Pneumatic drill with central evacuation outlet

Details Pneumatic drill with central evacuation outlet Pneumatic drill with central evacuation outlet

1995-01-20

1996-04-30

Tsay, Frank S.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175317, E21B 414

Patent

active

055116280

ABSTRACT:
A drill bit is mounted for percussive reciprocal movement in the lower end segment of a drill wear tube. A barrel is in the wear tube and defines a first and second series of exhaust ports. Channels in the barrel communicate the exhaust ports with discharge openings spaced about the head of the drill bit. An inlet opening in the face of the drill bit receives airborne earthen particles carried to an evacuation tube. Keys and keyways are disposed about the drill bit in parallel with the drill bit axis permitting a passageway of optimum size. Disposed within the barrel is a tubular piston which reciprocates in response to pressurized air alternately directed to the piston ends. The piston ends open and close the barrel exhaust ports. Internal surfaces of the piston cooperate with surfaces on the evacuation tube and on a press fitted sleeve thereon to direct compressed air to the piston ends.

REFERENCES:
patent: 3030121 (1962-04-01), Scott
patent: 4007798 (1977-02-01), Gazda
patent: 4174848 (1979-11-01), Richardson
patent: 4202557 (1980-05-01), Haussmann et al.
patent: 4512692 (1985-04-01), Nielsen
patent: 4726429 (1988-02-01), Kennedy
patent: 4928775 (1990-05-01), Lee
patent: 5085284 (1992-02-01), Fu
patent: 5207283 (1993-05-01), Lay
patent: 5301761 (1994-04-01), Fu et al.
patent: 5407021 (1995-04-01), Kane et al.

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