Patent GB-246813-A (GB)
Title: Improvements in mining machines
IPC: E21C31/00
Filed: 1926-01-05
Abstract: 246,813. Sullivan Machinery Co., (Assignees of Holmes, M. P.). Feb. 2, 1925, [Convention date]. Coal-cutting machines.-A coalcutting machine is rotatable about its longitudinal axis on a truck, means being also provided to raise the machine or to tilt it longitudinally relatively to the truck base. The motor section 7 of the machine is connected to a section 6 carrying cutter-drive mechanism and to a section 8 containing propulsion &c. mechanism by cylindrical members 9, 10 resting in brackets 14, 15, connecting side members 17, 18, the brackets carrying clamping members 19 which hold the machine in adjusted position; the brackets 14, 15 are pivotally supported on arms 25, 26 carried by truck axles 28, 29. Cutter-chain driving mechanism. - The frame section 7 contains a reversible electric motor, the motor shaft having a forward extension 40, Figs. 3 and 5, carrying a pinion 46 aligned with a pinion 51 on a stub shaft 50; the pinions 46, 51 may be connected by a slidable internally-toothed gear 53 to drive bevel gears 71, 72 and spur gears 74, 75, the sliding gear 53 being controlled by cam means from either side of the machine. The sleeve 76 of the gear 75 is connected by a semi-permanent clutch 93<1> to a sleeve 93 and a slidable internally-toothed sleeve 96 is adapted to connect pinions 95, 92 on the sleeve 93 and sprocket shaft 78 to drive the sprocket 85 which engages the cutter chain; the sliding-sleeve 96 is controlled by a pivoted yoke 96<1> operated through a crank by a handle 103. Cutter-jib slueing-mechanism.-The cutter-jib 83, Figs. 3 and 5, is secured to a large spur gear 131 rotatably supported on a plate 135 and engaged by a pinion 130 driven by worm gearing 121, 123 from a transverse shaft 113; the shaft 113 is driven from the spur gear 75 either at slow speed through a pinion 105, worm gear 107 and a disc clutch controlled by a hand-wheel 119; or oppositely and at high speed by a pinion 137, worm gearing 139 and a disc clutch controlled by a hand-wheel 140. Spaced friction devices 142 surround the shaft 113 to prevent unintentional rotation of the jib-slueing gear. Truck-propelling mechanism.-A rear extension 152, Fig. 6, of the motor shaft drives a shaft 181 through change-speed gearing 205 arranged as in Specification 244,694 and controlled by an internally-toothed hand-wheel 220 and pinion 218. The shaft 181, through reversing bevel-gearing 189, drives a transverse shaft 226 which, through chain-gearing drives shafts 240, 247 supported in the frame brackets 14, 15, the shafts 240, 247 driving the truck axles through gears 248, 250, 253, Fig. 12. The shaft 226 has a band-brake 259 operated by a lever 260, Fig. 1, to control movements of the truck. Machine-rotating gear.-The machine is rotated about its longitudinal axis by connecting the shaft 181 of the propelling mechanism by means of a sliding gear 261, Fig. 6, to a gear 267, Fig. 13, engaging a curved rack 269 secured to the frame members 17, 18. The rack 269 may be a complete circle. Machine elevating and tilting gear.-Segmental worm gears 271, 272, Fig. 11, are fixed to the arms 25, 26 supported on the wheel axles, and engage opposed worm threads 276, 277 on a shaft 278 slidably supported by the frame member 18. The arms 25, 26 are rocked about the axles to raise or lower the machine, by moving the shaft 278 longitudinally by means of a pinion 283 engaging a rack 281 on the shaft, the pinion 283 being driven through worm gearing either by hand or from shaft 226, Fig. 6, through a clutch 286. To tilt the machine, the shaft 278 is rotated by means of a tommy-bar &c. engaging one of the circumferentially and longitudinally spaced apertures 290, Fig. 6, in the shaft. Friction. clamping means hold the shaft in adjusted position. The machine frame is counterbalanced by means of coiled springs 298, Figs. 3 and 12, surrounding the shafts 240, 247. Motor accessories.-The motor is controlled by a handle 324 and is supplied with current through cables 303, 304, Fig. 1, with an interposed fusebox, the cable 304 being wound on a reel 306 driven from the shaft 226 by a belt 311; the belt is tightened by an idler pulley 313 carried by a pivoted bracket 315, a spring 320 tending to hold the pulley in inoperative position, while a lever 317 with a spring-pressed lock 318 holds the pulley is operative position. Rolls 323 guide the cable 304.