DRILL Russian patent published in 2014 - IPC B23B51/00 B28D1/14 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and can be used for drilling holes in stones, concrete etc, for anchor bolts. This drill comprises cutting part with at least three noses spaced apart at drill far end in circle. Every section of said nose has front and rear faces making a connection ridge that serves as a cutting nose and drill body with its far end surface welded to drill cutting part near end to make drill body revolve jointly with drill cutting part. Drill body has dust suck-off channel extending there along so that its far end extends to drill body far end section. Extra dust suck-off channel is made at drill body far end section to extend from dust suck-off channel perpendicularly while extra dust suck-off channel radially outer end is exposed at drill body outer peripheral surface. Drill bit cutting part near end is wholly welded to drill bit far end surface.

EFFECT: better joint between cutting part and drill body.

4 cl, 12 dwg