Boring or penetrating the earth – With tool shaft detail
Patent
1985-11-22
1987-10-27
Leppink, James A.
Boring or penetrating the earth
With tool shaft detail
279 193, F21B 1700, B23B 3104
Patent
active
047023287
ABSTRACT:
A roof-drilling system for use in subterranean mining applications and the like in which the drill head of a roof drilling machine is arranged such that the receiving cavity of its chuck is configured having lost motion association with the drive-in portion of starter and driver drill steel rods. The lower surface of a retainer fixed to the drill head and having a non-circular aperture formed therein serves to define one bearing surface for utilizing the drill head itself to pull the assemblage of drill steel from a completed bore. To remove the drill steel driver component from the drill head chuck, the miner grasps the lowermost portion and rotates it a relatively small amount. To provide for interlocking of various components of the drill steel, i.e. driver component, extension components finishing rods and the like, the tips of the male ends of each component are formed having a shallow external groove and each corresponding female socket is provided with a corresponding transversely oriented mirror image bore. Conventional wire or its equivalent is inserted within the bore by the miner in the course of assembling the drill steel during a drilling operation.
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"Coming Soon--New Mining Concepts and Equipment for Improved Safety and Production Capabilities", Coal Age, vol. 78, pp. 137-143, Jul. 1973.
McSweeney Larry J.
McSweeney Lawrence H.
Bagnell David J.
Leppink James A.
Millard Sidney W.
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