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 making a box by folding a sheet, there are restrictions on the mechanisms that can be provided.

[0005] One object of the present disclosure is to provide a storage box formed by folding a sheet and that is easy to open and close.

Means for Solving the Problems

[0006] (1) A storage box comprising: a first half-box body composed of a first region of a 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 that opens upward; a second half-box body composed of a second region of the sheet, having a top surface portion, a pair of side portions, and a front surface portion between the front ends of the pair of side portions; a connecting portion composed of a third region of the sheet connecting the first region and the second region, connecting the rear end of the bottom plate portion and the rear end of the top surface portion; and an auxiliary spring portion composed of a fourth region of the sheet that is folded over at least the front surface portion, the top surface portion and the connecting portion, having a first surface that overlaps with the front surface portion, a second surface that overlaps with the top surface portion, and a third surface that overlaps with the connecting portion, wherein the auxiliary spring portion biases the second half-box body toward an open position that opens the opening when the second half-box body is in a closed position covering the top of the opening.

[0007] (2) In (1), the auxiliary spring portion is composed of a fourth region of the sheet which is folded over the front portion, the top portion, the connecting portion and the bottom plate portion, and further has a fourth surface which overlaps with the bottom plate portion, a storage box.

[0008] (3)(2) A storage box further comprising an inner bottom portion disposed on the bottom plate portion and the fourth surface of the first half-box and secured to the first half-box.

[0009] (4) In any of (1) to (3), the second surface of the auxiliary spring portion is engaged with the second half-box body so as to be slidable in the front-rear direction, a storage box.

[0010] (5) In any of (1) to (4), a ridge is provided at the boundary between the second surface and the third surface of the sheet, where the side of the connecting portion and the upper surface portion is convex and the opposite side is concave, and the sheet is folded along the ridge.

[0011] (6) A storage box in which, in any of (1) to (5), the front portion is provided with an engaging portion that can engage with the first half-box body. [Effects of the Invention]

[0012] According to this disclosure, the opening and closing of the storage box formed by folding the sheet becomes easier. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view showing a storage box according to an embodiment of the present invention. [Figure 2] This is a perspective view showing a storage box with its lid open. [Figure 3] Figure 2 is a side view of the storage box shown. [Figure 4] This is a perspective view showing a storage box with its inner bottom removed. [Figure 5] Figure 2 is a cross-sectional view of the storage box shown. [Figure 6] This diagram shows the sheets that make up the storage box. [Figure 7] A perspective view showing another storage box according to an embodiment of the present invention. [Figure 8] This figure shows an example of perforation. [Modes for carrying out the invention]

[0014] The embodiments of this disclosure will be described below with reference to the drawings. The embodiments described herein are merely examples of storage boxes, and any appropriate modifications within the scope of the invention are permitted while maintaining the spirit of the invention. Furthermore, the widths, thicknesses, shapes, etc. of the parts shown in the drawings are examples only, and the widths, thicknesses, shapes, etc. of the parts shown in the drawings do not limit the scope of the invention.

[0015] [Overview of the contents of 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 opened. 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 constituting the storage portion 10, the second region 72 is a region constituting the lid portion 20, the third region 73 is a region constituting the connection portion 30, and the fourth region 74 is a region constituting 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, respectively.

[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. 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 has a pair of outer connecting plates 181, 182 and a pair of inner connecting plates 191, 192 that are hidden in FIGS. 1 to 4. The lid portion 20 further has a pair of sandwiched portions 291, 292 that 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) that constitutes a part of the storage box 1. The part constituted by the bottom plate portion 11, the side wall portions 12, 13, and the front wall portion 14 corresponds to four sides of a rectangular parallelepiped. The storage portion 10 also 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 in the above-mentioned rectangular parallelepiped. In FIG. 2 and the like, the opening facing the rear of the storage portion 10 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 it. The outer side wall 121 and the inner side wall 122 are folded along the upper end fold 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 it. The outer side wall 131 and the inner side wall 132 are folded along the upper end fold and overlap each other.

