Suspended drilling system

Details Suspended drilling system Suspended drilling system

1979-04-04

1980-07-29

Feldbaum, Ronald

Tool driving or impacting

Drive by means reacting to rotating eccentric mass

173147, E21C 500, E21C 900, E21C 1100

Patent

active

042146399

ABSTRACT:
A suspended drill system for drilling vertical holes in the ground at a distance from a supporting crane. A pivotable plate, attached to a crane boom point, has a first tube having a non-round cross-section attached thereto. A second tube (or plural telescoping tubes) vertically slidable in said first tube has a frame attached at the lower end. The frame is movable vertically by the crane hoisting cable. A drill stem extends downwardly of the frame and is rotated for drilling by an engine within the frame. This system allows drilling in unstable ground at a considerable distance above, below, or to the side of stable ground supporting the crane.

REFERENCES:
patent: 3550693 (1970-12-01), Bermingham
patent: 3768575 (1973-10-01), MacKinnon et al.
patent: 3881555 (1975-05-01), Cresp
patent: 4102094 (1978-07-01), MacKinnon

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