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Патент USA US3046070

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July 24, 1962
F. w. STAGER ETAL
3,046,060
AUTOMOBILE ANTI-SKID CONTROL ASSEMBLY
Filed June 16, 1961
2 Sheets-Sheet 1
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July 24, 1962
F. w. STAGER ETAL
3,046,060
AUTOMOBILE ANTI-SKID CONTROL ASSEMBLY
Filed June 16, 1961
2 Sheets-Sheet 2
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United States Patent 0
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3,046,060
Patented July 24, 1962
1
2
3,046,060
Francis >W. Stager, Rte. 1, Stafford Springs, Conn., and
broken away and with the drive gear detached of the
anti~skid assembly illustrated in FIGURES 1 ?and 2.
FIGURE 4 is a vertical longitudinal cross sectional
view taken substantially on the line 4?4rof FIGURE 3.
AUTOMOBILE ANTI-SKID CONTROL ASSEMBLY
Robert ?N. Minor and Thomas A. Minor, both of
RED. 2, ?Rockville, Conn.
Filed June 16, 1961, Ser. No. 117,607
7 Claims. (Cl. 303-21)
This invention relates to automobile braking systems,
and more particularly to a device for automatically cut
ting off the application of braking force to an automo
bile wheel whenever the wheel decelerates relatively rap
5
FIGURE 5 is a transverse vertical cross sectional view
taken on the line 5?5 of FIGURE 4.
FIGURE 6 is a transverse vertical cross sectional view
taken on the line 6-~6 of FIGURE 4.
Referring to the drawings, and more particularly to
FIGURES 1 and 2, 11 designates a brake drum associated
with one of the wheels of an automobile, and 12 desig
nates the automobile Wheel backing plate which is se
cured to the frame of the vehicle in accordance with the
idly or tends to skid.
A main object of the invention is to provide a novel
usual construction. Secured to the backing plate 12 is
and improved skid-detecting device for use with an auto~ 15 a housing member 13 which includes a conventional
mobile wheel, said device being relatively simple in con
struction, being easy to install on existing automobiles,
and involving a relatively small number of moving parts.
double-acting brake cylinder 14 containing a pair of pis
tons whose rods 15, 15 are operatively connected to re
spective brake shoes 16, 16 engageable with the inside
?A further object of the invention is to provide an im
surface of the brake drum 11 responsive to the extension
proved anti-skid assembly for use with an automobile 20 of the piston rods 15, 15. Housing 13 is formed with a
wheel, said assembly including means for positively de
laterally projecting portion 17 which extends through the
tecting a skid condition, being reliable in operation to au
?wheel, said device being inexpensive to manufacture, be
backing plate 12 and which is formed with a top ?uid
inlet port 18 provided with a conduit ?tting 19 to which is
connected the ?exible conduit 20 leading to the brake
fluid supply source, for example, to the master cylinder
of the vehicle. Housing portion 17 is formed diametrically
opposite the port 18 with a port 21 communicating with
a passage 22 leading to the intermediate portion of the
ing compact in size, being substantially completely self
double-acting brake cylinder 14.
contained in a single assembly, and being relatively easy
to mount in an automobile Wheel.
Rotatably mounted in the housing 13 is a shaft 23 to
the end of which is secured a drive gear 24 which meshes
A still further object of the invention is to provide an
improved anti-skid assembly for use with an automobile
with internal gear teeth 25 formed on the inside cylin
drical wall of drum 11, whereby the shaft 23 is drivingly
wheel, said assembly providing positive skid detection,
coupled to the drum 11. Secured on the shaft 23 is a
cam wheel 26 formed on its peripheral surface with
tomatically interrupt the application of braking force to
the wheel under a skid condition, and requiring a mini
mum amount of maintenance.
A still further object of the invention is to provide
an improved anti-skid device for use with an automobile
being arranged so that it can be readily installed in an
automobile wheel without requiring radical modi?cations
of adjacent components of the wheel, causing no loss of
hydraulic ?uid to the associated brake system when used,
providing positive valve control, so that it operates in a
positive and reliable manner under skid conditions, be
ing easy to assemble or disassemble, and being substan
tially completely sealed against the entry of all dirt or
foreign material.
