| 摘要 |
A power wrench which includes a driving unit for driving a wrench head, a casing for the driving unit, a support foot carried nonrotatably by the casing for offsetting reaction forces created by the driving unit, a pressure member, a spherical ball and socket connection between the pressure member and the support foot whereby the pressure member automatically assumes a position in total contact with a support surfaces to avoid local peak stresses during the operation of the power wrench, the casing including a polygonal peripheral outer surface profile, and the support foot having a slide ring whose profile is formed by faces which engage and effectively lock against those of the casing.
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