| 摘要 |
A wrench comprises a substantially L-shaped rod and a casing. The L-shaped rod comprises a first section and a second section, a driving portion being formed on the second section for engaging with a fastener. The casing includes a receiving section for accommodating the first section of the rod and a positioning hole for rotatably receiving a portion of the second section of the rod. An engaging member is mounted in a receptacle of the casing and biased to press against the first section of the rod, thereby exerting an engaging force between the first section of the rod and the engaging member. When a rotational force applied to the casing is smaller than the engaging force, the rod is turned to thereby turn the fastener. When a rotational force applied to the casing is greater than the engaging force, the casing slides while the rod is not turned.
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