Rotary percussive drilling device

Details Rotary percussive drilling device Rotary percussive drilling device

2008-07-29

2008-07-29

Bagnell, David J. (Department: 3672)

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

C175S093000, C175S299000

Reexamination Certificate

active

07404458

ABSTRACT:
The device has a drill body, of generally cylindrical shape, connected by a flexible pipe to a high-pressure water pump placed on a low-height carrying vehicle. A striking piston is mounted movably, and is resiliently returned, in the drill body, and is subjected to a pulsed high water pressure so as to be moved with a percussive movement against a bit-carrying anvil, the pipe simultaneously transmitting to the drill body an alternating rotary movement about its principal axis. A solenoid valve, interposed between the pump and the point of departure of the pipe, receives successive electrical pulses causing opening and closing, which create shock waves in the water column contained in the pipe, which transmits these shock waves to the striking piston of the drill body. Applications: underground workings, mine workings, particularly for use in low-height galleries.

REFERENCES:
patent: 4141592 (1979-02-01), Lavon
patent: 5803188 (1998-09-01), McInnes
patent: 6910542 (2005-06-01), Walter
patent: 0 733 152 (2003-03-01), None

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