Side wall integrated double truss handle box container and method of forming truss handle

Abstract

To provide a method for manufacturing a handle-equipped box container that can be carried without instability and anxiety when lifting and transporting the box container carrying and packaged with heavy items by one hand, at a low cost and efficiently.SOLUTION: When assembling the box container from a single sheet, fitting parts are provided to act as beams so that a pair of narrow side walls and a pair of upper inner flaps extending from the top do not collapse. Additionally, a handle reinforcement flap that can be folded inwards and outwards is placed on the tops of a pair of upper outer flaps extending from the top, ensuring that when folded, its tip arrives at the bent portion of the truss-forming handle provided within a pair of upper outer flaps. Furthermore, by forming a gable roof-shaped truss structure with a pair of wide side walls and a pair of upper outer flaps, and overlapping the pair of truss-forming flaps created within the upper outer flaps inward, the truss structure of the handle section emerges. This synergy allows for stable transportation of heavy loads.SELECTED DRAWING: Figure -4

Description

[Technical field]

[0001] The present invention relates to a box container formed from a single rectangular sheet and provided with a handle so that a heavy object can be easily carried with one hand.

[0002] Conventionally, when various heavy objects are put into cardboard boxes or other containers and then carried, I have proposed in the following document that the top surface be made into multiple leaves, a truss handle be drilled into it, and various other measures be implemented to enable heavy objects to be carried with one hand.

[0003] Patent application 2020-115217 Patent application 2021-58706 Patent application 2021-105213 Patent application 2021-151577 Summary of the Invention [Problem to be solved by the invention]

[0004] To develop a box container capable of stably and safely carrying a weight of 20 kg, the limit weight that a person can carry with one hand, and the main body and handle of which will not be damaged even if the box container is moved repeatedly, assuming that the weight is 20 kg.

[0005] Minimize costs and maintain strength. [Means for solving the problem]

[0006] In the above mentioned prior document, I have already proposed a method to make the top surface triple and form a truss handle to make it possible to carry heavy objects, but in order to make it possible to withstand a lifting load of 20 kg, which is the limit weight that a person can carry and move with one hand, the outer flaps are extended on the opposing wide side walls of the box container, the length of each of the outer flaps is the horizontal part of the narrow side wall, and a handle part is drilled on the inside of the flaps. Furthermore, the handle part drilled in a U-shape is folded inward to form a double truss handle lower part, and the tips of the upper outer flaps are folded inward to form a handle reinforcing folded flap to prevent damage due to the lifting load when the truss handle part is grasped. These four methods will be shown later as implementation methods. Effect of the Invention

[0007] According to the present invention, by using the most widely used conventional JIS standard A-type corrugated cardboard, it is possible to provide it at the lowest cost and improve productivity.

[0008] Truss forming flaps TF1, TF2 are drilled inside the truss section formed by the upper outer flap TFO1 connected to the wide side wall WS1 and the upper outer flap TFO2 connected to the wide side wall WS2 so that they can be folded inward at the valley fold lines 1Y, 2Y, and a truss section is formed as a handle section, forming a double truss structure, and further, the handle reinforcing fold-back flaps TFB1, TFB2 are folded so that they contact the valley fold lines 1Y, 2Y of the truss forming flaps TF1, TF2, preventing damage to the handle section, and making it possible to carry heavy objects with one hand.

[0009] Can be wrapped around or set up depending on the contents

[0010] By folding the handle fold flaps TFB1, TFB2 back at the cut valley fold line or perforation valley fold line ST1, ST2 and fixing the GL portion with adhesive or the like or applying a cold sealant beforehand and crimping, it is possible to prevent damage to the handle portion due to weight, and by folding the handle fold flaps TF3, TFB4 outward at the cut mountain fold line or perforation mountain fold line on the front surface, the handle portion is reinforced. Furthermore, by folding the truss-forming flaps TF1 and TF2 inward at the valley fold lines 1Y and 2Y, the truss portion of the handle is fixed, improving the grip.

