Dispensing apparatus

Claim 1

DISPENSING APPARATUS ADAPTED FOR OPERATION AT RELATIVELY HIGH TEMPERATURES COMPRISING: SUPPORT MEANS; A PAIR OF VERTICAL, PARALLEL DISPENSING UNITS MOUNTED ON SAID SUPPORT MEANS NEXT TO EACH OTHER; EACH OF SAID DISPENSING UNITS COMPRISING A SUPPLY TANK, A COVER ON SAID TANK, A METERING CYLINDER CONNECTED TO SAID TANK, A RECIPROCAL PISTON DISPOSED IN SAID CYLINDER AND DEFINING AN EXPANSIBLE CHAMBER, SAID RECIPROCAL PISTON BEING HEAT RESISTANT AND PLASTIC SO AS TO READILY CONFORM TO THE WALL SURFACES OF SAID CYLINDER, SAID RECIPROCAL PISTON INCLUDING ANNULAR LIP PORTIONS PROTUDING FROM OPPOSITE ENDS THEREOF, SPRING MEANS RECEIVED WITHIN SAID ANNULAR LIP PORTIONS FOR URGING THE SAME IN CONTACT WITH THE WALL SURFACES OF SAID CYLINDER, SAID PISTON HAVING A PASSAGE THROUGH WHICH FLUID IS ADMITTED TO SAID CHAMBER ON THE UPSTROKE OF SAID PISTON, A PISTON ROD EXTENDING THROUGH SAID COVER AND CONNECTED TO SAID PISTON, A VALVE MEMBER MOVABLE BETWEEN OPEN AND CLOSED POSITION FOR CONTROLLING THE FLOW OF FLUID THROUGH SAID FLOW PASSAGE, A VALVE ACTUATING ROD CONNECTED TO SAID VALVE MEMBER AND EXTENDING THROUGH SAID COVER COAXIAL TO SAID PISTON ROD, AND A SELECTIVELY-OPERABLE ACTUATING MECHANISM CONNECTED TO SAID RODS FOR MOVING ONE RELATIVE TO THE OTHER UPON OPERATION OF SAID MECHANISM; AND MEANS MOUNTED ON SAID SUPPORT MEANS FOR DRIVING SAID PISTON RODS, SAID MEANS COMPRISING TWO ADJACENT LEVERS MOUNTED ON SAID SUPPORT MEANS FOR PIVOTAL MOVEMENT ABOUT THE SAME AXIS, ONE OF SAID TWO LEVERS INCLUDING AN ELONGATED ARCUATE SLOT, TWO LINKS CONNECTED BETWEEN SAID LEVERS AND SAID PISTON RODS FOR DRIVING SAID PISTON RODS IN RESPONSE TO PIVOTING OF SAID LEVERS, AND MEANS ADJUSTABLY CONNECTING AT LEAST ONE OF SAID TWO LINKS TO THE ASSOCIATED ONE OF SAID LEVERS AND ALONG SAID ELONGATED ARCUATE SLOT TO PERMIT ADJUSTMENT OF THE LENGTH OF STROKE OF THE ASSOCIATED PISTON.