Abstract: A molding sand preparation apparatus of the mixing-bowl type is suitable for preparing face sand or back sand without structural modification. The apparatus includes sand hoppers and resin and catalyst tanks as well as pumps, controls and the like for measuring proper amounts of sand, resin and catalyst and placing them into a mixing bowl equipped with rotatable agitating blades. The bowl includes flexible mixing blades, the position of which can be adjusted for changing the mixing efficiency of the apparatus.

Abstract: The improved molding machine is constructed such that a match plate having molding portions is clamped between upper and lower molding boxes. Molding sand carried by compressed air is introduced into each of the upper and lower molding boxes. Compressed air (which is devoid of sand) is blown from the under side of the lower molding box so that the molding sand may be evenly deposited on the under surface of the molding portions of the match plate.

Abstract: An apparatus for kneading particulate to granular materials comprising a container in the form of a bottomed hollow cylinder, a vertical shaft disposed in the center of interior of the container and rotatable by a motor assembly, pivotal arms mounted on the vertical shaft and turnable only upward and downward, agitating rolls rotatably supported by the pivotal arms each at one end of the arm and each having a recessed outer peripheral pressing surface, and pressure adjusting assemblies each provided between the vertical shaft and the other end of each of the pivotal arms, the pressure adjusting assembly comprising a cylinder member, a rod and means housed in the cylinder member for biasing the rod in directions opposite to each other.