[0010] In order to prevent the box container from being deformed by the weight, flap collapse prevention hooks FC1, FC2 and collapse prevention hook fitting holes FCR1, FCR2 are provided so that the pair of upper inner flaps do not collapse, and by fitting them together, the cubic shape of the box container can be maintained.

[0011] It can be used as a double-truss handle-type exterior cardboard container that allows heavy items such as beverage cans, PET bottles, commercial beverages, seasonings, vegetables, fruits, etc. to be carried with one hand. It can also be used in a wide range of applications as a heavy-duty box container in fields such as bag-in-boxes and outer packaging boxes with handles that allow heavy items such as various home appliances to be carried with one hand. [Brief description of the drawings]

[0012] [Figure 1] 1A is a development view of the first embodiment, and FIG. 1B shows the state in which the handle reinforcement fold-back flaps TFB1 and TFB2 are folded along the rear cut valley fold lines or perforation valley fold lines ST1 and ST2 and the adhesive parts GL are fixed. [Figure 2] (2-A) shows the wraparound packaging state with the contents inside, folded at the valley fold line 2B. (2-B) is a perspective view showing the state immediately before the joint flap JF is folded at the valley fold lines 2C and 2D and fixed to the narrow side wall SS1. [Figure 3]3-A is a perspective view showing a state where the narrow side wall SS1 is folded at the valley fold line 2A and fixed to the joint flap JF, 3-B is a perspective view showing a state where a pair of upper and lower inner flaps TFI1, TFI2, UFI1, UFI2 are folded at the valley fold lines 1A, 1C, 1E, 1G, respectively, and 3-C is a perspective view showing a state where a pair of upper and lower outer flaps TFO1, TFO2, UFO1, UFO2 are folded at the valley fold lines 1B, 1D, 1F, 1H, respectively, and fixed at the adhesive joint GL, resulting in the completed box container 1. [Figure 4] FIG. 4A shows the open hole OH of the upper outer flap of box container 1 opened with a finger, FIG. 4B shows the state after contents have been placed inside and the handle reinforcing folded flaps TFB1, TFB2 at the tips of the upper outer flap are engaged at the apex of the truss and the truss forming flaps TF1, TF2 are folded over at the valley fold lines 1Y, 2Y to form the truss structure of the handle, and FIG. 4C is an enlarged view of the double truss structure and the reinforced part of the handle, showing the state in which the flap collapse prevention hooks FC1, FC2 provided at one of the tips of the pair of upper inner flaps TFI1, TFI2 fit into the collapse prevention hook fitting holes FCR1, FCR2 provided at the boundary between the wide side walls WS1, WS2 and the upper outer flaps TFO1, TFO2 to form the bottom of the truss handle and hold the cube of the box container.

[0013] [Figure 5] (5-A) is a development view of the second embodiment, and (5-B) shows the state in which the product is folded at the valley fold line 2B, assuming a wrap-around packaging state with the contents inside. [Figure 6] (6-A) is a perspective view showing the state immediately before the joint flap JF is fixed to the narrow side wall SS1 by folding at the valley fold lines 2C and 2D, (6-B) is a perspective view showing the state in which the narrow side wall SS1 is folded at the valley fold line 2A and fixed to the joint flap JF, (6-C) shows the state in which the pair of upper and lower inner flaps TFI1, TFI2, UFI1, and UFI2 are folded at the valley fold lines 1A, 1C, 1E, and 1G, respectively, [Figure 7](7-A) is a perspective view showing a state where a pair of upper and lower outer flaps TFO1, TFO2, UFO1, UFO2 are folded at valley fold lines 1B, 1D, 1F, 1H, respectively, and fixed at adhesive joints CL, resulting in the completed box container 2. (7-B) shows a state where the upper outer flaps TFO2, TFO1 and the upper inner flaps TFI1, TFI2 of the box container 2 are opened. (7-C) shows a state where the flap collapse prevention hooks FC1, FC2 overlap and fit with the collapse prevention hook fitting holes FCR1, FCR2 at the dashed arc portions. [Figure 8] (8-A) shows the state where the handle reinforcement fold flap TFB1, TFB2 located at the end of a pair of upper outer flaps are folded inward at the back perforation valley fold lines ST1, ST2 (back cut valley fold lines are not used this time), and then the truss forming flaps TF1, TF2 are folded at the valley fold lines 1Y, 2Y. (8-B) shows the state where the handle reinforcement fold flap TFB1 is folded at the front perforation valley fold line ST1, the other handle reinforcement fold flap TFB2 is folded over it at the back perforation valley fold line ST2, and the truss forming flaps TF1, TF2 are folded in that order at the valley fold lines 1Y, 2Y while covering it, and the state where the contents are stored is also shown. (8-C) is an enlarged view of the double truss handle part after it has been formed, and (8-D) shows the cross-sectional structure of the double truss handle.

