Machine for the preparation of foundry molds from match-plates

Claim 1

APPARATUS FOR PLACING MOLD SAND IN OPEN-TOPPED FOUNDRY FLASKS HAVING MATCH-PLATES THEREIN AND SUPPORTING MEANS FOR THE MATCH-PLATES AND FLASKS, THE COMBINATION COMPRISING: A SUPPORT FOR SAID SUPPORTING MEANS LOCATED AT A LOADING STATION; SAND DISCHARGING MEANS INCLUDING TWO UPRIGHT IMPELLERS, EACH IMPELLER HAVING AN INLET OPENING FOR RECEIVING SAND AND A GENERALLY DOWNWARDLY DIRECTED DISCHARGE SPOUT; DRIVE MEANS CONNECTED TO ROTATE SAID IMPELLERS; MEANS SUPPORTING SAID SAND DISCHARGING MEANS FOR ROTATION ABOUT AN UPRIGHT AXIS WITH SAID DISCHARGE SPOUTS BEING LOCATED OVER SAID SUPPORT AT SAID LOADING STATION, THE DOWNWARDLY DIRECTED DISCHARGE SPOUTS OF THE IMPELLERS BEING POSITIONED ECCENTRICALLY TO THE UPRIGHT AXIS OF ROTATION OF SAID SAND DISCHARGING MEANS AND BEING ARRANGED AT ANGLES TO THE VERTICAL AND ON OPPOSITE SIDES OF THE UPRIGHT AXIS OF ROTATION OF SAID SAND DISCHARGING MEANS; MEANS ARRANGED TO ROTATE SAID SAND DISCHARGING MEANS ABOUT ITS UPRIGHT AXIS OF ROTATION, SAID LAST-NAMED MEANS COMPRISING MEANS FOR DELIVERING SAND AT DIFFERENT RATES TO SAID INLET OPENINGS TO SAID IMPELLERS WHEREBY THE REACTION FORCES OF SAND DISCHARGED FROM SAID IMPELLERS ARE DIFFERENT AND CREATE A ROTATING FORCE ON SAID SAND DISCHARGING MEANS; SAID MEANS FOR DELIVERING SAND TO SAID IMPELLERS COMPRISING A COMMON SAND RECEIVING CHAMBER WITH OPENINGS TO THE IMPELLERS OPENING THEREFROM AND VALVE MEANS POSITIONED TO SELECTIVELY VARY THE RELATIVE EFFECTIVE SIZE OF SAID OPENINGS TO SAID IMPELLERS.