JP3220368U - Box sheet - Google Patents

Abstract

Provided is a box sheet that can easily close a lid while suppressing the generation of a gap by engaging a pair of outer flaps with a pair of lid flaps.
A box sheet includes a pair of outer lid flaps (5, 6) having substantially rectangular main bodies (15, 16) whose front ends are abutted in a plan view in an assembled state, and widths of front end edges of the main bodies (15, 16). Projecting pieces 17 and 18 projecting from the central portion in the direction, the main bodies 15 and 16 have a pair of engaging portions 15a and 16a at the tip portions on both sides in the width direction, and the pair of lid flaps 7 and 8 The first locking holes 21 and 22 into which the engaging portions 15a of the one outer lid flap 5 are inserted during assembly and the second locking holes 23 and 24 into which the engaging portions 16a of the other outer lid flap 6 are inserted. And a pair of outer flaps 5 and 6 have a pair of first mountain fold lines 19 and 20 extending from both ends in the width direction of the base edge to the center of the tip edge of the projecting piece, The flaps 7 and 8 in the lid extend from both ends in the width direction of the base end edge to the center of the leading edge of the flaps 7 and 8 in the lid. Building having a pair of second mountain fold lines 25.
[Selection] Figure 1

Description

  The present invention relates to a box sheet.

  A box formed by assembling corrugated cardboard sheets is widely used for storing and transporting articles. The corrugated cardboard sheet includes a pair of long face panels and a pair of wide face panels that are alternately connected in the left-right direction and assembled into a rectangular tube shape, and a pair of outer lids that extend from the upper edges of the pair of long face panels. A flap and a pair of lid flaps extending from the upper edges of the pair of width panels are assembled into a rectangular tube, and the pair of flaps on the inside In order to form a lid by bending the pair of outer lid flaps to the inside and further forming a lid portion, it is widely adopted.

  As this corrugated cardboard sheet, a structure in which a pair of outer flaps is engaged with a pair of lid flaps has been proposed so that the lid can be easily closed. For example, Japanese Utility Model Registration No. 3036366 proposes a pair of in-cover flaps provided with a pair of cuts for inserting both corners of the front edge of the pair of outer cover flaps.

Utility Model Registration No. 3036366

  The box described in the above publication has a pair of lids bent while a pair of lid flaps are bent inward, and a pair of lid outer flaps are inserted into a pair of cuts of the pair of lid flaps. It is said that the lid can be prevented from being opened by folding it on the upper surface of the inner flap.

  However, in this box body, a gap is likely to be generated between the front edges of the pair of lid outer flaps in an assembled state, and foreign substances are likely to be mixed from the gap. For this reason, in order to reliably close the lid portion, the box body needs to abut the sealing tape on the abutting portion after abutting the leading edges of the pair of lid outer flaps.

  The present invention has been made in view of such inconveniences, and by easily engaging the pair of lid flaps with the pair of lid flaps, the lid portion can be easily closed while suppressing the occurrence of a gap. It is an object to provide a box sheet that can be used.

  A box sheet according to the present invention, which has been made to solve the above problems, comprises a pair of long face panels and a pair of wide face panels which are composed of a single sheet and are alternately connected in the left-right direction and assembled into a rectangular tube shape. And a pair of outer lid flaps extending from the upper edges of the pair of long face panels, and a pair of lid flaps extending from the upper edges of the pair of width face panels, and can be assembled into a box shape. A box-shaped sheet, wherein the pair of lid flaps are substantially rectangular main bodies whose front ends are abutted in a plan view in an assembled state, and a projecting piece projecting from a central portion in the width direction of the front end edge of the main body. The main body has a pair of engaging portions at the front ends on both sides in the width direction, and the pair of lid flaps are inserted into the first lid outer flap engaging portion when assembled. The engaging hole and the engaging part of the other flap outside the lid are inserted. The first locking hole and the second locking hole have an elongated shape that inclines inward in the width direction from the proximal end side to the distal end side of the in-lid flap. The lid outer flap has a pair of first mountain fold lines extending from both ends in the width direction of the connecting portion with the pair of long surface panels to the center of the tip edge of the protruding piece, and the pair of lids The inner flap has a pair of second mountain fold lines extending from both ends in the width direction of the connecting portion with the pair of width surface panels to the central portion of the front end edge of the lid flap.

