Abstract: A drum brake operating device effectively eliminated the possibility of damaging a brake cable has efficient logistics, and excellent performance in engaging and disengaging the brake cable.

Abstract: An eddy current braking apparatus is disclosed. The apparatus includes a stator, a coil of wire, and a drum. The stator has a plurality of poles and is mountable to a frame of a vehicle. The coil of wire is wound about each of the plurality of poles and wherein adjacent coils are electrically connected to form an electromagnet. The drum is adapted to receive a wheel and tire assembly and wherein the drum is rotatably mounted to a vehicle axle, and wherein an eddy current is developed between the drum and the stator, from the relative motion of the drum with respect to the stator, thereby retarding rotation of the drum and wheel and tire assembly.

Abstract: A drum brake device having a brake lever with sufficient rigidity, and securing a larger space at a central region of a brake, to provide a large effective brake lever stroke. A by-pass hole 60d, which is freely penetrated by a shoe-hold pin 41 which swingably rises from the back plate is formed in the brake lever 60 positioned beneath the shoe web 20b of the brake shoe 20, and a section of the brake lever 60, surrounding the by-pass hole 60d, is formed in a hollow cavity 60e by drawing or in a groove 60f by bending to be positioned closer to and facing toward the back plate 10.

Abstract: A brake structure that prevents damaging the shoe-hold mechanism by way of securing a larger space at a central region of the brake and achieves a long effective and stable brake function. A by-pass hole 60d, through which the shoe-hold pin 41 is freely penetrating, is formed in the brake lever 60 positioned beneath the shoe web 20b of the brake shoe 20, and the stopper portion 60e contacting the shoe rim 20a is formed on the brake lever 60 so as to avoid the collision between the shoe-hold pin 41 and the by-pass hole 60d when the brake lever 60 is in operation.

Abstract: A brake assembly utilizes a conical brake drum and matching conical brake lining assembly to provide a more efficient braking system. An adjuster mechanism with a pair of conical adjuster members is controlled by an electric motor and worm gear drive. As the lining wears, the adjuster mechanism pulls the conical adjuster members towards one another to force the brake linings outwardly to maintain a predetermined distance between the drum and the brake lining assembly.

Abstract: A dual-mode drum brake assembly including: (a) a backing plate which is fixed to a vehicle body; (b) first and second arcuate brake shoes disposed on the backing plate; (c) an actuator for moving the two brake shoes away from each other to force the two brake shoes against a brake drum so that the brake assembly acts as a leading/trailing drum brake; (d) an intermediate lever pivotably connected to a web of the first arcuate brake shoe; (e) a second strut associated with the intermediate lever and the second arcuate brake shoe; (f) a positioning spring for positioning the intermediate lever and the second strut in respective positions for their engagement with each other; (g) a first strut engaged with one of the second arcuate brake shoe and the intermediate lever; (h) a parking lever which is engaged with the other of the second arcuate brake shoe and the intermediate lever, and which is operable to be pivoted to be engaged with the first strut whereby the two brake shoes are moved away from each other by a

Abstract: A brake cable mounting structure for a drum brake has sufficient support to withstand the reaction force during the brake operation, a function to prevent damage to an inner cable and to prevent water ingress into the brake, a simple structure with less number of parts, and a low-cost advantage. Tubular members 10a, 10b are integrally formed on a back plate 10 by pressing, and a casing cap 22a of an outer casing 22 constituting a brake cable 20 is attached in the tubular members 10a, 10b.

Abstract: The present invention to provides a drum brake that generates the same braking force when a vehicle moves forward and backward. A first lever is connected to a second lever by a strut. A fourth lever provided with an anchor member and a third lever for connecting the fourth lever and the first lever to the end of the fourth lever) opposite to the anchor member across a screw which is the center of swing of the fourth lever. Accordingly, when the vehicle moves forward, an anchor load is received by the anchor member and the second lever. When the vehicle moves backward, the anchor load is received by the anchor member and the first lever.

