JP2009096540A - Carton box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make hooking hard to occur between top and bottom boxes, to make a recess hard to be generated on a lid surface even when an article is placed on the top, and in addition, to make a material layout easy to perform, to make the positioning in bending easy to perform as well, and to enable the productivity to be increased as a result. <P>SOLUTION: This carton box 10 is built up into a rectangular parallelepiped shape by bending side plates, a lid plate and a bottom plate. In the carton box 10, on the butting end edge 43a of a third lid plate 43, an insertion piece 45 is projected. The butting end edge 41a of a first lid plate 41 is constituted of a ridge folding section 48 when a reinforcing plate 46 connected with the distal end is bent inward in a manner to be stacked on the lower surface of the lid plate. Then, an insertion port 50 is formed on the ridge folding section 48. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rectangular parallelepiped corrugated cardboard box for use in logistics.

  As a conventional example of this type of cardboard box, one shown in FIG. 6 is known (for example, see Patent Document 1).

  This corrugated cardboard box 110 is formed in a single unfolded state by corrugated cardboard, and four side plates 121 to 124 connected in a row are bent inward to form four side surfaces, and the upper ends of the side plates 121 to 124 are formed. A cover surface is formed by bending the four cover plates 141 to 144 connected to the side inward, and the four bottom plates 131 to 134 connected to the lower end sides of the side plates 121 to 124 are bent inward. Thus, the bottom surface is configured, and the bottom surface is thereby assembled.

  An insertion piece 145 protrudes from the leading edge of one pair of opposed cover plates 142 and 144, and an insertion port 150 into which the insertion piece 145 is inserted is provided in the other opposed pair of cover plates 141 and 143. ing. Moreover, the notch 131a, 133a mutually engaged is provided in the front-end edge of a pair of opposing baseplate 131,133.

  When storing an object in the cardboard box 110, first, the four side plates 121 to 124 are bent inward, the adjacent side edges of the first and last side plates 121 and 124 are joined, and then the four side plates 121 to 124 are joined. The bottom plates 131 to 134 are bent inward and engaged with the notches 131a and 133a while alternately engaging with each other, thereby forming a side surface and a bottom surface.

  Then, the objects to be stored are accommodated, and then the other pair of opposite cover plates 141 and 143 are folded inward and closed, and the one pair of opposite cover plates 142 and 144 are folded inward and closed. By inserting the insertion piece 145 at the tip of the cover plates 142 and 144 stacked on the upper side into the insertion port 150 of the lower cover plates 141 and 143, the cover surface is closed and the packaging is completed.

  By the way, in the case of this cardboard box 110, since a level | step difference is easy to be made on a cover surface, when the cardboard box 110 is stacked on top, the following malfunction may arise. That is, when the upper cardboard box 110 is slid in the horizontal direction while being stacked, the steps on the lid surface of the lower cardboard box 110 and the edges of the bottom plates 131 to 134 on the bottom surface of the upper cardboard box 110 are caught. For this reason, in particular, a problem that the edges of the bottom plates 131 to 134 are bent easily occurs.

  As a result of examining the reason why a step is likely to be formed on the lid surface, in this cardboard box 110, the insertion port 150 formed directly on the lid plates 141, 143 is connected to another lid plate 142, 144. Although it is structured to insert the formed insertion piece 145, at the time of insertion, the insertion piece 145 is inserted obliquely, and due to this, the edges of the cover plates 142, 144 are likely to float, It was found that there was a step due to the edge.

  As a corrugated cardboard box that can avoid such a problem of catching, as shown in FIG. 7, a corrugated cardboard box 210 having a single uppermost cover plate 241 is known (for example, Patent Document 2). reference). FIG. 8 is a development view thereof.

  This corrugated cardboard box 110 is formed in a single unfolded state by corrugated cardboard, and four side plates 221 to 224 connected in a row are bent inward to form four side surfaces. The upper ends of the side plates 221 to 224 A cover surface is formed by bending the four cover plates 241 to 244 connected to the side inward, and the four bottom plates 231 to 234 connected to the lower end sides of the side plates 221 to 224 are bent inward. Thus, the bottom surface is configured, and the bottom surface is thereby assembled. A joining margin 225 is provided on the side edge of the first side plate 221 among the side plates 221 to 224 arranged in a line.

  Notches 231a and 233a that engage with each other are provided at the tip edges of the pair of opposed bottom plates 231 and 233. Moreover, the cover plate 241 that is closed to the uppermost surface is configured as a single sheet that covers the entire area of the cover surface, and a first insertion piece 245 having a second insertion port 246 at the root portion at the tip edge thereof. Is protruding. In addition, a first insertion port 248 into which the first insertion piece 245 is inserted is provided at the base of the lid plate 243 facing the lid plate 241 so as to straddle the first insertion port 248. Further, a second insertion piece 247 is formed by making a U-shaped cut in a range from the cover plate 243 to the side plate 223 where the cover plate 243 is continuously provided. Note that the cover plates 242 to 244 other than the cover plate 241 that is closed to the uppermost surface are simply formed as flaps having small dimensions.

