High-speed drill for rock stake engineering

Details High-speed drill for rock stake engineering High-speed drill for rock stake engineering

1997-01-16

1998-10-20

Bagnell, David J.

Boring or penetrating the earth

Bit or bit element

Core forming type

125 20, 408 59, 408204, 451450, B23B 2710, E21B 1002, E21B 1060

Patent

active

058232753

ABSTRACT:
A high-speed drill for rock stake engineering includes an outer tube and an inner tube fixed in the outer tube, and an annular space is formed by the outer and the inner tube for pressured air and water to flow down from a power shaft connected with an upper portion of the outer tube. An annular cushion block is connected with a bottom of the outer and the inner tube, having many through holes. Further, cutters are fixed under a bottom surface of the cushion block, rotating together with the outer tube rotated by the power shaft, cutting into rock and cooled and washed synchronously by the pressured air and water coming through the annular space down from the power shaft.

REFERENCES:
patent: 3153885 (1964-10-01), Keller et al.
patent: 3424255 (1969-01-01), Mori et al.
patent: 5092716 (1992-03-01), Omi

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