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June 10, 1947.
J. NORSTROM ET AL
2,422,121
FLUID PRESSURE OPERATED BRAKE AND ADJUSTMENT THEREFOR
Filed Aug. 10, 1945
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INVENTORS
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Jasep? ZVbnsL’ram
By Ali/in 5.6372216
ATTORNEYS
June 10, 1947.
_J. NORSTROM ET AL
‘ 2,422,121
vFLUID PRESSURE OPERATED BRAKE AND ADJUSTMENT THEREFOR
' ' Filed Aug. 10, 1945
'4 Sheets-Sheet 2
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IN VEN TOR S:
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By Alvin L. Jmz'l‘k
'
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ATTORNEYS‘
June 10, 1947.
J_ NQRSTROM ETAL
2,422,121
FLUID PRESSURE OPERATED BRAKE AND ADJUSTMENT THEREFOR '
Filed Aug. 10, 1945 '
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4 Sheets-Sheet 5
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IN VEN TOR S
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ATTORNEYS
June 10, 1947.
2,422,;21
J. NORSTROM ET AL
FLUID/RRESSURE OPERATED BRAKE AND ADJUSTMENT THEREFOR
Filed Aug. 10, 1945
4 Sheets-She/ét 4’
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INVENTOR 5
Josep? Mrsl'raw
4W4, M v» M
ATTORNEYS
Patented June 10, 1947
2,422,121
UNITED STATES PATENT OFFICE,
2,422,121
FLUID PRESSURE OPERATED BRAKE AND
ADJUSTMENT THEREFOR
Joseph Norstrom and Alvin L. Smith, Newburgh,
'
N. Y., assignor to Muskegon Machine Company,
Newburgh, N. Y., a corporation of Delaware
Application August 10, 1945, Serial No. 610,040
8 Claims. (Cl. 188—79.5)
1
2
This invention relates to fluid-pressure oper
ated brakes and, more particularly, to adjusting
mechanism therefor.
In braking apparatus, the clearance between
tailed description given below taken in connec
tion with the accompanying drawings forming
a part of the speci?cation and illustrating, by
way of example, one form of apparatus which
the brake drum and the shoes which carry the '
maybe used in carrying out the invention.
brake lining is an important factor in obtaining
an even torque. This is especially true of brakes
in which the braking torque results from pres
sure exerted by expanding bellows or diaphragms
invention resides in such novel features, arrange
ments, and combinations of parts as may be
shown and described in connection with the ap
paratus herein disclosed.
on the respective brake shoes.
When a very 10
The '
In the drawings,
,
Fig. l is a view of the braking apparatus taken
slight clearance is accurately maintained be
tween the brake drum and the brake linings, the
along the line I—I of Fig. 2;
.
r
-
Fig. 2 is av side elevational view, partially in
bellows movement may be kept to a minimum
section, of braking apparatus, constructed in ac
with the result that the wear of the bellows is
considerably reduced and a more even torque is 15 cordance with the invention; '
Fig. 3 is a sectional elevational view of one {of
obtained. It is important that this clearance be
quite accurately adjusted upon installation of the
brake.
the brake shoes;
"
'
Fig. 4 is an inverted plan view of the outer sec
Moreover, as the brake. linings are worn
tion of one of the brake shoes; _
;
down, it is desirable to adjust the clearancerbe
Fig. 5 is a sectional View taken substantially
tween the linings and the drum to compensate 20
along the line 5-5 of Fig. 1;
for the lining wear.
Figs. 6 and 7 are plan views of the inner'sec
With the apparatus of this invention, the clear
tion of the brake shoe showing the parts in differ
ance between the brake linings and the drum
ent positions, respectively; and
may be easily adjusted in a very short time with
}
~_'
Figs. 8 and 9 are somewhat diagrammatic views
illustrating certain features of the invention.
any parts of the brake mechanism. Consequent
‘One suitable form of brake assembly will first
ly, the clearance between the brake drum and the
be described of a type adapted for various indus-r
linings may be periodically checked and easily
trial purposes, and utilizing four of the adjust
adjusted to secure a minimum motion of the bel
lows. Moreover, the brake may be adjusted so 30 able brake shoe arrangements in accordance with
the invention. However, it will be understood
that a uniform clearance is accurately main
that the features of the invention may be used
tained between each‘brake shoe and the drum
in connection with various other types of brake
even when a large number of brake shoes are
assemblies for a variety of-purposes.
