Device for boring

Details Device for boring Device for boring

1978-07-11

1980-04-08

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

With bit guide or bore wall compacting device

55482, 175398, E21B 1710

Patent

active

041967836

ABSTRACT:
Boring apparatus comprising a tubular casing containing a cylindrical body adapted for being driven by a boring rod and a filter body adjacent the cylindrical body. A boring tool is mounted outside the tubular casing at the end of the filter body. The filter body has a cross-section of polygon shape with axially extending edges in contact with the inner surface of the tubular casing to define clearance spaces between the inner surface of the tubular casing and the outer surface of the filter body. The cylindrical body has axial grooves extending to the clearance spaces for passage of boring particles. The cylindrical body can also be provided with annular grooves. Preferably, the cylindrical body and filter body are constituted as a single unit.

REFERENCES:
patent: 791264 (1905-05-01), Hardsoog
patent: 1220739 (1917-03-01), Freeon
patent: 2485826 (1949-10-01), Harinck
patent: 3220742 (1965-11-01), Moates
patent: 3277972 (1966-10-01), Lagerstrom
patent: 3370658 (1968-02-01), Jansson
patent: 3682260 (1972-08-01), Klemm
patent: 3848683 (1974-11-01), Persson
patent: 3914196 (1976-03-01), Curington et al.

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