Abstract: A braking system is presented that comprises a brake sphere rotor that is mounted to the wheel hub of an axle. The braking system incorporates a caliper arm assembly that comprises at least one caliper arm. Each caliper arm further comprises hemispherical friction material located between the caliper arm and the brake sphere rotor.

Abstract: A parking brake actuation system mounted to a tail shaft of a vehicle's transmission is operably connected to a brake assembly of the vehicle having brake pads housed within a brake drum. The parking brake actuation system includes a mounting bracket coupled to the tail shaft of the vehicle's transmission, an actuator coupled to the mounting bracket, and a bell crank coupled to the tail shaft of the vehicle's transmission and the actuator, and also connected to an engagement cam by a linkage assembly. Actuation of the actuator to a retracted position permits rotational movement of the bell crank to transfer through the linkage assembly to engage the pair of brake pads with the brake drum. Actuation of the actuator to an extended position permits rotational movement of the bell crank to transfer through the linkage assembly to disengage the pair of brake pads from the brake drum.

Abstract: A gear assembly includes a first gear and a second gear. The first gear rotates about a first axis, and includes a first plurality of teeth and a first surface extending circumferentially and carried by the first plurality of teeth. The first surface is electrically conductive. The second gear rotates about a second axis and is operably connected to the first gear. The second gear includes an electrically conductive element, a second plurality of teeth, and a second surface extending circumferentially and carried by the second plurality of teeth. The second surface is electrically nonconductive. The electrically conductive element includes a plurality of feelers with each feeler projecting radially outward and into a respective tooth of the second plurality of teeth.

Abstract: A vehicle brake slack adjuster includes a housing coupled to a brake actuator and supporting a driving worm wheel engaging the brake cam shaft and a driving worm screw meshed with the driving worm wheel and transferring a brake actuating force, imparted by the brake actuator to the housing, to the driving worm wheel and cam shaft. The adjuster further includes a wear adjustment mechanism including a reference arm fixed against movement and including a control ring gear, a pinion gear meshed with the control ring gear and configured for rotation about an axis, a clutch ring disposed about the axis and configured for rotation with the pinion gear, a control worm screw disposed about the axis, a wrap spring engaging surfaces of the clutch ring and control worm screw and a control worm wheel meshed with the control worm screw and configured for rotation with the driving worm screw.

Abstract: A slack adjuster is provided for a drum brake of a vehicle air braking system. The slack adjuster comprises a gear set including (i) a worm wheel having an outer circumferential surface, and (ii) a worm shaft having a longitudinal central axis and meshed with the worm wheel. The worm shaft is rotated in one direction about its longitudinal central axis when the drum brake is applied and adjustment is required and in an opposite direction about its longitudinal central axis when the drum brake is released. The slack adjuster further comprises an anti-reversing member having an inner circumferential surface facing the outer circumferential surface of the worm wheel. The anti-reversing member allows rotation of the worm wheel when the drum brake is applied and prevents rotation of the worm wheel when the drum brake is released.

Abstract: A pan tilt drive device includes a board, a drive worm that is rotatably supported by the board, a terminal worm wheel that is rotatably disposed relative to the board, a holder plate that is parallel to the board, a shaft that is rotatably supported while being parallel to the holder plate, an intermediate worm wheel that is fixed to one end of the shaft, and that meshes with the drive worm, an intermediate worm that is fixed to the other end of the shaft, and that meshes with the terminal worm wheel, a pivot mechanism, and a biasing member that biases the holder plate toward the drive worm and the terminal worm wheel.

Abstract: A brake lever for a drum brake of a vehicle including a lever section for connection with a brake cylinder and a housing section for attachment to a splined S-cam shaft, which receives an adjustment device, the adjustment device including a first clutch (K1), the first clutch (K1) being biased by a first spring element with a spring force and a second clutch (K2) formed as an one-way clutch with a number of teeth (Z2), the second clutch (K2) being biased by a second spring element with a spring force, in which the teeth (Z2) of the second clutch (K2) are configured such that the spring force applied by the second spring element can shift the second clutch (K2) in its completely closed position against the torques which are induced in it by friction, as long as the first clutch (K1) remains in an open position.

