Vented plastic can and tin lid therefor
AssigneeUnited States Tobacco Company
InventorsEdward Jurczenia, Alton W. Adams
Life of this patent
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Abstract
A plastic can has been disclosed which is designed to retain freshness of the contents and provide, during the lidding operation, an easy placement of the lid thereon; the can has vents which allow the lid to be placed thereon without pneumatic back pressure restraining the lid from properly seating on the can; at the same time, for high speed lid placement certain camming arrangements have been provided to facilitate the lid being placed on the can and being seated properly thereon; considerable improvements in retained content freshness have been observed.
Claims8
As an article of manufacture, a plastic can suitable for receiving a lid for closing said can comprising:
- a side wall, a lid receiving section and a bottom wall wherein said lid receiving section has a side wall of a reduced thickness from that of the side wall;
- a ledge at the bottom of said lid receiving section;
- an interference fit section between said ledge and a top of said lid receiving section;
- a lid camming section between said interference fit section and said top of said lid receiving section;
- a plurality of venting slots in said interference fit section and at the bottom of said lid camming section;
- a plurality of slots in said lid camming section within the top surface thereof;
- an outer rim for said top surface;
- and a pointed inner rim defined between an inner surface of said lid camming section and said top surface for said lid camming section.
In a method for lidding a can such as a plastic can with a metal lid, the improvement comprising:
- camming said lid on said can at an initiation catch point on one side of said can independent of an orientation of said can, wherein the lid is oriented at an angle away from the horizontal surface of said can;
- progressively seating, by force, said lid on said can;
- progressively relieving pneumatic back-pressure in said can while said lid is being seated;
- and
- predeterminedly venting said can for desired venting purposes.
Dependencies are inferred from the claim text.