[0014] [Figure 9] 9A is a development view of the third embodiment, and FIG. 9B shows the state in which the box container 3 is folded along the valley fold lines 2A and 2C to form the box container 3 in a setup packaging state. [Figure 10](10-A) shows the state where the wide side wall WS2 and narrow side wall SS1 are fixed with a joint flap JF. (10-B) shows the state where the flattened state of (10-A) is made into a three-dimensional rectangular tube, the pair of lower inner flaps UFI1 and UFI2 are folded inward at the valley fold lines 1E and 1G, and the lower outer flaps UFO1 and UFO2 are folded over at the valley fold lines 1F and 1H and fixed with adhesive tape or glue (GL). The contents are filled from the top opening and used as a set-up container. (10-C) shows a structure in which a pair of upper inner flaps TFI1, TFI2 are folded inward at valley fold lines 1A, 1C so that a pair of upper inner flaps TFI1 and a flap collapse prevention hook FC1 formed at one of their tips engage with the collapse prevention hook fitting hole FCR1, and so that an upper inner flap TFI1 and a flap collapse prevention hook FC2 formed at one of their tips engage with the collapse prevention hook fitting hole FCR2, thereby preventing deformation due to the weight of the box container 3. [Figure 11] (11-A) shows the state in which the upper outer flaps TFO1, TFO2 are successively folded at the valley fold lines 1B, 1D and secured at the adhesive part GL to complete the box container 3. (11-B) is a perspective view showing the state in which the adhesive part GL of (11-A) is released, the upper outer flaps TFO1, TFO2 are spread out, the handle reinforcement folded back flaps TFB1, TFB2 are folded at the back cut valley fold lines or perforation valley fold lines ST1, ST2, secured by pressing the cold seal part, and further the truss forming flaps TF1, TF2 are folded inward at the valley fold lines 1Y, 2Y. (11-C) is a perspective view showing the state in which the handle reinforcing folded flaps TFB1, TFB2 formed at the tips of the upper outer flaps TFO1, TFO2 are engaged with the truss forming flaps TF1, TF2 overlapping on the inside to form a double truss handle in which a truss serving as a gripping portion is formed on the inside of the large truss formed by the upper outer flaps TFO1, TFO2.

