Patent ID: 6206157
Filing Date: 2001-03-27
Classification: B23Q,F16H,Y10T

Abstract:
A rotary drive for a tool holding device (3) comprising:a shaft (1) adapted to bear the holding device (3);a first hollow shaft (7) arranged concentrically over the shaft (1);the first hollow shaft adapted to be driven by means of a drive device;an engageable and disengageable coupling (15, 16) arranged between the shaft (1) and the first hollow shaft (7);the coupling operated by relative axial movement between the shaft (1) and the first hollow shaft (7);a second hollow shaft (12) arranged between the shaft (1) and the first hollow shaft, adapted to cause the relative axial movement and to rotatably bear the shaft (1);the first hollow shaft (7) rotatably supported in a housing (5);a gripping device arranged between the first hollow shaft (7) which when the hollow shaft (7) is driven couples with the second hollow shaft (12);and wherein the first hollow shaft (7) is rotatably mounted in the housing (5) in a manner preventing axial movement when the second hollow shaft (12) axially shifts the shaft (1).