_
7‘
utilized. One way of accomplishing this result is
Referring to the drawings in detail and par
to utilize a two-section brake shoe assembly, the
ticularly Figs. 1 and 2, the braking apparatus
inner section receiving the pressure exerted by
may comprise a base I9 which supports a suit‘
the bellows ‘and transmitting this pressure to the
out removing the brake drum or disassembling
outer section which is in contact with the brake
25
able frame- Ii, having bearing blocks I2, I2
mounted thereon. A shaft I3, to which a brak
between such inner and outer sections may be 40 ing torque may be applied in the manner herein
after described, is journaled in the bearing blocks
readily adjusted by a relatively simple and im
I2, I2 on bearings I4, I4, respectively. A sleeve
proved form of mechanism, to thereby vary the
I5 is secured to the shaft I 3 by suitable set screws,
clearance there-between. The brake‘ shoe of the
oneof which is shown at I6, Fig. 2, the sleeve I5
invention is of rugged and durable construction
so that it will require little attention for proper 45 having a web IT formed integrally therewith
drum.
According to the invention, the spacing
maintenance.
'
Brake shoes, according to this invention, are
which, in turn, is integral with a cylindrical brake
drum I8.
A housing 19 is supported in any suitable man
also constructed so that they may be easily re
ner as by members 20 which may be ?xed to the
moved from the brake housing for relining or ad
justment. When the shoe is removed, the other 50 frame I I and extend outwardly in a, generally ra
parts of the braking apparatus, such as the bel
dial direction with respect to the shaft I3. As is
shown best in Fig. 1, the housing I9 substantially
lows, are readily accessible for inspection or re‘
moval.
'
surrounds the brake drum I8 and is separated
Various other objects, features and advantages
therefrom by clearance gaps as at ZI. The hous
of the invention will clearly appear vfrom the de 55 ing I9 is provided with an inlet as at 22 and an
2,422,121
3
4
outlet as at 23 so that air or other cooling medium
may be passed into the inlet 22, thence in a gen
A conduit 48 conducts the air to another sleeve
42 for the lefthand diaphragm. The third port
erally counter-clockwise direction, Fig. 1, around
of the three-way connection 45 is connected by
the brake drum l8 and out through the outlet 23.
a conduit 49 with the sleeve 42 for the right hand
If desired, the outer surface of the brake drum 5 diaphragm, which, in turn, has a conduit 50 ex
may be corrugated as indicated at 24,'Fig. 2, to
tending therefrom to the sleeve 42 for the bot
.tomzdiaphragm. .AccordinglYnthe air passes from .
facilitate cooling @ thereof as the : braking eopera
asupplyiline 45r1into each .of .the sleeves 42 and
A brake shoe support 30, Figs. 1 and 2, is pro
thence through the 'pipes 4! into the respective
vided to support any desired number of brake 10 obellows 40.
shoes is in proximity to the inner surface of the
It will be understood that the air supply may
brake drum 18. In the example;shownythereeare
joe'icontrolled inany well known manner so that
four brake shoes S spaced at 90 degrees-around
*the'bellows 40 may be in?ated or de?ated to the
interiorly of the brake drum ‘l8. EE'he brake shoe
desired=extent when-‘operating the brake.
support 30 may comprise aipair ~of.\-spacedlé‘plate
FGneeofthe brake shoes S is mounted on each
memlbers 3|, 3| disposed, respectively, radiacent
:of tthefibellowsi'w,seach brake shoe S comprising
opposite ends of the brake drum 1.8, Fig. 2. Each
an inner or shoe section 55 and an outer section
plate member 3| comprises a generally circular
or'braking section‘56, Fig. 3. The inner section
peripheral portion 32 which is closely spaced'with
55¢.rnayic'omprise a ?at base 58, Figs, 6 and 7,
respect to the adjacent'inner surface or rim of 20 which is adapted to rest upon the associated bel
.the'brake drum l8. .Blates 34am disposed-be
lowsv 40. _Wa11s 7. as ;at A59 .extend .alongeach-yside
tween the platememrbersii and 3 l ,eachplate. 34
.of-thebasg?andmay be integral therewith, each
being abrazed or .otherwise suitably secured to
side wall 59 having taperedends as indicated at
tion
proceeds.
