| Patent Number |
Title Of Patent |
Date Issued |
| 7207400 |
Coupler and roof drill bit assembly using such coupler |
April 24, 2007 |
| A coupler for use in connecting together in a driving relationship a first member and a second member in a drill bit assembly. The coupler includes an elongate body that has opposite axial forward and rearward ends as well as contains a longitudinal bore. The elongate body further has a |
| 6945340 |
Roof bit and insert assembly |
September 20, 2005 |
| A center vacuum rotary drill bit including a rotary drill bit body and an insert. The bottom surface of the slot has a projecting key that cooperates with a depression keyway of the insert. Generally vertical sidewall surfaces of a depression keyway and vertical surfaces of a project |
| 6915867 |
Earth penetrating rotary drill bit with helical ports |
July 12, 2005 |
| A drill bit that has a drill bit body with a side wall and opposite ends. A distal one of the opposite ends of the drill bit body receives a cutting insert. The drill bit body contains at least two helical debris ports in the side wall thereof. The drill bit body further contains a helic |
| 6886645 |
Liquid seal for wet roof bit |
May 3, 2005 |
| Fluid roof bits for mining typically supply high pressure water to a location immediately adjacent the cutting insert 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 suppl |
| 6860344 |
Monolithic roof cutting bit insert |
March 1, 2005 |
| A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward end thereof. The hard insert |
| 6684968 |
Roof bit body and insert assembly |
February 3, 2004 |
| A center vacuum rotary drill bit including a rotary drill bit body and an insert. The bottom surface of the slot has a projecting key that cooperates with a depression keyway of the insert. Generally vertical sidewall surfaces of a depression keyway and vertical surfaces of a project |
| 6595305 |
Drill bit, hard member, and bit body |
July 22, 2003 |
| A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward end thereof. The hard insert |
| 6244665 |
Cutting toolholder with recessed groove for cutting tool removal |
June 12, 2001 |
| A toolholder for securing a cutting tool used for mining and construction applications whereby the holder has a recessed groove to provide access to the underside of a flange on the cutting bit to promote removal of the cutting tool from the toolholder. |
