Door structure for box

Abstract

To provide a new door structure for a box improved so that an engagement state of an engagement structure is hardly released.SOLUTION: The first engagement structure of the box door structure includes a first snap-fit mechanism that restricts the inner panel from separating in the first direction relative to the outer panel by engagement between the first inner engagement portion and the first outer engagement portion, a first protrusion that is provided on a first panel, which is one panel of the inner panel and the outer panel, and protrudes from the first panel toward a second panel, which is the other panel of the inner panel and the outer panel, and is provided on the second panel, and a first movement restricting portion that restricts movement of the first protrusion relative to the second panel in a second direction that intersects the first direction and in which the first inner engagement portion and the first outer engagement portion are separated from each other to release engagement of the first snap-fit mechanism.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a door structure for a box. [Background technology]

[0002] BACKGROUND ART Conventionally, as a door structure applied to a box such as a glove box for a vehicle, a door structure in which an inner panel and an outer panel are engaged and integrated by an engaging structure having a claw is known (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-131177 Summary of the Invention [Problem to be solved by the invention]

[0004] When this type of door structure is closed in a state where an object is caught, for example, a large force may be applied to the engagement structure. It would be beneficial to have a door structure that is difficult to disengage even in such a case.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an improved new door structure for a box, in which, for example, the engagement structure is less likely to be released from its engaged state. [Means for solving the problem]

[0006] The door structure for a box of the present invention is, for example, a door structure for a box including an inner panel, an outer panel, and an engagement structure that engages the inner panel and the outer panel at a plurality of locations to integrate them, wherein at least one of the engagement structures, a first engagement structure, has a first inner engagement portion provided on the inner panel and a first outer engagement portion provided on the outer panel and engages with the first inner engagement portion, and the engagement between the first inner engagement portion and the first outer engagement portion restricts the inner panel from moving away from the outer panel in a first direction. a first snap-fit ​​mechanism that engages the first inner panel and the first outer panel; a first protrusion that is provided on the first panel, which is one of the inner panel and the outer panel, and that protrudes from the first panel toward the second panel, which is the other of the inner panel and the outer panel; and a first movement limiting portion that is provided on the second panel and that limits movement of the first protrusion relative to the second panel in a second direction that intersects with the first direction and in which the first inner engagement portion and the first outer engagement portion move away from each other and the engagement of the first snap-fit ​​mechanism is released.

[0007] In the box door structure, the first engagement structure may have a second inner engagement portion provided on the inner panel and a second outer engagement portion provided on the outer panel that engages with the second inner engagement portion, a second snap fit mechanism that restricts the inner panel from moving away from the outer panel in the first direction relative to the outer panel by engagement between the second inner engagement portion and the second outer engagement portion, and disengages the second inner engagement portion from the second outer engagement portion when the first panel moves in the opposite direction to the second direction relative to the second panel, and a second movement limiting portion that is provided on the second panel and restricts the first protrusion from moving in the opposite direction to the second direction relative to the second panel.

[0008] In the box door structure, a slit for accommodating the first protrusion may be provided between the first movement limiting portion and the second movement limiting portion.

[0009] In the door structure for the box, a restriction structure including the first movement restriction portion and the second movement restriction portion sandwiching the slit may be provided at multiple locations spaced apart from each other in a third direction intersecting the first direction and the second direction.

[0010] The door structure for a box may include a protrusion portion integrally having the first protrusion and a second protrusion protruding from the second panel and having an engagement portion of the second inner engagement portion and the second outer engagement portion provided on the second panel.

[0011] The door structure for a box has a first side portion and a second side portion that are approximately parallel to each other, with the edge of the inner panel and the edge of the outer panel overlapping each other, and is rotatable around a rotation axis that is approximately parallel to the first side portion and the second side portion and is located closer to the first side portion than the second side portion, and the first engagement structure may be located closer to the longitudinal end portion than the longitudinal center of the second side portion. [Effects of the Invention]

