Oscillating type compressor

Details Oscillating type compressor Oscillating type compressor

2007-11-06

2007-11-06

Lazo, Thomas E. (Department: 3745)

Expansible chamber devices

Piston

Side wall portion includes peripheral axially extending...

C092S245000, C277S437000

Reexamination Certificate

active

11360816

ABSTRACT:
A lip ring is attached to a piston so as to be rotatable relative to the piston in a circumferential direction, and a seal portion is provided between a ring attachment groove of the piston and an attachment portion of the lip ring. During a suction stroke, the lip ring can be rotated in a circumferential direction of the piston, thus distributing wear around the entire periphery of a lip portion of the lip ring. During a compression stroke, leakage of air from a compression chamber can be prevented by means of the seal portion provided between the ring attachment groove and the lip ring.

REFERENCES:
patent: 2246685 (1941-06-01), Johansen
patent: 2836474 (1958-05-01), Mosher
patent: 4730550 (1988-03-01), Bramstedt et al.
patent: 4924759 (1990-05-01), Plummer
patent: 5022312 (1991-06-01), Rozek et al.
patent: 5064359 (1991-11-01), Plummer
patent: 5231917 (1993-08-01), Wood

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