An electronic torque wrench has a hollow handle portion in which are disposed a DC motor mechanically coupled to the handle portion with a mass eccentrically mounted on its shaft, a control circuit for the motor and a battery for powering the motor and the control circuit. A strain sensor on the wrench produces an output signal when the torque applied to a workpiece equals or exceeds a predetermined torque level for causing the control circuit to actuate the motor to vibrate the handle portion a...

An electronic torque wrench includes a head portion, a handle portion connected to the head portion and having a tubular wall that defines a receiving space, a strain sensor unit disposed in the head portion, and an indicator unit disposed in the receiving space and including a rotary member having a rotatable portion, a first indicator connected to the tubular wall, and a second indicator fixed to the rotatable portion. The first and second indicators strike each other to produce a sound when t...

An electronic torque wrench includes a tubular housing having a surrounding wall confining a receiving space, a working unit having a shank portion extending axially into the receiving space and pivoted to the surrounding wall at a pivot point, a strain sensor provided in the working unit, a trip unit having at least one driven element disposed in the shank portion, and a central processor connected electrically to the strain sensor and the trip unit. The driven element is movable to a tripping ...

A tension alert hand tool comprises a driving portion being installed with a buckling unit; the buckling unit being installed with an elastic unit; a handle being formed with a receiving groove for receiving the buckling unit and the elastic unit; a surface of the handle being formed with an through hole; and a tension alarm device having a sensor switch and an alarm unit; the sensor switch being installed in the receiving groove; the alarm unit being installed in the through hole of the handle;...

An electronic torque wrench has a tubular core with elongated apertures therein which respectively removably receive user interface assembly and power assembly modules, the modules being exposed through openings in a surrounding grip sheath. A workpiece-engaging head is coupled to a beam member which may received in a tapered opening in a shim member received in an end of the tube. A sensor on the beam member is connected by wires extending to the user interface assembly, which in turn has a dis...

An electromechanical releasing torque wrench which includes an electronic controller (50) and transducers (32) or (34) to measure and actuate a release of the wrench with physical, audible and visual signals. In operation, the user sets the desired torque-release-point on the keypad (60) of the electronic controller and then attaches the wrench to a workpiece with the ratchet means which pivotally protrudes from the enclosure (20). The user tightens the workpiece, normally a threaded fastener, a...

A dynamometric wrench comprises a handle part (1) and an elongated torsion body (2) which at a first end (3) is co-rotatively connected with the handle part (1) and at the opposite end (4) has means for connecting the torsion body (2) with a screw or similar. In the region of the latter end (4), the torsion body (2) is co-rotatively connected with a socket- or ring-like part (8) which is rotatable relative to the handle part (1) when the body (2) is submitted to torsion due to it being loaded wi...

An improved combined torque limiting and part marking wrench according to the present invention includes: a torque-applying handle; a housing pivotally mounted to the handle, the housing adapted to receive a releasably mounted, replaceable, part-engaging head assembly at a second end thereof; and a part-marking mechanism mounted within the housing. The part-marking mechanism includes a marking tip which passes through a bore in the head assembly for marking a part. A mechanical linkage arm is pi...

An electromechanical releasing torque wrench which includes an electronic controller (50) and transducers (32) or (34) to measure and actuate a release of the wrench with physical, audible and visual signals. In operation, the user sets the desired torque-release-point on the keypad (60) of the electronic controller and then attaches the wrench to a workpiece with the ratchet means which pivotally protrudes from the enclosure (20). The user tightens the workpiece, normally a threaded fastener, a...

A torque applying and indicating wrench is comprised of a pawl with a torque sensing end for both ratcheting, and direct sensing of torque during application. The torque sensing end is bifurcated into a cantilevered flexing beam and an optional reference beam. The flexing beam engages one or more ratchet teeth from a ratchet wheel contained in the wrench head of an elongated tool body. Torque is then transduced and indicated either mechanically or electronically.