1) Field of the Invention
The present invention relates to protective packaging materials, and more particularly to an edge protector for placement on the interior or exterior of an article or container, which is uniquely constructed and arranged to maintain its shape for providing reinforcement and protection to the corners of articles and container while also being simple, fast and economical to assemble.
2) Background of the Invention
Edge protectors, corner posts, and the like are generally known in the packaging industry to prevent damaged to the edges of articles, as well as add strength to lightweight containers such as cardboard boxes to prevent crushing when stacked.
The prior art is replete with edge or corner protectors, or corner post supports. Examples can be found in U.S. Pat. Nos. 3,613,985; 3,982,682; 4,247,289; 4,399,915; 4,771,893; 5,431,985; 5,813,537; and 6,595,367, each of which have one or more of the following problems. While some provide good cushioning protection, they do not provide a load bearing capacity that strengthens a lightweight container sufficiently to allow for heavy stacking of multiple containers. Others that do provide structural reinforcement tend to be bulky, requiring large amounts of material that wastes valuable packaging space and add unwanted weight to the container. In either case, most protectors are typically expensive and time consuming to manufacture. Additionally, and perhaps the worst problem with most corner protectors is that they fail to hold their shape, causing them to be difficult to handle and properly place in a container or around the edge of an article. Sometimes, the edge protector may deform after it is placed in the container, leading to a structural collapse of the container and damage to the item contained therein.
Accordingly, it is an object of the present invention to provide an edge protector that maintains its shape once folded.
It is another object of the present invention to provide an edge protector that is easy and fast to assemble while being economical to produce.
It is another object of the present invention to provide an edge protector that works both as a cushioning member to protect articles, as well as a structural reinforcing member when placed in a container.
The above objectives are accomplished according to the present invention by first providing a blank sheet of foldable material having a top side and a bottom side.
A plurality of fold lines are scored into the sheet dividing the sheet into at least six consecutive panels to allow for easy folding of the panels into overlapping engagement. A first leg is formed from the overlapping of panels two, three, and six so that a top side of panel two is placed in face-to-face contact with a top side of panel three, and a top side of panel six is placed in face-to-face contact with a bottom side of panel two. A second leg is formed from the overlapping of panels one, four, and five so that a top side of panel one is placed in face-to-face contact with a top side of panel four, and a top side of panel five is placed in face-to-face contact with a bottom side of panel one. An adhesive is included between the face-to-face contact of panels two and three, panels one and four, panels one and five, and panels two and six for securing the panels in overlapping engagement to maintain the first and second legs in a fixed folded arrangement with each other.
In a further advantageous embodiment, panels three and four are of unequal width so that the first leg may be formed longer or shorter than the second leg, and wherein panel two has a width less than that of panel three, panel one has a width less than that of panel four, panel five has a width greater than that of panel one and less than that of panel four, and panel six has a width less than that of panels two and three.
In an alternative embodiment, panels three and four are of equal width and panels one, two, five and six each have a width less than panels three and four individually. Panel one has a width less than the width of panel two, panel five has a width greater than the width of panel one and panel two individually, and panel six has a width less than or equal to panel 2.
In a preferred embodiment, the first leg and the second leg intersect at approximately a 90° angle with each other.
Preferably, the blank sheet of foldable material comprises corrugated paperboard.
In a further advantageous embodiment, the fold lines scored between panels one and two, and panels five and six, are scored on the bottom side of the sheet, and the fold lines between panels two and three, panels three and four, and panels four and five are scored on the top side of the sheet.
Advantageously, a double score fold line may be included to connect panel four and panel five, wherein the double score fold line includes a pair of fold lines laterally spaced approximately the thickness of the sheet for allowing panel five to be double hinged to panel four so that when panel five is folded into overlapping engagement with panel one, the double score allows panel five to easily fold around the thickness of panel one.
