| 摘要 |
607,188. Work-holders. PARNET, A. Feb. 1, 1946, No. 3228. Convention date, April 4, 1941. [Class 83 (iii)] [Also in Group XX] The spindle A, Fig. 1, of a work-holder is clamped at C to the base member B, whilst a coaxial arm D is moved through a desired angle by the interposition of slip gauges or the like H between contact surfaces F, G on the arm D and base member B respectively. The spindle A is then clamped to the arm D, the clamp C released, the slip gauge H removed and the arm D and spindle A rotated together through the desired angle. As shown in Fig. 3, the spindle 1 is clamped to a fixed sleeve 4 by tapered surfaces 3 when a nut 5 threaded on the sleeve 4 is rotated by a worm 6 with a handle (not shown). The nut 5 transmits its axial movement via push-rods 8 to a sleeve 9 which is keyed on the shaft 1 and forms a bearing for the arm 11. The latter may be clamped to the sleeve 9 by operation of the cam lever 13. Semi-cylindrical contact surfaces 14 are mounted in semi-cylindrical bearings in the arm 11 and' in an arm 2<SP>1</SP> fixed to the base 2. To enable an angular move-. ment to be repeated the arm 2<SP>1</SP> pivotally supports a rod on which a slide may be clamped at a position corresponding to the desired angle. The arm 11 may then be repeatedly moved from a position in which it contacts the arm 2<SP>1</SP> to one in which it engages the slide by means of a removable locking pin, the clamps 3 and 13 being operated so that the spindle 1 makes a step-by-step movement in one direction only. The end positions of the arm 11 are controlled by a feeler gauge 21 on the arm 2<SP>1</SP> and a feeler gauge (not shown) on the slide. The base 2 may itself be mounted for angular adjustment by similar means about an axis perpendicular to the spindle 1. |
