Rock drilling head

Abstract

A rock drilling head ( 1 ) with a drilling diameter (D) between 25 mm and 60 mm and formed of no more than five separate parts, has at least one rinsing channel ( 2 ) formed in the outer surface ( 3 ) of the drilling head and expanding from the outer surface ( 3 ) inward in form of a nozzle, the rinsing channel having a diameter (S) amounting to between 1/20 and ⅕ of the drilling diameter (D).

1 . A rock drilling head having a drilling diameter (D) between 25 mm and 60 mm and formed of no more than five separate parts, comprising an outer surface ( 3 ); and at least one rinsing channel ( 2 ) formed in the outer surface ( 3 ) and expanding from the outer surface ( 3 ) inward in form of a nozzle, and having a diameter (S) amounting to between 1/20 and ⅕ of the drilling diameter (D). 
   
   
       2 . A rock drilling head according to  claim 1 , wherein the rinsing channel ( 2 ) expands with a cone angle (α) between 3° and 30°. 
   
   
       3 . A rock drilling head according to  claim 1 , comprising a further rinsing channel ( 2 ). 
   
   
       4 . A rock drilling head according to  claim 1 , comprising a base member ( 4 ). 
   
   
       5 . A rock drilling head according to  claim 4 , wherein the base member ( 4 ) is formed as a steel casting. 
   
   
       6 . A rock drilling head according to  claim 4 , further comprising a hard material insert ( 5 ) extending diametrically over the drilling diameter (D) and secured in a groove ( 6 ) formed in the base member ( 4 ). 
   
   
       7 . A rock drilling head according to  claim 1 , comprising only one base member ( 4 ), and only one hard material insert ( 5 ) extending diametrically over the drilling diameter (D) and secured in a groove ( 6 ) formed in the one base member ( 4 ).