Storage box

Abstract

To make it easy to open and close a storage box formed by folding a sheet.SOLUTION: A storage box (1) includes: a first half box body (10) which is formed of a first region, and has a bottom plate part (11), a pair of side wall parts (12, 13), a from wall part (14) between front ends of the pair of side wall parts, and an upper opening; a second half box body (20) which is formed of a second region, and has a top face part, a pair of side face parts, and a front face part between front ends of the pair of side face parts; a connection part (30) which is formed of a third region, and connects a rear end of the bottom plate part and a rear end of the top face part; and an auxiliary spring part (40) which is folded over at least the front face part, top face part, and connection part and formed of a fourth region, and has a first surface (41) overlapping with the front face part, a second surface (42) overlapping the top face part, and a third surface (43) overlapping with the connection part, the auxiliary energizing part energizing the second half box body toward an opening position at a closing position where the opening is covered with the half box body.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a storage box.

Background Art

[0002] For example, a sheet such as paper is folded to create a box with a lid. Such boxes are used as storage boxes for various products.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When creating a box by folding a sheet, there were restrictions on the mechanisms that could be provided.

[0005] One object of the present disclosure is to provide a storage box formed by folding a sheet and having easy opening and closing.

Means for Solving the Problems

[0006] (1) A storage box including a first half box body formed by a first region of a sheet, having a bottom plate portion, a pair of side wall portions, a front wall portion between front ends of the pair of side wall portions, and at least an upwardly open opening; a second half box body formed by a second region of the sheet, having an upper surface portion, a pair of side surface portions, and a front surface portion between front ends of the pair of side surface portions; a third region of the sheet connecting the first region and the second region, having a connecting portion connecting a rear end of the bottom plate portion and a rear end of the upper surface portion; and an auxiliary spring portion formed by a fourth region of the sheet that is folded at least onto the front surface portion, the upper surface portion, and the connecting portion, having a first surface overlapping the front surface portion, a second surface overlapping the upper surface portion, and a third surface overlapping the connecting portion, wherein the auxiliary spring portion biases the storage box toward an open position for opening the opening when the second half box body covers above the opening at a closed position.

[0007] (2) In (1), the auxiliary spring portion is formed by a fourth region of the sheet that is folded onto the front surface portion, the upper surface portion, the connecting portion, and the bottom plate portion, and further has a fourth surface overlapping the bottom plate portion.

[0008] (3) In (2), the storage box further includes an inner bottom portion disposed on the bottom plate portion and the fourth surface of the first half box body and locked to the first half box body.

[0009] (4) In any one of (1) to (3), the second surface of the auxiliary spring portion is engaged with the second half box body slidably in the front-rear direction.

[0010] (5) In any one of (1) to (4), at a boundary between the second surface and the third surface of the sheet, there is provided a rib with a convex side on the side of the connecting portion and the upper surface portion and a concave side on the opposite side, and the sheet is bent along the rib.

[0011] (6) In any one of (1) to (5), an engaging portion engageable with the first half box body is provided on the front surface portion.

Advantages of the Invention

[0012] According to the present disclosure, the opening and closing of a storage box formed by folding a sheet becomes easier.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The embodiments described in this specification are merely examples of a storage box, and appropriate modifications within the scope of maintaining the gist of the invention are included in the scope of the present invention. Also, the width, thickness, shape, etc. of each part shown in the drawings are examples, and the width, thickness, shape, etc. of each part shown in the drawings do not limit the scope of the present invention.

[0015] [Outline of the Configuration of the Storage Box 1] FIG. 1 is a perspective view showing the storage box 1 according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the storage box 1 with the lid portion 20 open. FIG. 3 is a side view of the storage box 1 shown in FIG. 2. FIG. 4 is a perspective view showing the storage box 1 with the inner bottom portion 50 removed. FIG. 5 is a cross-sectional view of the storage box 1 shown in FIG. 2. FIG. 5 shows a cross-section when the storage box 1 is cut along a cross-section perpendicular to the X-axis. FIG. 6 is a view showing the sheet constituting the storage box 1. Hereinafter, in the following description, the X-axis direction shown in FIG. 2 is the width direction, the Y-axis direction is the front-rear direction, and the Z-axis direction is the height direction.

