Food tray with lid locking mechanism

Details Food tray with lid locking mechanism Food tray with lid locking mechanism

1987-04-06

1988-09-20

Marcus, Stephen

Envelopes, wrappers, and paperboard boxes

Paperboard box

Box material includes a coating or a nonpaperboard...

24702, 206470, 220 4B, 220306, B65D 134

Patent

active

047719346

ABSTRACT:
The present invention provides a one-piece plastic thermo-formed foodtray with a lower tray portion which may be closed by a folding upper lid portion. The lid portion is locked over the tray portion by the interlocking of interior upright cylindrical elements formed from a flange about the periphery of the tray portion into exterior upright cylindrical elements formed from a flange about the periphery of the tray portion. Raised lands are provided adjacent to the exterior upright cylindrical elements in order to protect the same from pressure and subsequent degradation and deformation during the interlocking process by limiting the depth of depression with the thumb of the interlocking cylindrical elements.

REFERENCES:
patent: 3351270 (1967-11-01), Hohnjec
patent: 3786982 (1974-01-01), Rakes et al.
patent: 4132344 (1979-01-01), Jewell
patent: 4183446 (1980-01-01), Davis
patent: 4193496 (1980-03-01), Barratt
patent: 4319684 (1982-03-01), Backman et al.
patent: 4512474 (1985-04-01), Harding
patent: 4576330 (1986-03-01), Schepp

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