Abstract: A hydraulic caliper disk brake (10) according to the present invention includes a caliper base (46) that is supported by a folding triangular base (14) that generally includes a mounting base (30) and a support arm (54). The caliper base (46) is pinned to the mounting base (30) and the support arm (54) such that the caliper base (46) may pivot about the mounting base (30) when the pin connecting the support arm (54) to the mounting base is removed. The configuration allows the caliper assembly (12) to be pivoted out, away from a brake disk (16) such that the friction pads (142, 242) may be easily replaced. The caliper assembly (12) includes a self-activating wear adjuster (172) that functions to maintain a constant brake gap (174) between an active friction pad (142) and the brake disk (16). The caliper assembly (12) also includes a wear indicator in the form of a spring (134) that provides additional force that is fed back to the user when the friction pad (142) is significantly worn.

Abstract: A floating caliper-disc type brake is capable of defining a second gap between a disc and an outer pad when the same brake is released, preventing a dragging torque from being generated during the traveling of a vehicle, improving fuel consumption of the vehicle, and solving a jar generated when the outer pad is slid with respect to the disc.

Abstract: A clutch assembly has a clearance between the piston and the clutch pack when the clutch is disengaged. This clearance is set and maintained by a one-way mechanism which establishes the limit of linear movement of the clutch piston during piston retraction or disengagement of the clutch.

Abstract: There are disclosed several embodiments of a disc brake caliper assembly in which adjustment is made for wear on the pads by a non-rotating linearly expandable and retractable linkage arranged between a brake actuator and the pads. The linkage includes inner and outer members coaxially reciprocal without rotation with respect to one another, one member having surfaces which extend at acute angle with respect to the axis and opposite surfaces on the other member which extend parallel to the axis. Circumferentially spaced wedges are disposed in the space between the angled and parallel surfaces, and springs between the first member and wedges yieldably urge the wedges in the first longitudinal direction toward the angled surfaces, the second member being movable during the braking cycle in a second longitudinal direction and thus relatively to the first member, whereby the linkage is caused to expand in order to adjust for wear.

Abstract: Apparatus for automatically compensating or adjusting for the slack or added travel as frictional material on brake pads wears during repetitive brake applications. A stack of snap rings each having a gap in its periphery is collapsed or compressed and assembled onto the inside diameter of a wall of a hydraulic pressure applied cylinder portion. The wall inside diameter has a shoulder with a first diameter that holds the snap rings in their compressed condition. Contiguous to that section is a second wall section having a diameter larger than the first section such that as the cylinder is extended further during a braking action because of wearing of the brake pads, one of the snap rings is forced into the larger diameter area thus expanding it and preventing the wall portion of the cylinder from returning to its original position, thus maintaining the gap constant.

Abstract: A slack adjusting brake cylinder for use in a fluid brake unit of a railway transit vehicle having a brake piston slidably mounted on a support rod within a brake cylinder receiving cavity of the brake unit. A plurality of friction/load rings are slidably mounted on the support rod, a first side of which serves as an abutment stop to limit the extent of return of the brake piston along the support rod. The friction/load rings are tightly engaged on the support rod so that they are slidable only in response to fluid brake pressure forces. A spring loaded compression member is engaged with a second side of the friction/load rings, and is partially compressed between the brake piston and the friction/load rings when the brake piston is advanced outwardly on the support rod in response to activation of the brake unit, and functions to return the brake piston into engagement with the friction/load rings when the brake unit is deactivated.

Abstract: The invention is directed to a stop pin for a hydraulically actuated brake. The stop pin is provided with a rotation prevention portion for preventing relative rotation between the hydraulic brake piston and the brake housing. The stop pin is provided with a threaded mounting portion for mounting the stop pin to the annular hydraulic brake piston. A hex portion is located adjacent to the threaded mounting portion to facilitate assembly of the stop pin in the hydraulic braking piston. On the other side of the hex nut portion, opposite the threaded mounting portion, the stop pin is provided with a rotation prevention portion which cooperates with the sidewalls of a stop pin bore in the brake housing to prevent relative rotation between the annular piston and the housing. A screw is screwed into the rotation prevention portion and defines a shaft and cap on which is mounted a split sleeve. The split sleeve engages the sidewalls of the stop pin bore and defines the brake release distance.

