System for boring raises having portions of different diameters

Details System for boring raises having portions of different diameters System for boring raises having portions of different diameters

1978-05-30

1979-12-11

Leppink, James A.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175268, 175344, E21C 2300

Patent

active

041778669

ABSTRACT:
A raise boring system is provided for boring raise holes wherein the finished raise holes have portions of different diameters. The system includes a raise head with a central drive stem defining an axis of rotation. Primary cutter means are positioned on the raise head for disintegrating the earth formations out to a first radial distance from said axis of rotation. Expanding secondary cutter means are positioned on the raise head for selectively disintegrating earth formations from said first radial distance out to additional and greater radial distances from said axis of rotation. The expanding secondary cutter means may be selectively located in a first position either beneath or in the same plane as the primary cutter means during boring at said first radial distance from said axis of rotation and selectively located in additional positions for boring at greater radial distances from said axis of rotation. Expansion means are provided for moving said expanding secondary cutter means to said additional positions during the boring operation.

REFERENCES:
patent: 2654575 (1953-10-01), Kammerer
patent: 2841380 (1958-07-01), Thassy
patent: 3387893 (1968-06-01), Hoever
patent: 3858667 (1975-01-01), Goodfellow
patent: 4071098 (1978-01-01), Dively et al.
patent: 4083416 (1978-04-01), Still et al.

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