Patent ID: 6966735
Filing Date: 2005-11-22
Classification: F16B

Abstract:
1. A screw mechanism having a member to be tightened being tightened and fixed by screwing screw member on a tightening side to a second screw member, comprising: structures having a pair of inclined surfaces interpose between the screw member on the tightening side and the member to be tightened in a mutually contacted state; said inclined surfaces circling around substantially once in spiral form with a lead smaller than a lead of the screw, both ends thereof having a tier face in the axial direction interposed therebetween; said inclined surfaces being formed on mutually contacting surfaces of a pair of washers interposed between the screw member on the tightening side and the member to be tightened; and a pre-fixing means for pre-fixing both of the pair of washers to break away with a rotating torque of a tightening in a state of making said inclined surfaces of said pair of washers coming into contact with each other, and said pair of tier faces being spaced with a prescribed interval.