Abstract: The drum brake wheel cylinder (20) comprises a longitudinal through bore (16) having therein a pair of opposed pistons (22, 24) with each piston (22, 24) engaging a respective web (12, 14) of an adjacent drum brake shoe. A first piston (22) includes a longitudinal opening (32) receiving therein one end (62) of a friction rod (60), and the second piston (24) includes a recess opening (27) receiving therein the second end (64) of the friction rod. A friction latch adjusting lever (50) has a central opening (52) receiving therethrough the friction rod (60) and is located diagonally relative to a longitudinal axis of the friction rod (60). A spring (70) is located about the friction rod (60) with one end biasing the friction latch adjuster lever (50) against a wall (34) of the first piston (22) and the other end of the spring engaging an abutment (27B) in the recess opening (27 ).

Abstract: A floating-caliper spot-type disc brake is disclosed having an arrangement for actively retracting the indirectly actuated external brake shoe to create a clearance with the brake disc. Elastic spring elements (24, 34, 38, 45) engage the external brake shoe (10) and the carrier arms (2, 3) of the brake carrier (1) and which are elastically tensioned by actuation of the brake to allow a slight retraction of the external brake shoe when the elements relax as the brake is released. The spring elements are mounted to allow a frictional grip to be overcome to shift the relative relaxed position of the spring element and external brake shoe as the brake lining wears, so that a constant disc clearance is maintained.

Abstract: A railway brake actuator which provides both service and parking braking comprises a cylinder having an operating cavity. A piston assembly in the operating cavity has a stepped bore forming second and third cavities and is extended by hydraulic pressure and retracted by a spring to apply and release the service brake. Hydraulic pressure extends a hollow parking brake piston from the second cavity to extend the piston assembly and apply the parking brake. A one-way clutch comprising ramps and rollers locks the piston in parking brake applied position. Hydraulic pressure disables the clutch to enable spring retraction of the parking brake piston and the piston assembly to release the parking brake. A gripper ring on the piston assembly operates between cylinder abutments to limit piston assembly retraction to provide slack, and enables slippage on the piston assembly on extension to adjust for brake wear.

Abstract: A fluid operated friction clutch has a power piston which is selectively pressurized to urge a presser plate into abutment with a clutch disc pack to enforce frictional engagement thereof. The presser plate has an inner annular surface which is axially aligned with an adjuster sleeve which frictionally engages a clutch hub. The adjuster sleeve has a plurality of fingers or tangs which engage the presser plate to enforce relative movement between the sleeve and the hub until full engagement of the clutch pack is attained. The sleeve also has a lip or tang which limits the retraction of the presser plate from the clutch engaged position thereby establishing the free-running clearance of the clutch pack.

Abstract: An actuator mechanism for a braking system employing multiple disc brakes to insure an air gap between the pressure plate of the brake stack and the piston head of a piston. The piston is mounted in a cylindrical housing with an end wall to which a rod is secured. The rod extends into the piston and has a hardened ball on its end for engagement by a deformable sleeve. The deformable sleeve is connected to an outer cylindrical tube for movement therewith. Such outer tube has a flange on one end that slidably engages the cylindrical wall of the piston and a ring on the other end that is adapted to engage an annular spring retainer member slidably mounted on the outer tube. The piston has an inwardly extending annular abutment that engages the retainer member with a coil spring encircling the outer tube having one end engaging the flange and the other end engaging the retainer member to provide widely spaced footprints for the spring.

Abstract: The present specification discloses a clamp member and a torque taking member with the clamp member being slidably mounted on the torque taking member by at least one sliding pin connection, whereby the clamp member can slide relative to the torque taking member to apply a friction pad to each side of a braking disc. The at least one pin connection comprises a pin which engages in a bore with a flexible sleeve located on the pin, the flexible sleeve engaging the wall of the bore. The pin has a two part construction with the flexible sleeve located between said parts, said parts being secured together so as to deform the flexible sleeve radially outwardly into engagement with the wall of the bore.

