JPH07149372A - Foldable packing for corner - Google Patents

Abstract

PURPOSE:To provide a foldable packing for corner which is built up into a solid shape such as that steps for double stacking with a specified interval are bent into an L-shape in the horizontal direction, from only one sheet of a sheet material, and is equipped with cushioning capability which is equal to a conventional packing made of polystyrene foam. CONSTITUTION:For sheet materials 101, 102, a rectangular area being equipped with a central folding line A is made into a back surface piece 1 which becomes a back surface of a step, and at the upper and lower both edges of the back surface piece, a lower step-forming piece 2 and upper step-forming piece 4 which respectively form a lower step part and upper step part of steps by being bent into a form with a cross section of U-shape, are connected by a folding line under a split condition into right and left sides with the central folding line A as the border. Then, on one of both side parts of the lower step-forming piece, fastening parts 12, 21 to fix the built-up shape of the packing are formed, and on the other part, parts to be fastened 14, 22 are provided for the constitution. Also, reinforcing pieces 6, 10, 15 which help to strengthen the step structure and to impart cushioning property are formed by erecting into cut and raised forms. In stead of folding the sheet materials into upper and lower step parts, they may be folded into front and rear step parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a box-like outer shape,
For example, it is a folding type made of sheet material such as corrugated cardboard that plays a role of replacing the conventional Styrofoam packing that was applied to the corners when packing electrical appliances such as microwave ovens and various furniture Regarding packing for corners.

[0002]

2. Description of the Related Art The above-mentioned styrofoam corner packing 500 has, for example, a form as shown in FIG. 14, and its recessed portion 500a is applied to a corner of a packaged article and fixed by an appropriate means. Was. Alternatively, a corner packing having a shape similar to the packing 500 has been assembled from a thick plate-like material obtained by laminating a plurality of cardboards.

[0003]

However, since the styrofoam packing is made of finite and precious petroleum, it is desirable to avoid waste as a packing material that is thrown away only once. Moreover, the used Styrofoam packing has a serious problem that it emits high heat when burned and seriously damages the incinerator, and that if it is landfilled, the ground will not be stable forever. Further, the laminated corrugated cardboard is made of recyclable wood and has almost no problems in disposal, but it takes too much time for manufacturing processes such as bonding and molding. And since each packing made of conventional Styrofoam and corrugated board is bulky,
There was a problem that storage and transportation costs increased. Therefore, the object of the present invention is to easily and quickly fold a single sheet material such as corrugated cardboard into a required three-dimensional shape, and the manufacturing, storage, and transportation costs are all sufficiently higher than those of conventional ones. (EN) It is possible to provide a foldable corner packing which is held down low and has cushioning performance comparable to that of styrofoam.

[0004]

