Four point seal

Details Four point seal Four point seal

1987-06-05

1989-05-09

Garrett, Robert E.

Expansible chamber devices

Annular working member or annular linearly extending chamber...

Axially extending hollow stem on working member

192 85CA, 277166, 277235R, 277206A, F01B 3100

Patent

active

048278343

ABSTRACT:
An annular seal of the four point type in which a pair of annular seals are provided on one side of the seal to provide an effective pressure seal for the associated pressure chamber and a further pair of seals are provided on the other side of the seal to preclude the entry of contaminants into the sealing interface. The seal is formed as an assembly including a rigid insert ring member and an annular seal member of elastomeric material having a rectangular configuration in transverse cross section defining the four separate annular sealing surfaces at each of its four corners. In one form of the invention, the annular insert member comprises a discrete ring member which is substantially totally encapsulated by the surrounding elastomeric material and in a further form of the invention the insert member is constituted by the free annular end portion of an annular piston member to which the elastomeric sealing material is bonded to form the seal assembly.

REFERENCES:
patent: 2295678 (1942-09-01), Miller
patent: 2309446 (1940-04-01), Ekkebus
patent: 2895773 (1959-07-01), McConnaughey
patent: 2935349 (1960-05-01), Burch
patent: 3009721 (1961-11-01), Newton et al.
patent: 4328972 (1982-05-01), Albertson et al.
patent: 4428590 (1984-01-01), Pippert
patent: 4601374 (1986-07-01), Ladin
3 pages of brochure of Minnesota Rubber Co. entitled Fact Book and Design Guide.

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