Abstract: In a pneumatically driven power torque wrench comprising a frame stopped from movement relative to a related structure, a hydraulic cylinder and ram unit carried by the frame, a work output shaft rotatable relative to the frame and coupled with work to be turned in axial alignment therewith, a lever arm with one end freely rotatably engaged about the shaft and its other end drivingly coupled with the cylinder and ram unit; and ratchet means between the shaft and lever arm. The ratchet means comprises a ratchet wheel about the shaft and a plurality of circumferentially spaced spring-loaded pawls pivotally carried by the lever arm and engaging the wheel. The shape and the circumferential spacing of the teeth on the wheel and the pawls are such that when rotary driving engagement is established between the shaft and the lever arm, the central rotative axes of the work, shaft and said one end of the crank are concentric, independent of any bearing support between the shaft and the frame.

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.

Abstract: A pneumatically driven power torque wrench comprising an elongate frame with front and rear ends, a transversely extending drive shaft rotatably carried by the frame at the front end thereof; a ratchet drive to rotate the shaft and including a ratchet wheel on the shaft; a drive ring about the wheel; circumferential pawls between the wheel, the ring and an elongate lever arm projecting from said ring. The wrench further includes a cylinder and ram unit fixed to and extending between the lever arm and the rear end of the frame and a work-engaging tool carried by the shaft, at one end thereof, and engaging a fastener concentric therewith. The wrench next includes a reaction device to anchor the rear end of the frame against rotation about the axis of the shaft.

Abstract: An adjustable torque wrench including an elongate tubular lever arm, a work-engaging head at the front end of the arm, an elongate adjustable screw within and accessible at the rear end of the arm, a polygonal driver carried by the screw within the arm, a hand grip with a front section fixed about the arm and a rear section normally adjacent the rear end of said front section and rear end of the arm, an elongate drive sleeve on and projecting forwardly from the rear section into the arm and about the driver; said sleeve has a cylindrical opening in its rear portion to normally freely accommodate the driver and a polygonal opening in its front portion to establish driving engagement with said driver when the rear section is moved rearwardly; said rear section has a forwardly projecting annular skirt with circumferentially spaced axially extending grooves; said front section has a rear extension with circumferentially spaced axially extending ribs normally engaged in the skirt and the grooves; the rear end of t

Abstract: A torque wrench tester comprising a single elongate deflection beam, a plurality of torque wrench engaging input shafts drivingly connected with the beam at points spaced longitudinally thereof and each to deflect the beam in response to a predetermined range of torsional forces applied thereto and a single dial indicator related to the beam to increase deflection thereof and having calibrations for each range of forces to be measured.

Abstract: A drive socket with front and rear end portions defining front and rear ends, an elongate, forwardly opening polygonal work receiving socket and an elongate, rearwardly opening polygonal drive tool receiving opening, said drive socket defined by a multiplicity of flat radially extending sheet metal laminates in intimate juxtaposition and having registering openings in radial and circumferential spaced relationship about the axis of the drive socket, elongate tie members engaged through the registering openings with ends in stopped engagement with the front and rear ends of the drive socket, the laminates having central openings corresonding in configuration with the cross-section of the work receiving socket and drive tool receiving opening in their related portions of the drive socket.

Abstract: A torque wrench adapted to applying predetermined maximum torque onto related work comprising an elongate lever arm, a work engaging ratchet head including a body coupled to one end of the arm and adapted to be rotated by the arm, a spindle with a work engaging projection rotatable in the body and ratchet means between the spindle and body to establish driving engagement therebetween when the body is rotated in one direction by the arm, a manually controlled prime mover carried by the wrench in substantially fixed position relative to the body and transmission means between the prime mover and the spindle, said prime mover and transmission operable to selectively rotate the spindle in said one direction and in overriding relationship to the ratchet means, the torque delivered to the spindle by the prime mover being less than the predetermined maximum torque to be applied by the wrench on to related work.