Longwall coal mining machine with plural cutters on sub-ranging

Details Longwall coal mining machine with plural cutters on sub-ranging Longwall coal mining machine with plural cutters on sub-ranging

1976-02-26

1977-06-07

Purser, Ernest R.

Mining or in situ disintegration of hard material

Hard material disintegrating machines

Sidewall-working

299 71, 299 80, 299 87, E21C 2724

Patent

active

040279189

ABSTRACT:
A coal mining machine intended to be used in a pit having a long-walled pit face and having a mechanism in which two cutting drums are attached to the main ranging arm of a ranging drum shearer through a sub-ranging arm and the position of said cutting drums is defined by the cooperation of said main- and sub-ranging arms.

REFERENCES:
patent: 2767970 (1956-10-01), Paul
patent: 3136535 (1964-06-01), Lanfermann
patent: 3639004 (1972-02-01), Lockwood et al.
patent: 3718369 (1973-02-01), Anderson
patent: 3907367 (1975-09-01), Nakajima

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