[0012] According to the present invention, for example, it is possible to provide an improved new door structure for a box in which the engagement structure is less likely to be released from its engaged state. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is an exemplary schematic perspective view of an outer panel of a door structure according to an embodiment. [Figure 2] FIG. 2 is an exemplary schematic perspective view of an inner panel of the door structure according to the embodiment. [Figure 3] FIG. 3 is an exemplary schematic exploded perspective view of the inner panel of the door structure of the embodiment when viewed in the same direction as FIG. [Figure 4] FIG. 4 is an exemplary schematic perspective view of an inner portion of the first engagement structure of the door structure according to the embodiment, the inner portion being provided on the inner panel. [Figure 5]FIG. 5 is an exemplary schematic perspective view of an inner portion of the first engagement structure of the door structure according to the embodiment, which is provided on the inner panel, when viewed in a direction different from that of FIG. [Figure 6] FIG. 6 is an exemplary schematic perspective view of an outer portion of the first engagement structure of the door structure according to the embodiment, the outer portion being provided on the outer panel. [Figure 7] FIG. 7 is an exemplary schematic perspective view of an outer portion of the first engagement structure of the door structure according to the embodiment, which is provided on the outer panel, when viewed in a direction different from that of FIG. [Figure 8] FIG. 8 is an exemplary schematic perspective view showing a cross section of the first engagement structure of the door structure of the embodiment. [Figure 9] 9 is an exemplary schematic exploded perspective view of the first engagement structure shown in FIG. 8, taken along the same cross section as FIG. [Figure 10] FIG. 10 is an exemplary schematic perspective view showing a cross section of the first engagement structure shown in FIGS. 8 and 9, different from that of FIGS. [Figure 11] 11 is an exemplary schematic exploded perspective view of the first engagement structure shown in FIG. 10 taken along the same cross section as FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Exemplary embodiments of the present invention are disclosed below. The configurations of the embodiments described below, as well as the actions and results (effects) brought about by the configurations, are merely examples. The present invention can also be realized by configurations other than those disclosed in the following embodiments. Furthermore, according to the present invention, it is possible to obtain at least one of the various effects (including derivative effects) obtained by the configurations.

[0015] In this specification, ordinal numbers may be assigned for convenience to distinguish directions, parts, members, mechanisms, etc. Furthermore, ordinal numbers do not indicate priority or order, nor do they specify numbers.

[0016] In each drawing, the X direction is represented by an arrow X, the Y direction is represented by an arrow Y, and the Z direction is represented by an arrow Z. The X direction, Y direction, and Z direction intersect with each other and are perpendicular to each other.

[0017] [Door structure] 1 and 2 are perspective views of the door structure 10 as viewed from different directions. The door structure 10 can be applied to, for example, a door that covers a glove box provided in a vehicle.

[0018] 1 and 2, the door structure 10 has four sides 11a, 11b, 11c, and 11d and corners 12a, 12b, 12c, and 12d. Sides 11a and 11b have approximately the same length, are linear, and are approximately parallel to each other. Sides 11c and 11d are both curved, and have approximately the same projected shape in the direction in which sides 11a and 11b extend.

[0019] The door structure 10 is supported by a support member (not shown) so as to be rotatable around a rotation axis Ax. The rotation axis Ax is substantially parallel to the sides 11a and 11b and is located closer to the side 11a than the side 11b. The side 11a is an example of a first side, and the side 11b is an example of a second side.

[0020] Fig. 3 is an exploded perspective view of the door structure 10 as viewed in the same direction as Fig. 2. As shown in Figs. 1 to 3, the door structure 10 has a configuration in which a curved, plate-like inner panel 20 and an outer panel 30 are overlapped. Both the inner panel 20 and the outer panel 30 are curved into a cylindrical shape with a generatrix that is approximately parallel to the sides 11a and 11b. Both the inner panel 20 and the outer panel 30 are made of a synthetic resin material.

[0021] As shown in Fig. 2, the inner panel 20 has an inner surface 20a. The inner surface 20a faces the inside of the storage compartment of the box. As shown in Fig. 1, the outer panel 30 has an outer surface 30a. The outer surface 30a faces the outside of the storage compartment of the box.

[0022] As shown in Fig. 3, the inner panel 20 and the outer panel 30 are integrated by being engaged with each other by engaging structures 40A, 40B provided at multiple locations. Each of the engaging structures 40A, 40B has an inner portion 41 (see Figs. 4, 5, etc.) provided on the inner panel 20 and an outer portion 42 (see Figs. 3, 6, 7, etc.) provided on the outer panel 30, and the inner portion 41 and the outer portion 42 are engaged with each other in each of the engaging structures 40A, 40B. These engaging structures 40A, 40B restrict the inner panel 20 from moving away from the outer panel 30 in the X direction relative to the outer panel 30. The X direction is an example of a first direction.

