BORE CONE BIT Russian patent published in 2009 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: invention refers to equipment of rock destroying tool, particularly to hard-alloy teeth designed for equipment of bore bits. The bore bit consists of one or more sections with a leg, and of a roller cutter movably secured on the leg and equipped with hard-alloy teeth with cylinder tails and a working rock-destroying head in form of converging on a rounded top crests. A pyramidal working head in sections below the rounded top has a shape of trapezium with rounded angles. Radius of rounding of the top of the working head of the tooth is bigger or equal to product of one sixteenth of diametre of a cylinder part of the tooth and number of facets of trapezium working head of the tooth and is bigger or equal to radius of rounding of ribs of the working head of the tooth. The teeth are arranged on crowns in the case of a roller cutter where relative to the direction of the roller cutter rotation a bigger side of pyramid base is oriented on trailing edge and smaller side is oriented on entering edge.

EFFECT: increased efficiency of bore bit operation due to increased efficiency of operation of hard-alloy rock destroying teeth.

2 cl, 8 dwg