Abstract: A brake structure that prevents damaging the shoe-hold mechanism by way of securing a larger space at a central region of the brake and achieves a long effective and stable brake function. A by-pass hole 60d, through which the shoe-hold pin 41 is freely penetrating, is formed in the brake lever 60 positioned beneath the shoe web 20b of the brake shoe 20, and the stopper portion 60e contacting the shoe rim 20a is formed on the brake lever 60 so as to avoid the collision between the shoe-hold pin 41 and the by-pass hole 60d when the brake lever 60 is in operation.

Abstract: A drum brake device having a brake lever with sufficient rigidity, and securing a larger space at a central region of a brake, to provide a large effective brake lever stroke. A by-pass hole 60d, which is freely penetrated by a shoe-hold pin 41 which swingably rises from the back plate is formed in the brake lever 60 positioned beneath the shoe web 20b of the brake shoe 20, and a section of the brake lever 60, surrounding the by-pass hole 60d, is formed in a hollow cavity 60e by drawing or in a groove 60f by bending to be positioned closer to and facing toward the back plate 10.

Abstract: A parking brake for vehicles, which guarantees safe parking from the very first time it is actuated, comprises a drum and at least one shoe intended to press against a cylindrical surface formed on the inside of the drum, recesses and projections being provided on said surface.

Abstract: In a drum brake, a damper spring is provided for transmitting a shoe operating force outputted from a power lever to an input lever and for absorbing an impact force transmitted from brake shoes to the power lever via a link mechanism. The damper spring is mounted between the power lever driven by an electric motor of an operating force producing mechanism and the input lever of the link mechanism for receiving the shoe operating force outputted from the power lever for driving the shoes.

Abstract: A brake cable mounting structure for a drum brake, in which even if the distance from the brake mounting surface to the center of the brake shoes in the width direction is short, the layout of the brake cable mounting section and the mechanical expander is efficient and effectively provided. Further, the anchor only need to support the braking force, thereby making the device smaller and lighter. The brake cable mounting structure of this invention is characterized in that the inner cable of the brake cable extends out from the brake; and the guide pipe on which the outer casing of the brake cable is integrally fixed with the back plate.

Abstract: A brake cable mounting structure for a drum brake which, even if the distance from the brake mounting surface to the brake shoe center in the width direction is short, secures an effective stroke of the brake cable, facilitates the layout of the brake cable mounting section and the crank mechanism, and reducing the size of the anchor by only needing to support the brake force. To that end, a brake cable mounting structure for a drum brake is provided, wherein the pipe-like section, in which the outer casing of the brake cable is attached, is formed integrally with the spacer positioned between a part of the back plate around the anchor which supports one adjacent ends of the pair of brake shoes and the brake mounting member.

Abstract: An improved method for final balancing a brake drum determines the location and length of a first constant depth cut and a second constant depth cut along the squealer band which are necessary to correct the imbalance, and using a cutting machine, makes the first and second constant depth cuts at the predetermined location and for the predetermined length along the squealer band to produce a final balanced brake drum. Preferably, the cutting machine is a milling machine which produces a plunge type entrance/exit cut. It is a further feature of the invention to provide a feather type entrance/exit cut to reduce the stress concentrations, and produce a cosmetically more appealing final balanced brake drum.

Abstract: A hold down spring for yieldably securing a drum brake shoe to a drum brake backing plate includes a nail that extends through apertures in the backing plate and in the brake shoe. A coil spring circumscribes the nail and urges a spring retainer slidable on the nail away from the brake shoe. The nail extends through an elongated slot in the retainer, which includes a wider portion which accepts an expanded end of the nail and a narrower portion which is narrower than the expanded end but wide enough to permit the nail to freely slide along the slot. The slot is inclined toward the brake shoe, so that the action of the spring tends to force the nail within the slot toward a seating area at one end of the slot.