[0023] The engagement structures 40A and 40B are primarily located near the sides 11a, 11b, 11c, and 11d or the corners 12a and 12b. Of these, the engagement structure 40A is located closer to the longitudinal end of the side 11b than the longitudinal center, i.e., closer to the corners 12a and 12b. In the door structure 10 of this embodiment, the areas near the corners 12a and 12b are more likely to be displaced between the inner panel 20 and the outer panel 30 than other areas. Therefore, a larger force is likely to act on the engagement structure 40A than on the other engagement structures 40B. In other words, the engagement structure 40A is more likely to disengage than the other engagement structures 40B. Therefore, in this embodiment, the engagement structure 40A located near the corners 12a and 12b is configured to be more difficult to disengage than the other engagement structures 40B. Details of this configuration will be described later. The engagement structure 40A is an example of a first engagement structure.

[0024] [Inner part of the engagement structure] 4 and 5 are perspective views of the inner portion 41 of the engagement structure 40A provided on the inner panel 20, as viewed from different directions. As shown in FIGS. 4 and 5, the inner portion 41 has a base 41a, a first inner engagement portion 51, a second inner engagement portion 61, and a movement limiting portion 70.

[0025] The base 41a protrudes in the opposite direction to the X direction from the back surface 20b opposite to the inner surface 20a (see FIG. 2) of the inner panel 20, and functions as a seat for the inner portion 41. The base 41a may also be referred to as a protrusion.

[0026] The base 41a has two ribs 41a1 and a beam-like portion 41c. The two ribs 41a1 each have a plate-like shape that intersects with the Z direction and are spaced apart from each other in the Z direction. In the engagement structure 40A, the Z direction is the direction in which the rotation axis Ax extends, but is not limited to this. The Z direction is an example of a third direction.

[0027] The beam-shaped portion 41c extends in the Z direction so as to bridge between the tops of the two ribs 41a1 that are on the opposite side in the X direction. An edge extending in the Z direction at the end of the beam-shaped portion 41c in the Y direction constitutes a first inner engagement portion 51, and an edge extending in the Z direction at the end of the beam-shaped portion 41c on the opposite side in the Y direction constitutes a second inner engagement portion 61. In the engagement structure 40A, the opposite direction in the Y direction is a direction that intersects with the rotation axis Ax, but is not limited to this.

[0028] An opening 41b that opens in the opposite direction to the X direction is provided at a position adjacent to the beam-shaped portion 41c in the opposite direction to the Y direction. When assembled with the outer panel 30, a protrusion 42d (see FIGS. 6, 7, and 9) provided on the outer panel 30 is inserted into the opening 41b.

[0029] The movement restricting portion 70 has two protrusions 71, 72 that protrude in opposite directions in the X direction. The protrusions 71, 72 each have a plate-like shape that intersects the Y direction and are aligned in the Z direction with a slit S sandwiched between them. The movement restricting portions 70, each having approximately the same shape, are aligned at intervals in the Y direction. The movement restricting portions 70 each protrude in opposite directions in the X direction from the apex of the rib 41a1 that is on the opposite side in the X direction. When assembled with the outer panel 30, protrusions 80 (see FIGS. 6, 7, and 9) provided on the outer panel 30 are inserted into the slits S. The movement restricting portions 70 are an example of a restriction structure.

[0030] In this way, by providing the first inner engagement portion 51, the second inner engagement portion 61, and the movement restricting portion 70 in the inner portion 41 on the base 41a, it is possible to obtain effects such as making the inner portion 41 more compact and increasing the rigidity of the inner portion 41.

[0031] [Outer part of engagement structure] 6 and 7 are perspective views, seen from different directions, of the outer region 42 of the engagement structure 40A provided on the outer panel 30. As shown in Figs. 6 and 7, the outer region 42 has a base 42a, a first outer engagement portion 52, a second outer engagement portion 62, and two protrusions 80.

[0032] The base a protrudes in the X direction from the rear surface 30b opposite to the outer surface 30a (see FIG. 1) of the outer panel 30, and functions as a seat for the outer portion .