[0016] As shown in FIGS. 1, 2, 4, etc., the storage box 1 has a storage portion 10, a lid portion 20, a connection portion 30, an auxiliary spring portion 40, and an inner bottom portion 50. The storage portion 10 has a bottom plate portion 11, a pair of side wall portions 12, 13, a front wall portion 14, and bottom flaps 15, 16, 17 (see FIG. 4). The lid portion 20 has an upper surface portion 21, a pair of side surface portions 22, 23, a front surface portion 24, a locking portion 25, and upper flaps 26, 27. The connection portion 30 is a portion that connects the storage portion 10 and the lid portion 20, and includes a substantially rectangular main body and guide portions 31, 32 inserted into the side surface portions 22, 23. The auxiliary spring portion 40 has a first surface 41, a second surface 42, a third surface 43, and a fourth surface 44. The inner bottom portion 50 has a rear wall portion 51, a first inner bottom surface 52, a second inner bottom surface 53, a partition 54, and a protection plate 55 (see FIG. 5). Note that FIG. 5 shows the storage box 1 cut by a cross-section perpendicular to the X-axis passing through the locking portion 25.

[0017] Among the storage box 1, the storage portion 10, the lid portion 20, the connection portion 30, and the auxiliary spring portion 40 are made of a single sheet. FIG. 6 is a view showing the sheet constituting the storage box 1. The sheet includes a first region 71, a second region 72, a third region 73, and a fourth region 74. The first region 71 is a region that constitutes the storage portion 10, the second region 72 is a region that constitutes the lid portion 20, the third region 73 is a region that constitutes the connection portion 30, and the fourth region 74 is a region that constitutes the auxiliary spring portion 40. The first region 71 and the third region 73, the third region 73 and the second region 72, and the second region 72 and the fourth region 74 are connected to each other.

[0018] The outer surface of the storage box 1 and the surface of the auxiliary spring portion 40 on the storage portion 10 side are constituted by the front side of the sheet. One sheet may be a sheet-like material such as, for example, cardboard, thick coated paper, resin sheet, etc., as long as it can be bent through a fold line. Note that the inner bottom portion 50 is made of a sheet different from the above sheet.

[0019] As can be seen from FIG. 6, the storage portion 10 further includes a pair of outer connecting plates 181 and 182 and a pair of inner connecting plates 191 and 192, which are hidden in FIGS. 1 to 4. Further, the lid portion 20 further includes a pair of sandwiched portions 291 and 292, which are hidden in FIGS. 1 to 4.

[0020] [Configuration of the storage portion 10] The storage portion 10 stores an object to be stored (for example, a toy including a plurality of cards). The storage portion 10 is a part (the first half box body) constituting a part of the storage box 1. The portion constituted by the bottom plate portion 11, the side wall portions 12 and 13, and the front wall portion 14 corresponds to four sides of a rectangular parallelepiped. Further, the storage portion 10 has at least an opening that opens upward. When there is no inner bottom portion 50, the opening opens upward and rearward, corresponding to the location where there is no surface among the above-mentioned rectangular parallelepiped. In FIG. 2 and the like, the opening of the storage portion 10 facing rearward is blocked by the rear wall portion 51 of the inner bottom portion 50. The rear end of the bottom plate portion 11 is connected to the connecting portion 30.

[0021] The side wall portion 12 includes an outer side wall 121 connected to the bottom plate portion 11 and an inner side wall 122 disposed inside thereof. The outer side wall 121 and the inner side wall 122 are folded along the upper end fold line and overlap each other. The side wall portion 13 includes an outer side wall 131 connected to the bottom plate portion 11 and an inner side wall 132 disposed inside thereof. The outer side wall 131 and the inner side wall 132 are folded along the upper end fold line and overlap each other.

[0022] The lower ends of the inner walls 122 and 132 are respectively connected to the bottom flaps 15 and 16. The bottom flaps 15 and 16 do not overlap with the fourth surface 44 of the auxiliary spring portion 40. The bottom flaps 15 and 16 are substantially rectangular, and the length in the width direction thereof is smaller than the distance between the inner walls 122 and 132 and the fourth surface 44.

