| 摘要 |
A wrench with a hook-shaped top jaw (1) is provided with a bottom jaw (2) adjustable to the top jaw and on a slide (3) glidably mounted on a guide portion (4) of the top jaw (1). Setting means (6) enable the slide to be at least blockable against movement in one direction along the guide portion. The bottom jaw (2) is actuable with the aid of a toggle mechanism having its loose link coupled to the bottom jaw and its other link formed as the shorter arm of a lever, with its fulcrum in the slide and its free arm forming a pivotable shank (14), said shank being formed with a passage (16) for a portion (17) of the guide portion (4) and/or some part (6, 18) connecting to the guide portion so that the pivotable shank can be swung past said portion or parts sufficiently far out in both directions from its intermediate position, corresponding to the dead center position of the toggle, so that the jaws (1, 2) may bite by the application of a returning force to the pivotable shank from either of its thus swung-out positions. |
