Screw cap for sealed bottles - has internal spiral blade, with inwards curved inner end, breaking and lifting seal

摘要

The cap screws initially onto the neck (4) of a bottle (5) until internal projections (2) snap into a neck groove. A guarantee band (10), once removed permits it to be screwed slightly further to break a diaphragm (6) fixed to the bottle neck. - Tight screwing causes an internal spiral blade projection (12) to cut through the diaphragm seal. The inside end (12') of the blade projection partially lifts the seal by being curved inwards thus allowing the seal to be grasped and removed completely.