Handle structure and packaging box

Abstract

To achieve both simplification of a structure of a handle and stabilization of a posture in use in the structure of the handle.SOLUTION: A handle structure 20 includes a mounting surface 12 formed with an insertion hole 11, and a handle 1 formed of a single foldable sheet material. The handle 1 includes: a strip-shaped main body piece 2 extending in a longitudinal direction D1, and a locking piece 3 which is continuous with an end portion 21 of the main body piece 2 in the longitudinal direction D1 and has a shape bulging out from the main body piece 2 to both sides in a short direction D2. When the handle 1 is in use of being attached to the mounting surface 12, the locking piece 3 is arranged inside the mounting surface 12, and the main body piece 2 bent from the locking piece 3 at the end 21 in the longitudinal direction D1 is arranged outside the mounting surface 12 through the insertion hole 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a handle structure having a knob attached to an attachment surface and a packaging box equipped with this handle structure. [Background technology]

[0002] Conventionally, handles that are attached to the top surface of a box are known. For example, Patent Document 1 discloses a handle in which both ends of a paper strip are folded back and sewn together to form a sealed portion. This handle is structured so that both ends are inserted into two holes formed in the top surface (upper wall) of a paper box, and the sealed portion is hooked on the inside of the top surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-289425 A Summary of the Invention [Problem to be solved by the invention]

[0004] The handle described in Patent Document 1 requires folding and sewing both ends of a paper strip, so it is not easy to manufacture, and the folding of both ends makes the handle thicker, which may reduce storage stability. On the other hand, if the handle is formed from a single sheet material without sewing both ends, the structure can be simplified and storage stability can be improved, but with such a simple structure, it is difficult to prevent both ends inserted into the insertion holes from falling out. For this reason, there is a risk that the handle's posture will become unstable when it is attached to the mounting surface and in use. Therefore, the conventional handle structure in which the handle is attached to the mounting surface has room for improvement in terms of both simplifying the handle's structure and stabilizing its posture when in use.

[0005] The present invention was invented in consideration of the above problems, and one of the objectives of the present invention is to achieve both a simplified handle structure and a stable posture when in use. However, in addition to this objective, another objective of the present invention is to achieve actions and effects derived from each configuration shown in the "Mode for Carrying Out the Invention" described later, which are actions and effects that cannot be obtained with conventional technology. [Means for solving the problem]

[0006] The handle structure in this case comprises a mounting surface having an insertion hole formed therein, a band-shaped main body piece extending in the longitudinal direction, and a locking piece connected to the longitudinal end of the main body piece, having a shape that bulges out on both sides of the main body piece in the short direction, and including a tip portion positioned outside the end of the main body piece in the longitudinal direction and a pair of side portions positioned inside the end of the main body piece in the longitudinal direction and separated from the main body piece by a slit, the handle being formed from a single foldable sheet material, and in a use state attached to the mounting surface, the locking piece is positioned on the inside of the mounting surface, and the main body piece folded at the end from the locking piece is positioned on the outside of the mounting surface through the insertion hole. The packaging box of the present invention includes the handle structure and a box body that is a hexahedron with the mounting surface as the upper surface. Effect of the Invention

[0007] According to this embodiment, it is possible to achieve both a simplified handle structure and a stable posture when in use. [Brief description of the drawings]

[0008] [Figure 1] FIG. [Diagram 2] This is a plan view (developed view) of the handle. [Diagram 3] 4 is a schematic diagram showing the periphery of an insertion hole on the mounting surface. FIG. [Figure 4]10A and 10B are cross-sectional views illustrating the procedure for attaching a handle to a mounting surface, in which (a) shows the state in which the locking piece of the handle is in the middle of being inserted into the insertion hole, and (b) shows the state in which the locking piece of the handle is locked onto the mounting surface. [Diagram 5] FIG. 4 is a plan view (developed view) of a blank sheet to be assembled into a box body. [Figure 6] 13(a) and 13(b) are perspective views for explaining an assembly procedure for the box body. [Figure 7] 13(a) to 13(c) are perspective views illustrating an assembly procedure for the box. [Figure 8] 1 is a cross-sectional view showing a main part (handle in use) of a packaging box. [Figure 9] 1 is a plan view illustrating a main part of a handle having a hole. FIG. [Figure 10] 13 is a plan view illustrating a main part of a handle having an auxiliary slit. FIG. [Figure 11] 1 is a plan view illustrating an example of a main part of a handle equipped with a locking reinforcement piece and a main body reinforcement piece. [Figure 12] 12 is a cross-sectional view showing a main part of the handle of FIG. 11 in use. FIG. [Figure 13] 1 is a plan view illustrating an example of a main part of a handle having a locking reinforcement piece and a notch. FIG. [Figure 14] FIG. 14 is a cross-sectional view showing a main part of the handle of FIG. 13 in a used state. [Figure 15] FIG. 13 is a plan view of a mounting surface to which a handle according to one modified example is applied. [Figure 16] FIG. 11 is a perspective view showing a mounting surface according to a first modified example together with a main part of a handle. [Figure 17] 17 is a cross-sectional view showing a state in which a handle is attached to the attachment surface of FIG. 16 in use. FIG. [Figure 18] FIG. 11 is a perspective view showing a mounting surface according to a second modified example together with a main part of the handle. [Figure 19] 19 is a cross-sectional view showing a state in which a handle is attached to the attachment surface of FIG. 18 in use. FIG. [Figure 20] FIG. 11 is a perspective view showing a mounting surface according to a third modified example together with a main part of a handle. [Figure 21]21 is a cross-sectional view showing a state in which a handle is attached to the attachment surface of FIG. 20 in use. FIG. [Figure 22] Each of (a) to (c) is a schematic diagram of an insertion hole according to one modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and are not intended to exclude the application of various modifications and techniques not specified in the embodiments. The configurations of the following embodiments can be modified in various ways without departing from the spirit of the embodiments. In addition, they can be selected or combined as necessary.

[0010] [1. Configuration] As shown in Fig. 1, the handle structure 20 according to this embodiment includes an attachment surface 12 having an insertion hole 11 formed therein, and a handle 1 formed from a single foldable sheet material. The packaging box 30 according to this embodiment includes the handle structure 20 and a box body 10 that is a hexahedron with the attachment surface 12 as the upper surface. Hereinafter, the state in which the handle 1 is attached to the attachment surface 12 is referred to as the "used state." Note that Fig. 1 shows the box body 10 in a schematic manner.

[0011] <Handle> 2, the handle 1 includes a strip-shaped main body piece 2 extending in the longitudinal direction D1, and a locking piece 3 connected to an end 21 in the longitudinal direction D1 of the main body piece 2. In this embodiment, a handle 1 including a pair of locking pieces 3 connected to both end parts 21 in the longitudinal direction D1 of the main body piece 2 is illustrated.

[0012] Hereinafter, the direction perpendicular to the longitudinal direction D1 in the extending surface of the sheet material forming the handle 1 is also referred to as the "short direction D2". In addition, the side toward the center (center line C1) of the handle 1 in the longitudinal direction D1 is also referred to as the "inner side", and the opposite side (the side away from the center line C1) is also referred to as the "outer side". In the plan view shown in FIG. 2, the handle 1 of this embodiment has a shape that is symmetrical with respect to the center line C1 of the longitudinal direction D1 and also with respect to the center line C2 of the short direction D2. However, the handle 1 may have an asymmetric shape with respect to the center lines C1 and C2, and for example, the pair of locking pieces 3 may have different structures. Here, an example is shown in which the sheet material forming the handle 1 has a predetermined thickness dimension T (see FIG. 1).

[0013] The main body piece 2 is a handle portion that is gripped by a user. In this embodiment, the main body piece 2 has a rectangular shape that is longer in the longitudinal direction D1 than in the lateral direction D2. As described above, the end portion 21 of the main body piece 2 in the longitudinal direction D1 is connected to the locking piece 3, while the end portion 22 in the lateral direction D2 is not connected to the locking piece 3.

