JP2017077321A - Lunch box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lunch box that can be transported in a reduced space to curtail a transport cost and that causes no collapse of the lid of a lunch box on a lower stage side even when lunch boxes filled with food are vertically placed on top of one another.SOLUTION: A lunch box has a lid part 13 that openably/closably cover the opening part of a lunch box body 11. Side parts 15 of the lunch box body have an inclination angle that makes the area of the opening part larger than the area of the bottom face part. The lid part is formed with a single sheet of thick paper, bent continuously with the lid part body 16 via a bent line part, and provided with a side cover part 18 having a width that can cover roughly the whole area in the height direction of the side part of the lunch box body 11. The bent line part is formed by a groove part which is prepared between the lid body part and the side cover part on the reverse face side of the lid part 13. When the lid part is put on the lunch box body, the lid part is fastened to the lunch box by winding a rubber band 23 around the lid part and the lunch box.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lunch box, and more particularly, to a lunch box that is made of paper and has a possibility that the lowermost lunch box is not collapsed even when a large number of food boxes are stacked and stacked.

  In general, cardboard lunch boxes are widely used. Many of these lunch boxes have a main body formed in a thin rectangular parallelepiped box shape with an open top, and a lid that can cover the opening of the main body. An opening is covered with a part, and a lid part and a main-body part are tied and fixed with a rubber band etc. and sold.

  When such a conventional lunch box is stacked in the height direction with food packed in a lunch box in which each lunch box has the same dimensions, the bottom portion of the lower lunch box Since each side part of the lunch box placed on the upper stage is placed on each side part that is erected so as to be orthogonal to the peripheral part of the lunch box, the lower lunch box has the upper food items. Because it can support the weight of the packed lunch box, the lower lunch box will not collapse due to the weight of the upper lunch box, and the lunch boxes will be stacked and displayed for transportation or sales. be able to.

  However, in such a conventional lunch box in which the lunch box body is formed in a thin rectangular parallelepiped, when the lunch box manufacturer is transported to the person skilled in the art for delivery, many lunch box bodies are used. When stacked, the side parts of the upper lunch box are stacked on the side parts of the lower lunch box, so the height of the side part depends on the number of stacked lunch boxes. Space is required in the vertical direction.

As a result, there is a problem in that a lot of transport space is required when transporting the lunch box, increasing the transport cost.
Therefore, in order to solve such a problem, the applicant of the present patent application has a side surface portion of the lunch box body having an inclination angle in which the area of the opening is larger than the area of the bottom surface portion, A lunch box formed in a tapered shape that expands upward is proposed (Patent Document 1).

  In such a lunch box, when the lunch box body is stacked along the height direction when the lunch box is transported, the side part is formed in a tapered shape that expands upward. Since the upper lunch box body is housed in the lower lunch box body, the space in the height direction for transportation can be greatly reduced, and the cost required for transportation can be greatly reduced. .

However, in the lunch box formed in a tapered shape in which the side portion expands upward, the lunch box is delivered to the lunch box body and the food is packed in the lunch box body and the lid portion is covered. When stacked in the vertical direction, the side of the upper lunch box does not contact the side of the lower lunch box, and the weight of the upper lunch box is the lid of the lower lunch box. It will take.
In this case, in the conventional lid portion, the side surface covering portion of the lid portion is formed only in a width dimension that covers only the upper end portion of the side surface portion of the lunch box body, and the entire upper lunch box is formed. Since the weight acts on the upper surface of the lid of the lower lunch box, the upper surface of the paper lid cannot support the weight of the upper lunch box including food, and the lower lunch box lid. There is a problem that the portion is crushed by the weight of the upper lunch box and cannot be provided as a product.

From this point of view, the applicant of the present patent investigated past patent documents and extracted the following patent documents 2 to 4.
Registered Utility Model No. 3152922 Utility Model Registration No. 3151130 JP-A-8-72854 JP-A-8-318933

  However, in any technique described in any document, the problems are different and it is impossible to solve the above problems.

