Rotatable drilling head

Details Rotatable drilling head Rotatable drilling head

1982-08-23

1984-04-24

Novosad, Stephen J.

Boring or penetrating the earth

Common drive or advancing means for concurrently boring...

175172, 175394, 299 56, E21B 1044

Patent

active

044442785

ABSTRACT:
A drilling head for use in mining operations comprises a cylindrical drum having an open rear end and defining an interior cavity, an exterior spiral arranged to forwardly advance mined particles, a nose spiral disposed in advance of the drum and arranged so as to rearwardly advance the mined particles, the exterior and nose spirals terminating generally at the front portion of the drum and together defining at least one recovery aperture through which the mined particles forwardly advanced by the exterior spiral and rearwardly advanced by the nose spiral can pass to the interior cavity, and an interior spiral coaxially disposed and rotatable in the interior cavity in a direction opposing the rotational direction of the drum.

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patent: 4219239 (1980-08-01), Weikert et al.
patent: 4275926 (1981-06-01), Hodges

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