Sampling drill

Details Sampling drill Sampling drill

1975-05-22

1978-01-03

Novosad, Stephen J.

Boring or penetrating the earth

With means movable relative to tool below ground to stop...

175321, 175 58, E21C 1302, E21B 4100, E21B 4902

Patent

active

040661393

ABSTRACT:
A sampling drill comprising a plurality of drill rods coupled together to form a drill stem suspended from a drill head, each of the drill rods comprising a pair of substantially concentric tubular members defining an inner central passage and an annular passage, the lower end of the drill stem being fitted with a drill bit having an inner chamber adapted to be connected to the inner central passage of the drill stem, and one or more passages adapted to be connected at one end to the annular passage in the drill stem and at the other end to discharge into the inner chamber, the inner chamber being provided with openings located adjacent the cutting edges of the drill bit so that material cut by the drill bit can pass into the chamber, and means for shutting off the inner central passage to prevent material entering the inner chamber of the drill bit and entering the inner central passage.

REFERENCES:
patent: 2248910 (1941-07-01), Auld et al.
patent: 2412915 (1946-12-01), Sewell
patent: 2894727 (1959-07-01), Henderson
patent: 3062045 (1962-11-01), Sokjer-Petersen et al.
patent: 3146837 (1964-09-01), Bridwell
patent: 3151690 (1964-10-01), Grable
patent: 3323604 (1967-06-01), Henderson

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