[0014] Hereinafter, each end 21 in the longitudinal direction D1 of the main body piece 2 is also referred to as a "connecting end 21," and each end 22 in the lateral direction D2 of the main body piece 2 is also referred to as a "longitudinal edge 22." The connecting end 21 may be provided with a groove (ruled line) or perforations for guiding folding. Here, an example is shown in which a ruled line extending along the lateral direction D2 is provided in two places, the connecting end 21 and a position adjacent to the inside of the connecting end 21 in the longitudinal direction D1.

[0015] In this embodiment, each longitudinal edge 22 extends linearly along the longitudinal direction D1. Each longitudinal edge 22 includes an opposing edge 23 adjacent to a part of the locking piece 3 (a side portion 32 described later) in the lateral direction D2, and an intermediate edge 24 extending between the pair of locking pieces 3 and not adjacent to any part of the handle 1. In this embodiment, the dimension of the main body piece 2 in the lateral direction D2 is uniform throughout the longitudinal direction D1. That is, the dimension W2 between the opposing edges 23 (the dimension along the lateral direction D2) is equal to the dimension between the intermediate edges 24.

[0016] The main body piece 2 of the present embodiment has creases 25 extending in a direction intersecting the longitudinal direction D1 between the intermediate edges 24. The creases 25 guide the bending of the main body piece 2 when in use. Here, a main body piece 2 is exemplified in which a plurality of creases 25 extending along the short direction D2 (a direction perpendicular to the longitudinal direction D1) are arranged at equal intervals in the longitudinal direction D1. It is preferable that main body piece 2 has creases 25 as described above, because creases 25 guide bending of main body piece 2, making main body piece 2 more comfortable to the hand of a user holding main body piece 2. However, main body piece 2 does not have to have creases 25. Note that in Fig. 2, only one of the multiple creases 25 is marked with a reference symbol.

[0017] The locking piece 3 is a fixing part for attaching the handle 1 to the attachment surface 12. The locking piece 3 has a shape that bulges out on both sides in the short direction D2 more than the main body piece 2. More specifically, the maximum dimension W3 of the locking piece 3 in the short direction D2 is set to be larger than the dimension W2 between the opposing edges 23 of the main body piece 2 (W3>W2). Here, a generally rectangular locking piece 3 is exemplified, with the outer end in the longitudinal direction D1 rounded to form a semicircular shape.

[0018] The locking piece 3 has a tip portion 31 disposed outside the connecting end portion 21 of the main body piece 2 in the longitudinal direction D1, and a pair of side portions 32 disposed inside the connecting end portion 21 of the main body piece 2 in the longitudinal direction D1 and separated from the main body piece 2 by a slit 4. In this manner, the tip portion 31 and the side portions 32 are disposed on both sides of the connecting end portion 21 in the longitudinal direction D1.

[0019] The tip portion 31 is connected to the connecting end portion 21 of the main body piece 2. In this embodiment, each tip portion 31 has a tapered shape in which the dimension in the short direction D2 gradually decreases toward the outside in the longitudinal direction D1. The side portion 32 is continuous with the tip portion 31. The side portion 32 is adjacent to the opposing edge portion 23 of the main body piece 2 in the short direction D2, but is separated from the opposing edge portion 23 of the main body piece 2 by a slit 4. The slit 4 is cut in a straight line along the longitudinal direction D1 corresponding to the opposing edge portion 23.

[0020] In the handle 1 of this embodiment, the main body piece 2 and the locking piece 3 as a whole have a single-layer structure (one sheet-like shape) when in use. In other words, when in use, neither the main body piece 2 nor the locking piece 3 is overlapped with other parts of the handle 1, and the entire handle 1 remains in a single-layer structure. The sheet material applied to the handle 1 is formed from a material that has strength and rigidity sufficient to withstand the load acting on the handle 1 in use (the weight of the box 10 and its contents), and allows the main body piece 2 to bend to an extent that a gap for the user's hand can be secured between the mounting surface 12 and the sheet. Examples of such sheet material include paper or resin sheets and laminates of these sheets, and preferably paper sheets such as paperboard, interleaving paper (paper sheets laminated with paper or paperboard), and low-fluted cardboard such as F-flute or G-flute. The basis weight of the paper sheet applied to the sheet material is preferably 300 g / m 2 More preferably, 400 g / m 2 That's all.

[0021] <Mounting surface> As shown in FIG. 1, in this embodiment, the mounting surface 12 forming the upper surface (top surface) of the box body 10 is illustrated. In the box body 10 in which the mounting surface 12 forms the upper surface, the outside of the mounting surface 12 corresponds to the upper side (the outside of the box body 10), and the inside of the mounting surface 12 corresponds to the lower side (the inside of the box body 10). The outside and inside of the mounting surface 12 here correspond to one side and the other side in the thickness direction of the mounting surface 12. In the following description, the outside (one side) of the mounting surface 12 is also referred to as the "upper side of the mounting surface 12", and the inside (other side) of the mounting surface 12 is also referred to as the "lower side of the mounting surface 12". The handle 1 is attached to the mounting surface 12 so that the main body piece 2 is arranged on the upper side of the mounting surface 12, and the locking piece 3 is arranged on the lower side of the mounting surface 12.

[0022] On the mounting surface 12 of the present embodiment, a pair of insertion holes 11 are provided so as to be spaced apart from each other. The pair of insertion holes 11 have symmetrical shapes with respect to each other. Hereinafter, among the directions along the mounting surface 12, the direction in which the pair of insertion holes 11 are spaced apart from each other is also referred to as the length direction DL, and the direction orthogonal to the length direction DL is also referred to as the width direction DW. Further, the dimension in the length direction DL is abbreviated as the "length dimension", and the dimension in the width direction DW is abbreviated as the "width dimension". Furthermore, on the mounting surface 12, the first side Da corresponding to the outside in the longitudinal direction D1 of the handle 1 in the use state is also referred to as the "outer side Da in the length direction", and the second side Db corresponding to the inside in the longitudinal direction D1 of the handle 1 in the use state is also referred to as the "inner side Db in the length direction".

[0023] The handle 1 is attached to the mounting surface 12 in a posture in which its longitudinal direction D1 coincides with the length direction DL and its short-side direction D2 coincides with the width direction DW. The dimension La between the pair of insertion holes 11 on the mounting surface 12 is set to be shorter than the dimension L2 (the dimension between the connection end portions 21) in the longitudinal direction D1 of the main body piece 2 (La < L2).

[0024] The shape and size of the insertion hole 11 are set according to the shape and size of the handle 1. As shown in FIG. 3, the insertion hole 11 of the present embodiment has a wide portion 33 through which the locking piece 3 can be inserted, and a narrow portion 34 provided adjacent to the wide portion 33 through which the main body piece 2 in the use state is passed. Here, the wide portion 33 and the narrow portion 34, both of which are rectangular, are exemplified. The narrow portion 34 is arranged on the inner side Db in the length direction (lower side in FIG. 3) with respect to the wide portion 33. However, the narrow portion 34 may be arranged on the outer side Da in the length direction (upper side in FIG. 3) with respect to the wide portion 33.

[0025] The width dimension Ww of the wide portion 33 is set to be larger than the maximum dimension W3 in the short-side direction D2 of the locking piece 3 so that the locking piece 3 can be inserted therethrough (Ww > W3). On the other hand, the narrow portion 34 is formed to have a width dimension smaller than that of the wide portion 33 in order to suppress rattling (play) of the main body piece 2 in the use state. In other words, the width dimension Wn of the narrow portion 34 is set to be smaller than the width dimension Ww of the wide portion 33 (Wn < Ww).

[0026] The width dimension Wn of the narrow portion 34 in the present embodiment is set to be smaller than the maximum dimension W3 in the short-side direction D2 of the locking piece 3 and larger than the dimension W2 between the opposing edge portions 23 of the main body piece 2 (W2 < Wn < W3). Further, in the present embodiment, both the length dimension Lw of the wide portion 33 and the length dimension Ln of the narrow portion 34 are set to be larger than the thickness dimension T (see FIG. 1) of the sheet material forming the handle 1 (Lw > T and Ln > T).

