close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2398717

код для вставки
April 16, 1946.
R. s. OWEKNS
2,398,717
ANCHOR BLOCK SUPPORTING LEVER
Filed March 1,, 1945
‘l-NVENTOR
‘
'
w
I
"
RUs E
,
‘
\iOWENS‘
Q/
*
BY ' "/W
ATTOR
Y
Patented Apr. 16, 1946
UNITED STATES PATENT OFFICE ~ ‘
ANCHOR BLOCK SUPPORTING LEVER
Russell S. Owens, St. Louis, Mo., assignortoxWag
nor Electric Corporation, St. Louis, Mo., a cor,
poration of Delaware
.
Application March 1, 1945, Serial No. 580,407
12 Claims. (or. 188-178)
This invention relates to brakes for self-pro
pelled vehicles and in its more speci?c aspects is
directed to an improved self-centering mecha
form, partly in section, to show structural de
nism for the shoe elements of the brake.
brake art to eifect a centering of the brake shoes
‘
tails.
’
.‘
‘
'
Various expedients, have been employed in the
One of the objects of the invention is to pro 5 with respect to the brake drum in which said
vide the supporting‘ means of an anchor block
shoes operate. One of‘ these expedients has been
for a self-centering brake in the form of a spring
to‘ shift the heel end of. the shoe with respect to
in order to produce the necessary resiliency
the anchor pin, one form of which construction
therein‘ to generate the desired friction between
is disclosed in Reissue Patent No. 22,515. In
the brake shoe and anchor block, thereby elimi 10 brakes of the self-centering type it ‘is desirable to
mating the need of an additional spring for the
produce sufficient- .friction between the sliding
purpose.
surfaces of the centering device to hold the shoe
Another object of the invention is to produce
in ‘centered position when the‘brake is'released.
a resilient linkage mechanism connecting‘ the
The instant invention is an improved means for
anchor pin and the cooperating ends of the brake
doing this over the disclosure set forth in the
shoe in which the resilient elements are incorpo
identi?ed patent.
‘
rated into the linkage per se.
‘
The aboveobiects are achieved in the structure
A further object of the invention is to provide ‘ shown in the accompanying drawing in which
a spring linkage connecting the anchor, pin and
l is a conventional backing plate provided with
the shoe whereby the anchor block and the co 20 an‘ anchor pin 2. Fitted over the anchor pin 2
operating shoe end are maintained in constant
is an anchor block 3 disposed within a U-shaped
frictional engagement.
v
block supporting element 4 secured to shoe 5 by
A still further objectrof the invention is to
means of a pin 6 which extends through the web
provide in a brake assembly, a spring type con
of shoe 5 and through the legs of the U-shaped
nection between the anchor pin and the shoe to
element 4. The pin 6 is?xed in the Web of shoe
maintain the anchor block associated with the
-5 and‘ is enlarged as at T'- in order to be ?rmly
pin in frictional engagement with the cooperat_
‘ held therein; The aperture in each of the ‘leg
ing end of the shoe in order that when the shoe'
elements 8 and 9‘is‘ preferably 'in the form of
moves relatively to the anchor block, the spring
elements will maintain the adjustment by ?rm
frictional engagement of the parts.
Other and further objects 'of the invention, will
occur to those skilled in the arts to which this
slots l6 andv II to" allow ready assembly of the
U-shaped element 4 thereon and relative move
ment of shoe 5 and element 4.
l
‘
V
t
. The anchorblock 3 ?tted over anchor pin 2
hasa curved surface 12 cooperating with a cor
application pertains as the description proceeds,
which, taken in connection with the accompany
ing drawing sets forth a preferred embodiment
of the invention and selected modi?cations
thereof but such disclosures are-not to be con
respondingly curved surface‘ l3 formed on the
web porti'on‘of shoe 5.‘ The radius of rotation
is about the center of‘ pin 6 such that the two
surfaces may move relatively of each other about
strued as a limitation of the invention which is
just itself with respect to the axis of rotation of
limited only by the appended claims, and any 40
a common center- to thereby cause shoe 5 to ad
brake drum 25.
