Patent ID: 8636049

Claim:
A flaskless molding machine comprising: four pairs of upper and lower flasks, each pair comprising an upper flask and a lower flask, the upper flask and lower flask having an opening and a port for introducing molding sand that is formed on respective side walls of the upper flask and the lower flask; a device for pivoting the flasks for pivoting the four pairs of upper and lower flasks so as to move the upper and lower flasks via at least four stations, including a molding station, a first station for placing a core, a second station for placing a core, and a station for extracting molds; a match plate to be inserted into, and taken out from, a gap between the pair of the four pairs of the upper and lower flasks that is located at the molding station; a pair of squeeze plates that are inserted through the openings of the pair of upper and lower flasks, respectively, while the match plate is clamped by the upper and lower flasks, so as to form an upper mold cavity and a lower mold cavity; a storage tank for sand having a pair of nozzles for introducing molding sand that are formed downwardly from a bottom of the tank; a device for moving the upper flask and lower flask forward and backward around an axis so that the ports for introducing molding sand receive the molding sand from the pair of nozzles for introducing molding sand; a squeezing device for moving the pair of squeeze plates toward the match plate so as to squeeze the molding sand in the upper and lower mold cavities, and for moving the pair of squeeze plates for forming the upper and lower mold cavities, the squeezing device being moved around the axis by the device for moving forward and backward around an axis, the molding sand having been filled in the upper and lower mold cavities; a device for moving the upper and lower flasks to have them retract from each other so that the match plate is separated from an upper mold and a lower mold and to have them come close to each other, the upper and lower molds being formed in the upper and lower mold cavities, respectively; and a device for extracting the molds from the upper and lower flasks while the upper and lower molds are stacked, the upper and lower molds having been formed in the upper and lower flasks, the upper and lower flasks having been moved to the station for extracting the molds via the first and second stations for placing a core by the device for pivoting the flasks, the upper and lower flasks containing the molds from which the match plate is separated, wherein the device for pivoting the flasks is equipped with a revolute joint that connects an air-supplying tube or a hydraulic tube to a rotary portion so that the rotary portion continually rotates in one direction when the device for pivoting the flasks moves the upper and lower flasks via the at least four stations.