Closable pouring spout and an axially slidable cap moving a plug thereon for liquid containers

Claim 1

A PLASTIC CAP FOR A LIQUID CONTAINER COMPRISING (A) FASTENING MEANS FOR FASTENING THE CAP TO A POURING NECK PORTION OF A LIQUID CONTAINER; (B) SEALING MEANS FOR SEAING THE CAP IN LIQUID-TIGHT MANNER TO THE NECK OF A CONTAINER ON WHICH THE CAP IS FASTENED; (C) A HOLLOW TUBULAR ELEMENT RISING FROM THE TOP OF THE CAP AND PROVIDING FLUID COMMUNICATION FROM THE INSIDE OF THE CAP TO THE OUTSIDE; (D) SAID TUBULAR ELEMENT HAVING AN INTERNALLY THICKENED PORTION PROVIDING A SMALLER INTERNAL DIAMETER THAN THE MAIN PORTION OF THE TUBULAR ELEMENT; (E) A CAP-LIKE PLUNGER ELEMENT SURROUNDING AND AXIALLY SLIDABLY MOUNTED ON SAID TUBULAR ELEMENT AND HAVING A PLUG EXTENDING DOWN INTO SAID TUBULAR ELEMENT; (F) SAID PLUG BEING RESILIENTLY COMPRESSIBLE AND SLIGHTLY LARGER IN DIAMETER THAN THE INTERNAL DIAMETER OF SAID THICKENED PORTION, SAID PLUG ALSO HAVING A MAXIMUM DIAMETER LESS THAN THE INTERNAL DIAMETER OF THE MAIN PORTION OF THE TUBULAR ELEMENT; (G) SAID PLUG BLOCKING THE TRANSMISSION OF FLUID IN ONE AXIAL POSITION OF THE PLUNGER BY FILLING THE TUBE AT SAID THICKENED PORTION; (H) SAID PLUG ALLOWING THE PASSAGE OF FLUID BETWEEN IT AND THE WALLS OF THE TUBULAR ELEMENT IN ANOTHER AXIAL POSITION OF THE PLUNGER; AND (I) AT LEAST ONE APERTURE IN THE TOP OF SAID PLUNGER PERMITTING THE PASSAGE OF FLUID FROM THE INTERIOR OF THE TUBULAR ELEMENT WHEN THE PLUNGER IS IN SAID OTHER AXIAL POSITION.