'
.
'
?anges .35, .Fig. .2, -. formed on .the ..plate .members
‘603, :Fig. 3. :A .pair .of . slidesliv l,» 62 . are ‘mounted
s3l,vre_spec.tively. .=~The plates-34 form a passage .25 .betweenathetside ~Walls .59, 5.9, .bothof saidislides
.34’ ‘which. may “be:substantiallysquare .in itrans
resting ton “and [being .movable. longitudinally .of
Lverse. section, the. shaft .l3:.extending throughthis
l-thebase 58. Thezfacingendsof theseslides are
passage. :Each. of the splatemembers "3 I -is .aper
.cut .away .to T'form gUrshaped ~.and. oppositely
tured as indicated at 3l’,_thes.e>vaperturesihaving
directed .recesses ~63, $63, mespectively, which .are
transverse con?gurations corresponding With that 4. ~<symmetrical:witnrespect-tothe. side Walls .59, 59.
.of 11311.81 aforesaid passage .34 f .
.One 1» end .of a . linkr?? .is .pivoted .tovslide J5 l ‘as -.at
Accordingly, it will be-appa-rent that .the .‘brake
.ShOBrSllIJjDOT'b .-3ll'- comprises the .platemember-s? I ,
.55, the-:othenendof link 64.being_.,pi-voted..as.,at
r66 ,to-a ,yokeJi‘l which; is .pivoted .toth-e ‘base 58
.3-l~.a,nd;:plates>34 .which form a rig-iddmitary struc
sasat??.
ture. Each of the .plates;34,TFig. =1, .is-adapted P35
?to support ' one .of the .brake .shoes .8 . in '~ desired
closely spaced position relative to.the rinrofthe
.brake drum‘ 48 as ;will be .more .fully .described
hereinafter. In order stoisecure the .brake shoe
support 30 .-to the frame .I.l,:a sweb diivmay be ,_,
brazed or otherwise--suitably-.securedtothe{inner
surface'of the left .handplateimember 3 I ,Fig. 2,
said web 55, incidentally, partially -:closing the
aforesaid aperture 3!’ ‘3016111116 ,plate ‘member .31
'
‘
.Oneend of. alink .69.is,pivoted.to..the.,slideLE2,
.as at .10, .,th'e. other ,endof ilink -.6.9 ‘being ,pivoted
,totthe yoke =61 .as at‘!!! . vThefyokeli'l -is slotted
{as \at .‘L'Lto ‘receivaapin .13 .which .is..'r'n'ounted..on
.a ,nut .member =14, ..the ,lower vsurface of which
rests.onwthesyokec?fl. .A boreJ5¢eXtends transversely through the nut member 1.4,this qbeing
internally threadedtoireceivei anadjustingscrew
.Idwhich is .-rotat.ably;mounted.in .theside walls
.59. rSuch adljustingsscrewimayrbe provided with
<last .noted, randibeingeshaped .to. form- a central
passage :3], Fig. :1, which is of .sumcientnsize .-to
receive .freelyfthe shaft 13. The Web-3'6; is. secured
' ,slottediheads at bothiends thereof toreceive .a
.to.»the frame :H \byisuitable .-s.crews..38 vtar-thereby
in :Fig.-~ 6, the adjusting screw-‘l6 ;may he \;turned
screwdriver or other -_suitable .tool. Assuming
that ,the slides 461, P 6.2 uare :in the ‘position .shown
.holdi-said'web .36 together with the .brake sshoe
so -:as ‘to -.move the ‘nut =member 14 ‘upwardly,
support, 30 in ?xed position-upon .vtheiframe H .