  The present invention is for solving such a conventional problem, and the problem is that it is possible to reduce the conveyance space and the conveyance cost, and to stack the food in the up and down direction. An object of the present invention is to provide a lunch box that does not collapse the lid portion of the lower lunch box even if it is placed.

  In order to achieve the above-mentioned object, the invention according to claim 1 is made of a whole paper, and includes a lunch box body for storing food, and a lid portion for covering the opening of the lunch box body so as to be opened and closed. And the lunch box body has a side wall having an inclination angle in which the area of the opening is larger than the area of the bottom surface, and the lid is made of a single cardboard A lid body that is formed and can cover the opening of the lunch box body; and the lid body is bent by being connected to the lid body via a folding line, and the height direction of the side surface of the lunch box body A side surface covering portion having a width dimension capable of covering substantially the entire area of the fold, the folding line portion is formed by a groove provided between the lid body and the side surface covering portion on the back surface side of the lid portion, When the lid is attached to the lunch box body, a rubber band is hung around the lid and the lunch box. Characterized by fixing the lid to the lunchbox by.

  Therefore, in the first aspect of the present invention, the side surface covering portion is formed by being bent along a folding line portion formed by a groove portion provided on the back surface side of the lid portion, and the bento body portion is When the lid portion is covered and the side surface covering portion is folded back via the folding line portion, the side surface covering portion covers substantially the entire height direction of the side surface portion of the lunch box body.

  The invention according to claim 2 is characterized in that the bent portion is provided over the entire area between the lid main body and the side surface covering portion on the back side of the lid. In the invention according to claim 2, the side surface covering portion can be bent through the groove portion.

  The invention according to claim 3 is characterized in that the side surface covering portion has a width dimension slightly smaller than the width dimension of the side surface portion of the lunch box body.

  Therefore, in the invention described in claim 3, when the lunch box body is covered with the lid portion, the side surface covering portion covers the entire side surface portion of the lunch box body almost completely.

  In the invention according to claim 4, the lunch box body is formed in an overall reverse-prefixed quadrangular pyramid shape, while the lid body is formed in a square shape and the side surface covering portion is the lid body. It is characterized by being connected to each side of each.

  The invention according to claim 5 is characterized in that a resin film is adhered to the lid portion.

In the invention according to claim 6, the side surface portion of the lunch box body is erected at an angle of 80 degrees with respect to the bottom surface portion of the lunch box body, and the angle of the groove portion is formed at 100 degrees. The side surface covering portion of the lid portion is folded at an angle of 100 degrees with respect to the lid portion main body.
In the invention according to claim 7, the groove portion has a substantially V-shaped cross section and is formed over substantially the entire region in the thickness direction of the lid body, and is formed between the lid body and the side surface covering portion. It is characterized in that the gap is joined by a portion having a small thickness.

Conventionally, when food is packed in the lunch box main body and stacked in the height direction, the side surface covering portion of the lid portion is formed only to a size that covers only the upper end portion of the side surface portion of the lunch box main body. The upper part of the paper lid cannot support the weight of the upper lunch box including the packed food, and the lower lunch box lid is packed with food on the upper side. There was a situation where the lunch box was crushed by the weight and could not be provided as a product.
However, in the inventions according to claims 1 to 6, the side surface covering portion of the lid portion is bent to have a large width dimension capable of covering most of the side surface portion of the lunch box body, and the side surface covering is formed. When the part is bent over the entire side part of the lunch box body, the lid part body part is pulled in the direction of the side surface covering part through the folding line part formed by the groove part formed on the back side part, The tension acting in the opposite direction to the surface part of the lid part body acts in a crossing manner, and as a result, the rigidity of the lid part body increases, so that other lunch boxes filled with food are stacked on top. Even in this case, the lid body of the lower lunch box can support the weight of the upper lunch box.

