Directional impact tool for tunneling

Details Directional impact tool for tunneling Directional impact tool for tunneling

1977-09-30

1979-03-20

Purser, Ernest R.

Boring or penetrating the earth

Boring without earth removal

175 61, 175 73, 175390, 173125, E21B 1102, E21B 704

Patent

active

041449410

ABSTRACT:
A hole-driving tool having an air-operated hammer for impacting against an anvil in the body of the tool to cause the tool to tunnel through the ground, wherein the direction of travel is controlled by providing a variable mass distribution over the hammer and anvil combination, and controlling the relative impact position of the hammer against the anvil.

REFERENCES:
patent: 973887 (1910-10-01), Steinmetz
patent: 1771312 (1930-07-01), Pierce
patent: 2648524 (1953-08-01), Dionisotti
patent: 3679005 (1972-07-01), Inaba et al.
patent: 3952813 (1976-04-01), Chepurnoi

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