Title: Apparatus for drilling holes in earth surface

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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Inventors: Tsiferov, Mikhail Ivanovich (ULIT, SA)

Application Number: 568183
Filing Date: 1975-04-15
Publication_date: 1976-01-27
Assignee:
Primary Class(es): 175/14 60/267, 175/15, 175/17, 175/93, 175/307, 175/318
Other Classes:
US Patent Ref:

1661091	Feb, 1928	Riabouchinski	175/6.
2218130	Oct, 1940	Court	175/422.
3216320	Nov, 1965	Thomas et al.	175/4.
3345879	Oct, 1967	Nasu et al.	175/6.
3386521	Jun, 1968	Chadderdon	175/422.
3389759	Jun, 1968	Mori et al.	175/422.
3467211	Sep, 1969	Goodwin et al.	175/422.
3502161	Mar, 1970	Coman	175/4.
3620313	Nov, 1971	Elmore	175/93.
3881561	May, 1975	Pols et al.	175/422.

Other Refs:
Primary Examiner: Abbott, Frank L.
Assistant Examiner: Favreau, Richard E.
Attorney: Holman & Stern