  In the box sheet, the pair of outer flaps has a pair of engaging portions at the front end portions on both sides in the width direction of the main body, and the pair of inner flaps is inserted into the pair of engaging portions. Since the hole and the second locking hole are provided, the engaging portion formed in one of the lid outer flaps is inserted into the first locking hole of the pair of lid flaps, and the other lid outer flap is inserted. The lid portion can be assembled by inserting the formed engaging portion into the second locking holes of the pair of lid flaps. Further, the box sheet includes a pair of first mountain fold lines in which the pair of outer flaps extends from both ends in the width direction of the connecting portion with the pair of long surface panels to the center portion of the leading edge of the projecting piece. And the pair of lid flaps has a pair of second mountain fold lines extending from both ends in the width direction of the connecting portion with the pair of width surface panels to the center of the front edge of the lid flap. Yes. Therefore, the box sheet is folded inward while folding the pair of outer lid flaps by the pair of first mountain fold lines in a state where the pair of inner flaps are folded by the pair of second mountain fold lines. Thus, the pair of engaging portions of the pair of lid outer flaps can be easily inserted into the first locking hole and the second locking hole of the pair of lid flaps. Further, the box sheet has a pair of main bodies whose front ends are brought together in a plan view when the pair of lid outer flaps are assembled, and a projecting piece projecting from the central portion in the width direction of the front end edge of the main body. Further, it is difficult for a gap to be formed between the front end edges of the main body in a state where the front end edges of the main body face each other in a plan view. Therefore, the box sheet can easily close the lid while suppressing the generation of the gap by engaging the pair of outer flaps with the pair of lid flaps.

  The first locking hole and the second locking hole have a circular arc shape protruding outward in the width direction of the in-lid flap, and the first locking hole and the second locking hole are the base of the in-lid flap. It is good to have a slit part formed with an end edge as one end, and a widened part that is continuous from the other end of the slit part and widens outward in the width direction of the flap in the lid. According to this configuration, the pair of engaging portions of the pair of outer lid flaps can be easily inserted into the first locking hole and the second locking hole from the widened portion, and the pair of engaging portions. By engaging with the slit portion, the pair of engaging portions can be reliably engaged with the first locking hole and the second locking hole.

  The front end of the first locking hole is positioned closer to the front end of the flap in the lid than the front end of the second locking hole, and the front ends of the first locking hole and the second locking hole are the flap in the lid. It is good to arrange at the center in the width direction. Thus, the tip of the first locking hole is located closer to the tip of the flap inside the lid than the tip of the second locking hole, and the tips of the first locking hole and the second locking hole are By disposing at the center in the width direction of the flap in the lid, the area of the pair of engaging portions is increased, and the pair of engaging portions are securely engaged with the first locking hole and the second locking hole. Easy to match.

  A pair of straight portions extending outward in the width direction from both ends of the projecting piece are formed at the distal end edge of the main body of the one lid outer flap, and the straight portions extend beyond the distal end of the second locking hole in an assembled state. It should be extended. In this manner, a pair of straight portions extending outward in the width direction from both ends of the projecting piece are formed at the front end edge of the main body of the one outer lid flap, and the straight portions are in the assembled state in the second locking hole. By extending beyond the tip, it is possible to prevent the pair of engaging portions of the one outer lid flap in the assembled state from coming off from the first locking hole.

  The width of the protruding piece of the other lid outer flap may be larger than the distance between the tips of the first locking holes of the pair of lid flaps in the assembled state. As described above, the width of the protruding piece of the other lid outer flap is larger than the distance between the tips of the first locking holes of the pair of lid flaps in the assembled state. Generation | occurrence | production of the clearance gap in a cover part can be prevented more reliably, suppressing the detachment | leave from a said 1st locking hole of a pair of engaging part fully.

  In the present invention, the “left-right direction” means the horizontal direction in the assumed general usage of the box formed by assembling the sheet for the box, and “up” means the assumed general Although it means the above in a use aspect, it does not intend restrict | limiting the direction at the time of use of the said box. The “mountain fold line” means an easy folding line that is bent convexly outward (on the outer surface side of the box) based on the assembled state.

  As described above, the box sheet according to the present invention can easily close the lid while suppressing the generation of a gap by engaging the pair of lid flaps with the pair of lid flaps. .

