Patent GB-191012472-A (GB)
Title: Improvements relating to the Dressing of Stone.
Inventor: WOODS MICHAEL
IPC: B24B7/22
Filed: 1910-05-23
Granted: 1911-05-23
Abstract: 12,472. Woods, M., Gilbert, G. W., and Little, J. May 23. Dressing; tools; workholders. - For dressing stone, a rapidly - rotating tool cuts the length of the stone at high speed and, after each cut, is moved sideways until the whole area has been treated, whereupon the tool is moved inwards and treats the same area again. In the apparatus shown in Figs. 1, 4, and 7, the stone-carrying truck 6 is reciprocated by a rope 25, which passes over stationary pulleys 21 and over pulleys 20 on a cross - head 19, which is reciprocated by means of opposed hydraulic rams 16 having tappet-operated valves. The stone is adjusted by rams 10, and is secured by means of wedges and bolts. Slideways 32. 34, 36 carry two - part slides 53 in which are mounted dressing - tools 57, which are rotated by wheels 58 in gear with internally and externally toothed wheels mounted in the slides, the internal teeth of these wheels being in gear with pinions slidably mounted on shafts 41, 44, 50 driven by bevel-gearng from the main driving- shaft 38. Each slide 53 has on it a worm-wheel segment 65 and a loosely mounted collar 68 carrying a worm 72, the collar being held against rotation on the slideway. When ratchetlevers 78 strike tappets 83, they act through bevel-gearing and the worm gearing 72, 65 to rotate the slide about the slideway and so feed the tool inwards. A hand-wheel may also be employed for this purpose. A second tool 86, comprising disks rotated on contact with the stone, may be provided. Each slide is side-fed by hydraulic rams comprising opposed cylinders 88 and a plunger rod 90. Ropes pass from each cylinder 88, over pulleys 92 on the rod 90 and over stationary pulleys to the slides. Two-way valves 99 control communication from the cylinders 88 to three-way valves 102, which control communication with the inlet pipe 103 and exhaust pipe 104. At the end of the movement of the truck 6 in either direction, a roller tappet 15 on the truck engages a pivoted tappet plate 108, whose inner end is normally depressed bv weights or the like. The tappet plate is tilted, and acts through segmental racks and systems of gearing to move three connecting-rods 101 controlling the valves 99 of each of the side-feed rams. The cylinders 88 are thus opened to the valves 102, and through these, one cylinder is open to exhaust and the other to the inlet. The rod 90 is therefore moved, and the tools are sidefed to make new impressions on the reverse stroke. After side-feeding over the whole surface, tappets on the slides 53 strike tappets 107 on connecting-rods 106, which turn the valves 102. Side-feeding is then given in the reverse direction. In the apparatus shown in Figs. 13 and 19, the tools are reciprocated and the stone is stationary. A rope 223, driven from a belt pulley 203, passes over pulleys 205, 207 on the machine framing and over pulleys 219, 220 on a traveller 215 running on the framing, and acts through bevel-gearing 221, 224 and worm gearing 230, 231, to drive the traveller 215. The motion of the traveller is reversed when stops 209 actuate connected clutch levers 227 controlling clutches 226. The traveller has a cross beam 216, on which slide two brackets 232 having slides 251 carrying dressing-tools 253 driven through belts and pulleys 249, 250, 254 from a drum on the shaft of the pulley 219. As the traveller reciprocates, stops 210, 211 strike ratchet levers 270 and through gearing 267, 266, a shaft 265 and gearing 272, 273, 259 rotate a screw 257 engaging a nut 256 on each slide 251 and so side-feed the tools. At the end of the side-feed motion, each slide strikes one of two collars 261 on rods 260, and, through a bell-crank lever 262 and a rod 278, moves a ratchet-lever 240, which, through bevel-gearing rotates a nut 234 engaging a screw 241, thus infeeding the brackets 232 and tools to the work, and also through levers 276 moves clutches 274, 275 to reverse the direction of side-feeding. The cross-beam 216 also carries a slide 280 carrying a third tool 284 which is side-fed by the shaft 265 rotating a nut 285 through gearing 296, 298, 302, 286. At the ends of the side-feed, connected clutch levers 300 strike stops 303 and actuate clutches 297, 299 to reverse the direction of side-feeding, and also, through a rod 295, a double pawl, a wheel 293, and a worm 291 engaging a segmental rack, move a yoke 289 connected to circular bearings in which the tool 284 is eccentrically mounted, the tool thus being in-fed. The ends of the in-feeding screws 241 may engage formers to obtain any required surface on the stone. The stone-carrying truck 305 is fixed to the plunger of an hydraulic ram 307 which plunger may be rotated by worm gearing to obtain round stones. When polishing stones, the in-feed gears are disengaged. The machine may have direct drives, and may be modified to obtain pillars, cones, pyramids, mouldings, &c.