Bottle screw cap opener includes cap-shaped recess to fit over cap ribs for positive entrainment plus top hole to vent air on placement.

摘要

The opener is recessed to suit the cap in such a way as to grip the cap ribs exactly and so increase grip. The recess is further conically expanded (2) to ensure the opener fits positively onto the screw cap and the recess is holed (4) to vent the air as the opener seats onto the cap.