[0023] The front wall portion 14 includes an outer front wall 141 connected to the bottom plate portion 11 and an inner front wall 142 disposed inside thereof. The outer front wall 141 and the inner front wall 142 are folded along the upper end fold line and overlap each other. The lower end of the inner front wall 142 is connected to the bottom flap 17, and the bottom flap 17 does not overlap with the fourth surface 44 of the auxiliary spring portion 40. The length of the bottom flap 17 in the front-rear direction is smaller than the distance between the inner front wall 142 and the fourth surface 44.

[0024] The outer connecting plates 181 and 182 are respectively connected to the front ends of the outer walls 121 and 131 and are clamped between the outer front wall 141 and the inner front wall 142. The inner connecting plates 191 and 192 are respectively connected to the left and right sides of the inner front wall 142. The inner connecting plate 191 is clamped between the outer wall 121 and the inner wall 122. The inner connecting plate 192 is clamped between the outer wall 131 and the inner wall 132. A slit 111 having a size corresponding to the locking portion 25 is provided at the central portion of the boundary between the bottom plate portion 11 and the front wall portion 14.

[0025] [Configuration of the lid portion 20] When the lid portion 20 is in its closed position (closed state), it covers the storage portion 10 together with the connecting portion 30. Also, in this closed position, the lid portion 20 covers the upper part of the opening of the storage portion 10. The lid portion 20 is a part (the second half box body) that constitutes a part of the storage box 1. The part composed of the upper surface portion 21, the side surface portions 22, 23, and the front surface portion 24 corresponds to four sides of a rectangular parallelepiped. The boundaries between the lid portion 20 and the connecting portion 30, and between the connecting portion 30 and the bottom plate portion 11 are fold lines, and the lid portion 20 and the connecting portion 30 can change their directions around these fold lines. As a result, the lid portion 20 can move between the closed position and the open position where the opening is opened. The angles formed by the upper surface portion 21 and the main body of the connecting portion 30, and between the main body of the connecting portion 30 and the bottom plate portion 11 are minimized in the closed position. In the closed position, the upper surface portion 21 and the bottom plate portion 11 are substantially parallel, and the angle formed by the upper surface portion 21 and the bottom plate portion 11 increases due to the movement from the closed position, and this angle may exceed 90 degrees in the open position.

[0026] The side surface portion 22 includes an outer surface 221 connected to the upper surface portion 21 and an inner surface 222 disposed inside thereof. The outer surface 221 and the inner surface 222 are folded along the fold line at the lower end and overlap each other. The side surface portion 23 includes an outer surface 231 connected to the upper surface portion 21 and an inner surface 232 disposed inside thereof. The outer surface 231 and the inner surface 232 are folded along the fold line at the lower end and overlap each other. Notches 223 and 233 are provided at the upper rear ends of the inner surfaces 222 and 232.

[0027] The upper ends of the inner surfaces 222 and 232 are respectively connected to upper flaps 26 and 27. The upper flaps 26 and 27 have a shorter length in the front-rear direction than the inner surfaces 222 and 232, and the rear ends of the upper flaps 26 and 27 are connected to the front ends of the notches 223 and 233.

[0028] Narrowed portions 291 and 292 to be held are connected to the left and right of the front surface portion 24. The narrowed portion 291 is held between the outer surface 221 and the inner surface 222. The narrowed portion 292 is held between the outer surface 231 and the inner surface 232.

[0029] A locking portion 25 that protrudes downward from the front portion 24 is connected to the lower center of the front portion 24. When the lid portion 20 is in the closed position, the locking portion 25 can be engaged with the slit 111 of the storage portion 10 to lock the lid portion 20 to the storage portion 10. At the center in the left - right direction of the front portion 24, there are two cuts from the lower side. The length of the cut is less than half of the height of the front portion 24. The locking portion 25 includes a portion that protrudes downward from the front portion 24 and a portion between the cuts. The cut makes it possible to easily lock the locking portion 25 to the slit 111.

