Drill bit stabilizer device

Abstract

A stabilizing sleeve device for an impact drill bit used in underground drilling operations. The cylindrical tubular device has arcuate keys on a bottom edge for interlocking with keyways in the shoulder of a hammer drill bit and a locking key groove in its top edge.

I claim:  
     
         1 . A drill bit stabilizer device system comprising: 
 a cylindrical metal tube having a top edge and a bottom edge;    said top edge having a locking key groove in an inner surface;    said bottom edge having a plurality of substantially equidistantly spaced arcuate keys in an inner surface; and    a shoulder of an underground hammer drill bit head having a plurality of substantially equidistantly spaced arcuate keyways for interfitting the keys in the cylindrical metal tube, for stabilizing a hammer drill bit during a downhole drilling process.    
     
     
         2 . The drill bit stabilizer device according-to  claim 1 , including a locking key groove on an inner surface of a top edge of the cylindrical metal tube adapted for access to the locking and unlocking of the hammer drill bit in the chuck.  
     
     
         3 . The drill bit stabilizer device according to  claim 1 , wherein the number of keyways and keys is three.