,thus swinging‘ the -:-yok~e~6.-1 in ;-a counterclockwise
.Eachpof ,the;plates~:34 supports a bellows. or dis.- ‘
:phragm ‘4.0, Fig, '2, to which .-is..connectedra-pi.pe
All-extending athroughra :sleeve 4.2 mountedina
suitable boregformed in .the “central .portioniof
,thamijacent-p-late 34. _».Each .pipei4 Iris provided
direction, -:Fig. 7-6, and -mov.ing the slides -.,GI, .52
away from-each .-other<.i1oward,p.ositionseaszshown
.in,Fig'..7. Obviously, when the.<adjusting screw
5&6 turned :so {as :to shove .the nut member :14
' .downwardly,>_Fig: 7,».the ireuerseiactiontoceurs'and
=with <a,=.plurality - of hores= 43 which. communicate
.with the interior of, the surrounding sleeveillyand
each-sIee-veJII-Z is,provided(wit'h azcapr44 ‘to close
the end thereofoandprovide access-to cthetpipe
The :slide .51 has -.a @pair-of integral ,parallel
iwedge-shapedrportions 80,:80 {formed-at». opposite
sides thereof, respectively. Each #portion 847 ':has
.41 . When-,thebrake drumhl?rand vtheJorake shoes 60 an inclined upper surface . 8 I, Fig. 18, :andthese
Snare ,removed in --.the manner hereinafter de
scribed;. one ormoreof- the caps_d4,1to which-access
mayghe had, .after, removing theiorake. _drum,~may
she .removed- whereup on oneor-more oftthe bellows
A?qmayrbeliftedsout forreplacement or adjust
ment.
It will be apparent that the sleeves 42, which
extend-through, the respective plates v.34, care . lo
cated above-below ‘andrat both. sides of -. the .sh aft
inclined surfacesaaretdisposedin acommon; plane.
The iupperjportion of :zeach :inclined ‘surface :8!
may,~if~.desired,-mer,ger intoiawshortghorizontalgpor
tiom8l ' which‘ is;-locat_ed1at“the :‘GIId. of thexnem
ber ~80 -.nearest {the yoke ~:6-1. “Another pair 101
wedge-shaped portions 82, 82 may beiformedgin
stegrallywiththeaslide ?izat:opposite'ssidesithere
of, respectively. 'Themortions .82, ~§82 :havewin
clined :surfaces 2&3, a855,:respectively, which vmay
l3, .Fig. “1, respectively. v.Ainmay .besnpplied .to 7.0 merge iintoihorizontaliaportions r83’ ~.>at the-upper
each of ithellbellows 40 .through a supplylineAB
vrend atheléeof. vThe xmeclg'ee-sh-aped ‘members $5
which communicates .with. one port in a three-way
and-:82gareronpositely directed and arerpreferably
,con-nection :46. .A' conduit 41 .connects;a.-second
located the same distance from the adjacentside
port 2: of the = three-\way “connection '46 with .the
»wall-59.
sleeveAZ ‘for'the upper. diaphragm‘. (Figs, 1; andgZ). :15 ;'_I,‘he outensectionridof each'brake ,shoe'sS com
2,422,121
5, at either side of the brake shoe thus permit
ting the outer section 56 of the upper brake vshoe
to be lifted out; If desired, at this time, the
inner brake shoe section 55 may. be removed by' a
prises‘ anarcuate 'platel'segment 84 which has
the same curvature as the rim of the brake drum
I8,.Fig. 1. A brake lining 851 of'asbestoscompo
sition or other suitable material is secured to
the outer surface of the plate segment 84 in ‘any
mere lifting action to allow access to ‘the'Iass'o-I
ciated bellows. When the'desired adjustments
have been made, the inner section 55" is again
placed upon the bellows and the outer section 58 is
placed in position'on top of the inner section 55.
are drilled at the middle thereofto form the re
spective slots‘ 81, Fig; 5, within which is received 10 Thereupon, the spring 89 is again' depressed and
the rodv 88 vmay be replaced. The spring 89 is
alrod 88'extending transversely of the outer sec
suitable manner. A sidewall 86' extends along
each side of the arcuate plate 84 and may be
formed integrally therewith; The side walls 88
then released whereupon it snaps into engage
ment with the recessed portion 98 of the rod 88.
