1978-01-09
1980-04-15
Coan, James F.
93 39R, 93 40, 93 51R, B31B 1526
Patent
active
041977890
ABSTRACT:
A tray in tray container of corrugated board material is formed from a pair of pre-formed flat body blanks in a bi-level machine having vertically aligned upper and lower dies in which a mandrel reciprocates vertically. The inner body blanks and outer body blanks are stacked in feed hoppers adjacent the upper and lower dies, respectively, and individually stripped out of their respective hoppers into horizontally disposed positions over their respective dies, substantially simultaneously. The feed directions of the two hoppers are right angularly related to one another and glue stripes are applied to each of the body blanks during their transit from the hopper into the corresponding die. Descent of the mandrel initially forms the upper inner body blank into an erect tray configuration within the upper die and continued downward movement of the mandrel drives the completely formed and glued inner box into contact with the flat outer body blank, the latter then being formed and glued around the inner body blank during subsequent passage of the mandrel into the lower die.
REFERENCES:
patent: 1343748 (1920-06-01), Reifsnyder et al.
patent: 1721431 (1929-07-01), Claff et al.
patent: 2154950 (1939-04-01), MacDonald
patent: 2977861 (1961-04-01), Gibb
patent: 3145630 (1964-08-01), Moore
Coan James F.
Mueller Frederick E.
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