  In order to store an object in the cardboard box 210, first, the four side plates 221 to 224 are bent inward, and the side edges of the first and last side plates 121 and 124 are joined together using a joining margin 225. The four bottom plates 231 to 234 are bent inwardly, and the notches 231a and 233a are engaged while alternately engaging with each other, thereby forming the side surface and the bottom surface.

Then, the objects to be stored are accommodated, and then the flap-shaped lid plates 242 to 244 with small dimensions are folded inward and closed, and the lid plate 241 with large dimensions is folded inward from above and closed to the top surface. The first insertion piece 245 at the tip of the lid plate 241 is inserted into the first insertion port 248 at the base of the opposite lid plate 243. Next, the second insertion piece 247 is inserted into the second insertion port 246 at the base of the first insertion piece 245 that has been inserted first in the form of an L-shaped cross section, so that the first insertion piece 245 is removed. Stop. This completes boxing.
JP 58-134850 A (FIG. 1) Japanese Patent Laying-Open No. 2005-267462 (FIG. 16)

  Since the cardboard box 210 shown in FIGS. 7 and 8 has a flat lid surface, the upper and lower cardboard boxes 210 are not caught even when the cardboard boxes 210 are stacked and slid in the horizontal direction.

  However, in order to flatten the lid surface, the uppermost lid plate 241 is a single plate that covers the entire integral of the lid surface, so that only one lid plate 241 is large and the other lid plates 242 to 244 are large. There is a problem that the dimensions become non-uniform and the material removal becomes worse.

  That is, since the distance T4 from the base of the lid plate 241 closed to the top surface to the tip edge of the insertion piece 245 is the maximum dimension, the total dimension T is obtained by adding the dimension T1 of the side plates 221 to 224 and the dimension T2 of the bottom plates 231 to 234. However, since the other cover plates 242 to 244 are limited to the minimum dimension T3, they are not uniform with the dimension T4 of the cover plate 241 and are wasteful and inefficient. It becomes material picking.

  In addition, since the dimensions are not uniform, it is difficult to align the side plates 221 to 224 when they are bent, resulting in a problem that productivity is deteriorated.

  Further, both the cardboard box 110 shown in FIG. 6 and the cardboard box 210 shown in FIGS. 7 and 8 have insufficient lid surface strength, and the lid surface may be recessed when an object is placed thereon.

  In consideration of the above-mentioned circumstances, the present invention is less likely to be caught between the upper and lower boxes even when the upper box is slid horizontally in a stacked state, and even when an object is placed on the upper box. It is an object of the present invention to provide a corrugated cardboard box in which the cover surface is hard to be dented, the material can be easily taken, the positioning at the time of folding is easy, and the productivity can be improved as a result.

  According to the first aspect of the present invention, four side plates formed by corrugated cardboard in a single unfolded state are bent inward to form four side surfaces, and are provided continuously at the upper end sides of the side plates. The lid surface is constructed by folding the four lid plates inward, and the bottom surface is constructed by folding the four bottom plates connected to the lower edge of each side plate inward, thereby forming a rectangular parallelepiped shape. In the assembled cardboard box, a pair of opposed cover plates that are bent to the uppermost surface are provided with butt edges that face each other when the pair of cover plates are closed, and one of the pair of cover plates The insertion piece projects from the abutting edge of the lid plate, and the abutting edge of the other lid plate is provided with an insertion port into which the insertion piece is inserted. The reinforcing plate connected to the front end of the lid plate is formed by a mountain fold when folded inward so as to overlap the lower surface of the lid plate, and the insertion port is formed in the mountain fold. And

  The invention according to claim 2 is the corrugated cardboard box according to claim 1, wherein the mountain fold portions are formed in parallel with each other at a distance corresponding to the thickness of the cardboard. The reinforcing plates are formed by bending the reinforcing plates substantially at right angles.

  The invention of claim 3 is the corrugated cardboard box according to claim 2, wherein the first folding line located on the first mountain fold line on the lid plate side is provided in the mountain fold portion, and the first A U-shaped notch is provided which includes a second notch line formed from both ends of the notch line to a second mountain fold line on the reinforcing plate side in a direction orthogonal to the first notch line. When the reinforcing plate is folded at the first and second mountain fold lines so as to overlap the lower surface of the lid plate, the insertion port is opened by opening the U-shaped cut, A rectangular plate-shaped portion surrounded by the first and second cut lines is cut off from the lid plate, so that the lower side of the insertion port protrudes from the mountain fold and is flush with the reinforcing plate. A receiving piece for insertion guide is formed.

