Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Patent
1991-01-15
1992-04-07
Neuder, William P.
Boring or penetrating the earth
Automatic control
Of boring means including a below-ground drive prime mover
175 73, E21B 706
Patent
active
051019124
ABSTRACT:
Steerable ground drilling device, which comprises a body (3) destined to be attached to a flexible pipe, a rotatable head (4) which is mounted on the front extremity of the body (3) and is provided with at least one spraying device or hammer drill (5) to which fluid under pressure can be supplied through a pipe (10 through 13) which extends through the head (4) and the body (3), and means (6) for rotating the head (4), characterized in that the means (6) for rotating the head (4) are means which can rotate this head (4) both in one direction and in the other direction and that, between the head (4) and the body (3), an axially located shaft section (7) is mounted that is attached to the head (4) and through which extends the pipe (10 through 13) for the supply of fluid under pressure to the spraying device (5), a cylinder (14) which surrounds the shaft section (7) and comprises an outer periphery which is eccentric in relation to the shaft section (7), and a blocking mechanism (15) is mounted that can couple the cylinder (14) to the shaft section (7) or can release it from the shaft section (7).
REFERENCES:
patent: 2712434 (1955-07-01), Giles et al.
patent: 4040495 (1977-08-01), Kellner et al.
patent: 4632191 (1986-12-01), McDonald et al.
patent: 4770258 (1988-09-01), Falgout, Sr.
patent: 4921055 (1990-05-01), Kayes
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