| 摘要 |
A wrench comprises a lower jaw member which has a handle portion, and is provided with a lower grip teeth portion formed in its front end surface adjacent to which a longitudinal guide hole is formed therein; an upper jaw member which has a substantially reversed-L shape, and is provided with a leg portion inserted into the guide hole of the lower jaw member in a slidable manner, and has an upper grip teeth portion formed in a head portion thereof so as to be opposite to the lower grip teeth portion of the lower jaw member, and has a longitudinally elongated hole formed in the leg portion; a swingable pawl which is inserted into the elongated hole of the upper jaw member and supported by a supporting pin both ends of which are mounted on opposite walls of the guide hole of the lower jaw member, and engages with a side wall of the elongated hole of the upper jaw member in detachable manner; and a spring for urging the upper jaw member always to its gripping position.
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