[0027] The mounting surface 12 of the present embodiment has a wide flap 15 that covers at least a part of the wide portion 33. Here, an example of the wide flap 15 having the same shape as the wide portion 33 and covering the entire wide portion 33 is illustrated. The wide flap 15 has a main body portion 15a having a shape corresponding to the wide portion 33 and a base portion 15b extending in the width direction DW and serving as a swing axis of the main body portion 15a. The main body portion 15a is located on the inner side Db in the length direction (the narrow portion 34 side) with respect to the base portion 15b and is swingable around the base portion 15b. FIG. 3 shows the wide flap 15 in a state of covering the wide portion 33. Note that the base portion 15b may be provided with grooves (ruled lines) or perforations for guiding bending. Further, the wide flap 15 may be formed smaller than the wide portion 33 and may cover only a part of the wide portion 33.

[0028] The wide portion 33 is exposed as the main body portion 15a of the wide flap 15 swings (bends at the base portion 15b). For example, as shown in FIG. 1, when the wide flap 15 is rolled up to the upper side of the mounting surface 12, the wide portion 33 is exposed and the locking piece 3 can be inserted therethrough. On the other hand, since the narrow portion 34 of the present embodiment is not covered with a flap, it is always exposed.

[0029] As shown in FIG. 4(a), when the handle 1 is attached to the mounting surface 12, first, one locking piece 3 is inserted into the wide portion 33 of one insertion hole 11. At this time, the handle 1 is adjusted in orientation so that the short-side direction D2 coincides with the width direction WD of the mounting surface 12, and then the locking piece 3 is inserted from the tip portion 31 of the locking piece 3 into the wide portion 33 where the wide flap 15 is rolled up and exposed, for example, to the upper side of the mounting surface 12. Since the maximum dimension W3 in the short-side direction D2 of the locking piece 3 is smaller than the width dimension Ww of the wide portion 33 as described above, the locking piece 3 can be inserted to the lower side of the mounting surface 12 through the wide portion 33.

[0030] As shown in FIG. 4(b), the locking piece 3 is inserted entirely below the mounting surface 12, and then placed in a state overlapping the lower side of the mounting surface 12. The handle 1 is shifted inward in the longitudinal direction Db so that the main body piece 2 is placed in the narrow portion 34. The main body piece 2 is then bent upward from the locking piece 3 at the connecting end 21, and placed in a state of being pulled out to the upper side of the mounting surface 12 through the narrow portion 34. At this time, since the dimension W2 between the opposing edges 23 is smaller than the width dimension Wn of the narrow portion 34 as described above, the main body piece 2 is passed through the narrow portion 34 without being forcibly bent in the short direction D2. After the main body piece 2 is placed in the narrow portion 34 in this way, the wide flap 15 is returned to a state of covering the wide portion 33.

[0031] The above completes the attachment of one of the locking pieces 3 to the mounting surface 12. Similarly, the other locking piece 3 is inserted into the wide portion 33 of the other insertion hole 11 and then attached to the mounting surface 12. Then, when both of the pair of locking pieces 3 are attached to the mounting surface 12, the attachment of the handle 1 to the mounting surface 12 is completed. Note that in Figs. 4(a) and 4(b), only the handle 1 and the mounting surface 12 are shown, and other structures of the box body 10 are omitted. In addition, in the above description, an example in which one of the locking pieces 3 is inserted into the insertion hole 11 from the upper side of the mounting surface 12 has been shown, but instead, the other locking piece 3 and the main body piece 2 may be inserted into the insertion hole 11 from the lower side of the mounting surface 12, so that one of the locking pieces 3 is disposed on the lower side of the mounting surface 12. In addition, when inserting the locking piece 3 into the wide portion 33, the wide portion 33 may be exposed by pushing the wide flap 15 downwardly to the lower side of the mounting surface 12.

[0032] In the use state in which the handle 1 is attached to the mounting surface 12 as described above, the wide flap 15 covers the wide portion 33 of the insertion hole 11, and the main body piece 2 is disposed in the narrow portion 34 of the insertion hole 11. In such a use state, since the maximum dimension W3 in the short direction D2 of the locking piece 3 is greater than the width dimension Wn of the narrow portion 34 as described above, even if a tensile force is applied in the upward direction (toward the outside of the mounting surface 12), the locking piece 3 is caught around the narrow portion 34 on the mounting surface 12, and is prevented from coming out of the insertion hole 11. In addition, since the main body piece 2 is disposed in the narrow portion 34, which has a width dimension smaller than the wide portion 33, rattling is suppressed compared to when the main body piece 2 is disposed in the wide portion 33.

[0033] <Box body> The box 10 of this embodiment is assembled from one blank sheet 1S shown in Fig. 5. Here, a blank sheet 1S assembled into a so-called N-type box 10 is illustrated as an example. Hereinafter, the two directions perpendicular to each other along the extending surface of the blank sheet 1S are referred to as the longitudinal direction Dy and the transverse direction Dx. In the blank sheet 1S, the mounting surface 12 is provided in an orientation in which the length direction DL coincides with the longitudinal direction Dy and the width direction Dw coincides with the transverse direction Dx.

[0034] The blank sheet 1S is provided with a bottom surface 1a, a pair of long side surfaces 1b, 1c, and a pair of short side surfaces 1d, 1d, which together with the mounting surface 12 form a hexahedron in the box body 10. In the box body 10, the mounting surface 12 and the bottom surface 1a face each other, the pair of long side surfaces 1b, 1c also face each other, and the pair of short side surfaces 1d, 1d also face each other. The pair of long side surfaces 1b, 1c are specifically divided into a bottom side surface 1b that serves as the bottom surface and a lid side surface 1c that serves as the lid surface when contents (articles) are stored in the box body 10. In the blank sheet 1S, the lid side surface 1c, the lower surface 1a, the bottom side surface 1b, and the mounting surface 12 are connected in this order from one side to the other side in the lateral direction Dx (from the left side to the right side in FIG. 5).

[0035] In this embodiment, the outer overlapping surface 1f is connected to one side (left side in FIG. 5) of the lid side surface 1c in the horizontal direction Dx, and the inner overlapping surface 1g is connected to the other side (right side in FIG. 5) of the mounting surface 12 in the horizontal direction Dx. In the box 10 arranged in a position in which the mounting surface 12 is located higher than the lower surface 1a, the outer overlapping surface 1f is folded over the upper side of the mounting surface 12, and the inner overlapping surface 1g is folded over the lower side of the mounting surface 12. A band-shaped through hole 1h is formed on the outer overlapping surface 1f for pulling the main body piece 2 of the handle 1 in use outward from the box body 10. The shape, size and arrangement of the through hole 1h are set so that it overlaps at least the narrow portion 34 of the insertion piece 11 in the box body 10.

[0036] The pair of short side surfaces 1d, 1d are connected to both sides of the bottom side surface 1b in the vertical direction Dy. Furthermore, a side overlapping surface 1j having approximately the same shape as the short side surface 1d is connected to the outer side of each short side surface 1d in the vertical direction Dy. Furthermore, a folding piece 1e is protruded from both sides of the mounting surface 12 and the bottom surface 1a in the vertical direction Dy. In the box body 10, each folding piece 1e is folded inward of the short side surface 1d, and each side overlapping surface 1j is folded further inward of the folding piece 1e.

[0037] In this embodiment, a pair of protruding pieces 1k are provided on each of the inner overlap surface 1g and the side overlap surface 1j. Also, a plurality of fitting holes 1m into which the protruding pieces 1k can be fitted are formed on the bottom side surface 1b. In the box 10, the inner overlap surface 1g and the side overlap surface 1j are fixed to the bottom side surface 1b by fitting each of the protruding pieces 1k into the fitting holes 1m. In addition, an insertion piece 1n is provided to protrude from both sides of the outer overlapping surface 1f in the vertical direction Dy. When the blank sheet 1S is assembled into the box body 10, the insertion piece 1n is inserted into the gap between the short side surface 1d and the folding piece 1e, thereby holding the outer overlapping surface 1f overlapped on the outside of the mounting surface 12.

