| 摘要 |
893,512. Making chucks. JACOBS MANUFACTURING CO. Oct. 17, 1960 [Nov. 20, 1959], No. 35478/60. Classes 83 (2) and 83 (3). [Also in Group XXV] A chuck comprises a body 10 having an internal divergent cam surface 12 to receive a collet 14, a pressure member 18 movable axially to engage the collet, and gearing 42 on the body for simultaneously rotating a plurality of screws 36 connecting the member and the body. The collet has hard metal jaws connected by rubber 13. The body 10 is attached by screws 55 to a mounting member 56. The gear 42 meshes with teeth on the heads of the screws 36 and is rotated by a plastic hand wheel 58 to move the member 18 axially and clamp a workpiece in the chuck. Further tightening of the chuck may be produced by rotating one or more of the screws 36 individually by hexagon spanners inserted in sockets in the screw-heads. To assemble the chuck, a ring 75, Fig. 9, is clamped evenly between the member 18 and the body 10 by the screws 36 and the gear 42 is then meshed with the screw-heads. To do this, the heads may have to be turned slightly to ensure correct meshing, and an error is introduced. The ring 75 is therefore removed and the member 18 reclamped to the body with a number of resilient blocks 82 interposed between them. The surface 76 of the member 18 is then ground truly perpendicular to the chuck axis by a wheel 79. To ensure that, whenever the member 18 has been removed to replace a collet, it is replaced in the same position, the threads in the member are all tapped simultaneously. Washers or ball bearings may be placed between the heads of the screws 36 and the body 10 to reduce friction. The member 18 may be made in two parts, the rear part being of soft metal which is machined true before the front part is attached. The screw-threads in the member 18 may be formed in adjustable bushes 90, Fig. 11, which are secured by adhesive when the chuck parts have been correctly assembled. |