[0030] [Configuration of the connecting portion 30] The main body of the connecting portion 30 constitutes the rear - side surface of the exterior of the storage box 1. On the left and right of the main body of the connecting portion 30, guide portions 31, 32 are connected. The guide portion 31 is slidably narrowed between the outer surface 221 and the inner surface 222. The guide portion 32 is slidably narrowed between the outer surface 231 and the inner surface 232. Since they are slidably sandwiched, the guide portions 31, 32 do not interfere with the movement of the lid portion 20 between the open position and the closed position.

[0031] [Configuration of the auxiliary spring portion 40] The auxiliary spring portion 40 is connected to the front portion 24 and is bent inside the storage box 1 with its boundary as a fold line. More specifically, the fourth region 74 of the sheet is folded over the front portion 24, the upper surface portion 21, the connecting portion 30, and the bottom plate portion 11. The first surface 41, the second surface 42, the third surface 43, and the fourth surface 44 of the auxiliary spring portion 40 overlap the front portion 24, the upper surface portion 21, the connecting portion 30, and the bottom plate portion 11, respectively. The auxiliary spring portion 40 biases toward the open position for opening the opening when the lid portion 20 is in the closed position covering above the opening.

[0032] At the boundaries between the first surface 41 and the second surface 42, between the second surface 42 and the third surface 43, and between the third surface 43 and the fourth surface 44, the fourth region 74 of the sheet is bent in a valley fold. Due to the restoring force of the bent sheet, in the closed position, the auxiliary spring 40 biases toward the open position. The restoring force of the sheet occurs particularly between the second surface 42 and the third surface 43 and between the third surface 43 and the fourth surface 44.

[0033] At each of the boundaries between the first surface 41 and the second surface 42, between the second surface 42 and the third surface 43, and between the third surface 43 and the fourth surface 44, there are provided in advance ribs (crease lines) where the back side of the sheet is convex and the front side is concave. The back side of the sheet is on the lid part 20 side, and the front side of the sheet is on the storage part 10 side. The auxiliary spring part 40 is bent along these ribs. When ribs are provided on the sheet, generally, in order to maintain the shape, it is folded so that the convex part is on the inside. On the other hand, in the auxiliary spring part 40, by deliberately folding it in the opposite direction, the restoring force in the direction in which the fold opens can be further increased. Also, the auxiliary spring part 40 and the lid part 20 are in contact via the convex part, and the friction coefficient can also be suppressed.

[0034] At the rear end of the second surface 42, engaging protrusions 45, 46 protruding in the left - right direction are provided. The engaging protrusions 45, 46 are slidably engaged with the notches 223, 233 on the inner surfaces 222, 232. Thereby, the second surface 42 is slidably engaged with the lid part 20 in the front - rear direction. Note that the third surface 43 is not engaged with the connecting part 30. Also, the fourth surface 44 does not need to be engaged with the storage part 10.

[0035] The length of the fourth surface 44 in the width direction is smaller than that of the third surface 43, and the fourth surface 44 is arranged at the center in the width direction. The length of the fourth surface 44 in the front - rear direction is less than or equal to half of the length of the bottom plate part 11 in the front - rear direction. The fourth surface 44 does not overlap with the bottom flaps 15, 16, 17 and is covered by the inner bottom part 50 together with the bottom flaps 15, 16, 17.

[0036] [Configuration of the inner bottom part 50] The rear wall portion 51 of the inner bottom 50 closes the opening at the rear of the storage portion 10. Connecting plates (not shown respectively) are connected to the left and right of the rear wall portion 51, and the connecting plates are clamped between the inner side walls 122, 132 and the outer side walls 121, 131. Thereby, the rear wall portion 51 is locked to the side wall portions 12, 13. The first inner bottom surface 52 and the second inner bottom surface 53 cover the upper part of the bottom plate portion 11, the bottom flaps 15, 16, 17, and the fourth surface 44. Since the bottom flaps 15, 16, 17 and the fourth surface 44 do not overlap, the frictional force between the first inner bottom surface 52 and the second inner bottom surface 53 and the fourth surface 44 is reduced.

