Food tray with lid locking mechanism
US4771934A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1987 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Apr 6, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T24/45995
- WIPO fieldHandling
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.