Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent
1980-09-10
1982-02-02
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Plural separable cutter elements
175418, E21B 1058
Patent
active
043135064
ABSTRACT:
A drill cutter bit having good performance characteristics for drilling in various types of strata including not only hard and medium rock formations but also soft rock formations such as in mine roof drilling. The drill bit includes an elongated hollow shank portion and an integral head portion having multiple working surfaces provided with a transversely extending slot adapted to receive a plate-like, insert cutter element therein. The work surfaces include pairs of oppositely disposed heel and compression surfaces that taper downwardly and outwardly via a predetermined compression angle to provide an abrading and shearing action for progressively reducing the drill cuttings to a relatively dust-like consistency. A pair of oppositely disposed dust collecting openings are constructed and arranged to cooperate with the compression surfaces to define dust collection intake passageways that act to give a metering action on the dust-like material for removal through the shank portion during drilling.
REFERENCES:
patent: 1641321 (1927-09-01), Cubley
patent: 2844358 (1958-07-01), Eberman et al.
patent: 3434553 (1969-03-01), Weller
patent: 3434554 (1969-03-01), Bower, Jr.
patent: 4099585 (1978-07-01), Emmerich
patent: 4190128 (1980-02-01), Emmerich
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