Drill bit

Details Drill bit Drill bit

1987-09-08

1989-02-21

Bilinsky, Z. R.

Tool driving or impacting

Work cleansing

Cleansing fluid passage in impact transmitting anvil

173132, 175418, 408 59, E21B 414

Patent

active

048057053

ABSTRACT:
A drill bit for use in a drill string comprising a set of a plurality of central rod members and a set of a plurality of tubular members surrounding said rod members. The drill bit is provided with a longitudinally extending flushing channel which communicates with an annular space between the rod members and the tubular members via a transverse passage. The flushing channel comprises at least two end passages terminating in the bit front. The cross section area of each of the end passages is smaller than the overall cross section area of the portion of the flushing channel located between the end passages and the transverse passage.

REFERENCES:
patent: 1157605 (1915-10-01), Waugh
patent: 1232111 (1917-07-01), Smith
patent: 3866746 (1975-02-01), Curington
patent: 3893521 (1975-07-01), Bailey et al.
patent: 4003442 (1977-01-01), Bassinger
patent: 4094364 (1978-06-01), Lundstrom et al.
patent: 4137002 (1979-01-01), Barker et al.
patent: 4280570 (1981-07-01), Walter
patent: 4446929 (1984-05-01), Pillow
patent: 4450920 (1984-05-01), Krasnoff et al.
patent: 4572307 (1986-02-01), Tunnell

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