Method of erecting a carton blank, a tool for carrying out the m

Details Method of erecting a carton blank, a tool for carrying out the m Method of erecting a carton blank, a tool for carrying out the m

1991-09-03

1992-06-16

Elkins, Gary E.

Envelopes, wrappers, and paperboard boxes

Paperboard box

A sidewall includes a folded lateral extension of an...

229197, B65D 530

Patent

active

051218780

ABSTRACT:
The invention relates to a method of erecting a carton blank, a tool (15) for carrying out the method and a carton blank (1) used in the method. As the blank (1) is pressed down by means of a plunger (17) into a forming space (18), its end walls (5) are erected by solely their corner areas (9) being pressed towards opposing guide surfaces (19) arranged in the space (18), and are retained between these surfaces and bolsters (23, 24) projecting from the plunger simultaneously as, when the end walls (5) assume a substantially right angle relative the bottom (2), said walls also curve outwards due to the resiliency of the carton blank to form a convex shape for expanding and disposing at an oblique angle insertion openings (10) stamped out of the blank such as to enable easy and rapid insertion and locking of insertion flaps (8) on corresponding adjacent side walls (4) with the aid of locking tongues (11) in the insertion openings (10 ) for final positional fixation of the carton blank forming the carton tray in its ready-erected state. The tool is arranged to erect the blank with the aid of first, opposing guide surfaces (19) and second opposing guide surfaces (20) and a plunger (17) which can be pressed downwards into the space (18) such that the plunger presses the blank down while simultaneously locking the side and end walls (4, 5) of the blank to each other.

REFERENCES:
patent: 377640 (1888-02-01), Schmidt
patent: 610950 (1898-09-01), Smith
patent: 690496 (1902-01-01), Webb
patent: 3285494 (1966-11-01), Baker
patent: 3400877 (1968-09-01), Pierce, Jr.
patent: 3481525 (1969-12-01), Pierce, Jr.
patent: 3556384 (1971-01-01), Pierce, Jr.

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