Boring or penetrating the earth – With tool shaft detail
Patent
1976-05-06
1977-03-01
Novosad, Stephen J.
Boring or penetrating the earth
With tool shaft detail
175393, 175422, 285 14, E21B 1700, E21B 1704, E21C 1500
Patent
active
040097609
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:
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patent: 2263579 (1941-11-01), Hokanson
patent: 2693345 (1954-11-01), Martin et al.
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patent: 2979141 (1961-04-01), Kandle
patent: 3187825 (1965-06-01), Bower, Jr.
patent: 3304816 (1967-02-01), Galorneau
patent: 3341237 (1967-09-01), Anzalone
patent: 3519091 (1970-07-01), Leibee et al.
patent: 3554306 (1971-01-01), Wilburn
patent: 3722604 (1973-03-01), Lesher
Hansen Lloyd B.
Smarrella Eugene R.
Carmet Company
Dropkin Robert F.
Gioia Vincent G.
Novosad Stephen J.
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