Back-up ring for cup seal

Details Back-up ring for cup seal Back-up ring for cup seal

1977-06-09

1980-02-19

Freeh, William L.

Pumps

Expansible chamber type

Pumping member position controlled port

417493, F04B 3910, F04B 704

Patent

active

041892879

ABSTRACT:
A brake cylinder includes a housing within which a piston is reciprocable, such piston acting on a cup seal. An annular resilient member of, for example, polyurethane material, is interposed the outer periphery of the cup seal and the adjacent outer periphery of the piston, and cooperates with such piston to engage the inner surface of the bore to prevent any portion of the seal being pinched between a portion of the piston and the inner surface of the bore.

REFERENCES:
patent: 1333211 (1920-03-01), Moss
patent: 2197125 (1940-04-01), Cox
patent: 2656680 (1953-10-01), Brunner
patent: 3800541 (1974-04-01), Sindelar
patent: 4066153 (1978-01-01), Plentz

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