Self-locking container closure

Details Self-locking container closure Self-locking container closure

1987-02-05

1989-07-25

Little, Willis

Envelopes, wrappers, and paperboard boxes

Paperboard box

With closure for an access opening

229108, 229155, 229 41C, B65D 536

Patent

active

048505285

ABSTRACT:
A container with integral self-closing and self-locking foldable closure material above the container rim which is pleated with alternating internal and external folds. The geometry of the folds creates a spring action to the pleated folds as the top is folded which will `lock` resiliently in place when they are pushed beyond the rim of the container and will remain so, whether or not the panels are designed to meet in the center to completely close the container or are designed to leave a center opening when locked. While the container is closed a rod or tube may be inserted in any of the disclosed forms without opening or unlocking the closure.

REFERENCES:
patent: 2047804 (1936-07-01), Shapiro
patent: 2091291 (1937-08-01), Ringler
patent: 3232480 (1966-02-01), Stanley
patent: 3253767 (1966-05-01), Pellaton
patent: 3549081 (1970-12-01), Nelson
patent: 3768720 (1973-10-01), Bundy

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