FIELD: mining, equipment.
SUBSTANCE: present invention relates to a drill bit, in particular for the drilling of rock, to drill rods and to bolts of the type known as rock or roof bolts and to such bolts of the self drilling kind. Said drill bit includes means for attachment to an end of said drill rod, a leading end which defines a pair of diametrically opposed slots, which open axially for receipt of a portion of a drill tip which projects axially from said slots. Said drill tip being fixedly secured within each of said slots. Moreover, said drill rod or self drilling roof bolt has an elongated body with a central bored hole.
EFFECT: improving the reliability and reducing the time of mine roof bolting.
13 cl, 4 dwg
