| 摘要 |
A rotatable loose top tool is composed of a basic body (1) having a centre hole (18) and a loose top having a centering pin (30) that is insertable into the centre hole and includes, on one hand, a contact surface (38) that is pressable against a cylindrical support surface (33) in the centre hole, and on the other hand a clearance surface (39) that lacks contact with an internal clearance surface (35) in the centre hole. According to the invention, the clearance surface (35) of the centre hole is situated radially outside a circle inscribed along the support surface (33) at the same time as the clearance surface (39) of the centering pin (30) is at least partly situated radially outside a circle circumscribed along the contact surface (39). In such a way, any risk of incorrect mounting of the loose top is obviated. In addition to the assembled tool, the invention relates to a loose top as well as a basic body for the tool. |
