Fluid dispenser

Claim 1

MIXING AND DISPENSING APPARATUS COMPRISING A PLURALITY OF LIQUID DISPENSERS; MEANS FOR POSITIONING A SELECTED ONE OF THE DISPENSERS IN DISPENSING RELATIONSHIP TO A CONTAINER; EACH OF SAID LIQUID DISPENSERS INCLUDING LIQUID STORAGE MEANS; MEANS DEFINING A LIQUID METERING CHAMBER IN FLUID COMMUNICATION WITH SAID STORAGE MEANS; AN OUTLET FOR SAID METERING CHAMBER; A PISTON INLET FOR SAID METERING CHAMBER, A PISTON SLIDABLY EXTENDING THROUGH SAID PISTON INLET, SEALING MEANS IN SAID PISTON INLET IN SEALING ENGAGEMENT WITH THE PISTON TO SEAL THE PISTON INLET DURING PISTON MOVEMENT, SAID PISTON BEING SPACED FROM THE SURFACE OF THE METERING CHAMBER; A GEAR RACK OPERATIVELY CONNECTED TO THE PISTON; MANUALLY ROTATABLE GEAR MEANS IN ENGAGEMENT WITH THE GEAR RACK TO RECIPROCATE THE PISTON; INDEX MEANS INCLUDING AN INDICATOR ELEMENT CONNECTED TO THE GEAR MEANS FOR ROTATION THEREWITH TO INDICATE THE AMOUNT OF LIQUID TO BE DISPENSED FROM THE METERING CHAMBER TO PERMIT THE DISPENSING OF A SELECTED AMOUNT OF LIQUID; THE PISTON BEING OPERABLE ON ONE STROKE TO DRAW A SELECTED AMOUNT OF LIQUID INTO THE LIQUID METERING CHAMBER FROM THE LIQUID STORAGE MEANS AND OPERABLE ON THE REVERSE STROKE TO DISPENSE THE SELECTED AMOUNT OF LIQUID FROM THE METERING CHAMBER THROUGH THE METERING CHAMBER OUTLET; AND VALVE MEANS TO CLOSE THE METERING CHAMBER OUTLET DURING FILLING OF THE METERING CHAMBER AND OPERABLE TO BLOCK COMMUNICATION BETWEEN THE METERING CHAMBER AND STORAGE MEANS DURING DISPENSING FROM THE METERING CHAMBER.