Automatic adjuster for hydraulic brake actuator
AssigneeLucas Industries Limited
InventorHeinz W. Baum
Life of this patent
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Abstract
The adjuster has a clutch mechanism operative between an actuator piston and an auxiliary mechanical actuator. The clutch mechanism includes a first member and a second member, one of the members being connected to the actuator piston for axial movement therewith at all times in both directions and the other of the members being connectible with the mechanical actuator. The one member is free to move back and forth with the actuator piston during normal service brake applications, the other member not hindering its movement. Also, the other member is only moved to engage the one member upon actuation of the mechanical actuator. Thus the actuator piston is free to move back during "knockback" and normal braking is not hindered by the clutch mechanism.
Claims6
An automatic adjuster for a hydraulic actuator for a vehicle brake comprising a housing, a clutch mechanism in said housing operative between a piston of the actuator and an auxiliary mechanical actuator, the clutch mechanism comprising a threaded rod and slit nut, the rod being threadedly engaged with said slit nut and one end of the rod being rotatably secured to the actuator piston for axial movement therewith at all times, said slit nut being biassed towards a rest position in which the slit nut engages a fixed stop, the threaded rod being freely rotatable and axially movable relative to said slit nut when the slit nut is in said rest position, said slit nut and threaded rod being constructed to grip together only upon actuation of the auxiliary mechanical actuator.
Dependencies are inferred from the claim text.