US2745516A - Floating shoe brake - Google Patents

Description

3 Sheets$heet 1 Filed Feb. 28, 1952 irrazlvzv s,

May 15, 1956 R. F. SMITH FLOATING SHOE BRAKE 3 Sheets-Sheet 2 Filed Feb. 28, 1952 INVENTOR.

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,yrroiv/r/s May 15, 1956 Filed Feb. 28, 1952 R. F. SMlTH FLOATING SHOE BRAKE] 3 Sheets-Sheet 3 INVENTOR. /%Zer2 f 5,7722% United States Patent FLOATIN G SHOE BRAKE Robert F. Smith, Detroit, 'Mich., assignor to Chrysler Corporation, Highland 'Park, Mich.,-.a corporation of Deiaware Application February 28, 1952, Serial No. 273,957

13 Claims. (Cl. 18878) 'This invention relates to internally expanding floating shoe brakes of the non-servo type, and particularly to the means for anchoring and centering the floating shoes of such a brake assembly.

It is a primary object of this invention to provide a floating shoe construction that permits a conventional brake assembly with fixed pivot brake shoes to be readily converted into a floating shoe brake assembly.

.It is another object of this invention to provide a novel form of anchor means for floating brake shoes that also assist in maintaining the shoes centered with respect .to the drum, and further provides an anchor member for .the resilient shoe-positioning means associated with the heel ends of the brake shoe.

.Itis still another object of this invention to arrange the resilient :brake .shoe positioning means at the heel .ends

of the shoes such that they will not alter or otherwise adversely eifect the automatic shoe centering action of the floating shoe in brake assemblies of the type herein disclosed. 7

It is still .a further object of this invention to arrange the resilient shoe-positioningmeans that extends between the heel end of a floating brake shoe and the anchor ramp associated therewith such that the line of action .of the resilient positioning means is substantially normal to the anchor ramp surface along which the shoe heel'is adapted to move.

his another object of this invention to providea floating shoe brake assembly having novel shoe'anchor means .that permit the use of improved types of shoe return springs.

It is still another object of this invention to provide a floating shoe brake assembly having the maximum free space within .the drum-enclosedarea.

Other objects and advantages of this invention will become readily apparent from a reading of the following description and a consideration of the accompanying drawings wherein:

Figure l is a side elevational viewpartly-in section, :of a two leading shoe brake assembly embodying .this invention;

Figure 2 is a fragmentary sectional elevational view of portions of the brake assembly shown in Figure 1, this view being taken along the line 2-2 of Figure l;

Figure 3 is another fragmentary sectional elevational view of portions of the brake assembly shown in Figure 1, this view being taken along the line 3-3 of Figure 1;

Figure 4 is a perspective view of one of the shoe .anchor plates utilized in the embodiment of this invention shown in Figure 1;

.Figure 5 is a side elevational view, partly in section, of a brake assembly including certain features of this invention, which assembly provides a single leading shoe in either-direction of wheel rotation;

Figure 6 is a fragmentary sectional elevational view of portions of the brake assembly shown in Figure 5, this view being taken along the line 66 of Figure 5;

Figure 7 is a fragmentary sectional elevational view of portions of the brake assembly shown in Figure 5, this view being taken along the line 77 of Figure 5;

Figure 8 is .a fragmentary sectional elevational view of portions of the brake assembly shown in Figure .5, this view being taken along the line 88 of Figure 5;

Figure 9 is a front face elevational view of the backing plate utilized in the brake assembly shown in'Figure 1;

Figure 10 is a front face elevational view of the backing plate utilized in the .brake assembly shown in Figure 5; and

Figure 11 is a sectional elevational view of the backing plate shown in Figure 9, this view being taken along the line 11-11 of Figure 10. I

Considering Figure'l, the brake assembly shown is composed of apair of floating, non-servo,,leading shoes 21 and 22 respectively. Shoes 21 and 22 are movably mounted on a backing .or support plate 24 and are adapted to he moved into and out of engagement with the axially extending, surrounding flange .26 of the rotatable brake drum 25. ,Fixedly mounted on the backing plate 24, in diametrically opposed positions, are a pair of :hydraulically operated brake shoe actuating wheel .cylinders 28 and 29 respectively. Each wheel cylinder is identical to the other, so a description of one is thought to be sufiicient.

