Boring or penetrating the earth – Boring by directly applying heat to fluidize or comminute – Combustion is confined chamber having restricted discharge...
Patent
1975-04-15
1976-01-27
Abbott, Frank L.
Boring or penetrating the earth
Boring by directly applying heat to fluidize or comminute
Combustion is confined chamber having restricted discharge...
60267, 175 15, 175 17, 175 93, 175307, 175318, E21B 714, E21C 2100
Patent
active
039346595
ABSTRACT:
The apparatus is a rocket with a drill head provided with a group of jet nozzles. One nozzle of this group is the face-forming one, while the plurality of the rows of the rest of the nozzles belong to imaginary circles concentric with the longitudinal axis of the rocket. The spacing of the nozzles in each row equals 4 to 7 critical diameters of the jet nozzle of the respective row, while the spacing of any pair of the adjacent rows of the nozzles in a projection of the drill head upon a plane perpendicular to the longitudinal axis of the rocket is 4 to 7 times greater than the mean diameter of the nozzles of the said pair of rows of nozzles.
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patent: 3502161 (1970-03-01), Coman
patent: 3620313 (1971-11-01), Elmore
patent: 3881561 (1975-05-01), Pols et al.
Abbott Frank L.
Favreau Richard E.
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