It is a typical top view showing the sheet for boxes concerning one embodiment of the present invention. It is a typical perspective view which shows the assembly procedure of the sheet | seat for boxes of FIG. It is a typical perspective view which shows the assembly procedure following FIG. 2 of the sheet | seat for boxes of FIG. It is a typical top view of the box formed by assembling the box sheet of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[Box sheet]
The box sheet in FIG. 1 is composed of one sheet. The box sheet is alternately connected in the left-right direction, and is assembled into a rectangular tube shape. The pair of long face panels (first length face panel 1 and second length face panel 2) and the pair of width face panels (first A first width panel 3 and a second width panel 4) and a pair of outer lid flaps extending from the upper edges of the pair of long surface panels 1, 2 (first extending from the upper edge of the first length surface panel 1. 1 lid outer flap 5 and second lid outer flap 6 extending from the upper edge of the second length surface panel 2 and a pair of inner flaps extending from the upper edge of the pair of width surface panels 3 and 4 (first A first in-lid flap 7 extending from the upper edge of the first width surface panel 3 and a second in-lid flap 8) extending from the upper edge of the second width surface panel 4. The first length surface panel 1, the first width surface panel 3, the second length surface panel 2, and the second width surface panel 4 are connected in this order from one side in the left-right direction to the other side in the left-right direction. Further, the box sheet includes a first bottom forming flap 9 and a second bottom forming flap 10 extending from the lower edges of the pair of long surface panels 1 and 2, and the lower edges of the pair of width surface panels 3 and 4. A third bottom forming flap 11 and a fourth bottom forming flap 12 that extend, and a glue margin 13 that extends from the side edge of the first length surface panel 1 opposite to the side connected to the first width surface panel 3. Prepare. The pair of long surface panels 1 and 2 and the pair of width surface panels 3 and 4 are connected endlessly by adhering the adhesive margin 13 to the inner surface of the second width surface panel 4. The adhesive margin 13 can be attached to the second width surface panel 4 using, for example, an adhesive or a stapler. The box sheet can be assembled into a box shape. Specifically, the box sheet is assembled into the box of FIG. 4 through the assembly procedure shown in FIGS. In FIG. 1, a thick solid line indicates a cutting line formed by cutting the sheet, and a thin solid line indicates a ruled line formed by pushing the inner surface of the sheet. Further, “down” means below in the assumed general usage mode, but is not intended to limit the orientation of the box in use.

  The sheet used for the box sheet is not particularly limited as long as it has sufficient strength to maintain the shape of the box formed by assembling the box sheet. For example, the sheet made of paper such as cardboard sheet or cardboard is used. Examples thereof include a sheet, a synthetic resin sheet, and a laminated sheet of a paper sheet and a synthetic resin sheet. Among them, a paper sheet is preferable from the viewpoint of processability, impact absorbability, handleability, recyclability, economy, and the like, and a corrugated cardboard sheet that can easily increase the buckling strength is particularly preferable. The corrugated cardboard forming the box sheet is obtained by bonding a core formed of a base paper into a corrugated shape to a liner, for example, a single side in which the core formed in a corrugated shape is bonded to a single liner Corrugated cardboard sheet, double-sided cardboard sheet with a liner attached to the top of a single-sided cardboard sheet, double-sided cardboard sheet with a single-sided cardboard sheet laminated with one-sided cardboard sheet, single-sided cardboard on one side of a double-sided cardboard sheet A double-sided corrugated cardboard sheet in which the tops of the sheets are further bonded together can be used. Among these, double-sided cardboard sheets are preferable from the viewpoint of processability, economy, durability, and the like. The ridge line direction of the core of the corrugated cardboard sheet is preferably arranged in the vertical direction from the viewpoint of increasing the buckling strength of the box.

<Long and wide panels>
The pair of long surface panels 1 and 2 are formed in a rectangular shape and substantially the same shape. The pair of width surface panels 3 and 4 are formed in a rectangular shape and substantially the same shape. The length in the left-right direction of the pair of long surface panels 1 and 2 is larger than the length in the left-right direction of the pair of width surface panels 3 and 4. The vertical lengths of the pair of long surface panels 1 and 2 and the pair of width surface panels 3 and 4 are substantially equal.

  Although it does not specifically limit as the left-right direction length of a pair of long surface panels 1 and 2, From a viewpoint with which a cover part is easy to assemble in the below-mentioned procedure, it can be 15 cm or more and 35 cm or less, for example. The vertical lengths of the pair of long surface panels 1 and 2 and the pair of width surface panels 3 and 4 can be set as appropriate based on the size of the articles accommodated in the box. can do. The ratio of the length in the left-right direction of the width surface panels 3, 4 to the length in the left-right direction of the length surface panels 1, 2 is a pair of outer flaps 5 in a folded state by first mountain fold lines 19, 20 as will be described later. , 6 is bent inward so that the engaging portions 15a, 16a of the outer lid flaps 5, 6 can be easily inserted into the first locking holes 21, 22 and the second locking holes 23, 24. For example, it can be 0.6 or more and 0.9 or less.

<Flap outside the lid>
The pair of outer lid flaps 5, 6 are substantially rectangular main bodies 15, 16 whose front ends are butted in plan view in an assembled state, and projecting pieces 17 projecting from the center in the width direction of the front end edges of the main bodies 15, 16. , 18. The main bodies 15 and 16 have a pair of engaging portions 15a and 16a at the tip portions on both sides in the width direction. Further, the pair of outer lid flaps 5, 6 extend from the both ends in the width direction of the connecting portion with the pair of long surface panels 1, 2 to the center portion of the leading edge of the projecting pieces 17, 18. Mountain fold lines 19 and 20 are provided. Hereinafter, specific configurations of the first outer lid flap 5 and the second outer lid flap 6 will be described.