[0033] The base 42a has two ribs 42a1 and a beam-like portion 42c. The two ribs 42a1 each have a plate-like shape that intersects with the Z direction and are spaced apart from each other in the Z direction. The base 42a may also be referred to as a protrusion.

[0034] The beam-shaped portion 42c extends in the Z direction so as to bridge between the tops of the two ribs 42a1 in the X direction. An edge extending in the Z direction at the end of the beam-shaped portion 42c in the Y direction forms the first outer engagement portion 52.

[0035] A protrusion 42d is provided as part of the base 42a at a position away from the beam-shaped portion 42c in the opposite direction in the Y direction, protruding from the rear surface 30b in the X direction. The protrusion 42d has a plate-like shape that intersects with the Y direction. Two protrusions 80 are provided at the base of the protrusion 42d so as to sandwich the protrusion 42d in the Z direction. Each of the protrusions 80 has a plate-like shape that intersects with the Y direction. The protrusion 42d and the two protrusions 80 form an integrated protrusion portion.

[0036] The protrusion 42d is provided with a second outer engagement portion 62 as a protrusion that protrudes in the Y direction. The protrusion 42d is an example of a second protrusion.

[0037] An opening 42b that is open in the X direction is provided between the beam-like portion 42c and the protrusions 42d, 80. When assembled with the outer panel 30, the protrusion 71 and the beam-like portion 41c (see FIGS. 4, 5, and 9) provided on the inner panel 20 are inserted into the opening 42b.

[0038] In this way, by providing the first outer engagement portion 52, the second outer engagement portion 62, the protrusion 42d, and the protrusion 80 in the outer portion 42 on the base 42a, it is possible to obtain effects such as making the outer portion 42 more compact and increasing the rigidity of the outer portion 42, for example.

[0039] [First snap-fit ​​mechanism] FIG. 8 is a perspective view of a cross section of the engagement structure 40A intersecting with the Z direction, and FIG. 9 is an exploded perspective view of the same cross section as FIG.

[0040] The first snap-fit ​​mechanism 50 has a first inner engagement portion 51 and a first outer engagement portion 52. As shown in FIG. 9 , when the inner panel 20 and the outer panel 30 approach each other in the mounting direction FD in the X direction, the first inner engagement portion 51 moves in the opposite direction of the X direction relative to the first outer engagement portion 52, abutting against the first outer engagement portion 52 and pressing the first outer engagement portion 52 in the Y direction. As a result, the first outer engagement portion 52 elastically deforms and moves from position P11 in the non-pressed state to position P12, which is shifted in the Y direction. As shown in FIG. 8 , when the inner panel 20 is further pressed in the opposite direction of the X direction relative to the outer panel 30, the first outer engagement portion 52 returns from position P12 to position P11. In this state, the first inner engagement portion 51 is adjacent to the first outer engagement portion 52 in the opposite direction to the X direction, and an engagement state is obtained in which the first inner engagement portion 51 and the first outer engagement portion 52 are engaged in the X direction. The first snap-fit ​​mechanism 50 restricts the first inner engagement portion 51, and therefore the inner panel 20, from moving away in the X direction relative to the first outer engagement portion 52, and therefore the outer panel 30.

[0041] In the first snap-fit ​​mechanism 50, there is a risk that the engagement will be released if a relative shear force acts in the Y direction between the inner panel 20 and the outer panel 30. In this embodiment, when the first outer engagement portion 52 moves in the Y direction relative to the first inner engagement portion 51, in other words, when the first inner engagement portion 51 moves in the opposite direction of the Y direction relative to the first outer engagement portion 52, there is a risk that the engagement state of the first snap-fit ​​mechanism 50 will be released.

[0042] Therefore, in this embodiment, the disengagement of the first snap-fit ​​mechanism 50 is restricted by the abutment between the protrusion 80 provided on the outer panel 30 and the protrusion 71 provided on the inner panel 20. That is, the protrusion 71 provided on the inner panel 20 is adjacent to the protrusion 80 provided on the outer panel 30 in the Y direction, restricting the protrusion 80 and therefore the outer panel 30 from moving in the Y direction relative to the inner panel 20. This configuration makes it difficult for the engagement state of the first snap-fit ​​mechanism 50 to be released. In this configuration, the protrusion 80 is an example of a first protrusion, the outer panel 30 on which the protrusion 80 is provided is an example of a first panel, the protrusion 71 is an example of a first movement restricting portion, the inner panel 20 on which the protrusion 71 is provided is an example of a second panel, and the Y direction is an example of a second direction.