[0038] Furthermore, on both sides of the lid side surface 1c in the vertical direction Dy, frame pieces 1p are provided to fill the gap between the lid side surface 1c and the short side surface 1d in the box body 10. When the blank sheet 1S is assembled into the box body 10, the frame pieces 1p are folded inward of the side overlapping surfaces 1j. In addition, in the blank sheet 1S, at the positions where it is folded when assembling the box 10, lines (grooves) or perforations are provided to guide folding.

[0039] 6(a), the blank sheet 1S is placed, for example, with the bottom surface 1b on a flat surface, and the mounting surface 12 and the lower surface 1a are folded up from the bottom surface 1b, and the fold-out piece 1e is folded from the mounting surface 12 and the lower surface 1a. As a result, the mounting surface 12, the lower surface 1a, and the fold-out piece 1e are arranged to form a rectangular tubular wall. Next, the short side 1d is folded up from the bottom side 1b, and then the side overlapping surface 1j is folded down from the short side 1d and overlapped on the inside of the folded piece 1e. Then, as shown in Fig. 6(b), the convex piece 1k protruding from the side overlapping surface 1j is inserted into the corresponding fitting hole 1m of the bottom side 1b, so that the side overlapping surface 1j is fixed to the bottom side 1b. This keeps the short side 1d perpendicular to the bottom side 1b.

[0040] On the other hand, the handle 1 is attached to the mounting surface 12 as described above. Also, the inner overlapping surface 1g extending from the mounting surface 12 is folded down from the mounting surface 12 and overlapped on the inside of the mounting surface 12. Then, as shown in Fig. 7(a), a convex piece 1k protruding from the inner overlapping surface 1g is inserted into a corresponding fitting hole 1m in the bottom side surface 1b, whereby the inner overlapping surface 1g is fixed to the bottom side surface 1b. In this manner, when both the side overlapping surfaces 1j and the inner overlapping surface 1g are fixed to the bottom surface 1b, the lower surface 1a, the inner overlapping surface 1g, the pair of side overlapping surfaces 1j, and the bottom surface 1b form a container shape (a rectangular cylinder with a bottom). Therefore, the internal space Si surrounded by the above-mentioned container-shaped surfaces 1a, 1g, 1j, and 1b can contain contents (not shown).

[0041] When the contents are placed in the internal space Si, the cover side surface 1c is placed so as to cover the bottom side surface 1b, as shown in FIG. 7(b). This closes the internal space Si. At this time, the frame piece 1p is inserted inside the side overlapping surface 1j. Then, the outer overlapping surface 1f is folded over on the outside of the mounting surface 12, and the insertion piece 1n is inserted into the gap between the short side surface 1d and the fold-in piece 1e. This keeps the outer overlapping surface 1f overlapping on the outside of the mounting surface 12, as shown in FIG. 7(c). Also, the main body piece 2 of the handle 1 in use is pulled out to the outside of the box body 10 through the through hole 1h of the outer overlapping surface 1f.

[0042] The handle 1 may be attached to the mounting surface 12 at any time before the outer overlapping surface 1f is overlapped on the outside of the mounting surface 12. For example, the handle 1 may be attached before the mounting surface 12 is folded up from the bottom side surface 1b [before it reaches the state shown in FIG. 6(a)], or it may be attached after the inner overlapping surface 1g is folded on the inside of the mounting surface 12 [when it reaches the state shown in FIG. 7(a)].

[0043] 8, in the packaging box 30 in which the handle 1 is attached and the assembly of the box body 10 is completed, the mounting surface 12 is the upper surface, and a part of the main body piece 2 of the handle 1 is disposed in a position protruding above the mounting surface 12. In such a packaging box 30, the locking piece 3 in the used state is disposed below the mounting surface 12. Here, the locking piece 3 in which each of the tip portion 31 and the side portion 32 is disposed in contact with the mounting surface 12 is exemplified.

[0044] On the other hand, the main body piece 2 bent at the connecting end 21 from the locking piece 3 is disposed above the mounting surface 12 through the narrow portion 34 of the insertion hole 11, and forms an arch shape. The main body piece 2 of this embodiment forms an arch shape between the pair of locking pieces 3 in the usage state. In the packaging box 30, the inner overlapping surface 1g of the box body 10 covers the locking piece 3 of the handle 1 in use from below. The inner overlapping surface 1g arranged in this manner closes the insertion hole 11 from the lower side (the internal space Si side). Meanwhile, the outer overlapping surface 1f of the box body 10 overlaps the upper side of the mounting surface 12. The outer overlapping surface 1f of this embodiment is arranged so as to overlap at least a part of the wide flap 15, and holds down the wide flap 15 from above. Also, the through hole 1h of the outer overlapping surface 1f overlaps with the narrow portion 34 of the insertion hole 11. The arch-shaped main body piece 2 is arranged in the through hole 1h as described above.

[0045] When the packaging box 30 is lifted, the user grasps the main body piece 2 of the handle 1 and pulls it upward. At this time, an upward pulling force acts on the locking piece 3 connected to the connecting end 21 of the main body piece 2. Even when such an upward pulling force acts on the locking piece 3, both the tip portion 31 and the side portion 32 are caught on the mounting surface 12, so that the locking piece 3 is prevented from coming out of the insertion hole 11.

[0046] [2. Actions and Effects] (1) In the above-mentioned handle structure 20, the handle 1 is formed from a single sheet material, and therefore, compared to conventional handles, there is no need to sew both ends together, and since the handle is flat when unused, it is possible to avoid thickening. In this way, the handle structure 20 can simplify the structure of the handle 1. This increases the ease of manufacture of the handle 1, and also increases the storability of the handle 1.

[0047] Furthermore, in the handle 1, the locking piece 3 has a shape that bulges out in the short direction D2 more than the main body piece 2, so even if an upward tensile force acts on the locking piece 3 arranged below the mounting surface 12 in the use state, the locking piece 3 can be hooked onto the mounting surface 12. In detail, the portion of the locking piece 3 that bulges out in the short direction D2 more than the main body piece 2 can be hooked onto the mounting surface 12. This allows the locking piece 3 to be stably locked onto the lower side of the mounting surface 12 in the short direction D2 (width direction DW). Therefore, the locking piece 3 can be prevented from coming off the insertion hole 11.

[0048] Furthermore, since the tip 31 and side 32 of the locking piece 3 are disposed on both sides (outside and inside) of the connecting end 21 of the main body piece 2 in the longitudinal direction D1, when an upward tensile force is applied, the tip 31 and side 32 are caught on the mounting surface 12 on both sides of the connecting end 21, so that the locking piece 3 can be stably locked to the underside of the mounting surface 12 even in the longitudinal direction D1 (length direction DL). Therefore, the posture of the handle 1 when in use can be more stabilized. As described above, according to the handle structure 20, it is possible to simultaneously simplify the structure of the handle 1 and stabilize its posture when in use.

[0049] (2) According to the insertion hole 11 having the wide portion 33 through which the locking piece 3 can be inserted and the narrow portion 34 formed with a width dimension smaller than that of the wide portion 33, the handle 1 can be attached to the attachment surface 12 by passing the locking piece 3 of the handle 1 through the wide portion 33, and the position of the main body piece 2 in the usage state can be regulated by the narrow portion 34. Therefore, the ease of attachment of the handle 1 to the attachment surface 12 is improved, and the posture of the handle 1 in the usage state can be further stabilized by locking the main body piece 2 in the usage state by the narrow portion 34.

[0050] (3) According to the mounting surface 12 having the wide flap 15 that covers at least a part of the wide portion 33, the wide flap 15 can restrict the movement of the main body piece 2 of the handle 1 from the narrow portion 34 to the wide portion 33 in the used state. This makes it possible to further stabilize the posture of the handle 1 in the used state. In addition, the wide flap 15 can prevent foreign objects from entering from the wide portion 33 to the lower side of the mounting surface 12 and the leakage of contents from the wide portion 33 to the upper side of the mounting surface 12. In other words, the wide flap 15 reduces the opening area of ​​the wide portion 33, so that it is possible to prevent foreign objects and contents from entering or exiting through the wide portion 33. This contributes to protecting the contents.

