Abstract: An apparatus for cutting lengths of material is provided having a pair of scroll type cams adapted to operate a pair of laterally opposed cutting blades. The apparatus comprises a frame having a front end, a rear end, and generally parallel side members laterally opposed to each other and spaced apart by a plurality of rollers extending generally perpendicular between the parallel side members of the frame. The pair of laterally opposed cutting blades are pivotally connected to the front end of the frame. The blades are constructed from a metallic material, the surfaces of which may be heated electrically to facilitate cutting. The scroll type cams are rotatably mounted to each side of the frame near the ends of the cutting blades and are adapted to engage cam followers connected to the blades. Pneumatically operated cylinders simultaneously rotate each of the scroll cams in the same direction with respect to the frame to convert rotational motion of the cams to linear motion of the cam followers.

Abstract: A tread design for a radial tire provides a tread block pattern that reduces the treadwear of the tire. The tread design comprises a plurality of blocks cooperatively formed by circumferential grooves extending around the tire and angularly oriented transverse grooves intersecting the circumferential grooves. The blocks are preferably arranged in three circumferentially extending ribs, wherein each rib is separated from another by a circumferential groove. Each individual block is separated from an adjacent block by a straight transverse groove. Each transverse groove extends at an angle of about 40.degree. to 60.degree. with respect to the circumferential plane of the tire, with the preferred angle being approximately 45.degree.. The tread pattern on the left side tire is the mirror image of the tread pattern on the right side tire.