Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1987-08-12
1989-01-10
Butler, Douglas C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 724, 188 726, 188 728, 188 7332, 188 723, 188106F, 188196M, F16D 5502, F16D 5526
Patent
active
047967293
ABSTRACT:
A wheel disc brake system for a motor vehicle connected to a brake fluid pressure system that includes a pressure relief apparatus for moving the inner piston of the wheel brake back into the brake housing piston chamber by an Allen wrench insert into an axial tool hole at the front face of the inner piston accessed through the axial oil hole of the outer piston. Rotation of the wrench rotates the inner piston along the actuating screw member in the brake housing and so moves the inner piston away from the outer piston so that the outer piston can be easily pushed into the brake housing and new brake pads mounted to the calipers. Reverse rotation of the wrench pulls the inner and outer pistons back into operational position. The invention also includes a cylindrical nose extending from the inner piston having at least one seal to defend the tapered actuating areas of the inner and outer pistons from contamination through the oil hole of the outer piston. The invention also includes a non-drag pressure apparatus mounted to the leaf face of the inner piston including a leaf spring ring and a retaining ring mounted to a groove in the wall of the outer piston, with the leaf spring ring exerting only sufficient pressure to start rotational movement of the inner piston along the actuating screw member upon activation of the brake fluid system.
REFERENCES:
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patent: 3980159 (1976-09-01), Baxendale
patent: 4064973 (1977-12-01), Deem et al.
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patent: 4319668 (1982-03-01), Johnson et al.
patent: 4390084 (1983-06-01), Haraikawa et al.
patent: 4503946 (1985-03-01), Davidson et al.
patent: 4619347 (1986-10-01), Schreiner et al.
patent: 4633978 (1987-01-01), Hoff
patent: 4635761 (1987-01-01), Smith et al.
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