Patent ID: 6974010
Filing Date: 2005-12-13
Classification: E05Y,F16D

Abstract:
1. A clutch mechanism comprising: a first rotational member supported to be rotated by a driving force from a driving power source; a rotatably supported second rotational member coaxially positioned with respect to the first rotational member; an operating spring extending along a peripheral surface of the first rotational member and a peripheral surface of the second rotational member, the operating spring having a first end and a second end, with the first end attached to the first rotational member so that the first end of the spring rotates with the first rotational member; restraining means for restraining rotation of the second end of the operating spring during rotation of the first rotational member in one direction so that during rotation of the first rotational member in the first direction the diameter of the operating spring is reduced to cause the operating spring to engage the peripheral surface of the second rotational member so that the first and second rotational members rotate together, wherein said restraining means includes at least one braking member having an engaging portion engageable with the second end of the operating spring; and a collar member installed towards the second end of the operating spring, the at least one braking member being rotatably disposed at the collar member and generating a radially directed biasing force relative to a circumferential contact surface of the collar member.