Envelopes – wrappers – and paperboard boxes – Paperboard box – Including a polygonal – nonrectangular wall
Patent
1997-07-18
1999-02-23
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
Including a polygonal, nonrectangular wall
2291032, 2291601, 206268, B65D 500
Patent
active
058735143
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a carton or pack which may be used for a wide variety of purposes.
Many cartons have been used hitherto, which are of square or rectangular cross-sectional shape. Circular-section tubular containers have also been commonly used hitherto, particularly for carrying rolled-up maps or drawings for example. Such circular-section tubular containers suffer the disadvantage that it is often difficult to remove the rolled-up product from the container, either because access to the end of the rolled-up product through the end of the tube is difficult, or because the rolled-up product is retained too tightly by friction against the inner surface of the tube.
I have now devised a carton or pack which is easier to use, for carrying rolled-up products, than the conventional tubular container, but which may also be used, suitably dimensioned, to contain other products.
In accordance with this invention, there is provided a carton or pack of triangular cross-section, said carton or pack being formed from a blank of sheet material which is provided with a series of folds dividing the blank into a plurality of panels, the blank being folded up along successive said fold lines to form an inner lining and a triangular section outer shell around said inner lining.
The carton or pack can accordingly be made from a blank of relatively thin sheet material, but achieve high strength.
Preferably at least one end of the blank has a triangular end piece projecting therefrom to close the corresponding end of the carton or blank.
Preferably the or each triangular end piece is retained in a closed position, across the corresponding end of the carton or pack, by retainer flaps hinged to the end piece and inserted between said inner lining and outer shell of the carton or pack. This provides a simple yet effective arrangement for closing the end of the carton whilst avoiding the use of adhesive or other means of retention.
Preferably the carton or pack has an end portion which can be opened by flexing about a fold line extending across a base side of the carton at a position inset from the respective end of the carton.
This carton can be used to contain a rolled-up product without excessive frictional engagement between the product and the inner surfaces of the carton, because the two engage each other only along three discrete lines of contact. Further, by providing an end portion of the carton which can be hinged open, the end of the rolled-up product becomes easily accessible: often, the end of the rolled-up product will extend beyond the end of the main portion of the carton; in any event, there is space at the vertices of the carton for the user to insert his fingers and grip the rolled-up product to withdraw it.
Preferably the two sides of the carton are equal, so that its cross-sectional shape is that of an isosceles triangle. The two sides and the base may all be equal to one another, so that the carton cross-sectional shape is that of an equilateral triangle. Alternatively, the two sides and the base may be tapered such that one end of the carton or pack is wider than the opposite end.
Preferably the inner lining projects beyond the end of the outer shell at the end of the main portion of the carton. Accordingly, the hinged end portion of the carton frictionally engages over the projecting end of the inner lining, when this end portion is closed, to hold the latter in its closed position. Preferably the end of the outer shell inclines from the hinge line to the apex opposite the hinged base, away from the end of the carton.
Also in accordance with this invention, there is provided a carton or pack of triangular cross-section comprising a base and two sides, the carton or pack being formed from a blank which is provided with a series of folds dividing the blank into a plurality of panels, the blank being folded up along successive fold lines, and the carton having an end portion which can be opened by flexing about a fold line extending across said base at a position inset from the end of the carton.
The
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Elkins Gary E.
Mai Tri
Schindler Edwin D.
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