| 摘要 |
An adjustable powered wrench for turning threaded members consists of a wrench adapted to be positioned over a threaded member, viz. nut or bolt, for applying a torque for tightening or loosening the same. The wrench has an operating arm for transmission of power, preferably having a head with teeth forming an arcuate rack. A fluid operated cylinder has an operating piston extending therefrom which is operatively connected to a pawl with teeth which mate with the rack teeth on the head of the wrench operating arm. A first reaction arm is provided having one end with a pivotal connection thereon, e.g. ring, adapted to fit over one of the threaded members for support and having an opposite end pivotally connected to the cylinder for supporting the same. An adjustable anchor member consists of a second reaction arm having one end with a pivotal connection, e.g. ring, adapted to fit over another one of said threaded members for support. An adjustable sleeve member is slidably positioned on the second reaction arm which includes means for selectively positioning the same in different positions along the length thereof. The ring member is pivotally connected to the first reaction arm so that adjustment of the ring member is operable to adjust the position of the first reaction arm and the fluid operated cylinder relative to the wrench and to adjust for different bolt patterns.
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