Variable tension ring mechanism

Details Variable tension ring mechanism Variable tension ring mechanism

2006-07-21

2008-12-09

Lazo, Thomas E (Department: 3745)

Expansible chamber devices

Piston

Radially adjustable side wall portion

C092S207000, C277S470000

Reexamination Certificate

active

07461583

ABSTRACT:
A piston assembly is described including a connecting rod and a piston head secured to the connecting rod and in operational communication with the connecting rod. The piston head has a circumferential groove extending inwardly from an exterior surface of the piston head. The piston head further has a compression mechanism aperture disposed proximate the groove. An oil ring expander is disposed generally within the groove. The expander includes a gap between a first expander end and a second expander end. The gap is proximate the compression mechanism aperture. At least one lever arm is in mechanical communication with the connecting rod. The at least one lever arm has a tab disposed between the first expander end and the second expander end.

REFERENCES:
patent: 4926811 (1990-05-01), Parsons
patent: 5058488 (1991-10-01), Cullen et al.
patent: 6484622 (2002-11-01), Hamelink et al.
patent: 6860485 (2005-03-01), Masuyama et al.

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