A still further object of the invention is to provide an
improved anti~skid assembly adapted to be employed with
an automobile wheel to independently control the wheel
so that the application of braking force is automatically
interrupted thereto when the wheel begins to skid, being
helical grooves 27. Designated at 28 is an annular ?y
Wheel which is rotatably and slidably mounted on the
shaft 23 and which normally receives the cam wheel 26,
as shown in FIGURE 4. A coiled spring 29 surrounds
the intermediate portion of the shaft 23, hearing between
the cam wheel 26 and the inner wall of a central re
cess 30 formed in the main cavity of the annular ?y
wheel 28, biasing the ?ywheel to the left, as viewed in
FIGURE 4, namely, away from the cam Wheel 26.
Threadedly secured in the supporting sleeve portion 31
of the flywheel 2.8 is a flanged bushing 32 which slidably
and rotatably engages on the shaft 23 along with the
sleeve portion 31. Designated at 34 is a sleeve member
arranged so that it requires no adjustment of its com
which is rotatably connected to the ?anged bushing 32 by
ponents after it has been installed, and utilizing only the 50 a ball bearing assembly 36, the sleeve member 34 being
physical forces developed by the automobile for its op
slidably received in the inside cavity 37 of housing por
eration.
tion 17 and being retained against rotation in said cavity
A still further object of the invention is to provide
by a pin member 38 secured in the cavity and engaging
an improved anti-skid assembly for use with an automo
bile wheel to automatically interrupt the application of
braking force to the ?wheel whenever rapid deceleration
_or skidding of the wheel occurs, the device being adapt
,ed for installation in any standard automobile wheel,
using readily replaceable standard parts, and being de
signed so that the fabrication? of the elements of the de
vice does not require close or critical tolerance values.
Further objects and advantages of the invention will
become apparent from the following description and
?claims, andfrom the accompanying drawings, wherein:
in a longitudinal groove 39 provided in the sleeve mem<
ber 34. The sleeve member 34 is formed with a peripheral
channel 40 which normally communicatively connects port
18 with port 21 so that brake fluid may ?ow from the sup_
ply conduit 20 to the intermediate portion of the brake
cylinder 14 when the control device associated with the
brake system, for example, the brake pedal, is actuated.
As shown in FIGURE 6, a ball valve 41 is provided
in the port 18, the ball valve being urged inwardly by a
coiled spring 42 but normally [being held in unseated posi
tion by engagement with the peripheral surface 43 of
65 sleeve 34 adjacent to the top end of the channel 40. The
FIGURE 1 is a vertical cross sectional view taken
through the upper portion of an automobile wheel as
sembly provided with an improved anti~skid device in ac
sleeve member 34 is ?formed with a detent recess 45 longi
tudinally aligned with the ball valve 41 and connected to
the channel 40 by a short relief channel 46 formed longi
tudinally on the periphery of the sleeve 34. When the
?FIGURE 2 is a vertical cross sectional view taken sub 70 sleeve 34 is moved to the right from the position thereof
stantially on the line 2???2 of FIGURE 1.
shown in FIGURE 4, the ball element 41 will engage in
FIGURE 3 is an enlarged perspective view, with parts
the recess 45, allowing the ball element to close off the
cordance with the present invention.
3,046,060
3
4
port 18 and to disconnect port 21 from the ?uid pressure
with the brake cylinder 14, the valve 66 opening at a
predetermined ?uid pressure in the accumulator chamber
to allow brake ?uid to return to the brake cylinder, where
supply conduit 20?. Under these conditions, the periph
eral channel 40 is moved to the right so that it is sealed
off, cutting off the communication between the ports .18
by to maintain a continuous balanced or modulated pres
and 2-1. The ball element 41 acts as a yieldable locking 5 sure on the pistons in the brake cylinder, which is trans
means to retain the sleeve member 34 in its sealing posi
mitted through the brake shoes 16, 16 by the piston rods
tion.
15, 15, to maintain a minimum? braking force on the
The ?ywheel 28 is provided with pairs of diametrically
shoes. The ball valve 66 opens at a relatively low pres
opposed, inwardly projecting coupling ball elements 47,
sure, enabling the spring loaded accumulator piston 64
47 which are disposed in radial passages 48 provided in 10 to maintain a continuous balanced or modulated pressure
the annular ?ywheel 28 and which are biased inwardly
on the brake pistons.
into engagement with the helically grooved peripheral sur
The brake cylinder 14 is provided with a conventional
face of the cam wheel 26 by coiled springs 49?, as shown
bleeder valve assembly 76 which enables the brake? cylin
in FIGURE 4. The coupling balls 47 normally engage
der to be bled in the usual manner whenever required.
