Spray head having a valve stem and disc-form check valve

Claim 1

A SPRAY HEAD COMPRISING A UNITARY, MAIN BODY HAVING A CYLINDRICAL CUP ELEMENT WITH INTERNAL THREADS ADAPTED FOR CONNECTION WITH A FLUID CONTAINER, AND MEANS CARRIED ON SAID CAP, GENERALLY DIAMETRALLY OF SAID ELEMENT, AND DEFINING A SYSTEM OF THROUGH PASSAGES FOR FLUID UNDER PRESSURE, SAID MEANS HAVING A THREADED, ENTRANCE BORE, ON THE UPSTREAM SIDE, A FIRST REDUCED BORE BEYOND SAID ENTRANCE BORE, DEFINING A FIRST SHOULDER, A SECOND REDUCED BORE BEYOND SAID FIRST REDUCED BORE, DEFINING A SECOND SHOULDER, SAID SECOND, REDUCED BORE HAVING AT LEAST ONE LATERAL PORT COMMUNICATING WITH THE ATMOSPHERE, AN EXIT BORE ON THE DOWNSTREAM SIDE, AND AN INTERMEDIATE PASSAGE ARRANGED TRANSVERSELY TO SAID EXIT BORE AND THE OTHER SAID BORES, SAID PASSAGE COMPRISING AN INNER BORE, AN INTERMEDIATE COUNTERBORE, AND A THREADED, OUTER COUNTERBORE, A VALVE STEM THREADEDLY RECEIVED IN SAID OUTER COUNTERBORE, AND HAVING A TEPERED, INNER END SEATABLE ON THE RIM OF SAID INNER BORE, A PORT COMMUNICATING BETWEEN SAID SECOND, REDUCED BORE AND SAID INTERMEDIATE COUNTEDBORE, A PORT COMMUNICATING BE TWEEN SAID INNER BORE AND SAID EXIT BVORE, AND SUBSTANTIALLY LESS IN DIAMETER THAN SAID EXIT BORE, SAID CAP HAVING AN APERTURE VENTING TO ATMOSPHERE, SAIID CAP AND SAID MEANS HAVING A COMMON PASSAGE, ADAPTED TO HOLD A TUBE FOR IMMERSION IN A SAID FLUID CONTAINER, AND SAID MEANS HAVING A RESTRICTED PASSAGE COMMUNICATING BETWEEN SAID COMMON PASSAGE AND SAID EXIT BORE, AND A CHECK VALVE OF RUBBERY MATERIAL, COMPRISING A DISC-FORM BASE SEATED ON SAID SECOND SHOULDER, AND HAVING AN EXTENDING, PERIPHERAL FLANGE SEATED ON SAID FIRST SHOULDER, SAID DISC HAVING AN ANNULAR CHANNEL ON ITS UPSTREAM SIDE, AND A SKIRT FORMING A CYLINDRICAL CUP ON ITS DOWNSTREAM SIDE, LOOSELY FITTED ING SAID SECOND, REDUCED BORE AND ADAPTED TO CLOSE SAID LATERAL PORT UNDER INTERNAL PRESSURE, AND YIELD TO EXTERNAL PRESSURE TO UNCOVER SAID LATERAL PORT, SAID DISC HAVING A CENTRAL, THROUGH OPENING, OF ELONGATE, ELLIPTICAL FORM, AND SAID DISC HAVING A SECOND SKIRT ON ITS DOWNSTREAM SIDE, FORMING A CONTINUATION OF SAID OPENING, AND HAVING A TERMINAL PORTION WITH SIDE WALLS CONVERGING TO A LINE OF CONTACT, FORMING A SLIT GENERALLY COMPARABLE IN LENGHT WITH THE MAJOR AXIS OF SAID OPENING.