| 摘要 |
602,345. Machine framings ; work-holders. BERTHIEZ, C. W. May 10, 1945, No. 11709. Convention date, Dec. 16, 1943. [Class 83 (iii)] A device for locking a slidable member of a machine tool to its slideway is characterised by the provision of a system of shoes through which frictional reactions are applied on two opposite parallel surfaces of the slidable member and simultaneously on opposite corresponding surfaces of the slideway so that a portion of the latter and of the slidable member are pressed between the shoes. Pressure fluid derived from an electrically driven pump is fed to one or more clamping points, each comprising a cylinder 1 and double-acting piston 4, the latter being cut-away at the centre for a gudgeon pin 5 connected by blocks 10, Fig. 3, to lever arms 9. The other ends of the levers are provided with integral eccentric portions through which a pin 12 passes, linking them to the head of a draw-bolt 11. Shoes 14, 17, provided with friction linings 15, 18, respectively, are arranged on the draw-bolt to embrace corresponding adjacent surfaces of the slide (which carries the clamping device) and the bed. Adjustment of the shoes is made through the nuts 16. Reciprocation of the piston 4 thus effects clamping and unclamping of the slide. A set pin 6 extending from the gudgeon pin in a direction perpendicular to the piston indicates the position of the latter and also operates switches a, b for controlling the pump motor. The clamping shoes may, alternatively, be operated entirely mechanically, for example by a cam arrangement. |