Abstract: An improved self-adjusting automatic slack adjuster for reducing slack in the brake of a vehicle is provided, in which an easily accessible external operating feature permits the automatic slack adjuster's one-way clutch assembly to be readily disengaged to allow smooth release and retraction of the brake shoes of a vehicle brake without damage to the one-way teeth of the clutch assembly. When the external feature is operated in a brake release direction, the motion of the feature is translated into a motion which axially displaces an output part of the one-way clutch away from an input part of the clutch a distance sufficient to disengage the parts' one-way teeth, thereby disengaging the one-way clutch to permit brake shoe retraction without resistance from the one-way clutch.

Abstract: An air brake monitoring system which provides a warning signal, either visual or audible, to truckers informing them when their brake system needs corrective attention. More particularly, the system of the present invention permits the brake monitoring system to be easily adjusted to account for the needs and desires of the individual vehicle operator.

Abstract: A lining wear adjustment device for a disc brake with a brake application device having a brake actuating lever, which can preferably be inserted into an adjustment spindle of the disc brake, includes an adjusting shaft with an external bearing, a rotary drive element and a clutch device for switchable coupling of the rotary drive element to the adjusting shaft. The clutch device is an electrically controllable solenoid clutch with at least one electromagnetic coil.

Abstract: To provide the mechanical brake actuator enabling to downsize the device and to reduce the manufacturing costs of the parts. The mechanical brake actuator comprises the strut (23) which engages with one brake shoe (12) and has two facing plates (23b) with a strut-bridge (23a) connecting therebetween and the plate-like brake lever (24) which engages with the other brake shoe (13). The brake lever (24) is retained in the space (23c) between the facing strut plates and is pivotally supported on the strut (23), and the inner cable (41) of the brake cable (40) connected to the free end (24e) of the brake lever (24) via the connecting pin (43). The mechanical brake actuator which is operated by pulling the inner cable (41) comprises the clip (70), which rotatably attaches to the strut-bridge (23a) and restricts the rotation of the brake lever (24) in the cable releasing direction.

Abstract: A brake lever for a drum brake of a vehicle including a lever section for connection with a brake cylinder and a housing section for attachment to a splined S-cam shaft, which receives an adjustment device, the adjustment device including a first clutch (K1), the first clutch (K1) being biased by a first spring element with a spring force and a second clutch (K2) formed as an one-way clutch with a number of teeth (Z2), the second clutch (K2) being biased by a second spring element with a spring force, in which the teeth (Z2) of the second clutch (K2) are configured such that the spring force applied by the second spring element can shift the second clutch (K2) in its completely closed position against the torques which are induced in it by friction, as long as the first clutch (K1) remains in an open position.

Abstract: An improved self-adjusting automatic slack adjuster for reducing slack in the brake of a vehicle is provided, in which an easily accessible external operating feature permits the automatic slack adjuster's one-way clutch assembly to be readily disengaged to allow smooth release and retraction of the brake shoes of a vehicle brake without damage to the one-way teeth of the clutch assembly. When the external feature is operated in a brake release direction, the motion of the feature is translated into a motion which axially displaces an output part of the one-way clutch away from an input part of the clutch a distance sufficient to disengage the parts' one-way teeth, thereby disengaging the one-way clutch to permit brake shoe retraction without resistance from the one-way clutch.

Abstract: An improved automatic slack adjuster for reducing slack in the brake of a vehicle, in which a one-way clutch assembly is arranged at a side of the automatic slack adjuster housing, and one-way motion-inhibiting pawls in the one-way clutch assembly act on one-way gear teeth disposed on an inner radius of a gear wheel within the assembly whose outer circumference drives a slack adjuster unit. The incorporation of the one-way clutch within the anchor unit of the adjuster provides an automatic slack adjuster which can be produced at a reduced cost, manufactured more easily, and provides for improved adjustment performance with much reduced dependence on the lubricity of grease used.

Abstract: An improved self-adjusting automatic slack adjuster for reducing slack in the brake of a vehicle, in which a one-way clutch assembly is arranged in the housing of the automatic slack adjuster housing such that a thin-wall region of the housing associated with the gear drive of the one-way clutch assembly is located outside of a load path through which brake applications forces are conveyed from a brake actuator to a brake cam shaft upon which the automatic slack adjuster is located. The new positioning of the one-way clutch assembly drive results in unexpectedly lower stress levels in the automatic slack adjuster, resulting a more durable slack adjuster and permitting surprisingly large increases in slack adjuster capacity rating.

