Abstract: A vibrating apparatus for vibrating a flask to compact molding sand in the flask, including an elastically supported vibrating table on which a flask is placed and two unbalanced-weight-type motors mounted on the vibrating table at the sides of the flask for vibrating it by rotating the unbalanced weights of the motors. The axes of rotation of both motors are located on a horizontal line that substantially passes the centroid of the entire elastically supported vibrating apparatus, including the vibrating table, the two motors, the flask, and the molding sand in the flask. Further, both unbalanced weights of the motors are rotated at a speed in one direction.

Abstract: A support table for foundry sand molding machines is elevated from a lowermost position to a sand supply position wherein sand is fed into a flask supported on the table. The table is then moved downwardly to a predetermined position slightly above the lowermost position while being vibrated to compact the sand. The table is then elevated to an upper position for squeezing the sand against a squeeze board carried by a head on the machine.

Abstract: Foundry molds may be compressed and vibrated between a vibration table and a presser plate within apparatus which is structured to enable connection of the vibration table and the presser plate as a rigid frame during the compression and vibration process. The coupling means forming the rigid frame include locking means which may be actuated between a locked and an unlocked position whereby a gap may be formed when the coupling means are in the unlocked position to enable foundry molds to be swung in place by horizontally extending arms to effect location of the foundry molds between the vibration table and the presser plate. Damper means are also provided which damp and limit the movement of the presser plate and its associated pressure applying means in both an upward and a downward direction.