Abstract: The invention relates to a brake shoe retainer mounting assembly. The assembly has a cylindrical anchor pin with through bore. This pin is located to extend through the brake shoe and through a brake spider. A retaining washer is located at either end of the pin and the assembly is held in position by a fastener which extends through the bore.

Abstract: A drum brake or clutch has a fixing member, a drum adapted to be rotatable relative to the fixing member, a pair of arcuate shoes disposed within the drum such as to come in and out of contact with the drum, an actuating device attached to the fixing member and having an actuator adapted to act on at least one end of each of the shoes, and a return spring acting such as to separate each of the shoes from the drum. The drum brake or clutch further includes a lever member pivotally attached to one end portion of each of the shoes. The lever member has one end thereof engaged with the actuator of the actuating device and the other end thereof engaged with an abutment member provided on the fixing member.

Abstract: An improved spider assembly (46) for expanding shoe drum brakes (10) of the type utilizing cantilever mounted anchor pin members (18) is provided. The anchor pin includes a pivot surface portion (62) and a slightly enlarged headed portion (66) extending from the outboard side of the spider member (14). A specially configured washer (80) is slidably received upon the pivot surface portion of the anchor pin and is of a sufficient outer diameter (82) to axially retain the brake shoe webs (26) upon the anchor pin. The washer (80) is provided with a radially extending portion (94) and an axially extending portion (84) extending from the outer periphery of the radially extending portion at a diameter (86) greater than the outer diameter (88) of the anchor pin.

Abstract: A drum brake spider assembly (100) for an expanding shoe drum brake (10) having a removable anchor pin (18) is provided. A spider member (14) is provided with an anchor pin receiving bore (39) in which the anchor pin is removably received. The anchor pin receiving bore is provided with a first counterbore (114) at the inboard end thereof and a second counterbore (118) at the outboard end thereof. The anchor pin is provided with two annular grooves (122 and 124) in which are received first and second snap rings (128 and 130). The diameter (116) of the first counterbore is smaller than the outer diameter of the first snap ring when the snap ring is radially expanded sufficiently to remove same from the first groove in the anchor pin.

Abstract: An improved expanding shoe drum brake (10) is provided. The brake includes a pair of brake shoes (20) pivotably retained on an anchor structure (18). The shoes include brake tables (22) and webs (26), the webs are resiliently urged by a spring (132) into constant sliding engagement with three guide surfaces (78, 88 and 114) to locate the webs on a plane (P) relative to the spider and to retain a substantially parallel relationship between the shoe friction material (24) and the brake drum (12) thereby minimizing the required running clearance (44) or slack of the brake.

Abstract: A spider for a brake having dual web brake shoes to be utilized at the wheel end of a heavy duty truck or trailer axle includes a pivoting end support plate mounted at a hole therethrough at a first axial location on the axle to extend radially outwardly therefrom to include at its extended end a pair of pivot pins for the support of each of the webs of each brake shoe. An actuation support plate is mounted at an opening therethrough at a second axial location on the axle which is separated from the first axial location. The extended end of the actuation support plate is capable of supporting a cam actuator which will operate on the opposite ends of the brake shoes from the pivot pins. There are included side plates which extend axially along opposite sides of the axle to secure the pivotal support plate and the actuation support plate to each other.

Abstract: An improved spider-anchor pin assembly (14) for a drum brake (10) is provided. The improved assembly includes a stamped sheet metal spider body (42) and a one-piece forged anchor pin piece (46) removably attached to the spider body by a plurality of threaded fasteners (82, 84). Preferably, the anchor pin piece is symetrical about a plane (P) extending normal to the axis of the anchor pin sections (94 and 96) and bisecting of the flange section (76) thereof.

Abstract: An anchor pin assembly (100) for a drum brake (10) is provided. The anchor pin assembly is mountable to a drum brake spider (14) provided with an anchor pin receiving bore (34). The assembly includes two anchor pin pieces (102 and 104) having inclined ramps (116 and 118) formed on the inner ends thereof, an expansion member (120) having mating ramps (122 and 124) formed thereon and a bolt (132) and nut (138) for applying an axially inward compressive force to the pieces to cause radially outward expansion of the expansion member.

