Gratec, Inc.

Ron Graham

Thomas Aparicio, Jr

Dave D Nagel

A powered ratchet wrench for turning threaded members, such as nuts or bolt heads, consists of a wrench assembly having a reaction arm adapted to be positioned over a threaded member, viz. nut or bolt, for supporting the same and operating a socket wrench through a ratchet mechanism applying a torque for tightening or loosening the nuts or bolts. The wrench assembly has a box shaped housing with an open end portion supporting a ratchet mechanism and a double-acting fluid operated cylinder having an operating piston extending therefrom for operating the ratchet mechanism. The ratchet mechanism consists of a ratchet wheel supported between two plates on bearing sleeves extending from side to side at the open end portion of the housing. A pair of pawls with driving teeth engage opposite sides of the ratchet wheel and are spring biased toward engagement with the ratchet teeth. The pawls are pivotally supported on each other and on the ratchet wheel supporting plates. The operating cylinder is supported on the housing with its piston secured to one of the pawls for driving the pawls to rotate the ratchet wheel on extension of the piston and to rotate the pawls in a ratcheting movement relative to the ratchet wheel on retraction of the piston.

Powered ratchet wrench

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.

Growing community of inventors

Norco, CA, United States of America

Ron Graham