Fluid operated drill apparatus

Details Fluid operated drill apparatus Fluid operated drill apparatus

1992-12-14

1994-06-07

Britts, Ramon S.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175298, 173 78, 173 80, E21B 414

Patent

active

053181409

ABSTRACT:
Down-the-hole drill comprising a housing (1), a hammer piston (6) movable to-and-fro in the housing and intended for impacting a drill bit (5). A back piece (3) provided with an extension (12) with a valve part (17) cooperates with a part (8) of a central channel in the hammer piston. This part of the central channel comprises a zone (16) with larger diameter than adjacent parts at an intermediate part of this part. This results in that pressure medium can pass the valve part when it is situated at the zone and that the valve part and the hammer piston sealingly cooperate when the valve part is on either side of the zone.

REFERENCES:
patent: 2837317 (1958-06-01), Hulshizer
patent: 2937619 (1960-05-01), Kurt
patent: 2951467 (1960-09-01), Morrison
patent: 3095047 (1963-06-01), Fleischer et al.
patent: 3379261 (1968-04-01), Martini
patent: 3692122 (1972-09-01), Curington
patent: 4819746 (1989-04-01), Brown et al.
patent: 4958691 (1990-09-01), Hipp
patent: 5139096 (1992-08-01), Lister

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