Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1987-03-23
1988-01-19
Halvosa, George E. A.
Brakes
Wheel
Axially movable brake element or housing therefor
188 726, 188 727, 188 729, 188106F, 188196D, 192111A, F16D 6556
Patent
active
047199970
ABSTRACT:
A parking brake mechanism in a disc brake includes a bottomed tubular adjusting nut slidably fitted in a bore defined in a cylinder bottom coaxially with a piston with a seal ring interposed and having a closed end projecting into the cylinder and coupled to piston, an adjusting bolt axially movably threaded in the adjusting nut and having a head projecting out of the cylinder, a first spring interposed between the head and the cylinder bottom for normally urging the adjusting bolt in a direction out of the cylinder, a thrust bearing interposed between the head and the first spring for ensuring smooth rotation of the adjusting bolt, a pusher disposed coaxially with the adjusting bolt and having in one end a slot substantially perpendicular to an axis of the adjusting bolt, the pusher serving as a clutch for selective engagement with the head, a second spring for normally urging the pusher in a direction out of the cylinder, a plate having an intermediate portion extending through the slot and interposed between the pusher and the head, the plate serving as a second thrust bearing selectively engageable with a central top surface of the head, a cam shaft rotatably supported by a caliper and having a cam slot opening toward an opposite end of the pusher, the cam shaft having a parking lever secured thereto, and a toggle interposed between the cam slot and the opposite end of the pusher for axially moving the pusher in response to angular displacement of the cam slot.
REFERENCES:
patent: 3507367 (1970-04-01), Brown et al.
patent: 3633712 (1972-01-01), Farr
patent: 3783981 (1974-01-01), Burgdorf
patent: 3983975 (1976-10-01), Wright
patent: 4056173 (1977-11-01), Farr
patent: 4544045 (1985-10-01), Runkle
Aisin Seiki Kabushiki Kaisha
Halvosa George E. A.
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