| 摘要 |
A torque wrench for applying torque to a component ( 21 ) is described. The torque wrench has an engaging member ( 18 ) for engaging the component ( 21 ) to be rotated about an axis ( 22 ) and a ratchet member ( 25 ) connected to the engaging member ( 18 ). A drive lever ( 14 ) is connected to the engaging member ( 18 ) via the ratchet member ( 25 ) such that rotation of the drive lever ( 14 ) in one sense about axis ( 22 ) applies torque to the engaging member ( 18 ) and rotation of the drive lever ( 14 ) in the opposite sense applies torque below a predetermined value to the engaging member ( 18 ). A connecting member ( 12 ) is pivotably connected to the drive lever ( 14 ) remote from the engaging member ( 18 ) and is adapted to be engaged by a head ( 10 ) of a piston ( 6 ) having reciprocating linear movement to alternately rotate the drive lever ( 14 ) in opposite senses about axis ( 22 ). The connecting member ( 12 ) is slidable relative to the piston head ( 10 ) in a direction transverse to the direction of reciprocal linear movement.
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