In order to achieve the above object, the folding corner packing according to the present invention is achieved by simply bending one sheet material 101, 102, 103 along a fold line. , Three-dimensional packing 201, 2 having a predetermined width and two-tiered stairs bent horizontally into an L shape
02 and 203 are configured to be folded up,
In the sheet materials 101 and 102, a rectangular area having a central fold A for bending into the L-shape is used as a back piece 1 which is a back portion of the stairs, and a cross section of a cross section is formed at a lower edge of the back piece 1. The lower-stage forming pieces 2 that are bent in a letter shape to bend and form the lower-stage portion 201A of the staircase are continuously provided through the folds B in a state of being divided into left and right sides with the central fold A as a boundary. An upper step forming piece 4 which is bent in a U-shaped cross section to bend and form the upper step portion 201B of the stairs at the upper edge of
In order to fix the folded shape of the packing, in order to fix the folded shape of the packing, in order to fix the folded shape of the packing, The joint portions 12 and 21 are provided, and on the other side, the engaged portions 14 and 22 are provided. Then, as the engaging portion 12 and the engaged portion 14, it is preferable to provide engaging protrusions and engaging notches on the left and right sides of the bottom surface 2A of the lower stage forming piece 2. Alternatively, as the engaging portion 21 and the engaged portion 22, a cut 21 for forming a stepped portion b is provided on one of the left and right sides of the front wall surface 2B of the lower stage forming piece 2, and the side end on the other side is provided. 22
May be locked at this step portion b. or,
On the left and right sides of the back piece 1, a reinforcing piece 6 and an uprighting auxiliary piece 8 that enhance the structural strength of the lower portion and the upper portion, respectively.
It is advisable to provide cut-raising folds H, oblique folds I, and cut-raising cuts 7 and 9 which are formed in a cut-and-raised shape so as to extend over the upper and lower sides of the back piece 1, respectively. Further, the front wall surfaces 2B and 4B, which are the front surfaces of the lower portion and the upper portion, have reinforcing pieces 10 and 15 for increasing the structural strength of the upper and lower portions.
And the stand-up auxiliary pieces 11 and 16 are formed to stand up in a cut and raised shape,
The cut-and-raised folds J, K and the cut-and-raised cuts 3, 5 may be provided so as to straddle the upper and lower sides of the front wall surfaces 2B, 4B, respectively.
The sheet material 103 is provided with a central cutout 32, and a rectangular region bent in an L-shape in the surface direction is used as a bottom piece 31 which is the bottom of the stairs, and a front edge of the bottom piece 31 is provided. Is a U-shaped cross section and is formed by the front part 2 of the stairs.
The front stage forming piece 33 for bending 03A is continuously provided via the fold M in a state of being divided into left and right sides with the central cut 34 as a boundary, and the bottom edge piece 31 is folded in a U-shaped cross section. The upper stage forming piece 35 that is bent to form the second stage portion 203B of the staircase is connected to the left and right sides of the central fold S and the central cut line 36 through the fold N. , Corner packing 2 folded up
Strip-shaped fixing / reinforcing piece 1 to fix the shape of 03
04 may be attached, the fixing / reinforcing piece 104 may be bent into an L shape, and the fixing / reinforcing piece 104 may be inserted into a gap c formed between the front stage portion 203A and the rear stage portion 203B. In that case, the reinforcing piece 6 and its uprighting auxiliary piece 8 which reinforce the shape of the stairs in a buffer manner on both left and right sides of the bottom piece 31.
The cut-and-raised fold H, the oblique fold I, and the cut-and-raised cuts 7 and 9 for forming the cut-and-raised shape are provided so as to straddle both the front and rear sides of the bottom piece 31, and the front-stage forming piece 33 and the rear-stage forming The piece 35 reinforces each staircase shape in a buffer manner,
It is also possible to provide cut-and-raised folds J and K and central cuts 34 and 36 for forming the reinforcing pieces 10 and 15 and the standing-up auxiliary pieces 11 and 16 in a cut-and-raised shape, respectively.

[0005]

In order to fold up the corner packing 201 having a three-dimensional shape obtained by horizontally folding an L-shaped two-tiered staircase having a predetermined width from one sheet material 101, first, the central fold line is formed. The lower stage forming piece 2 and the upper stage forming piece 4 which are continuously provided on the upper edge and the lower edge of the rear surface piece 1 provided with A through the folds, respectively, and are divided into two left and right with the central fold A as a boundary,
Bend to the left and right separately in U-shape, and lower part 201
Fold up A and the upper part 201B. Then back piece 1
B is bent along the central fold line A into an L-shape, and the engaging portion 12 is fitted into the engaged portion 14, so that the corner packing 201 can be easily folded and the folded shape can be easily fixed.・ Can be done quickly. Then, the lower part 201A and the upper part 201
In the folding process of B, the reinforcing pieces 6, 10 and 15 for enhancing the structural strength of each and providing the cushioning property are naturally formed in a cut-and-raised shape. Also, when the corner packing 203 is folded up from the sheet material 103, the attached fixing / reinforcing piece 104 is bent into an L-shape so that a gap c is created between the front part 203A and the rear part 203B. When it is inserted, the folded shape of the packing is firmly fixed and the packing is reinforced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 4, the corner packing 20 of this embodiment is provided with a three-dimensional shape in which a two-tiered staircase with a predetermined frontage is bent horizontally in an L shape.
1 (inverted upside down in the figure) is easily and quickly folded up from the single corrugated board 101 shown in FIG. Since the corrugated board 101 is provided with folds, cuts, and the like at a plurality of required positions, the arrangement state thereof will be described in detail below.

