US 3,995,539 AGranted

Apparatus for erecting cartons

AssigneeSprinter Pack AB

InventorsKay Arne Wallin, Bengt Anders Ewjen, Jan Ingemar Nilsson

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Abstract

Method and apparatus for erecting carton blanks having preformed fold lines in which flat carton blanks are pressed into a pair of hollow forming shafts by a plunger assembly of complementary configuration to form hingedly connected lid and tray portions. The plunger assembly comprises a pair of movable plunger members which undergo synchronized translational and rotational movement and in cooperation with a swingable plate to erect hingedly connected sidewalls of the tray and lid portions. When the side panels of the lid and tray portions of the carton are erected, they are held by the plunger assembly against stationary bottom portions of the shafts. Finger assemblies undergo rotational and reciprocating motion to fold glue bearing edge flaps of the lid and tray portion into their assembled position to maintain associated side panels in their erected position to enable the glued portions to "set". A novel carton blank which is provided with "biasing tabs" is also described.

Claims10

Dependent claims

Apparatus for erecting a carton from a carton blank having a tray portion comprised of a tray bottom and four hingedly connected side panels surrounding said tray bottom and a lid portion having a lid bottom and four hingedly connected side panels surrounding said lid bottom and a common panel section hingedly connected to one tray portion side panel and one lid portion side panel said apparatus comprising:

receiving means for receiving the blank;
means for supporting the hinged connection between the common panel section and the said one tray portion side panel and being movable within said receiving means;
reciprocating means positioned above said receiving means and movable in first and second opposing directions respectively towards and away from said supporting means;
a plunger assembly comprised of plunger halves each having blank engaging surfaces positioned on opposite sides of said supporting means;
means for swingably mounting said plunger halves to said reciprocating means so that the blank engaging surfaces are always maintained substantially parallel to one another;
means movable in a first direction for swinging said carton blank engaging surfaces downwardly and towards said supporting means while maintaining their parallel relationship whereby said surfaces initially respectively engage the tray and lid bottoms and the adjacent ends of said surfaces and engage the common panel section and the tray portion side panel hingedly connected thereto and move said common panel section and said hingedly connected tray side panel towards one another.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/534,366Filed 19 Dec 1974 · continuation in part
Priority: 11 May 1973
Granted: 7 Dec 1976
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

B31B 50/444
By plungers moving through folding dies: having several plungers moving in a closed path and cooperating with stationary folding dies
B31B 50/00
Making rigid or semi-rigid containers
B31B 50/44
Folding sheets, blanks or webs: by plungers moving through folding dies
B31B
Making containers of paper, cardboard or material worked in a manner analogous