| 摘要 |
PROBLEM TO BE SOLVED: To provide an adjusting worm for a wrench which eliminates feeling of discomfort, in a thumb caused by a sharp corner of tips of teeth, when a user turns adjustment worm for a wrench using the fingers. SOLUTION: Teeth, extended spirally, are provided to the outer periphery edge of the core having a hole. The teeth are respectively provided with two side ends, having an arc inwardly concaved actually. Connecting parts between tips of two arcs and the tip of the tooth have a fillet respectively, whereby two tip corners of the tooth are made substantially smooth. |