Accordingly, it will be apparent that the upper
tion 56. A leaf spring 89 ?ts in an annular re
cess 98 formed in the central portion of the bar
88, and the spring'89 is supported at each end
thereof by a member 9| which is suitably secured 15 brake shoe may be Very easily and conveniently
removed for adjustment or for relining. . 'Ob
to the arcuate segment 84 as by a screw’ 92. The
viously; the remaining brake shoes may be v‘re;
spring 89 serves to retract the brake shoe from
movedin similar manner.
"
engagement with the drum as will be hereinafter
The operation of the brake will now be brie?y
described andv said spring 89 also serves to‘ pre
vent the rod 88 fromslidingtransversely of the
outer‘section 58 when the spr'ing‘engages the re
cessed-portion 98 of the rod 88.
'20
described. It will be assumed that a bellows and
a brake shoe are in position on each of the plates
34 and that the shaft I3 is rotating. Whenit is
desired to apply a braking torque to the shaft, air
under pressure is supplied to the air line 45-thus
the brakeillining 85 and arcuate segment 84, this
passage‘ being slightly offset with respect to 25 causing all of the bellows 48 to expand and press
the respective brake linings 85 against the interior
the center of the brake shoe. A suitable tool may
of the drum I8 to thereby apply a braking torque
be inserted through this passage to depress the
to the shaft I3, each brake shoe moving radially
spring‘ 89 and move same out of the recess 98
outward against the pressure of the spring 89
when it is desired to insert or remove the rod 88
for reasons hereinafter explained. ’
y
30 associated therewith. When the bellows are de-v
> As shown in Fig. 3,' a passage 93 is formed in
' Referringeto Fig. 4, a‘ pair of portions ‘I88,
I 88 'may be formed integrally with the arcuate
segment 84 at the left hand side of the brake shoe.
The portions~I88 have inclined surfaces I8I, re
spectively, which are-adapted to engage the re 35
the springs 89 retract the respective brake shoes
whereupon the brake linings 85 are moved‘radially
inward away from the brake drum and no brak
ing torque is applied thereto. It will be apparent
that the brakingvtorque is applied ‘over substan
tiallythe whole circumference of thevdrum I8
spective inclined surfaces 8| on the wedge-shaped
portions 88. A pair of like portions I82, I82 may
be formed integrally with the arcuate segment
84 at the right hand side of the brake shoe.
Portions I82, I82 may be provided, respectively,
?ated by exhausting the air from the line 45,
so that a very even braking'torque is obtained and
excessive wear of the brake lining is avoided.
40
If the temperature of the brake lining vrises ‘to
with inclined surfaces I83, Fig. 8, which are
approximately 500° ’F., the brake drum should
adapted to engage the respective inclined surfaces
be cooled in the manner hereinbefore described by ,
83:01.1 the, wedge-shaped members 82; e
As previously stated, one of the brake shoes
S is supported upon each of the bellows 48, all of
which, in turn, may be supported against the
passing air or other cooling ?uid around the outer
respective plates 34; As’shown best by Fig. 5,
surface of the brake drum through the housing I9.
In accordance with the invention, the clear;
ance I86, Fig. 1, between the brake drum I8 and
the respective brake‘shoe S may be adjusted
the inner section 55 of each brake shoe may be
retained between the plate members 3I, 3| with
the base 58 in contact with the outer surface of
the bellows 48. The adjusting screw '16 on each
brake shoe may be received in slots I85 which
without removing the brake drum. This clear
ance may be readily and accurately adjusted
are formed in the‘respective plate members 3I.
brake drum. The adjustment of the clearance
when the brake is ?rst installed and periodical
adjustments may be made to maintain the opti
mum clearance between the brake shoe and the
I88 is effected by means of the adjusting screw
_ The outer section 58 of each of the, brake shoes
is positioned and rests upon its complemental 55 16 for each brake shoe S and the method of mak
ing such adjustments'will now be describedin
inner section 55 with the portions I88, I82, Fig.
8', in engagement with the wedge-shaped portions
88, -82,._respectiv'ely. When so positioned, the
brake lining 85 is closely adjacent the brake
drum I8, the clearance between the lining 85 and
the drum I8, which is indicated at I85, (Fig. 1)
detail.
