Patent GB-249163-A (GB)
Title: Improvement in mining machines
IPC: E21C29/10
Filed: 1926-03-15
Abstract: 249,163. Sullivan Machinery Co., (Assignees of Holmes, M. P.). March 14, 1925, [Convention date]. Coal - cutting machines have a feedoperating member rotatable on a longitudinal axis and a worm gear disposed coaxially therewith. As shown in a room and pillar machine which is invertible for use either as an undercutter or an overcutter, the machine frame comprises a motor section 6 and a gearing section 7 connected together and to a bed section 5 to which is rigidly secured a cutter bar 9 around which a cutter chain 10 moves. The rear end of the motor shaft carries a pinion 18, Figs. 7 and 11, driving a stub shaft 27 which drives a bevel gear 32 keyed to aligned shafts 35, 36; the shaft 36, through gears 41, 42, drives a shaft 44 which may be connected by a toothed slidable member 60 to a sprocket 57 to drive the cutter chain. The slidable member 60 is controlled by a yoke 68 pivoted at 64 and connected by a link 66 to a slotted operating member 73 having lugs engagable on either side of lugs 79 to hold the member 60 in or out of engagement. The shaft 35 carries a worm 87 engaging worm wheels 88, 89 loose on parallel shafts 95 and containing disc clutches through which they may drive the shafts 95 at high speed and thereby, through pinions 111, planet wheels 112 engaging the pinions 111 and fixed internal gears 99, and spiders 116, rotate shafts 117 carrying loose feed-chain engaging sprockets 14, 15 which may be engaged with the shafts by slidable internally-toothed clutch members 127. The ,shaft 44 carries a slower worm 131 engaging a further pair of worm wheels 132, 133 loose on the shafts 95 and containing disc clutches through which they may drive, the shafts 95, and thereby the feed sprockets 14, 15, at low speed. The clutches in the worm wheels 89, 133 are controlled by yokes 148, 149, Fig. 10, pivoted to a hub 155 and pressed by a spring 174 towards stops 170, 171 on the hub, the latter being fixed to a sleeve 158 connected to a control handle 166, Figs. 1 and 7. the clutches in the worm wheels 88, 132 are controlled by yokes similarly carried by a hub which is connected to a shaft 157 within the sleeve 158 and ccnnected to a control handle 167. The handles 166, 167 may be fixed at either end of the sleeve 158 and shaft 157 and are provided with spring-pressed locking-pins engaging apertures 169 to hold them in adjusted position. Aligned pairs of guide sprockets 204, 205, 210 are provided for the feed chain at the rear of the machine and further guide sprockets 189, 196 at each side of the machine; the sprockets 189 are carried by arms 186 pivoted on bosses 185, lugs 191 and stops 192, 193 limiting the movement, while the sprockets 196 are carried by brackets 199 which may be adjusted about studs 202 and held by dowels. The feed sprockets 14, 15 and the guide sprockets may be replaced by drums and pulleys, and two wire ropes may replace the chain and feed and control the machine. Slidably arranged in the part 5 of the machine frame, part circular members 215 are provided, with similar members 220 telescoping therein, stops limiting the movement; the parts 215, 220 may be pulled out from the frame and form guards covering the cutters. The forward ends of the parts 220 are connected by cross members 223, 224 engaging and supporting the cutter-bar 9, the lower cross member having a shoe 225 engaging the floor. For transport, the machine may be mounted on a truck, Fig. 17, carried by wheels or endless tracks 258; either of, or both, the shafts 117 of the feed mechanism may then be connected by the clutch sleeves 127 to members 252, 253 on the truck and thereby, through reversing gearing 254. 255, drive a shaft or shafts 256, 257 from which the truck and a cable reel 266 are driven.