Abstract: This invention relates to an improvement on Automatic Brake Adjuster with flexible reference point wherein one-way lock mechanism and clutch mechanism are integrated in one part and located on the worm shaft with the provision of isolating the one way lock mechanism and regulator worm gear wheel from heavy clutch spring load by a thrust sleeve arrangement for independent function. one-way lock mechanism is meant for sensing the excess lining clearance and adjusting the slack between the brake lining and brake drum whereas the clutch mechanism is to ignore the excess stroke of brake actuator due to elasticity in the foundation brake parts of a vehicular braking system.

Abstract: This invention is to provide an automatic slack adjuster for automobile, belongs to technical domain of automobile mechanisms. The problem of lower safety, poor in universality and higher cost appeared in existing brake system of automobile has been solved by this invention.

Abstract: A cable operated drum brake has an internal brake operating lever with a quick-attach device for an operating cable. A cable attachment tube projects from a backplate of the brake and the operating cable has an inner cable with a latching formation on the end thereof and a cable outer sleeve. An end portion of the operating cable is slideable towards the backplate within the tube up to a first position at which further movement towards the backplate is stopped by contact between an abutment on the tube and a cooperating abutment on the cable outer sleeve. When the latching formation has moved past the quick-attach device, the cable is then subsequently moveable away from the backplate within the tube to a second position in which the latching formation is fully engaged with the quick-attach device. A fastener maintains the latching formation engaged with the quick-attach device during subsequent operation.

Abstract: To provide the drum brake with the automatic shoe clearance adjustment apparatus to reduce the cost of the drum brake as reducing the number of components. The first engagement portion is provided between the brake lever and the strut body to engage the brake lever and the strut body without operating the service brake, and the second engagement portion is provided also to engage the brake lever and the strut body while automatically adjusting the shoe clearance.

Abstract: A linkage positioner for a drum brake for adjusting braking-related wear, especially on brake linings, has an overload clutch and a one-directionally rotating or one-way clutch, including a ball ramp clutch, which is biased with the aid of a pressure spring, and a bevel clutch.

Abstract: An automatic brake adjuster which is capable of sensing an excess wear of the brake lining and which is automatically calibrated to maintain an optimum clearance is disclosed. The brake adjuster has a body, a one-way loc/clutch seat firstly with a rotatable worm shaft that forms a clutch mechanism with mutually engageable serrations, and secondly with one-way lock sleeve that forms a one-way lock mechanism to incorporate an integrated one-way clutch mechanism over the worm shaft.

Abstract: An improved self-adjusting automatic slack adjuster for reducing slack in the brake of a vehicle is provided, in which an easily accessible external operating feature actuates a ball detent clutch to permit the automatic slack adjuster's adjustment mechanism to be readily disengaged, so as to allow smooth release and retraction of the brake linings of a vehicle brake without damage to the adjustment mechanism's components. When the torque applied to the external feature exceeds a predetermined torque, the balls of the ball detent clutch move out of their retaining detents, thereby disengaging the slack adjuster's worm shaft from the adjustment mechanism and permitting brake shoe retraction without resistance from the adjustment mechanism.

Abstract: An improved self-adjusting automatic slack adjuster for reducing slack in the brake of a vehicle is provided, in which an easily accessible external operating feature permits the automatic slack adjuster's one-way clutch assembly to be readily disengaged to allow smooth release and retraction of the brake shoes of a vehicle brake without damage to the one-way teeth of the clutch assembly. When the external feature is operated in a brake release direction, the motion of the feature is translated into a motion which axially displaces an output part of the one-way clutch away from an input part of the clutch a distance sufficient to disengage the parts' one-way teeth, thereby disengaging the one-way clutch to permit brake shoe retraction without resistance from the one-way clutch.

Abstract: An improved self-adjusting automatic slack adjuster for reducing slack in the brake of a vehicle, in which a one-way clutch assembly is arranged in the housing of the automatic slack adjuster housing such that a thin-wall region of the housing associated with the gear drive of the one-way clutch assembly is located outside of a load path through which brake applications forces are conveyed from a brake actuator to a brake cam shaft upon which the automatic slack adjuster is located. The new positioning of the one-way clutch assembly drive results in unexpectedly lower stress levels in the automatic slack adjuster, resulting a more durable slack adjuster and permitting surprisingly large increases in slack adjuster capacity rating.

Abstract: A slack adjuster for a vehicle drum brake includes a pinion that rotates about a worm axis whenever the slack adjuster pivots. Excess clearance is taken up upon commencement of the apply stroke, at an accelerated rate. This enables a larger amount of initial clearance to be built into the brake.

