Roof drilling system

Details Roof drilling system Roof drilling system

1978-11-06

1980-10-07

Leppink, James A.

Boring or penetrating the earth

With tool shaft detail

173 38, 279 193, E21B 1700, E21C 100

Patent

active

042262909

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 a 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, for example about 1/8 turn. To provide for interlocking of the various components of the drill steel, i.e. driver component, extension components finishing rods and the like, the tip of the male ends of each component are formed having a shallow groove and each corresponding female socket is provided with a corresponding transversely oriented 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.

REFERENCES:
patent: 1208224 (1916-12-01), Smith
patent: 2128934 (1938-09-01), Gartin
patent: 3519091 (1970-07-01), Leibee et al.
patent: 3822074 (1974-07-01), Welcker
patent: 4086972 (1978-05-01), Hansen et al.
patent: 4145076 (1979-03-01), Snow

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