Drilling tool for use in constructing large diameter piles, vent

Details Drilling tool for use in constructing large diameter piles, vent Drilling tool for use in constructing large diameter piles, vent

1994-06-08

1995-07-11

Bagnell, David J.

Boring or penetrating the earth

With receptacle

299 56, 299 90, E21B 1006, E21B 106

Patent

active

054312388

ABSTRACT:
A drilling tool is adapted for being releasably mounted to a lower end of a rod string (20) of a drilling rig (30) and includes a container (2) having a cylindrical or truncated-cone shape fitted at the lower end with a plurality of cutting tools or cutters (10) for crushing rock. The drilling tool (1) further includes a plate (3) for releasably retaining a plurality of modular elements (14) forming a load (13), and curved blades (9), which are located proximate to the cutting tools (10), adapted for conveying rock spalls into the container (2) through suitable apertures (8) in a bottom of the container (2). The cutting tools (10) are mounted to a plurality of radial plates (7) securely fixed proximate to the bottom edge of the container (2). The curved blades are welded to the edges of the radial plates (7), the concavity of each blade (9) being arranged facing the direction of rotation of the drilling tool (1).

REFERENCES:
patent: 4330155 (1982-05-01), Richardson et al.
patent: 5199515 (1993-04-01), Sinclair et al.
patent: 5325932 (1994-07-01), Anderson et al.

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