Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Reexamination Certificate
2005-03-01
2005-03-01
Sandy, Robert J. (Department: 3676)
Seal for a joint or juncture
Seal between relatively movable parts
Piston ring or piston ring expander or seat therefor
C277S435000, C277S467000, C277S471000, C277S472000
Reexamination Certificate
active
06860485
ABSTRACT:
The present invention provides a piston ring comprising a piston ring main body and an expander ring arranged on an inner peripheral surface thereof, the expander ring comprising two oil expander rings, one of which is housed in a space in a spiral of the other. The expander ring is formed so that the pressing force in the diameter expanding direction is larger in a high temperature state than in a low temperature state. The expander comprises two different kinds of expander members. One of these expander members has the same functions as those of a conventional expander, and the other is a member in which there occurs a change in tension in the diametral direction with temperature. As a result, the pressing force of the master expander member having the same effects as those of the conventional expander is made variable.
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Masuyama Tetsuo
Matsushima Nobuyuki
Nippon Piston Ring Co. Ltd.
Parkhurst & Wendel L.L.P.
Patel Vishal
Sandy Robert J.
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