[0043] [Second snap-fit ​​mechanism] 10 is a perspective view of the engagement structure 40A in a cross section intersecting the Z direction different from those in FIGS. 8 and 9, and FIG. 11 is an exploded perspective view in the same cross section as FIG.

[0044] The second snap-fit ​​mechanism 60 has a second inner engagement portion 61 and a second outer engagement portion 62. As shown in FIG. 11 , when the inner panel 20 and the outer panel 30 approach each other in the mounting direction FD in the X direction, the second inner engagement portion 61 moves in the opposite direction of the X direction relative to the second outer engagement portion 62, abuts against the second outer engagement portion 62, and presses the second outer engagement portion 62 in the opposite direction of the Y direction. As a result, the protrusion 42d having the second outer engagement portion 62 elastically deforms, and the second outer engagement portion 62 moves from position P21 in the non-pressed state to position P22, which is shifted in the opposite direction of the Y direction. As shown in FIG. 10 , when the inner panel 20 is further pressed in the opposite direction of the X direction relative to the outer panel 30, the second outer engagement portion 62 returns from position P22 to position P21. In this state, the second inner engagement portion 61 is adjacent to the second outer engagement portion 62 in the opposite direction to the X direction, and an engagement state is obtained in which the second inner engagement portion 61 and the second outer engagement portion 62 are engaged in the X direction. Similar to the first snap-fit ​​mechanism 50, the second snap-fit ​​mechanism 60 also restricts the second inner engagement portion 61, and therefore the inner panel 20, from moving away in the X direction relative to the second outer engagement portion 62, and therefore the outer panel 30.

[0045] In the second snap-fit ​​mechanism 60, as in the first snap-fit ​​mechanism 50, there is a risk that the engagement will be released when a relative shear force acts in the Y direction between the inner panel 20 and the outer panel 30. In this embodiment, when the second outer engagement portion 62 moves in the opposite direction of the Y direction relative to the second inner engagement portion 61, in other words, when the second inner engagement portion 61 moves in the Y direction relative to the second outer engagement portion 62, there is a risk that the engagement state of the second snap-fit ​​mechanism 60 will be released.

[0046] 8 , in this embodiment, the disengagement of the second snap-fit ​​mechanism 60 is restricted by the abutment between the protrusion 80 provided on the outer panel 30 and the protrusion 72 provided on the inner panel 20. That is, the protrusion 72 provided on the inner panel 20 is adjacent to the protrusion 80 provided on the outer panel 30 in the opposite Y direction, restricting the protrusion 80 and therefore the outer panel 30 from moving in the opposite Y direction relative to the inner panel 20. This configuration makes it difficult for the engagement state of the second snap-fit ​​mechanism 60 to be released. In this configuration, the protrusion 80 is an example of a second protrusion, the outer panel 30 on which the protrusion 80 is provided is an example of a first panel, the protrusion 72 is an example of a second movement restricting portion, the inner panel 20 on which the protrusion 72 is provided is an example of a second panel, and the Y direction is an example of a second direction.

[0047] 5, in this embodiment, the protrusions 71 and 72 that constitute the movement restricting portion 70 are aligned in the Y direction with the slit S therebetween. In other words, the slit S that accommodates the protrusion 80 is provided between the protrusions 71 and 72. With this configuration, the protrusion 80 can be shared by the protrusions 71 and 72 as the object of movement restriction therebetween, which provides the effect of further simplifying the configuration compared to when the object of movement restriction by the protrusion 71 and the object of movement restriction by the protrusion 72 are provided separately.

[0048] 5, in this embodiment, the movement limiting portions 70 each having the protrusion 71 and the protrusion 72 are provided at multiple locations (two locations in this embodiment, for example) spaced apart in the Z direction, which intersects the X and Y directions. This configuration can suppress relative rotation around the X axis between the inner portion 41 and the outer portion 42 of the engagement structure 40A, thereby suppressing relative twisting around the X axis between the inner portion 41 and the outer portion 42. Consequently, it is more difficult for the first snap-fit ​​mechanism 50 and the second snap-fit ​​mechanism 60 to be disengaged. In this case, the multiple movement limiting portions 70 are preferably provided in the Z direction so as to sandwich a central portion of the first snap-fit ​​mechanism 50 in the Z direction and to sandwich a central portion of the second snap-fit ​​mechanism 60 in the Z direction. While the number of movement limiting portions 70 is two in this embodiment, for example, it may be three or more.