[0022] The lower ends of the inner walls 122 and 132 are connected to the bottom flaps 15 and 16, respectively. 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 approximately rectangular, and their length in the width direction is less 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 positioned inside it. The outer front wall 141 and the inner front wall 142 are folded at their upper ends 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 less than the distance between the inner front wall 142 and the fourth surface 44.

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

[0025] [Configuration of the lid 20] The lid 20, in its closed position, covers the storage section 10 together with the connecting section 30. In this closed position, the lid 20 also covers the upper part of the opening of the storage section 10. The lid 20 is a part that constitutes a portion of the storage box 1 (a second half-box). The portion composed of the top surface 21, side surfaces 22, 23, and front surface 24 corresponds to the four faces of a rectangular parallelepiped. The boundary between the lid 20 and the connecting section 30, and the boundary between the connecting section 30 and the bottom plate 11 are folds, and the lid 20 and the connecting section 30 can change orientation around these folds. This allows the lid 20 to move between a closed position and an open position that opens the opening. In the closed position, the angle between the top surface 21 and the main body of the connecting section 30, and the angle between the main body of the connecting section 30 and the bottom plate 11 are minimized. In the closed position, the top surface 21 and the bottom plate 11 are approximately parallel, and as the unit moves from the closed position, the angle between the top surface 21 and the bottom plate 11 increases, and in the open position, this angle may exceed 90 degrees.

[0026] The side portion 22 includes an outer surface 221 connected to the top portion 21 and an inner surface 222 located inside it. The outer surface 221 and the inner surface 222 are folded and overlapping at a fold at their lower ends. The side portion 23 includes an outer surface 231 connected to the top portion 21 and an inner surface 232 located inside it. The outer surface 231 and the inner surface 232 are folded and overlapping at a fold at their lower ends. The upper rear ends of the inner surfaces 222 and 232 have notches 223 and 233.

[0027] The upper ends of the inner surfaces 222 and 232 are connected to the upper flaps 26 and 27, respectively. The upper flaps 26 and 27 are shorter in length in the front-to-back 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] Clamped portions 291 and 292 are connected to the left and right sides of the front portion 24. Clamped portion 291 is clamped between the outer surface 221 and the inner surface 222. Clamped portion 292 is clamped between the outer surface 231 and the inner surface 232.

[0029] A locking portion 25 is connected to the lower center of the front portion 24, protruding downward from the front portion 24. When the lid portion 20 is in the closed position, the locking portion 25 can engage with the slit 111 of the storage portion 10, thereby locking the lid portion 20 to the storage portion 10. There are two notches from the bottom in the center of the front portion 24 in the left-right direction. The length of the notches is less than half 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 notches. The notches make it possible to easily engage the locking portion 25 with the slit 111.

[0030] [Configuration of connection section 30] The main body of the connecting part 30 forms the rear surface of the outer casing of the storage box 1. Guide parts 31 and 32 are connected to the left and right sides of the main body of the connecting part 30. Guide part 31 is slidably squeezed against the outer surface 221 and the inner surface 222. Guide part 32 is slidably squeezed against the outer surface 231 and the inner surface 232. Because they are slidably squeezed, the guide parts 31 and 32 do not interfere with the movement of the lid part 20 between the open position and the closed position.

[0031] [Configuration of auxiliary spring section 40] The auxiliary spring portion 40 is connected to the front portion 24 and is folded inward into the storage box 1 along its boundary. More specifically, the fourth region 74 of the sheet is folded over the front portion 24, the top 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 top portion 21, the connecting portion 30, and the bottom plate portion 11, respectively. The auxiliary spring portion 40 biases the lid portion 20 towards the open position, which opens the opening, when the lid portion 20 is in the closed position, which covers the top of 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 folded in a valley fold. The restoring force of the folded sheet biases the auxiliary spring 40 toward the open position when it is in the closed position. The restoring force of the sheet is generated particularly between the second surface 42 and the third surface 43, and between the third surface 43 and the fourth surface 44.

