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.

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.

The invention relates to an actuating device for an internal shoe brake, including an automatic adjusting device with an adjusting lever which includes a guide track in the form of a guiding slot with two opposing track surfaces which cooperate with opposing sides of a housing-fixed guide element in order to convert a displacement of the adjusting lever relative to the housing-fixed guide element into pivoting movements of the adjusting lever.

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.

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.

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.

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.

The invention concerns a centrifugal positive blocking brake for shutter drives. The brake includes centrifugal blocks, central spring element, and a drive motor comprising a drive shaft. A turntable is coupled with the drive shaft. The central spring element having a preloaded spring is centrifugally guided in a recess of the turntable. Either side of the spring is connected with a radially movable engaging tab element. Two different radially acting abutments are disposed on the central spring element and are movable towards recess. The engaging tab element has at least one engaging tab pointing radially inwards. The centrifugal block is attached to the engaging tab element. In the de-energized state of the drive motor, the engaging tab elements together with the centrifugal blocks disposed on them engage into detents of a frame-fixed detent disc with at least one engaging tab in a frictionally and positively locking manner. When voltage is applied and the drive motor starts, the engaging tabs disengage, the individual centres of mass of the central spring element, preloaded spring, the engaging tab element, the engaging tab, and two centrifugal block parts are on one symmetry axis. This invention creates a centrifugal positive blocking brake which is small in size and constructively simple and causes locking of the shutter when de-energized.

The present invention relates to an unpowered braking device using centrifugal force. The present invention may comprise: a housing; a brake drum installed inside the housing; a plurality of braking links rotatably installed on a rotating shaft of the housing and connected such that both ends thereof can expand and contract by means of centrifugal force; brake rollers provided on both ends of the braking links, respectively, such that, when the braking links expand, the brake rollers are forced against the inner walls of the brake drums and thereby generate braking force/torque; and an elastic member for providing elastic force such that both ends of the braking links, which have expanded, can contract.

Electric parking brake devices are configured such that a parking lever is driven by an electric actuator. The electric actuator is provided with: an electric motor drivable in a forward/reverse direction and operationally controlled by a motor control unit according to rotational loads; a conversion mechanism capable of converting a rotational motion into a linear motion, moving the parking lever from a return position toward an operating position through forward rotation of the electric motor, and moving the parking lever from the operating position toward the return position through the reverse rotation of the electric motor; and a load applying mechanism (a stopper and a disc spring assembly) for applying a predetermined rotational load to the electric motor by driving a constituent member of the conversion mechanism after the parking lever is moved from the operating position to the return position through the reverse rotation of the electric motor.