[0037] The first inner bottom surface 52 is connected to the rear wall portion 51 at the rear end. The partition 54 is provided on the boundary between the first inner bottom surface 52 and the second inner bottom surface 53. The partition 54 has a surface with the lower end connected to the first inner bottom surface 52 and a surface with the lower end connected to the second inner bottom surface 53, and these surfaces are connected at the upper end. The protection plate 55 extends in the left - right direction from the front end of the partition 54 and overlaps the front wall portion 14.

[0038] [Operation during opening and closing] The lid portion 20 may be locked to the storage portion 10 by the locking portion 25 in the closed position. As shown in FIG. 1, thereby, the state where the lid portion 20 covers the opening of the storage portion 10 (closed state) is maintained. In this state, a force toward the open position is applied to the lid portion 20 by the auxiliary spring portion 40. When the locking by the locking portion 25 is released by a person (user) who tries to open the storage box 1, due to the force toward the open position, the lid portion 20 moves toward the open position even if the user does not perform an operation to open the lid portion 20. With repeated use, the force applied by the deformation of the auxiliary spring portion 40 may weaken, but even in that case, the user can move the lid portion 20 toward the open position with a weaker force by that force. Note that in the closed position, a force in the same direction is applied to the lid portion 20 to some extent by the folds of the bottom plate portion 11, the connecting portion 30, and the upper surface portion 21, which facilitates opening the storage box 1 in combination with the force by the auxiliary spring portion 40.

[0039] In addition, due to the presence of the auxiliary spring portion 40, at least when starting to use the storage box 1, when the locking by the locking portion 25 or the like is released, the lid portion 20 moves toward the open position without the user applying force. Since this is a movement like that of a kind of jack-in-the-box, the storage box 1 can provide a fresh experience to the user. Also, since no force is required for opening and closing, or the operation of opening and closing is not necessary, a more comfortable experience can be provided to the user.

[0040] By the way, the dimensions of the auxiliary spring portion 40 may be configured to be smaller than the bottom plate portion 11, the connecting portion 30, and the inner side of the upper surface portion 21 when the lid portion 20 is in the closed position. In this case, for the second surface 42 and the third surface 43 to fit exactly on the inner sides of the bottom plate portion 11, the connecting portion 30, and the upper surface portion 21 even when the lid portion 20 moves to the open position, the length in the front-rear direction of the second surface 42 and the third surface 43 is insufficient. Therefore, the engaging protrusions 45, 46 at the rear end of the second surface 42 move forward in the notches 223, 233 at this time. Then, as the lid portion 20 moves toward the open position, the vicinity of the rear end of the second surface 42 moves away from the upper surface portion 21 and the connecting portion 30 (see FIG. 5). Thereby, the generation of resistance when the storage box 1 is opened is suppressed. Note that the engaging protrusions 45, 46 may move downward somewhat in the notches 223, 233. The fourth surface 44 may be slidably sandwiched between the inner bottom portion 50 and the bottom plate portion 11. In this case, the resistance when the storage box 1 is opened can also be suppressed by the movement of the fourth surface 44.

[0041] [Method of assembling the storage box 1] A method of assembling the storage portion 10, the lid portion 20, etc. of the storage box 1 from the sheet shown in FIG. 6 will be described. In FIG. 6, the solid line showing the outer shape, the solid line shown at the tear 111, the solid line shown between the locking portion 25 and the first surface 41, and the solid line extending in the left-right direction at the boundary between the locking portion 25 and the front surface portion 24 are lines for cutting the sheet. It is assumed that these solid lines are already cut at the start of assembly.

[0042] In FIG. 6, the solid lines excluding the above-mentioned ones indicate the locations of mountain folds. The dashed lines indicate the locations of valley folds. Before starting the folding, ribs are formed in advance on the front side to be concave and on the back side to be convex at the locations of mountain folds and valley folds. Here, at the locations of valley folds, excluding the locations within the auxiliary spring portion 40, ribs may be formed with the front side being convex and the back side being concave.