[0015] [Figure 12](12-A) is a development view of the fourth embodiment. (12-B) shows the state where the box container 4 is folded at the valley fold lines 2A and 2C to form the box container 4 in a setup packaging state, as in the third embodiment. [Figure 13] (13-A) shows the state where the wide side wall WS2 and narrow side wall SS1 are fixed with a binder at the joint flap JF. (13-B) shows the state where the flattened state of (13-A) is made into a three-dimensional rectangular tube, the pair of lower inner flaps UFI1 and UFI2 are folded inward at the valley fold lines 1E and 1G, and further the lower outer flaps UFO1 and UFO2 are folded over at the valley fold lines 1F and 1H and fixed with adhesive tape or glue (GL). The contents are filled from the top opening and used as a set-up type container. (13-C) shows a structure in which a pair of upper inner flaps TFI1, TFI2 are folded inward at valley fold lines 1A, 1C so that a pair of upper inner flaps TFI1 and a flap collapse prevention hook FC1 formed on one of their tips engage with the collapse prevention hook fitting hole FCR1, and so that an upper inner flap TFI1 and a flap collapse prevention hook FC2 formed on one of their tips engage with the collapse prevention hook fitting hole FCR2, thereby preventing deformation due to the weight of the box container 4. [Figure 14] (14-A) shows the state where the upper outer flaps TFO1 and TFO2 are folded in order at the valley fold lines 1B and 1D and fixed at the adhesive part GL to complete the box container 4. (14-B) shows the state where the adhesive part GL of (14-A) is released, the upper outer flaps TFO1 and TFO2 are spread out, the handle reinforcement fold-back flaps TFB1 and TFB2 are folded outward at the surface cut valley fold lines or perforation valley fold lines ST3 and ST4, and the truss forming flaps TF1 and TF2 are folded at the valley fold lines 1Y and 2Y, respectively. (14-C) shows the state where six 2L PET bottles are stored and a double truss handle is formed so that the container can be carried with one hand.

[0016] [Figure 15](5-A) shows the state in which the truss handle of the box container 1 is gripped with one hand, and shows the first embodiment at actual size, in which a pair of handle reinforcing fold-back flaps TFB1, TFB2 are previously folded at the back cut valley fold lines or perforation valley fold lines ST1, ST2 and fixed to the upper outer flaps TFO1, TFO2 at the adhesive joint GL, and the truss forming flaps TF1, TF2 show the truss structure of the handle portion. (15-B) is a second embodiment showing the state in which the handle reinforcement fold flap TSB1 extending to the upper outer flap TFO1 is mountain folded at the back perforation valley fold line ST2 (a back cut valley fold line is not used this time) and then the handle reinforcement fold flap TSB2 extending to the upper outer flap TFO2 is similarly mountain folded at the back perforation valley fold line ST1 and layered on top of ST1, while the truss forming flaps TF1 and TF2 are folded, forming a truss structure for the handle portion. (15-C) shows a third embodiment of a method for forming a truss handle similar to the first embodiment of (15-A), but in (15-A), both handle foldback flaps are fixed to the adhesive part GL in advance, whereas in (15-C), a cold seal part CS is applied beforehand, and after opening the box container 3, both handle reinforcement foldback flaps are folded inward at the back cut valley fold line or perforation valley fold line ST1, ST2 to be fixed to the upper outer flap, showing the truss structure of the handle by folding the truss forming flaps TF1, TF2. (15-D) shows that, without using adhesive, the handle reinforcement foldback flaps TSB1, TSB2 are folded outward at the front cut mountain fold line or perforation mountain fold line, and the truss forming flaps TF1, TF2 are folded inward to form a truss handle, and a strong truss handle is completed just by gripping it with your hand.

[0017] Hereinafter, an embodiment of the present invention will be described. <Overall configuration> This invention describes in detail four methods of implementing a box container that is constructed such that a pair of wide side walls and upper outer flaps adjacent to their upper parts are integrated together so that the box container and the handle can withstand a heavy load stored in it and be carried by one hand, and further the upper outer flaps form an outer frame truss together, and while a pair of handle reinforcing fold-back flaps are folded back parallel to the upper parts of the pair of upper outer flaps, a pair of truss forming flaps are folded back inward to form a box container with high resistance to lifting loads, and a pair of upper inner flaps support the load horizontally in the lateral direction of the upper opening of the box container. The four methods involve a pair of wide side walls and a pair of flaps on their extensions. TIFF2025085568000002.tif17170Four implementation methods of the handle truss that forms the handle formed on the inside are detailed.

