Method and apparatus for making expansible gusset envelopes

Details Method and apparatus for making expansible gusset envelopes Method and apparatus for making expansible gusset envelopes

1976-02-09

1977-04-12

Coan, James F.

93 13, B31B 2926

Patent

active

040168085

ABSTRACT:
Method and apparatus for fabricating expansible envelopes from a single blank by (1) inwardly folding side gusset sections between longitudinally extending triple score lines, (2) inwardly folding bottom gusset sections between transverse score lines hinging envelope front and back panels together, and (3) folding down one of the panels into glued disposition with side flaps hinged to the side gussets so that they overlie the other panel with all gussets inwardly collapsed at completion of operations. Means are also included for crimping tabs which are hinged to the ends of one of the gusset sections so that they define saddles, said saddles being tucked into the margins of the other of the gusset sections and adhered thereto as a closed corner gusset.

REFERENCES:
patent: 1580441 (1926-04-01), Parks
patent: 2899874 (1959-08-01), Normandin
patent: 3908524 (1975-09-01), Shore

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