Molding machine

Abstract

A molding machine has a base, a pattern provided with a plurality of vent bores formed therethrough and mounted on the base, a molding flask arranged to be combined with the pattern, an upset frame superposed to the molding flask, cover means for making an airtight contact at its lower end with the upper surface of the base, molding flask or of the upset frame. Further, compressed air supplying means are provided for supplying compressed air into the closed space defined by the pattern, the molding flask and the upset frame, the space being filled with molding sand. The cover means include a cylindrical member and cover member. The cylindrical member slidably fits to the outside of the cover member in a telescopic manner, and is provided at its lower end with an inwardly projected flange. In operation, the compressed air for compacting the molding sand acts also on the upper surface of the flange of the cylindrical member so as to depress the latter downward into airtight contact with the upset frame or the like. Consequently, the clamping cylinders, which have been essential in the conventional machine for preventing the floating of the cover means, are completely eliminated to simplify the construction of the molding machine.