As a result, it is possible to prevent the lid portion of the lower lunch box from being dented or collapsed due to the load on the upper lunch box, and to display multiple lunch boxes stacked in the height direction while packed with food. In addition, the lunch box can be transported in a state where a plurality of stages are stacked in the height direction.
In addition, the lid portion of the lunch box according to the present invention is formed by folding a piece of cardboard, and when transported for delivery to a person skilled in the art from a lunch box manufacturer, the developed cardboard is overlapped. Since it only has to be transported, it is possible to reduce the transport space when transporting a three-dimensionally assembled lid as in the prior art, and to reduce the transport cost.

  In addition, when the lid portion is assembled three-dimensionally on the delivered valve side by those skilled in the art, since the folding line portion formed by the groove portion is formed, it becomes possible to easily form the side surface covering portion. It is possible to easily and quickly perform the lunch box manufacturing operation.

In addition, since a fold-curved portion comprising a groove is provided on the back side of the lid body, when the side surface covering portion is bent, the lunch box body is covered by the lid body, If the lid is fixed to the lunch box body with rubber bands, the other lunch box is placed above and the load of the other lunch box Even if it is applied, the situation of folding back due to the rigidity of the paper can be prevented, and the lunch box body can be reliably covered with the lid.
The situation of this "folding back" is that the side surface covering portion is caused by the depression or distortion of the lid body due to the input of the load on the upper side lunch box that is input in the thickness direction of the lid body on the surface side of the lid body. Occurs when pulled laterally outward. However, in the inventions according to claims 1 to 6, by the folding line portion formed by the groove portion, the input of the force of the load acting on the surface side of the lid body is largely blocked by the groove portion, and the side surface covering portion Is not communicated to. As a result, it is possible to effectively prevent the side surface covering portion from expanding outward.
Further, in the invention according to claim 2, since the folding line portion is provided over the entire region between the lid body and the side surface covering portion on the back surface side of the lid portion, Can easily and quickly create the lid by folding the side surface covering portion.

  The invention according to claim 4 is configured such that the side surface covering portions are individually bent and brought into contact with the four side surface portions of the lunch box main body formed in the shape of an overall inverted prefix quadrangular pyramid. Since the lid main body is pulled opposite to each other in the plane direction by the four side surface covering portions, the tension acting on the lid main body becomes larger, and the load of the other lunch box loaded above Can be fully supported.

  In the invention according to claim 5, since the resin film is adhered to the lid portion, in addition to the effect up to the previous item, it is possible to further increase the rigidity of the lid portion, and it is more stable. Multiple lunch boxes can be stacked in the height direction.

  In the invention according to claim 6, since the side surface portion of the lunch box body is erected at an angle of 80 degrees with respect to the bottom surface portion of the lunch box body, the lunch box body is moved upward most efficiently. Therefore, it is possible to reduce the transportation cost of the lunch box.

  Further, the angle of the groove portion is formed at 100 degrees, and the side surface covering portion of the lid portion is folded back at an angle of 100 degrees with respect to the lid portion main body. Firmly adheres to the side of the lunch box body. As a result, the tension acting on the lid main body becomes larger, and it is possible to sufficiently support the load of the other lunch box loaded upward.

  In the invention according to claim 7, the groove portion has a substantially V-shaped cross section and is formed over substantially the entire region in the thickness direction of the lid body, and is formed between the lid body and the side surface covering portion. In addition to the effects of the inventions according to claims 1 to 6, the load acting in the thickness direction of the lid body is almost equal to the groove portion. Since it is completely cut off and transmission to the side surface covering portion is greatly suppressed, the situation of the side surface covering portion spreading outward is further reliably prevented.

It is a perspective view which shows one Embodiment of the lunch box concerning this invention. It is a perspective view showing an embodiment of a lunch box body according to the present invention, It is a perspective view which shows one Embodiment of the cover part which concerns on this invention. It is a plane development view showing one embodiment of a lid concerning the present invention.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
As shown in FIGS. 1 and 2, the lunch box 10 according to the present embodiment is made entirely of cardboard, and can open and close the lunch box body 11 for storing food and the opening 12 of the lunch box body 11. And a lid 13 that covers the cover.

