| 摘要 |
<p>A letter L-like step portions (5a, 5b) each having a vertical constraining surface (6) and a horizontal engagement surface (7) are provided on both sides of a body portion (2) of a tool (1). On one side of a holding portion (11) on which the tool (1) for exchange is placed and held, there is provided a first engagement member (13) having a first engagement projection piece (12) that is opposite an engagement surface, or one of the engagement surfaces (7), of one (5a) of the step portions (5a, 5b) and whose end surface (12a) is in contact with the constraining surface (6). On the other side of the holding portion (11), there is provided a second engagement member (15) having a second engagement projection piece (14). An intermediate portion of the second engagement projection piece (14) is opposite an engagement surface, or the other of the engagement surfaces (7), of the other (5b) of the step portions, and end surfaces (14a) at both sides of the second engagement projection piece are in contact with an outer peripheral portion of the body portion (2) at positions on both sides of the step portion (5b). The first and second engagement members (13, 15) are moved between positions of engagement and disengagement with respect to the step portions (5a, 5b).</p> |