In the rectangular corrugated board 101, the rectangular area occupying the substantially central portion thereof is used as the back piece 1 which constitutes the step-shaped back portion. In the middle of the back piece 1 in the left-right direction, a central fold A for bending the back piece 1 into an L shape.
Is provided.

At the lower edge of the back surface piece 1, a lower step forming piece 2 which is bent in a U-shaped cross section to form a lower step portion 201A of a staircase is continuously provided through a fold line B. The lower stage forming piece 2 is divided into two left and right by a cut 3 extending from the lower end of the central fold line A. In addition, the upper edge of the back piece 1 is bent in a U-shaped cross section to form an upper step 201B of the stairs.
The upper-stage forming pieces 4 for forming are formed continuously through the fold line C. The upper stage forming piece 4 is divided into two left and right by a cut 5 extending from the upper end of the central fold line A.

The lower-stage forming piece 2 has a form in which a bottom surface 2A, a front wall surface 2B and an upper surface 2C constituting the lower stage are successively connected via folds D and E. Also, the upper formation piece 4
Has a form in which the top surface 4A, the front wall surface 4B, and the lower surface 4C, which constitute the upper stage, are sequentially connected via folds F and G.

Near the right and left sides of the back piece 1, there are cut and raised cuts 7 for forming reinforcing pieces 6 and 6 in the shape of a plane L, which serve to reinforce the staircase shape in a buffered state. And a fold H for cutting and raising are provided respectively. This reinforcement piece 6
In order to assist the bending upright, the upright auxiliary pieces 8 having a substantially trapezoidal shape are continuously provided at both upper and lower edges of the reinforcing piece 6 through folds B and C.

As shown in FIG. 1, the upright assisting pieces 8 and 8 are directed toward the bottom surface 2A and the top surface 4A from both ends of the cut and raised fold line H at an angle of 45 degrees with respect to the fold lines B and C. It is formed so as to be surrounded by an oblique fold I having a predetermined length and extending from both side ends of the cut and raised cut 7 toward the bottom surface 2A and the top surface 4A.

Also, on the front wall surface 2B of the lower portion 201A,
Rectangular reinforcing piece 10 for reinforcing this staircase shape in a buffered state
The cut-and-raised cuts (folds) J and the cut-and-raised cuts for forming the cut-and-raised shape are provided. In this cut-and-raise cut, the cut 3 plays its role. Then, in order to assist the bending of the reinforcing piece 10, upright edges 11 and 11 of triangular shape are formed on the upper and lower edges of the reinforcing piece 10.
It is connected through. The upright auxiliary piece 11 extends from both ends of the cut-and-raised cut J at an angle of 45 degrees with respect to the folds D and E, and obliquely folds I across the bottom surface 2A and the top surface 2C.
And is surrounded by the cut 3. In addition, the portion indicated by the symbol a is a notch hole that assists the bending up of the reinforcing piece 10.

Furthermore, one of the upright auxiliary pieces 11 formed on the bottom surface 2A is provided with a cut 13 for forming a convex engaging projection (engagement portion) 12 so as to contact the oblique fold I. . Further, the other standing up auxiliary piece 11 formed on the bottom surface 2A is provided with a convex engaging notch (engaged portion) 14 into which the engaging protruding piece 12 is fitted so as to contact the oblique fold I. There is.

On the other hand, on the inner wall surface 4B constituting the upper step portion 201B, a cut-and-raise cut for bending and raising a pair of upright auxiliary pieces 15, 15 in the same manner as the inner wall surface 2B of the lower step portion 201A. (Fold) K and cut / cut 5
Is provided. Further, the standing reinforcing pieces 16 and 16 for assisting the standing of the reinforcing piece 15 are formed in the same manner as described above.

