Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1976-05-26
1978-01-24
Lanham, C.W.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
294205, 72373, 72377, B23P 1510
Patent
active
040695719
ABSTRACT:
A wheel cylinder piston is made of sintered powdered metal having a boss provided with a flare on the bossed end surface to assist in holding the wheel cylinder boot in place on the piston. The piston is of the type that directly engages an abutment on a brake shoe instead of utilizing a pin to transmit force between the piston and the brake shoe. The flare is formed by striking a peripherally extending surface section of the boss end with an annular mandrel, the striking action axially compressing a cylindrical portion of the boss and creating an annular shear fracture extending substantially parallel to the center line of the boss. The compressed section extends to a depth controlled by the striking force and stroke and characteristics of the powdered metal material. The sheared cylindrical portion flares outwardly to form a flared end on the boss.
REFERENCES:
patent: 2199620 (1940-05-01), Davis
patent: 2236180 (1941-03-01), Kost
patent: 2347219 (1944-04-01), Schnell
patent: 3014609 (1961-12-01), Hobbs
patent: 3091838 (1963-06-01), Hild et al.
Nelson Richard P.
Roth William H.
Crane Daniel C.
General Motors Corporation
Lanham C.W.
McGraw D. D.
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