wedge-shaped
recess therein, a member fixed to said driven
power thereto to rotate the same in either direc
tion, said driven member having a wedge-shaped
recess therein, a locking roller located in said
recess, a ratchet ring surrounding said driven
member and cooperating with said locking roller
to prevent rotation of the driven member in a re
60
verse direction, said ratchet ring being of greater
member at each side thereof and having inclined width than said driven member and mounted in
guiding slots therein adjacent to said recess, a dependently thereof, and a resiliently controlled
locking roller located in said recess, studs on said drag ring to hold said locking roller out of engage
rollers riding in'said slo'ts, a ratchet ring sur
ment with the ratchet ring on rotation of the 65
rounding said driven member and cooperating driven member in a forward direction.
with said locking roller to prevent rotation of the
CARL A. MATSON.
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