초록 ▼

A cap for substantially gas-tight sealing engagement with a container wall having an opening therein circumscribed by a sealing surface has an end wall and a depending skirt with a portion for securing the cap to a container wall, and a tab for manual engagement to rotate the cap between a container

A cap for substantially gas-tight sealing engagement with a container wall having an opening therein circumscribed by a sealing surface has an end wall and a depending skirt with a portion for securing the cap to a container wall, and a tab for manual engagement to rotate the cap between a container wall sealing surface engaging position and a storage position. The cap has a vent region provided by a weakened zone that is preferably located on or near the tab. The weakened area may include removal of a portion of the cap skirt, thinning a portion of the cap skirt, variations in wall thickness of portions of the cap skirt or top wall in a predetermined manner, configurating the portion of the tab which connects with the cap in such a manner as to facilitate ready circumferential expansion of the cap. Combinations of these weakening features may be employed. The cap is adapted once in gas-tight sealing engagement with the sealing surface of the container wall to vent in the weakened zone upon predetermined internal container, pressure being attained and, subsequently, automatically resealed. A container in combination with such a cap is also disclosed.

대표청구항 ▼

A cap for substantially gas-tight sealing engagement with a container wall having an opening therein circumscribed by a sealing surface, said cap comprising, a top wall and a depending skirt cooperating therewith to define a sealing portion which is sealingly engageable in gas-tight relationship wit

A cap for substantially gas-tight sealing engagement with a container wall having an opening therein circumscribed by a sealing surface, said cap comprising, a top wall and a depending skirt cooperating therewith to define a sealing portion which is sealingly engageable in gas-tight relationship with said sealing surface, means for securing said cap to said container wall, tab means for manually engaging said cap to rotate the same between a sealed position and an unsealed position, said cap having vent means provided by at least one weakened zone, which is disposed on or adjacent to said tab means, whereby said vent means will, when container pressure exceeds a predetermined level, move a portion of said cap away from said sealing surface to vent said container and, subsequently, automatically reestablish sealed contact with said sealing surface, and said cap having only one said weakened zone.