| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a wrench that can satisfactorily fasten a bolt or a nut. <P>SOLUTION: A wrench includes a handle part 10 and socket part 20 having a flexible cylindrical sidewall part 21 for inserting an N-polygonal head 1 of a bolt or an N-polygonal nut 2 (N is a natural number of three or more). The socket part 20 includes: locking regions A having first protrusions 31 protruding from an inner circumferential surface inward and locking with corner parts 3A at positions locking with 2-(N-1) corner parts formed at the head 1 of the bolt or the nut 2 when inserting the head 1 of the bolt or the nut 2 and second protrusions 32 positioned at the first protrusion 31 side rather than corner parts 3 adjacent to the corner parts 3A locked by the first protrusions 31 in the opposite direction of the fastening direction and protruding from the inner circumferential surface inward to lock with the corner parts 3A; and non-locking regions B having an inner circumferential surface 33 with no irregularity facing the corner parts 3B not locked by the first protrusions 31 when inserting the head 1 of the bolt or the nut 2. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