  Invention of Claim 4 is a cardboard box of any one of Claims 1-3, Comprising: For the side edge of the base part side of the said insertion piece, For the lock | rock engaged with the side edge of the said insertion port A notch is provided.

  Invention of Claim 5 is a corrugated cardboard box of any one of Claims 1-4, Comprising: A pair of said cover plates located in the lower side of the cover plate used as the uppermost surface, Abutting edges that face each other close to each other when the pair of cover plates are closed are provided, and at least one of these abutting edges is provided with a notch for inserting a finger or the like.

  Invention of Claim 6 is the cardboard box of any one of Claims 1-5, Comprising: The distance from the base part of the cover plate which has the said insertion piece in the expansion | deployment state to the front-end edge of the said insertion piece The distance from the base of the lid plate having the reinforcing plate to the leading edge of the reinforcing plate and the distance from the base of the remaining two lid plates to the leading edges are set substantially uniformly. And

  According to the first aspect of the present invention, when the reinforcing plate is bent on the lower side of the lid plate, the lid plate has a double structure with the reinforcing plate, so that the strength of the lid surface is increased and an object is placed thereon. Indentation of the lid surface can be prevented.

  Moreover, since the insertion port is not provided directly in the lid plate itself but in the mountain fold portion formed when the reinforcing plate is folded under the lid plate, the insertion piece on the other side is attached to the lid plate or It can be inserted into the insertion port in parallel with the reinforcing plate. Therefore, when the insertion piece is inserted into the insertion port provided on the cover plate as in the prior art, the insertion piece is inevitably inserted at an angle, so that the edge of the cover plate rises. It was easy to cause a step on the bottom surface of the upper cardboard box and catching it when other cardboard boxes were stacked on top of each other, but this can be solved. In other words, by inserting the insertion piece approximately parallel to the cover plate, it is possible to prevent the edge of the cover plate from being lifted, and even when other cardboard boxes are slid in a stacked state, It is possible to eliminate as much as possible the catch on the bottom of the cardboard box.

  Moreover, by eliminating the above-described problem of catching, the engaging portion formed by the insertion piece and the insertion opening can be arranged at the center of the lid surface. Thereby, the dimension from the base part of a cover plate to the front-end | tip (the front-end edge is what has an insertion piece, and the front-end edge has a reinforcement board) can be made uniform. Therefore, it is possible to reduce the waste of material collection, and when assembling the cardboard box, it is possible to assemble accurately and easily based on the leading edge of the cover plate and the leading edge of the bottom plate, thereby improving productivity. I can plan.

  According to the invention of claim 2, since the mountain fold portion is formed by the first and second mountain fold lines formed at an interval corresponding to the thickness of the cardboard, the thickness of the cardboard at the mountain fold portion. A considerable height can be provided. Therefore, the height of the insertion slot can be ensured to be equivalent to the thickness of the insertion piece, and the insertion piece can be easily inserted into the insertion slot. Further, since the mountain fold portion has a U-shaped cross section having a flat end surface, it is possible to easily form an insertion port on the flat end surface.

  According to invention of Claim 3, since the U-shaped notch which consists of a 1st notch line and a 2nd notch line is put in the mountain fold part of a reinforcement board, by inserting a reinforcement board, an insertion port Can be opened. In addition, since the first cut line of the U-shaped cut is formed on the first mountain fold line on the lid plate side, when the reinforcing plate is bent, it is separated from the connecting portion with the lid plate. Therefore, the rectangular plate-shaped portion surrounded by the U-shaped notch protrudes from the mountain fold portion on the reinforcing plate side and remains as a receiving piece in the same plane as the reinforcing plate. In other words, a receiving piece whose height matches the lower end edge of the insertion opening is formed below the insertion opening. Therefore, it becomes possible to guide the insertion piece to the insertion port by using the receiving piece as a guide, and it becomes easy to insert. For example, if there is no receiving piece, the insertion piece must be inserted into the insertion slot while searching for the vertical position, but if there is a reception piece below the insertion opening as in the present invention, The insertion piece can be inserted into the insertion opening so as to slide on. For this reason, it can insert smoothly and can perform lid closing operation easily.

  According to the invention of claim 4, when the insertion piece is inserted into the insertion opening as far as the root, the notch engages with the side edge of the insertion opening, so that the insertion piece can be prevented from coming off, and unnecessary opening of the lid surface can be prevented. Can be prevented.

