Patent ID: 7096747

Claim:
A hand tool with twisting force measuring functions comprising: a driving portion having a driving head for screwing a screwing elements; a handle connected to the driving portion; the handle including a first lateral side and a second lateral side adjacent to the first lateral side; four strain gauges installed in the first lateral side; three strain gauges installed in the second lateral side; an integrating element installed on the handle for calculating twisting forces of the tool body by measuring data from the strain gauges of the first lateral side and the second lateral side; wherein the strain gauges in the second lateral side is connected with other circuit element as a Wheaston Bridge for measuring twisting force of the hand tool wherein the strain gauges in the first lateral side is connected with other circuit element as a Wheaston Bridge for measuring twisting force of the hand tool; wherein the Wheaston bridge of the first lateral side is connected across one element of the Wheaston bridge of the second lateral side; wherein the integrating element is connected to all the strain gauges through conductive wires; wherein a display and an adjusting button are installed on the integrating element; the display serves for displaying the values of the twisting forces calculated by the integrating element from the measured values of the strain gauges; the adjusting button has the functions of reset, calibration and unit-conversion of the values of twisting forces; and wherein the driving head is a spanner with an opened end and another end of the spanner has a ring so as to form a ring spanner.