From Figures 1 and 2 it will be noted that the wheel cylinder 28 comprises a cylindrical, cup-shaped, body portion 31) having a flattened mounting flange 31 extend ing from the outer side of the closed bottom .end .of the cylinder cup 30. The mounting flange 31 extends substantially axially with respect to the cylinder bore of wheel cylinder 28 andthis mounting flange 31 is connected to the inner or front face of the backing. plate 24 by the anchor bolt 33 and its associated nut '34.

- Within the bore in the body portion 30 of the cylinder 28 is an axially reciprocable piston v35. Piston 35 is connected by a plunger rod 36 to the web portion 42 at the toe end of brake shoe 22. Wheel cylinder body portion 30 has -a first bored boss 37 that is adapted to :be connected to a pressure fluid supply line (not shown) to provide for introduction of pressurized fluid to the cylinder bore in the wheel cylinder 28. The backing plate 24 is pierced by an opening 38 to permit connection of the aforementioned pressurefluid supply line (not shown) to the cylinder boss 37. Wheel cylinder body portion 30 has another bored and threaded boss 39 projecting from its front side, which boss is adapted to be connected by a conduit line (not shown) to a similar boss 39 on the front side of the wheel cylinder 29.

Each of the brake shoes 21 and .22 is identical in con- .struction so a description of the shoe '22 is thought to sufiice. Shoe .22 is of T-shaped cross sectional configuration (see Figure 2) and .is :composed of an :arcuate table or rim portion 41 and a connected web portion 42 that extends perpendicularly to the inner side of the rim portion 41 along the longitudinal centerline thereof. The outerside of shoe rim portion '41 is covered with a layer of brake lining 43 of conventional construction. The toe endof the web 42 is connected .to the associated wheel cylinder 28 through the plunger rod 36 as previously-described. The heel end of the shoe web 42 has the end edge44 thereof shaped to :provide a convexly curved portion that is adapted to both roll .and/ or slide along a sub- .stantially radiallyextending ramp surface 52 of the associated anchor plate 50.

Anchor plate 50 (see Figure 4) has a flat body-portion 51 with one side edge formed to provide :the flat, .angled, substantially radially extending ramp surface 52. .One end 53 of the plate body portion .51 is bent normal to itself to provide a tab adapted to be mounted in :.a.,mating slot 54 formed in the associated backing plate 24. The

body portion 51 of the anchor plate 50 is pierced with a pair of openings 55 and 56. Opening 55 is adapted to receive the anchor bolt 33 so as to connect the anchor plate 50 to the backing plate 24 and provide the means for transferring the brake reaction of shoe 22 to the backing plate 24.. The opening 56 in the anchor plate body portion 51 is adapted to receive the hook-like end 61' of the shoe return spring 60' that is connected to the toe end of brake shoe 21. Projecting from and offset from the body portion 51 so as to extendsubstantially parallel to the body portion 51 of the anchor plate 50 is a finger portion 57. Finger portion 57 serves a dual function in that first it extends along the outer side of the shoe web portion 42 at the heel end thereof and retains the web portion 42 of shoe 22 between the finger 57' and the v 1 portion 31'a of the wheel cylinder 29; By sandwiching the-shoe web 42 between the anchor plate finger 57 and ,the wheel cylinder mounting flange 31'a on the shoe web is held was to prevent shoe cocking. anchor plate 50 serves a second function, namely, that The finger 57 on of providing means to which the hooked end 64 of shoe positioning'spring'63 'may be anchored. Finger 57 is pierced by an opening 58 through which the spring end 64 is passed. Brake shoe web portion 42 is also pierced by an enlarged opening 42a that receives the spring end 64 yet permits movement of the shoe relative to the anchored spring end 64. The opposite-end 65 of the shoepositioning-spring 63 is anchoredin' an opening 66 in the web 42 of brake shoe 22 adjacent the heel end thereof.