[0051] (4) As described above, the packaging box 30 having the handle structure 20 described above can also simplify the structure of the handle 1 and stabilize the posture of the handle 1 when in use. (5) According to the box 10 having the inner overlapping surface 1g that is folded over below the mounting surface 12 to cover the locking piece 3 in use from below, the inner overlapping surface 1g can prevent contact between the contents contained in the box 10 and the locking piece 3. In addition, the inner overlapping surface 1g that is folded over below the mounting surface 12 closes the insertion hole 11 from below, thereby preventing the contents from leaking out of the box 10 from the insertion hole 11 and preventing foreign objects from entering the inside of the box 10 from the insertion hole 11. This contributes to protecting the contents.

[0052] (6) According to the box body 10 having the belt-shaped through hole 1h and the outer overlapping surface 1f that is folded over the upper side of the mounting surface 12, the mounting surface 12 is reinforced from above by the outer overlapping surface 1f, while the main body piece 2 of the handle 1 can be pulled out to the upper side of the outer overlapping surface 1f through the through hole 1h. Therefore, it is possible to provide a packaging box 30 in which the posture of the handle 1 is further stabilized. (7) If the tip 31 of the locking piece 3 has a tapered shape in which the dimension in the short direction D2 gradually decreases toward the outside in the longitudinal direction D1, the locking piece 3 can be easily inserted from the tip 31 into the insertion hole 11. This makes it easier to attach the handle 1 to the attachment surface 12.

[0053] (8) If the handle 1 has a pair of locking pieces 3 connected to both connecting ends 21 of the main body piece 2 in the longitudinal direction D1, the pair of locking pieces 3 can be locked to the underside of the mounting surface 12 as described above, thereby fixing the main body piece 2 in a double-supported state. This makes it possible to further stabilize the posture of the handle 1.

[0054] (9) If the handle 1 is made of paper, material costs can be reduced and plastic waste can be reduced (realizing the so-called "plastic-free" approach) compared to when the handle 1 is made of plastic. (10) If the main body piece 2 and the locking piece 3 as a whole have a single-layer structure in use, the structure of the handle 1 can be further simplified compared to a case in which the main body piece 2 and the locking piece 3 have a multi-layer structure with at least a portion folded over. Also, since there is no need to fold other sheet-like parts onto the main body piece 2 and the locking piece 3 when attaching them to the attachment surface 12, the ease of attaching the handle 1 to the attachment surface 12 can be improved.

[0055] [3. Modifications] Modifications of the above embodiment will be described below. In the following description, elements that are the same as or correspond to elements shown in the above embodiment will be given the same reference numerals, and duplicated description will be omitted.

[0056] [3-1. Handle] Instead of the above-described handle 1, the handle 1 shown in Figures 9 to 15 may be applied. Note that in Figures 9 to 15, the ruled lines 25 provided on the main body piece 2 of the handle 1 are omitted as appropriate. Also, Figures 9 to 12 and 15 show an example of a handle 1 in which the locking piece 3 is substantially elliptical.

[0057] <hole> 9, the handle 1 may include holes 5 formed in the connection between the connecting end 21 of the main body piece 2 and the slit 4. Specifically, the holes 5 are provided at the portion where the outer end of the slit 4 in the longitudinal direction D1 and the end of the connecting end 21 in the lateral direction D2 are connected. Here, a circular hole 5 is shown as an example. The size of each hole 5 is set to be small enough so that the strength and rigidity of the handle 1 are not significantly reduced. The hole 5 distributes the load when the main body piece 2 is bent from the locking piece 3 at the connecting end 21. That is, the hole 5 relieves stress concentration at the connection portion between the connecting end 21 of the main body piece 2 and the slit 4.

[0058] With the handle 1 having such a hole 5, even if a tensile force acts on the locking piece 3 from the main body piece 2, the load is dispersed by the hole 5, so that stress concentration can be alleviated at the connection portion between the connecting end 21 of the main body piece 2 and the slit 4. This makes it possible to prevent the locking piece 3 from tearing along the extension line of the slit 4. Therefore, damage to the handle 1 can be prevented.

[0059] <Auxiliary slit> As shown in FIG. 10, the handle 1 may have an auxiliary slit 6 cut in an arc shape from the connection part between the connecting end 21 of the main body piece 2 and the slit 4 toward the outside in the longitudinal direction D1, instead of the hole 5. Specifically, the auxiliary slit 6 is cut in an arc shape from the part where the outer end of the slit 4 in the longitudinal direction D1 and the end of the connecting end 21 in the short direction D2 are connected toward the outside in the longitudinal direction D1. Here, a pair of auxiliary slits 6 extending in a semicircular shape from the connection part between the connecting end 21 of the main body piece 2 and the slit 4 in the direction away from each other is illustrated. The size of each auxiliary slit 6 is set to be sufficiently small so that the strength and rigidity of the handle 1 are not significantly reduced. The auxiliary slits 6 distribute the load when the main body piece 2 is bent from the locking piece 3 at the connecting end 21. That is, the auxiliary slits 6, like the hole 5 described above, relieve stress concentration at the connection portion between the connecting end 21 of the main body piece 2 and the slit 4.

[0060] The handle 1 with such an auxiliary slit 6 can achieve the same effects and advantages as the handle 1 with the hole 5. Specifically, even if a tensile force acts on the locking piece 3 from the main body piece 2, the load is distributed by the auxiliary slit 6, so that stress concentration can be alleviated at the connection between the connecting end 21 of the main body piece 2 and the slit 4. This can prevent the locking piece 3 from tearing along the extension line of the slit 4. Therefore, damage to the handle 1 can be prevented.

[0061] <Reinforcement piece> 11 , the handle 1 may include an engagement reinforcement piece 7 connected to the engagement piece 3, and a main body reinforcement piece 8 connected to the engagement reinforcement piece 7. The engagement reinforcement piece 7 is configured to reinforce the engagement piece 3, and the main body reinforcement piece 8 is configured to reinforce a portion of the main body piece 2 adjacent to the engagement piece 3.

[0062] The locking reinforcement piece 7 is folded over the locking piece 3 when in use. Here, an example of the locking reinforcement piece 7 is shown, which is connected to the tip 31 of the locking piece 3 via a boundary line 13 extending along the short side direction D2. The locking reinforcement piece 7 has a shape symmetrical to the locking piece 3 with respect to the boundary line 13. Therefore, when the handle 1 is in a used state where it is folded at the boundary line 13, the locking reinforcement piece 7 fits perfectly over the locking piece 3. Note that while FIG. 11 shows an example of a handle 1 provided with an auxiliary slit 6, in a handle 1 provided with a locking reinforcement piece 7, the auxiliary slit 6 may be omitted, or the above-mentioned hole 5 may be provided instead of the auxiliary slit 6.

[0063] When in use, the main body reinforcement piece 8 overlaps a part of the main body piece 2 including the connecting end 21 (hereinafter also referred to as the "reinforcement target part"). The main body reinforcement piece 8 of this modified example has a shape symmetrical to the reinforcement target part of the main body piece 2 with respect to the boundary line 13 between the locking piece 3 and the locking reinforcement piece 7. Therefore, when in use with the handle 1 folded at the boundary line 13, the main body reinforcement piece 8 overlaps exactly with the reinforcement target part of the main body piece 2.

[0064] Handle 1 of this modified example further includes overlapping slit 14 and overlapping auxiliary slit 16 which overlap slit 4 and auxiliary slit 6, respectively, when folded at boundary line 13. Thus, in this modified example, the portion on the outer side of boundary line 13 in longitudinal direction D1 (upper side in FIG. 11) has a symmetrical structure with the corresponding portion on the inner side of boundary line 13 in longitudinal direction D1 (lower side in FIG. 11).

