Patent GB-491006-A (GB)
Title: Improvements in mining machines
IPC: E21C31/00
Filed: 1936-12-18
Abstract: 491,006. Mining-machines. RICHARDS, D., and SULLIVAN MACHINERY CO. Dec. 18, 1936, No. 34811. [Class 68 (i)] [Also in Group XXIV] High-speed and low-speed transmission mechanisms, each including a friction clutch and spring clutch-loading means, are provided for driving the feed member of a mining-machine, means being provided so that the member may be driven continuously at high speed, continuously at low speed, or intermittently at low speed. Cutter-chain drive.-The motor shaft 10, Fig. 3, drives the cutter chain through bevel gears 11, 12, spur gears 14, 15, internallytoothed clutch sleeve 18, and sprocket 17. Chain-bar support.-The bar 6 supporting the cutter chain is carried by a hanger 19 journalled on bearing sleeves 21 supported by part 22 of the machine frame and a detachable flanged member 24. The hanger slides on a plate 25 and has an arcuate flange 26 engaging below the machine frame. The hanger has slots adapted to be engaged by a hook on the feed cable for angular adjustment of the bar 6. Chain-bar lock.-The hanger 19 has three radial grooves 35, either of which may be engaged by a projection 34 on a vertically sliding bolt 28 pressed by springs 33, Fig. 16, and controlled by a two-part pin 37 arranged eccentrically between handles 38 and engaging a slot 36 in the bolt. Variable-speed feed-drum drive.-The motor shaft, through pinion 43, Fig. 6, drives a highspeed spur gear 44 which, through shaft 46, Fig. 9, and reducing gear 47, 48, 50, drives a low-speed spur gear 51, the gears 44, 51 containing disc clutches 54, 55, whereby they may drive a worm 58 coaxial with the shaft 46 and engaging a worm wheel 59 on a shaft 60, Fig. 8, carrying a pinion 61 through which the haulage drum 8 is driven. Pivoted shipper yokes 62, 63 are pressed towards the respective clutches 54, 55 by intermediate springs 66 ; cams 69, 70 on a shaft 67 controlled by a handle 68 are adapted to hold both yokes in clutch-disengaging position, or to allow either yoke to apply variable loading pressure to its clutch. Intermittent drive is obtained from a worm wheel 76, Fig. 8, driven from gear 48 and driving a cam 78 acting through a lever 79, Fig. 6, and shipper yoke 63 so as intermittently to release the clutch 55 ; the lever 79 is pivoted at 80 to a lever 81 on a shaft 82 adjusted through a threaded rod 86 and a nut engaging an abutment 83 so as to vary or eliminate the intermittent drive. In another form, Fig. 22, the slipper yokes 62, 63 are controlled through adjustable screws 133 on a casing 120 containing a compressed spring 125 surrounding a rotatable rod 124 engaged by a spring-pressed plunger 144 to prevent vibration, and connected to a screw 138 engaging a nut 137 with a pin 136 engaging a cam slot; a handle 141 pivoted to the screw 138 may be engaged with the nut 134 to rotate the latter and thereby move the casing 120 to engage either yoke 62, 63, the screw 138 being then rotated to apply variable loading pressure to the clutch. Reversing the feed-drum drive.-A gear carrier 89, Figs. 9 and 10, is rotatably supported on the hub of the haulage drum 8 and carries gears 94, 96 in mesh with teeth 97 in the drum, gear 96 also meshing with an idler 95. The carrier 89 has pin-and-slot connection with toggle links 102 connected to a sector 104 which is rocked so as to turn the carrier 89 to bring either gear 94 or idler 95 into mesh with the driving pinion 61. The sector is controlled through lever 106, Fig. 6, link 107, annular plate 108, link 112, and lever 114 by an axially movable rod 116. Parts 105 of the machine frame limit movement of the sector.