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Nov. 5, 1946„
E. E. HOOD
»
¿M9585
COASTER BRAKE
Filed Nov. s, 1944
WITNESS :
2 sheets-sheet 1
Nov. 5, i946,
'
E. E. HOOD
2,410,785
COASTER BRAKE
Filed Nov. 3, 1944
2 Sheets-Sheet 2
IN VEN TOR.
WITNESS:
~
B
Yam
' Patented Nov. 5, 1946
2,410,785 l
UNITED STATES PATENT OFFICE
2,410,785
COASTER BRAKE
Edwin Elliott Hood, Elmira, N. Y., assigner to
Bendix Aviation Corporation, Elmira Heights,
N. Y., a corporation of Delaware
Application November 3, 1944, Serial No. 561,731
7 Claims.
(Cl. 192--6)
2
a different form of retarder for the threaded
The present invention relates to a coaster brake
for velocipedes and the like and more particu
larly to a back-pedaling hub brake.
clutch member; and
Fig. 4; is a detail in perspective of the clutch
and brake expanding members with the retarder
for the clutch member, shown in disassembled
relation.
In Fig. l of the drawings there is illustrated
,
It is an object of the present invention to pro
vide a novel coaster brake which is efficient and
reliable in operation and simple and rugged in
construction.
an axle I threaded at its ends for the reception
of clamping nuts 2 and 3, a bearing cone member
¿l and a bearing cone and anchor member 5. A
It is another object to provide such a device
which provides a large area of surface contact
between the braking members, the braking sur
faces being at the greatest possible radial dis
driving member S having a sprocket 'I ñxedly
mounted thereon is journalled on the cone mem
tance from the axis of the wheel hub. '
ber 4 by means of bearings 8, and is provided
It is another' object to provide such a device in
which the braking elements are all anchored
with a bearing race 9 for the reception of bear
15 ings I6.
A wheel hub II is journalled on the bearings
It is a further object to provide such a device
It at one end and at the other end on bearingsincorporating a cylindrical brake sleeve which
i2 which cooperate with the anchor member 5.
is divided into a plurality of parts that are ex
positively against rotation.
panded into frictional engagement with the in
terior of the wheel hub.
‘
A brake sleeve comprising two‘ substantially
20 semi-cylindrical parts I3, I4 is provided with an
It is another object to provide such a device
in which the means for expanding the brake
sleeve have a large area of surface contact there
with so as to provide low unit pressures between
the parts, thus securing easy operation and ob
viating the likelihood of sticking of the brake
parts.
exterior surface which fits the interior cylin
drical surface of the hub II. The anchor mem
ber 5 is provided with a conical portion I5 which
extends within and supports the brake sleeve, the
adjacent ends of the brake sleeve members I3, I4
being conically flared as indicated at I6 so as
to substantially fit the conical extension I5. A
conical brake applying expander member I1 for
the brake sleeve is slidably journalled on the
axle I in position to enter the opposite end of
the brake sleeve which is conically flared as
shown at I8 to conform therewith. The ex
pander` member Il and the anchor member 5
are provided with corresponding axially extend
It is a further object to provide such a device
in which the brake sleeve is formed with an in
terior surface which substantially ñts the in
terior surface of the wheel hub, and the expand
ing means for the brake sleeve are in the form
of conical members which conform closely with
conical interior surfaces of the sleeve when the
sleeve is expanded into engagement with the hub. 35 ing recesses I9 and 20 respectively, and splines
or keys 2l and 22 are arranged to slidably fit at
Another object is to provide such a device in
their ends in said recesses so as to prevent rela
corporating means for ensuring immediate
tive rotation between the expander member and
actuation of the brake without lost motion.
Another object is to provide such a device in 40 anchor member. The splines 2l and 22 are lo
cated between the brake sleeve members I3, I 4
which the brake expanding member is confined
so as to also prevent rotation of the sleeve mem
closely to its operative position, while being per
bers while permitting relative longitudinal move
mitted only sufficient longitudinal movement to
ment of the brake actuating parts. Rotation of
perform its controlling function.
the anchor member 5 is prevented by means of a
Further objects and advantages will be ap 45 brake arm 23 which is clamped on the flatted ex
parent from the following description taken in
tremity 24 of the anchor member by means of a
connection with the accompanying drawings in`
nut 25 threaded on the axle I, the arm 23 being
which:
,
connected to the frame of the vehicle, not illus
Fig. 1 is a side elevation partly broken away
and in section of a preferred embodiment of the
invention;
Fig. 2 is an exploded detail view of the brake
sleeve and the operating mechanism therefor.
