Patent ID: 7306551

Claim:
A tool exchange device, comprising: a tool, comprising first and second step portions formed in an L-shape and having vertical restriction surfaces diametrally opposing and parallel to each other and horizontal engagement surfaces directed radially outwardly from lower ends of the vertical restriction surfaces on two sides of a main body portion of the tool; a first engagement member provided on one side of a holding portion that places and holds the tool for exchange, the first engagement member having a first engagement projection piece opposing a horizontal engagement surface of the first step portion and having an end surface in abutment against a vertical restriction surface of the first step portion; a second engagement member provided on another side of the holding portion, the second engagement member having a second engagement projection piece having an intermediate part opposed to a horizontal engagement surface of the second step portion, and having end surfaces formed on sides of the intermediate part in abutment against portions of the main body portion formed on sides of the second step portion; and a moving unit which moves the first and second engagement members between an engagement position and a withdrawal position with respect to the step portions.