(1st lid flap)
As described above, the first outer lid flap 5 includes the substantially rectangular main body 15 that is abutted with the distal end edge of the main body 16 of the second outer lid flap 6 in plan view in the assembled state, and the width of the distal end edge of the main body 15. And a projecting piece 17 protruding from the central portion in the direction. Further, the main body 15 has a pair of engaging portions 15a at the tip portions on both sides in the width direction. The length of the main body 15 in the extending direction is approximately ½ of the length in the left-right direction of the width surface panels 3 and 4. In the main body 15, the portions that continue from the both ends in the width direction of the projecting piece 17 to the outside in the width direction constitute the engaging portion 15 a (that is, the width direction both ends of the base end edge of the projecting piece 17 and the engaging portion 15 a. There is no gap in between). As a result, as shown in FIGS. 2 and 4, both side edges of the projecting piece 17 are arranged to be continuous with the pair of first locking holes 21, 22 in the assembled state (that is, the width of the projecting piece 17. Is substantially equal to the distance between the pair of first locking holes 21 and 22 in the assembled state). As a result, in the assembled state, the gap between the main bodies 15 and 16 between the pair of first locking holes 21 and 22 in a plan view is completely closed by the projecting piece 17.

  The projecting piece 17 has a substantially rectangular shape whose longitudinal direction is the width direction. As a lower limit of the ratio of the protruding direction length of the projecting piece 17 to the extending direction length of the main body 15, 0.10 is preferable, and 0.15 is more preferable. On the other hand, the upper limit of the ratio is preferably 0.35, and more preferably 0.25. If the ratio is less than the lower limit, it may be difficult to reliably engage the pair of engaging portions 15a with the first locking holes 21 and 22, or the protruding piece 17 of the first lid flap 5 and the second lid. There is a possibility that foreign matter may enter the box from between the protruding pieces 18 of the outer flap 6. On the contrary, if the ratio exceeds the upper limit, the projecting piece 17 becomes unnecessarily large, and there is a possibility that the manufacturing cost and handleability of the box sheet will be insufficient.

  The pair of engaging portions 15 a are formed at both corners on the distal end side of the main body 15. A pair of linear portions 15 b extending outward in the width direction from both ends (both ends in the width direction) of the projecting piece 17 is formed at the front end edge of the main body 15. The straight portion 15b defines the tip edge of the engaging portion 15a. As shown in FIG. 4, the straight portion 15 b extends beyond the tips of the second locking holes 23 and 24 in the assembled state. In the box sheet, the first locking holes 21, 22 and the second locking holes 23, 24 are arranged at the center in the width direction of the first lid flap 7 and the second lid flap 8 as will be described later. ing. Therefore, the box sheet has a pair of engaging portions of the second lid outer flap 6 even when the pair of linear portions 15b extend beyond the tips of the pair of second locking holes 23, 24. The insertion of 16a into the second locking holes 23, 24 is not hindered by the pair of straight portions 15b. Further, the box sheet has a pair of engaging portions of the first outer lid flap 5 in the assembled state by the pair of linear portions 15b extending beyond the tips of the pair of second locking holes 23, 24. 15a can be prevented from coming off from the first locking holes 21 and 22.

  The pair of first mountain fold lines 19 are formed from the both ends in the width direction of the connecting portion (that is, the base end edge of the main body 15) of the first lid outer flap 5 to the first length surface panel 1. It extends over the central part. The pair of first mountain fold lines 19 is formed in a V shape as a whole.

(2nd lid flap)
As described above, the second outer lid flap 6 includes the substantially rectangular main body 16 that is abutted with the front end edge of the main body 15 of the first outer cover flap 5 in the assembled state, and the width of the front end edge of the main body 16. And a projecting piece 18 projecting from the center of the direction. Further, the main body 16 has a pair of engaging portions 16a at the tip portions on both sides in the width direction. The length of the main body 16 in the extending direction is substantially ½ of the length in the left-right direction of the width surface panels 3 and 4. In the main body 16, the portions that continue from the both ends in the width direction of the projecting piece 18 to the outside in the width direction constitute the engaging portion 16 a (that is, the width direction both ends of the base end edge of the projecting piece 18 and the engaging portion 16 a). There is no gap in between). As a result, as shown in FIG. 4, both side edges of the projecting piece 18 are arranged so as to be continuous with the pair of second locking holes 23, 24 in the assembled state (that is, the width of the projecting piece 18 is assembling state). The distance between the pair of second locking holes 23 and 24 is substantially equal to the above. As a result, in the assembled state, the gap between the main bodies 15 and 16 between the pair of second locking holes 23 and 24 in a plan view is completely closed by the projecting piece 18.