' tomatic self-centering of the shoes.

The principles of floating shoe control, disclosed in the copending application of A. R. Trahern, Serial No. 256,706, filed November 16, 1951, may be applied to a brake assembly embodying this invention, for it will be noted that the lines of action 71, 72, 73 of the several forces acting on the shoe 22, all converge towards the common center 74. Accordingly, there are no moments tending to shift the heel end 44 of the shoe 22 along the ramp 52 so as to alter the self-centering action of the shoes of this brake assembly. Line of action 71' is the line along which the shoe positioning spring 63 acts and also the force line of the anchor plate reaction. Line of action 72 is the line of action of the brake shoe return spring 60 that is connected between a hook projection'76 on the shoe web 42 and the anchor plate 50' associated with the wheel cylinder 28. Line of action 73 is the line of action of the wheel cylinder piston 35 that actuates the brake shoe 22.

Rotatably mounted on the backing plate 24 are cam elements 77. and 77'. Each of these elements is adapted to provide a means for setting the normal clearance between the inner side of the brake drum flange 26 and one of the lined rim faces of the pair of brake shoes 21, 22. Adjusting cams of this sort are old in the art and no clairn is made for this specific type of adjusting means.

Also mounted on the backing plate are a pair of J-shaped shoe hold down springs 78, 78' that have the 'leg portions 784: and 78a respectively, pressed against the web portions 42 and 42' of the associated brake shoes 21, 22. Springs 78, 78' urge the shoes 21, 22 against raised bosses 79 thatprojectfrorn the inneror front face of the backing plate 24. Springs 78, 78' and bosses 79 are each well known means of positioning brake shoes within a brake drum and no claim is made herein regarding the novelty of these elements.

. As thebrake shoes 21 and 22 are identical and as there are two sets of identical shoe-operating elements associated with these two shoes 21, 22, there has been a complete description of the elements associated with only the shoe 22. The similar elements associated with shoe 2'1 carry primed reference numerals corresponding to the identical elements described with regard to brake shoe 22.

Figures 5-8 show a floating shoe brake assembly that contains two floating, non-servo shoes 121 and 122 arranged such that only one shoe is self-energizing in each direction of rotation of the brake drum 125. Shoes 121 and 122 are shiftably mounted on the backing .or support plate 124 so that they may be expanded radially to engage the inner side of the brake drum flange 126. The toe ends of the two shoes 121 and 122 are each connected through plunger rods 127 and 128 respectively, toone of the pair of reciprocable piston elements 129 carried within the double piston, shoe actuating wheel cylinder 130. Wheel cylinder 130 is fixedly mounted on the backing plate 124 by the bolt connectors 131. Wheel cylinder 130 has cylindrical portions 130a projecting from the rear side thereof that are adapted to seat in a mating opening I 132 that pierces the backing plate 124. Cylinder portions 130a include port connections (not shown) to provide for the introduction of pressure fluid to the interior of the bore of wheel cylinder 139. The cylinder mounting bolts 131 also support a bracket 133 having a stud 134 thereon that provides an anchor post for the inner hooked ends 135 and 136 of the brake shoe return springs 138 and 139 respectively. The outer ends 141 and 142 of the springs 138 and 139, respectively, are fastened to hooklike projections 144 and 145 on the webs 153 and 154 of the brake shoes 121 and 122 respectively.

Brake shoes 121 and 122 are of T-shaped cross sectional configuration and are substantially identical to the shoes 21 and 22 already described relative to Figures 1-4. The heel and edges 151 and 152 of the webs 153 and 154 of brake shoes 121 and 122 respectively, are convexly curved so that they may roll and/or slide along their respective ramp-like anchor surfaces 163 and 164 of the anchor block 160.

