Blast furnace taphole drill

Details Blast furnace taphole drill Blast furnace taphole drill

1981-05-12

1984-06-26

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175417, E21B 1036

Patent

active

044560834

ABSTRACT:
A blast furnace taphole drill has a flaring head (3) with cutting edges (5) at its cutting end formed by intersecting angled faces. A central bore (4) carries cleaning air to the cutting end. To prevent blockage of the cleaning air bore (4) by debris and possible jamming of the drill, the head has deep radial grooves (6) formed at the bottoms of the valley shapes between the cutting edges (5). The grooves (6) extend radially from the air bore (4) and conduct the air so that it can get behind or under jammed debris. Reduced taphole drilling times can be achieved.

REFERENCES:
patent: 1764989 (1930-06-01), Signell et al.
patent: 2368512 (1945-01-01), Zimmerman
patent: 2634954 (1953-04-01), Eakin
patent: 2641446 (1953-06-01), Haglund et al.
patent: 2879973 (1959-03-01), Saxman
patent: 3128836 (1964-04-01), Hjalsten et al.
patent: 3726351 (1973-04-01), Williams

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