Piston and piston ring assembly

Details Piston and piston ring assembly Piston and piston ring assembly

2006-05-16

2006-05-16

Knight, Anthony (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Piston ring or piston ring expander or seat therefor

C277S434000, C277S449000, C277S460000

Reexamination Certificate

active

07044473

ABSTRACT:
Two seal rings are provided comprising an upper ring and a lower ring, the rings having a common axis, a common outer cylindrical surface, a common inner cylindrical surface, and a couple of facing surfaces. The facing surfaces form an engaging length in a radial section of the rings having a radially outer end and a radially inner end, and the facing surfaces and the common cylindrical surface define a first wedge-shaped gap with a radially inward leading edge at the outer end. The inward leading edge is provided with a first angle in a range of 10 seconds to 1 degree and 30 seconds, and the outer end is spaced more from the common cylindrical surface than from the common cylindrical inner surface.

REFERENCES:
patent: 1368447 (1921-02-01), Megson
patent: 1534766 (1925-04-01), Briney
patent: 1547917 (1925-07-01), Holverson
patent: 2056099 (1936-09-01), Grimm
patent: 6113107 (2000-09-01), Wang et al.

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