Coal cutting bit having carbide insert

Claim 1

A BIT FOR COAL CUTTING CHAINS COMPRISING A BAR OF STEEL HAVING A RECTANGULAR SHANK AND A CUTTING HEAD HAVING A V-SHAPED NOTCH TRANSVERSE ITS EXTREMITY AND OPENING THROUGH THE FORWARD FACE OF SAID HEAD, SAID NOTCH DEFINING A PAIR OF FLAT WALLS EACH EXTENDING TO AN EXTERNAL SURFACE OF SAID HEAD AND MEETING AT AN ACUTE ANGLE, THE FRONT SAID WALL INCLINING FORWARDLY AND TOWARD SAID EXTREMITY AT AN ACUTE ANGLE TO A PLANE PARALLEL WITH THE LONG AXIS OF SAID BAR AND EXTENDING FROM THE BASE OF SAID NOTCH TOWARD SAID EXTREMITY, AND THE REAR SAID WALL INCLINING REARWARD AND TOWARD SAID EXTREMITY AT AN ACUTE ANGLE TO SAID PLANE, A TUNGSTEN CARBIDE INSERT BRAZE BONDED TO BOTH SAID WALLS, SAID INSERT PROJECTING FROM SAID NOTCH AND BEING DEFINED IN THE SIDE ELEVATION BY LINES OF A RIGHT ANGLE TRIANGLE OF WHICH THE HYPOTENUSE IS THAT FACE OF SAID INSERT WHICH IS BONDED TO THE FRONT WALL OF SAID V-SHAPED NOTCH.