Rock drill

Details Rock drill Rock drill

1995-06-07

1996-09-10

Tsay, Frank

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175400, 761086, E21B 1040

Patent

active

055536824

ABSTRACT:
A rock drill includes an axially elongated shank with a chucking shank part (1) at one end, a drilling shank part (2) extending from the chucking shank part and having at least four drilled material conveying flutes (4, 5, 6, 7) disposed next to one another in a parallel manner, and a drilling head at the opposite end of the shank and formed of hard metal and having four removal flutes (8, 9, 10, 11) spaced apart about its outer circumferential surface. The removal flutes have transverse cross-section of different size and each of the transverse cross-sections of the removal flutes (8, 9, 10, 11) open into one of the conveying flutes (4, 5, 6, 7) of the drilling shank part.

REFERENCES:
patent: 580398 (1897-04-01), Hoenscheid
patent: 599537 (1898-02-01), Steudner
patent: 750537 (1904-01-01), Hanson
patent: 2217202 (1940-10-01), Gelpcke
patent: 3089354 (1963-05-01), Claas et al.
patent: 4286677 (1981-09-01), Guex
patent: 4898503 (1990-02-01), Barisk
patent: 5297456 (1994-03-01), Nishimura
patent: 5423640 (1995-06-01), Lindblom et al.

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