DRILL BIT

摘要

A hammering and rotatable drill bit, which is meant for ground and rock drilling includes a hollow shaft having a hole that is adjusted to direct flushing air onto the drilling surface to the front of the drill bit and further from there towards the outer edge of the drill bit. the drill bit includes a drilling part which protrudes from the surface of the drill bit, functions as a drill point and drills the mid-area of the hole to be created wherein the mentioned part is adjusted to prevent the flushing flow from flowing directly through the mentioned hole located inside the shaft onto the drilling surface. The mentioned part is arranged to allow the outlet of the flushing flow in a sideways direction to the grooves belonging to the drilling surface, which grooves lead to the edge of the drill bit ,and is arranged to allow the outlet also partly to the front of the drill bit to the drilling surface by adjusting the groove, which leads to the edge of the drill bit, to start from the mentioned part from such a distance (d) from the centre line (L) of the drill bit which distance (d) is less than the radius (R) of the hole.

主权项

1. Hammering and rotatable drill bit, which is meant for ground and rock drilling, said drilling device comprising a hollow shaft, said shaft having a hole which is adjusted to direct flushing air onto the drilling surface to the front of the drill bit and further from there towards the outer edge of the drill bit wherein the drill bit comprises a drilling part which protrudes from the surface of the drill bit, functions as a drill point and drills the mid-area of the hole to be created wherein the mentioned part is adjusted to prevent the flushing flow from flowing directly through the mentioned hole located inside the shaft onto the drilling surface, wherein the mentioned part is arranged to allow the outlet of the flushing flow in a sideways direction to the grooves belonging to the drilling surface which grooves lead to the edge of the drill bit and is arranged to allow the outlet also partly to the front of the drill bit to the drilling surface by adjusting the groove, which leads to the edge of the drill bit, to start from the mentioned part from such a distance from the centre line of the drill bit which distance is less than the radius of the hole of the flushing duct.