JP2013100125A - Lid for paper box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve mechanical strength while making it easy to fold a paper lid.SOLUTION: The leading ends of rectangular paper end walls 10 and 12 extend from the basal ends located at the facing edges 6 and 8 of a rectangular paper top panel 4. The leading ends of the side walls 30 and 32 extend from the basal ends of the long sides 26 and 28 of the top panel 4 and are connected with the end walls 10 and 12. The respective leading end sides of the end walls 10 and 12 and sidewalls 30 and 32 are folded inside along folding lines 22, 24, 46, and 48 respectively. Inner wall parts 18, 20, 38, and 40 are stuck to external wall parts 14, 16, 34, and 36 respectively. The end walls 10 and 12 are folded along inclined fold lines 50 and 52 such that the sidewalls 30 and 32 are laid on the top plate 4. In the internal wall parts 18 and 20 of the end walls 10 and 12, through-holes 54 and 56 penetrating to the external walls at the positions superposed on the inclined fold lines 50 and 52, are formed.

Description

  The present invention relates to a paper lid for a paper box, and more particularly to a foldable one.

  2. Description of the Related Art Conventionally, a paper box lid that can be folded is known for the convenience of transportation, storage, and disposal. An example thereof is disclosed in Patent Document 1. According to the technique of Patent Document 1, a pair of left and right side walls are connected to a pair of left and right sides of a paper-made rectangular top plate, and a pair of front and rear side walls are connected to a pair of front and back sides of the top plate. An inclined crease of approximately 45 degrees is provided on both the front and rear side surfaces of the pair of left and right side walls across the side opposite to the top plate of the left and right side walls and the top plate. Bend it to the side of the plate and put the front and back side walls on top. As a result, the lid is folded. In this folded state, the left and right side walls are raised to raise the front and rear side walls, and the cover can be used.

JP-A-9-142440

  According to the technique of Patent Document 1, it is possible to easily shift from the folded state to the unfolded state, and from the unfolded state to the folded state, and the workability is high. However, each of the left and right side walls and the front and rear side walls is composed of a single sheet of paper, so that the side walls are thin and the mechanical strength as a paper lid is small. In addition, the back side of the paper used as the material of the lid appears on the inner surface of the lid as it is, and usually the back side of the paper is not decorated at all, which is not aesthetically pleasing. Together, these paper lids are difficult to use as lids for paper boxes that house luxury items.

  The present invention is a paper box having a sufficient aesthetic appearance to accommodate a high-quality product while increasing the thickness of the side wall while maintaining high workability and increasing the mechanical strength as a lid. The object is to provide a lid.

  The lid of the paper box of one embodiment of the present invention has a rectangular paper top plate. As the shape of the top plate, a rectangular shape can be used, and a square shape can also be used. First to fourth rectangular side walls made of paper are connected to the top plate. The first and second side walls have base ends at the first and second edges of the top plate facing each other, the tips extend from the base ends in the opposite direction to the top plate, and face each other. The third and fourth side walls have base ends at the third and fourth edges orthogonal to the first and second edges of the top plate, and tips extend from the base end in the opposite direction to the top plate, and Opposite. The third and fourth side walls are continuous with the first and second side walls. The first to fourth side walls are folded inward on the distal end side along folding lines on the way from the proximal end to the distal end. Furthermore, the inner wall part between the said front end side and the said folding line is stuck on the outer wall part between the said base end side and the said folding line. As a result, the folding line becomes the leading edge of the lid. The inner wall portion and the outer wall portion of the first and second side walls are along an inclined fold line toward the third and fourth edges of the top plate from a position on the center side of the fold line serving as a boundary between them. Thus, the third and fourth side walls are bent so as to overlap the top plate. As a result, the box is folded. On the inner wall portions of the first and second side walls, a mechanical fragile portion having a mechanical strength lower than that of the inclined folding line is formed at a position overlapping the inclined bending line.

  In the paper lid configured as described above, the first to fourth side walls have a double structure including an inner wall portion and an outer wall portion by being folded along a folding line. As a result, the thickness increases and the mechanical strength also increases. Further, when the inner surface of the lid is viewed, the outer surface of the paper that is the material of the lid can be seen as the inner wall portions of the side walls and the end walls. In general, the outer surface of the paper used as the material for the lid is aesthetically decorated, and the portion where the makeup is applied is seen as an inner wall portion, thus creating a sense of quality. However, the increase in mechanical strength makes it difficult to fold along the inclined fold line and may cause damage along the inclined fold line due to the force applied during bending. In view of this, a mechanical fragile portion having a weaker mechanical strength than the inclined fold line is formed on the inner wall portion so as to overlap the inclined fold line, thereby releasing the applied force and facilitating bending and preventing damage. Since the mechanical fragile portion is provided on the inner wall portion, there is no problem even if it is used as a lid of a box for accommodating a high-quality product without impairing the aesthetic appearance.

