US3360181A - Reinforced carton - Google Patents

Description

REINFORCED CARTON Filed June 17, 1966 2 Sheets-Sheet 1 'I' l /6 20 I6 3 20 /6 20 /6 Thomas M. W/'/s0n,ZZT

ATTORNEY INVENTOR Dec. 26, 1967 M. WILSON m REINFORCED CARTON 2 Sheets-Sheet Filed June 17, 1966 INVENTOR Thomas M. I W/'/s0n,1ZZ

BY Maw u W ATTORNEY United States Patent 3,360,181 REINFORCED CARTON Thomas M. Wilson III, Western Run Road, Cockeysville, Md. 21030 Filed June 17, 1966, Ser. No. 558,415 Claims. (Cl. 229-37) This invention relates generally to folded blank boxes, and more particularly it pertains to double strength cardboard cartons.

Wherever nails, wood screws, bolts or the like are to be packaged, it is desirable to use extra strength cartons. Since in stock and in shipment it is expected such heavy articles will be stacked one upon the other, a single-ply wall is of insuflicient strength.

Up to the present time, the practice has been to use an overlapped construction of two pieces, thus requiring two blanks. Another industry practice employs a zig-zag fold giving a three-ply side wall from a single blank. The disadvantage of the two blank construction is obviously the extra handling required and the difiiculty of getting correct register of the creasing and slits prior to the gluing operation to result in a single thickness top and bottom flaps and double thickness side wall.

The zig-zag fold is not applicable to a two-ply side wall although it has a great advantage in automatic register with its single blank, but, of course, is a costly, unduly thick and heavy carton, three-ply where two-ply would suffice and must be glued on two sides.

Both prior styles of reinforced cartons as well as unreinforced types are subject to a tendency to be crooked at manufacturers joint or to have what is known in the industry as points. This is due to lack of keying of the flap to the sides.

Accordingly, it is an object of this invention to provide a two-ply carton which is fabricated from a single blank for more economical, accurate fabrication with none of the prior disadvantages.

Another object of this invention is to provide a carton blank having little waste material which when folded is self registering as to creasing and slits and results in a carton with a strong keyed-together flap and side wall to avoid pointing effect.

Still another object of this invention is to provide a folded one piece blank reinforced wall carton which requires gluing on one side only.

Other objects and attendant advantages of the invention will become more readily apparent and understood from the following detailed specification and accompanying drawings in which:

FIG. 1 is a perspective drawing showing the completely assembled carton incorporating features of this invention;

FIG. 2 is a view illustrating the blank for the carton of FIG. 1;

FIG. 3 is an enlarged detail cross section taken on line 33 of FIG. 2;

FIG. 4 illustrates in perspective the initial stage in overlapping the blank of FIG. 2 to form a carton;

FIG. 5 is a section taken on line 55 of FIG. 4;

FIG 6 is a perspective view showing a later stage in the folding of the carton blank to form the carton of FIG. 1; and

FIG. 7 is a cross section of a portion of a two ply carton constructed of corrugated material.

Referring now to the details of the invention, the carton 10 shown in FIG. 1 is formed from a one-piece blank 12 cut from suitable sheet material such as cardboard or corrugated board as illustrated in FIG. 2. The blank 12 has longitudinal scores or creases 14 which guide the fold ing of the closure flaps 16 for the carton when it is to be erected. Transverse scores or creases 18 with slots 20 extended, therebeyond are for folding the side panels 30 and more completely define the closure flaps 16.

A side stitching or glue flap 22 is formed on one end of the blank 12 by notching the corners away down to the longitudinal score lines 14. The blank 12 is slit on its approximate longitudinal center line at reference 24 terminating short of both ends a distance equal to the width of the glue flap 22 where transverse slits 26 approximately one half the depth of the finished carton in length extend oppositely at right angles.

From the ends of each transverse slit 26, 28 and 29, respecitvely, extend to the adjacent end of the blank 12 and, in the case of corrugated'paper, these creases 28, 29 may be slit-scored or perforated for suitable hinging depending on the thickness of such material.

Thus, the blank 12 provides an inner wall 32 and an outer wall 34 to make up the two plies of the completed side panels 30. A layer of glue 36 is now applied to the inner face of wall 34. The walls 32 and 34 are next brought into contact by lifting the lower half of the blank 12 and superimposing it upon the other, hinging taking place at the creases 28 and 29 as best shown in FIGS. 4 and 5. This operation forms an extra thickness key step 37 both on the glue flap 22 as well as on the opposite end of the now partially folded blank 12.

