| 摘要 |
A torque wrench in which the torquing forces are applied to the article torqued equally and oppositely in a diametrically opposed manner. The body of the wrench comprises a two-part metal frame which permits the wrench to be significantly lighter than prior art wrenches. The applied forces are provided by four hydraulic cylinders mounted in a frame, equally spaced about a central opening in which the member to be torqued is gripped. The fluid power cylinders apply force to the legs of a rotatable drive means which, in turn, rotates the member torqued. In order to provide rotation in both directions, each cylinder of the wrench is pivotable to engage two adjacent legs of the drive means and thereby permit the drive means to selectively rotate in opposite directions. The hydraulic wrench according to the invention is provided with a self-contained hydraulic system in order to create a completely portable unit which is generally free from hydraulic contamination. |