Abstract: A drum brake device which reduces the amount of non-effective stroke (play) and prevents noise for the long period of time. The first strut 12 of an automatic shoe clearance adjustment device is provided adjacent to the service brake actuator 8 and between both brake shoes 2 and 3. The parking brake actuator 19 is provided adjacent to the anchor block 9. The central region of the pivot lever 11 is rotatably supported with the central region of one brake shoe 2 as the fulcrum. Both ends of the pivot lever 11 functionally engage with the first strut 12 and the second strut 22 of the parking brake actuator 19 which comprises an automatic stroke adjustment device automatically adjust the stroke. When the brake shoes are opened by the service brake operation, one end 11c of the pivot lever 11 is elastically supported by the first strut 12 of the automatic shoe clearance adjustment device, and the spring applies spring force so that both pivot lever 11 and first strut 12 operate together with one brake shoe 2.

Abstract: A drum brake includes a brake drum attached to an axle, and a brake panel. The brake drum includes a disc portion and a cylindrical portion extending from an outer peripheral end portion of the disc portion towards the brake panel. On an outer peripheral end portion of the cylindrical portion, there is mounted a seal member. The brake panel includes an annular flat surface portion, and a cylindrical projecting portion projecting from an outer peripheral end portion of the annular flat surface portion towards the brake drum so as to surround the seal member. The seal member has plural resilient axial sealing lips and at least one resilient radial sealing lip. The axial sealing lips are in sealing contact with the annular flat surface portion, and the radial lip is in sealing contact with an inner peripheral surface of the cylindrical projecting portion.

Abstract: An object of this invention is to improve brake efficiency, to prevent wear down and deformation of the pivot section between the brake shoe and the pivot lever, and to improve the operator's comfort level during braking. For those purposes, this invention is to provide a drum brake device, wherein a supporting device for supporting the adjacent ends of the pivot levers is such that the pivot levers may easily follow the brake shoe movement in the drum's rotational direction.

Abstract: An improved method for final balancing a brake drum determines the location and length of a first constant depth cut and a second constant depth cut along the squealer band which are necessary to correct the imbalance, and using a cutting machine, makes the first and second constant depth cuts at the predetermined location and for the predetermined length along the squealer band to produce a final balanced brake drum. Preferably, the cutting machine is a milling machine which produces a plunge type entrance/exit cut. It is a further feature of the invention to provide a feather type entrance/exit cut to reduce the stress concentrations, and produce a cosmetically more appealing final balanced brake drum.

Abstract: A rear brake device for a beach buggy includes an axle sleeve, a brake disc fixed at one side of the axle sleeve and having two semicircular brake members, and a brake drum with a center serrated tube to engage and rotate synchronously with the axle. The brake disc and the brake drum are made of aluminum of high strength, and the axle sleeve is fixed at the other side of the brake disc, and the brake drum covers an outer side of the brake members. The axle fits in a cylindrical fix tube to force the brake drum firmly touch the brake disc without falling off and sealing the serrated connect tube, too. A dirt rubber ring is fitted around the joining location of the brake drum and the brake disc. Then the brake disc does not disfigure, and the brake drum can increase its size and functions as a cover so as to increase the friction coefficient to enhance braking effect.

Abstract: A single shoe drum brake device which provides stable braking effect by tending to equalize the braking effect when the vehicle is moving forward and backward without losing self-servo property during moving either forward or backward. Additionally, the device avoids damage to the brake pipe due to objects such as flying gravel, debris, and the like by locating the wheel cylinder in upper portion of the brake device. Further, the structure enables the run of the parking brake cable to be directed entirely toward the front of the vehicle. One of two anchors (10, 14) is positioned so that the distance from a horizontal straight line through the brake center (0) and across the brake shoe (3) to that anchor is shorter than the distance from the line to the other anchor. This one anchor is a pivot shoe anchor and the other anchor is a floating shoe anchor.

