Abstract: A torque wrench comprising a hollow housing comprising an outer wall and an inner wall each having a proximal end and a distal end, the inner wall being spaced from the outer wall so as to provide a gap therebetween, the proximal end of the outer wall being connected to the proximal end of the inner wall, and the distal end of the outer wall being configured to engage a workpiece housing; a mechanical multiplier disposed within the inner wall, the mechanical multiplier comprising a torque input shaft and a torque output shaft, the mechanical multiplier being connected to the inner wall, and the torque output shaft being configured to engage a workpiece fastener; and a torque monitoring system comprising at least one strain gauge mounted to the inner wall proximally of the midpoint of the inner wall.

Abstract: A torque wrench comprising: a hollow housing comprising an outer wall having a proximal end and a distal end, and an inner wall having a proximal end and a distal end, the inner wall being spaced from the outer wall so as to provide a gap therebetween, the proximal end of the outer wall being connected to the proximal end of the inner wall, and the distal end of the outer wall being configured to engage a workpiece housing; and a mechanical multiplier for disposition within the inner wall of the hollow housing, the mechanical multiplier comprising a torque input shaft and a torque output shaft, the mechanical multiplier being connected to the inner wall of the hollow housing by a loose, non-binding connection, and the torque output shaft being configured to engage a workpiece fastener.

Abstract: A torque wrench comprising: a hollow housing comprising an outer wall having a proximal end and a distal end, and an inner wall having a proximal end and a distal end, the inner wall being spaced from the outer wall so as to provide a gap therebetween, the proximal end of the outer wall being connected to the proximal end of the inner wall, and the distal end of the outer wall being configured to engage a workpiece housing; and a mechanical multiplier for disposition within the inner wall of the hollow housing, the mechanical multiplier comprising a torque input shaft and a torque output shaft, the mechanical multiplier being connected to the inner wall of the hollow housing by a loose, non-binding connection, and the torque output shaft being configured to engage a workpiece fastener.

Abstract: A torque wrench in which large torquing forces are applied to a workpiece by a ratchet and pawl mechanism allows the workpiece to be pretightened before final tightening by the wrench and includes an adapter assembly for transmitting torquing forces delivered independently of the pawl to the ratchet. The adapter assembly, which may be adapted for use with any ratcheting torque wrench, comprises an adapter member which is interlockingly received at one end within an axial opening of a ratchet gear and which includes at its other end a central aperture, a male extension, or a combination of the two for coupling to an external torque transmitting device such as an open ended wrench or an air powered wrench. Additional transition members are optionally provided to adapt the adapter member for use with commercially available torque transmitting devices.

Abstract: A torque wrench in which the torquing forces are applied to the article torqued equally and oppositely in a diametrically opposed manner. The body of the wrench comprises a two-part metal frame which permits the wrench to be significantly lighter than prior art wrenches. The applied forces may be provided by at least four hydraulic cylinders mounted in a frame, equally spaced about a central opening in which the article to be torqued is gripped. The fluid power cylinders apply force to the legs of a rotatable drive means which, in turn, rotates the member torqued. In order to provide rotation in both directions, each cylinder of the wrench is pivotable to permit the drive means to be selectively rotated in opposite directions.