Zero-point clamping device

A zero-point clamping device (1) for centered locking of an object (2) with repeat accuracy, the zero-point clamping device comprising:

• a housing (4),
• a receiving opening (5) worked into the housing (4), which has a centering axis (6) with which the axis of symmetry (2′ or 3′) of the object (2) or the carrier part (3) is coaxially aligned during the clamping process,
• at least two clamping slides (7, 8 or 9), each of which is mounted axially displaceably in a bore (10) provided in the housing (4) and which open into the receiving opening (5) during the clamped condition and thereby act on the object (2) or the carrier part (3) and secure the object (2) or the carrier part (3), and
• an actuating element (11) which is rotatably mounted in the housing (4) and by means of which the clamping slides (7, 8, 9) can be moved, one axis of rotation (12) of the actuating element (11) running tangentially and at a distance from the receiving opening (5),
• characterized in that,
• two spaced-apart threads (13, 14) are incorporated in the actuating element (11), the respective threads (13, 14) of which have identical pitches and are designed to be inclined in opposite directions with respect to one another,
• a drive pin (15, 16) is inserted in each thread (13, 14), this drive pin (15, 16) being in a driving operative connection with the respective thread (13 or 14) in such a way that the drive pins (15, 16) can be moved along the axis of rotation (12) of the actuating element (11) by means of the rotation of the actuating element (11),
• at least two drive segments (21, 22 or 23) are mounted in a floating arrangement in the housing (4) and extend in an arc around the centering axis (6) of the receiving opening (5), and
• two of the drive segments (21, 22) are coupled in a driving arrangement to the actuating element (11) via one of the respective drive pins (15, 16), that a respective pivot pin (17, 18) is provided between the two drive segments (21, 22) connected to the actuating element (11) and the drive segment (21, 22 or 23) arranged adjacent thereto to form a swivel joint, and that each clamping slide (7, 8, 9) is connected to one of the drive segments (21, 22, 23).