It will be assumed that the inner sec
tion 55 and outer section 56 of the upper brake
shoe S are in the respective positions shown in
Figs. 3 and 8 with the wedge-shaped portions 88
and 82 in contact with the portions I88 and I82,
respectively. In thisposition, the distance be
tween the middle of the base 58 and the'outer
.008 inch. When the brake shoe outer sections
surface of the brake lining is indicated at D,
56 are positioned as described, the rod 88 of each
brake shoe extends through ‘suitable, passages 65 Fig. 8. The adjusting screw 16, Fig. 6, may be '
turned so as to move the slides BI, 62, Fig. 8,
I81, I81 in the respective plate members 3|‘, so
farther apart whereupon the portions I88 and I82
that each rod 88 is supported in ?xed position
are forced upwardly, surfaces of portions 88 and
relative to the brake shoe support 38.
82, sliding thereover respectively, for example, to
‘Whenit is desired to reline or adjust one ,or
the positions shown in Fig. 9. It will be ap
more oi‘v the brake shoes, the brake drum I8 is
parent that the distance D becomes greater as
removed and a suitable tool is inserted through
at’D’ in response to this adjustment, with the
the passage 93, Fig. 3, to force the spring 89 down
result that the brake lining 85 moves closer ‘to the
wardly out of engaement with the recessed por
I‘lm_'()f theqbrake drum, and the clearance I86
tion of the rod 88. Thereupon, said rod88 may be
preferably beingfrom about .005 inch toabout
moved out through the passages 81 and I81, Fig. 75
becomes smaller.
‘
‘
~
8
7
shoesforycooperatingiwithsaid:siidieemembersiqa '
~ 'Whenrthe. adjusting: screw 1 1.6:‘ is turned so as
tormovefthesslidesu?il ; :62 toward ‘each 2 other; 7 the
yokezmounted'upon .sai'di?uids pressure operated '
reverse-action occursand the portions: Tllllhand
means‘. intermediatev said} slide: members, .‘m‘eans
:l 02;‘ Fig. i 9,: movedownwardly; :since; the, surfaces
operatively connecting saidiyoke to: saidvsli?e
ofportions: 80' andLBZ slide inwardly. 'Tliereupon,
the; brake-lining: 85'; moves-away from ‘the =brake
members; and : means'for “controlling the angular
and the ‘clearance: I 06? is increased.
In . this’ manner,. "a very‘ ?ne adjustment‘ may
position-‘of saidiyoke whereby said slider-members
may be moved toward or ‘away from'i‘oneanother
to vary the : distance rb'etween:1=sai'déshoef ‘andésai'd ~
?uid pressure-operatedrmeans:
L
l
obtained of the clearance between‘ the‘ brake
shoesand the drum and thisclearancemay'b'e :10
3; In a brake construction; a brake shoe ' com
prising; an‘ inner section ' having; va‘: pressure ere’
:kept. to the minimun'r so thatrthe expanding'
movement of thebellows iszconiinedwithin nar+
ceiving surface, apair of? slide-members mounted
row'zlimits. It will ‘be. further apparent: that: a
upon said surface, each. of ‘said vslide members
comprising a wedge, the ‘wedges on-saidmembers
uniform clearance may be ' accuratelymaintained
betwweenzeach‘ brake ' shoerandlthe brake?rum: so 15 being oppositely directed, a yoke-member: pivot:
that aivery- even braking: torque ‘may-be obtained;
ally mounted on said.- press-urie. receiving; surface
Moreover, the adjusting: screws ‘are readily: access
intermediate said slide-~members; a~ pairpf: links operatively associated; each with-v an» opposite exe
sible from either endrofi thebrakelso that‘ this
clearance may be-adjust'edfwithoutremoving the
brake drum or‘ disassembling the brake *in'any
manner. The correct clearance llmibetweenat'he
brakelining- ~8l5'~a~n‘d¢‘ the brake drum" I'8' may be
conveniently ‘obtained by" temporarily inserting
asliim having a thickness corresponding to the
desired‘ clearance.