[0018] (First Implementation Method) A pair of handle reinforcement fold-back flaps TFB1, TEB2 of the handle part shown in (1-A) of [Fig. 1] are folded at the back cut valley fold lines or perforation valley fold lines ST1, ST2, glued at the adhesive part GL, and fixed as shown in (1-B). In the wrap-around packaging form, the part is folded at the valley fold line 2B to the state shown in (2-A) of [Fig. 2], the side wall is folded at the valley fold line 2C as shown in (2-B), and the joint flap JF is folded at the valley fold line 2D, The state in which the wide side wall WS2 and the narrow side wall SS1 are glued and fixed is shown in (3-A) of Figure 3, and the state in which the pair of upper inner flaps TFI1, TFI2 are folded at valley fold lines 1A, 1C, flap collapse prevention hooks FC1, FC2 formed on one of the tips are fitted into collapse prevention hook fitting holes FCR1, FCR2, and the pair of lower inner flaps UFI1, UFI2 are folded inward at valley fold lines 1E, 1G is shown in (3-B). Finally, the upper outer flaps TFO1, TFO2 are folded along the valley fold lines 1B, 1D and simultaneously glued and secured at the adhesive joints GL, and at the same time, the lower outer flaps UFO1, UFO2 are folded inward along the valley fold lines 1E, 1H and secured at the adhesive joints GL to produce the completed packaged box-container 1, as shown in (3-C). Furthermore, in the first embodiment of the formation of the double truss handle integrated with the side wall, as shown in (4-A) of [Fig. 4], the adhesive portion GL of the upper outer flap TFO2 of the box container 1 is released to open it, and further, in (4-B), the tip portions of the handle fold-back flaps TFB1 and TFB2 are engaged to form a truss handle portion, and a package is stored in it and can be carried with one hand. The state of the double truss handle is enlarged, and as shown in (4-C), it is connected to the corresponding wide side walls WS1 and WS2. The handle reinforcing foldback flaps TFB1, TFB2 formed on the inside of the integrated upper outer flaps TFO1, TFO2 are fixed to the respective upper outer flaps on the inside to reinforce the handle, forming a handle that is strong and durable even when weight is applied, and the truss forming flaps TF1, TF2 that make up the lower part of the handle are folded inward at valley fold lines 1Y, 2Y to form an upper truss structure, thereby showing a method of forming a double truss handle that can withstand heavy loads.

[0019] (Second implementation method) A pair of handle reinforcing fold-back flaps TFB1, TFB2 of the handle portion shown in (5-A) of FIG. 5 are folded in advance as in the first embodiment without being fixed, and as shown in (5-B), the side walls are folded at the valley fold line 2B in a wrap-around packaging form. Steps (6-A) to (6-C) of FIG. 6 are omitted because they are the same as the first embodiment. In (7-A) of [Fig. 7], the handle-reinforced folded-back flaps TFB1, TFB2 extending from the upper outer flaps TFO1, TFO2 are not folded at the back cut valley fold line or perforation valley fold line ST1, ST2, but are placed on the upper outer flap TFO1 and fixed at the adhesive part GL to form the box-container 2. In (7-B), the handle part is exposed from the packaged box-container 2, and a mechanism that enables heavy objects to be safely carried with one hand is shown in a state in which the pair of upper outer flaps TFO1 and TFO2 connected to the wide side walls WS1, WS2 and the upper inner flaps TFI1, TFI2 connected to the narrow side walls SS1, SS2 are fully opened, and the situation when the contents are taken out is also shown. Next, in (7-C), in order to prevent deformation due to its own weight when the box container is carried, the upper inner flaps TFI1, TFI2 are always folded at valley fold lines 1A, 1C to form flap collapse prevention flaps FC1, FC2 at one end of each, and the collapse prevention hook fitting holes FCR1, FCR2 are formed in a position so that they fit into their counterparts, thereby preventing deformation of the box container 2 by fitting them into the overlap portion OL. (8-A) in [Fig. 8] shows how the handle reinforcement fold-back flaps TFB1, TFB2 formed at the tip of the mating upper outer flap are folded inward at the perforated valley fold line (a cut valley fold line is not used here), and as shown in (8-B), TFB1 is placed downward and TFB2 is placed on top of it, while the truss forming flaps TF1, TF2 are folded at the valley fold lines 1Y, 2Y as shown in (8-A) to form a truss handle for the handle section. (8-C) shows an enlarged view of the outer frame truss formed with the mating upper outer flap, and the handle section is reinforced by overlapping the handle fold-back flaps TFB1, TFB2 at the tip, and the truss handle section is formed as the handle section together with the truss forming flaps TF1, TF2. (8-D) is a cross-sectional view showing a second embodiment of the method, in which the handle reinforcement fold-back flap TFB1 is folded at ST1 and the upper outer flap TFO2 is layered on top of it, and then the handle reinforcement fold-back flap TFB2 is folded at ST2 and layered on the upper outer flap TFO1, and the truss forming flaps TF1 and TF2 are folded at valley fold lines 1Y and 2Y to form a truss structure in the handle portion.

