| 摘要 |
A wrench or one way drive has a flexible head ( 2 ) with a split aperture ( 20 ) for loosely engaging a separate drive such as a socket or the head of a fastener ( 31 ) including a nut, bolt, screw or the like. Cam means, preferably pins ( 11,11 a), are located on a handle ( 3 ) and engage the head ( 2 ) preferably through slots ( 21,22 ) in the head. The slots diverge outwardly so that as the handle is moved relative to the head the split aperture ( 20 ) closes and the flexible head ( 2 ) increasingly clamps a drive socket as more torque is applied to the handle.
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