  Examples of the mechanically fragile portion include a through-hole penetrating the inner wall portions of the first and second side walls, an inclined fold line wider than the inclined fold line, and substantially the same width as the inclined fold line. A plurality of inclined fold lines can be formed close to each other. When a plurality of wide inclined fold lines or a plurality of inclined fold lines are provided close to each other, since no hole is provided in the inner wall portion, the aesthetics are improved as compared with the case where a through hole is provided.

  In addition, when a through-hole is provided as a mechanical weak part, the front-end | tip of the said inner wall part of a 1st and 2nd side wall can be located in the middle of the said outer wall part. In this case, the through hole is formed from the folding line to the vicinity of the tip of the inner wall portion.

  If the tip of the inner wall is extended to the vicinity of the top plate, the mechanical strength becomes considerably strong and it becomes difficult to bend. Therefore, the inner wall portions of the first and second side walls are easily bent up to the middle of the outer wall portion. Furthermore, the through hole is formed from the folding line of the inner wall portion to the tip portion so as not to be interrupted in the middle of the inner wall portion.

  As described above, in the paper lid according to the present invention, the thickness of the side wall is increased, the mechanical strength is increased, and the inner wall portion serving as the inner surface of the lid is easily folded to maintain high workability. .

It is an expanded view of the lid | cover of the 1st Embodiment of this invention. FIG. 2 is an enlarged vertical sectional view of a part of the developed view of FIG. 1. It is a top view of the state which bent the inner wall part of the end wall from the state of FIG. It is a top view of the state which bent the inner wall part of the side wall from the state of FIG. It is a top view of the state which raised the outer wall part of the end wall and the side wall from the state of FIG. It is a longitudinal cross-sectional view of the state of FIG. It is a top view of the state folded by bend | folding an end wall and a side wall from the state of FIG. It is an expanded view of the lid | cover of the 2nd Embodiment of this invention. FIG. 9 is an enlarged vertical sectional view of a part of the development view of FIG. 8. It is a partial omission development view of the lid of a 3rd embodiment of the present invention. FIG. 11 is an enlarged vertical sectional view of a part of the development view of FIG. 10.

  The paper lid of the first embodiment of the present invention is an assembly of cut sheets 2 obtained by cutting paper, for example, cardboard, as shown in FIG. FIG. 1 shows the inner surface of the cutting sheet 2, and although not shown, a decorative material such as Japanese paper, decorative paper, and decorative cloth is attached to the outer surface. The cutting sheet 2 has a rectangular top plate 4 arranged at the center thereof in a rectangular shape, for example, a vertically long shape.

  First and second side walls, for example, end walls 10 and 12 are formed so as to be connected to the first and second edges of the top plate 4, for example, the short sides 6 and 8. The end walls 10 and 12 have outer wall portions 14 and 16 and inner wall portions 18 and 20, and the outer wall portions 14 and 16 are rectangular, for example, a rectangular shape arranged in a horizontally long state, and one of the long sides thereof is , Common with the short sides 6 and 8 of the top plate 4. As shown in FIG. 2, these short sides 6 and 8 are pressed from the outer surface side, the outer surface side of the cutting sheet 2 is depressed, the inner surface side protrudes, and the thickness is thinner than other portions of the cutting sheet 2, It is easy to bend. The other long side is continuous with the inner wall portions 18 and 20. These other long sides are the folding lines 22 and 24 that fold the inner wall portions 18 and 20 with respect to the outer wall portions 14 and 16. The folding lines 22 and 24 are also formed in the same manner as the short sides 6 and 8 and are easily bent. The inner wall portions 18 and 20 have rectangular protrusions protruding outward at the center of the upper base of the isosceles trapezoidal shape with the folding lines 22 and 24 as the lower base and inclined at 45 degrees from both ends. Is formed shorter than the short side dimension of the outer wall portions 14 and 16.

