| 摘要 |
<p>Provided is a double-end threaded body having a right-handed thread and a left-handed thread in the circumferential surface of one solid member. Also provided is a single-nut or double-nut internally-threaded body wherein a double-end externally-threaded body and one or more internally-threaded bodies are used in combination so that the internally-threaded body does not loosen substantially and exhibits a locking effect even at an intermediate position. Further provided is a screw structure wherein a pair of internally-threaded bodies can be uncoupled only by destruction once the pair of internally-threaded bodies are coupled with each otherunder a state where the pair of internally-threaded bodies are screwed to a double-end externally-threaded body, and thereby tamper-proof characteristics can be provided in addition to a locking effect. The double-end externally-threaded body has an overlap region where a spiral, clockwise right-handed screw and a spiral, counterclockwise left-handed screw are provided while overlapping at least partially on the outer circumferential surface of a rodlike member. A right-handed internally-threaded body or a left-handed internally-threaded body that is screwed to a double-end threaded body can be used, or the both internally-threaded bodiescanbe used in combination.</p> |