Abstract: A linkage positioner for a drum brake, which is used to compensate for braking-related wear, especially on the brake linings, has an overload clutch and a one-directionally rotating or one-way clutch. The overload clutch is embodied as a ball ramp clutch, which is biased by a pressure spring.

Abstract: An actuator for a drum brake including a plunger connected through a resilient member to a linkage attached to a web on a brake shoe. A rod extends from the plunger and engages a lever arm that is pivotally retained on the web. The lever engages an extendable strut of an adjuster arrangement through which a running clearance is maintained between the brake shoe and a drum. During a brake application, pressurization fluid acts on the plunger to develop an operational force that is communicated through the resilient member to move the brake shoe into engagement with a drum. Should the operational force overcome the resilient member, the plunger moves toward the linkage and a reactive force is applied through the rod that acts through the lever arm to prevent a pawl from rotating such that a current length of the strut and correspondingly a current running clearance is sustained.

Abstract: A linkage positioner for a drum brake, which is used to compensate for braking-related wear, especially on the brake linings, has an overload clutch and a one-directionally rotating or one-way clutch. The overload clutch is embodied as a ball ramp clutch, which is biased by a pressure spring.

Abstract: A linkage positioner for a drum brake for adjusting braking-related wear, especially on brake linings, has an overload clutch and a one-directionally rotating or one-way clutch, including a ball ramp clutch, which is biased with the aid of a pressure spring, and a bevel clutch.

Abstract: A brake actuator redirects pressurized air that compressed a parking brake spring to the other side of a piston upon release of the parking brake spring. The redirected air is clean air which removes contaminates and pushes them out a one-way check exhaust. A first embodiment of the brake actuator uses an external quick release valve to take exhaust air from a pressure chamber and direct it to the spring chamber. A second embodiment of the brake actuator uses the spring brake control valve to take exhaust air from the pressure chamber and direct it to the spring chamber. In each embodiment, the pressurized air pushes out the excess air past the one-way check exhaust, carrying all contaminates with it. The brake actuator can also advantageously be operated under water without the water entering the spring chamber.

Abstract: A lever for moving first and second brake shoes into engagement with a drum to effect a brake application. The lever has a first end connected to the brake shoes and a second end with a tine fixed thereto to which a cable is connected to apply an input force to effect a brake application. A predetermined force is applied to the tine to deflect the tine and a tab engages the lever to hold the tine in the deflected position. The tine and second end of the lever move in unison in response to an input force until the input force exceeds the predetermined force such that while the tine and cable continue to move in unison the deflection of the tine proportionally reduces the movement of the first end of the lever and as a result an actuation force applied to effect a brake application is correspondingly reduced.

Abstract: The invention pertains to the fluid powered brake systems of vehicles using brake drum and lined brake shoes internally expanded by cam. The invented device automatically adjusts the slack, which develops due to the wearing of brake liners and the drum. When the angular movement of the Lever Housing (1) exceeds the desired limit due to the wear, the internal device adjusts the excess clearance of slack automatically. The parts consist of a Worm Wheel (3); an enmeshing Worm Shaft (4); a Paul (6); a Leaf Spring (1); a Ratchet cylinder (5); an Acuator Rod (7); a Guide (9); an End Connector (8); a Clevis (2); and Clevis Pins (2A) and 2(B). When brakes are applied, the Actuator Rod (7) gets pulled out and engages the Paul (6) with the Ratchet cylinder (5). On the return stroke the Paul (6) rotates the worm shaft (4) which in turn rotates the worm wheel (3) and the attached cam thereby removing the slack.

Abstract: A parking brake assembly which includes a lever (15) for operation of a brake shoe (11, 12) to provide a parking function, the lever carrying an automatic latching device for automatically latching to the lever an end fitting (20) on an operating cable (19) and a guide spring (25) extending from an associated brake backplate (13) into contact with the lever. The automatic latching device is in the form of a latching member (22) mounted on the lever which is deflected aside by the end fitting as the cable is fed in a first direction towards the lever within the guide spring and which latches behind an abutment (20a) on the end fitting to latch the cable to the lever so that subsequent movement of the cable in a second direction opposite to the first direction moves the lever to operate the parking function.

