Importance

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Abstract

A disk brake operating mechanism including an hydraulically operated piston in a cylinder arranged to move a friction pad into contact with a disc, in which a mechanically actuated brake operating mechanism is provided, the mechanism consisting of a piston rod abutting the piston and being axially movable in relation to it. An actuating collar is arranged around the piston rod at a position outside the piston and is supported at a part of its circumference against movement towards the cylinder by a stop. A strut or other device is provided to enable an actuating force to be applied to the part of the collar diametrically opposite the stop to cause it to lock onto the piston rod and move the piston rod to effect application of the pad to the disk. The geometry of the actuating collar, the stop supporting the actuating collar and the piston rod are such that while the collar locks onto the piston rod when force is applied to it when that force is removed frictional forces resisting the recovering of elastic strain in the system form a couple that unlocks the collar from the piston rod so that hydraulic operation of the brake can be effected independently of the parts of the mechanically actuated brake operating mechanism other than the piston rod.

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First Claim