in the grooves 27 and drivingly connect the cam wheel
In operation, when a skid condition develops, the
26 to the ?ywheel 28. However, if the speed of rotation
of the shaft 23 should decrease relatively rapidly, the
inertia of the ?ywheel 28 causes the ?ywheel 28 to be
shaft 23 is decelerated relatively rapidly, because of the
rapid deceleration of the brake drum '11, transmitted to
the shaft 23 through the driving gear 24. The sudden
moved to the right, as viewed in FIGURE 4, as will be
presently explained.
change in the speed of rotation of the cam wheel 26 is
20
applied through the helical grooves 27 and the yieldable
Since the coupling balls 47 are yieldable inwardly, a
balls 47 to the ?ywheel 28, which tends to rotate at a
sudden decrease in speed of the cam Wheel 26 will cause
the cam wheel to decelerate with respect to the relatively
heavy ?ywheel 28 and will allow the cam wheel to rotate
relatively steady speed, causing the ?ywheel 28 to be
relative to the ?ywheel against the retarding action of
munication between port 18 and port 21, and thus cutting
the spring-pressed balls 47. However, since the balls 47
must travel along the helical grooves 27, the reaction de
veloped ?will cause the ?yweel 28 to be moved to the right,
as viewed in FIGURE 4, moving the sleeve member 34
therewith and ?blanking the channel 4%} so as to interrupt
off the supply of pressure ?uid to the brake cylinder \14.
It will be readily understood that the cause of the skid
condition is the sudden deceleration of the wheel follow
the supply of ?uid under pressure to the brake cylin
der 14.
Housing 13 is formed adjacent the brake cylinder 14
with an accumulator chamber 50 which is connected to
?a valve chamber 51 formed between the chamber 56 and
the brake cylinder by a passage 52. A ball valve 53 is
urged by a spring 54 into engagement with a seat pro
moved to the right, as viewed in FIGURE 4, by the
resultant reaction, as above described, cutting off com?
ing the application of the brakes, possibly due to the
relatively slippery underlying road surface. With the
?uid pressure cut off, the application of braking force is
discontinued, and simultaneously, the ?uid under pressure
?in the brake cylinder is allowed to escape into the ac
cumulator chamber 50 because of the opening of the
ball valves 53 and 55 resulting from the movement of the
valve piston 57 to the right, because of the coupling en
vided therefor, normally sealing passage 52 with respect
gagement of the annular ring or ?ange 60 with the groove
59 in the end of the piston 57. The piston 57 is moved
to the valve chamber 51. The ball valve 53 projects into
the passage 51. A similar ball valve 55 is provided be
tween the passage 56 leading to the brake cylinder 14 and
the valve chamber ?51. As shown in FIGURE 4, the
ball elements 53 and 55 are located diametrically oppo
site eaoh other and project into the valve passage 51.
Designated at 57 is a valve piston which is slidably and
sealingly mounted in the passage 51 and which is formed
to the right, as viewed in FIGURE 4, being disengaged
from the locking ball 62, and reaching a position wherein
the locking ball 62 is externally adjacent to the head or
end of the piston 57. In this position, the balls 53 and
55 are held unseated, allowing the pressure ?uid in the
brake cylinder to ?ow into the accumulator chamber 50
against the relatively yielding piston 64. The check valve
with a reduced inner end 58 which is cammingly engage~
66 opens at a relatively low pressure, allowing the brake
?uid to return from the accumulator chamber 50 into
the brake cylinder 14 to maintain a continuous balanced
able with the ball elements 53 and 55 responsive to the
inward movement of the valve member 57 to unseat the
pressure on the ?brake pistons so as to maintain a mini
ball elements and to establish communication between 50 mum braking [force on the brake drum 11. With the
passages ?52 and ?56. The outer end of valve member 57
major portion of the braking force relieved, the wheel
is formed with an annular groove '59 which is engaged
is allowed to regain traction, whereby the skid condition
by a ?ange 60 projecting from the periphery of the ?y
is automatically corrected. When the shaft 23 resumes
wheel 28, so that the piston member ?57 is movable longi
a speed approaching that of the ?ywheel 28, the ?ywheel
tudinally with the ?ywheel. A ball detent 62 is provided 55 is moved to the left, as viewed in FIGURE 4, by the bias
in the subjacent wall of housing 13, the detent ball 62
ing spring 29, allowing the channel 40 to be returned to
engaging in the groove 59' to yieldably hold the valve
a position of registry with the ports 18 and 21, and the
piston 57 in the normal position thereof shown in FIG
valve piston 57 is moved to the left, as viewed in FIG
URE 4, namely, the position wherein the ball valves 53
URE 4, allowing the balls 53 and 55 to resume their
and 55 are in sealing positions. However, when the ?y 60 seated positions. This restores the connection between
wheel 28 is moved to the right, as viewed in FIGURE 4,
the ?uid pressure supply conduit 20? and the brake cylin
as a result of sudden deceleration of shaft 23, as above
der 14 ?and allows the normal braking action to be ob
explained, the piston 57 is likewise moved to the right,
tained.