[0020] (Third Implementation Method) The meaning shown in (9-A) of [Fig. 9] is that by applying a cold seal agent in advance to the cold seal part CS, which is the diagonal part that is part of the pair of handle foldback flaps TFB1, TFB2, which are part of the handle part, the handle reinforcement foldback flaps TFB1, TFB2 are folded inward at the back cut valley fold line or perforation valley fold line at the time of forming the handle part, and pressed, the damage to the handle part is prevented. In (9-B), the wide side wall WS2 is folded at the valley fold line 2C, and the narrow side wall SS1 is folded at the valley fold line 2A and fixed with the joint flap JF. In (10-A) of [Fig. 10], the narrow side wall SS1 and the wide side wall WS2 are fixed with joint flaps JF using glue or the like to form a rectangular cylindrical flattened body of the box container 3. Next, after forming a rectangular cylindrical shape as in (10-B), the lower inner flaps UFI1 and UFI2 are folded inward at the valley fold lines 1E and 1G, and further the lower outer flaps UFO1 and UFO2 are folded at the valley fold lines 1F and 1H, and the four adhesive parts GL are fixed with glue or the like to form the bottom of the box container 3. Furthermore, as shown in (10-B), the upper inner flaps TFI1, TFI2 are folded at the valley fold lines 1A, 1C, and the flap collapse prevention hooks FC1, FC2 formed on one of the ends of each are fitted into the collapse prevention fitting holes FCR1, FCR2 shown in (10-B), thereby maintaining the strength of the cube of the box container 3 and acting as beams to withstand the load, as shown in (10-C). As shown in (11-A) of FIG. 11, the upper outer flaps TFO2 and TFO1 are folded over and folded along the valley fold lines 1D and 1B, and the adhesive parts GL are fixed with glue or the like to complete the box container 3. Next, in order to release the adhesive portion GL of the packaged box container 3 and form a double truss handle, the upper outer flaps TFO1, TFO2 are opened, and the handle reinforcement fold-back flaps TFB1, TFB2 formed at their tips are folded and crimped along the back cut valley fold lines or perforation valley fold lines ST1, ST2 so as to be bonded with the cold seal agent of the cold seal portion that was applied beforehand.Then, the truss forming flaps TF1, TF2 of the handle portion are folded inward along the valley fold lines 1Y, 2Y, as shown in (11-B). In (11-C), a handle-reinforcing folded-back flap is formed on the upper outer flaps TFO1, TFO2 extending from the wide side walls WS1, WS2 of a packaged box container containing a heavy object, and the ends of the flaps are engaged to form a triangular truss of the outer frame. By overlapping the truss-forming handles TF1, TF2 to form the truss handle of the handle section, a double truss handle strong enough to withstand heavy objects is formed, allowing the container to be carried with one hand.