The upper and lower edge portions of the upper surface 2C of the lower step portion 201A and the lower surface 4C of the upper step portion 201B respectively interfere with the upright reinforcing pieces 6 and 6 when the packing 201 is folded up. In the place, the fitting slits 17, 1
8 are provided. The reinforcing pieces 6 and 6 are also provided with fitting slits 19 for the same purpose.

Next, the operation of the above configuration will be described. In order to fold up the corner packing 201 from one corrugated board 101, first, the left and right sides or one side portion of the central fold line A is folded up in a staircase shape. In order to do this, the folds B and C on both upper and lower sides of the back piece 1 and the front wall surfaces 2B and 4B are previously prepared.
The folds D, E and F, G on the upper and lower sides of each of the above are once bent downward and set with a crease.

After that, when the folds B to G are each bent upward at a right angle, as shown in FIG. 2, both the reinforcing pieces 6 and 6 provided on the back piece 1 and the respective reinforcing pieces 6 and 6 are provided. As the upright assisting piece 8 is pressed between the bottom surface 2A and the top surface 4A, both the reinforcing pieces 6 and 6 stand upright on the back surface piece 1. Similarly, the reinforcing piece 1 provided on the front wall surfaces 2B and 4B
0 and 15 also stand upright on the front wall surfaces 2B and 4B. When the folds B to G are completely bent at right angles, the lower-stage forming piece 2 and the upper-stage forming piece 4 are each bent in a U-shaped cross section, as shown in FIG.
The staircase shape is folded up while the upper surface 2C of 01A and the lower surface 4C of the upper step portion 201B are in contact with each other.

In the folding process, the fitting slits 17 and 18 provided on the upper surface 2C and the lower surface 4C respectively fold into the fitting slits 19 provided on both the reinforcing pieces 6 and 6 and are folded up. It can be performed without bearing and the folded shape is fixed. The staircase-shaped folded-up structure is bufferedly reinforced by a pair of reinforcing pieces 6, 10 and 15 formed upright at two positions on the left and right sides thereof.

Subsequently, when the other side portions on both the left and right sides of the central fold line A are folded up in a staircase shape in the same manner as described above, the folded state shown in FIG. 3 is obtained. In this state, each of the left and right staircases has a shape as if the front corner portion of the end portion in contact with the central fold line A is cut off at an angle of 45 degrees when seen in a plan view.

Therefore, if the central fold line A is bent forward by 45 degrees, the corner packing 201 having the shape shown in FIG. 4 is folded up. Then, finally, when the engaging protrusions 12 provided on both the left and right sides of the bottom surface 2A are fitted into the engaging notches 14, the folded shape is firmly fixed. Thus, unlike the description of the somewhat redundant folding process, the folding work of the corner packing 201 can be completed extremely easily and quickly.

An example of how to use the corner packing 201 is shown in FIG. 300 is a packaged article, and 400 is a cardboard box for packaging.

Next, the corner packing 202 according to the second embodiment of the present invention will be described with reference to FIGS. This corner packing 20 is folded up from the single corrugated board 102 shown in FIG. 6 into the form shown in FIG.
The second difference between the second embodiment and the corner packing 201 of the first embodiment lies in the method of forming the engaging portion and the engaged portion for fixing the folded shape of the packing.

That is, the cuts 3 and 5 extending vertically from both upper and lower ends of the central fold line A have a lateral width substantially equal to the width dimension of the top surface 4A. Then, the front wall surface 2B is cut off at a portion corresponding to the reinforcing piece 10 on the left side of the cut 3. In addition, the width dimension of the portion corresponding to the reinforcing piece 10 on the right side of the cut 3 is somewhat narrowed, and the portion corresponding to the cut-and-rare fold J is provided with a cut 21 so as to be extended to the upper and lower sides respectively. It is provided. When the packing 202 is folded up, the portion provided with the cut 21 becomes a shallow step portion b as shown in FIG. 8 to form an engaging portion. Then, the side edge 22 on the left side from the cut 3 of the front wall surface 2B is
The engaged portion is engaged with the cut 21.