[0033] The boundaries between the first surface 41 and the second surface 42, the boundary between the second surface 42 and the third surface 43, and the boundary between the third surface 43 and the fourth surface 44 each have pre-formed grooves (fold lines) where the back side of the sheet is convex and the front side is concave. The back side of the sheet faces the lid 20, and the front side faces the storage section 10. The auxiliary spring section 40 is bent along these grooves. When grooves are formed in a sheet, they are generally folded so that the convex part faces inward in order to maintain the shape. On the other hand, by deliberately folding the auxiliary spring section 40 in the opposite direction, the restoring force in the direction in which the fold opens can be further increased. Also, the auxiliary spring section 40 and the lid 20 come into contact via the convex part, and the coefficient of friction is reduced.

[0034] The rear end of the second surface 42 is provided with engaging projections 45 and 46 that protrude in the left-right direction. The engaging projections 45 and 46 slidably engage with notches 223 and 233 on the inner surfaces 222 and 232. As a result, the second surface 42 slidably engages with the lid portion 20 in the front-rear direction. The third surface 43 does not engage with the connecting portion 30. The fourth surface 44 does not need to engage with the storage portion 10.

[0035] The widthwise length of the fourth surface 44 is smaller than that of the third surface 43, and the fourth surface 44 is positioned in the center when viewed in the widthwise direction. The front-to-back length of the fourth surface 44 is less than half the front-to-back length of the base plate portion 11. The fourth surface 44 does not overlap with the bottom flaps 15, 16, and 17, and together with the bottom flaps 15, 16, and 17, it is covered by the inner bottom portion 50.

[0036] [Structure of the inner bottom 50] The rear wall portion 51 of the inner bottom portion 50 closes the rear opening of the storage portion 10. Connecting plates (not shown) are connected to the left and right sides of the rear wall portion 51, and these connecting plates are sandwiched between the inner walls 122, 132 and the outer walls 121, 131. This locks the rear wall portion 51 to the side walls 12, 13. The first inner bottom surface 52 and the second inner bottom surface 53 cover the top 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 its 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 whose lower end is connected to the first inner bottom surface 52 and a surface whose lower end is connected to the second inner bottom surface 53, and these surfaces are connected at the upper end. The protective plate 55 extends from the front end of the partition 54 in the left-right direction and overlaps with the front wall portion 14.

[0038] [Operation when opening and closing] The lid 20 may be locked to the storage section 10 by the locking portion 25 when in the closed position. As shown in Figure 1, this maintains the state in which the lid 20 covers the opening of the storage section 10 (closed state). In this state, the lid 20 is biased toward the open position by the auxiliary spring portion 40. When the locking portion 25 is released by someone (user) trying to open the storage box 1, the force toward the open position causes the lid 20 to move toward the open position without the user having to operate the lid 20. With repeated use, the biasing force may weaken due to deformation of the auxiliary spring portion 40, but even in that case, the user will be able to move the lid 20 toward the open position with less force. In addition, when in the closed position, some force in the same direction is also applied to the lid 20 by the bottom plate portion 11, the connecting portion 30, and the folds of the top surface portion 21, and together with the force from the auxiliary spring portion 40, it makes it easier to open the storage box 1.

[0039] Furthermore, due to the presence of the auxiliary spring 40, at least when the storage box 1 is first used, once the locking mechanism 25 is released, the lid 20 moves towards the open position without the user having to exert any force. This movement is like a kind of surprise box, so the storage box 1 can provide the user with a fresh experience. Also, since no force is required to open or close it, or even if the user has to operate it, it can provide the user with a more comfortable experience.

[0040] Incidentally, the dimensions of the auxiliary spring portion 40 may be made smaller than those of the bottom plate portion 11, the connecting portion 30, and the top surface portion 21 so that they overlap the inside of these when the lid portion 20 is in the closed position. In this case, the length of the second surface 42 and the third surface 43 in the front-to-back direction is insufficient for them to perfectly overlap the inside of the bottom plate portion 11, the connecting portion 30, and the top surface portion 21 even when the lid portion 20 moves to the open position. Therefore, in this case, the engaging projections 45 and 46 at the rear end of the second surface 42 move forward within the notches 223 and 233. Then, as the lid portion 20 moves towards the open position, the area near the rear end of the second surface 42 moves away from the top surface portion 21 and the connecting portion 30 (see Figure 5). This suppresses the generation of resistance when the storage box 1 is opened. The engaging projections 45 and 46 may move somewhat downward within the notches 223 and 233. The fourth surface 44 may be slidably sandwiched between the inner bottom 50 and the bottom plate 11, in which case the resistance when opening the storage box 1 can be reduced by the movement of the fourth surface 44.