  Third and fourth side walls, for example, side walls 30 and 32 are formed so as to continue to third and fourth edges, for example, long sides 26 and 28, which are orthogonal to the first and second edges of the top plate 4. . These long sides 26 and 28 are also configured in the same manner as the short sides 6 and 8, and are easily bent. The side walls 30, 32 also have outer wall portions 34, 36 and inner wall portions 38, 40, and also have connecting pieces 42a, 42b, 44a, 44b. The outer wall portions 34 and 36 are formed in a rectangular shape arranged vertically, and one of the long sides is common to the long sides 26 and 28 of the top plate 4. The other long side is continuous with the inner wall portions 38, 40, and the other long side is a folding line 46, 48 that folds the inner wall portions 38, 40 with respect to the outer wall portions 34, 36. These fold lines 46 and 48 are also formed in the same manner as the short sides 6 and 8 and are easily bent. The short side dimension of the outer wall portions 34 and 36 is substantially equal to the short side dimension of the outer wall portions 14 and 16. The inner wall portions 38, 40 have protrusions protruding outward at the center of the upper base of a short isosceles trapezoid having a hypotenuse of 45 degrees with the folding lines 46, 48 as the bottom, and a hypotenuse of 45 degrees. The dimension of is substantially equal to the dimension of the short side of the outer wall portions 34 and 36.

  The connecting pieces 42a, 42b, 44a, 44b are connected to the short sides of the outer wall portions 34, 36, have rectangular portions on the long sides 26, 28 side of the top plate 4, and two on the folding lines 46, 48 side. It has an equilateral right triangle, and the short side dimension of the rectangular part is somewhat shorter than the short side dimension of the outer wall parts 14 and 16, and the height of the isosceles right triangle part is equal to that of the rectangular part. It is even shorter than the short side dimension. The length dimension of the long sides of the connecting pieces 42a, 42b, 44a, 44b is an isosceles trapezoidal shape from the short sides 6, 8 of the top plate 4 to the outer walls 14, 16 of the end walls 10, 12 to the inner walls 18, 20. The bottom and height of the isosceles right triangles of the connecting pieces 42a, 42b, 44a, 44b are formed slightly shorter than the distance to the upper base, and the lengths of the inner walls 18, 20 of the end walls 10, 12 are the same. It is about 1/2 of the difference between the length of the upper and lower bases of the isosceles trapezoid. Similarly to the short sides 6 and 8, the short sides of the outer wall portions 34 and 36, which are the boundaries between the connecting pieces 42a, 42b, 44a and 44b and the outer wall portions 34 and 36 of the side walls 30 and 32, are formed so as to be easily bent.

  On the outer walls 14 and 16, inclined folding lines 50, 50, 52 and 52 of about 45 degrees from both ends of the short side of the top plate 4 toward the folding lines 22 and 24 are formed. These inclined fold lines 50, 50, 52, 52 are also formed in the same manner as the short sides 6, 8, and are easily bent. In addition, mechanically fragile portions, for example, through holes 54, 54, 56, 56 penetrate the inner wall portions 18, 20 on the inclined fold lines 50, 50, 52, 52, with the fold lines 22, 24 as symmetry axes. The inner wall portions 18 and 20 are formed as described above. Since it penetrates, the part in which the through holes 54, 54, 56, 56 are formed has lower mechanical strength than the part in which the folding lines 50, 50, 52, 54, 54 are formed, and it is easy to bend. It has become. These through holes 54, 54, 56, 56 reach the vicinity of the tips of the protruding portions of the inner wall portions 18, 20 from the folding lines 22, 24.

  The assembly of the lid is performed as follows. From the state shown in FIG. 1, the inner walls 18 and 20 are folded along the folding lines 22 and 24 so as to contact the inner surfaces of the outer walls 14 and 16 as shown in FIG. To wear. From the state shown in FIG. 2, the inner wall portions 38, 40 are bent along the folding lines 46, 48 as shown in FIG. 4 so as to be in contact with the inner surfaces of the outer wall portions 34, 38, and both are bonded with an appropriate adhesive. To do.

