Title: Automatic slack adjuster for vehicle brakes

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Abstract: A slack adjuster for a cam-actuated vehicle brake that automatically compensates for lining wear of the brake, wherein the adjuster is capable of differentiating between that portion of the actuating piston stroke required to take up the running clearance between the brake shoes and brake drum from the non-braking to the braking position and that portion of the piston stroke occurring because of the lining wear of the brake shoes. The slack adjuster utilizes a lever rotated by an actuating piston and housing a worm gear on a cam shaft for the brake actuating cam, a worm shaft having a worm engaging the worm gear, an actuator or driving member positioned on and rotatable relative to the worm shaft, a one-way spring clutch encompassing the actuator and worm shaft, a friction device to prevent unintentional turning of the worm shaft, and a linkage between the actuating piston and the actuator to rotate the actuator and the worm through the one-way clutch, thereby adjusting the brake during the braking or brake releasing stroke only where there is a greater braking stroke than that required to close the running clearance between the brake shoes and the brake drum.


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