Machine for mechanically advancing clean cut underground mining

Details Machine for mechanically advancing clean cut underground mining Machine for mechanically advancing clean cut underground mining

1978-06-06

1980-01-29

Purser, Ernest R.

Mining or in situ disintegration of hard material

Hard material disintegrating machines

Stepper-type advance-causing means

299 60, 299 61, E21D 910

Patent

active

041858735

ABSTRACT:
A method for mechanically advancing clean cut underground mining galleries of various profiles, in which during a primary phase of the operation a pilot excavation of circular cross-section smaller than the final desired cross-section of the mining gallery is carried out and in which during a secondary phase of the operation, overlapping in time with the primary phase, the pilot excavation is widened to the desired finished cross-section of the mining gallery; and a machine for carrying out the method.

REFERENCES:
patent: Re24965 (1961-04-01), Kirkpatrick
patent: 3386520 (1968-06-01), Lawrence et al.
patent: 3446535 (1969-05-01), Lauber
patent: 3643998 (1972-02-01), Williamson
patent: 3840271 (1974-10-01), Sugden
patent: 3920277 (1975-11-01), Winberg et al.
patent: 3979151 (1976-09-01), Plummer

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