Abstract: A drum brake assembly includes a pair of brake shoes (16, 18) which are movable by a hydraulic actuator (14) to a braking position. A parking brake lever assembly (24) is operable to also move the pair of brake shoes to the braking position. An anchor assembly (40) is attached to a backing plate (12) and is engageable with the pair of brake shoes to either absorb braking torque during a service brake application, or impart movement from one brake shoe to the other during a parking brake application. The anchor assembly includes a connecting member (44) engageable with the pair of brake shoes and rotatable in response to operation of the parking brake lever assembly to a released position on the anchor assembly (40).

Abstract: An improved drum brake (10) is provided with an improved retaining spring (28) which passes over or close to the axis of the brake anchor structure (18). The improved retaining spring is a one-piece coil tension spring comprising a coil portion (46) and an attachment portion (50) extending axially from the opposite ends of the coil portion. Each attachment portion comprises a downwardly extending first section (52), an upwardly and outwardly extending second section (56), a downwardly extending third section (62) and an axially extending fourth section (64).

Abstract: A wheel cylinder and torque plate construction is provided for a drum brake. The wheel cylinder comprises a molded plastic cylindrical member in a steel shell. The steel shell can be part of a torque plate which can be stamped in two parts which are substantially identical and then affixed together. The torque plate parts have semicylindrical shells which form the wheel cylinder shell when the parts are assembled. The plastic cylinder can be molded in the shell in a suitable die or mold in a plastic molding machine.

Abstract: In a drum brake assembly a pair of brake shoes (12, 14) are carried by a backing plate (10) and are engageable with the brake drum (18) to effect a service brake application. A parking lever (26) cooperates with the pair of brake shoes to engage the shoes with the brake drum and effect a parking brake application. A connector (34, 84, 94, 96) is slidably carried by the backing plate and pivotally anchors at least one of the brake shoes to the backing plate. The connector (34, 84) or another structure (128) transmits braking torque from one brake shoe to the other only during a parking brake application. The connector is releasably secured to the backing plate in a fixed position by a latch (36, 88, 114) which is connected to the parking lever. Movement of the parking lever to a position effecting a parking brake application causes the latch to release the connector for sliding movement relative to the backing plate.

Abstract: The present invention relates to a brake shoe and brake assembly for automotive vehicles, comprising a pair of brake shoes (14) having ends pivotably mounted on a brake spider (12), and a actuator cam (26) located between the opposite ends of the brake shoes (14). The webs (24) of brake shoes (14) have adequate apertures in the pivoting ends, to engage rotational anchor pins (16). The apertures have radial sections and lateral flats to engage radial sections and lateral flats in the ends of the anchor pins (16). The apertures form slidable, but not rotational, connections with anchor pins (16), to support brake shoes (14), and allow a pivoting movement of brake shoes (14), through anchor pins (16), when an application and release of the brake is effected.

Abstract: A brake support assembly to be mounted on a vehicle axle housing for supporting a brake shoe assembly and an actuator therefor comprising a backing plate adapted to be fixedly mounted on a vehicle axle housing and two anchoring plates removably attached to the backing plate for pivotally supporting the brake assembly. Each anchoring plate includes projections which correspond to bores in the backing plate for positioning the anchoring plate at a predetermined position on the backing plate whereby the anchoring plate may be removed and replaced while maintaining a constant positioning of the brake assembly. In a first embodiment, the anchoring plate includes integral projections extending therefrom. In a second embodiment, the anchoring plate includes a tapered bore extending therethrough for supporting a pin. The pin extends from the plate defining the projection which corresponds with the bore in the backing plate.

Abstract: An anchor plate is disclosed for a drum brake assembly having a backing plate and a pair of brake shoes arranged in end-to-end relationship thereon. The anchor plate engages a knob integral with the backing plate, the knob extending from the backing plate a distance to extend into the plane defined by the brake shoe webs. The backing plate knob defines a pair of knob faces, each knob face facing a corresponding brake shoe web. Disposed in overlying and force-fit engagement with the knob is an anchor plate of thin material having a planar surface and two substantially perpendicular tabs extending therefrom. The tabs define load bearing surfaces for receiving the brake shoe webs. The tabs are spaced apart a distance equal to, but preferably slightly less than, the distance between the knob faces for snug intereference fit therewith. The planar top surface of the anchor plate has, integral therewith, retaining tabs extending substantially parallel to, and overlying the brake shoe webs.

