Single directional sealing piston ring

Details Single directional sealing piston ring Single directional sealing piston ring

1978-11-02

1980-06-17

Maslousky, Paul E.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Position responsive

91409, F15B 1522

Patent

active

042078008

ABSTRACT:
A piston ring for use in hydraulic cylinder cushions wherein advantage is made of the typical imperfect seal characteristics of a conventional metallic piston ring to effect a cushion exhaust fluid metering action near the piston stroke end; the piston ring then uniquely allowing major fluid bypass in the reverse stroke or input fluid pressure direction for instant, full reverse stroke piston velocity response wherein the invention includes a piston ring having a notched pattern in one ring edge surface, which surface is adjacent a piston ring groove side wall, thereby eliminating the prior art need for added secondary flow circuits to accomplish the same instant out of cushion full piston velocity result.

REFERENCES:
patent: 3296942 (1967-01-01), Nelson
patent: 3396976 (1968-08-01), Reinhoudt et al.
patent: 3592106 (1971-07-01), Baughman
patent: 3626812 (1971-12-01), Trick
patent: 3776100 (1973-12-01), Yeh
patent: 3802319 (1974-04-01), Bridwell

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