Abstract: A brake slack adjuster is provided that includes a housing having an opening with a gear arranged within the opening. The housing includes a bore adjacent to the opening. A worm gear has an axis disposed within the bore and is an engagement with the gear. The worm gear has an end portion with helical teeth. An actuator loosely is arranged within the bore and includes an inner surface with complementary helical teeth engaging the helical teeth of the worm gear. An actuator rod includes an end arranged within the actuator aperture. The rod end is captured in the actuator by a retainer. A pawl assembly is supported by the housing and coacts with the actuator for retaining the actuator in a rotational position relative to the axis. Biasing members are arranged between the actuator and housing bore to urge the actuator engagement with the worm gear end portion.

Abstract: In order to facilitate assembly and disassembly of a vehicle, the invention provides a method of assembling and disassembly a drum brake (1). In this assembly and disassembly method, the operating spacing of two brake shoes (4 and 5) inside a drum brake (3) is pre-adjusted. The invention makes it possible for the drum brake (1) to be delivered with the brake shoes (4 and 5) in a position where they are clamped against each other, corresponding to assembly clearance, while potentially retaining the spacing needed to match the operating clearance of the drum brake. A single action (A, B) on the hand-brake lever (6) enables the shoes to be moved from assembly clearance to operating clearance.

Abstract: This invention relates to an improved park brake cable end assembly for a drum-in-hat disc brake assembly having a disc service brake and a drum-in-hat parking and emergency brake. The drum-in-hat disc brake assembly includes a backing plate adapted to support a drum brake shoe assembly of the drum-in-hat parking and emergency brake; a caliper bracket adapted support a disc brake caliper assembly of the disc service brake; and a drum-in-hat adapter adapted support a disc brake caliper assembly of the disc service brake. According to a feature of the present invention, the drum-in-hat parking and emergency brake includes a park brake cable end assembly including a lever pivotally supported on a link having an end having a configuration which is adapted to accommodate either a parking brake cable having a S-shaped cable end or a clevis shaped cable end.

Abstract: In a drum brake device having a shoe drive cam, the braking force of which is mechanically controlled according to a reaction force acting on an anchor pin by a brake shoe, the cam plate 76 pivotally supported by the anchor pin 10 and the lever plate 30, to which a shoe operating force is given by the operating force generating means 6, are connected to each other being capable of rotating relatively via a pair of cam pins 21, 23 coming into contact with the brake shoes 3, 4, and the transmitting mechanism of the input system composed of the lever plate 30 and the pair of cam pins 21, 23 and the transmitting mechanism of the control system composed of the pair of cam pins 21, 23 and the cam plate 76 are put into a separate state in which a direct power transmission is not conducted between them.

Abstract: A slack adjuster for a vehicle brake includes a slack adjuster body having a cylindrical inner surface at least partially defining a chamber in the body. A worm gear is received in the chamber in the body. At least one low friction ring is interposed between the worm gear and the body and supports the worm gear for rotation in the chamber in the body. A method of remanufacturing a slack adjuster includes the steps of removing a worm gear and at least one low friction ring from a body of the slack adjuster; setting aside the removed low friction ring; and putting the worm gear and at least one new low friction ring into the body.

Abstract: A braking device for a four-wheel buggy including rear swing arms which are attached to a vehicle body frame such that the rear swing arms can swing vertically, an axle shaft attached to the ends of the rear swing arms, and wheels disposed one at each end of the axle shaft is disposed above the axle shaft. The braking device is constructed as a mechanical braking device including a brake drum and a brake shoe which apply a braking force to the wheels, a brake cam lever which activates the brake, and a rear brake operating cable used for operating the brake cam lever. The brake cam lever is provided with a projecting portion which is formed integrally with the brake cam lever at a position below a connecting portion with the rear brake operating cable, the projecting portion protecting the lower side of the connecting portion.

Abstract: A slack adjuster for a brake system is provided that includes a housing with a gear disposed in the housing. The gear has outer circumferential teeth. An adjustment assembly is disposed within the housing and includes first and second members adjacent and rotatable relative to one another. The first member has a worm portion engaging the teeth of the gear. The second member includes an end portion, which typically extends through the housing for receiving manual adjustment from a technician using a tool. The technician applies a rotational adjustment input on the end portion for adjusting the position of the gear, which adjusts the length of a brake actuator push rod to within a desired range. A clutch assembly interconnects the first and second members to limit torque transfer from the second member to the first member produced in response to the rotational adjustment input.

