Title: Apparatus for roof drilling

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.

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Inventors: Hansen, Lloyd B. (Bridgeport, WV, US)
Smarrella, Eugene R. (Shinnston, WV, US)

Application Number: 683986
Filing Date: 1976-05-06
Publication_date: 1977-03-01
Assignee: Carmet Company (Pittsburgh, PA)
Primary Class(es): 175/320 175/393, 175/424, 285/14
Other Classes:
US Patent Ref:

1894446	Jan, 1933	McKenny	175/62.
2263579	Nov, 1941	Hokanson	175/320.
2693345	Nov, 1954	Martin et al.	175/320.
2902832	Sep, 1959	Levy et al.	175/320.
2979141	Apr, 1961	Kandle	175/62.
3187825	Jun, 1965	Bowe, Jr.	175/320.
3304816	Feb, 1967	Galorneau	175/320.
3341237	Sep, 1967	Anzalone	175/320.
3519091	Jul, 1970	Leibee et al.	175/320.
3554306	Jan, 1971	Wilburn	175/320.
3722604	Mar, 1973	Lesher	175/320.

Other Refs:
Primary Examiner: Novosad, Stephen J.
Assistant Examiner:
Attorney: Gioia; Vincent G., Dropkin; Robert F.