The anchor block 16%, that provides the substantially radially extending shoe ramp surfaces 163 and 164, is in reality a laminated construction composed of portions of the backing plate 124, portions of the backing plate reinforcement plate 165 that is welded to the backing plate 124, as indicated at 166, a plate member 167 having converging end edges that actually provide the ramp surfaces 163 and 164, and a cover plate 168. The several elements 124, 165, 167, and 168 are held together in assembled relation by the rivet connectors 169. It will be noted that the ends of plate 167 that provide the shoe ramps 163 and 164 are set in from the ends of the plates 165 and 168 so that plates 165 and 168 form guide wings for the shoe web portions 151 and 152 that are engaged with the anchor block ramp surfaces 163 and 164. The wing-like projections provided by the plates 165 and 168 serve as guides for the brake shoe webs 153 and 154 so that the brake shoes will be restrained from cocking relative to the brake drum flange 126.

In addition to the shoe web guides provided by the spaced plates 165 and 168, shoe centering springs 171 and 172 may be provided. These J-shaped spring elements 171 and 172 urge the shoes 121 and 122 toward the backing plate 124. Backing plate 124 is providedwith cir cumferentially spaced, raised bosses 173 that are engageable with the inner edges of the shoe rims 155 and 156 respectively, to assist in correctly positioning the brake shoes within the brake drum 125. Rotatable, cam type, shoe clearance earns 175 and 176 are also carried by the backing plate 124 to provide for adjustment of the normal clearance between the brake shoe linings 177 and 178 and the encircling drum flange 126.

It will be noted from Figure 5 that the heel ends 151 and 152 of the brake shoes 121 and 122 are urged against the ramp surfaces 163 and 164' by shoe-positioning spring elements 181 and 182 respectively. Also it will be noted that these shoe-positioning springs 181 and 182 act along lines that are substantiallynormal to the ramp surfaces 163 and 164 associated with the respective shoes. Such i 54, 54' are readily visible.

a spring arrangement at the heel end of the brakeshoesinsures that the positioning springs 181 and 182 will not develop forces that would terd to interfere with the selfcentering action of the floating brake shoes.

As was the case with the form of the invention shown in Figures 1-4, the Figure 58 form of the invention has the several lines of action of the forces acting on the brake shoes all passing through a common center point or center area at least. The line of action 186 for the positioning spring 182 and the anchor reaction force passes through the common center 1%. The line of action 187 of the brake shoe return spring 139 passes through the common center 199. The line of action '188 of the shoe actuating piston 129 also passes through the common center 190. The arrangement of the several brake elements to insure that the lines of action for all forces applied to the shoes pass through a common center point tends to prevent interference with the inherent self centering of the brake shoes 121, 122 relative to the brake drum flange 126. The advantages of such an arrangement are clearly pointed out in the aforementioned copending application of A. R. Trahern.

Figure 9 is an elevational view looking towards the front face of the backing plate 24 that is utilized in the brake assembly shown in Figures -l-4. In addition to the openings 191, 191' that receive the piston anchor bolts 33, 33 respectively, the anchor plate mounting slots Also the journals 193, 193' for the adjusting earns 77, 77 are also plainly disclosed. Openings 1%, 194 may be provided in the backing plate 24 to receive stud-like formations (not shown) on the wheel cylinders 23 and 29. Anchoring of studs of the wheel cylinders in the backing plate openings 194, 194 prevents rotation of the wheel cylinders 28, 29 about the anchor bolts 33, 33 respectively.

Figure 10 is an elevational view of the front face of the backing plate 124 that is utilized with the form of the invention shown in Figure 5. The opening 132 in plate 12 is adapted to receive the rearwardly extending portions 130a of the wheel cylinder 130. The journals 198 .and 199 for the shoe clearance adjusting cams 1'75 and 176 respectively, are clearly shown in this view. Openings 290 receive the rivets 169 that fasten theshoe anchor block unit 169 to the backing plate 124. Openings 201 are adapted to receive the bolt connectors 131 that fasten the wheel cylinder 13% to the backing plate 124.

With the particular brake assembly disclosed, selfcentering action of the floating shoes is assured at all times. The resilient shoe positioning and shoe retracting elements are particularly arranged to assist in maintaining correctly centered shoes and those elements cannot provide forces that would interfere with the shoe-centering action. In addition, due to the manner of mounting the resilient shoe-positioning and shoe-retracting elements, the maximum free space is available within the brake drum and furthermore, relatively small, simple, cheap, resilient spring elements may be utilized. As a result maximum in performance may be achieved with a minimum cost.

