CROWN BIT Russian patent published in 2004 - IPC

Abstract RU 2231615 C2

FIELD: rock destroying equipment engineering.

SUBSTANCE: device has body with connecting member and working portion, which is made with cleaning channels, fins, separated from each other by slurry-outlet grooves, and cylindrical core-forming hollow. Fins and bottom of cylindrical hollow are armored by hard-alloy teeth. Height of core-forming hollow - H_c is connected to height of slurry-outlet grooves - H_g and depth of grooves for hard-alloy teeth - H_t on fins by inequality: H_c<H_g<H_t. Diameter of core-forming hollow - d and crown - D - are connected by equation: d/D=0.4-0.6. Hard-alloy teeth on bottom of core-forming hollow are placed at different distances from axis of crown and with angular displacement relatively to slurry-outlet grooves to direction of crown rotation.

EFFECT: higher speed of boring, lower costs of boring operations.

4 cl, 2 dwg

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RU 2 231 615 C2

Authors

Chuvilin A.M.

Chuvilin M.A.

Dates

2004-06-27—Published

2002-05-28—Filed