Title: Fail-safe disc brake with a clearance-takeup mechanism

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Abstract: A disc brake comprising: a caliper housing having axially aligned first and second cylinder bores; a first piston slidable within the first bore and bearing against one of the friction pads; a second piston slidable within the second bore and having an internally threaded tubular piston rod projecting into the first bore; a threaded clearance-takeup member screwed into the piston rod and having a head abutting against the bottom of the first piston; springs acting against one side of the second piston in the direction to apply the brakes; a hydraulic fluid connection for applying pressure fluid to the other side of the second piston so as to release the brake and compress the spring; and a torsion spring having one end connected through a housing to the second piston, and its other end connected to a tubular sleeve that is nonrotatably connected to the clearance-takeup member. The torsion spring exerts a torque on the clearance-takeup member, causing the latter to turn in the direction to extend from the piston rod until all clearance between the head and the bottom of the first piston has been taken up. A friction ring encircles the first piston, and a retracting spring acting against one side of the ring causes the latter to retract the first piston a predetermined minimum distance when the second piston is retracted. If any clearance opens up between the head of the clearance-takeup member and the first piston, such clearance is immediately taken up by the torsion spring turning the member in the direction to extend the same.


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