I claim:

1. In a floating shoe brake assembly, an annular, relatively fixed, backing plate, a pair of hydraulically operated brake shoe actuators mounted on said backing plate at diametrically opposed positions, a bolt-like connector fastening each of said actuators to said backing plate, an anchor plate carried by each of said bolt-like connectors that is independent of the actuator mounted on the same connector, each anchor plate having portions thereof formed to provide a substantially radially extending-ramp surface, a brake shoe extending between each actuator and the ramp surface on the anchor plate associated with the other actuator fastener bolt, said shoes each having the toeend thereof connected to an actuator and the heel end thereof engaged with an anchor plate ramp surface for movement therealong, and resilient means continuously urging said shoes into retracted positions against theirassociated actuator and anchor plate ramp surface.

2. In a floating shoe brake assembly, an annular, :relatively fixed, backing plate, a pair of hydraulically operated brake shoe actuators mounted on said backing plate at diametrically opposed positions, a bolt-like connector fastening each of said actuators to said backing plate, an anchor plate carried by each of said bolt-like connectors that is independent of the actuator mounted on the .same connector, each anchor plate having portions thereof formed to provide a substantially radially extending ramp surface, a brake shoe extending between each actuator and the ramp surface on the anchor plate associated with the other actuator fastener bolt, said shoes each having the toe end thereof connected to .an actuator and the heel end thereof engaged with an anchor plate ramp surface for movement therealong, and resilient means continuously urging said shoes into retracted positions against their associated actuator and anchor plate ramp surface, said anchor plates each having guide portions engageable with the associated shoe to resist cocking of the associated shoe Within the brake assembly.

3. In a floating shoe brake assembly, an annular, relatively fixed, backing plate, a pair of hydraulically operated brake shoe actuators mounted on said backing plate at diametrically opposed positions, a bolt-like connector fastening each of said actuators to said backing plate, an anchor plate carried by each of said bolt-like connectors, each anchor plate having portions thereof formed to provide a substantially radially extending ramp surface, a brake shoe extending between each actuator and the ramp surface on the anchor plate associated with the other actuator fastener bolt, said shoes each having the toe end thereof connected to an actuator and the heel end thereof engaged with an anchor plate ramp surface for movement therealong, and resilient means continuously urging said shoes into retracted positions against their associated actuator and anchor plate ramp surface, said anchor plate each having guide portions engageable with the associated shoe to resist cocking of the associated shoe within the brake assembly, said last mentioned guide portions of said anchor plates further providing anchor means for certain of the resilient means urging the respective brake shoes against the anchor plate ramp surfaces.

4. In a floating shoe brake assembly, an annular, relatively fied, backing plate, a pair of hydraulically operated brake shoe actuators mounted on said backing plate at diametrically opposed positions, a bolt-like connector fastening each of said actuators to said backing plate, an anchor plate separable from and independent of each actuator but carried by each of said bolt-like connectors, each anchor plate having portions thereof formed to provide a substantially radially extending ramp surface, a brake shoe extending between each actuator and the ramp surface on the anchor plate associated with the other actuator fastener bolt, said shoes each having the toe end thereof connected to an actuator and the heel end thereof engaged with an anchor plate ramp surface for movement therealong, and resilient means continuously urging said shoes into retracted positions against their associated actuator and anchor plate ramp surface, the lines of action of the forces applied to each shoe by the associated actuator and resilient means as well as the normal to the ramp surface at the point of engagement of the shoe therewith each passing through a common center.

5. In a floating shoe brake assembly, a support plate, a pair of brake shoe actuators mounted on said support plate at diametrically opposed positions, fastener means fixedly connecting'the actuators to the support plate-s, 'a substantially fiat anchor plate mounted on each of said actuator fasteners and separate from the actuator mounted on the same fastener means, each anchor plate having an edge portion arranged to provide a substantially radially extending shoeramp surface, a brake'shoe extending .between each actuator and the anchor plate mounted on the fastener associated with the other actuator, said shoes eachcomprising a rim portion and a connected web portion, the shoe web portions'of each shoe having the toe end thereof connected to an actuator and the heel end thereof convexly curved to provide portions to'roll and slide along the ramp surface of the anchor plate supported by the fastener means for the other actuator, and resilient means continuously urging each of said brake shoes into engagement with the associated actuator and shoe supporting anchor plate ramp surface.

