| 摘要 |
The spindle (1) is provided at its spindle head (1a) with a frustoconical receiving bore (3a, 3b) for receiving a taper shank of a conventional tool holder and an annular end face (4) which is disposed around the receiving bore (3a, 3b). In the region of the frustoconical receiving bore (3a, 3b), the spindle head (1a) is provided with a cylindrical fitting bore (5) for selectively receiving a cylindrical fitting spigot portion (12) of a tool holder (11), the diameter (D) of the cylindrical fitting bore being somewhat smaller than the largest diameter (D1) of the frustoconical receiving bore (3a, 3b) and the axial length (L) thereof, as measured from the end face (4), being shorter than the axial length (L1) of the frustoconical receiving bore (3a, 3b). In the region of the cylindrical fitting bore (5), the spindle head (1a) has two diametrically oppositely disposed, radially extending female screwthreads (7, 8) each having a respective clamping screw (9, 10) provided with a conical projection (9a) or depression (10a). A clamping pin (14) is radially displaceable in a transverse bore (13) in the fitting spigot portion (12) and is provided at each of its two ends with a conical depression (14a) projection (14a) respectively co-operating with the clamping screws (9, 10). The spacing (a1) of the axis (A1) of the female screwthreads (7, 8) from the end face (4) is somewhat larger than the spacing (a2) of the axis (A2) of the transverse bore (13) from an annular surface (16) which extends around the fitting spigot portion (12) so that, when one of the clamping screws (9, 10) is tightened it acts on the clamping pin (14) so as to press the annular surface (16) and the end face (4) towards each other. <IMAGE> |