[0021] (Fourth Implementation Method) FIG. 12 (12-A) is a plan view for forming the box container 4. The difference from other implementation methods is that the handle-reinforced fold-back flaps TFB1, TFB2 are formed so that they can be gripped by hand and tightly attached when folded outward along the surface cut fold lines or perforated fold lines ST3, ST4. In (12-B), as in the third embodiment, the wide side wall WS2 is folded at the valley fold line 2C, and then the narrow side wall SS1 is folded at the valley fold line 2A, so that the end of the narrow side wall is overlapped on top of the joint flap JF and fixed with glue or the like. In (3-A) of [Figure 13], the wide side wall SW2 and the narrow side wall SS1 are joined by the joint flap JF to form a flat container. Next, the flat container is made into a rectangular cylindrical shape, and the lower inner flaps UFI1 and UFI2 are folded inward at the valley fold lines 1E and 1G, respectively. Then, the lower outer flaps UFO1 and UFO2 are folded inward at the valley fold lines 1F and 1H, respectively, and the four adhesive parts GL are fixed with glue or the like to form the bottom. (13-B) shows the state in which the upper inner flaps TFI1 and TFI2 are folded at the valley fold lines 1A and 1C, and the flap collapse prevention hooks FC1 and FC2 formed at one end of each are fitted into the collapse prevention fitting holes FCR1 and FCR2 shown at (13-B), and when a heavy object is placed inside the box container and lifted, they act as beams to maintain the cube shape against the weight acting inward from the wide side wall direction. Next, as shown in (14-A) of [Fig. 14], the upper outer flap TFO2 is folded at the valley fold line 1D, and the upper outer flap TFO1 is folded at the valley fold line 1B so as to overlap it, and the adhesive part GL is fixed with glue or the like to complete the box container 4. Now, as a method of forming a handle for actually carrying a box container containing a heavy object, first the adhesive portion of (14-A) is released and the upper outer flaps TFO1, TFO2 are opened, then the handle reinforcement fold back flaps TFB1, TFB2 located at each end are folded outward at the surface cut mountain fold lines or perforation mountain fold lines ST3, ST4, and further the truss forming flaps TF1, TF2 are folded at the valley fold lines 1Y, 2Y, respectively, as shown in (14-B). An outer frame truss with a gabled structure is formed with the surface cut mountain fold lines or perforation mountain fold lines ST3, ST4, which are the ends of the upper outer flaps TFO1, TFO2, as apexes, and by grasping the handle portion with one hand, the truss forming flaps TF1, TF2 of the handle portion are folded at the valley fold lines 1Y, 2Y, forming a handle portion truss, and a double truss structure is formed, as shown in (14-C), which allows six 2L PET bottles to be packaged and carried.

[0022] Figure 15 shows an enlarged view of the structure of the truss handle, which is the grip for the four implementation methods mentioned above. (15-A) is the first implementation method, (15-B) is the second implementation method (15-C) is the third implementation method, and (15-D) is the fourth implementation method. It is. [Explanation of symbols]

[0023] 1, 2, 3, 4: Box container TFI1, TFI2: Upper inner flap TFO1, TFO2: Upper outer flap WS1, WS2: Wide sidewall SS1, SS2: Narrow side wall UFI1, UFI2: Lower inner flap UFO1, UFO2: Lower outer flap JF: Joint flap TFB1, TFB2: Handle reinforcement fold-over flap TF1, TF2: Truss forming flaps FC1, FC2: Hooks to prevent flap collapse FCR1, FCR2: Anti-sinking hook fitting hole OL: Overlapped part OH: Open Hole GL: Adhesive part ST1, ST2: Back cut fold line or perforated fold line 1Y, 2Y, 1A, 1B, 1C, 1D, 2A, 2B, 2C, 2D 1E, 1F, 1G, 1H: Taniori line ST3, ST4: Surface cut fold line or perforated fold line CS: Cold seal part

Claims

1. A box container assembling sheet for assembling a box container, comprising a pair of opposing wide side walls of the box container, a pair of narrow side walls constituting the other opposing side walls of the box container, a pair of upper inner flaps arranged adjacent to and above the narrow side walls, and a pair of upper outer flaps arranged adjacent to and above the wide side walls, each at a length approximately equal to the short side of the narrow side walls.