6. In a floating shoe brake assembly, a support plate, a pair of brake shoe actuators mounted on said support plate at diametrically opposed positions, fastener means fixedly connecting the actuators to the support plates, a substantially flat anchor plate mounted on each of said actuator fasteners, each anchor plate having an edge portion arranged to provide a substantially radially extending shoe ramp surface, a brake shoe extending between each actuator and the anchor plate mounted on the fastener associated with the other actuator, said shoes each comprising a rim portion and a connected web portion, the shoe web portions of each shoe having the toe end thereof connected to an actuator and the heel end thereof convexly curved to provide portions to roll and slide along the anchor plate ramp surface supporting the particular shoe, and resilient means continuously urging each of said brake shoes into engagement with the associated actuator and shoe supporting anchor plate ramp surface, said resilient means including a first resilient element connected between the heel end of the web of each shoe and the anchor plate supporting the associated shoe heel and arranged such that the line of action of each of the said first resilient elements is substantially normal to the ramp surface on which the particular shoe heel rests.

7. In a floating shoe brake assembly, a support plate, a pair of brake shoe actuators mounted on said support plate at diametrically opposed positions, fastener means fixedly connecting the actuators to the support plates, a substantially flat anchor plate mounted on each of said actuator fasteners, each anchor plate having an edge portion arranged to provide a substantially radially extending shoe ramp surface, a brake shoe extending between each actuator and the anchor plate mounted on the fastener associated with the other actuator, said shoes each comprising a rim portion and a connected web portion, the shoe web portions of each shoe having the toe end thereof connected to an actuator and the heel end thereof convexly curved to provide portions to roll and slide along the anchor plate ramp surface supporting the particular shoe, and resilient means continuously urging each of said brake shoes into engagement with the associated actuator and shoe supporting anchor plate ramp surface, said resilient means including a first resilient element connected between the heel end of the web of each shoe and the anchor plate supporting the associated shoe heel and arranged such that the line of action of each of the said first resilient elements is substantially normal to the ramp surface on which the particular shoe heel rests, said resilient means further including a second resilient element connected between the toe end of the web of each shoe and the anchor plate located adjacent the actuator for the shoe.

8. In a floating shoe brake assembly, a support plate, a pair of brake shoe actuators mounted on said support plate at diametrically opposed positions, fastener means fixedly connecting the actuators to the support plates, a substantially fiat anchor plate mounted on each of said actuator fasteners, each anchor plate having an edge portion-arranged to provide a substantially radially extending shoe ramp surface, a brake shoe extending between each actuator and the anchor plate mounted on the fastener associated with the other actuator, said shoes each comprising a rim portion and a connected web portion, the shoe web portions of each shoe having the toe end thereof connected to an actuator and the heel end thereof convefly curved to provide portions to roll and slide along the anchor plate ramp surface supporting the particular shoe, and resilient means continuously urging each of said brake shoes into engagement with the associated actuator and shoe supporting anchor plate ramp surface, said resilient means including a first resilient element connected between the heel end of the web of each shoe and the anchor plate supporting the associated shoe heel and arranged such that the line of action of each of the said first resilient elements is substantially normal to the ramp surface on which the particular shoe heel rests, said resilient means further including a second resilient element connected between the toe end of the web of each shoe and the anchor plate located adjacent the actuator for the shoe, the line of action of the second resilient element associated with each shoe passing through the intersection of the line of action of the first resilient element and the line of action of the actuator for the corresponding shoe.