As shown in FIG. 2, in the present embodiment, the lunch box body 11 is formed of thick paper having a thickness of 1 mm, is generally thin box-shaped, is formed in a substantially inverted-prefixed triangular frustum shape, and has a square shape. The bottom surface portion 14 and four substantially inverted trapezoidal side surface portions 15 erected on the four sides of the bottom surface portion 14.
The opening 12 formed in the upper part of the lunch box body 11 is formed in a square shape like the bottom part 14, and the side part 15 of the lunch box body 11 has an area of the opening 12 larger than the area of the bottom part 14. In this embodiment, it is formed so as to rise from the four sides of the bottom surface part 14 at an angle of 80 degrees.

  In the present embodiment, the short side portion L1 of the side surface portion 15 of the lunch box body 11 is 18 cm, the long side portion L2 is 19.6 cm, and the height dimension H is 5 cm.

  As shown in FIGS. 2 and 3, in the present embodiment, the lid portion 13 is formed of a single cardboard, and the lid portion main body 16 that can cover the opening 12 of the lunch box body 11; A width dimension (in the present embodiment, it can be bent by connecting to the lid main body 16 through a folding line portion 17 so as to cover substantially the entire height direction of the side surface portion 15 of the lunch box main body 11. 4.9 cm) and the side surface covering portion 18.

The lid body 16 is formed in a square shape having a size slightly larger than the area of the opening 12 of the lunch box body 11 (19.9 cm in the present embodiment), and the lid 13 covers the lunch box body 11. In some cases, the opening 12 is formed so as to be closed from above.
The reason why the width dimension (19.9 cm) of the lid main body 16 is formed larger than the width dimension (19.6 cm) of the opening of the lunch box main body 11 is that the side surface parts 15 are arranged so as to face each other. , 15 is 1 mm × 2 and the “play” when the lid portion 13 is attached to and detached from the opening portion 12 of the lunch box body 11 is taken into consideration.

  As shown in FIG. 3 and FIG. 4, the side surface covering portions 18 are connected to the lid portion main body 16 at each folding line portion 17 of the lid portion main body 16, and are provided as a whole in four pieces. 11 side surfaces 15 can be covered. In the present embodiment, the side surface covering portion 18 has a substantially rectangular main body portion 19 and a pair of arcuate contour portions 20 that extend from both end portions of the main body portion 19 and narrow toward both ends. , 20.

As shown in FIG. 4, in the present embodiment, four folding line portions 17 including groove portions 22 are formed between the four sides of the lid portion main body 16 and the side surface covering portion 18. As shown in FIG. 5, the groove portion 22 is provided between the lid portion main body 16 and the side surface covering portion 18 on the back surface side of the lid portion 13. The groove portion 22 has a substantially V-shaped cross section and is formed over almost the entire region in the thickness direction of the lid body 16, and a small remaining thickness dimension between the lid body 16 and the side surface covering portion 18. The groove portions 22 joined by these parts are formed over the entire four sides between the side surface covering portions 18 respectively connected to the four sides of the flat square lid body 16 as shown in FIG. In the present embodiment, the bending angle θ in the cross section is formed to be 100 degrees.

Hereinafter, the operation of the lunch box according to the present embodiment will be described.
When using the lunch box 10 according to the present embodiment, various foods are packed in the lunch box body 11, and then the lid 13 is covered so as to close the opening 12 of the lunch box body 11. In this case, each of the four side surface covering portions 18 is folded back in the back surface direction along the groove portion 22 formed in the folding line portion 17 and is erected with respect to the lid body 16.

  In the present embodiment, as described above, the opening angle θ in the cross section of the groove portion 22 of the lid body 16 is formed at 100 degrees, so that the side surface covering portion 18 is completely crushed. When folded in this way, the lid body 16 is raised and folded at an angle of 80 degrees with respect to the planar direction of the lid body 16.

  Therefore, in the present embodiment, when the side surface covering portion 18 is folded back with respect to the lid portion main body 16 as shown in FIG. Stands at an angle.

