Spray head for aerosol valve

Claim 1

APPARATUS FOR DISPENSING PRESSURIZED PRODUCTS FROM A CONTAINER AND COMPRISING AN AEROSOL VALVE CONSTRUCTION IN WHICH THERE IS A COVER MEMBER ADAPTED TO BE SEALED TO SAID CONTAINER, SAID COVER MEMBER HAVING A CENTRAL UPSTANDING BOSS PROVIDED WITH A CENTRAL OPENING, AN ANNULAR GASKET ALSO HAVING A CENTRAL OPENING DISPOSED ON THE INTERIOR OF THE BOSS, A VALVE HOUSING MOUNTED TO THE BOTTOM OF THE BOSS AND CLAMPING THE GASKET TO THE UPPER WALL OF THE BOSS WITH THE OPENINGS ALIGNED, A SPRING PRESSED VALVE PLUNGER DISPOSED IN THE HOUSING AND HAVING AN UPPER END FORMING A VALVE SEAT WITH THE PLUNGER AND BEING PRESSED AGAINST THE BOTTOM OF THE GASKET AND SURROUNDING THE OPENING IN THE GASKET TO PREVENT PRESSURIZED MATERIAL FROM PASSING FROM THE HOUSING AND OUT THROUGH THE COVER MEMBER BY WAY OF THE OPENING, A SOCKET IN THE PLUNGER HAVING ITS BOTTOM END CLOSED TO FORM A FLOOR AND HAVING ITS UPPER END ALIGNED WITH THE OPENINGS, A SPRAY HEAD HAVING AN EXTERIOR DISPENSING ORIFICE AND A HOLLOW DEPENDING STEM CONNECTED THEREWITH, THE STEM HAVING A DIAMETER TO SLIDINGLY AND SEALINGLY, YET REMOVABLY EXTEND THROUGH THE OPENINGS AND BE MATINGLY ENGAGED WITH THE FLOOR OF SAID SOCKET AND BE SECURELY BOTTOMED THEREIN, SAID STEM HAVING A SIDE SLOT WHICH EXTENDS AXIALLY FROM THE BOTTOM OF THE STEM AND IS OPEN CLEAN THROUGH THE SIDE WALL OF SAID STEM FOR THE MAJOR PART OF ITS LENGTH, AND THE SLOT EXTENDING OUT OF THE SOCKET SO AS TO PRESENT AN EXPOSED ENTRANCEWAY TO THE INTERIOR OF SAID STEM WHEN THE SPRAY HEAD IS PUSHED DOWNWARDLY TO UNSEAT THE VALVE SEAT; THE INVENTION HEREIN WHICH COMPRISES: SAID CLEAN THROUGH SLOT HAVING AN UPPER NARROW PORTION WHICH PROVIDES INTERNAL METERING AND A WIDER LOWER PORTION EXTENDING AXIALLY UPWARD FOR A SUBSTANTIALLY GREATER EXTENT THAN THE AXIAL LENGTH OF SAID UPPER PORTION, SAID UPPER PORTION IN TURN HAVING AN AXIAL LENGTH GREATER THAN THE AXIAL LENGTH OF SAID EXPOSED ENTRANCEWAY AND SAID LOWER PORTION OF SAID SLOT, COMMENCING AT THE BOTTOM END OF THE SAID UPPER PORTION BEING OF A WIDTH SUBSTANTIALLY GREATER THAN THE WIDTH OF SAID UPPER PORTION NO PART OF SAID LOWER PORTION BEING EXPOSED DURING USE OF THE APPARATUS, AND SAID WIDTH DIMENSION BEING MEASURED HORIZONTALLY AT THE EXTERIOR OF ENTRANCE OF SAID AXIAL SLOT.