[0043] First, the assembly of the connection portion 30 and the lid portion 20 will be described. First, the sheet is bent at the boundary between the connection portion 30 and the bottom plate portion 11 and at the boundary between the connection portion 30 and the upper surface portion 21. Next, the sheet is bent at the boundary between the main body of the connection portion 30 and the guide portions 31, 32, and at the boundary between the front surface portion 24 and the clamped portions 291, 192. Next, the sheet is bent at the boundary between the inner surfaces 222, 232 and the upper flaps 26, 27. Also, the sheet is bent at the boundary between the outer surface 221 and the inner surface 222 so that the clamped portion 291 and the guide portion 31 are sandwiched therebetween, and the sheet is bent at the boundary between the outer surface 231 and the inner surface 232 so that the clamped portion 292 and the guide portion 32 are sandwiched therebetween.

[0044] When the connection portion 30 and the lid portion 20 are assembled, the auxiliary spring portion 40 is assembled. The sheet is bent at the boundary between the front surface portion 24 and the first surface 41, and the sheet is bent at the boundaries between the first surface 41 and the second surface 42, between the second surface 42 and the third surface 43, and between the third surface 43 and the fourth surface 44. At this time, the first surface 41, the second surface 42, the third surface 43, and the fourth surface 44 are respectively folded onto the front surface portion 24, the upper surface portion 21, the connection portion 30, and the bottom plate portion 11. Also, at this time, the engaging protrusions 45, 46 on the second surface 42 are engaged with the notches 223, 233 on the inner surfaces 222, 232.

[0045] Next, the assembly of the storage unit 10 will be described. The boundary between the bottom plate portion 11 and the outer side walls 121, 131 is bent, and further, the boundary between the outer side walls 121, 131 and the outer connecting plates 181, 182 is bent. Next, the boundary between the bottom plate portion 11 and the outer front wall 141, the boundary between the inner front wall 142 and the inner connecting plates 191, 192, and the boundary between the inner front wall 142 and the bottom flap 17 are bent. Then, the boundary between the outer front wall 141 and the inner front wall 142 is bent. At this time, the outer connecting plates 181, 182 are clamped between the outer front wall 141 and the inner front wall 142. Next, the boundary between the inner side walls 122, 132 and the bottom flaps 15, 16 is bent, and the boundary between the outer side walls 121, 131 and the inner side walls 122, 132 is bent. At this time, the inner connecting plates 191, 192 are clamped between the outer side walls 121, 131 and the inner side walls 122, 132.

[0046] When the storage unit 10, the lid unit 20, the auxiliary spring unit 40, etc. are assembled, the properly bent inner bottom portion 50 is attached to the storage unit 10, and the storage box 1 is completed. At the time of attachment, the connecting plate connected to the rear wall portion 51 is inserted between the outer side walls 121, 131 and the inner side walls 122, 132. Note that the order of assembly of the storage box 1 shown here is an example, and the actual assembly may be performed in an order different from the above.

[0047] [Modification Example] The storage box 1 is not limited to what has been described so far. For example, the width of the storage box 1 may be even larger. FIG. 7 is a perspective view showing another storage box 1 according to an embodiment of the present invention. In the example of FIG. 7, the width is wider than that of the storage box 1 described in FIG. 2 etc., and a plurality of partitions 54 are provided.

[0048] Other parts may also be different. For example, the storage box 1 may not include the fourth surface 44. Even in this case, the auxiliary spring portion 40 can be biased toward the open position in the closed position. However, in this case, the restoring force (biasing force) of the auxiliary spring portion 40 becomes weaker. Also, the storage box 1 may not have at least a part of the inner bottom portion 50, the locking portion 25, and the guide portions 31 and 32. Even in this case, the storage box 1 and the auxiliary spring portion 40 can perform their functions. When there is no locking portion 25, the lid portion 20 may be held in the closed position by other methods (for example, an adhesive seal or a rubber ring). Note that a part of the storage portion 10, the lid portion 20, the connecting portion 30, and the auxiliary spring portion 40 of the storage box 1 may be constituted by another sheet.

