Patent ID: 6588063
Filing Date: 2003-07-08
Classification: E05D,E05Y,G06F,H04M,Y10T

Abstract:
A hinge assembly comprising:a hinge main body and a hinge pin turnably supported by said hinge main body; said hinge main body being provided with a resilient member; said hinge pin having a rotational axis and a circumference extending around the rotational axis; said hinge pin having an outer periphery; a cam portion formed in the outer periphery of the hinge pin being arranged to be press contacted by said resilient member with a pressing force; said cam portion including: a neutral portion for directing the pressing force of said resilient member toward the rotational axis of said hinge pin, and first and second cam surfaces extending in opposite circumferential directions around said hinge pin from said neutral portion and providing for converting the pressing force of said resilient member into a rotational torque for turning said hinge pin in opposite directions around the rotational axis, wherein said first and second cam surfaces include: nearby portions that are adjacent to said neutral portion and separated portions that follow said nearby portions remote from paid neutral portion; said separated portions of said first and second cam surfaces being formed by arcuate surfaces having a same radius of curvature; said neutral portion and said nearby portions being formed by an arcuate surface having a smaller radius of curvature than the radius of curvature of the arcuate surfaces forming said separated portions; a center of curvature of the arcuate surface forming said nearby portions and a center of curvature of the arcuate surfaces forming said separated portions being both located between the rotational axis of said hinge pin and said neutral portion on a line that passes through said neutral portion and that extends orthogonal to the rotational axis of said hinge pin, the center of curvature of the arcuate surfaces forming said separated portions being located apart from the rotational axis of said hinge pin, and the center of curvature of the arcuate surface forming said neutral portion and said nearby portions being located between the center of curvature of the arcuate surfaces forming said separated portions and said neutral portion.