Patent ID: 8240393

Claim:
An electric power tool, in particular a hand-held electric power tool, having a tool housing and an electric drive motor whose speed is adjustable by means of an adjusting device, the adjusting device including a switch housing affixed to the tool housing and an adjusting element movably supported on the switch housing, a movement of the adjusting element in an actuating direction causing a change in the speed of the drive motor, wherein the adjusting element is associated with a strain measuring device that produces a measurement signal that is used to adjust the drive motor in response to a movement of the adjusting element, wherein the switch housing has an interior in which the strain measuring device is accommodated, wherein the strain measuring device includes a flexible element embodied in the form of an elongated bending spring which is accommodated within the interior of the switch housing and extends in a straight line in an unstressed state orthogonal to the actuating direction of the adjusting element, the spring having one end attached to an inner wall surface of the switch housing and an opposite free end, wherein the adjusting element is embodied in the form of a linearly movable push button secured to the switch housing via guide surfaces embodied in the form of guide grooves provided on an outside surface of the switch housing so that the push button is movable in translatory fashion, and wherein the push button has sections embodied in the form of hook-shaped sections bent laterally inward toward the guide grooves, the hook-shaped sections extending into the guide grooves and resting against the guide surfaces.