Abstract: A fail safe self-adjusting brake is disclosed in which a service piston selectively actuates brake discs to contact shaft discs and apply braking to the shaft. The service piston is hydraulically actuated. Should there be a system failure an emergency piston forces the service piston to brake shaft rotation. The service and emergency pistons are uniquely mounted such that they are properly guided within the brake housing. In a further feature of the present invention, the location of the brake discs relative to the shaft discs is adjustable to vary the amount of movement necessary to cause braking. This adjustment allows the brake discs to move relative to the housing to accommodate wear on the brake or shaft discs. A gage is mounted within the housing to monitor the amount of adjustment of the brake discs, and thus to give an indication of the wear on those discs.

Abstract: An electromagnetic brake is disclosed which comprises a brake wheel, a friction surface touching the brake wheel during braking and attached to an anchor plate moved by brake springs and an electromagnet which disengages the friction surface from contact with the brake wheel when a current is supplied to the magnet. To compensate for the wear of the friction surface, the brake has at least one retainer mounted on a bolt or shaft lying parallel to the axial direction of the brake. The retainer moves with the anchor plate towards the brake wheel and is provided with a directional element which limits the motion of the anchor plate away from the brake wheel. The brake is also provided with a wedge ring rotated by a spring which serves to move the electromagnet towards the brake wheel.

Abstract: A brake actuator for a railway brake which provides both service and parking braking comprises a cylinder having an operating cavity. A piston assembly extends into the operating cavity and has a stepped bore including second and smaller third cavities. A first hydraulic supply admits pressurized hydraulic fluid into the operating cavity to extend the piston assembly to apply the service brake. A spring applies a retracting force on the piston smaller than the hydraulic force. A hollow parking brake piston carried in the second cavity extends to react against the cylinder and extend the piston assembly in response to the supply of pressurized fluid to the second cavity from a second hydraulic supply to apply the parking brake. A mechanical lock, comprising a one-way clutch utilizing ramps and rollers, locks the piston extended from the piston assembly cylinder to maintain the parking brake applied upon removal of the second hydraulic supply force.

Abstract: A multiple disk brake is disclosed which includes a pusher movable toward and away from a friction surface, spring means urging the pusher away from the friction surface, at least one bush slidable to an interference fit within a corresponding seat of the pusher to limit a return stroke of the latter, at least one corresponding link for limiting to a predetermined length the movement of the bush relatively to a brake abutment surface, which comprises a spacer between a head of the link and the abutment surface. Thus, the effect of the machining tolerances of the link components on restoration of an optimum clearance between the pusher and the friction surface is attenuated.

Abstract: The invention relates to a wheel cylinder for a drum brake, comprising a body (2) provided with a longitudinal bore, two pistons (4,6) sliding in opposite directions outwards in the bore under the action of a pressurized fluid introduced between the pistons against the return springs of the shoes of the brake, and a mechanism limiting the return travel of the pistons when the pressure is released. According to the invention, the mechanism limiting the travel consists of two resilient rings (16, 18), at the outer periphery of each of which a friction mechanism (20, 22) is disposed, and which are disposed, respectively, in an annular groove (24, 26) made in each of the pistons so as to provide a specific axial clearance (d) between a radial wall of the groove and the adjacent side of an assembly consisting of the resilient ring and the friction mechanism, this assembly being provided in order to resist the return springs of the brake shoes in a drum brake.

Abstract: A disc brake caliper seal arrangement wherein an annular seal is provided between the caliper housing and the outside diameter of the piston provided therein. The seal provides a rollback function which returns the piston to a given running clearance between the disc rotor and brake pads after actuation of the brake. The seal is provided in a substantially square or rectangular cross-sectional configuration and is disposed in a seal groove of the caliper housing. The seal is provided with annular recesses on the ends of the parallel sides of the seal adjacent to the outside diameter of the piston. The central portion of the side of the seal which engages the outside diameter of the piston is provided with a circumferential groove. The recesses provide space of sufficient volume for the seal to deflect into before encountering the straight groove side wall, thereby eliminating the need for a machined chamfer in the housing groove.

