Envelopes – wrappers – and paperboard boxes – Paperboard box – Cylindrical or conical body – or wall structure
Reexamination Certificate
1999-05-20
2001-04-17
Shoap, Allan N. (Department: 3727)
Envelopes, wrappers, and paperboard boxes
Paperboard box
Cylindrical or conical body, or wall structure
C215S012100, C215S383000, C215S395000, C215S390000, C220S771000, C229S101000
Reexamination Certificate
active
06216942
ABSTRACT:
BACKGROUND
1. Field of the Invention
This invention relates to a pack or packaging system for pourable goods or material, such as liquids or small free-flowing granules, and more particularly to a packaging system including an inner, polygonal blown plastic container accommodating the material to be packaged, and a sleeve-like cardboard jacket which surrounds the blown plastic container and is positively fixed thereto.
2. Discussion of Related Art
One such pack has been widely marketed by Applicants for years and has proved successful. This known pack substantially corresponds to the pack described in Applicants' DE 39 21 258 C2. In relation to that pack, the commercially available pack was further developed to the extent that at least one indentation in the blown plastic container resembles a half-drop in shape and the foldable part of the cardboard jacket is in the form of an equal-sided triangle of which two sides are arranged symmetrically to a corner fold line of the jacket in the shape of a V and are joined to the jacket via fold lines, while the third side of the triangle is arranged transversely of this corner fold line of the jacket and is in contact with the jacket via a die-cut line. Simply by pushing in this part of the jacket, it folds into the corresponding indentation of the blown plastic container and holds the jacket firmly on the container.
If, in the earlier solution, the foldable part, i.e. the triangle, is folded inwards into the indentation in the blown plastic container, the two halves of the previously horizontal side of the region slope at an angle of about 60° in relation to the vertical corner edge of the jacket. However, it has been found in practice that the blown plastic container is able to slide out of the jacket. This is attributable to the fact that, under load, i.e. when the blown plastic container shifts in the cardboard jacket, the sloping edges of the jacket lying in the indentation tend to give way outwards, creating slackness between the blown plastic container and the jacket with the result that, ultimately, the blown plastic container is able to slide out of the jacket.
SUMMARY OF THE INVENTION
With the problems of the prior art in mind, an object of the present invention is to further develop a pack of the type mentioned above in such a way that a more secure connection between the blown plastic container and the jacket is established without increased production and assembly costs, and without any danger of the blown plastic container sliding out of the plastic jacket.
According to the invention, this problem is solved by a pack of the type mentioned at the beginning which is improved by making the polygonal part of the jacket quadrangular, with the V-shaped fold lines merging into two die-cut lines which taper to a point, and further including the corner-shaped indentation being bordered by flat surfaces in adaptation to this region of the jacket.
Compared with the known pack in which the folded-in part of the jacket only rests in the drop-shaped indentation at certain points, the further development according to the present invention is distinguished by the fact that the folded-in part of the jacket lies in the cube-shaped indentation along a line or over an area in a manner providing that the complete open push-in edge of the jacket lies on the area of the depression of the container indentation. In the folded-in position, the die-cut lines taper to a point, and extend substantially horizontally and exactly adjoin the corresponding flat surface of the indentation, whereby the resulting linear positive connection is capable of absorbing far greater pressures compared to prior packaging systems. This guarantees a very secure locking effect between the blown plastic container and the jacket. The production and assembly costs of the pack are not increased because only the indentation has to be differently shaped in the blow molding process and the die cutting of the cardboard blank slightly modified.
Another advantageous embodiment of the invention includes the provision of at least two differently oriented corner-shaped indentations to provide the jacket with two foldable regions. This embodiment provides for an even more secure locking effect between the blown plastic container and the surrounding jacket.
In one particularly preferred embodiment, the corner-shaped indentations are respectively oriented towards the upper and lower ends of the blown plastic container.
REFERENCES:
patent: 2723795 (1955-11-01), McKenzie
patent: 5322184 (1994-06-01), Bergner et al.
patent: 5503281 (1996-04-01), Bergner et al.
patent: 5524787 (1996-06-01), Blake et al.
patent: 39 21 258 C2 (1995-06-01), None
patent: 44 45 213 A1 (1996-06-01), None
patent: 0082574 (1956-12-01), None
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Mai Tri M.
Murphy Glenn E.J.
Shoap Allan N.
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