2. A box-container assembling sheet as described in claim 1, characterized in that a flap collapse prevention hook is provided at the tip of the pair of upper inner flaps, and a collapse prevention hook fitting hole is drilled at a position where the boundary between the wide side wall and the pair of upper outer flaps is joined when the inner flap is folded inward to prevent it from collapsing.

3. 3. The double truss handle box container according to claim 1, further comprising a pair of upper outer flaps extending upward from the pair of wide side walls via a valley fold line, the pair of upper outer flaps being formed with handle reinforcement foldback flaps that can be folded inward and outward, and when folded at their respective boundaries, the end of the flaps is positioned at the fold portion where a U-shaped truss forming flap with a bent portion at the top is drilled so that the flaps can be held inward with one hand at the center upper portion of the upper outer flap, the pair of upper outer flaps extending upward from the pair of wide side walls via a valley fold line are joined horizontally at the boundaries where the pair of handle reinforcement foldback flaps are folded inward and outward to form a truss structure, and a truss handle is formed by folding the pair of truss handles inward and overlapping them on the inside of the truss structure.

4. A method for forming a truss handle as described in claims 1, 2 and 3, characterized in that a pair of handle reinforcement fold flaps connected to the tip portions of the pair of upper outer flaps are folded inward at a back cut valley fold line or a perforated valley fold line and fixed with glue or the like, the folded portions are joined to form a gable roof shaped truss between the pair of wide side walls, and further, the pair of handle reinforcement fold flaps are configured so that their folded tips reach the inward upper folded portions of a pair of truss-shaped flaps formed within the pair of upper outer flaps, and the pair of truss forming flaps are folded inward at their upper folded portions with a width that allows four fingers to enter, to form a truss handle.

5. A method for forming a truss handle according to claims 1, 2 and 3, characterized in that a pair of handle reinforcement fold flaps connected to the upper parts of the pair of upper outer flaps are folded inwardly at the perforation valley fold lines, one handle reinforcement fold flap is placed over the other handle reinforcement fold flap, and the tip of each handle reinforcement fold flap reaches the folded part of a pair of truss forming flaps formed in the corresponding upper outer flap, and the pair of truss forming flaps are folded and overlapped with a width that allows four fingers to enter, thereby forming a truss handle.

6. 4. A method for forming a truss handle according to claim 1, 2 or 3, characterized in that a cold sealant is applied in advance to the joint surface between a pair of handle reinforcement folded flaps connected to the upper part of the pair of upper outer flaps and the upper outer flaps, the pair of handle reinforcement folded flaps are fixed by folding and pressing the pair of handle reinforcement folded flaps at the back cut valley fold line or perforation valley fold line, and the folded parts are joined to form a gable roof-like truss between the pair of wide side walls, and the pair of handle reinforcement folded flaps are folded inwardly to the upper bent parts of a pair of truss forming flaps formed within the pair of upper outer flaps so that their tips reach the upper bent parts, and the pair of truss forming flaps are folded inwardly at their upper bent parts so that four fingers can fit therein, thereby forming a truss handle.

7. A method for forming a trough handle according to claims 1, 2 and 3, characterized in that a pair of handle reinforcement fold flaps connected to the upper parts of the pair of upper outer flaps are folded outward at a surface cut mountain fold line or a perforation mountain fold line, folded at a valley fold line between the pair of wide side walls, and the folded parts of the pair of handle reinforcement fold flaps are joined horizontally to form a gable roof truss, and further configured so that the tips of the pair of handle reinforcement fold flaps reach the folded parts of a pair of truss forming flaps which have a folded part at the upper center within the pair of upper outer flaps, and the upper folded parts of the pair of truss forming flaps are folded inward in a state that allows four fingers to fit in the truss handle.

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