Rock drill

Details Rock drill Rock drill

1988-03-07

1989-12-26

Massie, Jerome W.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175410, E21B 1044, E21B 1058

Patent

active

048892009

ABSTRACT:
A rock drill is provided in which an optimum support of the carbide cutting tip or of a cross cutting edge is achieved by the drill head being made square or rectangular in cross-section. This results in an optimum strengthening of the cross-section against fracture in the slot root for the cutting tips. Moreover, catching of the drill in fissured rock and under extreme loads such as in reinforcement drill holes is avoided.

REFERENCES:
patent: 1106966 (1914-08-01), Pauli
patent: 1324631 (1916-12-01), Usrey
patent: 2051525 (1936-08-01), Howard
patent: 2522045 (1950-09-01), Knowles
patent: 2890021 (1959-06-01), Sanvig
patent: 2969846 (1961-01-01), Sanvig
patent: 3198270 (1965-08-01), Horvath
patent: 4314616 (1982-02-01), Rauckhorst et al.
patent: 4765419 (1988-08-01), Scholz et al.

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