Lock set tray

Details Lock set tray Lock set tray

1990-04-09

1991-06-04

Elkins, Gary E.

Envelopes, wrappers, and paperboard boxes

Paperboard box

Including a polygonal, nonrectangular wall

229195, 229197, B65D 530

Patent

active

050207172

ABSTRACT:
A paperboard tray and unitary blank for forming it. Two of the tray blanks may be joined in tandem to form, after erection, a clamshell type carton. The tray is provided with cooperating latching tongues and latching slits to maintain it erected. The specific form of the latching tongues and slits enables the tray sides to tilt outwardly after initial tongue and slit engagement and thus permit stacking. The use of the tongue and slit of this invention also permits tray formation without the need of adhesives, thus permitting safe use of the tray or clamshell carton in serving food, as at the retail level.

REFERENCES:
patent: 199675 (1878-01-01), Wolf
patent: 518899 (1894-04-01), Schmidt
patent: 871767 (1907-11-01), Raynaud
patent: 1195539 (1916-08-01), Waltz
patent: 1515983 (1924-11-01), Williams
patent: 1680661 (1928-08-01), Birrell
patent: 2488703 (1949-11-01), Buttery
patent: 3059829 (1962-10-01), Thompson
patent: 3481525 (1969-12-01), Pierce, Jr.

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