Abstract: A composite brake drum for a motor vehicle or the like. The brake drum has a drum body that is comprised of a first material, preferably a cast metal, such as gray iron. The drum body has a cylindrical section, a shoulder, a mounting face, and a balancing skirt. The brake drum also includes an annular band formed from a second material, preferably a stamped metal such as steel. The annular band encircles the cylindrical section of the drum body. The balancing skirt extends from the cylindrical section and along a portion of a radially outer surface of the annular band. The steel annular band is positioned in a mold apparatus and molten iron is introduced into a mold cavity defined thereby. The mold and annular band are maintained in a static condition during the casting process. In a second embodiment, the cylindrical section and the skirt may be formed from the first material. The mounting face, the shoulder, and the annular band may be formed from the second material.

Abstract: A servo friction brake which includes a carrier, and at least one friction lining which is supported on the carrier and interacts with at least one friction surface, and at least one device for actuating the friction lining. In order to considerably reduce the sensitivity of the friction brake to coefficient of friction and to achieve high servo effect values, especially in the range close to the locking limit, a mechanism which permits varying the servo effect during operation of the brake.

Abstract: A band brake for selectively holding a rotating element motionless includes means for evenly distributed application of force to the band brake. In some embodiments of the invention ball or roller bearings are used to apply evenly distributed forces to the band brake. In other embodiments of the invention, the band brake has variable thickness and the thicker portions are wedged between a rotating member and some outer member to hold the rotating member motionless. In at least one embodiment, selectively movable pairs of mirror-image ball or roller bearings are used to apply braking force directly to a rotating element.

Abstract: An improved method for final balancing a brake drum determines the location and length of a first constant depth cut and a second constant depth cut along the squealer band which are necessary to correct the imbalance, and using a cutting machine, makes the first and second constant depth cuts at the predetermined location and for the predetermined length along the squealer band to produce a final balanced brake drum. Preferably, the cutting machine is a milling machine which produces a plunge type entrance/exit cut. It is a further feature of the invention to provide a feather type entrance/exit cut to reduce the stress concentrations, and produce a cosmetically more appealing final balanced brake drum.

Abstract: A drum-in-hat brake assembly (10) having first (12) and second (14) brake shoes retained on a backing plate (16) by first (18) and second (20) pins connected to the backing plate (16). The first (12) and second (14) brake shoes are aligned on the backing plate (16) by an anchor post (40) and connected to a reverse actuator (26). The reverse actuator (26) receives an input force to respectively move first (42) and second (44) friction pads associated with the first (12) and second (14) brake shoes into engagement with a drum (46) to effect a brake application. The reverse actuator (26) includes a first lever (52) and a second lever (54), each of which have a flat plate (60,76) that extends through an opening (62) in the backing plate (16). A resilient member (90) located in the opening (62) maintains the flat plates (60,76) in a same perpendicular plane with respect to the backing plate (16).

Abstract: An inside shoe drum brake, particularly for motor vehicles, is disclosed which comprises a support arrangement for the brake shoes which can be pressed by means of an actuation device against the brake drum, and which has a brake anchor plate carrying the support arrangement and the actuation device as well as comprising an area for the attachment to a wheel carrier. According to the invention, a guide element is provided which is engaged in the axial direction of the brake with the brake shoes and which is guided, in a sliding manner, on the attachment area or on the actuation device. Thus a simply designed and lightweight inside shoe drum brake is provided which has an optimized noise behavior with respect to brake squeal.

Abstract: A drum brake (10) having first (14) and second (16) brake shoes retained on a backing plate (20) and moved into engagement with a drum (18) to effect a brake application corresponding to a desired braking input supplied to a actuator member (28) is disclosed. The actuator member (28) has a housing (50) with a first bore (54) therein connected to a cross-bore (56). A pinion (58) located in the first bore (54) has a shaft with first end (60) and a second end (62). The shaft has teeth (58) thereon adjacent the first end (60) and a gear (64) connected to the second end (62). First (74) and second (76) racks which are located in the cross-bore (56) have teeth (67,67') thereon which mesh with the teeth (68) on the pinion (58). A first linkage member (28) connects the first rack (74) with the first brake shoe (14) while a second linkage member (28') connects the second rack (76) with the second brake shoe (16).