Abstract: An apparatus for a drum brake for mechanically actuatable self-energizing internal shoe-type drum brakes for automotive vehicles. A pair of brake shoes (4, 5) is arranged on a brake carrier plate (27) at a thrust member (6) and furnished with tension springs (7, 10). A mechanical actuating apparatus acts between a pair of brake shoe ends (4, 5) disposed opposite each other and prestressed by springs (7, 10). The mechanical actuating apparatus presses the brake shoes (4, 5) for braking against a brake drum (1) enclosing them and a first automatically clearance compensating adjusting device is arranged between the brake shoe ends as well as a second adjusting device arranged at at least one brake shoe web (12) supporting the brake shoe (5).

Abstract: An improvement in a conventional air-operated diaphragm spring brake is provided by a guide (100) being disposed in registry with an aperture (26) in a service brake housing (16). A push-rod (10) extends from a diaphragm (58) within the housing (12) through the bushing (102) to pivotably connect to a slack adjuster (6). The bushing (102) serves to maintain the push-rod (10) at a preselected angle relative to the slack adjuster (6) when the push-rod is in the inoperative position.

Abstract: An automatic air gap readjusting assembly in a clutch or brake unit is operated by electromagnetic and spring forces. A drive shaft 3 frictionally mounts, by a plurality of O-rings, an adjustment member. The adjustment member is readjusted by a contact or armature plate such that the air gap between the armature plate and the electromagnetic mechanism attracting the armature plate will remain constant, i.e. the stroke of the armature plate will remain constant. Torque is transmitted from the drive shaft to the armature plate via a radial flange having a plurality of axially movable torque transmitting bolt assemblies, which are clamped to an annular spring member secured to the armature plate. This arrangement allows for continuous readjustment for wear of the air gap between the armature plate and the electromagnetic mechanism; furthermore, the readjustment always takes place under uniform force conditions despite increasing wear.

Abstract: An electromagnetic motorbrake has three wear compensating studs with threaded portions that receive nuts. The threaded nuts define cylindrical wrap surfaces for spring clutch elements that are coupled between the armature and the pressure plate of the brake by a bellcrank to be sequentially wrapped to turn the nuts as required to automatically take up any excessive gap between the armature and the electromagnet due to wear of the friction disc between the armature and the pressure plate.

Abstract: A disc brake assembly comprises a caliper member that is rectilinearly movable relative to a support member via a pin member that slidably guides the caliper member while secured to the support member. A second pin member is secured to and movable with the caliper member while interconnected to the support member via a deformable elastomeric ring that aids in the return of the caliper member and the friction elements connected thereto upon termination of a braking operation.

Abstract: A brake having a brake carrier and saddle is disclosed in which a sliding bolt fastened to the saddle is received in a bore in the carrier. After actuation by the brake by hydraulic piston, the saddle is returned to its rest position by a compression spring. A friction element is provided between the sliding bolt in the bore for limiting the travel of the saddle in response to the bias of the spring. The friction element exerts a force greater than the bias of the spring but less than that exerted by the brake actuator, such that the brake is self-adjusting for lining wear. The brake is disclosed in plural embodiments.

Abstract: In a spot-type disc brake for motor vehicles a floating caliper is guided displaceably on a brake support by means of sliding pins (26). Inner and outer brake pads are likewise displaceably mounted parallel to the sliding pins with respect to the brake support. On at least one of the sliding pins a resetting means (50) with a spring (52) is provided which is arranged around the sliding pin as part of a frictionally locking connection between the sliding pin and a bore guiding said pin. The bore (24) comprises at the end from which the sliding pin is inserted into said bore a widening (54) into which the spring (52) is installed with axial bias. The spring or a member cooperating therewith is in engagement with an outer surface of the sliding pin.

