Method and apparatus for upwardly cutting full cutting face of a

Details Method and apparatus for upwardly cutting full cutting face of a Method and apparatus for upwardly cutting full cutting face of a

1978-04-10

1981-02-03

Pate, III, William F.

Boring or penetrating the earth

Processes

175171, 175 94, 173152, E21D 300

Patent

active

042483123

ABSTRACT:
There is provided a method and apparatus for upwardly excavating a shaft through destructible underground rock. The cutting operation is carried out by full face boring without relying on blasting. An operation for supporting the shaft side wall is carried out by means of frame segments loosely following the advance of the bit. The cutting operation and supporting operation are independent from one another. The diameter of the bit is contracted after the cutting operation to allow the bit to be lowered down through the frame segments.

REFERENCES:
patent: 1645766 (1927-10-01), McCulloch et al.
patent: 3703212 (1972-11-01), Abrahams
patent: 3840272 (1974-10-01), Crane
patent: 4083416 (1978-04-01), Still et al.
patent: 4114698 (1978-09-01), Webb

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