  According to the invention of claim 5, since the abutting edges are also abutted with each other for the pair of lower lid plates, the entire upper lid plate can be supported by the lower lid plate. The strength of the surface can be increased. Moreover, since the notch was provided in the butt | matching edge of the lower cover board, a cover board can be easily opened by putting a finger etc. in the notch in the state which closed the cover board.

  According to invention of Claim 6, since the dimension from the base part of a cover plate to the front-end | tip is equalized, while being able to reduce waste of material collection, when assembling a cardboard box, the front-end edge and bottom plate of a cover plate Therefore, it is possible to assemble accurately and easily with reference to the leading edge of the head, thereby improving productivity.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is a developed view of the cardboard box of the embodiment, FIG. 2 is a perspective view showing a state in the middle of assembling the cardboard box, FIG. 3 is a perspective view showing a state in which the lid of the cardboard box is being closed, and FIG. FIG. 5 is a cross-sectional view of the engagement portion between the insertion piece and the insertion opening in the cardboard box.

  This corrugated cardboard box 10 is formed in a single unfolded state by corrugated cardboard, and the first to fourth four side plates 21 to 24 connected in a row are folded inward by hinge portions 21c, 23d and 23c. Four side surfaces are configured, and the first to fourth four cover plates 41 to 44 connected to the upper end sides of the side plates 21 to 24 are bent inward by the hinge portions 21a, 22a, 23a, and 24a. A cover surface is formed, and the bottom surface is formed by bending the first to fourth bottom plates 31 to 34 connected to the lower end sides of the side plates 21 to 24 inwardly by hinge portions 21b, 22b, 23b, and 24b. It is comprised and is assembled in a rectangular parallelepiped shape by it. A joint margin 25 is provided on the side edge of the first side plate 21 among the side plates 221 to 224 arranged in a row via a hinge portion 21d.

  Trapezoidal cutouts 31a and 33a that are engaged with each other are provided at the front end edges of the first bottom plate 31 and the third bottom plate 33 that are opposed to each other. Hinge portions 31c and 33c are provided to facilitate bending of the triangular portions 31b and 33b at the tip when all the bottom plates 31 to 34 are engaged with each other. Note that notches 31d and 33d are formed at the bases of the triangular portions 31b and 33b so as to be easily bent by the hinge portions 31c and 33c.

  The first lid plate 41 and the third lid plate 43 are lid plates that are folded to the uppermost surface, and the lid plates 41 and 42 that are folded to the uppermost surface face each other when the lid plates 41 and 44 are closed. Butt edges 41a, 43a facing each other are provided. The abutting edge 41 a of the first lid plate 41 is configured by a mountain fold portion 48 when the reinforcing plate 46 provided continuously to the tip of the lid plate 41 is folded inward so as to overlap the lower surface of the lid plate 41. ing.

  In addition, two insertion pieces 45 are spaced from each other at the butting edge 43a of the third lid plate 43, which is one of the two first and third lid plates 41 and 43. It is protruding. In addition, an insertion port 50 into which the insertion piece 45 is inserted is provided at the abutting end edge of the first lid plate 41 which is the other lid plate.

  Since the butt edge 41 a of the first lid plate 41 is formed by the mountain fold portion 48, the insertion port 50 is formed in the mountain fold portion 48.

  In this case, the mountain folds 48 are formed by bending the reinforcing plate 46 at substantially right angles with the first and second mountain fold lines 48a and 48b that are parallel to each other and are formed at an interval H corresponding to the thickness of the cardboard. Has been.

  The mountain fold portion 48 includes a first cut line 47a located on the first mountain fold line 48a on the cover plate 41 side, and orthogonal to the first cut line 47a from both ends of the first cut line 47a. A U-shaped notch 47 is provided, which includes a second notch line 47b formed up to the second mountain fold line 48b on the reinforcing plate 46 side.

  When the reinforcing plate 46 is folded so as to overlap the lower surface of the lid plate 41 at the first and second mountain fold lines 48a and 48b, the U-shaped cut 47 is opened as shown in FIG. At the same time, the rectangular plate-like portion surrounded by the first and second cut lines 47a and 47b is cut off from the cover plate 41, so that the mountain fold is formed below the insertion port 50. A receiving piece 51 that protrudes from 48 and is flush with the reinforcing plate 46 is formed.

  Further, a locking notch 45 a that engages with the side edge of the insertion port 50 is provided on the side edge on the base side of the insertion piece 45. Further, on the outside of the second cut line 47b of the U-shaped cut 47 forming the insertion port 50, an insertion piece 45 having a lockable width (a slightly larger width than the insertion port 50) is provided. 50 is provided with a small cut 47c for smooth insertion.

