Patent GB-191406043-A (GB)
Title: Improvements in Surface Grinding Machines.
Inventor: NORTON CHARLES HOTCHKISS
IPC: B24B7/02
Filed: 1914-03-10
Granted: 1915-03-10
Abstract: 6043. Norton, C. H. March 10. Disk and wheel apparatus.-A surface-grinding machine comprises a bed 2 carrying a reciprocating work-table 91 driven by belting from a countershaft 11 which is driven by a motor A. The grinding-wheel 67 is supported, so as to be adapted for horizontal adjustment laterally of the machine, by a slide 62, this slide being adjustable, either by power or by hand, by means of a screw 100, up and down ways 60 on a vertical standard 9. The grinding- wheel is driven from the countershaft through the medium of a long pulley 71 supported on a member 69, pivoted at one end to a bracket 68 carried bv the slide 62, and at the other end to an adjustable spring-supported rod 72; this arrangement, in conjunction with driving-belts 78, 76 and a belt-tightener 77 and an idler pulley 80, allows of the vertical movement of the slide and the horizontal movement of the grindstone. The work-table is driven by means of a rack 26 thereon engaged by a spur-wheel 25 mounted on a shaft 24 driven by worm-gears from the countershaft, and the reversal of the movement of the table at the ends of its strokes is brought about by crossed and open belts, adapted to be moved on to fast and loose pulleys 17, 15, 16 by means of a belt-shifter 51 operated by a rod 50, the belt-shifter having wheels 52, running on guide-rods 53, and belt-forks 54 for engaging the belts. The rod 50 is operated at the end of each stroke of the table by a rod 32, guided in an apron 29 on the front of the machine, and having secured thereto a slide 34 with catches 38 at its ends. Loosely mounted on the rod 32 are collars 35 and collars 31<a> with springs 36 between them, and between the two collars 31<a> is a sleeve 31 engaged by the lower end of a reversing-lever 28; latches 39 pivoted to the apron may engage the catches 38. The upper end of the reversing - lever is engaged at the end of each stroke of the table by dogs thereon, and, being swung over thereby, moves the sleeve 31 to compress one or other of the springs 36 until the end of one of the arms 44 of a lever 40, movable with the reversing- lever, lifts the latch 39 and allows the spring to throw over the slider 34, thereby shifting the belts. The lever 40 is pivoted on the same pin 41 as the reversing-lever; it may be raised to lift the latches 39 and thereby prevent automatic reversal of the table, being maintained either up or down by a plunger 43. Hand operation of the reverse may be brought about by means of handles 28<a> on the reversing-lever; a locking-device is provided to lock the reversing- lever when desired. The grinding - wheel slide is raised or lowered by power by means of a motor C carried by the standard and adapted to be clutched to drive a shaft 133 on which is a slidable pinion 134, which may be moved by a handle 136 to be in or out of engagement with an external gear 110. This gear is formed on a casing 109, having an internal gear 111, and keyed to a sleeve 108 having integral therewith a bevel-gear 106 adapted to drive, through a shaft 104, the screw 100. Hand operation of the grinding - wheel slide is effected by means of a hand-wheel 114 loose on the shaft 107 carrying the gear 106, but adapted to be secured thereto by a screw 119 and plate 113 when slow operation of the slide is desired, this slow operation being performed by a handle 124 and an index-plate 126 secured to a pinion 123 in gear with the internal gear 111. A member 142, Fig. 12, is provided pivoted at 143, and in one position prevents the pinion 134 from being moved to gear with the gear 110, at the same time preventing rotation of the hand-wheel 114, and in the other position allowing both these movements to take place. A pump delivers water from a tank 85 to the grinder; the worktable has side flanges and an end flange 92 to prevent splashing of the water and to return it to the tank. Plates 96 protect the ways of the bed from the water. Specifications 19,590/14 and 19,591/14 are referred to.