Abstract: The brake piston return mechanism (10) comprises a housing (22) which includes housing part (50) that forms with the housing a chamber (59) and an axially extending groove (55). Disposed within the axially extending groove (55) and forming a movable portion (58) of the chamber (59) is an annular actuation piston (70). The actuation piston (70) includes a pair of seals (74) to prevent leakage. Within the housing part (50) is a bore (40) enclosing brake tube (80) that includes an interior radially extending flange (84) and an exterior radially extending flange (82). The exterior radially extending flange (82) is engaged by the actuation piston (70). Located within the brake tube (80) is an adjuster mechanism (90). After the brake tube (80) has been displaced by the actuation piston (70) and braking has ceased, the brake tube (80) is returned to a running clearance (A) by way of the adjuster mechanism (90 ).

Abstract: The present invention is concerned with a disc brake and in particular to a floating caliper spot-type disc brake. In the practice of the invention, a holding member in the area of a bore in the brake housing has a smaller diameter than the bore diameter.

Abstract: A hydraulic power unit for a hydropneumatic brake actuator having a power piston comprising a force piston formed with a bore therein and a take-up piston operative in the force piston bore for movement relative thereto during a brake application. This relative movement is controlled by a check valve device carried with the force piston to establish or interrupt fluid pressure communication between the respective pistons and establishes a positive clearance between a brake shoe and wheel tread, for example, during a subsequent brake release.

Abstract: An actuator assembly includes first and second components which are movable away from each other to initiate application of a brake, upon pressurization of a pressure space between the components.

Abstract: A hydropneumatic brake actuator having a friction member positionable by a power piston during a brake application stroke through a lost-motion connection therewith to establish a stop to limit return movement of the power piston during a brake release and thereby provide a predetermined brake shoe clearance. The friction member comprises an elastomeric-type O-ring that can be compressed axially to varying degrees, thereby adjusting the radial force that the O-ring exerts on the piston bore.

Abstract: The brake motor comprises an inserted piston (26) slideably mounted in a passage (24) formed in the front wall (4) of the brake piston (1) which has, near the other end (31) of the inserted piston (26), a counter-bearing surface (34) facing inward, thus enabling the engagement of an actuating tool (0) to exert, via the inserted piston (26), an axial thrust on the rotating member (16) of the automatic adjustment device of the brake motor and, at the same tine, an axial load in the opposite direction on the brake piston (1) enabling the friction clutch (18, 19) to release between the brake piston (1) and the rotating member (16), after which an axial translation (F) of the assembly enables the resetting of the automatic adjustment device of the brake motor.

Abstract: A self-adjusting cable control device for automatically compensating for wear in a control cable system. The device includes a termination member connected at one end of a control cable and a connecting member attached to an actuation member. The connecting member carries a clutch for locking with the termination member upon application of force to the actuation member. A spring is provided to move the cable with respect to the actuation member when the clutch is disengaged from the termination member. The clutch comprises a plurality of collet members which are hinged to the connecting member and are movable radially toward and away from and surround the termination member. The collet members have conical surfaces at one end adapted to engage complementary conical surfaces on the connecting member and serrations which engage complementary serrations on the termination member.

Abstract: The compact brake piston-return mechanism (10) comprises a housing (22) having a bore (40) with a longitudinal sleeve (50) received fixedly in said bore (40). The sleeve (50) has a through opening (56) receiving therein a piston (60) which extends exteriorly of the through opening (56) to an enlarged diameter portion (69) for engaging a brake stack (32, 35, 36). The piston (60) has an interior opening (66) in which is disposed a deformable member (80) connected by means of a ring (70) with the piston (60). A deforming member (90) is disposed within said deformable member (80), deforming member (90) extending axially through an aperture (63) at an end (62) of the piston (60) disposed within said bore (40). The deforming member (90) includes a radially extending member (94) which has an axially extending portion (95) that encircles interior ends (52, 62) of the sleeve (50) and piston (60).

Abstract: A floating caliper disc brake including a fixed mounting block, a caliper mounted to float on the fixed mounting block and being located in a position to bridge the edge of a disc, a first friction pad supported by the caliper for movement into engagement with one side of the disc, a housing mounted on said caliper on the opposite side of the disc, a second friction pad supported in the housing for movement into engagement with the other side of the disc, the caliper moving in response to the engagement of the second friction pad with the disc to move the first friction pad into engagement with the other side of the disc and a rubber spring on the mounting block to bias the caliper on release of the second friction pad from the disc to release the first friction pad from the disc, the caliper being free to move with respect to the ribs wherever the retraction capability of the ribs is exceeded by the movement of the caliper.