  Further, the second and fourth lid plates 42 and 44 located below the first and third lid plates 41 and 43 which are the uppermost surfaces are also mutually connected when the lid plates 42 and 44 are closed. Abutting end edges 42a and 44a facing each other are provided, and a semicircular notch 49 for inserting a finger or the like is provided on the abutting end edges 42a and 44a. It should be noted that it is only necessary that either one of the lid plates 42 and 44 has a notch 49.

  Further, the cardboard box 10 configured as described above is, in the unfolded state, the distance from the base portion of the third lid plate 43 having the insertion piece 45 to the tip edge of the insertion piece 45 and the first plate having the reinforcing plate 46. The distance from the base part of the cover plate 41 to the front end edge of the reinforcing plate 46 and the distance from the base parts of the remaining two cover plates 42 and 44 to the respective front end edges are set to a substantially uniform dimension S3. Therefore, the material can be formed without waste from the corrugated cardboard having the overall dimension S obtained by adding the dimension S1 of the side plates 21 to 24 and the dimension T2 of the bottom plates 41 to 44.

  A hinge portion 43b that is bent when the insertion piece 45 is inserted into the insertion hole 50 is provided midway from the base portion to the tip end of the third lid body 43, and the hinge portion 43b is provided at both ends of the hinge portion 43b. A notch 43c is provided to facilitate bending.

  In order to store objects in the cardboard box 10, first, the four side plates 21 to 24 are folded inward by the hinge portions 21 c, 23 d, 23 c, and 21 d, and the side edges of the start and end side plates 21, 24 are connected to each other. Next, the four bottom plates 31 to 34 are bent inward and the notches 31a and 33a are engaged with each other while engaging with each other, thereby forming a side surface and a bottom surface.

  Then, the second lid plate 42 and the fourth lid plate 44 having dimensions are folded inwardly by the hinge portions 22a and 24a and closed, and the first lid plate 41 and the first lid plate 41 are then closed. The third lid plate 43 is folded inward by the hinge portions 21a and 23a and closed.

  At that time, the reinforcing plate 46 connected to the tip of the first lid plate 41 is mountain-folded inward at the first and second mountain fold lines 48a and 48b, whereby the reinforcing plate 46 is The cover plate 41 is bent toward the lower surface side. By doing so, the lid plate 41 has a double structure with the reinforcing plate 46. Further, by bending the reinforcing plate 46 in this manner, as shown in FIG. 3, the insertion port 50 is opened by opening the U-shaped cut 47, and at the same time, the first and second cut lines 47a, 47b. When the rectangular plate-shaped portion surrounded by is cut off from the cover plate 41, it remains as a receiving piece 51 that protrudes from the mountain fold portion 48 and is flush with the reinforcing plate 46 below the insertion port 50.

  Therefore, the two insertion pieces 45 are inserted into the respective insertion openings 50 while the third lid plate 43 is bent at the hinge part 43b in the middle (see FIG. 5). If it does so, the notch 45a of the insertion piece 45 will engage with the both-sides edge of the insertion port 50, and the insertion piece 45 will be locked out. Thereby, it will be in the state of FIG. 4 and boxing will be completed.

  In the case of this cardboard box 10, the lid plate 41 has a double structure with the reinforcing plate 46 by bending the reinforcing plate 46 below the first lid plate 41, so that the strength of the lid surface is increased and It is possible to prevent the lid surface from being depressed when an object is placed thereon.

  In addition, the insertion port 50 is not provided directly in the first cover plate 41 itself, but the insertion port 50 is provided in the mountain fold portion 48 formed when the reinforcing plate 46 is bent under the cover plate 41. As shown in FIG. 5, the mating insertion piece 45 can be inserted into the insertion port 50 in parallel with the cover plate 41 and the reinforcing plate 46. Therefore, as in the conventional example shown in FIG. 6, when the insertion piece 145 is inserted into the insertion port 150 provided on the cover plates 141 and 143, the insertion piece 145 is inevitably inserted obliquely. When the other cardboard boxes are stacked on top of each other, the edges of the cover plates 142 and 144 may be lifted, which tends to cause a step on the bottom surface of the upper cardboard box. Can be eliminated.

  That is, by inserting the insertion piece 45 substantially parallel to the lid plate 41, the end edge of the lid plate 41 can be prevented from rising, and when the other cardboard boxes are slid in a stacked state, However, it is possible to eliminate the catching with the bottom surface of the upper cardboard box 10 as much as possible.

  Further, by solving the above-mentioned problem of catching, the engaging portion by the insertion piece 45 and the insertion port 50 can be arranged at the center of the lid surface as in this embodiment. Thereby, it is possible to make the dimension S3 uniform from the base of the cover plates 41 to 44 to the tip (the tip edge is provided with the insertion piece 45, and the tip edge is provided with the reinforcing plate 46). Therefore, waste of material collection can be reduced, and when assembling the cardboard box, the leading edges of the cover plates 41 to 44 and the leading edges of the bottom plates 31 to 34 are set as the reference M1, M2 (see FIG. 1), Assembling can be performed accurately and easily, and productivity can be improved.