V
Y
1'
It will further'be apparent‘ that» the. brake is
of.- a» very rugged" and. durable construction‘ re-‘
tremity of said yokemember vand interconnecting
said'yoke an
members,
member-t
adjusting
with’respective
screw’ havingofwsaidia traveling
slide
nut thereon,‘ said‘; nut: being operatively- assoei-.'
ated with said:yoke;zsaidrscrew‘being- accessible‘ ,
from the side of said.- shoe and» mounted; upon
25 said‘ pressure‘v receiving- surfaicef-and _ adaptedior
controlling the angular position of. saidryoke;
said brakeshoe further comprisingrancutersec- '
tion having a braking surf-aceadapteel to engage
quiring only low maintenance costs, ' Also, the
a: brake drum,said outer section-havinggwedge
only moving parts of the brake which require 30 members adaptedirespectively toengage the op- ‘
lubricationarethe threads on-the adjusting screw
positely directed wedge-members mounted-upon
1.6» and. nut-member 14. By- making periodic ad
said slides, the‘ relative. movement between.’ said
justments to. maintainithe proper clearance bee
wedges being effective-to-move said: outer wedge
members thereby to increase or decrease-the diss
tween the brake shoes- and the brake drum; the
life of each bellows is-eX-tended and same will 05 tance‘ ‘between said . pressurerceiving surf ace and
only n'eedto ‘be replaced at infrequent intervals.
"Whilethe: invention has been described with
respect to a" certain-particular preferred example
which‘ gives satisfactory.‘ results, ‘ it- will‘ be under
saidbraking
4'. In a fluid,
surface.
pressure-operated
7
V brake-khaving-ga
r .a
'
brake drum, a plurality» of brakeshoes, a support
for maintaining said. brake shoes :in operative
relation with said: drum, each of: said-brake “shoes
stoed=by thoseskilled in-the art after understand
ing, the inventiomzthat ‘various changes andmodi
?cations' may bev made without departing from
the spirit and-scope-of the invention’ audit is in
comprising an inner section’adaptedrtoebemoved
toward the brake drum, said inner-section carry:
tendedtherefore in-t-h'e appended claims-to cover
member pivotally mounted intermediate said‘
allisuch, changesand-modi?cations;
V ‘
What'is-claimed' asnew' and desired to in se
cured‘ by Lettersv Patentis:
‘1r Inga: brake construction; a brake shoe com?
ing a plurality of sets of wedgingfportionsaayoke a
wedging portionsglinks ‘operatively interconnect
ing opposite extremities’ of said‘yok'e. t'oJrespem }
tive of said wedgingportionsa threadedfadiust
ing. member having a’ nut thereon. operatively.
prisingv an- outer section having a- brake lining
connected to saidyoke whereby angularadjust-~
adaptedto engageabr-ake drum, an’ inner: section
ment of said threadedmember. thegdistanoe be
having a; pressure-receiving: surface, a leaf spring
tween: said’ wedging portions may be . increased‘ or I
mounted on said“ outer section, said brake shoe
decreaseds said’threadedadiusting, member being
accessible from the side ‘of said brake shoeeacli
being formed to-receive a longitudinally slidable‘
of said “brake shoes ' further.‘ comprisingian outer
supporting; rod, the ends- ofusaid rod normally
extending-outwardly from'the'sides-of said brake 55 section movable towardjthe brake drumfwith said
inner section, each of said‘ outer sections come-v
shoe, said rod, being provided with an annular
prisinga‘brake lining adapted to. engage and ap-v
recessedportion. adapted to receive said leaf
ply a braking torque tosaid brake drum, aplu
spring to lock therodin- ?xed transverse position
rality of wedge members adapted respectively ‘to
with, respect to the brake shoe, said- outer section
and said brake lining being shaped to form a 60 engage said sets-of wedging portions onithe asso:
ciated inner. section; so that angular motion of
passage. through: which a. tool may be inserted
the threaded adjusting member on each brake?
te-move said leaf spring out-of said annular re
cess so thatzthe rod- may be: removed.
