Patent GB-191406044-A (GB)
Title: Improvements relating to Cylindrical Grinding Machines.
Inventor: NORTON CHARLES HOTCHKISS
IPC: B24B47/00
Filed: 1914-03-10
Granted: 1915-03-10
Abstract: 6044. Norton, C. H. March 10. Disk and wheel apparatus. - A cylindrical grinding-machine comprises a bed A upon which is a reciprocating work-table B and a grinding- head C movable to and from the work-table, a grinding-wheel E being mounted on the head and driven by belts 119, 123 from the main shaft 10. The table is traversed to and fro by a spur-wheel 26, Fig. 7, fixed to a shaft 25 and engaging a rack 27 on the table, and the shaft is driven through a clutch 250 from a wormwheel 24, loose on the shaft, and driven by a worm 23 on a shaft 18 carrying gearing whereby it may be driven in either direction at two speeds by belting from the main shaft. Between the clutch 250 and the worm-wheel 24 is a pneumatic cushioning-device, for the reverse of the table, comprising pistons 241 carried by the chuck and inwardly projecting arms carried by the worm-wheel, the pistons sliding into airpockets 242, with adjustable ports 252, between the pistons and the arms and formed in a bearing-member 240 loose on the shaft. The workrotating drive comprises a telescopic shaft 99, Fig. 3, driven from the main shaft 10 by bevelgearing 98, the shaft 99 driving, through a shaft 101 and belting, a cone-pulley 102, Fig. 2, from which a belt drives the work-spindle 104; a clutch 37 operated by a rod 36 serves to throw the work drive in or out independently of the power shaft; a way 87 for a steady rest is provided on the work-table. The work-table may be traversed either by a hand-wheel 28 and a pinion 30 loose on the shaft 25, or by power by means of the worm-wheel 24, and mechanism is provided whereby: (a) the action of throwing out the automatic table drive also stops the work drive, (b) the work drive can be thrown in while the table remains operable by hand only, and (c) the work drive can be thrown in by the action of throwing in the automatic table drive, all these operations being independent of the power shaft. This mechanism comprises a double clutch 32 normally pressed out to engage a clutch 31 on the pinion 30 by a spring 33<a> but adapted to engage, when depressed by a handle 33, the clutch 250. A second handle 34 is provided, secured to a shaft 34<a> with a crank 34<b> at its end secured to the clutch-rod 36, and this handle also carries a cam 35, Fig. 10, slidable behind the lever 33. When the handle 34 is in the mean position the clutch 37 is out and the clutch 32 is held, through the cam 35 and lever 33, in its neutral position, and both work drive and automatic table drive are thrown out. If now the right-hand end of the lever 34 be lowered, the spring 33<a> forces the clutch 32 out to engage the clutch 31, so that the table is operable only by hand, and at the same time, owing to rotation of the shaft 34<a> and lever 34<b>, the clutch-rod 36 is raised and the work drive is thrown in. If, however, the right-hand end of the lever 34 be raised from its mean position, the cam forces the clutch 32 into engagement with the clutch 250 and, the rod 36 being again raised, both the work drive and the automatic table drive are thrown in. A locking-device 38 prevents, when desired, the automatic table drive from being thrown in. The table is reversed at the ends of its strokes by dogs thereon which engage a reversing-lever, thereby operating a reversing - clutch. A tank 112 for containing water to be supplied at the grinding - point by a pump D driven by belt 106, is pivotally mounted on the machine frame. Specifications 6043/14, 18,637/14, and 18,639/14 are referred to.