The second difference is that the lower forming piece 2 has
Instead of forming the reinforcing pieces 10 and 10 by cutting and raising, the upper surface 2C
Reinforcing bent pieces 23 are connected to the lower edge of the right side portion from the cut 3 through the fold L. The upper forming piece 4 is
The labor required to stand up the reinforcing piece 15 on the right side of the cut 5 is saved, and the left side reinforcing piece 15 also has its upright auxiliary piece 16,
16 is missing.

The procedure for folding up the corner packing 202 from the corrugated board 102 is similar to that of the first embodiment.
Then, when the lower portion 202A and the upper portion 202B are respectively folded up and the central fold A is bent at a right angle, the step portion b (the cut 2 is formed on the right side portion of the front wall surface 2B.
The side end 22 of the left side portion of the front wall surface 2B is engaged with 1) to firmly fix the folded shape of the packing.

Next, a third embodiment of the present invention will be described with reference to FIGS. The corner packing 203 of this embodiment shown in FIG. 12 can be easily and quickly folded up from the single corrugated board 103 shown in FIG. Since the corrugated board 103 is provided with folds, cuts, and the like at a plurality of required locations, the arrangement state thereof will be described in detail below.

The rectangular corrugated cardboard 103 has a rectangular area occupying a substantially central portion thereof, and a packing 2 having a step shape.
The bottom piece 31 is the bottom of 03. Bottom piece 31
In the middle of the left and right (front and back in FIG. 10) direction, the bottom piece 3
Central cutout 3 for bending 1 into an L-shape in the plane direction
2 is provided.

At the front edge of the bottom piece 31 (the left edge in FIG. 10), the front-stage forming piece 33 is bent in a U-shaped cross section to form the step-shaped front-stage portion 203A (see FIG. 12).
Are continuously provided via fold lines M. This front stage forming piece 3
3 is divided into two left and right by a central cut 34 that extends in a state where the central cutout 32 is extended. The front-stage forming piece 33 includes a front wall surface 33A and a top surface 33 which form the front stage.
It has a form in which B and the back surface 33C are successively connected through fold lines O and P.

A rear-stage forming piece 3 is formed on the rear edge of the bottom piece 31 so as to be bent in a U-shaped cross section to form the step-shaped rear-stage portion 203B (which is taller than the front-stage portion 203A).
5 are connected in series through the fold line N. Rear formation piece 35
Has a form in which a back surface 35A, a top surface 35B and a front wall surface 35C, which constitute the latter stage, are sequentially connected via folds Q and R. Then, the back surface 35A is provided with a central fold S for bending this surface into an L shape. Also, top surface 3
5B and the front wall surface 35C are each divided into two parts by a central cut 36.

Near the left and right sides of the bottom piece 31, there is a cut-out for forming the flat L-shaped reinforcing pieces 6 and 6 which serve to reinforce the stepped shape of the packing 203 in a buffered state. A working cut 7 and a cutting and folding fold H are provided respectively. In order to assist the bending and standing of the reinforcing pieces 6, substantially trapezoidal standing-up auxiliary pieces 8 are connected to the front and rear edges of each reinforcing piece 6 via folds M and N.

As shown in FIG. 10, the upright assisting piece 8 extends from both ends of the cut and raised fold H toward the front wall surface 33A and the back surface 35A at an inclination of 45 degrees with respect to the folds M and N. It is formed so as to be surrounded by an oblique fold I having a length and an L-shaped cut 9 extending from both side ends of the cut and raised cut 7 toward the front wall surface 33A and the back surface 35A.

