CHISEL FOR STRIKING-ROTARY DRILLING Russian patent published in 2005 - IPC

FIELD: mining industry.

SUBSTANCE: chisel has body with hard-alloy rock-destroying shelves on its end, height of which increases from periphery to center. Together with body central leading rock-destroying shelf is made, provided with hard-alloy insert, and peripheral shelves are made with height directly proportional to distance from chisel center and reversely proportional to their number and diameter. Side portion of body is provided with calibrating inserts, placed at even distance from chisel center with peripheral rock-destroying means. Calibrating inserts are made tungsten-cobalt.

EFFECT: higher durability.

2 cl, 2 dwg