Patent ID: 7765898

Claim:
A rotary tool, comprising: a holding part; a mounting part formed at an end of the holding part; a holding and transmitting part received within said mounting part configured to hold a hexagonal column of a rotated body and apply rotation force thereto, the holding and transmitting part consisting of: a recessed part defining a bottom face, an inner face having a triangular shape cross section, and having a uniform shape in a depth direction, the inner face defining three flats separated by three run-off parts formed at respective corners of the triangular shape, and a plate spring having a triangular base fixed to the bottom face of the recessed part, the base having three arm portions extending from a respective corner each having a pawl at a tip end, the base and the pawls corresponding to the triangular shape cross section and the run-off parts of the recessed part respectively, wherein the pawls are configured to be moved into the run-off parts while contacting three side faces of the hexagonal column of the rotated body so as to generate spring force when the hexagonal column of the rotated body is inserted into the recessed part; and wherein the holding and transmitting part defines a hexagonal shape engaging portion defined by the three flats and the three pawls for applying great rotational force to all six side faces of the hexagonal column when the hexagonal column of the rotated body is engaged.