Further, on the front wall surface 33A of the front stage portion 203A, a cut-and-raised cut (or fold) J is formed for forming a rectangular reinforcing piece 10 for reinforcing the staircase shape in a buffer state in a cut-and-raised shape. It has cut and raised cuts. The central cut 34 plays the role of this cut-and-raise cut.
Then, in order to assist the bending of the reinforcing piece 10, the reinforcing piece 1
At the front and rear edges of 0, triangular upstanding auxiliary pieces 11 and 11 are continuously provided through folds O and P. This stand up aid piece 11
Is 4 from the both ends of the cut and raised cut J to the folds O and P.
It is formed so as to be surrounded by an oblique fold I extending toward the bottom surface piece 31 and the top surface 33B at an inclination of 5 degrees and a central cut 34. In addition, the part with the reference sign a is a notch hole for facilitating bending and standing of the reinforcing piece 10 and the uprighting auxiliary piece 11.
In addition, a half-cut line is provided at a required portion of each fold line.

On the other hand, the front wall surface 3 constituting the rear part 20B
5C is also provided with cut-and-raised cuts (or folds) K and cut-and-raised cuts for bending and erecting a pair of reinforcing pieces 15, 15 in the same manner as in the case of forming the front part 203A. In this cut-and-raise cut, the cut 36 plays its role. In addition, the upright reinforcing piece 1 that assists the uprighting of the reinforcing piece 15.
6 and 16 are formed on the top surface 35B in the same manner as above. Then, when the packing 203 is folded up,
As shown in FIG. 10, the fitting slits 17, 18, 19
Is provided.

Reference numeral 104 shown in FIG. 10 is for fixing the folded shape of the packing 203 bent in an L shape.
It is a strip-shaped fixing / reinforcing piece. Cardboard fixed
The reinforcing piece 104 is bent into an L-shape along a fold line T provided in the center in the longitudinal direction thereof, and then, as shown in FIG. 11, the front part 203A and the rear part 203B of the folded packing 203 are separated from each other. It is inserted into the gap c created between the two.
At that time, in order to avoid interference with the reinforcement pieces 6 and 6,
On both sides of the lower edge of the reinforcing piece 104, the fitting slits 37, 3 are provided.
7 is provided.

Next, the operation of the above configuration will be described. To fold up the packing 203 from one cardboard 103,
First, each one side portion of the front stage forming piece 33 and the rear stage forming piece 35, which are separated by the central cuts 34 and 36 on the left and right sides, are first folded up in a staircase shape. Then, the other side portion is folded up in a staircase shape. After that, if the back surface 35A is bent into an L shape along the central fold line S, the desired staircase shape shown in FIG. 11 is folded up.

Finally, the fixing / reinforcing piece 104, which is bent into an L shape, is inserted into the gap c between the front portion 301A and the rear portion 301B as shown in FIG. The fitting slit 37 of is engaged with the fitting slit 19 of the reinforcing piece 6, and the final folded shape of the packing 203 is firmly fixed. Thus, the corner packing 203 having a desired shape is completed. In this state, the front wall surface 35C of the rear part 203B is reinforced in a two-ply state, so that the packing 203 can further enhance the cushioning / protecting function of the packed article.

Another characteristic of the packing 203 of the third embodiment that is different from the packings 101 and 102 of the first and second embodiments is as follows. That is, in the case where the packaged article is provided with a laterally protruding portion in the form of, for example, a thin flange in the corner portion, and if the packing is 101 or 102, if the packing is applied to this corner portion, both upper and lower sides thereof are There is a problem in that the protrusion is fitted in the horizontally oriented gap formed between the steps. However, the packing 2 of this embodiment
If you use 03, such a problem does not occur. Further, the load bearing capacity of the top surface 33B of the front part 203A is enhanced by the back surface 33C.

FIG. 13 shows the corner packing 204 of the fourth embodiment. This packing 104 is
The packing 102, 103 of the third embodiment is constructed in a combination. The difference from the packing 103 is that the fixing / reinforcing piece 104 is omitted, and instead, in the packing 102, the engaging portion 21 and the engaged portion 22 that are provided as the folding-shaped fixing means. The front part 204A
It is formed on the front wall surface 33A.

In the above structure, the object of the present invention can be achieved even if the detailed structure is appropriately changed in design. For example,
The width, length, etc. of each part of the staircase may be appropriately changed according to the size, shape, weight, etc. of the packaged article, and the lengths of the left and right sides of the central folds A, S are not necessarily the same. do not have to. Further, the shapes of the engaging protrusion 12 and the engaging notch 14 are not limited to those shown in the drawings, and may be provided on the upper forming piece 4 side. The sheet material is not limited to cardboard.

