Dual spray head having vent control means

Claim 1

A SPRAYER ADAPTED TO EJECT EITHER A STREAM OF A MIXTURE OF A CARRIER FLUID WITH A LIQUID CONCENTRATE OR A STREAM OF THE CARRIER FLUID ALONE COMPRISING: A HOLLOW SPRAYER BODY HAVING A CAVITY THERN; MEANS ASSOCIATED WITH SAID BODY FOR COMMUNICATING A SOURCE OF PRESSURIZED CARRIER FLUID WITH SAID CAVITY; AN OPEN-ENDED MIXTURE EJECTING CONDUIT SECURED TO SAID BODY AND COMMUNICATING THROUGH THE WALL THEREOF WITH SAID CAVITY; AN OPEN-ENDED CARRIER FLUID EJECTING CONDUIT SECURED TO SAID BODY AND COMMUNICATING THROUGH THE WALL THEREOF WITH SAID CAVITY AT A LOCATION SPACED FROM THE POINT OF COMMUNICATION OF THE OTHER CONDUIT; A VALVE MEMBER WIHTIN SAID CAVITY MANUALLY DISPLACEABLE BETWEEEN ONE POSITION IN WHICH IT DIRECTS CARRIER FLUID FROM SAID CAVITY INTO SAID MIXTURE CONDUIT AND A SECOND POSITION IN WHICH IT DIRECTS CARRIER FLUID FROM SAID CAVITY INTO SAID CARRIER FLUID CONDUIT; FLOW-RESTRICTION MEANS ASSOCIATED WITH SAID MIXTURE CONDUIT FORMING A SUCTION ZONE IN SAID MIXTURE CONDUIT; A FLOW-RESTRICTING ORIFICE INSERT UPSTREAM OF SAID FLOW-RESTRICTING MEANS WHICH CREATES SAID SUCTION ZONE, SAID INSERT HAVINGA BORE WHOSE DOWNSTREAM END IS OF UNIFORM CROSS SECTION OF ABOUT THE SIZE OF THE BORE DEFINED BY SIAD FLOW-RESTRICTING MEANS AND WHOSE UPSTREAM END IS OF OUTWRDLY EXPANDING FRUSTOCONICAL SHAPE; ADJUSTABLE VENT MEANS COMMUNICATING THROUGH THE WALL OF SAID MIXTURE CONDUIT WITH SAID SUCTION ZONEAND WITH THE ATMOSPHERE; SAID MEANS INCLUDING A PASSAGEWAY THROUGH THE WALL OF SAID MIXTURE CONDUIT, A DISK MEMBER HAVING AS PLURALITY OF DIFFERENT-SIZED ORIFICES THERETHROUGH AND MEANS MOUNTING SAID DISK MEMBER FOR ROTATION ABOUT ITS AXIS FOR BRINGING SAID DIFFERENT-SIZEDC ORIFICES SEQUENTIALLY INTO ALIGNMENT WITH SAID VENT PASSAGEWAY; AND MEANS FOR COMMUNICATING SAID SUCTION ZONE WITH A SOURCE OF LIQUID CONCENTRATE.