Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Reexamination Certificate
2004-01-31
2009-02-24
Engle, Patricia (Department: 3673)
Seal for a joint or juncture
Seal between relatively movable parts
Piston ring or piston ring expander or seat therefor
C277S490000
Reexamination Certificate
active
07494129
ABSTRACT:
The invention relates to a piston ring comprising a slit forming a joint, a bearing surface, an inner peripheral surface, and upper and lower flanks extending thereinbetween. An inconstant cross-sectional interruption is provided in the region of the inner peripheral surface and, seen from the peripheral direction, is larger in the region of the joint than in the region which diametrically opposes the joint. The wall thickness of the inventive piston ring varies in the peripheral direction and is smaller in the region of the joint than in the region which diametrically opposes the joint. The relation between the wall thickness and the cross-sectional interruption is always such that the piston ring has a constant torsional angle, seen over the periphery.
REFERENCES:
patent: 1645146 (1927-10-01), Kinsley et al.
patent: 2325298 (1943-07-01), Barnes
patent: 2591920 (1952-04-01), Colvin
patent: 2970023 (1961-01-01), Thompson
patent: P.A. 092616 (1954-02-01), None
patent: 3920449 (1991-01-01), None
patent: XP 002286090 (1976-04-01), None
patent: 58207575 (1983-03-01), None
patent: 59043260 (1984-10-01), None
patent: 02229964 (1990-09-01), None
patent: 09196171 (1997-07-01), None
patent: 504906 (1976-02-01), None
English Translation of SU 504906, May 2007.
Die Twistwinkel Des L-Formigen Kolbenringes, 1975, Eng. Abstract, p. 3.
Breuer Claus
Mittler Richard
Dickinson Wright PLLC.
Engle Patricia
Federal Mogul Burscheid GmbH
Lee Gilbert
Stearns Robert L.
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