Abstract: A shiftable device which acts as a brake or coupling, such as a frictional brake or a frictional clutch, includes a first component and a second component and a pressure ring arranged between the first and second components, wherein the pressure ring is connected non-rotatably or stationary to the first component, while being movable by an actuating and restoring device between two work positions which are axially offset relative to each other. At least one friction element which is compressed in an active position of the pressure ring is arranged between the pressure ring and the second component. A plurality of radially resilient tongues which each have a fixed tongue end are fastened without play in the area of the first component. A plurality of guide members supported on the pressure ring and connected to the other movable tongue ends serve to convert the axial movement of the pressure ring into a radial movement of the movable tongue ends.

Abstract: A braking system for an automotive vehicle is provided which comprises, in combination, a wheel having a specifically-defined wheel rim for mounting a tire thereon, and a specifically-defined disc carrying the wheel rim for mounting the wheel upon a wheel support of the automotive vehicle. A cylindrical support is secured to the wheel. Radially-inwardly facing arcuate brake lining structures are secured to the cylindrical support. Brake shoes are mounted upon a non-rotatable part of the automotive vehicle in spaced positions around the rotational axis of the wheel support. A pressurized-fluid operating system of a specifically-defined structure is provided for moving the brake shoes in a braking action radially-outwardly from inactive positions towards, and frictionally-engaging, the brake lining structures, and for returning the brake shoes radially-inwardly to the inactive positions upon termination of said braking action.

Abstract: A preassembled spring and cup assembly is used in a brake assembly. The spring and cup assembly includes a cup which is engaged against a spring. The cup has a slot therethrough through which a pin is passed to retain the pin with the cup and to retain the preassembled spring and cup assembly with the brake assembly. The cup further includes at least one indent in which the pin is releasably retained. The assembly further includes structure for retaining the spring in a compressed condition. The retaining structure is capable of being selectively released to allow the spring to expand. In a first embodiment, the retaining structure is an arm portion which is integrally formed with the spring and extends upwardly to the cup to engage the cup through an opening in the cup. The pin is used to release the retaining structure. In a second embodiment, a base stamping is provided which is attached to the second end of the spring. Arm portions extend upwardly from the base stamping to the cup and engage the cup.

Abstract: A drum brake device having a single brake shoe mounted to be movable on top of the back plate. One end of the brake shoe abuts against an anchor (10) and the other end interlocks with a shoe clearance adjustment device (14). A link (11) is supported so as to pivot in the central region of the brake shoe (3). One end of the link (11) is interlocked so as to be activated by a service brake actuator (12) itself activated when the service brake is applied, while the other end of the link (11) abuts against the anchor (10). When the brake drum is rotating in one direction, the other end of the brake shoe (3) is supported by the anchor (10), and when the brake drum is rotating in the reverse direction, the one end of the brake shoe (3) is supported by the shoe clearance adjustment device (14).

Abstract: A vehicle brake assembly where the actuator tube is positioned in a relief portion formed in the periphery of a brake spider and a pair of separated return springs are respectively attached to a pair of brake shoes pivotably mounted to the spider where an actuator mounting flange is positioned against a shoulder formed in the actuator tube. The brake assembly overall size is minimized for use in a reduced diameter wheel while maximizing the travel of the brake shoes using a cam type actuator.

Abstract: Uniformly distributed compressive stresses are induced in the machined surfaces of brake drums and brake rotors. The compressive stresses cancel residual tensile stresses induced in the surfaces by machining operations during fabrication. Cancellation of the surface tensile stresses delays formation of cracks during service brake use and extends the service life of the brake drum or rotor. Shot peening is an applicable prestressing process which also imparts a surface roughness that reduces the time required to burnish brake pads to match the shape of the drum or rotor surface. The reduction of burnishing time reduces the amount of surface cracking caused by surface heating by brake pad high spots as the high spots are ground down.

Abstract: An improved method for final balancing the brake drum determines the location and length of a constant depth cut along the squealer band which is necessary to correct the imbalance, and using a cutting machine, makes the constant depth cut at the predetermined location and for the predetermined length along the squealer band to produce a final balanced brake drum. Preferably, the cutting machine is a milling machine which produces a plunge type entrance/exit cut. It is a further feature of the invention to provide a feather type entrance/exit cut to reduce the stress concentrations, and produce a cosmetically more appealing final balanced brake drum.