‘
'
>
-
and all modi?cations, alterations and variations
If, at the initial installation of the brake or
of structure coming within the spirit and scope
at any time during the operation of the brake
thereof are deemed to ‘be included‘ herein.
by cylinder 15, the outer surface radius of the
In the drawing:
brake lining does not concentrically engage the‘
Figure» 1 shows an elevational view of the pre 45 inner corresponding engagement surface of the
ferred embodiment of the invention;
'
brake drum, .a slippage will occur between shoe
Figure 2 shows a general perspective view of
5 and’ anchor block 3 which will allow the shoe
the linkage;
v
to correctly center itself within the drum. The
Figure 3 is a sectional view-taken along the line
slippage of surface l2 onsurface-w about 6 as
3-3 of Figure 1;
5.0 a center will cause the shoesjto center themselves
Figure 4 shows a modi?ed construction of the
and thereby; again uniformly distribute the brake
anchor block mounting;
‘pressure over the engagement surface of drum 25.
Figure 5 is a sectional view- taken along the
Spring l6 retracts shoe 5 from drum 25 following
line 5-5 of Figure 4; and
‘
each operation. .
e
Figure 6 shows a plan View of another modi?ed 65 > - The. leg elements 8 and 9- are bowed, as shown
2,398,717
2
in Figures 1, 2 and 3, or are formed in any similar
manner to provide elasticity or stretchability, and .
may be heat treated if necessary to increase the
allowable stressability of the material used. These
legs are then stretched in assembly, due to proper
dimensioning of parts, a su?icient amount to
cause them to act as tension springs between pin
6 and back surface of block 3. The spring action
thus acquired tends to pull shoe 5 and. block 3
together and causes surfaces l2 and I3 to bear
heavily against’ each other. The leg elements 8
and 9 are indented as at IT and I8 to grip the
web portion of shoe 5 and keep the same centered
with respect to the anchor- block 3.. A retaining
element I9 is provided to keep the anchor block’
and U-shaped element 4 ?xed to the anchor pin 2.
A modi?cation of the above is shown in Figures
4 and 5 in which the same anchor pin 2, backing '
said means, said anchor block having a curved
surface complemental to the end of said shoe, the
legs of said U-shaped member being resilient in
order to cause said curved surfaces on said anchor
' block and shoe to be drawn into engagement with
each other, the legs on said U-shaped member
being indented in order to center the shoe with
respect to said anchor block; means to rotate said
shoe about said'pivot; and said shoe when pivot
ing about said means centering said shoe with
respect to the brake drum engaged thereby.
2. In a brake, a backing plate; an anchor pin
secured'thereto; a U-shaped member; an anchor
block received in said U-shaped member, said
U-shaped member and anchor block having aper
tures therein to receive said pin; means in said
shoe to pivot said shoe with respect to said U
shaped member, said U-shaped member having
indentations therein to center said shoe with re
The pin 6 is the same as in the 20 spect to said anchor block, said shoe having its
plate I, brake drum 25 and shoe 5 construction
is employed.
previously described construction. In this modi
?eation the U-shaped element 20, while being of
different shape as previously set forth, has legs
end formed‘on a. radius about said means, said
anchor block having a surface formed thereon
complemental to the end of the shoe; and said
U-shaped member having its legs resiliently
2| and 22 which are associated with the anchor
pin and shoe 5 in the same manner as also previ 25 formed in order to cause said complemental sur
i aces to ?rmly frictionally engage each other,'said
ously discussed. In this modi?cation the leg ele
shoe pivoting about said means in order to ‘center
ments, instead of being bowed as more, particu
saidshoe with respect to said backing plate.
larly shown in Figure 3, are crimped asat 23 and
3. In a brake, a backing plate; an anchor pin
24, which erimpings are treated in the same man- ,
ner as parts 8 and 9 in order to impart spring 30 ?xed in said plate; a brake shoe; means to pivot
said shoe about said pin; means to enable said
qualities thereto. The same indentations l1 and
shoe to pivot about said pin which includes an
I8 are formed in leg elements 2| and 22 for the
anchor block; a U-shaped member receiving said
same purpose asset forth above. The operation
of the disclosure in Figures 4 and 5 is identical 7 > ‘anchor block and arranged on said pivot pin; a
second pivot pin secured in said shoe receiving
to that set forth above.
.
