DEVICE FOR ROTARY DRILLING OF BLAST HOLES Russian patent published in 1996 - IPC

Abstract RU 2053345 C1

FIELD: mining industry. SUBSTANCE: device for rotary drilling of blast holes has drill, rod with single-cut helical rib and bit. In this case, single-cut helical rib has end face engageable with supporting area on external surface of bit. Supporting area is formed by cutting helical rib by plane square to working surface of helical rib in point of its coming beyond the rod end. End face forms obtuse angle with external surface of helical rib. Part of rod located in drill chuck is kinematically connected with drill by means of cylindrical straps for transmitting torque from chuck to rod. EFFECT: higher efficiency. 2 cl, 3 dwg

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RU 2 053 345 C1

Authors

Shamshin Vladimir Nikolaevich

Dates

1996-01-27—Published

1992-05-26—Filed