Maneuvering impact boring head

Details Maneuvering impact boring head Maneuvering impact boring head

1996-03-11

1998-08-18

Dang, Hoang C.

Boring or penetrating the earth

Boring without earth removal

173 91, 175 73, 175296, E21B 414

Patent

active

057947180

ABSTRACT:
An impact boring head may comprise a main body having an internal cavity with a front end and a rear end. A striker having a head end and a tail end is slidably mounted in the internal cavity of the main body so that the striker can be reciprocated between a forward position and an aft position in response to hydraulic pressure. A compressible gas contained in the internal cavity between the head end of the striker and the front end of the internal cavity returns the striker to the aft position upon removal of the hydraulic pressure.

REFERENCES:
patent: 3032998 (1962-05-01), Atkinson
patent: 3630295 (1971-12-01), Coyne et al.
patent: 3794128 (1974-02-01), Gagen et al.
patent: 4078619 (1978-03-01), Sudnishnikow et al.
patent: 4592432 (1986-06-01), Williams et al.
patent: 4596292 (1986-06-01), Crover
patent: 4621698 (1986-11-01), Pittard et al.
patent: 5255749 (1993-10-01), Bumpurs et al.
patent: 5553764 (1996-09-01), Remerowski
Sales brochure of the Charles Machine Works, Inc. for the Ditch Witch Pierce Airrow Pneumatic Piercing Tool.
Sales brochure fof Steer-Rite, Ltd. for the Pathfinder, Patriot 2000, Essig, and IH300 Boring Tools.
Sales brochure of Allied Company for various Hole-Hog Underground Boring Tools.

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