Jack for crown or disk brakes

Details Jack for crown or disk brakes Jack for crown or disk brakes

1984-09-25

1986-03-11

Reger, Duane A.

Brakes

Wheel

Axially movable brake element or housing therefor

188196P, F16D 6554

Patent

active

045749213

ABSTRACT:
A first piston having a passageway for hydraulic fluid and a second piston slide within a cylindrical body of a jack for crown or disk brakes provided with a spring for opening the brake clamp or yoke. An extension of the first piston slides within a guide and actuates a movable pusher. A closure seal closes the passageway when the first piston touches the second piston. The axial friction force of the second piston on the cylindrical body is more than the force of the spring. The axial friction force of the second piston on the cylindrical body is more than the sum of the axial friction force of the first piston on the cylindrical body and the axial friction force of the extension on its guide, whereby the axial displacement of the first piston occurs before the axial displacement of the second piston when said pistons are actuated by same pressure. The displacement of the second piston takes up the wear of the brake linings while the displacement of the first piston effects the clamping of the brake linings on the crown or disk.

REFERENCES:
patent: 2766854 (1956-10-01), Roumens et al.
patent: 4208952 (1980-06-01), Ditlinger

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