Mining machine

Details Mining machine Mining machine

E - Fixed Constructions

21

C

262/77

E21C 27/00 (2006.01) E21C 27/22 (2006.01) E21C 31/02 (2006.01)

Patent

CA 1044260

ABSTRACT OF THE DISCLOSURE A mining machine adapted to be driven forwardly towards a working face comprises one or more cutting booms projecting forwardly from the machine, a cutting tool mounted on the forward end of the or each boom, and a drive mechanism including a motor for rotating the cutting tool relative to the boom and a multi-speed gearbox whereby the cutting tool may be selectively driven at two or more different cutting speeds. The gearbox has a selector lever lockable by a key in any of its operating positions, and the motor has a lock in which the key must be engaged to render the motor operative. Thus, the cutting speed can only be altered when the motor is stopped.

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