unseating the ball elements 53 and 55 and connecting the
It will be noted that the apparatus functions auto
interior of brake cylinder 14 to the accumulator chamber 65 matically to cut off the supply of ibraking ?uid and to allow
50, allowing the brake ?uid in the cylinder to escape into
the wheel to resume traction even though the operator of
the accumulator chamber.
the vehicle continues to apply braking force to the brake
A piston ?64 is provided in the chamber 50, the piston
pedal. Since each wheel is provided with the skid de
64 being urged to the right, as viewed in FIGURE 5,
tection means above described, the Wheels respond inde
by a coiled spring 65, the spring 65 being relatively light,
pendently to skid conditions and automatically relieve the
so as to impose merely a biasing force on the piston 64
braking force on the wheels when the wheels approach
which is insu?icient to prevent the discharge of the pres
said skid conditions. As a result, when the brakes are
sure ?uid from the brake cylinder 14 into the accumulator
chamber 50. A check valve 66 is provided in an aux
applied by operating the brake pedal in the usual manner,
the wheels will receive braking force in accordance with
iliary passage 67 connecting the accumulator chamber 75 the particular subjacent roadway conditions, and if any
3,046,060
5
wheel should approach a skid condition, the braking ?force
will be relieved thereon automatically without any further
action on the part of the Vehicle operator.
While a speci?c embodiment of an improved automo
bile automatic anti-skid ?control apparatus has been dis
closed in the foregoing description, it will be understood
that various modi?cations within the spirit of the inven
6
grooves in the peripheral surface of said cam wheel to
move the ?ywheel axially on the shaft member when the
shaft member decelerates relative to the ?ywheel, said
yieldable coupling means allowing the cam wheel to ro
tate relative to the ?ywheel without axial movement of the
?ywheel when the rate of deceleration is relatively high,
conduit means including a normally open valve connecting
tion may occur to those skilled in the art. Therefore, it
said source of brake ?uid to said brake cylinder, and
is intended that no limitations be placed on the invention
means closing said valve responsive to the axial move
except as de?ned by the scope of the appended claims.
10 ment of the ?ywheel on the shaft member.
What is claimed is:
4. In a vehicle wheel structure, a wheel backing plate,
1. In a vehicle wheel structure, a rotating brake drum,
a rotating brake drum disposed adjacent said backing
a brake shoe movable into engagement with the drum, a
plate, a brake shoe in the drum movable into engagement
brake cylinder operatively connected to said shoe, a source
with the drum, a brake cylinder operatively connected to
of brake ?uid under pressure, a shaft member rotatably
said shoe, a source of brake ?uid under pressure, a shaft
mounted in said drum, means drivingly coupling said
shaft member to said drum, a ?ywheel rotatably and
member rotatably mounted in said drum, internal periph
eral gear teeth in the drum, a drive gear secured on said
slidably mounted on said shaft member, a cam wheel
shaft member and meshing with said internal gear teeth
secured :on said shaft member and having a helically
drivingly coupling said shaft member to said drum, a
grooved peripheral surface, yieldable coupling means on 20 ?ywheel rotatably and slidably mounted on said shaft
said ?ywheel engaging said peripheral surface and normal
ly drivingly coupling said ?ywheel ?to said cam wheel, said
coupling means being cooperable with the ?grooves in the
peripheral surface of said cam wheel to move the ?ywheel
axially on the shaft member when the shaft member de
celerates relative to the ?ywheel, said yieldable coupling
means allowing the cam wheel to rotate relative to the
member, a cam wheel secured on said shaft member and
having a helically grooved peripheral surface, yieldable
coupling means on said ?ywheel engaging said peripheral
surface and normally drivingly coupling said ?ywheel to
said cam wheel, said 'couplingrneans being cooperable
with the grooves in the peripheral surface of said cam
wheel to move the ?ywheel axially on the shaft member
when the shaft member decelerates relative to the ?y
?ywheel without axial movement of the ?ywheel when the
rate of deceleration is relatively high, conduit means in
wheel, said yieldable coupling means allowing the cam
cluding a normally open valve connecting said source of 30 wheel to rotate relative to the ?ywheel without axial
brake ?uid to said brake cylinder, and means closing said
movement of the ?ywheel when the'rate of deceleration
valve responsive to the axial movement ?of the ?ywheel on
is relatively high, conduit means including a normally
the shaft member.