  From the state shown in FIG. 4, the outer wall portions 14 and 16 of the end walls 10 and 12 are bent along the short sides 6 and 8 of the top plate 4 so that the outer walls 14 and 16 are substantially perpendicular to the top plate 4. Wake up. Similarly, the outer wall portions 34 and 36 of the side walls 30 and 32 are bent along the long sides 26 and 28 of the top plate 4 so that the outer walls 34 and 36 are substantially perpendicular to the top plate 4. This state is shown in FIG. Then, the connecting pieces 42a, 42b, 44a, 44b are bent along the short sides of the outer wall portions 34, 36 so as to be substantially perpendicular to the outer wall portions 34, 36, and the outer wall portions 34, It is raised to be approximately perpendicular to 36. At this time, as shown in FIG. 5, the connecting pieces 42 a, 42 b, 44 a, 44 b are formed on the non-contact portions of the inner wall portions 18, 20 on the side walls 30, 32 side of the inner surfaces of the outer wall portions 14, 16 of the end walls 10, 12. Located and affixed to the inner surfaces of the outer wall portions 14, 16 of the end walls 10, 12 by a suitable adhesive. However, the entire surface is not adhered, but only the upper part of the part where the inclined folding lines 50, 52, 52 and the connecting pieces 42a, 42b, 44a, 44b overlap is adhered. Thereby, the end walls 10 and 12 and the side walls 30 and 32 are connected.

  Since the lid is constructed as described above, the end walls 10 and 12 and the side walls 30 and 32 both have a double structure, the thickness of the end walls 10 and 12 and the side walls 30 and 32 is increased, and the mechanical strength is increased. Has been increased. Moreover, since the opening peripheral edge of the lid, in FIG. 6, the upper surface opening is constituted by the folding lines 22, 24, 46, and 48, the cross section of the paper does not appear, and particularly in the cutting sheet 2, the end wall Folding lines 22 on the outer surfaces of the outer walls 14, 16, 34, 36 of the outer walls 10, 12, 34, 36 and the outer surfaces of the inner walls 18, 20, 38, 40 of the end walls 10, 12, 32, 32, Since the decorative material is provided as described above up to a position slightly inside of 24 and 46, the portions of the folding lines 22, 24, 46, and 48 in the decorative material portion can be seen as the opening peripheral portion of the lid. Furthermore, the portion of the decorative material on the outer surface of the inner walls 38 and 40 of the inner walls 18 and 20 of the end walls 10 and 12 and the side walls 30 and 32 appears on the inner surface side of the lid. Together these make a high-class lid.

  The outer wall located inside the inclined fold lines 50, 50, 52, 54 along the inclined fold lines 50, 50, 52, 54 formed on the outer walls 14, 16 of the end walls 10, 12 in a state completed as a lid. End walls where the portions 14 and 16 and the inner wall portions 18 and 20 overlap the top plate 4 and the portions outside the inclined folding lines 50, 50, 52 and 54 overlap the top plate 4 The outer wall portions 14 and 16 of the 10 and 12 are bent so as to overlap the outer surfaces. As a result, as shown in FIG. 7, the side walls 30 and 32 move so as to overlap the end walls 10 and 12 that overlap the top plate 2, and the lid is in a completely folded state.

  As described above, since the end walls 10 and 12 have a double structure of the outer wall portions 14 and 16 and the inner wall portions 18 and 20 and the mechanical strength is increased, along the inclined folding lines 50, 50, 52 and 52. A large force is required to bend, and if it is bent with a large force, the inner wall portions 18, 20 and the folding lines 22, 24 are likely to be damaged. Therefore, through holes 54, 54, 56, and 56 are formed in the inner wall portions 18 and 20 in order to reduce the force applied to the inner wall portions 18 and 20 to facilitate bending and to prevent breakage. The through holes 54, 54, 56, 56 can be formed only in a part of the inner wall portions 18, 20 as long as they follow the bending inclination lines 50, 50, 52, 52. Then, it is formed from the folding lines 22 and 24 in the inner wall portions 18 and 20 of the end walls 10 and 12 to the tips of the inner wall portions 18 and 20, and the force applied to the inner wall portions 18 and 20 is sufficiently reduced.

  Further, the inner wall portions 18 and 20 can be configured to overlap the entire area of the outer wall portions 14 and 16, but in this case, the force required for bending is further increased. Therefore, the inner wall portions 18 and 20 are configured so as to partially overlap the outer wall portions 14 and 16 from the folding lines 22 and 24 of the outer wall portions 14 and 16, thereby reducing the force required for bending.

  A development view of the lid of the paper box of the second embodiment is shown in FIG. The lid of this embodiment is the most different from the lid of the first embodiment. In the first embodiment, the through holes 54, 54, 56, and 56 are provided, but the enlarged view is shown in FIG. As shown, wide inclined folding lines 540, 540, 560, and 560 are provided. That is, the inclined folding lines 540, 540, 560, and 560 are formed wider than the inclined bending lines 50, 50, 52, and 54. For this reason, the mechanical strength is set to be weaker than that of the inclined folding lines 50, 50, 52, 52, as in the case where the through holes 54, 54, 56, 56 are provided. Therefore, it functions similarly to the case where the through holes 54, 54, 56, 56 are provided.