Abstract: The invention relates to a drum brake device (10), which is provided as a wheel brake for a motor vehicle. The invention proposes embodying the drum brake device (10) with a brake belt (14), which is disposed inside a brake drum (12) and can flex in the radial direction of the brake drum (12). Thrust exerted on one end (18) of the brake belt (14) with a simultaneous bracing of the other end (20) of the brake belt (14) causes the brake belt (14) to be pressed against the brake drum (12) from the inside and produces a braking moment. The invention has the advantage that a friction force exerted on the brake belt (14) by the brake drum (12) augments the thrust on the end (18) of the brake belt (14) and thus boosts the braking moment. Another advantage is that the brake belt (14) always rests uniformly against the brake drum (12) over its entire circumference, even, for example, when the brake drum (12) expands due to heating.

Abstract: An adjustment arrangement for a non-servo drum brake having a hydraulic actuator that engages a first web of a first brake shoe and a second web of a second brake shoe. The hydraulic actuator on receiving a hydraulic input develops an actuation force for moving the first and second brake shoes from a rest position into engagement with a rotatable member to effect a brake application. An extendible member, that is connected to the first web and the second web, is extendable to define a running clearance in a rest position between the first and second brake shoes and the rotatable member. A lever arm, that is mounted on the first web, engages the extendable member. A resilient member extends between the lever to the second web to urge the first and second webs into engagement with the hydraulic actuator. The lever arm pivots on the first web as the first web moves through the running clearance during a brake application.

Abstract: A parking brake actuating mechanism in which a first lever (11) acts on a first brake shoe web (13) and a second lever (15) pivoted on the first lever (11) acts on a second brake shoe web (17). The first lever (11) includes an actuating cable abutment formation (31′) against which an actuating cable nipple (28) on the free end of a cable (25) is drawn to move the first lever to increase the effective length of the mechanism and hence move the associated brake shoes. The first lever (11) is of hollow form defining a guide passage (29) which directs the free end of the cable from an aperture (24) in the backplate (23) of the associated brake to a location adjacent the abutment formation (31′) to enable the nipple (28) to be engaged with the formation (31′). A portion (11′) of the first lever outside the guide passage (29) may guide the cable from the end of the passage towards the abutment formation (31′).

Abstract: A vehicle brake slack adjuster of the type having a housing pivotally connected to a vehicle brake operator and enclosing a slack adjusting mechanism operably coupled to a vehicle brake operating system and a linkage for operably coupling the vehicle brake operator to the slack adjusting mechanism, characterized in that the linkage includes an outer part having inner and outer ends with the outer end being pivotally coupled to the vehicle brake operator and the inner end mounting a gear rack, an inner part having an outer end mounting a gear rack and an inner end coupled to the slack adjuster mechanism and a rotatable gear engaged with each of the gear racks.

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 lever is to be attached to a splined S-cam shaft of an automotive drum brake and to be connected to a brake cylinder push rod. The lever has a control arrangement for transmitting a control movement from a control disc with a reference point to a clutch wheel of the lever mechanism depending on the angular movement of the brake lever. The control disc is in gear engagement with a pinion, and an adjustment screw coaxial with the pinion is in engagement with the clutch wheel. A cylindrical driver is axially but non-rotatably movable in relation to the pinion coaxial therewith and forms a one-way clutch with a unit including the adjustment screw, which is axially movable a distance corresponding to a desired control distance or A-measure for the brake lever, the one-way clutch being spring-biased into engagement.

Abstract: It is an object of this invention to provide a drum brake device which solves a problem of decreasing the strength of a back plate near an anchor block and reduces potential damage to the parking brake cable. A pivot lever 60 is pivotally mounted on one brake shoe 20. Upper and lower portions of the pivot lever functionally engage with the other brake shoe 30 via struts 81, 70. A parking brake actuator 90 which pivotally supports on the upper strut 81 and activates upon an activation of a parking brake is arranged to be adjacent to a service brake actuator which activates upon an activation of a service brake. Preferably an operational part of the parking brake actuator is projected out from the brake back plate.

Abstract: Apparatus for a lever (6) for controlling a parking brake including brake units and an electrically driven tightening means for applying or releasing a braking force on the said brake units. Characteristic of the invention is that a means is arranged to detect the position of the lever and produce control signals to a first electric motor (12) for generating a brake force corresponding to the position of the lever. The lever can be adjusted manually. Further there is a second electric motor (49) intended to automatically control the lever (6) depending on incoming control signals. In the fully applied position the lever (6) is locked against manual adjustment.