As a result, as shown in FIG. 1, when the lid 13 is placed on the lunch box body 11,
The four side surface covering portions 18 are in close contact with the side surface portion 15 formed at 80 degrees. Then, a rubber band 23 is hung on a pair of opposite corners of the lunch box 10 from above, and the lid 13 is fixed to the lunch box body 11.

  In the present embodiment, since the side surface covering portion 18 is formed to have a width dimension of 4.9 cm, substantially the entire area in the height direction of the side surface portion 15 having a height dimension of 5 cm of the lunch box body 11. The side cover 18 having a very large size is bent at an angle of about 100 degrees with respect to the lid main body 16, so that the side cover 18 is slightly formed only at the upper end as in the conventional lunch box main body. Unlike the case of the cover portion that is folded back and covered, the four side surface covering portions 18 are folded back so that the tension toward the outside of the cover body acts on the cover body 16 in opposition to each other. As a result, the stress in the plane direction of the lid body 16 increases.

  Accordingly, when a large number of lunch boxes 10 filled with food are stacked, the load on the upper lunch box 10 is applied to the lower lunch box 10 and is applied to the lid body 16 of the lowermost lunch box 10. Even when the full load is applied, the lid main body 16 of the lowermost lunch box 10 can support the load and does not result in deformation, breakage, or the like.

  In the experiment by the present applicant, the lunch box 10 according to the present embodiment is used, and the lid portion 13 made using virgin pulp paper having a thickness of 1 mm is covered with the lunch box main body 11 to have a width of 2 mm and a diameter dimension. A 7 cm general rubber band 23 was hung and fixed between the corners 21 and 21 facing each other, and a 4 kg heavy object was placed on the upper surface of the lid 13 and left overnight. As a result, the lid body 16 was not distorted or damaged.

The reason for placing a 4kg heavy item is that, in the lunch box sales industry, usually, seven lunch boxes filled with food are stacked on top of a lunch box packed with a single food for sale. There is a request to exhibit. In this case, the weight when food is packed in the lunch box of the size according to the present embodiment is set to approximately 500 g.
Therefore, in order to clear the above request, it is necessary to endure a load of 500 g × 7 = 3500 g. In this experiment, the situation was judged by applying a load of 4000 g (4 kg) exceeding the load.

  In this case, the reason for using virgin pulp paper without using waste paper or recycled paper is that, if used paper is used, the fiber 22 of the paper falls off when the groove portion 22 constituting the folding line portion 17 is formed. It is because it is impossible to form an angle of 100 degrees as much as possible, and the used paper has no strength or so-called stiffness, and when a groove is formed in the folding part, paper dust is exposed and remains as a foreign matter inside, This is because it may not be possible to ensure a bending angle of 100 degrees of the side surface covering portion 18.

  In the present embodiment, the reason why the width dimension of the side surface covering portion 18 is 4.9 cm is that a step of 1 mm is created with respect to the width dimension (5.0 cm) of the side surface portion 15 of the lunch box body 11. When the rubber band 23 is mounted, the rubber band 23 is sufficiently locked to both the side surface covering portion 18 and the side surface portion 15 through the stepped portion, and the other lunch box is placed on the upper side by loading. This is because it is possible to more effectively prevent the side surface covering portion 18 from being folded upward.

Moreover, the resin film may be affixed on the surface or back surface of the cover part 13, or both surfaces. This resin film may be formed as a film layer, for example, by a coating process such as polypropylene.
In this way, when the resin film is adhered to the lid portion 13, the thickness dimension of the lid portion 13 is increased as compared with the case of mere thick paper, and at the same time, the stress of the lid portion 13 is caused by the resin coating layer. Increases further. As a result, it is possible to provide a lunch box that can further improve the rigidity of the lid 13 and can support a large number of lunch boxes more stably when the lunch box 10 is placed on the upper side.
Further, when a resin film is adhered or formed on the front surface and / or the back surface of the lid portion 13, the side surface covering portion 18 and the lid portion main body 16 are firmly bonded so as not to be separated by the groove portion 22. Also serves to keep.

