Bottle closures and the like

Claim 1

A TAMPER-PROOF BOTTLE CLOSURE FOR A BOTTLE HAVING A NECK, SAID CLOSURE BEING MOULDED IN ONE PIECE FROM A RESILIENT PLASTIC MATERIAL, COMPRISING A HEAD PORTION ASSOCIATED WITH MEANS FOR SEALING THE CLOSURE ON TO A BOTTLE NECK, AND AN ELONGATED THIN-WALLED CAPSULE SKIRT DEPENDING DOWNWARDLY FROM THE HEAD PORTION, SAID SKIRT BEING ADAPTED TO FIT OVER THE EXTERIOR OF THE BOTTLE NECK WHEN THE CLOSURE IS FITTED THEREON AND TO FIRMLY GRIP THE EXTERIOR OF THE BOTTLE NECK TO RESIST REMOVAL OF THE CLOSURE WHILE THE CAPSULE SKIRT REMAINS INTACT AND CONNECTED TO THE HEAD PORTION, SAID CAPSULE SKIRT BEING FORMED WITH SLITS THERETHROUGH TO DEFINE A CUT-OUT TAB PORTION SURROUNDED BY SAID SKIRT AND NORMALLY LYING SUBSTANTIALLY FLUSH WITH THE EXTERNAL SURFACE OF THE SKIRT, SAID TAB PORTION BEING ADAPTED TO BE GRIPPED BY THE FINGERS AND PULLED IN ORDER TO TEAR THE CAPSULE SKIRT, A FIRST LINE OF WEAKENING IN THE SKIRT EXTENDING OBLIQUELY DOWNWARDS FROM THE END OF A SLIT DEFINING SAID TAB PORTION TO THE BOTTOM EDGE OF THE SKIRT, AND A SECOND LINE OF WEAKENING IN THE SKIRT EXTENDING FROM THE END OF ANOTHER SLIT DEFINING SAID TAB PORTION AND COMPLETELY AROUND THE TOP OF THE SKIRT WHERE IT JOINS THE HEAD PORTION, AND SAID TAB PORTION HAVING A PROJECTION ON ITS INTERNAL SURFACE WHICH, WHEN THE CLOSURE IS FITTED ON TO A BOTTLE NECK, IS ENGAGED BY THE BOTTLE NECK SO THAT THE TAB IS FLEXED OUTWARDLY OF THE EXTERNAL SURFACE OF THE SKIRT TO FACILITATE RAISING THE TAB FOR GRIPPING BY THE FINGERS.