DROP PREVENTING DEVICE AT LOOSENED STATE OF FASTENING BOLT

摘要

PROBLEM TO BE SOLVED: To prevent breakage of a thread ridge on detaching of a mounted body in a not disengaging state, by confirming a threadedly disengaging state of a bolt, in a device for preventing disengagement of the bolt at the time of detaching the mounted body by loosening the bolt after the mounted body is fixed to the base by fastening the bolt. ;SOLUTION: The bolt 3 is normally threadedly engaged and a bolt male screw part 3b is fastened to a female screw hole 2c of the mounted body. At the time of disassembly, the bolt 1 is loosened by being reversely threadedly rotated to store the bolt male screw part 3b into a counterbored hole 2b, thereafter the bolt 1 is constituted to be movable through a turnout elongate hole 2d for underhead thin rod contiguous to the female screw hole 2c of the mounted body and a turnout counterbored hole 2e for the bolt male screw part contiguous to the counterbored hole 2b. Accordingly, whether the bolt is threadedly disengaged or not can be confirmed by a transition position of the bolt, whereby the bolt can be prevented from being threadedly engaged again due to an undesired vibration of an external force.;COPYRIGHT: (C)2001,JPO