Metal working – Means to assemble or disassemble – Spreading parts apart or separating them from face to face...
Patent
1990-04-10
1991-05-28
Watson, Robert C.
Metal working
Means to assemble or disassemble
Spreading parts apart or separating them from face to face...
29266, B23P 1904
Patent
active
050182617
ABSTRACT:
A piston pushing tool is disclosed for use in disc brake assemblies having a caliper housing. The housing provides a piston receiving bore in which a piston is reciprocably disposed, with the bore being open at one end and closed at its opposite end. An outboard shoe support bracket is spaced axially apart from the open end and has axially outer and inner surfaces and an opening therethrough generally aligned with the bore. The piston is a hollow cylindrical piston with the first end adjacent the closed end of the bore, and a second end adjacent the open end of the bore. The tool comprises a threaded shaft having a distal end, a proximal end, and an intermediate portion, with the shaft being proportioned and designed to extend axially through the opening in the support bracket. A handle is attached to the proximal end of the shaft for rotating the shaft. A first plate is engaged on the intermediate portion of the shaft for abutting the axially inner surface of the support bracket, while a second plate is engaged on the distal end of the shaft for abutting the second end of the piston. Upon rotation of the handle, the second plate is driven away from the first plate, thereby pushing the piston fully into the piston receiving bore.
REFERENCES:
patent: 2592420 (1952-04-01), Harrison
patent: 2859456 (1958-11-01), Taylor
patent: 3055093 (1962-09-01), Ruble
patent: 3786551 (1974-01-01), Gregg et al.
patent: 3835522 (1974-09-01), Ward
patent: 4009515 (1977-03-01), Racin
patent: 4105344 (1978-08-01), Rovsom
patent: 4694569 (1987-09-01), Colvell et al.
patent: 4903391 (1990-02-01), Franks
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