  In the paper lid of the second embodiment, the inner wall portions 180 and 200 of the end walls 10 and 12 are formed in an isosceles trapezoidal shape, and the connecting pieces 420a, 420b, 440a, and 440b are one leg and the lower bottom. Are formed in a trapezoidal shape with 90 degrees, and the inner wall portions 380 and 400 of the side walls 30 and 32 are formed in a shape in which a rectangular protrusion is provided on the upper base of the isosceles trapezoid. Since others are configured in the same manner as in the first embodiment, detailed description thereof is omitted.

  FIG. 10 shows a partially omitted development view of the lid of the paper box of the third embodiment. In this embodiment, instead of the wide inclined fold lines 540, 540, 560, 560, a plurality of, for example, 2 having the same width as the inclined fold lines 50, 50, 52, 54 as shown in FIG. Through three inclined fold lines 541, 541, 541... 561, 561, 561. Others are configured similarly to the second embodiment.

  In each of the above embodiments, the top plate 4 is rectangular, but the top plate 4 is not limited to this. For example, a square top plate can be used. In each of the above embodiments, the inner wall portions 38 and 40 of the side walls 30 and 32 are configured to completely overlap the outer wall portions 34 and 36, but similarly to the inner wall portions 18 and 20 of the end walls 10 and 12. Further, it is possible to configure such that a part thereof overlaps with the outer wall portions 34 and 36. In each of the above embodiments, the short sides 6 and 8, the fold lines 26, 28, 46, and 48, the inclined fold lines 50 and 52, the inclined fold lines 541 and 561, and the like have a shape in which the outer surface side is recessed and the inner surface side protrudes. However, conversely, the inner surface side can be recessed and the outer surface side can be projected, or the so-called perforation can be used as a fold line or an inclined fold line.

4 Top plate 6 8 Short side (1st and 2nd edge)
10, 12 End walls (first and second side walls)
14 16 outer wall part (outer wall part of the first and second side walls)
18, 20 Inner wall (the inner wall of the first and second side walls)
22, 24, 46 48 Folding line 26 28 Long side (third and fourth edges)
30 32 side walls (third and fourth side walls)
34 36 Outer wall portion (outer wall portion of third and fourth side walls)
38 40 Inner wall (the inner wall of the third and fourth side walls)
50 52 Inclined fold line 54 56 Through hole (mechanically weakened part)
540 560 Wide inclined fold line (mechanically fragile part)
541 561 Adjacent inclined fold line (mechanical weak part))

Claims (5)

A rectangular paper top,
First and second side walls made of paper and rectangular opposite to each other, extending from the base ends at the first and second edges of the top plate facing each other in the opposite direction to the top plate,
A distal end extends in a direction opposite to the top plate from a base end at a third and fourth edge orthogonal to the first and second edges of the top plate, and is opposed to each other, and the first and second side walls The third and fourth side walls made of continuous paper and rectangular,
In the paper lid with
The first to fourth side walls are each folded back inward along the folding line in the middle from the base end toward the distal end, and further, an inner wall portion between the distal end side and the folding line is formed. Affixed to the outer wall between the base end side and the folding line;
The inner wall portion and the outer wall portion of the first and second side walls are inclined from the center side of the fold line at the respective boundary positions toward the third and fourth edges of the top plate. And the third and fourth side walls are folded so as to overlap the top plate,
The inner wall portion of the first and second side walls is formed of a paper box in which a mechanical strength weakened portion having a lower mechanical strength than the inclined folding line is formed at a position overlapping the inclined folding line. lid.   The paper box lid according to claim 1, wherein the mechanically weakened portion is a through-hole penetrating the inner wall portions of the first and second side walls.   3. The paper box lid according to claim 2, wherein tips of the inner wall portions of the first and second side walls are located in the middle of the outer wall portion, and the through hole is near the tip of the inner wall portion from the folding line. A paper box lid that is formed up to.   The paper box lid according to claim 1, wherein the mechanically fragile portion is an inclined folding line wider than the inclined folding line.   2. The paper box lid according to claim 1, wherein the mechanically weakened portion is formed by adjoining a plurality of inclined folding lines having substantially the same width as the inclined folding line. .

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