[0041] [How to assemble storage box 1] The method for assembling the storage section 10, lid section 20, etc. of the storage box 1 from the sheet shown in Figure 6 will be explained below. In Figure 6, the solid lines showing the outer shape, the solid lines showing the slit 111, the solid line showing the space between the locking section 25 and the first surface 41, and the solid lines extending in the left-right direction at the boundary between the locking section 25 and the front section 24 are lines for cutting the sheet. These solid lines are assumed to be already cut at the start of assembly.

[0042] In Figure 6, the solid lines, excluding those mentioned above, indicate mountain folds. The dashed lines indicate valley folds. Before folding begins, grooves are formed at the mountain and valley folds, with the front side being concave and the back side convex. In the valley folds, grooves may be formed at all locations except those within the auxiliary spring portion 40, with the front side being convex and the back side concave.

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

[0044] Once the connecting part 30 and the lid part 20 are assembled, the auxiliary spring part 40 is assembled. The sheet is folded at the boundary between the front part 24 and the first surface 41, and also at the boundary between the first surface 41 and the second surface 42, the boundary between the second surface 42 and the third surface 43, and the boundary 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 folded over the front part 24, the top surface 21, the connecting part 30, and the bottom plate part 11, respectively. Also at this time, the engaging projections 45 and 46 of the second surface 42 engage with the notches 223 and 233 of the inner surfaces 222 and 232.

[0045] Next, the assembly of the storage section 10 will be described. The boundary between the bottom plate section 11 and the outer walls 121, 131 is folded, and then the boundary between the outer walls 121, 131 and the outer connecting plates 181, 182 is folded. Next, the boundary between the bottom plate section 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 folded. Then the boundary between the outer front wall 141 and the inner front wall 142 is folded. At this time, the outer connecting plates 181, 182 are sandwiched between the outer front wall 141 and the inner front wall 142. Next, the boundary between the inner walls 122, 132 and the bottom flaps 15, 16 is folded, and the boundary between the outer walls 121, 131 and the inner walls 122, 132 is folded. In this process, the internal connecting plates 191 and 192 are sandwiched between the outer walls 121 and 131 and the inner walls 122 and 132.

[0046] Once the storage section 10, lid section 20, auxiliary spring section 40, etc. are assembled, the properly folded inner bottom section 50 is attached to the storage section 10, completing the storage box 1. During attachment, the connecting plate connected to the rear wall section 51 is inserted between the outer walls 121, 131 and the inner walls 122, 132. Note that the assembly order of the storage box 1 shown here is just one example, and the actual assembly may be carried out in a different order.

[0047] [Differentiation] The storage box 1 is not limited to those described herein. For example, the width of the storage box 1 may be even greater. Figure 7 is a perspective view showing another storage box 1 according to an embodiment of the present invention. In the example of Figure 7, the width is greater than that of the storage box 1 described in Figure 2, etc., and multiple dividers 54 are provided.

[0048] Other parts may also differ. For example, the storage box 1 does not have to include the fourth surface 44. Even in this case, the auxiliary spring 40 can still be biased toward the open position from the closed position. However, in this case, the restoring force (biasing force) of the auxiliary spring 40 will be weaker. Also, the storage box 1 does not have to have at least a part of the inner bottom 50, locking part 25, and guide parts 31, 32. Even in this case, the storage box 1 and the auxiliary spring 40 can still perform their functions. If the locking part 25 is absent, the lid 20 may be held in the closed position by other means (e.g., an adhesive seal or a rubber band). Note that some parts of the storage section 10, lid 20, connecting part 30, and auxiliary spring 40 of the storage box 1 may be made of other sheets.

[0049] The restoring force of the auxiliary spring section 40 may be adjusted according to the material properties of the sheet and the size of the storage box 1. For this adjustment, perforations may be provided in the fold lines provided in the fourth region of the sheet, particularly 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. Figure 8 shows an example of perforations. Any of the multiple perforations shown in Figure 8 may be provided in the above-mentioned fold lines. The length and spacing of the multiple slits constituting the perforations may be adjusted as appropriate to match the required restoring force.

