Cold-box resin-bonded foundry core-making machine

Claim 1

A cold-box core-making machine for producing resin-bonded foundry cores, comprising, in combination, a hopper containing sand of which the temperature and moisture content are controlled, the sand hopper having two timer-controlled outlet valves; two separate mixing devices to which controlled amounts of sand can be delivered from the respective hopper outlets; means for supplying resin to one of the mixing devices; means for supplying hardener to the other mixing device; two separate hoppers into which the segregated mixes are delivered; a final mixer for producing a homogeneous mixture of all the materials; timer-controlled outlet valve means by which the respective mixes are delivered to the final mixer; a blowing chamber in communication with the final mixer and serving a cold corebox; timer-controlled valve means for dispensing the final mix into the blowing chamber; and a timer-controlled valve effective to obturate communication between the final mixer and the blowing chamber before the final mixture is blown into the corebox.