  The width of the projecting piece 18 is larger than the distance between the tips of the first locking holes 21 and 22 of the pair of lid flaps 7 and 8 in the assembled state. As shown in FIGS. 2 and 3, the box sheet has the pair of engaging portions 15 a of the first outer lid flap 4 inserted into the first locking holes 21 and 22 of the pair of inner flaps 7 and 8. Thereafter, the lid is assembled by inserting the pair of engaging portions 16a of the second outer lid flap 6 into the second locking holes 23, 24 of the pair of inner flaps 7, 8. As a result, as shown in FIG. 4, in the box formed by assembling the box sheet, the projecting piece 18 of the second outer lid flap 6 overlaps the upper surface of the projecting piece 17 of the first outer lid flap 5. In the box sheet, the width of the projecting piece 18 of the second lid outer flap 6 is larger than the distance between the tips of the first locking holes 21 and 22 of the pair of lid flaps 7 and 8 in the assembled state. The edges on the inner side (projection piece 17 side) of the pair of engaging portions 15 a of the first lid outer flap 5 are covered with the projecting pieces 18 of the second lid outer flap 6. Thereby, generation | occurrence | production of the clearance gap in the cover part of a box is prevented more reliably, suppressing the detachment | leave from the 1st latching holes 21 and 22 of a pair of engaging part 15a of the 1st lid outer flap 5 fully. be able to.

  The projecting piece 18 has a substantially rectangular shape whose longitudinal direction is the width direction. Both sides in the width direction of the tip edge of the projecting piece 18 are curved. The length of the protruding piece 18 in the protruding direction is not particularly limited, but may be shorter than the protruding direction length of the protruding piece 17 of the first lid outer flap 5. In this case, the ratio of the length in the projecting direction of the projecting piece 18 of the second outer lid flap 6 to the length of the projecting direction 17 of the projecting piece 17 of the first outer flap 5 is, for example, 0.6 or more and 0.9 or less. be able to.

  The pair of engaging portions 16 a are formed at both corners on the distal end side of the main body 16. The pair of first mountain fold lines 20 extends from the width direction both ends of the connecting portion of the second lid outer flap 6 to the second length surface panel 2 (that is, the base end edge of the main body 16) from the tip end edge of the projecting piece 18. It extends over the central part. The pair of first mountain fold lines 20 is formed in a V shape as a whole.

<Flap in the lid>
The pair of lid flaps 7 and 8 are substantially rectangular. The pair of lid flaps 7, 8 is a pair of engagements between the first locking holes 21, 22 into which the pair of engaging portions 15 a of the first lid outer flap 5 are inserted during assembly and the second lid outer flap 6. It has the 2nd locking holes 23 and 24 in which the part 16a is inserted. The first locking holes 21 and 22 are provided on the side adjacent to the first lid outer flap 5 in a state in which the pair of long surface panels 1 and 2 and the pair of width surface panels 3 and 4 are assembled in a square tube shape. The second locking holes 23 and 24 are provided on the side adjacent to the second lid outer flap 6 in a state in which the pair of long surface panels 1 and 2 and the pair of width surface panels 3 and 4 are assembled in a square tube shape. Yes. The first locking holes 21 and 22 and the second locking holes 23 and 24 have an elongated shape that inclines inward in the width direction from the base edge of the in-lid flaps 7 and 8 toward the distal end side. Further, the pair of lid flaps 7 and 8 includes a pair of second peaks extending from both ends in the width direction of the connecting portion with the pair of width surface panels 3 and 4 to the central portion of the front edge of the lid flaps 7 and 8. Fold lines 25 and 26 are provided. In addition, notches 27 and 28 are formed at the leading edges of the pair of lid flaps 7 and 8 so that fingers can be easily applied to the pair of lid flaps 7 and 8 when the article is taken out from the box. May be. Hereinafter, specific configurations of the first lid flap 7 and the second lid flap 8 will be described.

(Flap in the first lid)
As described above, the first inner flap 7 has the first locking hole 21 into which the engaging portion 15a of the first outer flap 5 is inserted and the engaging portion 16a of the second outer flap 6 at the time of assembly. And a second locking hole 23 to be inserted. The base end of the first locking hole 21 is located on one side in the left-right direction of the first lid flap 7 and is curved toward the other side in the left-right direction toward the tip side. On the other hand, the base end of the second locking hole 23 is located on the other side in the left-right direction of the first in-lid flap 7 and is curved toward one side in the left-right direction toward the tip side.