  As a result, the lunch box filled with other food is placed on the lunch box formed in this way, and the bottom of the lunch box body of the upper lunch box is the lid body of the lower lunch box. Even when a predetermined weight is applied to the lid body, the stress on the lid body increases as described above, so the weight of the upper lunch box is reliably supported. However, unlike the conventional case, the lid portion of the lunch box is not broken by the weight of the lunch box stacked in the upper stage.

The size, length, and width dimension of the lunch box body in the present embodiment, the thickness dimension, the length dimension, and the width dimension of the lid are not limited to the present embodiment.
In the present embodiment, the angle of the groove portion 22 is formed to be 100 degrees or more, and the side surface covering portion 18 of the lid portion 13 is folded back at an angle of 80 degrees or less with respect to the lid body. However, the present invention is not limited to this embodiment, and may be 120 degrees or 140 degrees as long as the angle of the groove 22 is 100 degrees or more.
Thus, in the case of 120 degrees, the bending angle of the side surface covering portion 18 is 60 degrees, and in the case of 140 degrees, the bending angle of the side surface covering portion 18 is 40 degrees.
Therefore, when the side surface portion 15 of the lunch box body 11 is formed to rise at an angle of 80 degrees, and the bending angle of the side surface covering portion 18 is 60 degrees or 40 degrees, the side surface covering portion 18 is 80 degrees. Since the bending angle is larger than that in the case, the side surface covering portion 18 is pressed against the side surface portion 15 with a larger contact force than that in the case of 100 degrees. It will be in close contact.

Since the present invention can be widely applied to lunch boxes, it has industrial applicability.

DESCRIPTION OF SYMBOLS 10 Lunch box 11 Lunch box main body 12 Opening part 13 Cover part 14 Bottom part 15 Side part 16 Cover part main body 17 Folding part 18 Side surface covering part 19 Main body part 20 Arc-shaped outline part 21 Corner part 22 Groove part 23 Rubber band L1 Length side length L2 of the side portion of the box L Side length length of the side portion of the lunch box body H Height dimension of the side portion of the lunch box body

Claims (7)

It is made of whole paper, and has a lunch box body that contains food, and a lid that covers the opening of the lunch box body so that it can be opened and closed. Is a lunch box having an inclination angle in which the area of the opening is larger,
The lid portion is formed of a single sheet of cardboard, and a lid portion body that can cover the opening of the lunch box body, and the lid portion body is connected to the lid portion body via a folding line portion, and is bent. A side surface covering portion having a width dimension capable of covering substantially the entire height direction of the side surface portion of the box body, and the folding line portion is between the lid body and the side surface covering portion on the back surface side of the lid portion. Formed by the groove provided in
When the lid is attached to the lunch box body, the lid is fixed to the lunch box by hanging a rubber band around the lid and the lunch box.   The lunch box according to claim 1, wherein the bent portion is provided over the entire area between the lid body and the side surface covering portion.   The lunch box according to claim 1, wherein the side surface covering portion has a width dimension slightly smaller than a width dimension of a side surface portion of the lunch box body.   The lunch box body is formed in a reverse-prefixed quadrangular pyramid shape, while the lid body is formed in a square shape, and the side surface covering portions are connected to each side of the lid body. The lunch box according to claim 3.   The lunch box according to claim 1, wherein a resin film is attached to the lid portion.   The side surface portion of the lunch box body is erected at an angle of 80 degrees with respect to the bottom surface portion of the lunch box body, and the angle of the groove portion is formed to be 100 degrees or more, and the side surface covering portion of the lid portion is The lunch box according to claim 1, wherein the lunch box is folded at an angle of 80 degrees or less with respect to the lid main body. The groove portion has a substantially V-shaped cross section and is formed over almost the entire region in the thickness direction of the lid main body, and a portion having a slight thickness remaining between the lid main body and the side surface covering portion. The lunch box according to claim 1, wherein the lunch box is joined together.