[0065] 12, in the used state, the locking reinforcement piece 7 and the main body reinforcement piece 8 are respectively placed on the upper side of the locking piece 3 and the portion to be reinforced of the main body piece 2. In other words, the handle 1 is attached to the mounting surface 12 in a position in which the locking reinforcement piece 7 is disposed between the locking piece 3 and the mounting surface 12. Therefore, the locking reinforcement piece 7 is fixed to the underside of the mounting surface 12 by being sandwiched between the locking piece 3 and the mounting surface 12, even if it is not attached to the locking piece 3 with an adhesive or bonding agent.

[0066] When this modified example is in use, the locking reinforcement piece 7 is folded over the entire locking piece 3, and the main body reinforcement piece 8 is placed over the reinforcement target portion of the main body piece 2. Therefore, when this modified example is in use, the reinforcement target portion of the main body piece 2 and the entire locking piece 3 form a two-layer structure (a structure in which two sheet-like portions are placed over each other). When a handle 1 having such a two-layer structure is used, the length dimension Ln of the narrow portion 34 of the insertion hole 11 is preferably set to be greater than twice the thickness dimension T of the sheet material that forms the handle 1 (Ln>2×T). This makes it easier to arrange the reinforcement target portion having a two-layer structure in the narrow portion 34 of the insertion hole 11 in the main body piece 2.

[0067] In addition, when in use, the locking reinforcement piece 7 and the main body reinforcement piece 8 may be overlapped under the locking piece 3 and the portion to be reinforced of the main body piece 2, respectively. In other words, the handle 1 may be attached to the mounting surface 12 in a position in which the locking piece 3 is disposed between the mounting surface 12 and the locking reinforcement piece 7. In this case, the locking reinforcement piece 7 may be attached to the locking piece 3 with an adhesive or glue, or the locking reinforcement piece 7 and the main body reinforcement piece 8 may be fixed by sandwiching it between the main body piece 2 and the mounting surface 12.

[0068] According to the handle 1 equipped with the locking reinforcement piece 7, the locking piece 3 is reinforced by the locking reinforcement piece 7, so that even if an upward pulling force acts on the locking piece 3 in the usage state, the locking piece 3 can be more stably locked to the lower side of the attachment surface 12. Therefore, the posture of the handle 1 in the usage state can be further stabilized. Furthermore, with the handle 1 having the main body reinforcing piece 8, the main body piece 2 can be reinforced with the main body reinforcing piece 8 at the portions (reinforcement target portions) that are likely to come into contact with the connecting end portion 21 that is bent from the locking piece 3 during use and the edge portion surrounding the insertion hole 11 of the mounting surface 12. Therefore, damage to the handle 1 can be suppressed.

[0069] <Modifications of the locking reinforcement piece> The position where the locking reinforcement piece 7 is connected to the locking piece 3 is not limited to the tip portion 31. For example, as shown in Fig. 13, the locking reinforcement piece 7 may be connected to the short side direction D2 of the locking piece 3 via a boundary line 13 extending along the longitudinal direction D1. Here, a substantially rectangular locking reinforcement piece 7 is illustrated, in which the tip portion 31 and the side portion 32 are both arranged side by side in the short side direction D2 of the locking piece 3, which is rectangular in shape.

[0070] The locking reinforcement piece 7 of this modification has a notch 9 through which the main body piece 2 is inserted when folded over the locking piece 3. The notch 9 is a feature for avoiding interference between the locking reinforcement piece 7 and the main body piece 2 when the handle 1 is folded at the boundary line 13 in use. In a handle 1 in which the boundary line 13 extends along the longitudinal direction D1, the notch 9 and the connecting end 21 of the main body piece 2 are arranged to be aligned in the lateral direction D2. Note that while FIG. 13 illustrates an example of a handle 1 with a hole 5, in a handle 1 with a notch 9, the hole 5 may be omitted, or an auxiliary slit 6 may be provided instead of the hole 5.

[0071] In the use state of the handle 1 of this modified example folded at the boundary line 13, the locking reinforcement piece 7 overlaps the entire locking piece 3, and the main body piece 2 is inserted into the cutout 9. As shown in Fig. 14, the handle 1 in such a use state is attached to the mounting surface 12 with the locking reinforcement piece 7 disposed between the locking piece 3 and the mounting surface 12. Therefore, the locking reinforcement piece 7 is fixed to the underside of the mounting surface 12 by being sandwiched between the locking piece 3 and the mounting surface 12, even if it is not attached to the locking piece 3 with an adhesive or bonding agent. Even when this modified example is in use, the locking reinforcement piece 7 is folded over the entire locking piece 3, so that the entire locking piece 3 has a two-layer structure.

[0072] The handle 1 having the notch 9 can reinforce the locking piece 3 with the locking reinforcement piece 7 while avoiding interference between the locking reinforcement piece 7 and the main body piece 2. This further stabilizes the position of the handle 1 when in use.

[0073] <Handle integrated with mounting surface> As shown in Fig. 15, the handle 1 may be provided integrally with the mounting surface 12. In the main body piece 2 of such a handle 1, one connecting end 21 (upper side in Fig. 15) is connected to the locking piece 3, and the other connecting end 21 (lower side in Fig. 15) is connected to the mounting surface 12. The handle 1 of this modification can be formed by cutting the mounting surface 12 along a line corresponding to the outer edge of the locking piece 3, the slit 4, and the middle edge 24 of the main body piece 2. Note that since only one locking piece 3 is provided in this modification, it is sufficient to form one insertion hole 11 in the mounting surface 12. Here, a rectangular insertion hole 11 is shown as an example. When in use, the main body piece 2 is folded back to the upper side (one side) from the other connecting end 21 connected to the mounting surface 12, and the locking piece 3 connected to one connecting end 21 of the main body piece 2 is inserted from the upper side (one side) into the insertion hole 11 and positioned on the lower side (other side) of the mounting surface 12.

[0074] According to the handle 1 of this modification, the other connecting end 21 of the main body piece 2 is connected to the mounting surface 12, so that the mounting surface 12 and the handle 1 can be integrated. This improves the storability of the handle 1. Also, since the handle 1 can be put into a usable state simply by engaging one of the locking pieces 3 connected to one connecting end 21 of the main body piece 2 with the mounting surface 12, the ease of mounting the handle 1 to the mounting surface 12 can be improved.

[0075] <Other> In preparation for the case where water adheres to the handle 1, the sheet material forming the handle 1 may be provided with a water repellent, a water resistance agent, or a paper strength enhancer, or may be laminated. In addition, in order to improve the feel, a pigment coating layer or a resin coating layer may be provided on the surface of the sheet material forming the handle 1. In addition, the handle 1 may be printed or colored to improve the sense of unity with the box body 10. In addition, the handle 1 may be printed or embossed to look like leather, which enhances the sense of luxury. It is also possible to use handles 1 stacked together.

[0076] [3-2. Mounting surface] Instead of the above-mentioned mounting surface 12, the mounting surface 12 shown in Figs. 16 to 21 may be used. Also, as the insertion hole 11 formed in the mounting surface 12, the insertion hole 11 shown in Figs. 22(a) to (c) may be used. In the following modified examples, the ruled lines 25 provided on the main body piece 2 of the handle 1 are omitted as appropriate, and a handle 1 in which the locking piece 3 is substantially elliptical is exemplified. Also, Figs. 16 to 21 show only the handle structure 20 (handle 1 and mounting surface 12), and the inner overlapping surface 1g and the outer overlapping surface 1f of the box body 10 are omitted.