  The first locking hole 21 and the second locking hole 23 have a circular arc shape protruding outward in the width direction of the first lid flap 7, more specifically, a 1/4 circular arc shape. Moreover, the 1st locking hole 21 and the 2nd locking hole 23 are continuous from the other end of slit part 21a, 23a formed by using the base end edge of the flap 1 in 1st lid as one end, and the slit part 21a, 23a. And widened portions 21 b and 23 b that are widened outward in the width direction of the first lid flap 7. The box sheet is engaged by inserting the engaging portions 15a and 16a of the pair of outer lid flaps 5 and 6 into the widened portions 21b and 23b and bending the pair of outer lid flaps 5 and 6 inward. The portions 15a and 16a are locked to the slit portions 21a and 23a. The box sheet has an arc shape in which the first locking hole 21 and the second locking hole 23 are convex outward in the width direction of the first lid flap 7, and is continuous from the other ends of the slit portions 21a and 23a. By having widened portions 21b and 23b widened outward in the width direction of the first lid flap 7, the engaging portions 15a and 16a of the pair of lid flaps 5 and 6 are connected to the first locking hole 21 and the second engagement. It can be easily inserted into the stop hole 23 from the widened portions 21b and 23b. The box sheet includes a pair of slits 21a and 23a in which the first locking hole 21 and the second locking hole 23 are formed with the base edge of the first lid flap 7 as one end. By engaging the engaging portions 15a and 16a of the outer lid flaps 5 and 6 with the slit portions 21a and 23a, the engaging portions 15a and 16a can be securely engaged with the first locking hole 21 and the second locking hole 23. Can be engaged.

  The inner edges of the widened portions 21b and 23b are continuous from the inner edges of the slit portions 21a and 23a. The lengths of the widened portions 21b and 23b are preferably larger than the lengths of the slit portions 21a and 23a. Since the lengths of the widened portions 21b and 23b are relatively large, it is easy to insert the pair of outer lid flaps 5 and 6 into the first locking holes 21 and the second locking holes 23 of the engaging portions 15a and 16a. It becomes. Further, since the lengths of the slit portions 21a and 23a are relatively small, the engagement work of the engagement portions 15a and 16a of the pair of outer lid flaps 5 and 6 with the slit portions 21a and 23a is facilitated.

  The leading end of the first locking hole 21 is located closer to the leading end side of the first lid flap 7 than the leading end of the second locking hole 23. Further, the tips of the first locking hole 21 and the second locking hole 23 are arranged at the center in the width direction of the first lid flap 7. The box sheet has a first locking hole 21 and a second locking hole in which the leading end of the first locking hole 21 is located closer to the leading end of the first lid flap 7 than the leading end of the second locking hole 23b. 23, the first locking hole 21 and the second locking hole in a state where the first locking hole 21 and the second locking hole 23 are not connected to each other by extending to the center in the width direction of the first lid flap 7. The overall length of the hole 23 can be increased. As a result, the box sheet increases the area of the engaging portion 15a of the first outer lid flap 5 and the engaging portion 16a of the second outer lid flap 6 so that these engaging portions 15a and 16a are connected to the first engagement flap 15a. It is easy to reliably engage with the stop hole 21 and the second locking hole 23.

  The pair of second mountain fold lines 25 extends from both ends in the width direction of the base end edge of the first lid flap 7 to the center of the tip edge of the first lid flap 7. The pair of second mountain fold lines 25 is formed in a V shape as a whole.

(Flap in the second lid)
The second lid flap 8 is formed symmetrically with the first lid flap 7. As described above, the second inner flap 8 has the first locking hole 22 into which the engaging portion 15a of the first outer flap 5 is inserted and the engaging portion 16a of the second outer flap 6 at the time of assembly. And a second locking hole 24 to be inserted. The base end of the first locking hole 22 is located on the other side in the left-right direction of the second lid flap 8 and is curved toward one side in the left-right direction toward the tip side. On the other hand, the base end of the second locking hole 24 is located on one side in the left-right direction of the second lid flap 8 and is curved toward the other side in the left-right direction toward the tip side.

  The first locking hole 22 and the second locking hole 24 have a circular arc shape protruding outward in the width direction of the second lid flap 8, more specifically, a 1/4 circular arc shape. Moreover, the 1st locking hole 22 and the 2nd locking hole 24 are continuous from the slit part 22a, 24a formed from the base end edge of the 2nd lid flap 8 as one end, and the other end of slit part 22a, 24a. And widened portions 22b, 24b widened outward in the width direction of the second lid flap 8 in the width direction. The inner edges of the widened portions 22b and 24b are continuous from the inner edges of the slit portions 22a and 24a. The lengths of the widened portions 22b and 24b are preferably larger than the lengths of the slit portions 22a and 24a.

