Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Takao Suzuki0
Chikako Sasao0
Nobuyuki Matsushima0
Date of Patent
June 7, 2011
0Patent Application Number
105854770
Date Filed
January 7, 2005
0Patent Primary Examiner
Patent abstract
A wire material for a coil expander capable of manufacturing a coil expander that is unlikely to cause disadvantages such as abnormal wear and resultant reduction in strength The wire material for a coil expander is used for a coil expander of a combination piston ring having a piston ring and the coil expander for pressing and urging the piston ring outward in the radial direction thereof, wherein a cross-sectional shape thereof is a rectangular shape, and when the coil expander is formed by using the wire material for a coil expander, the surface of the wire material for a coil expander, constituting an outer peripheral surface of the coil expander, is formed into a convex curved shape.
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