| 摘要 |
A spanner includes a socket disposed rotatably in an outer wall defined by a head portion of an operating lever. The operating lever includes a neck portion defining a wheel-retention recess. A cam wheel is pivotally disposed in the wheel-retention recess, and constantly engages a recess-confining wall that defines the wheel-retention recess. The cam wheel is turnable in the wheel-retention recess, and has at least one engaging portion which moves toward and engages the socket when the cam wheel turns in a first direction, and a non-engaging portion which moves toward and disengages from the socket when the cam wheel turns in a second direction opposite to the first direction.
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