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Патент USA US2009106

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July 23, 1935.
Filed Oct. 16, 1930
24 32 22
New July 23, »=.19.35. »
v‘2,009,106 '
v Q " Allen 0, Chambers, South Bend,
assignor to .
BendixwBrake Company, South Bend, Ind., a
corporation of Illinois
Application October is, 1930, Serial
This'invention relates to brakes and is illus
as embodied in an ‘- internal ‘expanding
brake tor
automobile. An 'ObjCCt of the in
vention is to provide a novel anchorage tor the
No. 489,044
of the friction means "is taken 'by-a novel an-i
chorage illustrated as including a pair of oppo
sitely arranged-similar bellcrank levers 20 and 22
arranged one behind the other. and both ful-_
crumed on 'aiix'edpost 24 carried by the backing
5 '
brakev which will be ‘actuated by the torque of plate. The vdownwardly extending arms oi the '
the brake‘to intensify the brake applying force, levers’ 2n»and~l22»are embraced by brackets 25 on
that‘is, to'give a self-‘energizing eilect.
- -'
band I‘ so that the torque oi. the band. when '
:Preierably't'his ‘novel anchorge is" arranged to the
the brake is-applied is transmitted to these down- .'
be operated‘ by the torque of‘the'brake to force wardly extending arms and thence to the anchor 10
against the‘frotatin'g brake drum two post 24.- The other arms oi-thebell‘crank levers
parts‘ of the brake‘v friction means ‘which are engage the'inner face of theiband'll, the endo!
spaced, some'distance apart'so that a‘ consider lever 20 engaging it to the leitloi thev anchor post
, able
'ofthe , friction means
in'Figuresl and 3Ian'd the end 01' the lever 22 '
against the drum with great power by'force ‘de 24
engaging it to the right of the anchor post 24. 15
rlvedvfrom the braking torque. In one arrange
‘It willibe' seen that when the drum is turning
ment‘ which is‘ illustrated in the drawing, the
Figure 1 the ‘hell crank lever 2i]v is
brake iriction device anchors on a iever'agemeans relatively in
ineffective as an anchorage-while'the
which ‘has two parts engaging portions ‘oi the bell crank lever 22 forms the effective brake an
friction device on opposite sides of the anchorage chor and rocks about the anchor post 24 to urge
and which are operated by the torque of the brake the right hand portion of the band ‘I l radially out
to force the corresponding parts of ‘the iriction ward against the drum. This radial‘ movement oi!
device radially against the drum." I prefer to
the band is permitted by the sliding engagement
use‘two' leverage devices in the brake anchorage, of
the brackets 25 with the lower portions 01'. the
one of which is effective when the drum is tum
the drum is turning counter
ing mone- direction and the other of which is levers 20 and 22. It is comparatively ineffective
effective when the drum is turning in the oppo clockwise, the lever 22
as an anchorage and'the lever 20 is operated to
site direction.
Various other objects and features oithe in
transmit the torque of the brake to the post 24
and also to shift the leithand portionv oi the band ‘
vention, including novel and desirablev structural radially outward against the ‘drum.
details, will be apparent iro'mjthe following de
In order also to shift against the calm the
scription of the illustrative embodiment shown
of the friction device“ opposite the end
in the accompanying drawing, in which:
of lever 22 or 20, whichever one is effective, I pro
Figure l, is, a vertical section through the brake “vide a pair of auxiliary levers 26 and 28 operative
aria shew ',_ly enga'sed‘respectively'by the ‘bell crank-levers 20
the novelbrake friction means
i va -' and zzgrna 'flilcrumed-"réspectively on. :a post‘ 31]
L "11.1
" I nounces-‘en
I _ "backing 'plateandia
f its inside the'head" or the brake
gureiz is._a.partial'section"onjthe‘riine
showing ihélnovél
brake cacti
20f ‘mounted on thebackiiis' plate andpassing through
a relatively large'bpening um ‘the
bell crank .
lff‘lgiil-‘e 3 is a p, rtial section
__ on the line
I 3-H: ‘.lever' 22 so'that'it‘ does not interfere with the
' ‘or the ': bell "crank'iiever 122. ‘ ' Return
Figure '2' and showing one oi the leverage devices : movement
springsi'iil ‘are preferably ‘tensioned ‘between; the
of the brake anchorage; and
{our levers 20, 22, 28 and 28 and the inner face
Figure 4 is a view corresponding to part oi.’ of the band “- and urge the entire lever system
Figure 3, but showing a modi?ed formoi leverage
toward its released position.
It will be seen that whenthe lever 20‘ is effective
The illustrated brake includes a rotatable-drum
88 an anchorage and is urging the leithand por
II at the open side oi! which is a suitable support tion
of the band radially outward, it will also op
such as a backing plate i2 and within which‘ is, erate the lever 26 to. urge the righthand portion of
arranged the friction means or the brake, shown the band. radially outward; similarly, when the 50
ior purposes oi! illustration .as a ?exible expan
22 is effective as an anchorage and isgurging
sible band ll‘ laced with the usual brake lining and lever
the righthand portion of the band- outward, it op- operated by means such as a hydraulic cylinder erates lever 28 to urge the lefthand portion or
and pair of pistons it against the resistance of
the band- outward. Thus, in
7 either direction of:
portion. oi’ the '
According to the present invention, f the torque drum. rotation, the entire lower
the usual return spring l8‘.
band i 4 is urged with great force outward against portions of the friction device against‘thedmin
the drum with a self-energizing effect to increase when the drum is turning in one direction and
another means forcing the same spaced portions
the braking power.
the friction device against the drum when the
As shown in Figure 4, instead of the cam sur
faces by which the levers engage, they may be drum is turning in the other direction.