  The front end of the first locking hole 22 is located closer to the front end side of the second lid flap 8 than the front end of the second locking hole 24. The leading ends of the first locking hole 22 and the second locking hole 24 are arranged at the center in the width direction of the second lid lid 8.

  The pair of second mountain fold lines 26 extend from both ends in the width direction of the base end edge of the second lid flap 8 to the central portion of the tip edge of the second lid flap 8. The pair of second mountain fold lines 26 is formed in a V shape as a whole.

<Bottom forming flap>
The four bottom forming flaps 9 to 12 have a so-called one-touch type (simple gluing assembly type) configuration. More specifically, the first bottom forming flap 9 and the third bottom forming flap 11 adjacent to the first bottom forming flap 9 are bonded in advance, and the second bottom forming flap 10 and the second bottom forming flap 10 adjacent to the first bottom forming flap 10 are bonded together. A four-bottom forming flap 12 is bonded in advance. The four bottom forming flaps 9 to 12 have a pair of long surface panels 1 and 2 and a pair of width surface panels in a state where the pair of long surface panels 1 and 2 and the pair of width surface panels 3 and 4 are connected endlessly. 3 and 4 are provided in a folded state. The box sheet is formed by expanding the pair of long surface panels 1 and 2 and the pair of width surface panels 3 and 4 into a rectangular tube shape, so that the first bottom forming flap 9 slides inside the fourth bottom forming flap 12, The second bottom forming flap 10 slides inside the third bottom forming flap 11. This assembles the bottom.

<Assembly procedure of the lid>
With reference to FIGS. 2-4, the assembly procedure of the cover part of the said sheet | seat for boxes is demonstrated. First, as shown in FIG. 2, the pair of lid flaps 7 and 8 are folded inward while being folded at the second mountain fold lines 25 and 26. Further, the pair of engaging portions 15a are inserted into the first locking holes 21 and 22 from the widened portions 21b and 22b by folding the first lid outer flap 7 inward with the first mountain fold line 19 being folded. To do.

  Subsequently, as shown in FIG. 3, the second outer lid flap 6 is folded inward while being folded at the first mountain fold line 20, whereby the pair of engaging portions 16 a is engaged with the second locking holes 23, 24. Are inserted from the widened portions 23b and 24b. Further, by folding the second lid outer flap 6 inward in this state, the pair of engaging portions 15a of the first outer lid flap 5 are engaged with the slit portions 21a, 22a of the first locking holes 21, 22. Then, the pair of engaging portions 16 a of the second lid outer flap 6 engage with the slit portions 23 a and 24 a of the second locking holes 23 and 24. Thereby, the cover part shown in FIG. 4 is assembled.

<Advantages>
In the state where the pair of inner flaps 7 and 8 are folded by the pair of second mountain fold lines 25 and 26, the pair of outer flaps 5 and 6 are paired with the pair of first mountain fold lines 19 and 20. The pair of engaging portions 15a and 16a of the pair of lid outer flaps 5 and 6 are bent to the inside while being folded by the first engagement holes 21 and 22 and the second engagement of the pair of lid flaps 7 and 8, respectively. It can be easily inserted into the stop holes 23 and 24. In addition, the box sheet includes a pair of outer flaps 5 and 6 that are assembled from main bodies 15 and 16 whose front ends are brought into contact with each other in a plan view, and from the center in the width direction of the front end edges of the main bodies 15 and 16. Since the projecting pieces 17 and 18 project, the gap between the front end edges of the main bodies 15 and 16 is hardly generated in a state where the front end edges of the main bodies 15 and 16 are abutted with each other in plan view. Therefore, the box sheet can easily close the lid while suppressing the generation of a gap by engaging the pair of outer flaps 5 and 6 with the pair of inner flaps 7 and 8.

[Other Embodiments]
The said embodiment does not limit the structure of this invention. Therefore, in the above-described embodiment, components of each part of the above-described embodiment can be omitted, replaced, or added based on the description and common general knowledge of the present specification, and they are all interpreted as belonging to the scope of the present invention. Should.

  The first locking hole and the second locking hole do not have to have a circular arc shape protruding outward in the width direction of the in-lid flap, and may be, for example, a linear shape or a polygonal shape. Moreover, it is also possible to employ | adopt the shape which consists only of a slit part, or the shape which consists only of a wide part as said 1st latching | locking part and 2nd latching | locking part.

  The tip end of the first locking hole may not be located closer to the tip end side of the flap in the lid than the tip end of the second locking hole. Moreover, the front-end | tip of a 1st locking hole and a 2nd locking hole may be arrange | positioned in the position shifted | deviated from the width direction center of the flap in a lid | cover. In this case, the front end of the first locking hole is in a state in which the pair of long surface panels and the pair of width surface panels are assembled into a square tube shape, with one lid outer flap ( The first lid outer flap) is preferably disposed on the side, and the tip of the second locking hole is preferably disposed on the other lid outer flap (second lid outer flap) side.