V
The operation of each of the devices depends
upon the relative movement that takes place be
tween anchor block 3 and the cooperating end
of shoe 5 to cause relative motion between the two
the free ends of said U-shaped member;
means in said U-shaped member centering
shoe with respectto said anchor block, said
having its end curved on the radius about
said
said
shoe
said
either end of the shoe engages the drum prior to
the other end. The rotation about pin 6 takes
face complemental to said curved surface on said
shoe; and said U-shaped member having its legs
formed into a resilient bow to cause said comple
mental surfaces to frictionally engage each other
whenever wear occurs on the brake lining M or 40 second pivot, said anchor block having a sur
place in‘ both directions of movement, that is,
toward and away from the brake drum in order
that the spacing between the shoe and the brake 45 but permit movement of said anchor block rela
tive to said shoe about said second pivot as an
drum will be uniform to cause uniform pressure
axis to center said shoe with respect to said back
and wear on the friction lining.
ing plate.
The anchor block holder is assembled on shoe
4. In a brake, a backing plate; a brake drum
5 by ?rst slipping the ends of pin 6 through slots
I0 and II and then forcing'the block 3 over the 50 rotatable with respect thereto; a brake shoe piv
otally mounted on said backing plate; means to
end of shoe‘ 5, thereby, bringing surfaces l2 and
pivot said shoe about said pin; means to connect
I3 into engagement and stretching parts 8, 9, 23,
said shoe to said pin which includes an anchor
and 24 to frictionally engage surfaces l2 and I3.
Figure 6 shows another modi?cation in which 55 block and a U-shaped member to receive said
anchor block receivable on said pin; means to
shoe 5' has a pin 6 ?xed in the web of the shoe.
pivot said shoe with respect to said anchor block,
‘A U-shaped element 26 is provided having anchor
said shoe having a curved surface thereon drawn
block 3 and curved shoe end 28 received therein,
about said means,‘ said anchor block having a
all ?tting over'anchor pin 2 as set forth above.
The leg elements 21 and 29 of part 26 are slotted 60 curved’ surface complemental to said ?rst men~
tioned curved surface, said U—shaped member
in the same manner as set forth above to ?t over
having its legs bowed constituting same as
pin 6. >The spring element is formed in back 33
springs to urge said curved‘surfaces into fric
of part 26‘by bowing same as shown and provid
tional engagement; and said shoe when pivot
ing it with an indentation at 3| to keep block 3
ing about said means centering said shoe with
and part 26 together in a locked condition.
65 respect to said drum.
Having fully described my invention, that which
5. In a brake, a backing plate; a drum rotat
I claim as novel and desire to protect by Letters
able with respect “thereto; an anchor pin se
Patent of the United States is:
cured to said backing plate; a brake shoe;
‘ 1. In a brake, a backing plate; a, brake shoe;
a pivot pin ?xed to said backing plate; an anchor 70 means connecting said shoe and ‘said pin to pivot
said shoe with respect to said pin which includes
block on said pivot pin; a U-shaped member re
an anchor block; a U-shaped member receiving
ceiving said anchorblock ?tted over said anchor
said anchor block and ?tted over'said pin; means
pin; means in said shoe adapted to receive the
free ends of said U-shaped element, saidshoe
toesecure said U-shaped' member to said shoe,
having a curved end with a radius drawn about 75 said shoe having its one‘end curved in a radius
3
2,398,717
surface; means to pivot said shoe about said pin;
the legs of said U-shaped member being made
second pivot pin secured in said shoe receiving
the free ends of said U-shaped member; said
means in said U-shaped member centering said
shoe with respect to said anchor block, said shoe
into a spring in order to urge said surfaces into
frictional engagement; and said surfaces mov
ing relatively to each other about said means as
having its end curved on the radius about said
second pivot, said anchor block having a surface
complemental to said curved surface on said shoe;
an axis in order to center said shoe with respect
to said drum.
thereof deformed and made resilient to cause
about said means, said anchor block having a
surface complemental to said ?rst mentioned
and said U-shaped member having a portion
6. In a brake, a backing plate; a brake drum; 10 said complemental surfaces to frictionally engage
each other but permit movement of said anchor
block relative to said shoe about said second pivot
brake shoe pivoted about said anchor pin; means
as an axis to center said shoe with respect to said
to pivot said shoe about said anchor pin; means
backing plate.
