Patent ID: 7469619

Claim:
An electronic torque wrench for driving a workpiece, comprising: a wrench body having a handle end and a wrench head receiving end including a socket formed therein; a wrench head having a workpiece receiving end and a mounting end including a mounting boss, said mounting boss of said mounting end being removably received by said socket of said wrench head receiving end; a user interface having a processor and a display; a wrench head sensing device carried by said wrench head receiving end; an electrical connection between said wrench head sensing device and said processor; and wherein said wrench head sensing device includes a plurality of pressure switches and said mounting boss includes at least one projection, each said projection for activating one of said pressure switches when said mounting boss is inserted in said socket; wherein said wrench head sensing device sends an electrical signal to said processor indicating the presence of said wrench head on said wrench head receiving end.