'
shoe. is effective to adjust, the rpclearancebetween‘
.2.v lnra fluidpressure operated brakelhaving av '65. the associated‘ brake lining and the‘brakedruma
biiakadrum, meansfor supporting, a- brake shoe‘
in operative relation with respecttoIsaid drum,
saidl brake- shoe having an-Yarcuate surface. of
substantially the’ same curvature as» said brake
5;‘In a, brake construction, a'brake shoe corn
prising an‘ outer sectionthavi'ng abrake lining
adapted to engage a brake drunu an inner section '
having a pressure receiving surface, alea'f spring. 7
drum, fluid- pressure operated'means‘ for- moving
mounted on, said‘ outer section, said‘.'lriral'reshoe~
said shoe-toward thedrum'so as to apply a-‘brak 70 being formed to receive a' longitudinally s'lidable ’
ingttorque tosaid drum, a pair of slide-members
supporting rod,’ said rod beinguprovided'lwitlna
mounted. on said?uid pressurev operated means,‘
recess. adapted to receive said learf'springitolock
said slide members comprising wedges for coop
the rod invl?xed transyersepositibn'with respect
erating with said shoe to move the latter toward
to, the brake shoe, said. outer section, and. said
or away from said drum, wedge vportions. on'said 7,5 bra-lie lining, being" shapedljtoformr a‘jpessagg V
2,422,121
10
through which a tool may be inserted to disengage
said spring from said recess so that the rod may
‘be removed.
6. In a ?uid pressure operated brake having
a brake drum, four or more brake shoes substan
tially equally angularly spaced, a support for
maintaining said brake shoes in operative relation
with respect to said drum, each of said brake shoes
comprising an inner section adapted to be moved
toward the brake drum, a plurality of wedge
members slidably mounted upon said inner sec
for resiliently urging said outer section toward
said inner section, a pair of slide members mount
ed on said inner section, said slide members com
prising wedges for cooperating with said outer
section, wedge portions on said outer section for
cooperating with said slide members, means for
controlling the relative position of said slide mem
bers whereby in cooperation with said spring said
outer section is movable away from or toward
said inner section, said leaf spring being effective
yieldingly to retract the brake shoe from the brake
drum when no braking torque is being applied
to said brake drum.
tion, a yoke member pivotally mounted upon said
inner section, means for operatively interconnect
ing said yoke and said wedge members, said means
8. In a brake construction, a brake shoe com
being so constructed and arranged that angular 15 prising an outer section having a brake lining
motion of the yoke moves said wedge members
adapted to engage a brake drum, an inner section
relative to said inner section, a threaded adjust
having a pressure receiving surface, the sides of
ing member operatively associated with said yoke
said outer section being slotted slidably to receive
for controlling the angular position thereof, said
a supporting rod, a leaf spring normally operable
threaded adjusting member being accessible from 20 to lock said rod in a ?xed transverse position with
respect to the brake shoe and manually releas
the side of said brake shoe, each of said brake
shoes further comprising an outer section mov
able to permit removal of said rod, said leaf spring
able toward the brake drum with said inner sec
engaging said rod and said outer section yield
tion, each of said outer sections comprising a
ingly to urge said outer section toward said inner
brake lining adapted to engage said brake drum, 25 section, wedge means mounted upon said inner
a like plurality of wedge engaging members
section and adapted for movement relative there
mounted upon said outer section and adapted re
to whereby said outer section is movable toward
spectively to engage said wedge members on the
or away from said inner section in response to
associated inner section, so that angular adjust
said relative movement of the wedge means and
ment of the threaded adjusting member on each 30 in response to the yielding action of said leaf
brake shoe is eifective to adjust the clearance be
spring, the latter being effective to retract the
tween the associated brake lining and the brake
brake shoe from the brake drum when no braking
drum.
action is applied to said brake drum.
7. In a brake construction, a brake shoe com
JOSEPH NORSTROM.
prising an outer section having a brake lining 35
ALVIN L. SMITH.
adapted to engage a brake drum, an inner section
REFERENCES CITED
having a pressure receiving surface, the sides of
said outer section being slotted to receive slidably
The following references are of record in the
a supporting rod, the ends of said rod normally
?le of this patent:
extending outwardly from the sides of said brake 40
UNITED STATES PATENTS
shoe, a leaf spring normally operable to lock said
rod in ?xed transverse position with respect to
Number
Name
Date
the brake shoe and manually releasable to permit
1,780,200
Linderman _________ __ Nov, 4, 1930
removal of said rod, said spring being adapted
2,155,221
Farmer ___________ _.. Apr. 18, 1939
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