[0049] The restoring force of the auxiliary spring portion 40 may be adjusted according to the material characteristics of the sheet and the size of the storage box 1. For the adjustment, perforations may be provided in the creases provided in the fourth region of the sheet, particularly in the creases at the boundary between the second surface 42 and the third surface 43 and at the boundary between the third surface 43 and the fourth surface 44. FIG. 8 is a diagram showing an example of perforations. Any one of the plurality of perforations shown in FIG. 8 may be provided in the above-mentioned creases. The lengths and intervals of the plurality of slits constituting the perforations may be appropriately adjusted according to the required restoring force.

[0050] Also, for the adjustment of the restoring force, the length in the width direction of the crease portion of the auxiliary spring portion 40 may be adjusted. By at least any one of these adjustments, for example, when the lid portion 20 is lightweight, it is possible to prevent the restoring force of the auxiliary spring portion 40 from becoming excessive.

[0051] In the present embodiment, an example in which the planar shapes of the storage portion 10 and the lid portion 20 are rectangular has been shown, but the present invention is not limited to this. For example, the front wall portion 14 and the front surface portion 24 may be composed of a plurality of surfaces, and the planar shapes of the storage portion 10 and the lid portion 20 may be polygons other than quadrilaterals.

Explanation of Reference Numerals

[0052] 1 storage box, 10 storage part, 11 bottom plate part, 12, 13 side wall parts, 14 front wall part, 15, 16, 17 bottom flaps, 20 lid part, 21 top surface part, 22, 23 side surface parts, 24 front surface part, 25 locking part, 26, 27 top flaps, 30 connecting part, 31, 32 guiding parts 40 auxiliary spring part, 41 first surface, 42 second surface, 43 third surface, 44 fourth surface, 45, 46 engaging protrusions, 50 inner bottom part, 51 rear wall part, 52 first inner bottom surface, 53 second inner bottom surface, 54 partition, 55 protection plate, 71 first region, 72 second region, 73 third region, 74 fourth region, 111 crack, 121, 131 outer side walls, 122, 132 inner side walls, 141 outer front wall, 142 inner front wall, 181, 182 outer connecting plates, 191, 192 inner connecting plates, 221, 231 outer side surfaces, 222, 232 inner side surfaces, 223, 233 notches, 291, 292 parts to be pinched

Claims

1. A first half box body composed of a first region of the sheet, having a bottom plate portion, a pair of side wall portions, a front wall portion between the front ends of the pair of side wall portions, and at least an opening opened upward; A second half box body composed of a second region of the sheet, having an upper surface portion, a pair of side surface portions, and a front surface portion between the front ends of the pair of side surface portions; A third region of the sheet that connects the first region and the second region in the sheet, having a connecting portion that connects the rear end of the bottom plate portion and the rear end of the upper surface portion; Including an auxiliary spring portion composed of a fourth region of the sheet that is folded at least on the front surface portion, the upper surface portion, and the connecting portion, having a first surface that overlaps the front surface portion, a second surface that overlaps the upper surface portion, and a third surface that overlaps the connecting portion; The auxiliary spring portion biases toward an open position that opens the opening in a closed position where the second half box body covers above the opening; A storage box.

2. In the storage box according to Claim 1, The auxiliary spring portion is composed of a fourth region of the sheet that is folded on the front surface portion, the upper surface portion, the connecting portion, and the bottom plate portion, and further has a fourth surface that overlaps the bottom plate portion; A storage box.

3. In the storage box according to Claim 2, Further including an inner bottom portion that is disposed on the bottom plate portion of the first half box body and the fourth surface and is locked to the first half box body; A storage box.

4. In the storage box according to Claim 1, Among the auxiliary spring portions, the second surface is slidably engaged with the second half box body in the front-rear direction; A storage box.

5. In the storage box according to Claim 1, At the boundary between the second surface and the third surface of the sheet, a rib is provided where the side of the connecting portion and the upper surface portion is convex and the opposite side is concave, and the sheet is bent along the rib; A storage box.

6. In the storage box according to Claim 1, An engaging portion that can be engaged with the first half box body is provided on the front surface portion; A storage box.

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