Fig. 3 is a view similar to Fig. 1, showing an
embodiment of the invention which incorporates 55
trated, in any suitable manner. '
The driving member 6 is provided with a screw
threaded extension 26 fixed thereto in any suit
able manner as by meansl of a brazed connection
2l' and extending into close proximity tothe
expander member I1 so as to limit _longitudinal
movement thereof to the left in Fig. 1. A clutch
f
2,410,785
and brake actuating member 28 is threaded on
the extension 26 of the driving member and is
provided at one end with a conical clutch sur
4
the means for ensuring traversal of the control
nut 28 are anchored so as to be prevented from
rotation. In these íigures, the elements of the
face 2'9 adapted to engage a corresponding clutch
hub and braking mechanism are the same as in
surface 3.1! in the interior of the hub Il. The Cn the embodiment of the invention illustrated in
opposite end of the member 28 is provided with
Figs. 1 and 2 and are similiarly numbered. In
teeth 3i which are adapted to engage a set of
the present structure, however, a frictional retard
teeth 32 formed on the adjacent-end of the brake
ing member in the form ofÍ an annulus 35 is
expander member' I1.
'
»
anchored to the brake expander I1 in any suit
In order to ensure traversal of the clutch and
able manner as by spot welding or crimping as
brake actuating member 28, detent means is pro
indicated at $5. The annulus is provided with
vided for frictionally connecting said member
elastic arms 3l which extend beyond the expander
with the interior of the hub. As best shown in
I1 and are arranged to bear frictionally on the
Fig. 2, this means comprises aring member 33
cylindrical exterior surface 38 of the clutch mem
mounted on the member 28 andconnected there
ber 28Y so as to apply a slight frictional drag
with in any suitable manner as by spot welding.
thereto.
Ring 33 is provided with arms 34 which are
In the operation of this embodiment of the
.sprung outwardly so as to rub lightly on the
invention forward rotation of the sprocket 'I is
interior of the hub I I to thereby provide a fric
transmitted through the driving member 6 to the
tional connection therewith.
v20 screw threaded extension 26 thereof, and since
In operation, forward rotation of the driving
the clutch member 28 is initially preventedfrom
rotation by the retarder 35, it is translated longi
the clutch >member 28 to-be> urged to the left in
tudinally to the left into engagement with the
Fig. 1 to close the clutch 2S, 36 betweensaid clutch
clutch surface 323. in the interior ofv the hub II.
member and the hub I I whereby the hub is caused 25 The rotation of the sprocket is then transmitted
directly to the hub to propel the vehicle. When ,
to rotate with the driving member E. When the
operator stops rotating the driving member,
the rotation of the sprocket 'I is arrested, the
further rotation> of the hub IIv by momentum
rotation of the hub II causes the clutch mem
member 8 in the direction of the arrow a.- causes
causes the clutch member 2,8 to overrun the screw
ber 28 to overrun the screw shaft 26 slightly so as
shaft 25, thus releasing the clutching engage 30 to move to the right` sufficiently to disengage it
ment between the clutch member 2B and the hub.
self from the hub. The hub is then free to over
run or coastY by the momentum of the vehicle.
Further overrunning of the hub l i is transmitted
frictionally through the drag> ring 33 to the clutch
When it is desired to retard or arrest the motion
member thus lcausing it to be traversed to the
of the vehicle, backward rotation of the sprocket
right in Fig. 1 until the teeth SI thereof engage
l rotates the screw shaft 26 backward whereby the
thel teeth 32 of the expander member Il', after
which the clutch member 28 is locked from
rotationby reason of such clutching engagement.
clutch member 28 is translated to the right by vir
tue of the retarding action of the member 35 un
til the dentals 3l 0f the clutch member. 28 engage
the corresponding teeth 32 of the expander Il.
If the> operator should turn the driving mem
ber 5 backward under these circumstances, the 40 Further backward motion of the sprocket 'i causes
the expander Il to be moved to the right to force
backward rotationfof the screw shaft ìd'moves the
clutch memberY 25 further to the right, which
the brake shoes I3 into frictional engagement
with the interior of the hub l I to thereby oppose
motion is transmitted to the expander member
rotation thereof.
i
I'I to thereby expand» the brake members i3, I4
into frictional engagement with the interior of 4.
Although certain embodiments of the invention
have been shown and described in detail, it will
the hub II. Since the expander member Il, and
‘be understood that other embodiments are pos
the brake shoes I3, I4 are non-rotatably connected
sible and that various changes may be made in the
to the anchor member 5 by means of the splines
2 I, 22', the braking torque is transmitted thereby
design and arrangement of the parts without
tothe anchor member 5 and through the arm
23 to the frame of the vehicle. Inasmuch as the
clutch member 28 is moved into engagement with
the expander member I1 as soon as the operator
departing from the spirit of the invention as
stops pedaling as above described, there will be
no lost motion between those parts in the applica
tion ofthe brake, and braking will be initiated
substantially instantaneously upon backwardr
rotation of the driving member 6 by the operator.
member journalled thereon, an anchor member
deñned in the claims appended hereto.
