LIQUID SEAL FOR WET ROOF BIT

摘要

Fluid roof bits for mining typically supply high pressure water to a location immediately adjacent the cutting insert (52) of the roof bit to flush debris and cool the cutting insert. The present invention is a drill steel assembly for a wet roof bit that reduces the fluid pressure loss supplied to the roof bit. A drill head body (54) is connected to the drill steel by an intermediate adaptor (58). The adaptor has a spring loaded button (62) thereon that mates with an opening in the drill head body so that the drill head body (54) can be conveniently snapped onto the drill head assembly. A bushing seal (56) made from a flexible material is clamped between said drill steel adaptor and the drill head body to limit fluid pressure losses.