DRILLING TOOL Russian patent published in 1994 - IPC

Abstract RU 2012814 C1

FIELD: mining industry; blast hole drilling. SUBSTANCE: drilling tool is provided with a guiding bushing disposed on a drilling string inner section for longitudinal motion. A hole in a rest is made congruent to guiding bushing surface. The bushing may be installed and fixed in the rest hole. EFFECT: enlarged operating capabilities. 2 cl, 4 dwg

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RU 2 012 814 C1

Authors

Chikin V.G.

Andrejchenko G.M.

Dates

1994-05-15—Published

1991-02-25—Filed