Boring or penetrating the earth – With below-ground tool drive prime mover – Plural below-ground drive prime movers
Patent
1979-04-23
1981-12-08
Leppink, James A.
Boring or penetrating the earth
With below-ground tool drive prime mover
Plural below-ground drive prime movers
175215, 175 69, 175106, E21B 400
Patent
active
043043097
ABSTRACT:
A surface drilling apparatus for drilling large diameter holes in soft to medium-hard earth formations includes a cylindrical casing defined by a stationary upper section and a lower section rotatable relative to the upper section; a plurality of circular rows of cutting discs rotatably mounted on the base of the lower section for cutting material beneath the apparatus; a transfer pipe in the center of the base of the lower section for receiving cut material from the cutting discs and feeding the cut material upwardly through a discharge pipe for carrying the material upwardly to the surface; and an annular, upwardly inclined slot in the discharge pipe at the top of the upper section through which air is fed under pressure into the discharge pipe to induce the cut material upwardly from the transfer pipe and blow the material upwardly.
REFERENCES:
patent: 1512658 (1924-10-01), Woodruff
patent: 1547461 (1925-07-01), Steele
patent: 3077358 (1963-02-01), Costa
patent: 3161243 (1964-12-01), Davis
patent: 3338322 (1967-08-01), Henderson
patent: 3379264 (1968-04-01), Cox
patent: 3431989 (1969-03-01), Waterman
patent: 3596722 (1971-08-01), Allard
patent: 3770067 (1973-11-01), Ikeda
patent: 3807514 (1974-04-01), Murrell
patent: 4102415 (1978-07-01), Cunningham
Bradley Douglas W. L.
Fercho Edward
Shears Dennis
Dome Petroleum Limited
Favreau Richard E.
Leppink James A.
LandOfFree
Surface drilling apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface drilling apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface drilling apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-564048