| 摘要 |
<p>A hydraulically operated wrench which can be used either for simultaneously tightening or loosening two threaded connectors or to apply the full force of the wrench to tighten or loosen only a single threaded connector. The wrench includes a cylinder (1) and a piston (3) reciprocating therein, connecting means (9) connected to the cylinder (1), a drive lever (11) mounted intermediate its ends on the connecting means (9) for pivoting about a first pivot axis (A1) and operatively connected at one end to the piston (3) while being provided at the other end with a polygonal opening for engaging a polygonal member of a first threaded connector to be turned. A drive link (29) provided at one end with a polygonal opening for drivingly engaging a polygonal member of a second threaded connector to be turned and an anchoring link (30) provided at one end with an opening for turnably surrounding the polygonal member of the second theraded connector may be selectively attached at the other end to the connecting means (9) for pivoting about a second pivot axis (A2) spaced from and parallel to the first pivot axis (A1). The wrench may also incorporate an arrangement for exactly changing the distance between the first and the second axes (A1 and A2).</p> |
