Anti-collaring structure for impact bit

Details Anti-collaring structure for impact bit Anti-collaring structure for impact bit

1979-10-09

1981-04-21

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Cutting edges facing in opposite axial directions

175395, E21B 1044

Patent

active

042627621

ABSTRACT:
Rib structure for an impact type rock drilling bit, spirally oriented on the external surface of the bit to move particulate matter forwardly relative to the bit when it be turned in its normal drilling direction, to aid the process of extraction of the bit from a drilled hole.

REFERENCES:
patent: 2558341 (1951-06-01), Cory et al.
patent: 2579720 (1951-12-01), Atkinson
patent: 2602639 (1952-07-01), Green
patent: 3043385 (1962-07-01), Boyle
patent: 3128835 (1964-04-01), Kirker
patent: 3608654 (1971-09-01), Powell et al.

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