Abstract: A brake drum assembly with a cylindrical brake drum having an open end and a flanged end and an axis of rotation where an annular squealer band is formed on the brake drum approximately adjacent to the flanged end. A plurality of fracture apertures are formed in the squealer band and axially extend through the squealer band parallel to the axis of rotation of the brake drum. The fracture apertures are randomly circumferentially spaced along the squealer band and/or randomly angled relative to the axis of rotation. The squealer band is then cracked from the fracture apertures radially outward to the outer surface of the squealer band thereby providing friction dampening as vibration in the brake drum and squealer band cause relative motion within each crack. In an alternative embodiment, fracture apertures are formed in the brake drum adjacent to the open end and oriented radially inward where the brake drum is cracked from each fracture aperture toward the open end.

Abstract: A drum-type brake actuator provides increased force transmission efficiency and assembly simplicity. An anchor carries two pistons which are moved to apply a brake shoe by the cooperative operation of a lever and strut arrangement. The utilization of three pivot joints in a simplified mechanism results in high efficiency output.

Abstract: The drum-in-hat assembly (10) comprises a disc brake (12) mounted slidably relative to a backing plate (18) which includes an opening (19) through which extends a reverse scissors actuator (40) for the drum brake (30) of the assembly (10). The drum brake (30) includes a pair of arcuate drum brake shoes (32, 34) supported relative to the backing plate (18), with the shoes (32, 34) having a pair of opposed brake shoe ends (36, 38) engaged by the actuator (40). The actuator (40) comprises a pair of levers (42, 46) pivotably attached to one another with each lever (42, 46) having a second lever end (48, 58) engaging a respective end (38, 36) of an associated brake shoe, wherein the second lever end (48, 58) has either a slot (49) or an edge (59) located laterally away from the other and engaging the associated brake shoe end (38, 36). The actuator (40) is free to float relative to the backing plate (18), and the levers (42, 46) are located within a housing (70) attached to the backing plate (18).

Abstract: The device for braking an electric drive motor of a hand-held working tool has a safety brake for an immediate stopping of the working tool and an independent mechanical brake for coasting the working tool to a stop after switching off the drive motor. The mechanical brake acts on a rotational part connected to the drive motor and is activated when a switch element for activating the drive motor is released.

Abstract: A centrifugal resistance device for stationary exercise apparatus that is operatively associated with a rotatable shaft; the centrifugal resistance device comprises a slotted ring, braking material and a fixed cover means; the slots of the slotted ring house friction material that is free to move radially and act frictionally against the fixed cover means positioned about the slotted ring, the fixed cover means is fashioned by those skilled in the art as to act also as a heat dissipating means; tension is varied by increasing or decreasing the RPMs of the rotatable axle.

Abstract: A thermal insulating wheel spacer for placement between a vehicle brake drum and a wheel, where the spacer has a plurality of mounting holes formed within a plurality of mounting pads with scallop portions adjacent to each mounting pad. The wheel spacer is assembled in layers of materials having enhanced wear and thermal insulating properties.

Abstract: A cylindrical brake drum including a flanged end and an open end having a radially extending annular extension ring acting as a squealer band and a multiplicity of chill fins irregularly spaced one to another and/or relative to a plurality of equally spaced airflow channels where the chill fins are cast as part of the extension ring and the outside surface of the brake drum where the chill fins are of a substantially constant height relative to the brake drum and act to reduce the size and number of any casting porosities and further move the porosities away from the friction surface of the brake drum thereby improving fatigue strength. A multiplicity of cooling fins are formed on the inboard side of the extension ring. In an alternative embodiment, the extension ring can be formed as a wing which axially extends from the brake drum having a multiplicity of chill fins formed on its outer surface.

