System for cooling foundry sands in process

Claim 1

APPARATUS FOR PROCESSING MASSED GRANULAR PARTICLES TRANSPORTED ON A REACH OF A CONVEYOR HAVING TWO STATIONS SPACED APART ALONG THE PATH OF TRANSPORT WHICH COMPRISES: MEANS FOR SUPPLYING A MASS OF THE PARTICLES TO THE CONVEYOR REACH; A GROUP OF INDIVIDUALLY RESPONSIVE THERMISTOR-TYPE TEMPERATURE SENSING ELEMENTS DISPOSED NEAR THE CONVEYOR IN TEMPERATURE SENSING RELATION WITH THE PARTICLES IN TRANSIT ON THE REACH AT THE FIRST STATION; MEANS FOR APPLYNG COOLANT TO THE PARTICLES ON THE REACH AT THE SECOND STATION; A GROUP OF INDIVIDUALLY RESPONSIVE COOLANT ADMITTING VALVES, EACH VALVE HAVING ONLY A COMPLETELY OPEN STATE AND A COMPLETELY CLOSED STATE, EACH OF THE VALVES IN FLUID CONNECTION WITH THE COOLANT APPLYING MEANS FOR CONTROLLING THE AMOUNT OF COOLANT TO THE PARTICLES; AND A PLURALITY OF INDIVIDUALLY RESPONSIVE CONTROL CIRCUITS, EACH BEING CONNECTED BETWEEN ONE OF THE SENSING ELEMENTS AND ONE OF THE ADMITTING VALVES FOR SELECTIVELY CAUSING THE OPERATION OF THE ADMITTING VALVES FROM ONE STATE TO THE OTHER IN RESPONSE TO SIGNALS FROM THE SENSING ELEMENTS, EACH ADMITTING VALVE BEING OPERATED IN RESPONSE TO A SIGNAL CAUSED BY A TEMPERATURE SENSED BY ITS ASSOCIATED ELEMENT, SAID TEMPERATURE ASSOCIATED WITH AT LEAST ONE ADMITTING VALVE BEING DIFFERENT FROM THE TEMPERATURE ASSOCIATED WITH ANY OTHER ADMITTING VALVE.