Fluid dispensing device having light sensitive means

Claim 1

A LIQUID DISPENSER FOR DELIVERING PREDETERMINED, EQUAL, MEASURED QUANTITIES OF LIQUID, COMPRISING, IN COMBINATION, A BURET PROVIDED WITH MANUALLY OPERATED CLOSING MEANS TO PREVENT THE FLOW OF LIQUID FROM SAID BURET DURING AT LEAST THE FEEDING AND MEASURING PERIOD; A FEED LINE FOR FEEDING TO THE BURET THE LIQUID TO BE MEASURED, A VALVE FOR CONTROLLING THE FLOW OF LIQUID THROUGH THE FEEDING LINE; ELECTROMAGNETIC MEANS FOR OPENING AND CLOSING SAID VALVE; A NORMALLY OPEN ELECTRIC CIRCUIT, INCLUDING AN ELECTRICAL SOURCE, PROVIDED WITH A SWITCH FOR ENERGIZING SAID ELECTROMAGNETIC MEANS AND PARALLEL WITH SAID SWITCH A RELAY FOR CONTROLLING THE ELECTRIC CIRCUIT; LIGHT SENSITIVE MEANS CONNECTED IN SAID CIRCUIT AND MOVABLY LOCATED ON ONE SIDE OF A CALIBRATED PORTION OF SAID BURET AND A SOURCE OF LIGHT MOVABLY MOUNTED IN SUCH POSITION THAT A BEAM OF LIGHT IS DIRECTED THROUGH SAID BURET ONTO SAID LIGHT SENSITIVE MEANS; A FLOAT BUOYED BY THE LIQUID IN SAID CONTAINER FOR INTERRUPTING THE LIGHT BEAM TO SUCCESSIVELY OPEN SAID RELAY, DEENERGIZE SAID ELECTROMAGNETIC MEANS AND CLOSE THE VALVE IN SAID FEEDING MEANS AS THE LIQUID IN THE BURET ASCENDS TO A PREDETERMINED LEVEL.