[0050] Furthermore, the widthwise length of the folded portion of the auxiliary spring 40 may be adjusted to control the restoring force. At least one of these adjustments can prevent the restoring force of the auxiliary spring 40 from becoming excessive, for example, when the lid 20 is lightweight.

[0051] In this embodiment, an example is shown in which the planar shape of the storage section 10 and the lid section 20 is rectangular, but it is not limited to this. For example, the front wall section 14 and the front surface section 24 may consist of multiple surfaces, and the planar shape of the storage section 10 and the lid section 20 may be a polygon other than a rectangle. [Explanation of Symbols]

[0052] 1 Storage box, 10 Storage section, 11 Bottom plate section, 12, 13 Side walls, 14 Front wall section, 15, 16, 17 Bottom flap, 20 Lid section, 21 Top section, 22, 23 Side sections, 24 Front section, 25 Locking section, 26, 27 Top flap, 30 Connection section, 31, 32 Guide section, 40 Auxiliary spring portion, 41 First surface, 42 Second surface, 43 Third surface, 44 Fourth surface, 45, 46 Engaging projection, 50 Inner bottom portion, 51 Rear wall portion, 52 First inner bottom surface, 53 Second inner bottom surface, 54 Partition, 55 Protective plate, 71 First region, 72 Second region, 73 Third region, 74 Fourth region, 111 Crack, 121, 131 Outer wall, 122, 132 Inner wall, 141 Outer front wall, 142 Inner front wall, 181, 182 Outer connecting plate, 191, 192 Inner connecting plate, 221, 231 Outer surface, 222, 232 Inner surface, 223, 233 Notch, 291, 292 Clamped portion.

Claims

1. A first half-box body comprising a first region of a 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 an opening that opens at least upward, A second half-box body comprising a second region of the sheet, having an upper surface, a pair of side surfaces, and a front surface located between the front ends of the pair of side surfaces, The sheet is composed of a third region connecting the first region and the second region, and a connecting portion connecting the rear end of the bottom plate portion and the rear end of the top surface portion, It comprises a fourth region of the sheet that is folded over at least the front portion, the top portion, and the connecting portion, and includes an auxiliary spring portion having a first surface overlapping the front portion, a second surface overlapping the top portion, and a third surface overlapping the connecting portion, The auxiliary spring portion biases the second half-box body toward the open position, which opens the opening, when the second half-box body is in the closed position covering the top of the opening. The auxiliary spring portion is composed of a fourth region of the sheet that is folded over the front portion, the top portion, the connecting portion, and the bottom plate portion, and further has a fourth surface that overlaps with the bottom plate portion. The first half-box further includes an inner bottom portion that is placed on the bottom plate portion and the fourth surface of the first half-box and is locked to the first half-box, The sheet including the fourth surface is not connected to the inner bottom. Storage box.

2. A first half-box having a first region of a sheet, 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 an opening that opens at least upward, A second half-box body comprising a second region of the sheet, having an upper surface, a pair of side surfaces, and a front surface located between the front ends of the pair of side surfaces, The sheet is composed of a third region connecting the first region and the second region, and a connecting portion connecting the rear end of the bottom plate portion and the rear end of the top surface portion, It comprises a fourth region of the sheet that is folded over at least the front portion, the top portion, and the connecting portion, and includes an auxiliary spring portion having a first surface overlapping the front portion, a second surface overlapping the top portion, and a third surface overlapping the connecting portion, The auxiliary spring portion biases the second half-box body toward the open position, which opens the opening, when the second half-box body is in the closed position covering the top of the opening. The second surface of the auxiliary spring portion is engaged with the second half-box body so as to be slidable in the front-rear direction. Storage box.

3. In the storage box according to claim 1 or 2, The boundary between the second and third surfaces of the sheet is provided with grooves where the side of the connecting portion and the upper surface portion is convex and the opposite side is concave, and the sheet is folded along these grooves. Storage box.

4. In the storage box according to claim 1 or 2, The front portion is provided with an engaging portion that can engage with the first half-box body. Storage box.

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