Mining drill sheels

Abstract

Mining drill steels have their flat engaging surfaces at their ends and a component part having a matching internal surface is press-fitted onto the end of the drill steel.

What is claimed as new and desired to be secured by Letters of Patent is:  
     
         1 . A drill steel member for a roof drilling system used in the mining industry, said drill steel member comprising: 
 a body formed from a steel tube having a first uniform outer diameter;    a first machined end integral to said body, said first machined being devoid of threads and having an external shape and a first outer dimension smaller than said first uniform outer diameter of said body;    a component part comprising an aperture formed therein, said aperture having an internal shape corresponding to said external shape of said first machined end, said aperture having an inner uniform dimension less than said first outer dimension of said first end; and    wherein said component part is coupled to said first machined end by a press-fitting engagement.    
     
     
         2 . A drill steel member for a roof drilling system used in the mining industry, said drill steel member comprising; 
 a body formed from a steel tube having a first uniform outer diameter;    a first machined end integral to said body, said first machined end being devoid of threads and having an external shape and a first outer dimension smaller than said first uniform outer diameter of said body; and    a component part comprising an aperture formed therein, said aperture having an internal shape corresponding to said external shape of said first machined end, said aperture having an inner uniform dimension less than said first outer dimension of said first end; and,    wherein said component part is coupled to said first machined end by a press-fitting engagement.