[0049] 7, 9, etc., in this embodiment, protrusion 42d and protrusion 80 form an integrated protrusion portion. With this configuration, compared to when protrusion 42d and protrusion 80 are configured separately, engagement structure 40A can be configured more compactly, and the rigidity of protrusion 42d and protrusion 80 can be increased, thereby more reliably achieving the movement restriction effect and ultimately making it more difficult for the engagement state formed by engagement structure 40A to be released.

[0050] Furthermore, in the engagement structure 40A, the disengagement direction of the first snap-fit ​​mechanism 50 and the disengagement direction of the second snap-fit ​​mechanism 60 are opposite to each other. That is, as can be seen from FIG. 10 , when the outer panel 30 moves in the Y direction relative to the inner panel 20, the first snap-fit ​​mechanism 50 is easily disengaged, whereas the second snap-fit ​​mechanism 60 is difficult to disengage. Conversely, when the outer panel 30 moves in the opposite direction of the Y direction relative to the inner panel 20, the first snap-fit ​​mechanism 50 is difficult to disengage, whereas the second snap-fit ​​mechanism 60 is easily disengaged. Therefore, according to the engagement structure 40A of this embodiment, the configuration including the first snap-fit ​​mechanism 50 and the second snap-fit ​​mechanism 60 not only provides the effect of multiplexing the engagement structure but also provides the effect of mutual complementarity in terms of disengagement.

[0051] It should be noted that, compared to engagement structure 40A, engagement structure 40B can be configured without at least one of the restriction of movement of protrusion 80 by protrusion 71 and the restriction of movement of protrusion 80 by protrusion 72. Specifically, for example, each engagement structure 40B can be configured without at least one of protrusion 71 and protrusion 72, or without protrusions 71, 72, and 80, but otherwise be the same structure as engagement structure 40A. This can result in, for example, a simpler configuration for engagement structure 40B, which can result in effects such as reduced effort and cost required for manufacturing and a lighter or more compact configuration.

[0052] As described above, in this embodiment, the movement of the protrusion 80 (first protrusion) in the Y direction (second direction) is restricted by the protrusion 71 (first movement restricting portion). This configuration provides the effect that, for example, the engagement of the first snap-fit ​​mechanism 50 becomes difficult to release.

[0053] In this embodiment, the protrusion 72 (second movement limiting portion) limits the movement of the protrusion 80 in the opposite direction to the Y direction (the opposite direction to the second direction). This configuration has the effect of making it difficult for the second snap fit mechanism 60 to be disengaged, for example.

[0054] In addition, in this embodiment, a slit S that accommodates the protrusion 80 is provided between the protrusion 71 and the protrusion 72. This configuration has the effect of further simplifying the configuration that includes the protrusion 71 and the protrusion 72, for example.

[0055] In this embodiment, the movement restricting portions 70 (restricting structures) are provided at multiple locations spaced apart from one another in the Z direction (third direction). This configuration, for example, can suppress relative twisting of the engaging structure 40A around the X axis, thereby making it even more difficult for the first snap-fit ​​mechanism 50 and the second snap-fit ​​mechanism 60 to be disengaged.

[0056] Furthermore, in this embodiment, a protrusion portion is provided in which the protrusion 42d (second protrusion) and the protrusion 80 (first protrusion) are integrated together. With this configuration, for example, the rigidity of the protrusions 42d, 80 can be increased, and the movement restriction effect of the protrusions 42d, 80 can be more reliably obtained, thereby obtaining the effect that the engagement of the first snap-fit ​​mechanism 50 and the second snap-fit ​​mechanism 60 becomes even more difficult to release.

[0057] Furthermore, in this embodiment, the engagement structure 40A (first engagement structure), which makes it more difficult for the engagement between the first snap-fit ​​mechanism 50 and the second snap-fit ​​mechanism 60 to be released, is provided closer to the longitudinal end of the side 11b (second side) than to the longitudinal center. This configuration has the effect of making it even more difficult for the engagement structure 40A to be released more reliably, for example, in locations where the relative movement between the inner panel 20 and the outer panel 30 is greater.

