Single-pass notching and drilling tool and method of drilling a

Details Single-pass notching and drilling tool and method of drilling a Single-pass notching and drilling tool and method of drilling a

1982-07-12

1985-10-29

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175417, E21B 1038, E21B 1040

Patent

active

045496153

ABSTRACT:
Disclosed is a single-pass notching and drilling tool. The tool comprises an adaptor having a first threaded end for coupling with a power source, an opposed second threaded end, an enlarged diameter portion adjacent to the first threaded end and having a first abutment face and a mediate portion adjacent to the first axial abutment face and adjacent to the second threaded end. There is also a drill portion joined to the second threaded end of the adaptor and having a second axial abutment face. The tool further comprises a notching tool comprising a body having a central bore rotatably engaging the mediate portion of the adaptor. The notching tool is freely rotatable about the mediate portion independent of the rotation of the adaptor. The axial movement of the notching tool is bounded by the first and second axial abutment faces. Disclosed also is a method of drilling a blast hole with the single-pass notching and drilling tool.

REFERENCES:
patent: 740906 (1903-10-01), Owen
patent: 1943879 (1934-01-01), Rea
patent: 2938709 (1960-05-01), Curtis
patent: 3227230 (1966-01-01), Lagerstrom
patent: 4294319 (1981-10-01), Guergen
patent: 4361197 (1982-11-01), Hutzell

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