Patent ID: 7063171

Claim:
A hand held motor-driven rotary tool, comprising: an electric motor; a rotary tool driven by the motor; a housing for housing the motor and for gripping by an operator of the tool; a torque setting and automatic stopping device for detecting torque load applied to the rotary tool by engagement of the rotary tool with a workpiece and for stopping drive of the rotary tool when the torque load reaches a predetermined value; and a means for preventing injury to said operator of the rotary tool from low-temperature burn; said means comprising: a temperature sensor on the housing for sensing predetermined temperature of the housing, said temperature being within a range of 45° C. to 65° C.; and a power shutdown device operatively connected to the temperature sensor for shutting down power to said electric motor in response to sensing by the temperature sensor of a temperature of the housing within a predetermined range of 45° C. to 65° C.