CROWN BIT FOR ROTARY-PERCUSSION DRILLING Russian patent published in 2003 - IPC

Abstract RU 2201490 C1

FIELD: mining industry, rock-breaking tools. SUBSTANCE: crown bit for rotary-percussion drilling has shank and working head divided in butt part by cruciform cutting into blades. Shank and working head come monolithic with unit-cast working blades which have semi- toroidal active surface changing over to truncated cone. EFFECT: raised drilling efficiency, reduced manufacturing cost of crown bit. 3 dwg

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RU 2 201 490 C1

Authors

Klimov B.G.

Gil'Janova L.N.

Matveeva L.I.

Dates

2003-03-27—Published

2001-06-29—Filed