| 摘要 |
A hydraulic wrench includes a housing formed with two parallel cylinder bores in which axially displaced pistons are guided movable between an active forward stroke and a return stroke. A pair of piston rods are each pivotally connected at one of the ends thereof to a respective one of said pistons and at the other ends pivotally connected to a pair of drive arms which are freely turnably mounted on a shaft, which in turn is mounted for rotation about an axis normal to and transversely spaced from the cylinder bores. At least one pair of ratchet gears are mounted on the shaft for rotation therewith, with the teeth on one gear displaced in circumferential direction with respect to the teeth on the other gear, and at least one pair of pawls are pivotally carried by the drive arms for respectively engaging with the teeth of the two ratchet gears to rotate the shaft in one direction during the active forward stroke of each piston. The shaft carries an exchangeable socket for turning a threaded connector engaged in the socket during rotation of the shaft, whereby during such turning of the threaded connector in one direction a counterforce is created tending to turn the housing about the axis of the shaft in the opposite direction. A plate connected to the housing is adapted to engage a fixed abutment adjacent to the threaded connector to be turned to thus counteract this force.
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