9. In a floating shoe brake assembly, a support plate, a pair of brake shoe actuators mounted on said support plate at diametrically opposed positions, fastener means fixedly connecting the actuators to the support plates, a substantially fiat anchor plate mounted on each of said actuator fasteners and independent of the actuator mounted on the same fastener, each anchor plate having an end portion extending outwardly and connected to said support plate and an edge portion arranged to provide a substantially radially extending shoe ramp surface, a brake shoe extending between each actuator and the anchor plate mounted on the fastener associated with the other actuator, said shoes each comprising a rim portion and a connected web portion, the shoe web portions of each shoe having the toe end thereof connected to one actuator and the heel end thereof convexly curved to provide portions to roll and slide along the anchor plate ramp surface adjacent the other actuator, and resilient means continuously urging each of said brake shoes into engagement with the associated actuator and shoe supporting anchor plate ramp surface.

10. In a floating shoe brake assembly, a support plate, a pair of brake shoe actuators mounted on said support plate at diametrically opposed positions, fastener means fixedly connecting the actuators to the support plates, a substantially fiat anchor plate mounted on each of said actuator fasteners and independent of the actuator mounted on the same fasteners, each anchor plate having an edge portion arranged to provide a substantially radially extending shoe ramp surface, a brake shoe extending between each actuator and the anchor plate mounted on the fastener associated with the other actuator, said shoes each comprising a rim portion and a connected web portion, the shoe Web portions of each shoe having the toe end thereof connected to one actuator and the heel end thereof convexly curved to provide portions to roll and slide along the anchor plate ramp surface adjacent the other actuator, and resilient means continuously urging each of said brake shoes into engagement with the associated actuator and shoe supporting anchor plate ramp surface, said anchor plates each having an offset finger portion adapted to overlie portions of the adjacent actuator and to abut against and provide a guide slot for the web portion of the brake shoe supported by that anchor plate.

11. In a brake assembly, a support plate, a wheel cylinder mounted on said support plate by a fastener, bolt, an anchor plate independent of the wheel cylinder having first portions carried by the wheel cylinder fastener bolt and second portions connected to said support plate so as to be non-rotatably mounted on said support plate, said anchor plate having a third edge portion thereof formed to provide a substantially radially extending brake shoe anchor ramp.

12. In a brake assembly, a support plate, a wheel cylinder mounted on said support plate by a fastener bolt, an anchor plate independent of the wheel cylinder having first portions carried by the Wheel cylinder fastener bolt and second portions connected to said support plate so as to be non-rotatably mounted on said support plate, said anchor plate having a third edge portion thereof formed to provide a ubstantially radially extending brake shoe anchor ramp, a floating brake shoe having the heel end thereof engaged with said anchor ramp and formed with portions adapted to roll and slide along said anchor ramp, said anchor plate having a fourth ofiset finger portion arranged to extend parallel to and engage portions of the associated brake shoe to guide the movement of said shoe and resist cocking thereof, and resilient means connected between the finger portion of the anchor plate and the associated shoe.

13. In a brake assembly, a support plate, a wheel cylinder mounted on said support plate by a fastener bolt, an anchor plate independent of the wheel cylinder having first portions carried by the wheel cylinder fastener bolt and second portions connected to said support plate so as to be non-rotatably mounted on said support plate, said anchor plate having a third edge portion thereof formed to provide a substantially radially extending brake shoe anchor ramp, a floating brake shoe having the heel end thereof engaged with said anchor ramp and formed with portions adapted to roll and slide along said anchor ramp, said anchor plate having a fourth offset finger portion arranged to extend parallel to and engage portions of the associated brake shoe to guide the movement of said shoe and resist cocking thereof, and resilient means connected between the finger portion of the anchor plate and the associated shoe, said resilient means being arranged to exert a force on the shoe urging the shoe against the anchor plate ramp with said force arranged to act along a line normal to the'anchor ramp surface.

References Cited in the file of this patent UNITED STATES PATENTS 1,878,911 Stoner Sept. 20, 1932 2,041,463 Frank May 19, 1936 2,495,074 Mossey Jan. 17, 1950 2,509,643 House May 30, 1950 2,578,285 Butterfield Dec. 11, 1951 2,583,888 Schnell Jan. 29, 1952 2,595,143 House Apr. 29, 1952

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