open valve connecting said source of brake ?uid to .said
2. In a vehicle wheel structure, a rotating brake drum,
brake cylinder, means closing said valve responsive tothe
a brake shoe movable into engagement with the drum, a 35 axial movement of the ?ywheel on the shaft member, a
brake cylinder operatively connected to said shoe, a
source of brake ?uid under pressure, a shaft member
rotatably mounted in said drum, means drivingly cou
pling said shaft member to said drum, a ?ywheel rotatably
and slidably mounted on said shaft member, a cam wheel
secured on said shaft member and having a helically
brake ?uid release chamber, means including a normally
closed release valve communicatively connecting said
brake cylinder to said release chamber, and means open
ing said release valve responsive to said axial movement
of the flywheel on the shaft member.
5. In a vehicle wheel structure, a rotating brake drum,
grooved peripheral surface, yieldable coupling means on
a brake shoe movable into engagement with said drum, a
said ?ywheel engaging said peripheral surface and nor
brake cylinder operatively connected to said shoe, a source
mally drivingly coupling said ?ywheel to said cam wheel,
of brake ?uid under pressure, a shaft member rotatably
said coupling means being vcoo-perable with the grooves in 45 mounted in said drum, means drivingly coupling said
the peripheral surface of said cam wheel to move the ?y
shaft member to said drum, a ?ywheel rotatably and
wheel axially on the shaft member when the shaft mem
ber decelerates relative to the ?ywheel, said yieldable
slidably mounted on said shaft member, a cam wheel
secured on said shaft member and having a helically
coupling ?means allowing the cam wheel to rotate relative
grooved peripheral surface, yieldable coupling means on
to the ?ywheel without axial movement of the flywheel 50 said ?ywheel engaging said peripheral surface and nor
when the rate of deceleration is relatively high, conduit
mally drivingly coupling said ?ywheel to said cam wheel,
means including a normally open valve connecting said
said coupling means being cooperable with the grooves
source of brake ?uid to said brake cylinder, means closing
in the peripheral surface of said cam wheel to move the
said valve responsive to the axial movement of the ?y
?ywheel axially on the shaft member when the shaft
wheel on the shaft member, a brake ?uid release chamber, 55 member decelerates relative to the ?ywheel, said yield
means including a normally closed release valve com
able coupling means allowing the cam Wheel to rotate
municatively connecting said brake cylinder to said release
relative to the ?ywheel without axial movement of the
chamber, and means opening said release valve responsive
?ywheel when the rate of deceleration is relatively high,
to said axial movement of the ?ywheel on the shaft mern~
ber.
3. In a vehicle wheel structure, a wheel ?backing plate,
a rotating brake drum disposed adjacent said backing
a sleeve member rotatably received on said shaft mem
ber, means connecting said sleeve member to said ?yweel
for axial movement therewith relative to the shaft mem
ber, said sleeve member having a peripheral ?uid channel
thereon, housing means slidably receiving said sleeve
plate, a brake shoe in the drum movable into engagement
with the drum, a brake cylinder operatively connected to
member and having opposing ports normally registering
said shoe, a source of brake ?uid under pressure, a shaft 65 with said channel, and conduit means including said ports
member rotatably mounted in said drum, internal periph
and channel connecting said source of brake ?uid to said
eral ?gear teeth in the drum, a driving gear secured on said
brake cylinder, said ?ywheel being movable axially on
shaft member and meshing with said internal gear teeth
said shaft member sufficiently to move the channel out of
drivingly coupling said shaft member to said drum, a ?y
registry with said ports, whereby to interrupt the supply
wheel rotatably and slidably mounted on said shaft mem 70 of brake ?uid to said brake cylinder.