  Further, the mountain fold portion 48 is formed by the first and second two mountain fold lines 48a and 48b formed at an interval H corresponding to the thickness of the corrugated cardboard, so that the corrugated cardboard has a thickness corresponding to the thickness of the corrugated cardboard. Can be provided. Accordingly, the height of the insertion port 50 can be ensured to be equivalent to the thickness of the insertion piece 45, and the insertion piece 45 can be easily inserted into the insertion port 50. Further, since the mountain fold portion 48 has a U-shaped cross section having a flat end surface, the insertion port 50 can be easily formed on the flat end surface.

  Further, since the U-shaped cut 47 composed of the first cut line 47a and the second cut line 47b is provided in the mountain fold portion 48 of the reinforcing plate 46, the insertion port 50 is formed by bending the reinforcing plate 46. Can be opened. Further, since the first cut line 47a of the U-shaped cut 47 is formed on the first mountain fold line 48a on the cover plate 41 side, when the reinforcing plate 46 is bent, The rectangular plate-like portion surrounded by the U-shaped cut 47 protrudes from the mountain fold portion 48 on the reinforcing plate 46 side and forms the same plane as the reinforcing plate 46. Thus, it remains as a receiving piece 51. In other words, the receiving piece 51 whose height coincides with the lower end edge of the insertion port 50 is formed below the insertion port 50. Therefore, as shown in FIG. 50, the insertion piece 45 can be guided to the insertion port 50 by using the receiving piece 51 as a guide, which facilitates insertion.

  For example, when the receiving piece 51 is not provided, the insertion piece 45 must be inserted into the insertion opening 50 while searching for the position in the vertical direction. However, the reception piece 51 is provided below the insertion opening 50 as in the present embodiment. In some cases, the insertion piece 45 can be inserted into the insertion opening 50 by sliding on the receiving piece 51. For this reason, it can insert smoothly and can perform lid closing operation easily.

  Further, when the insertion piece 45 is inserted into the insertion opening 50 to the root, the notches 45a engage with both side edges of the insertion opening 50, so that the insertion piece 45 can be prevented from coming off and unnecessary opening of the lid surface can be prevented. .

  Further, the second and fourth lid plates 42 and 44 that are closed to the lower side are also abutted against each other, so that the entire first and third lid plates 41 and 43 on the upper side. Can be supported by the lower second and fourth lid plates 42 and 44, and the strength of the lid surface can be increased. Further, since the notches 49 are provided in the butted end edges 42a, 44a of the lower second and fourth lid plates 42, 44, a finger or the like is put into the notches 49 with the lid plates 42, 44 closed. Thus, the lid plates 42 and 44 can be easily opened.

  Moreover, in this embodiment, since the dimension from the base part to the front-end | tip of the cover plates 41-44 was made uniform, while being able to reduce the waste of material collection, when assembling a cardboard box, the cover plates 41-44 With reference to the leading edge and the leading edges of the bottom plates 31 to 34, assembly can be performed accurately and easily, and productivity can be improved.

It is an expanded view of the cardboard box of the embodiment of the present invention. It is a perspective view which shows the state in the middle of the assembly of the cardboard box. It is a perspective view which shows the state which is going to close the cover of the cardboard box. It is a perspective view which shows the state which closed the cover of the cardboard box. It is sectional drawing of the engaging part of the insertion piece and insertion slot in the cardboard box. It is a perspective view which shows an example of the conventional cardboard box. It is a perspective view which shows the other example of the conventional cardboard box. It is an expanded view of the cardboard box of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cardboard box 21-24 Side plate 31-34 Bottom plate 41-44 Cover plate 41a-44a Butting edge 45 Insertion piece 45a Notch for lock 46 Reinforcement plate 47 U-shaped cut 47a 1st cut line 47b 2nd cut Line 48 Mountain fold portion 48a First mountain fold line 48b Second mountain fold line 49 Notch 50 Insert 51 Receiving piece

According to the first aspect of the present invention, four side plates formed by corrugated cardboard in a single unfolded state are bent inward to form four side surfaces, and are provided continuously at the upper end sides of the side plates. The lid surface is constructed by folding the four lid plates inward, and the bottom surface is constructed by folding the four bottom plates connected to the lower edge of each side plate inward, thereby forming a rectangular parallelepiped shape. In the assembled cardboard box, a pair of opposed cover plates that are bent to the uppermost surface are provided with butt edges that face each other when the pair of cover plates are closed, and one of the pair of cover plates The insertion piece projects from the abutting edge of the lid plate, and the abutting edge of the other lid plate is provided with an insertion port into which the insertion piece is inserted. , Constituted by the mountain-folded portion when bending the reinforcing plate provided continuously to the tip of the lid plate on the inside so as to overlap the lower surface of the lid plate, the mountain-folded portion, to form the said spigot, said A receiving guide for insertion guide is formed below the insertion port .