[0058] While the embodiments of the present invention have been described above, they are merely examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the spirit of the invention. Furthermore, the specifications of each configuration, shape, and the like (structure, type, direction, model, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be modified as appropriate.

[0059] For example, the first protrusion may be provided on the inner panel, and the first movement limiting portion and the second movement limiting portion may be provided on the outer panel.

[0060] The second direction and the third direction can be set in various ways relative to the first direction. [Explanation of symbols]

[0061] 10...Door structure 11a...Side part (first side part) 11b...Side part (second side part) 11c,11d…side part 12a~12d…corner 20...Inner panel (second panel or first panel) 20a...inner surface 20b…Back side 30...Outer panel (first panel or second panel) 30a…Outer surface 30b…Back side 40A…Engagement structure (first engagement structure) 40B…Engagement structure 41...Inner part 41a...bass 41a1...Rib 41b…Aperture 41c...beam-like part 42...Outer part 42a...bass 42a1...Rib 42b…Aperture 42c…beam-like part 42d...Protrusion (second protrusion, protrusion) 50...First snap fit mechanism 51...First inner engaging portion 52...First outer engaging portion 60...Second snap fit mechanism 61...Second inner engaging portion 62...Second outer engaging portion 70...Movement restriction section (restriction structure) 71...Protrusion (first movement limiting portion) 72...Protrusion (second movement limiting portion) 80...Protrusion (first protrusion, protrusion) Ax...rotation axis P11,P12,P21,P22…Position S...slit X…direction (first direction) Y…direction (second direction) Z…direction (third direction)

Claims

1. A door structure for a box, comprising an inner panel, an outer panel, and an engagement structure that engages and integrates the inner panel and the outer panel at a plurality of locations, The first engagement structure, which is at least one of the engagement structures, a first snap-fit ​​mechanism including a first inner engagement portion provided on the inner panel and a first outer engagement portion provided on the outer panel and engaging with the first inner engagement portion, the first snap-fit ​​mechanism restricting separation of the inner panel in a first direction relative to the outer panel by engagement between the first inner engagement portion and the first outer engagement portion; a first protrusion provided on a first panel that is one of the inner panel and the outer panel and protruding from the first panel toward a second panel that is the other of the inner panel and the outer panel; a first movement limiting portion provided on the second panel, which limits movement of the first protrusion relative to the second panel in a second direction that intersects with the first direction and in which the first inner engaging portion and the first outer engaging portion move away from each other to release the engagement of the first snap-fit ​​mechanism; A door structure for a box having the same.

2. The first engagement structure is a second snap-fit ​​mechanism having a second inner engagement portion provided on the inner panel and a second outer engagement portion provided on the outer panel and engaging with the second inner engagement portion, wherein engagement between the second inner engagement portion and the second outer engagement portion restricts movement of the inner panel relative to the outer panel in the first direction, and when the first panel moves relative to the second panel in a direction opposite to the second direction, the engagement between the second inner engagement portion and the second outer engagement portion is released; a second movement limiting portion provided on the second panel and configured to limit movement of the first protrusion relative to the second panel in a direction opposite to the second direction; The door structure for a box according to claim 1, comprising:

3. The door structure for a box according to claim 2 , wherein a slit for accommodating the first protrusion is provided between the first movement limiting portion and the second movement limiting portion.

4. 4. The door structure for a box as described in claim 3, wherein a restriction structure including the first movement restriction portion and the second movement restriction portion sandwiching the slit is provided at multiple locations spaced apart from each other in a third direction intersecting the first direction and the second direction.

5. A door structure for a box as described in any one of claims 2 to 4, comprising a protrusion portion integrally having a second protrusion protruding from the second panel and having an engagement portion of the second inner engagement portion and the second outer engagement portion provided on the second panel, and the first protrusion.

6. The edge of the inner panel and the edge of the outer panel overlap each other to form a first side portion and a second side portion that are substantially parallel to each other, the first side portion and the second side portion are provided so as to be rotatable about a rotation axis that is substantially parallel to the first side portion and the second side portion and is located closer to the first side portion than the second side portion; The door structure for a box according to claim 1 , wherein the first engagement structure is located closer to an end of the second side portion in the longitudinal direction than to a center of the second side portion in the longitudinal direction.

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