Drilling bit for blast furnace tap holes

Details Drilling bit for blast furnace tap holes Drilling bit for blast furnace tap holes

1979-02-05

1981-06-16

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175415, 175418, E21B 1000

Patent

active

042732026

ABSTRACT:
A drilling bit for blast furnace tap holes and the like which facilitates rapid drilling of clay within the tap hole and which can be readily and easily machined to accommodate tap holes of different diameters. The bit is characterized in having inclined cutting edges which converge into a point and are separated by flutes into which compressed air is forced to rapidly dislodge the drilled clay from between the cutting edges. By virtue of the convergence of the cutting edges into a point, the bit becomes self-centering during the drilling operation.

REFERENCES:
patent: 2013070 (1935-09-01), Sheridan
patent: 2016068 (1935-10-01), Bannister
patent: 2022101 (1935-11-01), Wright
patent: 2028580 (1936-01-01), Yedd
patent: 2673716 (1954-03-01), Avery
patent: 2756967 (1956-07-01), Meutsch
patent: 2802642 (1957-08-01), Feucht
patent: 3163246 (1964-12-01), Vagins et al.

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