Adjustable torque wrench

An improved torque wrench comprising an elongate tubular handle one end of which has a tube coaxial with and overlying the handle, the tube forming a hand grip rotatable with respect to the handle, a screw threaded member extending within the handle at said one end and connected to be rotatable with said tube, a nut on the screw threaded member restrained against rotation relative to the handle but longitudinally movable in said handle, the nut forming a means to adjust the compression of a spring acting on one end of a lever arm, extending along the tubular handle and connected with a work engaging member at the other end of the handle, the spring maintaining the lever arm in a first stable position, application of torque through the handle to the workpiece and exceeding a value set by compression applied to the spring by the nut causing the lever arm to pivot to a second unstable position to provide indication of the set torque loading, the arm thereafter returning to the said first stable position on release of the torque load, wherein the improvement comprises a scale means to indicate the torque loading set by the compression of the spring, the scale means being positioned concentrically around the handle and having a first dynamic splined member rotatable within an end of the hand grip and a second fixed splined member secured to the handle, the splined members being positioned one within the other, the number of splines on each respective spline member differing, the end of the hand grip having a flat or flats engaging a portion of the peripheral surface of the said dynamic spline to force same to engage the said fixed spline, the said dynamic spline being associated with a scale member rotatable relative to an indicator.