| 摘要 |
429,919. Chucks. CONE, F. L., 129, State Street, Windsor, Vermont, U.S.A. Sept. 1, 1933, No. 24352. Convention date, May 15. [Class 83 (iii)] In a chuck for gripping bar-stock so that both ends are exposed for machining, which is particularly although not exclusively adapted for use in a multiple-spindle turret lathe as described in Specification 411,516, a tube 50 has collets 52, 53 secured to its opposite ends and operated by relatively slidable sleeves 55, 75. A number of levers 73, preferably three, are pivoted to the sleeve 75 and act on a hardened ring 80.on the sleeve 55 so that as the levers are swung outwardly by a cone 70, the sleeves are moved axially apart to close the collets on the work. Both sleeves are slidably mounted in bearings 95 in a turret 30 so that the pressures of the two collets on the work will be equalized. The cone 70, which is splined at 61 to the sleeve 55, is moved axially by a yoke 64 engaged by a cam-operated rod 97 when the turret reaches its work-changing station, a gear wheel 60 formed integral with the cone being moved out of engagement with a driving pinion 40 as the chuck is being opened. The sleeves 55, 75 are splined together at 76 and are moved to release the collets by means of springs 85 acting between the heads of screws 87 secured to the sleeve 75 and stops 88 projecting radially from the sleeve 55. |
