Abstract: The present invention is directed to a torque wrench wherein a head comprises an engaging member capable of being coupled, antirotationally, with a screw or the like. A handle lever is movable within limits relative to the engaging member and a load sensor is provided between the engaging member and the handle lever and controls an indicating means. The load sensor according to the present invention is a piezoelectric member fitted with electrodes connected with the input of an electric amplifier which is fed by a battery housed in the handle lever. The electric amplifier controls an electronic indicator which indicates the torque applied to a screw or the like.

Abstract: A torque-testing instrument is disclosed for testing tools such as spanners, wrenches and the like. The instrument comprises a measuring assembly, a reading device and means for transmitting measured values from the measuring instrument to the reading device. The tool is fastened in the testing instrument and subjected to a torque effect. A load cell produces an electrical charge signal constituting measured values proportional to the torque effect being transmitted within the instrument. The load cell comprises a piezoelectric load sensing element electrically connected to an electronic amplifier for the reading device.

Abstract: The pincers comprise two pincer legs pivotally mounted on a pivot pin about a common pivotal axis. Each leg has a handgrip portion and a head portion. The head portions extend toward each other in open arches and have cutting edges which meet in a cutting relationship. The head portions of the pincer legs are formed asymmetrically with respect to each other. A pincer head axis extends along a line connecting the center of the pivot pin with the meeting point of the cutting edges. A longitudinal medial axis extends throughout the length of the pincers between the handgrip portions. The head axis intersects the medial axis at an acute angle.