| 摘要 |
A wrench adapted to turn a rotatable workpiece or tool about its central axis. The wrench comprises an elongated handle received through a bracket having an inwardly facing surface that engages the workpiece or tool. A pivotal connection between the inner end of the handle and the bracket permits adjustment of the handle about a pivot axis perpendicular to the longitudinal handle axis. A flexible loop is provided as a work-engaging member. It has one end connected to the inner end of the handle at one side of the pivot axis and its remaining end connected to the inner end of the handle at the opposite side of the pivot axis. Adjustment means is provided by manipulation of a sleeve surrounding a rigid inner handle section or shaft, the sleeve being both rotatable and axially movable with respect to the inner shaft. Radial cam surfaces are formed on the inner end of the sleeve and the outer end of the bracket to vary the angular position of the handle with respect to the bracket about the transverse pivot axis. Adjustment is accomplished by turning of the sleeve on the inner shaft. Abutment surfaces are provided between the cam plate and the outer end surfaces of the bracket for transmission of axial forces between the sleeve and handle shaft. The axial forces are adjusted by rotation of a threaded nut that encircles the outer end of the handle shaft and abuts the outer end of the sleeve. The wrench can be clamped to the workpiece or tool, or can be alternately clamped and released as it is oscillated about the central axis of the workpiece or tool.
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