Rock drilling tool with radially extendable two-piece reamer

Details Rock drilling tool with radially extendable two-piece reamer Rock drilling tool with radially extendable two-piece reamer

1998-08-10

2000-06-20

Neuder, William

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175391, E21B 1032

Patent

active

060766182

ABSTRACT:
A rock drilling tool includes a drill body on which a radially extendible reamer is mounted. The reamer, when extended, enlarges the hole diameter to enable a hole casing to be pulled down by the tool. The body includes a front pilot bit, a rear shank adapted to be connected to a drill string, and a guiding member disposed between the pilot bit and the rear shank for pulling the hole casing along with the tool. The pilot bit, the rear shank and the guiding member are non-removable from one another. The reamer, which is mounted between the guiding member and the pilot bit, is formed of two U-shaped pieces that are hinged together to enable the reamer to be installed and removed.

REFERENCES:
patent: 5009271 (1991-04-01), Maric et al.
patent: 5040621 (1991-08-01), Lof
patent: 5259469 (1993-11-01), Stjernstrom et al.
patent: 5284216 (1994-02-01), Brungs et al.

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