The above objectives are further accomplished according to the present invention by providing a method of preparing a box edge protector comprising the steps of providing a blank sheet of foldable material having a top side and a bottom side; scoring fold lines into the sheet so that the sheet is divided into at least six consecutive panels to allow for easy folding of the panels into overlapping engagement; folding the sheet to position a top side of panel two in face-to-face contact with a top side of panel three, and to position a top side of panel one in face-to-face contact with a top side of panel four; folding the sheet to position a top side of panel five in face-to-face contact with a bottom side of panel one, and to position a top side of panel six in face-to-face contact with a bottom side of panel 2; and, folding the sheet at the fold lines between panels one and two, three and four, and five and six so that the overlap of panels two and three and six form a first leg intersecting with a second leg formed by the overlap of panels one, four and five.
In a preferred embodiment, the method also includes the step of scoring the fold line between panels one and two, and panels five and six on the bottom side of the sheet, and scoring the fold lines between panels two and three, panels three and four, and panels four and five on the top side of the sheet.
In a further advantageous embodiment, the method includes the step of folding the sheet to position said first leg at an angle to said second leg.
Additionally, the preferred method includes the step of placing an adhesive on the top side of panels three, four, five and six prior to folding for securing the panels in overlapping engagement when folded.
Advantageously, the method includes the step of spacing the fold lines so that panels three and four are of unequal width so that said first leg may be formed longer or shorter than said second leg, and wherein panel two has a width less than that of panel three, panel one has a width less than that of panel four, panel five has a width greater than that of panel one and less than that of panel four, and panel six has a width less than that of panels two and three.
In an alternative method, the steps include spacing the fold lines so that panels three and four are of equal width and panels one, two, and five are of unequal width each having a width less than panels three and four individually. Preferably, method includes the step of spacing the fold lines so that panel one has a width less than the width of panel two, panel five has a width greater than the width of panel one and panel two individually, and panel six has a width less than or equal to panel 2.
Preferably, the method includes the step of arranging said first leg and said second leg to intersect at approximately a 90° angle with each other.
In a further advantageous embodiment, the method includes the step of scoring a double score fold line between panel four and panel five wherein said double score fold line includes a pair of fold lines laterally spaced the thickness of the sheet for allowing panel five to be double hinged to panel four so that when panel five is folded into overlapping engagement with panel one, the double score allows panel five to easily fold around the thickness of panel one.
The construction designed to carry out the invention will hereinafter be described, together with other features thereof. The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawings forming a part thereof, wherein an example of the invention is shown and wherein:
a-d shows side views of the corrugated cardboard blank in various folding stages to illustrate the construction of the edge protector according to the present invention;
a-10d show side views of the corrugated cardboard blank in various folding stages to illustrate the construction of the edge protector according to the present invention.
With reference to the drawings, the invention will now be described in more detail. Referring to
Referring to
To prepare sheet 10 for folding, a plurality of parallel fold lines 16a-d are scored into sheet 10 and laterally spaced to divide the sheet into five consecutive panels numbered 1-5. The panels are accordingly hinged together at the scored fold lines to allow for easy folding of the panels into overlapping engagement. It is of particular importance that fold line 16a scored between panels 1 and 2 be scored on bottom side 14 of sheet 10, while the rest of fold lines 16b-d are scored on top side 12 of sheet 10. As is described in detail below, it is necessary for panel 1 to fold in an opposite manner as the rest of the panels, thereby necessitating fold line 16a to be scored on the bottom side of the sheet.
As shown in
Referring to
By way of example, a preferred embodiment of the invention to be most commonly used provides an edge protector with 2½″ legs for wrapping around corners of articles and strengthening the interior corners of shipping containers. To provide the embodiment with 2½″ legs that meets the other requirements set forth above as to panel width, requires sheet 10 to be approximately 1{fraction (13/4)}″ in overall width with any desired length. The thickness of the material often ranges anywhere from {fraction (1/16)}″ to ¾″ or bigger. Preferably, the sheet material is between {fraction (1/16)}″ to {fraction (3/16)}″ and for this particular embodiment is {fraction (2/16)}″. Based on this overall width of 11¾″, panel 1 has a width of approximately 2{fraction (1/16)}″, panel 2 has a width of approximately 2{fraction (5/16)}″, panels 3 and 4 as noted above have a width of approximately 2½″, and panel 5 has a width of approximately 2⅜″. This allows the panels to fit together without any gaps between engaging surfaces and corners of the panels. It should be noted that the corners must be folded sharply or gaps will form between the panels, leading to a failure of the edge protector to hold its shape. By way of comparison, to provide an embodiment with 3″ legs that meets the other panel width requirements set forth above, requires sheet 10 to be approximately 14⅛″ in overall width with any desired appropriate length and a thickness of {fraction (2/16)}″. Based on this overall width of 14⅛″, panel 1 has a width of approximately 2{fraction (9/16)}″, panel 2 has a width of approximately 2{fraction (13/16)}″, panels 3 and 4 have a width of approximately 3″, and panel 5 has a width of approximately 2⅞″.
