Patent ID: 7845428

Claim:
A rotating tool having a rotating main shaft, in which the rotating main shaft is provided with a machine tool retaining hole having a cross-sectional shape that substantially matches a base part of a driver bit, drill bit, or other machine tool having a polygonal cross-sectional shape that is inserted into the machine tool retaining hole, wherein the rotating tool rotates said machine tool inserted in the machine tool retaining hole by rotating said rotating main shaft and performs work; said rotating tool characterized in that a pushing mechanism is provided for rotating the machine tool with respect to the machine tool retaining hole so that the machine tool is rotationally offset from the machine tool retaining hole as viewed in cross-section while an axial center of the machine tool and an axial center of the machine tool retaining hole are aligned with each other, and for twisting and pushing the machine tool against an internal surface of said machine tool retaining hole when the machine tool is inserted in the machine tool retaining hole.