Patent ID: 6490758
Filing Date: 2002-12-10
Classification: E05D,E05Y,G06F,Y10T

Abstract:
A frictional hinge device comprising:a metallic shaft member having a rotational axis as a rotational center; a support member which rotationally supports said rotational axis of said metallic shaft member; said metallic shaft member being molded in a synthetic resin around said metallic shaft member integrally and being rotationally held at any angle by a surface frictional resistance caused between said support member and said metallic shaft member due to a shrinkage allowance of said support member when molding said synthetic resin around said metallic shaft member; an outer surface of said metallic shaft member being processed with a surface treatment to attain a surface roughness (Ra) ranging from 0.15 to 0.35 &mgr;m; and said surface treatment providing a Niâ€”P plating layer, and said Niâ€”P plating layer being polished with a buff so that a thickness of said Niâ€”P plating layer ranges from 5.0 to 15 &mgr;m.