Abstract: The brake assembly (10, 110, 210) comprises a caliper housing (14, 114, 214) having a bore (26, 226) with a first piston (30, 230) slidably received therein. The first piston (30, 230) includes a recess (34, 234) receiving the head (52, 252) of a longitudinally extending rod (50, 250), the head (52) displaced from a surface (35) of the recess (34) by a resilient mechanism (37). The piston (30, 230) has a first seal (40, 240) disposed thereabout. The longitudinally extending rod (50) has an end (54) with a second seal (60) disposed thereabout, the end (54) received slidably within a tube (70) having a flange (72). The flange (72) of the tube (70) has a first spring (80, 180) located thereabout, the first spring (80, 180) biasing tube (70) away from a second piston (90) positioned about the tube (70) and rod (50 ).

Abstract: A disc brake comprises a caliper member (14) which is movably supported relative to a torque member (12) by at least one pin assembly (46). The one pin assembly comprises a first part (50) and a second part (54) with a resilient member (70) therebetween. The resilient member (70) cooperates with the parts (50, 54) and the caliper member (14) to positively retract a friction element (24) upon termination of braking.

Abstract: Brake linkage for vehicle friction brakes is actuated by a brake power motor (6) and comprises a vent play regulator (10) having an adjustment element driven by an auxiliary motor (14). At the start of braking, the auxiliary motor (14) is actuated in advance of the brake power motor (6), causing application of the vehicle friction brake through the adjustment element. The brake power motor is then activated and tightly clamps shut the friction brake. The brake linkage is particularly suitable as a brake clamp (5) for disc brakes, the vent play regulator then being integrated into the pull rod (11).

Abstract: A first piston having a passageway for hydraulic fluid and a second piston slide within a cylindrical body of a jack for crown or disk brakes provided with a spring for opening the brake clamp or yoke. An extension of the first piston slides within a guide and actuates a movable pusher. A closure seal closes the passageway when the first piston touches the second piston. The axial friction force of the second piston on the cylindrical body is more than the force of the spring. The axial friction force of the second piston on the cylindrical body is more than the sum of the axial friction force of the first piston on the cylindrical body and the axial friction force of the extension on its guide, whereby the axial displacement of the first piston occurs before the axial displacement of the second piston when said pistons are actuated by same pressure.

Abstract: An automatic adjusting device which is disposed midway of a control wire connecting an actuating mechanism such as a brake and an operating lever. The automatic adjusting device automatically compensates not only the internal wear of the actuating mechanism but also the extension of the control wire so that it can always take up any excessive play or slack of the control wire to thereby impart to the operating lever a minimum play, which corresponds to the proper ineffective stroke of the actuating mechanism.

Abstract: A disc brake includes a caliper assembly with a reaction leg and an actuation leg on opposite sides of a rotor. The caliper assembly includes a pair of end bridges and an integrally formed center bridge to connect the legs together and substantially prevent deflection between the legs.

Abstract: The braking system incorporates at least one brake disc (36) sliding on a rotating driving component (22) capable of being braked by way of friction components (44, 50). The sliding disc (36) is provided with a device for returning and memorizing a position (60) enabling the disc to be always at the same predetermined distance relative to one of the friction components (44) when the brake is not applied, irrespective of the state of wear of the friction component (44). Applicable to motor vehicle braking systems.

Abstract: A spot-type disc brake for automotive vehicles, having brake shoes arranged on both sides of a brake disc. A brake support member receives the brake torque. The support member bears guide rods in which a brake caliper which straddles the brake disc is guided slidably on the brake support member. The brake caliper is provided with an actuating device to urge the brake shoes against the brake disc. The brake caliper is resiliently preloaded in the brake's release direction and with the spring force being maintained constant independently of the pad thickness by the position of a friction element that is slidably supported at the brake support member. After braking actions that result in an elastic expansion of the brake caliper, there is available a sufficient brake clearance immediately upon termination of the braking action, by the use of the friction element being arranged in a sleeve to allow axial movement by the amount of the clearance.

