Patent GB-190708193-A (GB)
Title: A Headstock for Lathes
Inventor: SCHELLENBACH WILLIAM LORRAINE
Filed: 1907-04-09
Granted: 1907-11-28
Abstract: 8193. Schellenbach, W. L. April 9. Variable-speed gearing.- Relates to driving- gearing, including clutches, for a lathe. The driving-pulley h, Fig. 6, is mounted on a sleeve k loose on the spindle and carrying a gear l and two sliding gears m, n controlled by a fork having rack-and-pinion connexion with a handwheel, which also has a rack - and - pinion connexion with a finger moving over a speed-gauge table. In each of its four positions the hand wheel is pulled axially by a spring so that a pin it carries enters a notch in the head-stock, thus locking either the gear m in clutch with a sleeve r, one of the gears m, n in line with a gear 33, or both gears m, n out of line with the gear 33 which can then engage the gear l. The gear 33, Fig. 8, and another like gear 38, or two sets of telescoping gears, are mounted on shafts 31 carried in a tumbler 18 and drive an internal gear 29 which drives the spindle e either through the gears 26, 1 and clutch z, or the gears 23, 28. The tumbler is rotated about the axis of the pinion 23 to bring either gear 33, 38 into engagement with one of the gears l, m, n by a handle 67 working in a slot 62, the sides of the slot being notched and a sleeve 65 on the handle being spring-pulled and provided with pins for locking the tumbler in its several positions. The spindle e can be driven direct through the clutches u, z and the sleeves r, v, or through the clutch u, sleeves r, v, and gears 1, 26, 23, 28. The speed-table is divided into rows of different cutting-speeds and into four columns. The first column is divided into two parts, one giving the diameter of the work corresponding to the cutting-speed when the clutch z is engaged, the other when the clutch is disengaged. The other three columns have a third part which states the size of the change-gear 33 to be used. In order that the clutch z and pinion 23 may not be in gear simultaneously, they are both operated from the same hand-wheel 67 which has a rack-and-pinion connexion with a sleeve 43 on the reciprocating shaft 24. When the sleeve 43, Fig. 7, is moved to the left, the pinion 23 is first disengaged, the block 48 being moved to engage the clutch z after the projection 46 has passed the spring catch 53 and reached the part 52 of the block. On the return of the sleeve 43 the clutch z is disengaged, then the catch 53 is withdrawn by a bevel-ended pin 60 to permit of further motion of the sleeve without the block 48. The lead-screw 142 is driven from a pinion 97 on the spindle e and through one or two idle-wheels 112 on a plate 109 oscillated by a crank-pin and hand-wheel 116, and gear 103, Fig. 13. The gear 101 or either of the telescoping gears 102, 103 engages a change-gear 122 which drives the screw 142 through the gears 123, 120 and either the gear 141 and clutch 145 or the gears 140, 148, a collar 152 on the clutch-sleeve 145 is arranged to be over one or other of the two columns of a pitch-gauge table 149, which gives a list of drivers 97 and change-gears 122 for various pitches of threads. The spare change-wheels are kept in a box 127, the lid pivot 130 of which is threaded at its end to draw the clamp 132 up to the rotatable plate 118 when the lid is closed.