  As described above, the front edge of the main body of one lid outer flap (first lid outer flap) extends outward in the width direction from both ends of the projecting piece and extends beyond the tip of the second locking hole in the assembled state. It is preferable that a pair of existing linear portions is formed. However, in the case where the box sheet can reliably engage the pair of engaging portions of the first outer lid flap and the first locking holes of the pair of inner flaps, the pair of linear portions is not necessarily formed. It does not have to be.

  The box sheet is formed such that the width of the protruding piece of the other lid outside flap (second lid outside flap) is equal to or less than the distance between the tips of the first locking holes of the pair of lid flaps in the assembled state. Is also possible.

  The pair of first mountain fold lines formed on the outer lid flaps may not be formed in a V shape as a whole, and the pair of second mountain fold lines formed on the inner lid flaps as a whole. It does not have to be formed in a V shape. The box sheet may be formed with a pair of first mountain fold lines spaced from each other at the leading edge of the protruding piece of the flap outside the lid, and the pair of second mountain folding at the leading edge of the flap inside the lid. Lines may be formed at intervals.

  The specific structure for forming the bottom of the box of the box sheet is not limited to the structure of the above embodiment. For example, the bottom portion of the box sheet may be formed by one bottom flap extending from the lower edge of one of the long surface panels.

  As described above, the box sheet according to the present invention can easily close the lid while suppressing the generation of a gap by engaging the pair of lid flaps with the pair of lid flaps. Suitable for storage of goods.

DESCRIPTION OF SYMBOLS 1 1st length surface panel 2 2nd length surface panel 3 1st width surface panel 4 2nd width surface panel 5 1st lid outer flap 6 2nd lid outer flap 7 1st lid flap 8 2nd lid flap 9 1st 1 bottom forming flap 10 2nd bottom forming flap 11 3rd bottom forming flap 12 4th bottom forming flap 13 glue margins 15 and 16 main bodies 15a and 16a engaging portions 15b linear portions 17 and 18 projecting pieces 19 and 20 first mountain fold Lines 21 and 22 First locking holes 21a and 22a Slit portions 21b and 22b Widened portions 23 and 24 Second locking holes 23a and 24a Slit portions 23b and 24b Widened portions 25 and 26 Second mountain fold lines 27 and 28 Notches

Claims (5)

It consists of one sheet,
A pair of long surface panels and a pair of width surface panels that are alternately connected in the left-right direction and assembled into a square cylinder;
A pair of outer lid flaps extending from the upper edges of the pair of length surface panels;
A pair of lid flaps extending from the upper edges of the pair of width surface panels, and a box sheet that can be assembled into a box shape,
The pair of outer lid flaps has a substantially rectangular main body whose front ends are abutted in plan view in an assembled state, and a projecting piece protruding from the center in the width direction of the front end edge of the main body,
The main body has a pair of engaging portions at the tip portions on both sides in the width direction,
The pair of lid flaps includes a first locking hole into which an engaging portion of one of the lid outer flaps is inserted during assembly and a second locking hole into which the engaging portion of the other outer lid flap is inserted. Have
The first locking hole and the second locking hole have an elongated shape that inclines inward in the width direction from the proximal end side to the distal end side of the lid flap.
The pair of lid outer flaps has a pair of first mountain fold lines extending from both ends in the width direction of the connecting portion with the pair of long surface panels to the center of the tip edge of the protruding piece,
The box sheet in which the pair of lid flaps has a pair of second mountain fold lines extending from both ends in the width direction of the connecting portion with the pair of width surface panels to a central portion of a front end edge of the lid flap. The first locking hole and the second locking hole have a circular arc shape protruding outward in the width direction of the in-lid flap,
The first locking hole and the second locking hole are continuous from the other end of the slit portion formed with the base end edge of the flap in the lid as one end, and the widthwise outer side of the flap in the lid The box sheet according to claim 1, further comprising a widened portion widened. The tip of the first locking hole is located on the tip side of the flap in the lid from the tip of the second locking hole;
The box seat according to claim 1 or 2, wherein tips of the first locking hole and the second locking hole are arranged at a center in a width direction of the lid flap.   A pair of straight portions extending outward in the width direction from both ends of the projecting piece are formed at the distal end edge of the main body of the one lid outer flap, and the straight portions extend beyond the distal end of the second locking hole in an assembled state. The box sheet according to claim 3 which extends.   The box seat according to claim 3 or 4, wherein a width of the protruding piece of the other lid outer flap is larger than a distance between tips of the first locking holes of the pair of lid flaps in the assembled state.

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