Moreover, since the insertion port is not provided directly in the lid plate itself but in the mountain fold portion formed when the reinforcing plate is folded under the lid plate, the insertion piece on the other side is attached to the lid plate or It can be inserted into the insertion port in parallel with the reinforcing plate. Therefore, when the insertion piece is inserted into the insertion port provided on the cover plate as in the prior art, the insertion piece is inevitably inserted at an angle, so that the edge of the cover plate rises. It was easy to cause a step on the bottom surface of the upper cardboard box and catching it when other cardboard boxes were stacked on top of each other, but this can be solved. In other words, by inserting the insertion piece approximately parallel to the cover plate, it is possible to prevent the edge of the cover plate from being lifted, and even when other cardboard boxes are slid in a stacked state, It is possible to eliminate as much as possible the catch on the bottom of the cardboard box. In particular, since the insertion guide receiving piece is formed under the insertion opening, the insertion piece can be smoothly inserted into the insertion opening by sliding on the insertion guide receiving piece, and the lid is closed. The operation can be performed easily and reliably, and the insertion guide receiving piece is not exposed to the outside of the cover plate, and even when another cardboard box is slid in a stacked state, It is possible to reliably eliminate the catch on the bottom surface of the cardboard box.

In addition, two insertion pieces 45 are spaced from each other at the butting edge 43a of the third lid plate 43, which is one of the two first and third lid plates 41 and 43. It is protruding. Further, an insertion port 50 into which the insertion piece 45 is inserted is provided at the butting edge 41a of the first lid plate 41 which is the other lid plate.

That is, as shown in FIGS. 4 and 5, by inserting the insertion piece 45 substantially parallel to the cover plate 41, the edge of the cover plate 41 can be prevented from being lifted, and other cardboard boxes can be raised. Even when it is slid in a stacked state, it is possible to eliminate the catching with the bottom surface of the upper cardboard box 10 as much as possible. In particular, since the insertion guide receiving piece 51 that protrudes from the mountain fold 48 and is flush with the reinforcing plate 46 is formed on the lower side of the insertion opening 50, the insertion guide receiving piece 51 is slid on the insertion guide receiving piece 51. Thus, the insertion piece 45 can be smoothly inserted into the insertion port 50, and the closing operation of each lid plate 41, 43 can be performed easily and reliably, and the insertion guide receiving piece 51 is provided with each lid plate 41, 43. Even when the other cardboard boxes are slid in a stacked state without being exposed to the outside of the cardboard box, the hooking with the bottom surface of the upper cardboard box 10 can be reliably eliminated.

According to the first aspect of the present invention, four side plates formed by corrugated cardboard in a single unfolded state are bent inward to form four side surfaces, and are provided continuously at the upper end sides of the side plates. The lid surface is constructed by folding the four lid plates inward, and the bottom surface is constructed by folding the four bottom plates connected to the lower edge of each side plate inward, thereby forming a rectangular parallelepiped shape. In the assembled cardboard box, a pair of opposed cover plates that are bent to the uppermost surface are provided with butt edges that face each other when the pair of cover plates are closed, and one of the pair of cover plates The insertion piece projects from the abutting edge of the lid plate, and the abutting edge of the other lid plate is provided with an insertion port into which the insertion piece is inserted. A reinforcing plate connected to the tip of the lid plate is formed by a mountain fold when folded inward so as to overlap the lower surface of the lid plate, and the insertion port is formed in the mountain fold, An insertion guide receiving piece is formed below the insertion opening , and insertion insertion cuts are provided on both sides of the insertion opening .

Moreover, since the insertion port is not provided directly in the lid plate itself but in the mountain fold portion formed when the reinforcing plate is folded under the lid plate, the insertion piece on the other side is attached to the lid plate or It can be inserted into the insertion port in parallel with the reinforcing plate. Therefore, when the insertion piece is inserted into the insertion port provided on the cover plate as in the prior art, the insertion piece is inevitably inserted at an angle, so that the edge of the cover plate rises. It was easy to cause a step on the bottom surface of the upper cardboard box and catching it when other cardboard boxes were stacked on top of each other, but this can be solved. In other words, by inserting the insertion piece approximately parallel to the cover plate, it is possible to prevent the edge of the cover plate from being lifted, and even when other cardboard boxes are slid in a stacked state, It is possible to eliminate as much as possible the catch on the bottom of the cardboard box. In particular, the insertion guide receiving piece is formed below the insertion slot , and the insertion insertion cuts are provided on both sides of the insertion slot. The insertion piece can be smoothly inserted into the insertion opening through the insertion cut and can be inserted deeply and easily, and the closing operation of the lid can be easily and reliably performed. Even when the other cardboard boxes are slid in a stacked state without being exposed to the outside of the cover plate, it is possible to reliably eliminate the catching with the bottom surface of the upper cardboard box.