[0040]

As is apparent from the above description, the folding corner packing according to the present invention exhibits various practical advantages as listed below, as compared with the conventional foam polystyrene packing. . (A) It is possible to prevent waste of valuable petroleum resources by using paper sheet materials such as corrugated cardboard. (B) Unlike styrofoam, there is almost no inconvenience in discarding used packing. (C) Since it can be stored and transported in the state of being developed on one sheet material, storage and transportation costs can be conspicuously reduced. (D) The folded shape of the packing can be fixed easily and securely by simply engaging the engaging portion and the engaged portion with each other or fitting the fixing / reinforcing piece. (E) Number of reinforcing pieces to be formed upright inside the packing,
Optimal cushioning characteristics can be easily obtained for each of various packaged articles by simply changing the shape, arrangement, and the like. (F) And, compared with the conventional packing made of laminated corrugated board, it can be made much easier and is not bulky in storage and transportation.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention and is a perspective view of a state in which it is developed on one sheet material.

FIG. 2 is a perspective view showing a state in which the packing is started to be folded up from the sheet material.

FIG. 3 is a perspective view showing a state in which the packing is substantially folded up.

FIG. 4 is a perspective view of the packing that has been folded up.

FIG. 5 is an explanatory diagram of a usage state of the packing.

FIG. 6 shows a second embodiment of the present invention and is a perspective view showing a state where the sheet material is developed on one sheet.

FIG. 7 is a perspective view showing a state in which the packing is started to be folded up from the sheet material.

FIG. 8 is a perspective view showing a state in which the packing is substantially folded up.

FIG. 9 is a perspective view of the packing that has been folded up.

FIG. 10 shows a third embodiment of the present invention and is a perspective view showing a state in which it is developed on one sheet material.

FIG. 11 is a perspective view showing a state where a fixing / reinforcing piece is being fitted into the folded packing.

FIG. 12 is a perspective view of the completed packing.

FIG. 13 is a perspective view of a packing according to a fourth embodiment of the present invention.

FIG. 14 is a perspective view showing a conventional example.

[Explanation of symbols]

 101, 102, 103 Corrugated cardboard (sheet material) 104 Fixing / reinforcing piece 201, 202, 203, 204 Corner packing 201A, 202A Lower part 201B, 202B Upper part 203A, 204A Front part 203B, 204B Rear part 1 Back piece 2 Lower part Forming piece 2A Bottom surface 2B Front wall surface 2C Upper surface 3 Cut 4 Upper stage forming piece 4A Top surface 4B Front wall surface 4C Lower surface 5 Cut 6,10,15 Reinforcing piece 7 Cut and cut break 8, 11, 16 Standing auxiliary piece 9 L-shaped cut 12 12 Collision piece (engagement part) 13 Cut 14 Notch for engagement (engaged part) 17, 18, 19 Fitting slit 21 Cut (engagement part) 22 Side end (engaged part) 23 Bending piece for reinforcement 31 bottom piece 32 central notch 33 front formation piece 33A front wall surface 33B top surface 33C back surface 34, 36 center cut 3 Rear stage forming piece 35A Rear surface 35B Top surface 35C Front wall surface 37 Fitting slit A Central fold BT T fold H, J, K Cut and fold fold (cut) I Oblique fold S, R Center fold a Notch hole b Step difference c Gap 300 Packing article 400 Cardboard box 500 Styrofoam packing 500a Recessed part

Claims (7)

