tip drill for excavation in a coal mine.

摘要

A mining drill bit (10) which has a cylindrically shaped body (12) within which a shank end (14) includes a shank bore (16) that communicates with the shank head (24) via a diametrically disposed slot (30) that intersects at approximately 35o a second diametrially disposed head slot (26) which in turn carries a cutting element (28) such that dust and other debris created during the drilling operation will be carried through the open slot.