Apparatus for delivering measured quantities of substances

Claim 1

AN APPARATUS FOR DELIVERING QUANTITIES OF A LIQUID OR A SEMI-LIQUID SUBSTANCE, COMPRISING A CYLINDER, A PISTON HAVING A DISCHARGE STROKE AND A RETURN STROKE WITHIN THE CYLINDER AND DIVIDING THE INTERIOR THEREOF INTO AN OPERATING CHAMBER AND A DISPLACEMENT CHAMBER, SAID CYLINDER HAVING SUPPLY AND DELIVERY PASSAGES FOR THE ADMISSION AND DELIVERY OF SAID SUBSTANCE TO AND FROM THE DISPLACEMENT CHAMBER AND INLET AND OUTLET PASSAGES FOR THE ADMISSION AND DELIVERY OF A PRESSURE OPERATING FLUID TO AND FROM THE OPERATING CHAMBER, SAID PISTON HAVING A TAPERED HEAD END, THE MOUTH OF THE DELIVERY PASSAGE LEADING TO THE DISPLACEMENT CHAMBER BEING LOCATED OPPOSITE THE TAPERED HEAD END AND BEING ADAPTED TO RECEIVE SAID END, A SLIDE VALVE RECIPROCALLY MOUNTED IN SAID CYLINDER FOR CONTROLLING THE SUPPLY AND DELIVERY PASSAGES FOR THE SUBSTANCE, SAID VALVE CLOSING THE SUPPLY PASSAGE FOR THE SUBSTANCE BEFOR IT BEGINS TO OPEN THE DELIVERY PASSAGE FOR THE SUBSTANCE, A VALVE MOUNTED IN SAID CYLINDER FOR CONTROLLING THE ADMISSION AND DELIVERY OF THE PRESSURE OPERATING FLUID, AND A SINGLE LEVER PIVOTALLY MOUNTED UPON SAID CYLINDER AND OPERATIVELY CONNECTED WITH BOTH VALVES, THE TWO VALVES OPERATING TO ALLOW THE SUBSTANCE TO ENTER THE DISPLACEMENT CHAMBER WHILE CAUSING THE PISTON TO CARRY OUT ITS RETURN STROKE AND TO ALLOW THE PRESSURE OPERATING FLUID TO CAUSE THE PITON TO CARRY OUT ITS DISCHARGE STROKE TO DISCHARGE THE SUBSTANCE FROM THE DISPLACEMENT CHAMBER, THE TAPERED HEAD END OF THE PISTON CLOSING THE MOUTH OF THE DELIVERY PASSAGE FOR THE SUBSTANCE AT THE END OF THE DISCHARD STROKE.

Claim 2

AN APPARATUS FOR DELIVERING QUANTITIES OF A LIQUID OR A SEMI-LIQUID SUBSTANCE, COMPRISING A CYLINDER, A PISTON HAVING A DISCHARGE STROKE AND A RETURN STROKE WITHIN THE CYLINDER AND DIVIDING THE INTERIOR THEREOF INTO AN OPERATING CHAMBER AND A DISPLACEMENT CHAMBER, SAID CYLINDER HAVING SUPPLY AND DELIVERY PASSAGES FOR THE ADMISSION AND DELIVERY OF SAID SUBSTANCE TO AND FROM THE DISPLACEMENT CHAMBER AND INLET AND OUTLET PASSAGES FOR THE ADMISSION AND DELIVERY OF A PRESSURE OPERATING FLUID TO AND FROM THE OPERATING CHAMBER, SAID PISTON HAVING A TAPERED HEAD END, THE MOUTH OF THE DELIVERY PASSAGE LEADING TO THE DISPLACEMENT CHAMBER BEING LOCATED OPPOSITE THE TAPERED HEAD END AND BEING ADAPTED TO RECEIVE SAID END, A SLIDE VALVE RECIPROCALLY MOUNTED IN SAID CYLINDER FOR CONTROLLING THE SUPPLY AND DELIVERY PASSAGES FOR THE SUBSTANCE, SAID VALVE CLOSING THE SUPPLY PASSAGE FOR THE SUBSTANCE BEFOR IT BEGINS TO OPEN THE DELIVERY PASSAGE FOR THE SUBSTANCE, A VALVE MOUNTED IN SAID CYLINDER FOR CONTROLLING THE ADMISSION AND DELIVERY OF THE PRESSURE OPERATING FLUID, AND A SINGLE LEVER PIVOTALLY MOUNTED UPON SAID CYLINDER AND OPERATIVELY CONNECTED WITH BOTH VALVES, THE TWO VALVES OPERATING TO ALLOW THE SUBSTANCE TO ENTER THE DISPLACEMENT CHAMBER WHILE CAUSING THE PISTON TO CARRY OUT ITS RETURN STROKE AND TO ALLOW THE PRESSURE OPERATING FLUID TO CAUSE THE PITON TO CARRY OUT ITS DISCHARGE STROKE TO DISCHARGE THE SUBSTANCE FROM THE DISPLACEMENT CHAMBER, THE TAPERED HEAD END OF THE PISTON CLOSING THE MOUTH OF THE DELIVERY PASSAGE FOR THE SUBSTANCE AT THE END OF THE DISCHARD STROKE.