Abstract: A bit includes a body portion having a first shape, a first length, a first end and a second end. A collar portion having a second shape, a thickness, a first surface disposed adjacent a second end of the body portion and a second surface forming a ledge for seating against a surface of a rotary cutting head of a mining machine. A shank portion, has a diameter and a second length. A first end of the shank is secured to the second surface of the collar portion. A groove formed around the shaft portion closely adjacent the second end thereof. A bit tip disposed adjacent the first end of the body portion to contact a hard surface. The bit tip tapers to a pointed end. A connecting means is disposed in the groove for connecting the bit to the working machine. A plurality of fins is disposed along an outer surface of the body portion.

Abstract: A drill bit consists of a bit body having a forward end and a slot in the forward end to hold a hardened cutting blade. The blade has a central slot extending into the forward end thereof such that the slot defines inner side wails and a bridge extending between the inner side walls. A protrusion along the leading face of each of the cutting sides of the blade with each protrusion extending to the forward edge extends the length of the cutting edges and by distributing the load along a greater length reduces the stress to the cutting edge. Protrusions along the trailing face of the blade also extern to the cutting edge and increase the strength of the blade.

Abstract: A drill bit consists of a bit body having a forward end and a slot in the forward end to hold a hardened cutting blade. The blade has a central slot extending into the forward end thereof such that the slot defines inner side wails and a bridge extending between the inner side walls. A protrusion along the leading face of each of the cutting sides of the blade with each protrusion extending to the forward edge extends the length of the cutting edges and by distributing the load along a greater length reduces the stress to the cutting edge. Protrusions along the trailing face of the blade also extern to the cutting edge and increase the strength of the blade.