Bottle closure

Claim 1

A DISPENDING CLOSURE FOR A MOUTH OF A CONTAINER ADAPTED TO CONTAIN FLOWABLE MATERIAL COMPRING, (A) A CLOSURE BODY OF RESILIENT MATERIAL FOR CONNECTION TO SAID CONTAINER AT THE MOUTH THEREOF, (B) SAID CLOSURE BODY HAVING AN END PORTION WITH AN OPENING ARRANGED SUBSTANTIALLY CENTRALLY THEREOF AND COMMUNICATION WITH THE INTERIOR OF THE MOUNT OF SAID CONTAINER WITH MARGINAL PORTIONS AROUND SAID OPENING CONVERGING INWARDLY TO AN EDGE DEFINING SAID OPENING, (C) A DISPENSING VALVE ELEMENT MOUNTED FOR SWINGING MOVEMENT AT SAID END PORTION, SAID VALVE ELEMENT EMBODYING A DISC-LIKE MEMBER HAVING OPPOSED FACES WITH A PERIUPHERAL PORTION THEREBETWEEN FOR SEALING ENGAGEMENT WITH SAID EDGE DEFINING SAID OPENING, SAID VALVE ELEMENT HAVING OUTWARDLY EXTENDING PERIPHERAL LIPS FOR RESISTING SWINGING MOVEMENT OF SAID VALVE ELEMENT, (D) A FLEXIBLE HINGE MEMBER OF RELATIVELY SMALL CROSSSECTION CONNECTING THE VALVE ELEMENT PERIPHERY WITH SAID END PORTION EDGE AT A POINT THEREOF, (E) MEANS ON SAID VALVE ELEMENT ADJACENT A SIDE THEREOF SPACED FROM THE HINGE MEMBER FOR LIFTING SAID SIDE OF THE VALVE ELEMENT TO SWING SAME ON SAID HINGE MEMBER TO OPEN POSITON; (F) AND MEANS DEPENDING FROM SAID VALVE ELEMENT FOR ENGAGING SAID EDGE IN RESPONSE TO SWINGING OF SAID VALVE ELEMENT TO OPEN POSITION TO LIMIT SAID OPENING SWINGING MOVEMENT.