Patent ID: 6341407
Filing Date: 2002-01-29
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 rotatably supports said metallic shaft member; said support member being relatively rotatable in relation with said metallic shaft member and held at any angular position by a surface friction resistance between said support member and said metallic shaft member; and said support member being molded in a synthetic resin around said metallic shaft member when a powdered synthetic resin is injected into a mold, so as to establish said surface friction resistance between said support member and said metallic shaft member due to a residual stress appeared therebetween and cooling said synthetic resin to shrink; and a shape factor (W) in reliance to said metallic shaft member and said support member being defined as follows: 1.5&lE;W&lE;3.5 whereW={1+(Do/Dh)2}/{1âˆ’(Do/Dh)2}, (Do) is a diameter of said metallic shaft member, (Dh) is a diameter or its equivalent of said support member.