Abstract: A vehicle drum brake has a shoe mounted on a back plate, one end of the shoe engaging an actuator and the other end engaging an abutment. To avoid the use of a fluid pressure control valve to vary the braking effort of the brake in dependence upon vehicle loading, the abutment is in the form of a roller which engages an arcuate member on the shoe, the roller being movable laterally of the shoe to vary the braking effort for a given actuating force. The roller may be connected to a pivoted lever which is rotatably mounted in the back plate and which is connected to a sprung part of the vehicle by a linkage. Movement of the sprung part due to changes in vehicle loading rotates the lever and moves the roller.

Abstract: In a drum brake assembly a hydraulic actuator is engageable with a pair of brake shoes to move the same into engagement with a rotatable member. A parking lever also cooperates with the pair of brake shoes to move the same into engagement with the rotatable member and an anchor plate forms a connecting member between the pair of brake shoes. A backing plate supports the pair of brake shoes and the anchor plate. The anchor plate is movably supported by the backing plate and a latch cooperates with the anchor plate in a first position to fix the anchor plate to the backing plate. The latch is movable to a second position spaced from the anchor plate to permit the latter to move relative to the backing plate. In order to control the position setting of the latch, the latch is coupled to the parking lever so that the latch remains in the first position until the parking lever is moved whereupon the latch is also moved to the second position.

Abstract: A drum brake used in a vehicle generally includes a backing plate secured to a non-rotatable member of a wheel shaft; a pair of brake shoes slidably attached to the backing plate; a wheel cylinder disposed between one end of each brake shoe, where they are closely positioned to each other; an anchor disposed between the other end portion of each brake shoe where they are again closely positioned to each other, and having an anchor block on which each end portion of the brake shoes abuts and an anchor bracket secured on the anchor block for protecting each brake shoe from swinging out; and a substantially U-shaped return spring engaged with each web portion of the brake shoes for biasing the shoes in a mutually approaching direction.

Abstract: A brake assembly including a pair of brake shoes having adjacent ends pivotally mounted to a support and an actuator disposed between the ends of the brake shoes. The brake shoe webs are recessed at one end to engage a fixed anchor pin. The recess provides an arcuate bearing surface adapted to bear against a portion of the pin and permit pivoting movement of the brake shoe about the pin as the brake is actuated and released. The recess is also so oriented relative to the pin that the recess abuts the pin and prevents the brake shoe from moving away from the anchor pin. The brake assembly also includes an anchor pin having axially spaced cylindrical bearing areas adapted to radially, slidably receive the open ended recesses of a dual web brake shoe and a pair of oppositely facing surfaces extending radially outward at axially spaced locations on the pin to abut the brake shoe webs and prevent the anchor pin from being axially displaced from the support.

Abstract: A brake assembly for a vehicle includes a stamped spider member, an air chamber mounting bracket attached to one end of the stamped spider member, a cam shaft supported in the air chamber mounting bracket having an S-cam member affixed to one end thereof, cam spacer selectively locatable on the cam shaft for adjusting the relative position of the S-cam and the spider member, and an anchor pin supported on the spider member opposite from the air chamber mounting bracket with the anchor pin being supported in a cantilevered fashion at one end thereof by the spider member. A pair of brake shoes are provided having an anchor pin end engaging the anchor pin and an S-cam end engaging the S-cam member. Rotation of the S-cam effects pivotal movement of the braking shoes about the anchor pin to brake a vehicle associated therewith. An anchor pin spacer is selectively locatable on the anchor pin to selectively adjust the relative position of the brake shoes and the spider member.

Abstract: A drum brake assembly includes a backing plate which supports a pair of brake shoes and a hydraulic actuator cooperates with the pair of brake shoes to move the latter to a braking position. An anchor pin extends from the backing plate to oppose torque developed by the pair of brake shoes during braking. In order to align the pair of brake shoes with the hydraulic actuator, a single clip is carried by the anchor pin and the clip opposes axial movement between the backing plate and the pair of brake shoes opposes separation between the backing plate and the hydraulic actuator. In an alternative embodiment the single clip forms a hook at one end to releasably engage the backing plate.