ber, a cam wheel secured on said shaft member and having
6. In a vehicle wheel structure, a rotating brake drum,
a helically grooved peripheral surface, yieldable coupling
a brake shoe movable into engagement with the drum, a
means on said ?ywheel engaging said peripheral surface
brake cylinder operatively connected to said shoe, a source
and normally drivingly coupling said ?ywheel to said cam
of brake ?uid under pressure, a shaft member rotatably
wheel, said coupling means being cooperable with the 75 mounted in said drum, means drivingly coupling said
3,046,060
8
7
shaft member to said drum, a ?ywheel rotatably and slid
ber, a cam wheel secured on said shaft member and hav
ably mounted on said shaft member, a cam wheel se
ing a helically grooved peripheral surface, yieldable cou
pling means on said ?ywheel engaging said peripheral
cured on said shaft member and having a helically grooved
peripheral surface, yieldable coupling means on said ?y
wheel engaging said peripheral surface and normally driv
surface and normally drivingly coupling said ?ywheel to
said cam wheel, said coupling means being cooperable with
the grooves in the peripheral surface of said cam wheel to
move the ?ywheel axially on the shaft member when the
shaft member decelerates relative to the ?ywheel, said
yieldable coupling means allowing the cam wheel to ro
celerates relative to the ?ywheel, said yieldable coupling 10 tate relative to the ?ywheel without axial movement of
the ?ywheel when the rate of deceleration is relatively
means allowing the cam wheel to rotate relative to the
high, a sleeve member rotatably receiving said shaft mem
?ywheel without axial movement of the ?ywheel when
ber, means connecting said sleeve member to said ?y
the rate of deceleration is relatively high, a sleeve mem
wheel for axial movement therewith relative to the shaft
ber rotatably receiving said shaft member, means con
necting said sleeve member to said ?ywheel for axial 15 member, said sleeve member having a peripheral ?uid
channel thereon, housing means slidably receiving said
movement therewith relative to the shaft member, said
sleeve member and having opposed ports normally reg
sleeve member having a peripheral ?uid channel thereon,
ingly coupling said ?ywheel to said cam wheel, said cou
pling means being cooperable with the grooves in the
peripheral surface of said cam wheel to move the ?ywheel
axially on the shaft member when the shaft member de
housing means slidably receiving said sleeve member and
istering with said channel, conduit means including said
having opposing ports normally registering with said
ports and channel connecting said source of brake ?uid
channel, conduit means including said ports and channel
connecting said source of brake fluid to said brake cylin
der, said ?ywheel being movable axially on said shaft
to said brake cylinder, said ?ywheel being movable axial
member sufliciently to move the channel out of registry
ly on said shaft member sufficiently to move the channel
out of registry with said ports, whereby to interrupt the
supply of brake fluid to said brake cylinder, a brake ?uid
with said ports, whereby to interrupt the supply of brake
release chamber, means including a normally closed re
?uid to said brake cylinder, a brake ?uid release cham
lease valve communicatively connecting said brake cylin
ber, means including a normally closed release valve com
der to said release chamber, and means opening said re
municatively connecting said brake cylinder to said re
lease valve responsive to said axial movement of the ?y
lease chamber, and means opening said release valve re
wheel on the shaft member.
lease valve responsive to said axial movement of the ?y
wheel on the shaft member.
30
7. In a vehicle wheel structure, a wheel backing plate,
a rotating brake drum disposed adjacent said backing
References Cited in the ?le of this patent
UNITED STATES PATENTS
plate, a brake shoe in the drum movable into engagement
2,107,823
Hallot _______________ __ Feb. 8, 1938
with the drum, a brake cylinder operatively connected to
2,414,879
2,631,696
2,753,017
Johnson _____________ __ Jan. 28, 1947
Yarber ______________ __ Mar. 17, 1953
2,904,136
Greenough __________ __ Sept. 15, 1959
48,806
France _______________ __ May 3, 1938
said shoe, a source of brake ?uid under pressure, a shaft 03 Or
member rotatably mounted in said drum, internal periph
eral gear teeth in the drum, a driving gear secured on said
shaft member and meshing with said internal gear teeth
drivingly coupling said shaft member to said drum, a ?y
wheel rotatably and slidably mounted on said shaft mem 40
Curl et al. ____________ __ July 3, 1956
FOREIGN PATENTS
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