Abstract: A brake wear adjuster is mounted within the bore of an actuator piston having a snap ring at the entrance of the bore. The adjuster includes a spring holder having a uniquely configured washer that is seated in a groove in the outer surface of the holder. A spring is carried about the holder between the washer and a flange at the opposite end of the holder. A pin having a mounted swage and a deformable swage tube are carried within the bore of the spring holder, the swage tube being movable with the holder while the pin and swage are stationary. Upon hydraulic fluid pressure being applied to the piston, the snap ring engages the washer and it in turn compresses the spring as it moves through the distance established in the groove. An occurrence of disk wear in the brakes causes the piston and holder to move further drawing the swage tube over the swage. Upon release of the pressure, the spring moves the washer and snap ring and thus also the piston to a retracted position to disengage the brake disks.

Abstract: A fluid pressure operated mechanism for a vehicular disk brake which includes two expansion elements capable of moving in opposite directions to each other. A compensating unit located between the two expansion elements to maintain a given stroke of the expansion elements and eliminate excess play which may be developed as a result of brake lining wear. The compensating unit takes the form of a one piece connecting link having return spring portions engaging one of the expansion elements and frictional gripping portions connected to the other of the expansion elements.

Abstract: A spring-applied, air-released parking/emergency brake is combined with an air-actuated service brake through a friction clutch between the parking/emergency brake piston and a first nut member that is threaded onto a screw rod of the service piston. The screw rod and service piston are connected through another friction clutch. The screw rod is provided with a second nut member that is integral with a thrust rod to which the brake rigging is connected. A friction lock slack adjuster arrangement limits retraction of the thrust rod during brake release in accordance with the desired brake shoe clearance to be maintained. When the thrust rod movement is inhibited by the slack adjuster, the service piston clutch becomes disengaged to permit rotation of the screw rod during the release stroke of the service piston corresponding to overtravel due to shoe wear. Brake shoe clearance is thus maintained constant.

Abstract: Suspension arrangement for actuation and abrasion dependent movable parts, especially brake pad holders (1) and non-rigid brake saddles, particularly of rail vehicle disk brakes having an abrasion compensation device, comprises a suspension bracket (7) which, on the one hand, is rigidly connected to the movable part (brake pad holder 1) or a fixed holding part, and which, on the other hand, is held at the respective other part by means of a sliding guide mechanism (8) extending parallel to the direction of motion and being self-locking under stress by a tilting moment of the suspension bracket (7) which is resiliently deformable in the direction of motion. The sliding guide mechanism (8) may be a bushing (9) displaceably held on a bolt (10), the length of the bushing (9) approximately corresponding to the diameter of the bolt (10). The suspension bracket (7) may be a leaf spring.

Abstract: A disc brake having a brake shoe wear compensating mechanism in which the sealing gaskets for the operating chamber formed between a pair of spreading members are arranged to be elastically deformable during a brake application, so as to exert a return force during a brake release. A joining element is provided between the spreading members, which utilizes a spring and the friction connection between the joining element and one of the spreading members to exert a return force independently of the return force exerted by the sealing gaskets, to thereby assure a sufficient brake release stroke.

Abstract: In a brake actuator device, wear of brake lining, which results in the increase of stroke of the brake actuator device consisting of piston and cylinder, is compensated by an adjuster which functions automatically when the brake is operated. The adjusting process takes place continuously and preferably at the onset of the actuation of the brake. A slip clutch turns the adjuster member which is connected by screw threads to the brake actuator piston to take up slack in the piston stroke. The slip clutch is driven by a rotary member that is in turn operated in response to actuation of the brake actuator.

Abstract: A disc brake having a piston retraction assembly includes a caliper (12) receiving a piston (14) for biasing a friction pad (16) into engagement with a rotor (18). A recess (30) on the caliper receives the retraction assembly 32 and a boot assembly 34 cooperates with the retraction assembly (32) to limit movement of the latter with the piston (14). A resilient member (40) engages the boot assembly (34) to bias the piston (14) via friction ring (36) to return to its rest position.