Abstract: Provided is a rubber crawler 10 in which a rubber lug 11 is formed on an outer circumferential side of an endless rubber elastic body, cores 12 are disposed in the rubber elastic body at a constant pitch in a crawler circumferential direction, and sprocket engaging holes 13 to be engaged with sprockets S are formed between cores 12 adjacent to each other in the crawler circumferential direction. The sprocket engaging holes 13 are provided with a rubber film 14, which has a shape protruding toward a crawler inner circumferential side.

Abstract: A rubber article mold capable of discharging air from a molding-surface side to a back-surface side during curing while suppressing the entry of rubber into an air vent hole and a method for producing such a rubber article mold are provided. The rubber article mold includes air discharge means for discharging air from a molding-surface side for molding a rubber article to a back-surface side. The air discharge means is formed as an annular hollow penetrating from a molding surface to a back surface of the rubber article mold. The annular hollow has an inflow area where the air on the molding-surface side flows in, a discharge area for discharging the air having flowed in from the inflow area to the back-surface side, and an intermediate area communicating with the inflow area and the discharge area and smaller or larger in diameter than the inflow area and the discharge area.

Abstract: A rubber article mold capable of discharging air from a molding-surface side to a back-surface side during curing while suppressing the entry of rubber into an air vent hole and a method for producing such a rubber article mold are provided. The rubber article mold includes air discharge means for discharging air from a molding-surface side for molding a rubber article to a back-surface side. The air discharge means is formed as an annular hollow penetrating from a molding surface to a back surface of the rubber article mold. The annular hollow has an inflow area where the air on the molding-surface side flows in, a discharge area for discharging the air having flowed in from the inflow area to the back-surface side, and an intermediate area communicating with the inflow area and the discharge area and smaller or larger in diameter than the inflow area and the discharge area.

Abstract: A rubber article mold capable of discharging air from a molding-surface side to a back-surface side during curing while restraining entry of rubber into an air vent hole and a method for producing such a rubber article mold are provided. The rubber article mold including portions for discharging air from a molding-surface side to a back-surface side, including a hole penetrating from a molding surface to a back surface of the mold and a valve member within the hole to provide a predetermined clearance between the valve member and a hole wall forming the hole. The hole has an inflow area where the air on the molding-surface side flows in, a discharge area for discharging the air flowed in from the inflow area to the back-surface side, and an intermediate area smaller in diameter than the inflow area and the discharge area and communicating with the inflow and discharge areas.