Abstract: An automotive drum brake assembly includes first and second brake shoes mounted on a backing plate. A wheel cylinder for braking actuation is mounted between the brake shoes. An adjuster screw assembly is held between the brake shoes by an adjuster spring. The adjuster screw assembly includes a pivot nut threaded onto an adjuster screw. In one embodiment, a sleeve includes a first portion slidably mounted on the pivot nut, a second ramp portion covering the screw threads and a third portion opposite the pivot nut. The second portion, preferably formed as a frustoconical ramp, is slid by the adjuster spring to travel with the adjuster screw as it unthreads from the pivot nut, thereby shielding threads from corrosive elements.

Abstract: A new and improved brake shoe hold down mechanism for retaining a brake shoe to an inside surface of a backing plate includes a nail having a head disposed on an outside surface of the backing plate limiting axial travel of the nail and a barb-like tip adapted to pass through apertures in the backing plate and a web of the brake shoe. A wire spring is disposed on a first end against the brake shoe and has a coil on a second aligned with the tip of the nail. A cup shaped retainer cap is compressively seated against the spring coil and engaged by the tip of the nail at a bottom of the cap thereby biasing the brake shoe against the backing plate. The retainer cap has a slot from a first position at which the nail tip is received and which is offset from the bottom of the cap to a second position at a bottom of the cap to which the tip is biased by the compressive spring load. The tip engages the bottom of the cap independent of orientation to the slot.

Abstract: An apparatus to effect the engagement of brake shoes relative to a trailer axle of an associated trailer includes rotating rod members directed from a central housing, wherein the rod members are arranged to project rotatably through the brake backing plate of respective wheel members to effect actuation of a cam structure to effect engagement of the brake shoes of an associated wheel, with a brake drum arrangement.

Abstract: A ratchet wheel having a locking device, includes a housing, a ratchet wheel disposed pivotally in the housing in such a manner that one end of its axle couples with an external rotating object, a braking member having a shank provided at one end thereof with a wedge angle and at other end thereof with a pivot, and a lock. The pivot is coupled pivotally with the housing in such a way that it moves between a first position and a second position. When the braking member is at the first position, its wedge angle meshes with ratchet wheel. When the braking member is at the second position, its wedge angle disengages from the ratchet wheel. The lock has a lock core capable of moving between a locking position and an unlocking position. The locking position of the lock core corresponds to the first position of the braking member, while the unlocking position of the lock core corresponds to the second position of the braking member.

Abstract: A seal arrangement is disclosed for an actuating device of a drum brake furnished with an actuating lever which projects through the brake carrier. This arrangement includes an oval pleated bellows (1) fastened by a clamping ring (14) having teeth (15) arranged on its external edge (30) pressed into the wall of a matching, generally elliptical recess. Preferably, the pleated bellows is of asymmetrical configuration and is in a largely unloaded condition in the actuating position of the actuating lever.

Abstract: A flat lever (314) for use in a blind-cable-connection parking brake system is formed by stamping from sheet steel stock. At one end, the lever is adapted for pivotal connection with a backing plate, and at its other end, the lever is stamped to defined opposed spaced inclined ramp (314a) and helical guide spring support (314b) portions integral with the lever. In order to properly orient the guide spring relative to the ramp, the guide spring support includes a support ledge (314d) for supporting one end of the spring (320) relative to a spring-receiving opening formed in the guide spring support portion.

Abstract: A drum brake includes a pair of brake shoes which are provided such that when expanded, they are forced against a brake drum to generate a braking force, a strut which is received in notches formed in the respective webs of the brake shoes so as to extend therebetween, a parking lever which is rotatably supported on either one of the brake shoes such that when rotated, it engages the strut to expand the brake shoes, and a coil spring which is loaded between the strut and the notch formed in the web of the other brake shoe to bias the strut toward the first brake shoe. The notch in the web that is engaged with the strut includes a first notch portion that is formed by cutting the outer peripheral portion of the web and a second notch portion that is formed by further cutting the web at the bottom of the first notch portion at the approximately central portion thereof in the direction of the width of the notch.