Apparatus for dispensing measured quantities of material

Claim 1

DISPENSING APPARATUS COMPRISING AN AIR MOTOR HAVING A CYLINDER AND A PISTON MOVABLE THEREIN, AN AIR VALVE FOR ALTERNATELY DIRECTING AIR UNDER PRESSURE TO AND VENTING AIR FROM OPPOSITE ENDS OF SAID MOTOR TO MOVE THE PISTON, A MEASURING PUMP CYLINDER COAXIAL WITH THE AIR MOTOR AND HAVING A PISTON MOVABLE THEREIN, MEANS FOR CONNECTING ONE END OF THE PUMP CYLINDER WITH A SOURCE OF PUMPABLE MATERIAL, A NOZZLE FOR RECEIVING MATERIAL PUMPED FROM THE ONE END OF SAID PUMP CYLINDER, A PISTON ROD CONNECTED TO BOTH PISTONS AND PROJECTING FROM SAID PUMP CYLINDER, STOP MEANS ENGAGEABLE BY THE PISTONS, VALVE DETERMINING THE LENGTH OF THE STROKE OF THE PISTONS, VALVE CONTROL MEANS ASSOCIATED WITH THE STOP MEANS THE VALVE FOR REVERSING AIR FLOW FROM THE VALVE TO THE AIR MOTOR, THEREBY REVERSING THE DIRECTION OF MOVEMENT OF THE PISTON THEREIN, AND SAID NOZZLE BEING AIR OPERATED, SAID APPARATUS HAVING A SECOND AIR VALVE FOR PROVIDING AIR UNDER PRESSURE TO SAID NOZZLE.