Expanding helical seal for pistons and the like

Details Expanding helical seal for pistons and the like Expanding helical seal for pistons and the like

1980-12-05

1982-06-08

Ward, Jr., Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277138, F16J 1516, F16J 904

Patent

active

043336612

ABSTRACT:
A seal 34 formed of a resilient helical coil 42 which is stressed at its small end to form a stationary seal in its groove 36 and stressed to unwind at its large end 44 to form a dynamic seal against the cylinder wall 22. A helical coil 56 of low friction material can be interleaved to supply dry lubricant.

REFERENCES:
patent: Re27338 (1972-04-01), Cowans
patent: 206695 (1878-08-01), Vivarttas
patent: 208368 (1878-09-01), Brown
patent: 791073 (1905-05-01), Callan
patent: 1727732 (1929-09-01), Ryan
patent: 2125541 (1938-08-01), Carlton
patent: 2585952 (1952-02-01), Marien
patent: 2809080 (1957-10-01), Mittell et al.
patent: 2871072 (1959-01-01), Parks et al.
patent: 3162185 (1964-12-01), Knoblock
patent: 4239245 (1980-12-01), Giglio et al.

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