to connect said anchor pin in said shoe which
10. In a brake, a backing plate; a brake drum
includes an anchor block; a, U-shaped member, 15
rotatable with respect thereto; a brake shoe piv
said anchor block received in said U-shaped
otally mounted on said backing plate; means to
member and having apertures therein receiv
pivot said shoe about said pin; means to connect
able over said anchor pin: and pivot means in
said shoe to said pin which includes an anchor
said shoe to receive the legs of said U-shaped
member and said legs of said U-shaped member 20 block and a U-shaped member to receive said an
chor block receivable on said pin; means to pivot
being deformed and made into a spring in order
to urge said shoe into engagement with said
said shoe with respect to said anchor block, said '
shoe having a curved surface thereon drawn about
anchor block, said anchor block and said shoe
having complemental curved surfaces drawn
said means, said anchor block having a curved
about said last mentioned means as a center, said 25 surface complemental to said ?rst mentioned
shoe pivoting about said means when being cen
curved surface, said U-shaped member having
tered with respect to said brake drum by caus
a portion of its structure deformed and made into
ing said complemental surfaces to slide one with
a spring to urge said curved surfaces into fric
‘ an anchor pin ?xed in said backing plate; a
respect to the other, said spring elements main
taining the adjusted position of said complemen
tional engagement; and said shoe when pivoting ,
30 about said means centering said shoe with respect
tal surfaces whenever said shoe pivots with re
spect to said anchor block.
7. In a brake, a backing plate; an anchor pin ‘
secured thereto; a U-shaped member; an anchor
to said drum.
11. In a brake, a backing plate; a drum rotat
able with respect thereto; an anchor pin secured
to said backing plate; a brake shoe; means con
block received in said U-shaped member, said 35 necting said shoe and said pin to pivot said shoe
U-shaped member and anchor block having
with respect to said pin which includes an anchor
apertures therein to receive said pin; means in
block; a U-shaped member receiving said anchor
said shoe to pivot said shoe with respect to said
block and ?tted over said pin; means to secure
U-shaped member, said shoe having its end
said U-shaped member to said shoe, said shoe
formed on a radius about said means, said 40 having one end curved in a radius about said
anchor block having a surface formed thereon
means, said anchor block having a surface com
complemental to the end of the shoe; and said
U-shaped member having its legs deformed to
plemental to said ?rst mentioned surface; means
to pivot said shoe about said pin; a portion of
said U-shaped member being deformed and made
make them resilient in order to cause said com
plemental surfaces to ?rmly frictionally engage
each other, said shoe pivoting about said means
in order to center said shoe with respect to said
backing plate.
'
8. In a brake, a backing plate; an anchor pin
secured thereto; a U-shaped member; an anchor
block received in said U-shaped member, said
U-shaped member and anchor block having
apertures therein to receive said pin; means in
said shoe to pivot said shoe with respect to said
U-shaped member, said U-shaped member hav- 1
ing indentations therein to center said shoe with
respect to said anchor block, said shoe having its
end formed on a radius about said means, said
anchor block having a surface formed thereon
complemental to the end of the shoe; and said
U-shaped member having a portion thereof de~
formed and made resilient in order to cause said
complemental surfaces to ?rmly frictionally en
gage each other, said shoe pivoting about said
means in order to center said shoe with respect to
said backing plate.
9. In a brake, a backing plate; an anchor pin
fixed in said plate; a brake shoe; means to pivot
said shoe about said pin; means to enable said
shoe to pivot about said pin which includes an
anchor block; a U-shaped member receiving said
anchor block and arranged on said pivot pin; a
into a spring in order to urge said surfaces into
frictional engagement; and said surfaces moving
relatively to each other about said means as an
axis in order to center said shoe with respect to
said drum.
,
12. In a brake, a backing plate; a brake drum;
an anchor pin ?xed in said backing plate; a brake
shoe pivoted about said anchorpin; means to
pivot said shoe about said anchor pin; means-to
connect said anchor pin in said shoe which in
cludes an anchor block; a U-shaped member, said
anchor block received in said U-shaped member
and having apertures therein receivable over said
anchor pin; and pivot means in said shoe to re
ceive the legs of said U-shaped member and a
portion of said U-shaped member being deformed
and made into a spring in order to urge said shoe
into engagement with said anchor block, said
anchor block and said shoe having complemental
curved surfaces drawn about said last mentioned
means as a center, said shoe pivoting about
means when being centered with respect to
brake drum by causing said complemental
faces to slide one with respectto the other,
said
said
sur
said
spring elements maintaining the adjusted posi
tion of said complemental surfaces whenever said
shoe pivots with respect to said anchor block.
‘
RUSSELL S. OWENS.
Документ
Категория
Без категории
Просмотров
0
Размер файла
662 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа