| 摘要 |
PROBLEM TO BE SOLVED: To reinsert a coil type female screw bush many times without breaking the pitch of a screw by providing a groove to be easily hooked by the blade of an extracting tool. SOLUTION: The main body 1 of this coil type female screw bush is provided with an inserting tool hooking corner 2, a groove 3 for folding the corner after completion of insertion, and an extracting groove 4 on the last pitch. When the coil type female screw bush is inserted into a fitting member too much, or its screw pitch is unmatched, or it is abraded to need replacement, the blade of an extracting tool is inserted, and a handle is rotated for the extracting work. The extracting tool makes a round motion around one end of the blade with the other end of the blade hooked on the groove 4. The coil type female screw bush is rotated with a gap formed between its tip and the fitting member, and it can be easily extracted without breaking the pitch of the screw regardless of the fitting member.
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