Hollow drill bit

Details Hollow drill bit Hollow drill bit

1990-11-13

1992-01-21

Neuder, William P.

Boring or penetrating the earth

Bit or bit element

Core forming type

175411, 285286, 285287, E21B 1704

Patent

active

050820702

ABSTRACT:
A hollow drill (1) is made up of a tubular carrier part (2), a cutter part (3) and an intermediate part (4) extending between the carrier part (2) and cutter part (3). The intermediate part (4) is rigidly fixed to the cutter part (3). The carrier part (2) and the intermediate part (4) have axially extending extensions (11, 12) which telescope one into the other with solder (8) located between and removably connecting the extensions (11, 12) together.

REFERENCES:
patent: 649488 (1900-05-01), Schrader
patent: 2034808 (1936-03-01), Graham
patent: 2094495 (1937-09-01), Robinson et al.
patent: 2206166 (1940-07-01), Dunn
patent: 2460667 (1949-02-01), Wurzburger
patent: 2665886 (1954-01-01), Ellis
patent: 2750156 (1956-06-01), Coates
patent: 4182950 (1980-01-01), Boros
patent: 4657441 (1987-04-01), Horvath

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