Abstract: A tire rasp blade made with an arcuate shape and a plurality of sets of teeth at the outer working edge having recesses between each set of teeth. Each set of teeth is inclined in the same direction and is formed by two teeth, with the pair of teeth in each set separated by an inclined narrow slit which has a curved portion at its inner end and which extends inwardly beyond the depth of the recesses between the teeth. Each pair of teeth in each set is displaced laterally or angularly from each other and from the body of the rasp blade. Each tooth of each pair includes a leading edge and a trailing edge wherein the portion of the teeth edges near the outer edge of the blade body are substantially straight or curved.In another embodiment of the invention, clearing teeth are provided wherein each clearing tooth replaces a set of teeth at intervals of the teeth sets along the rasp blade of the rasp blades described above.

Abstract: Rasp blades for removing rubber from tire carcasses to prepare them for retreading. The improved blades have a unique arrangement of the teeth in the blade wherein a plurality of sets of teeth are formed in the working edge, and wherein each set is formed with two pairs of teeth disposed at opposite angles of inclination to each other, and with each pair having a lead tooth and a trailing tooth formed by a narrow tooth dividing slit therebetween which extends sufficiently inwardly beyond the depth of recesses on each side of the pairs of teeth to provide tooth settings which give greater strength and more effective cutting edge exposure.