Boring or penetrating the earth – Processes
Patent
1975-10-01
1977-04-26
Leppink, James A.
Boring or penetrating the earth
Processes
175320, E21B 1700
Patent
active
040195902
ABSTRACT:
An assembly for drilling a hole in a roof to a greater depth than the height of the chamber therebelow includes a starter-driver bar having a first end adapted to be driven by a motor and a second end having a female socket therein, a rod extension including a male end shaped to be received in said female socket and a female socket at its other end of the same cross-sectional size and shape as the first named female socket, and a bit having a male shank of the same cross-sectional shape as said male end. A starter hole is first drilled using the starter-driver with the drill bit in its top and a motor connected to its lower end. Drilling then is continued with an assembly consisting of a first rod extension between the bit and starter-driver. Additional rod extensions are inserted between the starter-driver and the bottom rod extension until a hole of the desired depth is obtained.
REFERENCES:
patent: 2757906 (1956-08-01), Ryd
patent: 2771273 (1956-11-01), Pond
patent: 3187825 (1965-06-01), Bower
patent: 3218893 (1965-11-01), Madison et al.
patent: 3460638 (1969-08-01), Millsapps
patent: 3519091 (1970-07-01), Leibee et al.
patent: 3554306 (1971-01-01), Wilburn
patent: 3604754 (1971-09-01), Hosel et al.
patent: 3774556 (1973-11-01), Poll
patent: 3830318 (1974-08-01), Busby et al.
patent: 3840272 (1974-10-01), Crane et al.
Hansen Lloyd B.
Smarrella Eugene R.
Carmet Company
Dropkin Robert F.
Gioia Vincent G.
Leppink James A.
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