7. A brake comprising a drum and a friction
connected by intermeshing rack teeth.
in combination with two devices arranged
While one illustrative embodiment of the in
side and alternatively operable to force
vention has been described in detail, it is not
my intention to limit its scope to that particular the friction, device against the drum and each
10 embodiment or otherwise than by the‘ terms of the
appended claims.
I claim:
of which devices acts on circumferentialiyispaced'
portions of the friction device.
8. A brake comprising friction means, a pair
1. A brake comprising a rotatable drum and a ‘of spaced pivots arranged adiacent'the friction
friction device engageable with the drum, in com; means, and two lever devices arranged side by 15
side and fulcrumed on_ said pivots and acting on
bination with anchorage means'for the friction
device having a movable part engaged by the] said-means.,.;eachf*lever device comprising two
friction device and taking the torque thereof and inter-engaging, parts fulcrumed respectively on.
which is shifted upon application of the brake said pivots; '
to apply radial force to the friction device simul .2 " 9. Abrakecomprising friction means, a pair of
spaced pivots arranged adjacent the friction
20 taneously at spaced points on opposite sides of means and serving as anchorage means to take
the anchorage.
2. A brake comprising .a rotatable drum and a the braking torque, and ‘two lever devices-ar- '
said pivots
friction device engageable with the drum, in com rangedside byside and fulcrumed
bination with anchoragezmeans- for ‘the friction and operated vby... the b akingltorqiie‘
the applicationof the brake.‘
25 device including apart which takes the torque
from the friction device and which is shifted by
saidf-torque and spaced parts simultaneously op
10. A brake c mprisingfrictionl'meaiis, [pair .
of spaced pivots arranged adjacent the friction
eratedby the ‘shifting thereof to apply force in a means, andwtwo pairs . of;
radial" direction. against spaced portions of the mlcwmedm San-pivots. the
device on opposite sidesofthe anchorage ranged; side by __.:$1é>.the'1'¢0h.' One P611?
aPPIYmKLaOtiOQ-Z on a. plurality of
+3.v Abrake
comprising.- a ' rotatable
‘Y drum and a
friction, means?when .thelbr'ak
~friction device Yengageable therewith, in combina
one dire‘ctionisniii?eethsabss-action on Eaplurality- ‘of parts, er; the fricf
tion'with anchorage means vtaking the torque
35 of the friction device and including two .lever de
vices arranged side by side, one of which is .op
erated by the torque-of the brake when applied
new; 1w
I!!! ' '
“011 means sheaths. bfik'sljis
‘in the
11. A brakecomprising'frictionmeans,
' a’paii'
with the drum turning in one direction to force the
.of spaced .pivots' arranged, adjacent the ‘friction
friction device radially against the drum and the
other of which is operatedby the torque of the
brake when the drum is turning in‘the other
direction to force the friction device radially
fulcrumed on said pivots,,.'the.pairs_ being "ar 40'
ranged side by side thereon ‘and alternatively- op- '
erable to have an applying ‘action on a'plurality
against the drum.
v ,
means, and. two
‘.of' interconnected jlevers
of parts of the friction_m'eans.'.
f ‘
12. A brakeanchorage ‘comprising two pairs
a bell crank lever mounted on said ?xed pivot and . .of interconnected‘ parts, each pair having an an
45 having one arm adapted to serve as the anchor for chor portion engageablewith friction means and
4. A brake anchorage comprising a ?xed pivot,
a brake- friction device and the other arm ar each having. afplu'rality. of ‘portion: simulta
ranged to engage the friction device to urge it neously given' a brake-applying movement by
radially, in combination with another separately
fulcrumed lever engaged and operated by the bell
50 crank lever to force another portion of the fric
tion device radially.
thrust on its anchor portion. -
13. A brake anchorage comprising two pairsof
interconnected parts arranged side by side, each
pair having an anchor portion and a plurality of
5. A brake comprising a drum and ‘a friction brake-applying portions." , ' j
'14. A brake device comprising a bell crank
device, in combination with an anchorage for the
friction device including one lever forcing spaced lever having a torque-receiving portion and an
55 portions of the friction device against the drum applying portion ‘operated by thrust on' the
when the drum is turning in one direction and torque-receiving portion, and a separately-ful
another lever forcing spaced portions of the fric crumed lever also having an applying portion and
tion device against the drum when the drum is 'operatively engaged by the bell cranlr'lever to be
operated by thrust on said torque-receiving por
turning in the other direction.
6. A brake comprising a drum and a__ friction
device, in combination with an anchorage for the
friction device including means forcing‘ spaced
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