Patent ID: 8303222
Filing Date: 2012-11-06
Classification: F16B

Abstract:
1. A fastening body structure for fastening a fastening piece in an installation section with a screw member, the structure comprising: a screw comprising a head having a countersunk form, wherein the head is provided in one end of a male screw part configured to be used together with a female screw part provided in the installation section, and a washer made of a shape memory alloy, wherein the washer has an inner diameter corresponding to the male screw part of the screw, and wherein a part of an annular portion of the washer is cut off, wherein the inner diameter of the washer is larger in a restoring shape than an outer diameter of the screw head, wherein the washer assumes the restoring shape at or above a restoring temperature, the screw head is configured to be smaller in diameter than a screw hole of the fastening piece, and the washer is configured to be larger in diameter than the screw hole of the fastening piece, an unevenness part is provided on a slope surface formed on a lower surface of the screw head being in contact with the washer made of a shape memory alloy, or on a screw contact surface of the washer made of a shape memory alloy being in contact with the screw, and the unevenness part is formed to extend from an inner diameter side to an outer diameter side of the screw head, or from the inner diameter side to an outer diameter side of the washer made of a shape memory alloy.