Envelopes – wrappers – and paperboard boxes – Paperboard box – End structure
Patent
1986-02-05
1987-11-24
Marcus, Stephen
Envelopes, wrappers, and paperboard boxes
Paperboard box
End structure
220 73, 229 56, 229 57, B65D 330
Patent
active
047082836
ABSTRACT:
In a metal reinforcing ring applied to the top edge of a paperboard container, an improved construction which avoids presenting any sharp edges by curling the lower edge of the reinforcing ring under a shoulder on the inside of the container such that the lower edge of the ring is butted against the inside container surface at an unexposed location. Special crimping rolls apply the reinforcing ring to the top edge of the container.
REFERENCES:
patent: 1256933 (1918-02-01), Schriner
patent: 1700164 (1929-01-01), Hulbert
patent: 1702606 (1929-02-01), Hulbert
patent: 2170436 (1939-08-01), Vogel
patent: 2185171 (1940-01-01), Brown
patent: 3596827 (1971-08-01), Kinney
Elkins Gary E.
Marcus Stephen
Sealright Co. Inc.
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