Rotary cutting bit with material-deflecting ledge

Details Rotary cutting bit with material-deflecting ledge Rotary cutting bit with material-deflecting ledge

E - Fixed Constructions

21

B

E21B 10/46 (2006.01) E21C 35/183 (2006.01) E21C 35/18 (2006.01)

Patent

CA 2492678

A cutting bit includes a body having a front surface and a side surface, the side surface including a shoulder below the front surface and extending substantially perpendicular to a central axis of the body, and a ring that is harder than the body attached to the body at a front surface of the shoulder. Wear life of the cutting bit is enhanced by maintaining particular dimensional relationships regarding the position of the ring on the body, and the diameter of portions of the body.

L'invention concerne un trépan tranchant comprenant un corps doté d'une surface avant et d'une surface latérale, ladite surface latérale comprenant un épaulement situé sous la surface avant et s'étendant sensiblement perpendiculairement à un axe centrale du corp; et une bague plus dure que le corps fixée audit corps au niveau d'une surface avant de l'épaulement. La durée de vie du trépan tranchant est prolongée par maintien de relations dimensionnelles particulières relatives à la position de la bague sur le corps et au diamètre des parties du corps.

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