Boring or penetrating the earth – With below-ground tool drive prime mover
Patent
1979-08-06
1982-03-30
Pate, III, William F.
Boring or penetrating the earth
With below-ground tool drive prime mover
175215, 175405, E21B 414, E21B 1002
Patent
active
043219748
ABSTRACT:
An annular drilling hammer having an annular bore crown guided between an outer tube and an inner tube. An annular hammer piston periodically strikes the bore crown and has a piston member that is guided in a cylindrical chamber having control apertures which are connected fluidically to a reversing valve. The working medium is delivered to the reversing valve between an inner tube system and an outer tube system. After driving the hammer piston the medium is discharged from the drill between the outer tube and the bore crown. The bore crown is provided with flow channels leading from the rear shoulder through and to the front and/or central aperture of the bore crown. The flow of driving medium through these channels aids the entrainment of bored material, which then is carried out through the inner tube with the aid of a Venturi opening.
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Hydroc Gesteinsbohrtechnik GmbH
Pate III William F.
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