Paperboard frame with lockable corners

Details Paperboard frame with lockable corners Paperboard frame with lockable corners

1984-10-05

1986-02-18

Moy, Joseph Man-Fu

Envelopes, wrappers, and paperboard boxes

Wrapper

Bottle

229 35, 229 41B, B65D 500, B65D 526

Patent

active

045708444

ABSTRACT:
A frame is made from a one-piece paperboard blank which is folded and glued into a collapsed shipment and storage configuration. The collapsed frame can be manually expanded for use. The corners of the expanded frame are locked by overlapping tabs to hold the frame in its expanded state. The frame can be used to hold air filters which are used to filter the air entering a hot air furnace.

REFERENCES:
patent: 2957617 (1960-10-01), Bolding
patent: 2980316 (1961-04-01), Buttery et al.
patent: 3003676 (1961-10-01), De Nola
patent: 3603500 (1971-09-01), Dutcher
patent: 4305544 (1981-12-01), Noonan
patent: 4349147 (1982-09-01), Jensen

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