[Claims] 1. A double-tiered staircase having a predetermined width can be obtained by simply bending one sheet material 101, 102 along a fold line.
The three-dimensional corner packings 201 and 202, which are bent horizontally into an L-shape, are configured to fold up, and the sheet materials 101 and 102 are central folds that are bent into the L-shape. A rectangular area provided with A is used as a back piece 1 which is a back portion of the stairs, and a lower edge of the back piece 1 is bent into a U-shaped cross section to form a lower step portion 201A of the stairs. The lower-stage forming pieces 2 are continuously provided via folds B in a state of being divided into left and right sides with the central fold A as a boundary, and the upper edge of the back piece 1 is bent in a U-shaped cross section to form the stairs. In order to fix the folded shape of the packing, the upper-stage forming pieces 4 for bending the upper-stage portion 201B are continuously provided through the folds C in a state of being divided into left and right sides with the central fold A as a boundary. On one of the left and right sides of the lower stage forming piece 2, The parts 12 and 21, on the other, folding the corner packing characterized in that it comprises a structure provided with the engaged portion 14, 22. 2. The engaging portion 12 and the engaged portion 14 are engaging protrusions and engaging notches provided on the left and right sides of the bottom surface 2A of the lower stage forming piece 2. Item 1
Folding corner packing described. 3. The engagement portion 21 and the engaged portion 22 are provided on one side of the left and right sides of the front wall surface 2B of the lower stage forming piece 2 to form a step portion b, and a cut portion 21 and this step portion. The foldable corner packing according to claim 1, wherein the foldable corner packing is the side end 22 on the other side locked to b. 4. A cut-and-raised fold H, on which a reinforcing piece 6 and a standing up auxiliary piece 8 for enhancing the structural strength of the lower portion and the upper portion are formed on the left and right sides of the back piece 1 in a cut-up shape, The foldable corner packing according to any one of claims 1 to 3, wherein the oblique fold I and the cut-and-raised cuts 7 and 9 are provided so as to extend over both upper and lower sides of the back piece 1, respectively. 5. The front wall surfaces 2B and 4B, which are the front surfaces of the lower portion and the upper portion, respectively, have reinforcing pieces 10 and 15 and an uprighting auxiliary piece 1 for enhancing the structural strength of the upper and lower step portions, respectively.
Cut-and-raised folds J, 1 and 16 are formed upright in a cut-and-raised shape,
The K and the cut-and-raised cuts 3 and 5 are provided so as to straddle the upper and lower sides of the front wall surfaces 2B and 4B, respectively.
A foldable corner packing according to any one of 4 to 4. 6. A packing 203 having a three-dimensional shape, such as a two-tiered staircase having a predetermined width bent horizontally in an L shape, is folded up by simply bending one sheet material 103 along a fold line. The sheet material 103 includes a central cutout 32, and a rectangular area bent in an L shape in the surface direction thereof is used as a bottom piece 31 to be the bottom of the stairs. At the front edge of the bottom piece 31, a front-stage forming piece 33 that is bent in a U-shaped cross section to form the front-stage portion 203A of the staircase is divided into left and right sides with a central cut 34 as a boundary. An upper step forming piece 35, which is continuously provided via M, is bent at the rear edge of the bottom surface piece 31 in a U-shaped cross section to bend and form the rear step portion 203B of the stairs. The fold line N is divided into left and right sides with 36 as the boundary. In order to fix the shape of the folded corner packing 203, a strip-shaped fixing / reinforcing piece 104 is attached, and the fixing / reinforcing piece 104 is folded into an L-shape. A foldable corner packing, characterized in that it is bent and inserted into a gap c formed between the front part 203A and the rear part 203B. 7. A fold H for cutting and raising, a fold H for cutting and raising, which forms a reinforcing piece 6 and its upstanding auxiliary piece 8 in a raised shape on the left and right sides of the bottom piece 31 for buffering the shape of the stairs. The fold I and the cut-and-raised cuts 7 and 9 are provided so as to straddle the front and rear sides of the bottom surface piece 31, respectively, and the front-stage forming piece 33 and the rear-stage forming piece 35 reinforce each step shape in a buffer manner. The pieces 10 and 15 and the stand-up auxiliary pieces 11 and 16 are formed to stand up in a cut and raised shape,
The foldable corner packing according to claim 6, wherein cut and raised folds J, K and cut and raised cuts 34, 36 are provided.