Generally, after sheet 10 has been scored, the sheet is then folded at fold line 16b between panels 2 and 3 to overlap panels 3 and 4 with panels 1 and 2 so that top side 12 of panel 2 is placed in face-to-face contact with top side 12 of panel 3, and top side 12 of panel 1 is placed in face-to-face contact with top side 12 of panel 4. As shown in
Referring to
Next, sheet 10 is folded at fold line 16d between panels 4 and 5 so that top side 12 of panel 5 is placed in face-to-face contact with bottom side 14 of panel 1, which locks the panels together in position through a combination of the folding arrangement and the adhesive discussed above provided in the form of glue lines 22a-c. This forms second leg 20 intersecting with first leg 18. Accordingly, second leg 20 is thus formed from folding sheet 10 to overlap panels 1, 4, and 5 so that the top side of panel 1 is placed in face-to-face contact with the top side of panel 4, and the top side of panel 5 is placed in face-to-face contact with the bottom side of panel 1.
Preferably, the first leg and the second leg intersect at approximately a 90° angle with each other to provide an edge protector for right angles, as well as to reinforce the edges of paperboard boxes and the like. Accordingly, referring to
Referring to
Referring to
It is advantageous to score fold lines 16a and 16e on bottom side 14 of sheet 10, while the rest of fold lines 16b-d are scored on top side 12 of sheet 10. As noted above, it is necessary for panel 1 to fold in an opposite manner from panels two, three, four and five, thereby necessitating fold line 16a to be scored on the bottom side of the sheet. Panel 6 also folds in an opposite direction from all the panels except panel 1, thus requiring a score line on the bottom of sheet 10 to promote folding. While placing score lines 16a and 16e on bottom side 10 is preferable, it is not essential and the folding arrangement described herein can be accomplished regardless.
Glue lines 22a-d are placed on top side 12 of panels 3, 4, 5 and 6. As compared to the five panel embodiment, the addition of glue line 22d is necessary to secure panel 6 to bottom side 14 of panel 2 when folded. By placing glue line 22d on top side 12 of panel 6, all the glue can be place on a single side of sheet 10 during assembly so that additional glue does not have to be added during the folding process.
The preferred embodiment for the five panel embodiment described above sets forth that panels 3 and 4, which form the length of legs 18 and 20, are to be of equal length. However, for both the five and six panel embodiments, it is not necessary for panels 3 and 4 to be of equal lengths. This allows for unique applications in which one leg of the edge protector can be formed longer or shorter than the other leg (i.e. where it is preferred to have a 2″ by 4″ leg arrangement).
Referring to
In a further advantageous embodiment, panels 3 and 4 may be formed of an unequal width so that first leg 18 may be formed longer or shorter than second leg 20. Regardless of the length of panels 3 and 4, panel 2 will have a width less than that of panel 3, panel 1 will have a width less than that of panel 4, panel 5 will have a width greater than that of panel 1 and less than that of panel 4, and panel 6 has a width less than that of panels 2 and 3.
In an alternative embodiment, panels three and four may be constructed of equal width with panels 1, 2, 5 and 6 each have a width less than panels 3 and 4 individually.
While a preferred embodiment of the invention has been described using specific terms, such description is for illustrative purposes only, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims.
This application is a continuation-in-part of application Ser. No. 10/686,228, filed Oct. 15, 2003.
Number | Date | Country | |
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Parent | 10686228 | Oct 2003 | US |
Child | 11029922 | Jan 2005 | US |