Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
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
Ekwall Berndt
Jakobsson Torbjorn
Peterson Martin
Britts Ramon S.
Stone Mark P.
Tsay Frank S.
Uniroc AB
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