Further, a locking notch 45 a that engages with the side edge of the insertion port 50 is provided on the side edge on the base side of the insertion piece 45. In addition, the outer side of the second cut line 47b of the U-shaped cut 47 forming the insertion port 50 (on both sides of the insertion port 50) had a lockable width (a slightly larger width than the insertion port 50). A small insertion insertion notch 47 c is provided to allow the insertion piece 45 to be smoothly inserted into the insertion opening 50.

That is, as shown in FIGS. 4 and 5, by inserting the insertion piece 45 substantially parallel to the cover plate 41, the edge of the cover plate 41 can be prevented from being lifted, and other cardboard boxes can be raised. Even when it is slid in a stacked state, it is possible to eliminate the catching with the bottom surface of the upper cardboard box 10 as much as possible. In particular, an insertion guide receiving piece 51 that protrudes from the mountain fold portion 48 and is flush with the reinforcing plate 46 is formed below the insertion port 50, and insertion insertion cuts 47 c are formed on both sides of the insertion port 50. since there is provided, it is possible to deeply easily inserted and inserted smoothly through the notch 47c for inserting plug into to insertion piece 45 of the receptacle 50 so as to slide over the receiving piece 51 for insertion guide, the The closing operation of the cover plates 41 and 43 can be performed easily and reliably, and the receiving guide 51 for insertion guide is not exposed outside the cover plates 41 and 43, and other cardboard boxes are stacked on top. Even when the cardboard box is slid in the closed state, the catching with the bottom surface of the upper cardboard box 10 can be reliably eliminated.

Claims (6)

Four lid plates formed in a single unfolded state by corrugated cardboard and configured to have four side surfaces formed by bending inwardly four side plates arranged in a row, and continuously provided on the upper end side of each side plate. In the corrugated cardboard box in which the lid surface is configured by bending the inner side, the bottom surface is configured by bending the four bottom plates connected to the lower end side of each side plate inward, and thereby assembled into a rectangular parallelepiped shape,
A pair of opposed lid plates that are bent to the uppermost surface are provided with butt edges that face each other close when the pair of lid plates are closed,
Providing an insertion piece at the abutting edge of one lid plate of the pair of lid plates, and providing an insertion port into which the insertion piece is inserted at the abutting edge of the other lid plate,
The butt edge of the other lid plate is formed by a mountain fold when the reinforcing plate connected to the tip of the lid plate is folded inward so as to overlap the lower surface of the lid plate. A cardboard box, wherein the insertion port is formed. The cardboard box according to claim 1,
The mountain folds are formed by bending the reinforcing plate at substantially right angles at first and second mountain fold lines that are parallel to each other and formed at an interval corresponding to the thickness of the cardboard. Corrugated cardboard box. A cardboard box according to claim 2,
A first cut line located on the first fold line on the lid plate side at the mountain fold portion, and the reinforcing plate in a direction perpendicular to the first cut line from both ends of the first cut line And a U-shaped cut formed by a second cut line formed up to a second mountain fold line on the side, and the reinforcing plate is attached to the lid plate by the first and second mountain fold lines. When the sheet is bent so as to overlap with the lower surface of the plate, the insertion port is opened by opening the U-shaped cut, and at the same time, the rectangular plate-shaped portion surrounded by the first and second cut lines is A cardboard box characterized in that a receiving piece for insertion guide that protrudes from the mountain fold portion and is flush with the reinforcing plate is formed on the lower side of the insertion opening by being cut off from the cover plate. The cardboard box according to any one of claims 1 to 3,
A corrugated cardboard box, wherein a locking notch that engages with a side edge of the insertion port is provided on a side edge on a base side of the insertion piece. A cardboard box according to any one of claims 1 to 4,
The pair of facing lids located on the lower side of the lid plate that is the uppermost surface is provided with butting edges that face each other close to each other when the pair of lid plates are closed. A cardboard box, wherein at least one is provided with a notch for inserting a finger or the like. A cardboard box according to any one of claims 1 to 5,
In the unfolded state, the distance from the base of the lid plate having the insertion piece to the tip edge of the insertion piece, the distance from the base of the lid plate having the reinforcement plate to the tip edge of the reinforcement plate, and the remaining two sheets A cardboard box characterized in that the distance from the base of the cover plate to each end edge is set to be substantially uniform.

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