GB240614A - Improvements in connection with coal-cutting machines - Google Patents

Abstract

240,614. Hurd, F. W. Sept. 2, 1924. Coal-cutting machines. - A coal-cutting machine has a gear head carrying the turntable, a driven gear and gear-head shaft within and carried entirely by the gear head, a motor-driven shaft carrying a pinion in mesh with the driving gear, a cutter actuating member with bearings therefor carried entirely by the turntable and a flexible driving connection between the driven gear and the cutter actuating member. In a chain machine the motor shaft 1, 2 is divided at the gear head, the parts being automatically connected by a centrifugal clutch 3, 4, on starting of the motor, while a member 5 may be moved by a lever 6 to disengage the clutch. The shaft section 2 is supported in bearings 2<a> 2<b>, and carries a bevel gear 8 meshing with a crown wheel 9 fixed to a hollow shaft 10 entirely supported in the gear head 11, which may be split vertically. A turntable 14 carries the jib and entirely supports the chain driving sprocket 12 which is connected to the shaft 10 by a hexagonal, square, splined or castellated shaft 13 engaging corresponding bores in the parts 10, 12 and having sufficient freedom to avoid non-torsional stresses. The shaft 13 may be lifted by hand or screw means to interrupt the drive of the sprocket 12 &c. The turntable 14 has a bevel rack 15 engaged by bevel pinions 16, driven manually or from the haulage gear to slue the jib; a toothed segment 17 connected to a screw 18 may be moved by means of a rotatable nut 19 to engage the rack 15 to lock the jib. The construction may be modified for use with cutter-bar machines.