| 摘要 |
1,141,703. Crank-shaft chucks. R. K. LE. BLOND MACHINE TOOL CO. 7 Feb., 1966, No. 5337/66. Headings B3B and B3T. A crank-shaft chuck comprises a rotatable body 24 with a circumferential drive 40, 42 and an anvil 28 and a jaw 34 for gripping the work, the jaw being pivotable by a chordal slide 74 moved by a screw-and-nut mechanism 48, 77 driven by input and output pinions 60, 56 meshing with a ring gear 58 carried by a frame 20 coaxial with the body 24, the arrangement being such that, if the pinion 60 is driven with the body 24 stationary, it will rotate the ring gear 58 and cause the output pinion 56 to operate the jaw, but, if the body 24 is rotated by the circumferential drive and the pinion 60 idles, the output pinion 56 carries the ring gear 58 round with the body. The nut 48 carries a bevel gear 52 meshing with a bevel gear 54 on a shaft journalled in the body 24 and carrying the pinion 56. The nut is therefore rotated when the pinion 60 is driven through a clutch 66 and a motor 64. Crank-shafts may be loaded automatically. |