The carton 10 is completed (in the flat) by bringing the glue flap end 22 and the opposite end 38 proximate by folding on adjacent transverse scores 18 so as to meet over the central transverse score 18. The key steps 37 will then interlock to accurately position the flap 22 for stitching or gluing to opposite end 38 without danger of accidental misregister.

If this seam thus formed is too thick because of the thickness of corrugated paper used, it is possible to first compress the blank 12 at the hatched areas shown in FIG. 2 by crushing the material as shown in FIG. 3.

The carton 10 is erected for use in the usual manner by expanding the four side panels 30 and folding in the bottom and top closure flaps 16 as shown in FIG. 1.

If desired, the carton 40 can be constructed of corrugated material, such as corrugated fiberboard as shown in FIG. 7. The superimposition of the flutes in the twoply side sections 42 and 44 of the carton 40 is, by design and construction, more suitable to creasing or scoring for the forming of accurate folded corners than any other possible flute arrangement. The upper and lower superimposed flute arrangement of the two- ply side sections 42 and 44 allow the flutes to react in a complementary fashion under the stress of folding as shown in FIG. 7.

Obviously many modifications and variations of the present invention are possible in light of the above teachings, It is, therefore, to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

What is claimed is:

1. In a carton comprising panels, one of said panels having a side flap overlapping another of said panels for securement thereto to form said panels into the sides of said carton, and top flaps and bottom flaps extending from said panels for forming the top and bottom closures, respectively, of said carton, the improvement comprising said panels being of two-ply material and said top and bottom flaps being of single-ply material, with said side flap having a single-ply portion and a multi-ply portion to form a first key step and with said another of said panels having a single-ply portion and a multi-ply portion to form a second key step which is complementary to said first key step.

2. The improved carton of claim 1 formed from a single carton blank.

3. The carton blank of claim 2 having a pair of longitudinal creases for dividing said blank into a top flap porfolding creases tion, a panel portion, and a bottom flap portion, a longitudinal slit extending substantially midway between said longitudinal creases and terminating substantially the width of said first and second key step short of the ends of said blank for dividing said panel ortion into an outer panel portion and an inner panel portion, transverse creases in each said panel portion to form said panels, said transverse creases terminating into slots in said top flap portion and said bottom flap portion to form the flaps in each said portion, a first transverse slit extending from one end of said longitudinal slit and terminating short of one said longitudinal creases, a second transverse slit extending oppositely from the other end of said longit-udinal slit and terminating a complementary distance short of the other of said longitudinal creases, and longitudinal creases extending from each end of each said transverse slits to the corresponding ends of said blank, whereby said inner panel portion can be shifted over on top of said outer panel portion to form said panels of twoply material, with said top and bottom flaps remaining single-ply material.

of a single-ply of material.

References Cited UNITED STATES PATENTS 2,324,757 7/1943 Botley 22937 2,344,999 3/1944 Newsorn 22937 XR 3,114,494 12/1963 VVashyluka 22937 3,189,249 6/1965 Fallert 22937 3,190,533 6/1965 Larson 229--37 XR 3,190,535 6/1965 Nute 22937 DAVIS T. MOORHEAD, Primary Examiner.

Claims (1)

1. IN A CARTON COMPRISING PANELS, ONE OF SAID PANELS HAVING A SIDE FLAP OVERLAPPING ANOTHER OF SAID PANELS FOR SECUREMENT THERETO TO FORM SAID PANELS INTO THE SIDES OF SAID CARTON, AND TOP FLAPS AND BOTTOM FLAPS EXTENDING FROM SAID PANELS FOR FORMING THE TOP AND BOTTOM CLOSURES, RESPECTIVELY, OF SAID CARTON, THE IMPROVEMENT COMPRISING SAID PANELS BEING OF TWO-PLY MATERIAL AND SAID TOP AND BOTTOM FLAPS BEING OF SINGLE-PLY MATERIAL, WITH SAID SIDE FLAP HAVING A SINGLE-PLY PORTION AND MULTI-PLY PORTION TO FORM A FIRST KEY STEP AND WITH SAID ANOTHER OF SAID PANELS HAVING A SINGLE-PLY PORTION AND A MULTI-PLY PORTION TO FORM A SECOND KEY STEP WHICH IS COMPLEMENTARY TO SAID FIRST KEY STEP.

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