Abstract: In an internal shoe-drum brake a thrust transmitting member is interposed between a shoe-end and an abutment for that shoe-end. The thrust transmitting member has a planar face engaging with the abutment and an arcuate face which is received in a complementary recess of arcuate outline in the shoe-end.

Abstract: The brake assembly in an air brake system where the brake shoes have double mounting flanges is simplified both as to ease of assembly/disassembly and as to number of conponents by anchoring each brake shoe so that, in operative position, it is fixedly pivoted on an anchor pin but may be pivoted out of operative position around the anchor pin to a position in which it may be disengaged therefrom.

Abstract: A hoist is described which combines a block and tackle with a windlass. A drum brake and operating linkage therefor incorporated into the hoist is to automatically provide braking to prevent a load from causing unwanted reverse rotation of the windlass. Lowering of the load is achieved by applying against the pressure of the brake sufficient reverse rotational force to overcome the brake resistance and cause lowering. The brake shoes have a common pivot point whose location with respect to the brake drum can be changed to adjust the relative degree of braking provided by each of the shoes. The hoist also includes mechanism which prevents the hoist line from being wrapped around the hoist in a direction which would render the brake applying linkage ineffective.

Abstract: A drum brake for a motor vehicle includes a backing plate secured to a nonrotatable portion of the motor vehicle. The backing plate mounts a hydraulic actuator which, in turn, carries a pair of brake shoes. The backing plate includes a first portion that attaches to the nonrotatable portion of the motor vehicle and a second portion that extends radially from the first portion. The second portion includes an opening and the hydraulic actuator extends into the opening for mounting the same on the second portion. The pair of brake shoes define a space therebetween and the backing plate is radially disposed substantially within the space. A shield engages the backing plate and extends radially past the pair of brake shoes to engage the pair of brake shoes in order to guide the radial expansion of the latter during braking.

Abstract: A drum brake assembly for a vehicle wheel includes an axle housing flange extending upwardly and provided with an opening through which the wheel cylinder hydraulic line input and bleed fittings extend. A thin wall backing plate is secured to the flange and supports the wheel cylinder but does not take brake torque. The anchor pin is assembled through the backing plate directly to the flange, also fastening the backing plate to the flange at this point. This provides a precise anchor pin location with the anchor pin also acting as a braking unit mounting bolt, taking the place of two mounting bolts in common usage. A pair of backing plate mounting bolts generally opposite the anchor pin also secure the backing plate to the flange. The wheel cylinder is retained on the backing plate by a wire clip instead of the commonly used mounting bolts. The brake shoes, springs and other control elements are mounted on the backing plate in the usual manner.

Abstract: An abutment assembly for an internal shoe drum brake, particularly a vehicle wheel brake, comprising opposed abutment members for engagement with respective brake shoes and an arrangement for transmitting forces between the abutment members. The arrangement comprises a deformable member contained within a recess in one abutment member and sandwiched between the abutment member and a piston in force transmitting relation with the other abutment member. The deformable member has different areas of engagement with the piston and the one abutment member so that only a part of the thrust applied to one abutment member is transmitted to the other abutment member.

Abstract: A brake assembly including a pair of brake shoes having adjacent ends pivotally mounted to a support and an actuator disposed between the ends of the brake shoes. The brake shoe webs are recessed at one end to engage a fixed anchor pin. The recess provides an arcuate bearing surface adapted to bear against a portion of the pin and permit pivoting movement of the brake shoe about the pin as the brake is actuated and released. The recess is also so oriented relative to the pin that the recess abuts the pin and prevents the brake shoe from moving away from the anchor pin. The brake assembly also includes an anchor pin having axially spaced cylindrical bearing areas adapted to radially, slidably receive the open ended recesses of a dual web brake shoe and a pair of oppositely facing surfaces extending radially outward at axially spaced locations on the pin to abut the brake shoe webs and prevent the anchor pin from being axially displaced from the support.