Rock drill

Details Rock drill Rock drill

1988-12-15

1990-02-27

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175415, 175420, E21B 1036, E21B 1044, E21B 1058, B28D 114

Patent

active

049037870

ABSTRACT:
A rock drill haivng a drill head with cruciform cutting tips is proposed which has improved chiselling properties in the case of percussive loading in hard rock or the like. For this purpose, the main cutting tip (4) is of a design know per se with secondary cutting tips (7,8) which are arranged transverse thereto and have a roof-shaped cross-section in side elevation. Additional, radially further outward bit points (16) for working the material result from the roof-shaped cross-section of the secondary cutting timps (7,8,) (cf. drawing).

REFERENCES:
patent: 1106966 (1914-08-01), Pauli
patent: 2673716 (1954-03-01), Avery
patent: 2865606 (1958-12-01), Farmer
patent: 3674101 (1972-07-01), Chromy
patent: 3760894 (1973-09-01), Pitifer
patent: 4294319 (1981-10-01), Guergen

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