Method and apparatus for tunneling upwardly

Details Method and apparatus for tunneling upwardly Method and apparatus for tunneling upwardly

1975-02-20

1978-09-19

Purser, Ernest R.

Tool driving or impacting

Processes

173152, 173164, 175 52, 175 85, E21B 700

Patent

active

041146980

ABSTRACT:
A vertical thrust boring machine adapted to be positioned in the horizontal drift of a mine and to cut a tunnel extending upwardly from the drift so as to remove ore or other cuttings therefrom. The machine includes a rotary table for lifting a drill string which in turn supports the cutter head, and is characterized by drill stem sections having a spline connection on their lower ends, and a drive coupling ring associated with the rotary platform having a mating spline connection, so that when changing the length of the drill string the lowermost drill stem section can slide or float vertically relative to the rotary platform at the same time that it is being drivingly rotated.

REFERENCES:
patent: 1264156 (1918-04-01), Chapman
patent: 3460638 (1969-08-01), Millsapps, Jr.
patent: 3554298 (1971-01-01), Klein
patent: 3604754 (1971-09-01), Hosel
patent: 3741322 (1973-06-01), Wolters
patent: 3750769 (1973-08-01), Young et al.
patent: 3833070 (1974-09-01), Anderson
patent: 3851714 (1974-12-01), Visser
patent: 3857451 (1974-12-01), Williams

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