Apparatus on drum shearer for cutting through safety wall in lon

Details Apparatus on drum shearer for cutting through safety wall in lon Apparatus on drum shearer for cutting through safety wall in lon

1979-02-23

1981-05-12

Purser, Ernest R.

Mining or in situ disintegration of hard material

Hard material disintegrating machines

Sidewall-working

299 71, E21C 2724

Patent

active

042668280

ABSTRACT:
A safety wall treating method employed in the coal mining operation at the long wall face of a coal mine comprises shearing the long wall face leaving safety wall(s) at one or both side(s) of the face but shearing through the safety wall(s) at regular intervals to form intake or exhaust openings communicating with intake or exhaust tunnels.

REFERENCES:
patent: 3753595 (1973-08-01), Lanfermann
patent: 3907367 (1975-09-01), Nakajima et al.

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