Drilling head of a rotary impact drill

Details Drilling head of a rotary impact drill Drilling head of a rotary impact drill

1979-02-15

1981-01-06

Pate, III, William F.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175320, 175417, E21B 1038

Patent

active

042431131

ABSTRACT:
An exhaust channel in a rock drilling head of a rotary impact drill has an pening which extends over the front face of the drill shaft and over the adjoining peripheral surface of the drill shaft. Clogging of the exhaust channel is prevented by providing clearances between the forward and peripheral surfaces of the drilling head and the bored hole which are too small to permit the passage of rock particles large enough to block the exhaust channel.

REFERENCES:
patent: 3163246 (1964-12-01), Vagins et al.
patent: 3434553 (1969-03-01), Weller
patent: 3434554 (1969-03-01), Bowers, Jr.

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