What is claimed is:
,
'
1. In a coaster brake a ñXed axle, a driving
Y non-rotatably mounted on the axle having a lon
gitudinally extending recess therein, a wheel hub
journalled on the driving member and the an
chor member, a split sleeve brake member
The inclination of- the cones I5 and I3 is such »
formed to engage the interior of the hub, anex
that when the longitudinal pressure of the mem 60 pander for the brake sleeve slidably mounted on
ber Il is relieved by the operator, the surfaces
the axle and havinga longitudinally extending
readily disengage without sticking. This result
is facilitated 1by` the described arrangement in
which the conical surfaces of the members 5 and
I'I« substantially ñt the internally ñared ends of
l recess in alignment with the recess in the anchor
abutment formed by the end of the screw shaft
26 holds the expander 4member I? in proper en
member, a straight key slidably seated in said
recesses and non-rotatably engaging the brake
sleeve to thereby prevent relative rotation be
tween the expander, brake sleeve and anchor
member, and a clutch and brake actuating mem
ber threaded on the driving member for longitu
dinal movement thereon alternatively into en
gagement with the keys 2I, 22, .and prevents the
expander from adhering to’or following the clutch
pander.
. the-brake members at the time the brake members
are expanded into engagement with the hub. ' The
member 28 when it moves to the left to engage
gagement with the hub or with the brake ex
2. A coaster brake as set forth in claim 1 in
which said driving member is arranged to en
In Figs. Sand 4 of the drawings there is illus
gage the expanding member and forni an abut
trated an embodiment of theinvention in which 75 ment therefor on the axle to limit the sliding
and drive the hub.
2,410,785
É
movement of the key in the recesses of the ex
panding member and anchor member.
3. in a coaster brake an axle, an anchor mem
ber adjustably mounted thereon, means pre
venting rotation of the anchor member, a driv
ing member rotatably mounted on the axle, a
wheel hub rotatably mounted on the drivingr
member and anchor member, a clutch member
threaded on the driving member and movable by
forward rotation of the driving member into driv
ing engagement with the wheel hub, a sectional
brake sleeve in the hub formed to Íit the interior
6
the hub, a clutch and brake actuating member
threaded on the driving member in position to
engage the conical clutch surface and rotate the
hub, an expanding member for the brake mov
- able by the actuating member upon backward ro
tation of the driving member to apply the brake,
and a key slidably seated in the anchor member
and expanding member to form a spline connec
tion therebetween and traversing the brake sleeve
to thereby form an abutment preventing rota-tion
thereof.
6. In a coaster brake, a fixed axle, a driving
member journalled thereon, an anchor member
thereof and having conical openings in its ends,
non-rotatably mounted on the axle having a plu
an expander member slidably mounted on the
rality of longitudinally extending recesses there
axle in abutting relation with the driving mem
in, a wheel hub journalled on the driving mem
ber, said expander and anchor members having
;ber and the anchor member, a brake applying
conical portions fitting into the ends el? the brake
member slidably mounted on the axle and hav
sleeve, and having longitudinally extending re~
ing longitudinally extending recesses in align
cesses in said conical portions, and keys slidably
ment with the recesses in the anchor member, a
seated in said recesses and longitudinally trav
plurality or" braking elements between the an
ersing the spaces between the sections of the
chor and brake applying members for frictional
brake Sleeve, thereby iorminga splined connec
ly resisting rotation of the hub, means for trans
tion between the anchor member, the expander
mitting the braking torque from said elements
member and the brake sleeve.
4. A coaster brake as set forth in claim 3 in 25 to the anchor member including a plurality of
straight keys slidably seated at their ends in said
which the clutch member and expander member
aligned recesses and non-rotatably engaging the
are provided with dental clutch faces engagable
braking elements, and a clutch and brake actu
by backward rotation of the driving member, and
ating member threaded on the driving member
including iurther means for applying a frictional
drag on the clutch member to insure its traversal 30 for longitudinal movement thereon alternatively
into engagement with the hub or the brake ap
in response to actuation of the driving member,
plying member.
said driving member being arranged to engage
7. A coaster brake as set forth in claim 6 in
the expander member and form an abutment on
which the braking elements, the keys and the
the axle which limits the sliding movement of
f recesses in the anchor member and brake apply
the expander member thereon,
ing member are so formed and proportioned thatl
5.,In a coaster brake a wheel hub having in
the braking elements and keys are free to move
the interior thereof a conical clutch surface and
longitudinally during the application of the brake
a cylindrical braking surface, a driving member
and thereby adjust themselves to avoid localized
journalled in one end of the hub and an anchor
member journalled in the other end, a brake 40 pressure.
E. ELLIOTT HOOD.
sleeve member within the cylindrical portion of
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