Horizontal earth boring machine and method

Details Horizontal earth boring machine and method Horizontal earth boring machine and method

1989-03-29

1990-12-11

Kisliuk, Bruce M.

Boring or penetrating the earth

Automatic control

175 26, 175 27, 175 62, 175113, 173170, E21B 302, E21B 4400

Patent

active

049763210

ABSTRACT:
An earth boring apparatus is illustrated including an engine and an earth boring string wherein a hydraulic clutch driven by the engine is supplied with hydraulic fluid through an electrically operated valve controlled by a manually operated trigger so that release of the trigger resulting from a torque as may be occasioned by encountering a rock or other obstruction interrupts manual operation of the trigger disabling the clutch.

REFERENCES:
patent: 1834727 (1931-12-01), Pearson
patent: 1868685 (1932-07-01), Bayles
patent: 1940693 (1933-12-01), Pearson
patent: 2617629 (1952-11-01), Robinson
patent: 2696972 (1954-12-01), Howe
patent: 3170738 (1963-10-01), Osborn
patent: 3807509 (1974-04-01), Linsay
patent: 3828861 (1974-08-01), Verkuil
patent: 3907043 (1975-09-01), Appleman
patent: 4024923 (1977-05-01), Broodbent
patent: 4553612 (1985-11-01), Durham

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