[0077] <First Modification> As shown in Fig. 16, the mounting surface 12 according to the first modified example differs from the mounting surface 12 shown in the above embodiment in that the wide portion 33 of the insertion hole 11 is slit-shaped and in that it has a narrow flap 17 that covers at least a part of the narrow portion 34. Here, the narrow flap 17 is exemplified as having the same shape as the narrow portion 34 and covering the entire narrow portion 34. Note that Fig. 16 shows the narrow flap 17 in a state where it covers the narrow portion 34. In this modification, the wide portion 33 extends linearly along the width direction DW. Meanwhile, the narrow portion 34 is rectangular, as in the above embodiment. In this modification, the width dimension Ww of the wide portion 33 and the width dimension Wn of the narrow portion 34 also satisfy the size relationship shown in the above embodiment (W2 <Wn<W3<Ww)。

[0078] The narrow flap 17 has a main body 17a having a shape corresponding to the narrow portion 34, and a base 17b extending in the width direction DW and forming a swing axis of the main body 17a. The main body 17a of this modified example is disposed on the outer side Da in the length direction with respect to the base 17b. The main body 17a can swing around the base 17b. The narrow flap 17 abuts against the locking piece 3 of the handle 1 in the used state by folding the main body 17a from the base 17b downward on the mounting surface 12. The base 17b may be provided with a groove (ruled line) or perforations for guiding the folding. The narrow flap 17 may be formed smaller than the narrow portion 34 and cover only a part of the narrow portion 34.

[0079] The narrow portion 34 in this modified example is exposed as the main body portion 17a of the narrow flap 17 swings (the base portion 17b is folded). For example, as shown in Fig. 17, when the narrow flap 17 is pushed downwardly of the attachment surface 12, the narrow portion 34 is exposed and the main body piece 2 can be positioned. The handle 1 is inserted into the slit-shaped wide portion 33 from the tip portion 31 of the locking piece 3. Then, after the entire locking piece 3 is positioned below the mounting surface 12 through the wide portion 33, the handle 1 is shifted inward in the length direction Db so that the main body piece 2 is positioned at the narrow portion 34. At this time, the main body portion 17a of the narrow flap 17 is bent downward from the base portion 17b. Furthermore, the main body piece 2 is bent from the locking piece 3 at the connecting end portion 21. This completes the attachment of the locking piece 3 to the mounting surface 12. In the use state of this modified example, the narrow flap 17 bent downward comes into contact from above with the side portion 32 of the locking piece 3 arranged on the underside of the mounting surface 12. In addition, the main body piece 2 is arranged in a state where it is pulled out to the upper side of the mounting surface 12 through the narrow portion 34.

[0080] As described above, according to the mounting surface 12 having the narrow flap 17 that covers at least a part of the narrow portion 34, the narrow flap 17 can prevent foreign objects from entering the mounting surface 12 from the narrow portion 34 to the lower side, and the contents from leaking from the narrow portion 34 to the upper side of the mounting surface 12. In other words, the narrow flap 17 reduces the opening area of ​​the narrow portion 34, so that it is possible to prevent foreign objects and contents from entering or exiting through the narrow portion 34. This contributes to protecting the contents stored in the box 10. In addition, in the use state, even if an upward pulling force acts on the locking piece 3, the narrow flap 17 abuts against the locking piece 3 from above, so that the locking piece 3 can be caught by the narrow flap 17. This effectively prevents the locking piece 3 from coming out of the insertion hole 11. Therefore, the posture of the handle 1 in the use state can be more stabilized.

[0081] The narrow flap 17, in which the main body 17a is disposed on the outer side Da in the longitudinal direction of the base 17b and which abuts against the side portion 32 of the locking piece 3 in the used state, can regulate the position of the side portion 32 of the locking piece 3 in the used state. Even if an upward tensile force acts on the locking piece 3, the narrow flap 17 catches on the side portion 32 of the locking piece 3, effectively preventing the locking piece 3 from coming out of the insertion hole 11. This can further stabilize the posture of the handle 1 in the used state.

[0082] The slit-shaped wide portion 33 can suppress the intrusion of foreign matter into the lower side of the mounting surface 12 (inside the box 10) and the leakage of contents from the lower side of the mounting surface 12, compared to the rectangular wide portion 33 shown in the above embodiment. This contributes to the protection of the contents stored in the box 10. The arrangement of the locking piece 3 relative to the insertion hole 11 is not limited to the example shown in FIG. 17. The locking piece 3 may be arranged in a position where the tip 31 overlaps the underside of the narrow flap 17 (a position where the locking piece 3 in FIG. 17 is inverted). That is, the main body piece 2 may be folded in the opposite direction to the example in FIG. 17 relative to the locking piece 3, and the narrow flap 17 may abut against the tip 31 of the locking piece 3 from above. Even with such an arrangement, when an upward pulling force is applied to the locking piece 3 in the use state, the locking piece 3 can be hooked on the narrow flap 17. This effectively prevents the locking piece 3 from coming off the insertion hole 11.

[0083] <Second Modification> As shown in Fig. 18, the attachment surface 12 according to the second modification is different from the attachment surface 12 shown in the first modification in that the main body 17a of the narrow flap 17 is arranged on the inner side Db in the longitudinal direction with respect to the base 17b. Here, the base 17b arranged on the same straight line as the slit-shaped wide portion 33 is illustrated. Note that Fig. 18 shows the narrow flap 17 in a state in which the narrow portion 34 is covered.

[0084] Specifically, the wide portion 33 of this modified example includes a pair of slits 35 cut from the base 17b of the narrow flap 17 to both sides in the width direction DW. When the main body 17a of the narrow flap 17 is folded from the base 17b, the wide portion 33 of this modified example has a portion corresponding to the base 17b and the slits 35 that form a continuous straight cut in the width direction DW, allowing the locking piece 3 to be inserted therethrough. In this modified example as well, the width dimension Ww of the wide portion 33 (the combined width dimension of each slit 35 and the base 17b of the narrow flap 17) and the width dimension Wn of the narrow portion 34 satisfy the magnitude relationship shown in the above embodiment (W2 <Wn<W3<Ww)。

[0085] With the main body 17a of the narrow flap 17 folded downward (inside the box 10) from the base 17b, the tip 31 of the locking piece 3 is inserted into the wide portion 33 that is cut at a position corresponding to the base 17b and the slit 35. Then, as shown in Fig. 19, after the entire locking piece 3 is placed below the mounting surface 12, the handle 1 is shifted inward in the length direction Db so that the main body piece 2 is positioned at the narrow portion 34. The main body piece 2 is also folded from the locking piece 3 at the connecting end 21. This completes the attachment of the locking piece 3 to the mounting surface 12. In the use state of this modified example, the narrow flap 17 bent downward comes into contact from above with the tip portion 31 of the locking piece 3 arranged on the underside of the mounting surface 12. In addition, the main body piece 2 is arranged in a state where it is pulled out to the upper side of the mounting surface 12 through the narrow portion 34.

[0086] As described above, the narrow flap 17, in which the main body 17a is disposed on the inner side Db in the longitudinal direction of the base 17b and which abuts against the tip 31 of the locking piece 3 in the used state, can regulate the position of the tip 31 of the locking piece 3 in the used state. Even if an upward tensile force acts on the locking piece 3, the narrow flap 17 catches on the tip 31 of the locking piece 3, effectively preventing the locking piece 3 from coming out of the insertion hole 11. This can further stabilize the posture of the handle 1 in the used state.

[0087] The arrangement of the locking piece 3 with respect to the insertion hole 11 is not limited to the example shown in FIG. 19. The locking piece 3 may be arranged in a posture in which the side portion 32 overlaps the lower side of the narrow flap 17 (a posture in which the locking piece 3 in FIG. 19 is reversed left and right). That is, the main body piece 2 may be bent to the opposite side of the locking piece 3 from the example in FIG. 19, and the narrow flap 17 may abut against the side portion 32 of the locking piece 3 from above. Even in such an arrangement, when an upward tensile force acts on the locking piece 3 in the use state, the locking piece 3 can be hooked on the narrow flap 17. Thereby, the detachment of the locking piece 3 from the insertion hole 11 can be effectively suppressed.

[0088] <Third Modified Example> As shown in FIG. 20, the mounting surface 12 according to the third modified example is different from the mounting surface 12 shown in the above embodiment in that the insertion hole 11 does not have the narrow portion 34, but instead the wide flap 15 has a concave portion 15c that functions in the same manner as the narrow portion 34. Here, a concave portion 15c that is cut out in a rectangular shape in the wide flap 15 is illustrated.

