GB235999A - Improvements in coal mining apparatus - Google Patents

Abstract

235,999. Tugwood, R. J., (Jeffrey Manufacturing Co.). April 30, 1924. Coal-cutting machines.-Elongated coal cutting and conveying apparatus, comprising a chain cutter and a conveyer in parallel relation, is constructed in readily disconnectible sections, each section comprising a guide frame or base section fitted with coupling means and with lateral feed mechanism adapted to be coupled with a source of power common to the, feed mechanism of the various sections. Each frame section comprises a base plate 1 supporting a conveyer frame 4 and cutter bar section 2. Adjacent conveyer frame sections are connected by overlapping coupling bars 8, 9 and hinge pins 10, one pair of the bars 8, 9, preferably having longitudinal play; the cutter bar sections are connected by means of overlapping plates 12 attached to the top plate of the section only, or to both top and bottom plates, the plates 12 having notches 13 adapted to register and then to receive rectangular keys. Each frame section has feeding mechanism comprising a casing 15 supporting a shaft 14 with two worms 16, each worm driving a screw 20 which co-operates with a nut 21 carried in a preferably spherical mounting in a foot plate 22 pivotally connected to an anchor jack 27. Each nut has. a ratchet and pawl device 23 whereby it may be locked to the foot-plate while tne latter and its anchor jack 27 are used as an abutment; at the end of the feed movement, the other foot plate and anchor jack are used as an abutment for further feed movement, while the first nut is freed and moved, with its foot plate &c., along the screw 20 ready for re-fixing. The worm shafts 14 have clutch ends whereby they may be connected together by intermediate shafts and driven simultaneously from a shaft 32, which shaft also drives the cutter chain through bevelled gearing 34 and the conveyer through chain gearing 33 connected to the elevated delivery end of the conveyer.