Patent ID: 7836802

Claim:
A centrifugal electric impact wrench using an electric driving motor, which is rotated by electricity supplied from an electric power source, as a power source, the electric impact wrench comprising: a sun gear coupled to a rotation shaft of the electric driving motor; a plurality of planetary gears including first gear engaged with the sun gear, and second gear having a small diameter than the first gear; an output gear engaged with the second gear of the planetary gear; an inertia wheel rotated by rotation force transmitted from the output gear; a spindle rotatably connected to a front portion of the inertia wheel and provided with a connector at a side of the spindle; and a blow body hitting the connector when centrifugal force caused by the rotation of the inertia wheel increases over a predetermined extent, and returning to an initial position by means of a return spring when the centrifugal force caused by the rotation of the inertia wheel is reduced below a predetermined extent, wherein the inertia wheel has a cut portion which is cut lengthwise on an outer peripheral surface, the blow body is received in the cut portion and interposed between a plurality of connecting members, a mounting pin and connecting pin are respectively fixed to a hole of the blow body, and the blow body is installed in the cut portion so as to pivot upward and downward around a coupling pin in such a manner that a coupling pin extends through and is inserted into a hole and a coupling hole in a state that a coupling hole of the blow body coincides with the hole of the inertia wheel.