Patent ID: 7131709

Claim:
A core bar for a rubber crawler, including: right and left wing parts; an engaging part for drive connecting the right and left wing parts; right and left protrusions formed on opposite sides of the engaging part to guide a rolling wheel; and right and left outside rails disposed on outer sides of the right and left protrusions with respect to a center of the core bar in the lengthwise direction thereof, respectively, each of the outside rails having an overhanging part extending in the widthwise direction of the wing part, wherein the right and left outside rails each have a rail surface for engaging an outside collar of the rolling wheel, the rail surface being formed to have a greater height than the wing parts in the thickness direction thereof and to continue from a first end to a second end of the wing parts in the widthwise direction thereof, wherein the overhanging part is formed with an edge portion extending from the wing part, the edge portion having a slanting surface slanting substantially downwardly toward an end of the overhanging part from a top surface of the outside rail so that the outside collar of the rolling wheel transfers to a next rail surface, wherein each of the right and left outside rails has the overhanging part extending only on one of the front and the rear sides in the widthwise direction of the wing part, the overhanging parts of the right and left outside rails being arranged to extend in opposite directions relative to each other, and wherein the downwardly slanting surface of the edge portion is curved to form a convex surface.