US 5,289,781 AGranted

Corrugated pallet leg and method

AssigneePacking Materials Corporation

InventorBruce C. Beckway

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Abstract

There is disclosed an improved corrugated pallet having pallet legs attached at various points of attachment. The field of invention relates to a corrugated cardboard pallet of the type generally formed by a pair or more of pallet decks which are stacked atop one another, each of which has finger elements die cut therein radiating outwardly from a central circle and terminating on a circular score line of substantially the same diameter as the inner diameter of one of the leg elements. The die cut lines for the fingers radiate tangentially outwardly to create a substantially spiral pattern. The leg assembly is of the type formed by an outer leg, and an inner leg, with the radiating die cut fingers nested between the annulus created between the outer and inner leg and adhesively secured to the legs. The improvement consists of die cutting a series of linearly aligned perforations along the length of each finger, such that when the adhesive is applied to the outer and inner surfaces of the fingers, the adhesive is permitted to permeate the inner confines of the corrugated material forming the fingers thereby increasing the surface area of adhesive for securing the finger elements to the respective leg elements.

Claims8

Dependent claims

In a pallet of the type formed by a pallet deck having a plurality of tubular legs attached thereto, wherein each of the tubular legs is formed from an inner leg and an outer leg element, and wherein the pallet deck is formed of at least two pallet deck members of corrugated cardboard stacked together atop one another and each of the pallet deck members at each leg attachment point having a plurality of finger elements formed of die-cut lines radiating outwardly from a central circle and terminating on a circular score line of substantially the same diameter as the inner diameter of an outer leg element, the finger elements being die cut in the respective ones of the pallet deck members, the inner and outer leg members being proportioned to nest within one another and to retain the finger elements die cut in both pallet deck members within the annulus formed between the nested inner and outer leg elements, and wherein the tubular legs are secured to the pallet deck and the pallet deck members are secured together one atop the other by placing an outer leg element under the stack pallet deck members and aligned with the circular score line, the inner leg element atop the stack deck members and aligned with the circular score line, applying an adhesive on the finger elements and pressing the inner leg element through the pallet deck members into the outer leg element with the finger elements being captured in overlapping relationship between the outer and inner leg elements, and spreading the adhesive therebetween,

the improvement comprising,
each of said finger elements die cut in each of said pallet deck members being provided with a series of linearly aligned perforations die cut therein and extending from a point spaced slightly inwardly from said circular score line having substantially the same diameter as the inner leg element, and terminating at a point spaced inwardly from the central circle,
said perforations allowing the adhesive applied to said finger elements to permeate said finger elements thereby to increase the surface area of the adhesive relative to the finger elements, which secures said leg elements to said fingers,
whereby the resulting strength of said leg elements relative to said pallet deck is increased by a factor of between ten (10%) percent and forty (40%) percent.

1 more element

In a method of manufacturing a pallet which includes the steps of forming a pallet deck of at least two corrugated cardboard pallet deck members stacked together atop one another, and die cutting in each of the pallet deck members at each leg attachment point a plurality of finger elements formed of die-cut lines spirally radiating outwardly from a central circle and terminating on a circular score line, providing a plurality of pallet legs, each of which is formed of inner and outer leg elements being proportioned to nest within one another and to retain the finger elements die cut in both pallet deck members at a leg attachment point in overlapped relationship with the annulus formed between the nested outer and inner leg elements, applying an adhesive on the surfaces of each finger element, and wherein a further step is provided by securing the pallet deck members together and the pallet legs to the pallet by placing an outer leg element under the stack pallet deck member and aligned with the circular score line, an inner leg element atop the stack deck members and aligned with the circular score line, and forcibly inserting the inner leg element into the outer leg element with the finger elements being captured between the outer and inner leg elements by pressing the inner leg element through the stack pallet deck members into the outer leg element, thereby to spread the adhesive and allow the finger elements to adhesively secure to the leg elements,

the improvement comprising, die cutting a series of linearly aligned perforations extending from a point spaced slightly inwardly from the circular score line, and terminating at a point spaced inwardly from the central circle,
and allowing the adhesive applied to secure the finger elements to the respective inner and outer leg elements to permeate the inner confines of the corrugated pallet deck members,
whereby the resulting corrugated pallet manufactured in accordance with the above method increases the relative strength of the attachment of the leg elements to the pallet deck by a factor of between ten (10%) percent and forty (40%) percent.

Dependencies are inferred from the claim text.