[0089] The wide portion 33 has a rectangular shape as in the above embodiment, and its width dimension Ww is set to be larger than the maximum dimension W3 in the short side direction D2 of the locking piece 3 (Ww>W3). On the other hand, the wide flap 15 of this modified example has a concave portion 15c whose width dimension is smaller than that of the wide portion 33 and covers a part of the wide portion 33. That is, the portion of the wide portion 33 of this modified example where the concave portion 15c of the wide flap 15 is arranged is always exposed without being covered by the wide flap 15.

[0090] The width dimension Wc of the concave portion 15c is set to be smaller than the width dimension Ww of the wide portion 33 and the maximum dimension W3 in the short side direction D2 of the locking piece 3, and larger than the dimension W2 between the opposing edge portions 23 of the main body piece 2, in the same manner as the width dimension Wn of the narrow portion 34 (W2<Wc<W3<Ww). The concave portion 15c of this modified example is cut out from the end portion on the inner side Db in the length direction of the main body portion 15a in the wide flap 15 and is provided at a distance from the base portion 15b. The main body piece 2 of the handle 1 in the use state is passed through the concave portion 15c.

[0091] The handle 1 is inserted from the tip 31 of the locking piece 3 into the wide portion 33 exposed by rolling up the wide flap 15. Then, as shown in FIG. 21, after the entire locking piece 3 is placed below the mounting surface 12 through the wide portion 33, the main body piece 2 is folded from the locking piece 3 at the connecting end 21. Then, the wide flap 15 is returned to a state in which it covers part of the wide portion 33. At this time, the position of the handle 1 relative to the wide flap 15 is adjusted so that the main body piece 2 is placed in the recess 15c of the wide flap 15. As a result, the main body piece 2 in the used state is passed through the recess 15c of the wide flap 15, and the attachment of the locking piece 3 to the mounting surface 12 is completed.

[0092] As described above, with the wide flap 15 having the recess 15c whose width dimension is smaller than the wide portion 33, the position of the main body piece 2 in the used state arranged in the recess 15c can be regulated by the wide flap 15, so that the posture of the handle 1 in the used state can be more stabilized as in the above embodiment. Also, with the insertion hole 11 not having the narrow portion 34, the insertion hole 11 can be made more compact than in a configuration in which the narrow portion 34 is provided adjacent to the wide portion 33, so that the rigidity of the mounting surface 12 can be more easily ensured.

[0093] <Other Modifications> 22(a) shows an insertion hole 11 according to a modified example in which the narrow flap 17 is omitted from the mounting surface 12 of the first and second modified examples described above (the portion corresponding to the narrow flap 17 is hollowed out). In the insertion hole 11 of this modified example, the wide portion 33 includes a pair of slits 35 spaced apart from each other in the width direction DW, and the narrow portion 34 is provided continuous with each slit 35 to form a rectangular opening between the slits 35. The narrow portion 34 of this modified example is configured similarly to the opening formed when the main body portion 17a of the narrow flap 17 described above is folded at the base portion 17b.

[0094] In the insertion hole 11 according to another modification shown in Fig. 22(b), the wide portion 33 of the insertion hole 11 shown in Fig. 22(a) is slightly enlarged in the length direction DL to be changed to a long and narrow rectangle. That is, it can be said that the insertion hole 11 of this modification has the slit width (length dimension Lw) of the wide portion 33 of the insertion hole 11 according to the above-mentioned one modification enlarged. 22(a) and (b), the locking piece 3 can be disposed below the mounting surface 12 through the wide portion 33, and the position of the main body piece 2 disposed in the narrow portion 34 can be stabilized. Therefore, the posture of the handle 1 in use can be stabilized.

[0095] 22(c), the narrow portion 34 of the insertion hole 11 may be trapezoidal in shape with the dimension in the width direction DW increasing the further it is from the wide portion 33 (toward the inner side Db in the length direction). In this way, by inclining the portions of the mounting surface 12 that sandwich the main body piece 2 from both sides in the width direction DW, the displacement of the main body piece 2 toward the wide portion 33 can be restricted, and the position of the main body piece 2 can be further stabilized. This further stabilizes the posture of the handle 1 when in use. The narrow portion 34 of the insertion hole 11 is not limited to the above-mentioned rectangular or trapezoidal shape, and may be, for example, a parallelogram or an elliptical shape extending in the width direction DW. [Explanation of symbols]

[0096] 1 Handle 1S Blank Sheet 1a Bottom side 1b Bottom side (long side) 1c Lid side (long side) 1d short side 1e Fold-in piece 1f Outer polymerization surface 1g Inner layer 1h through hole 1j side overlapping surface 1k convex piece 1m fitting hole 1n Insert 1p frame piece 2 body pieces 3 Locking piece 4 Slit 5 Hole 6 Auxiliary slit 7 Reinforcement piece 8 Main body reinforcement piece 9. Cutout 10 box body 11 Insertion hole 12 Mounting surface 13. Borderline 14 Polymerization slit 15 Wide flap 15a Main body 15b base 15c Recess 16 Polymerization auxiliary slit 17 Narrow flap 17a Main body 17b base 18 Recess 20 Handle structure 21 Connecting end (longitudinal end) 22 Longitudinal edge (short edge) 23 Opposite edge 24 Middle edge 25 Ruled Lines 30 packaging box 31 Tip 32 Side 33 Hirobe 34 Narrow area 35 Slit C1 Center line of longitudinal direction D1 C2 Center line of D2 in the short direction D1 Longitudinal direction D2 Width direction Da Outer length (first side) Db Lengthwise inside (second side) DL Length direction DW Width direction Dx Horizontal Dy Vertical L2: Dimension of main body piece 2 in the longitudinal direction D1 La Dimension between insertion holes 11 Ln Length of narrow portion 34 Lw Length of the wide section 33 Si internal space T: Sheet material thickness W2: Dimension between opposing edges 23 W3: Maximum dimension of the locking piece 3 in the short direction D2 Wc Width of the recess 15c Wn: width of narrow portion 34 Ww Width dimension of wide section 33

Claims

1. A mounting surface having an insertion hole formed therein; a belt-shaped main body piece extending in the longitudinal direction; and a locking piece connected to an end of the longitudinal direction of the main body piece, bulging out on both sides in the lateral direction from the main body piece, the locking piece including a tip portion located outside the end of the main body piece in the longitudinal direction and a pair of side portions located inside the end of the main body piece in the longitudinal direction and separated from the main body piece by a slit, the handle being formed from a single foldable sheet material, and in a usage state attached to the attachment surface, the locking piece is located inside the attachment surface, and the main body piece folded at the end from the locking piece is located outside the attachment surface through the insertion hole, the insertion hole has a wide portion through which the locking piece can be inserted, and a narrow portion adjacent to the wide portion, the narrow portion having a width dimension corresponding to the short side direction of the handle in the used state smaller than that of the wide portion, and through which the main body piece in the used state is inserted; The mounting surface has a narrow flap that covers at least a portion of the narrow portion. A handle structure characterized by

2. The narrow flap is disposed on a first side of a base portion that extends in the width direction and forms a pivot axis of the main body portion, the first side corresponding to the outer side in the longitudinal direction of the handle in the usage state, and abuts against the side portion in the usage state. The handle structure according to claim 1 .

3. The narrow flap is disposed on a second side of a base portion that extends in the width direction and forms a pivot axis of the main body portion, the second side corresponding to the inner side in the longitudinal direction of the handle in the usage state, and abuts against the tip portion in the usage state. The handle structure according to claim 1 .

4. The handle structure according to any one of claims 1 to 3, and a box body having a hexahedron shape with the mounting surface as an upper surface. A packaging box characterized by:

5. The box body has an inner overlapping surface that is folded inside the mounting surface to cover the engaging piece in the used state from below.

5. The packaging box according to claim 4.

6. The box body has a belt-shaped through hole for pulling out the main body piece in the used state to the outside and has an outer overlapping surface that is folded over the outside of the mounting surface.

6. The packaging box according to claim 4 or 5.

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