Seal

Details Seal Seal

1980-04-28

1981-12-15

Ward, Jr., Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 65, 277 27, 277 72R, 277 74, 277 2, F16J 1538, F16J 1546

Patent

active

043055931

ABSTRACT:
A shaft seal assembly with open mode capabilities has markedly simplified construction. A shiftable ring on the shaft is axially biased against a complemental, stationary shoulder circumscribing the shaft to form a pair of radially spaced annular seals concentric to the shaft. A fluid pressure port on the shoulder intermediate the seals permits selective shifting of the ring away from the shoulder to open the annular seals and place the seal assembly in the open mode wherein the shaft may be rotated without wearing the seals. In preferred forms, the seal assembly is provided with a vent between it and the shaft bearing to relieve pressure against the bearing when the seal assembly is shifted to the open mode, and also to serve as a leak indicator.

REFERENCES:
patent: 2614793 (1952-10-01), Storm
patent: 3144035 (1964-08-01), Hablanian et al.
patent: 3181873 (1965-05-01), Reed
patent: 3591188 (1971-07-01), Eisner
patent: 3662894 (1972-05-01), Bockler
patent: 4013297 (1977-03-01), Smith
patent: 4101139 (1978-07-01), Nordin
patent: 4256314 (1981-03-01), Berglund et al.

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