Importance

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Abstract

A torque wrench comprising an elongate, straight tubular lever with open front and rear ends, a work-engaging head at the front end of the lever and having a lever arm projecting into and pivotally connected with the front end portion of the lever, an elongate crank projecting freely rearwardly into the lever, an elongate axially biased compression spring extending longitudinally in the lever rearward of the crank, cam means between the spring and the crank normally releasably holding the crank concentric in the lever and operating to allow the crank to pivot and strike a side of the lever when a predetermined set operating force is exerted between the head and the lever through and about the axis of the lever arm. The wrench next includes adjusting means to vary the bias on said spring to adjust the operating force. Said means includes a plug set in the lever rearward of the spring, an elongate screw is engaged through the plug. The front end of the screw engages the rear end of the spring. A manually engageable knob is connected with the rear end of the screw and is spaced rearward from the lever. Said knob has a forwardly projecting sleeve engaged about the rear portion of the lever and a forwardly opening annular recess at the rear end of the sleeve. Said sleeve has longitudinally circumferentially extending calibrations at its central portion. An elongate tubular hand grip is slidably engaged about the rear portion of the lever, about the sleeve and normally entered into said annular recess. The rear end of the grip defines a reference edge which cooperates with the calibrations on the sleeve when the grip is shifted axially forward to a stopped actuated position. Stop means stop rotation of the grip relative to the lever and stop forward movement of the grip relative to the lever at said actuated position. Indexing means releasably lock the knob in set rotative position relative to the grip when the grip is in its normal position.

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First Claim