Boring or penetrating the earth – With means movable relative to tool or shaft to control...
Patent
1989-06-30
1990-12-04
Britts, Ramon S.
Boring or penetrating the earth
With means movable relative to tool or shaft to control...
175321, F21B 2100
Patent
active
049746901
ABSTRACT:
An adaptor for drilling strings has a head, sleeve and mounting block assembly to secure a drill bit to a drilling string. By reverse rotation of the drilling string, the sleeve is movable between a first position, where pressurized air from the drilling string is directed to the drill bit, to a second position, where the air is directed to the drill hole above the adaptor to clear debris from the hole. Teeth at both ends of the assist the adaptor to clear the hole as the drill drill string is rotated and retracted from the hole.
REFERENCES:
patent: 2869828 (1959-01-01), McClinton
patent: 2906493 (1959-09-01), Whitener
patent: 3371729 (1968-03-01), Carr
Bagnell David J.
Britts Ramon S.
S&T No 13 Pty. Ltd.
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