Hydraulic drill string

Details Hydraulic drill string Hydraulic drill string

2006-02-07

2006-02-07

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

C173S135000, C173S136000

Reexamination Certificate

active

06994175

ABSTRACT:
A hydraulic drill string device can be in the form of a percussive hydraulic in-hole drilling machine that has a piston hammer (50) with an axial through hole (51) into which a tube (35) extends. The tube forms a channel for flushing fluid from a spool valve (62) and the tube wall contains channels (40) with ports (41,42) cooperating with the piston hammer for controlling the valve.

REFERENCES:
patent: 3084673 (1963-04-01), Sears
patent: 3229776 (1966-01-01), Collier
patent: 3527239 (1970-09-01), Boom
patent: 4883133 (1989-11-01), Fletcher et al.
patent: 5107944 (1992-04-01), Gustafsson
patent: 5131476 (1992-07-01), Harrington
patent: 6135216 (2000-10-01), Lyon et al.

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