Molding apparatus with a compressed air squeeze plate

Abstract

A molding apparatus having a pattern plate provided with vent through bores, a mold flask adapted to be placed on the pattern plate, an up-set frame adapted to be carried by the mold flask, a cover plate covering the upper end opening of the up-set frame, a squeeze plate disposed in the cover and movable into the up-set frame, and compressed air supplying means adapted to introduce compressed air into the space in the mold flask. After filling the space in the mold flask with the molding sand, the compressed air is introduced into the space in the mold flask by means of the compressed air supplying means. The air flows through the molding sand toward the vent through bores formed in the pattern plate so that the molding sand particles are packed and consolidated in the area around the vent through bores. Then, a squeezing is effected on the molding sand by mechanically or pneumatically depressing the squeeze plate so as to form a mold having sufficient molding condition and even compactness, without necessitating jolting action which has been indispensable in the conventional molding apparatus.