JP5068993B2 - Corrugated board top plate structure - Google Patents

Description

  The present invention relates to a corrugated cardboard basket, and more particularly to a top plate structure in a developed paper of the corrugated cardboard basket.

  In recent years, corrugated cardboard boxes have attracted attention as a material that can replace wooden boxes. This type of corrugated cardboard has the advantage that it is lighter and more combustible than a wooden corrugated board and can be easily assembled by folding a developed paper made of corrugated cardboard.

An example of a conventional cardboard box is shown in FIGS.
In the corrugated cardboard bag 1, a box-shaped bag body 2 and a lid 3 are formed of a thick reinforced cardboard material. A lid 3 having a viewing window S is placed on the upper end of the bag body 2 so as to be openable. The lid 3 includes a top plate 3A, side plates 3B and 3B, and end plates 3C and 3C, and chamfered portions 3n are formed on the plate surfaces of the side plates 3B and 3B and the end plates 3C and 3C.
As shown in FIG. 17, the spread paper P0 of the lid 3 is provided with side plates 3B and 3B on both sides of the rectangular top plate 3A in the lateral direction, and on the both sides in the vertical direction of the top plate 3A. At the boundary between the top plate 3A and the side plate 3B and the boundary that divides the chamfered portion 3n of the side plate 3B, vertical V grooves y1 and y2 that are cut in a V shape at approximately 45 ° are formed. Further, at the boundary between the top plate 3A and the end plate 3C and the boundary that delimits the chamfered portion 3n of the end plate 3C, horizontal V-grooves x1 and x2 that are similarly cut into a V shape at a 45 ° angle are formed. At the time of assembling the developing paper P0, the side plate 3B and the end plate 3C are bent into a box shape along the vertical V grooves y1, y2 and the horizontal V grooves x1, x2 with respect to the top plate 3A to assemble the lid 3 shown in FIG.

As shown in FIG. 17, a folded portion 3 m for increasing the strength of the lid 3 is provided at the opening ends of the side plate 3 </ b> B and the end plate 3 </ b> C. The folded portion 3m is formed by arranging a sheet of paper of a certain width at the end of the side plates 3B and 3B and the end plates 3C and 3C of the developed paper P0 in parallel with two rows of V-grooves cut into V-shapes at approximately 90 ° angles. It is formed by folding back along the groove formed.
Patent Documents 1 and 2 are disclosed as prior art related to the conventional corrugated cardboard cage related to the above.

JP-A-9-276346 Utility Model Registration No. 3036027

  However, in such a conventional corrugated board bag, since the top plate 3A, the side plate 3B and the end plate 3C are integrally provided on a single developed paper P0, the size of the developed paper P0 is increased. For this reason, it is difficult to handle the corrugated board for producing the developing paper P0, and the processing work becomes complicated with a normal cutting machine. In particular, in the conventional developed paper P0 shown in FIG. 17, it is necessary to cut a plurality of V-grooves and W-grooves that are continuous in the vertical and horizontal directions on a single corrugated board at accurate positions. May be forced to introduce dedicated large machines.

  On the other hand, it is also conceivable that the top plate 3A, the side plate 3B, and the end plate 3C of the developing paper P0 are separated and manufactured in separate parts, and these end surfaces are bonded together to complete the lid 3. However, in such a manufacturing method, the end surfaces of the side plate 3B and the end plate 3 must be accurately aligned with each other and connected to the side end surfaces of the top plate 3A, and the assembling work becomes troublesome. In addition, it is difficult to obtain dimensional accuracy at the connecting corners on each side of the top plate, and the strength of the connecting corners tends to be lowered.

  The present invention has been made in view of such a situation, and by dividing the development paper including the top plate, the side plate, and the end plate into parts, the handling at the time of processing is facilitated, and the assembly work of the development paper is performed. An object of the present invention is to provide a top board structure of a corrugated board basket that is simple and can maintain good accuracy and strength at the connecting corners on each side of the top board.

[First invention]
The top plate structure of the corrugated cardboard cage of the present invention for solving the above problems is
In a corrugated cardboard box provided with a box-shaped bag body and a lid that can be opened on the bag body,
The lid is
With the top plate,
Side plates provided on both lateral sides of the top plate;
It is provided with twill plates provided on both sides in the longitudinal direction of the top plate,
The developed paper including the top plate, the side plate and the end plate is folded along a V-groove formed at the boundary of each plate and assembled into a box shape,
The top plate is
A vertical frame piece provided on the side plate across the V-groove and continuous from each side on both sides of the top plate inward to the plate surface with a constant plate width;
A horizontal frame piece provided on the end plate across the V-groove, and extending from each side on both sides in the vertical direction of the top plate to the inside of the plate surface with a constant plate width;
An inner lid piece connected to the inside of a frame body composed of the vertical frame piece and the horizontal frame piece,
Furthermore, the both ends of the vertical frame piece and the horizontal frame piece divide the corners of the plate surface of the top plate, the parts including the side plate and the vertical frame piece, and the parts including the end plate and the horizontal frame piece. And an acute angle end face is formed to divide
When producing the spread paper, the frame body is formed by connecting the acute angle end surface of the vertical frame piece and the acute angle end surface of the horizontal frame piece so as to coincide with each other on the same plane, and the frame is formed through the frame. The development paper is formed by combining the parts including the side plate and the vertical frame piece with the parts including the end plate and the horizontal frame piece .

  According to such a configuration, the developing paper constituting the corrugated cardboard basket includes parts including a vertical frame piece and a side plate of the top plate, parts including a horizontal frame piece and a side plate of the top plate, and parts including an inner lid piece. It is divided into. For this reason, when producing a development paper, a corrugated board can be cut for each of these parts, and handling at the time of the processing can be facilitated.

  Also, when assembling the spread paper, each part including the vertical frame piece and the horizontal frame piece is placed on the same plane, and a frame body is assembled by connecting these acute angle end faces, and an inner lid piece is placed inside the frame body. By connecting the parts, the parts can be easily combined. For this reason, a box-like corrugated board can be easily assembled by bending each sheet of the developed paper as in the conventional developed paper.

  Furthermore, in the configuration of the present invention, the side plate and the end plate are bent and connected to the four sides of the top plate of the developed paper with the vertical V-groove and the horizontal V-groove, so that the end surfaces of the respective plates can be easily and accurately aligned. As a result, the dimensional accuracy and strength of the connecting corners on each side of the top plate can be kept good.

  That is, the present invention makes it possible to handle the processing of the developed paper very easily by dividing the top plate of the developed paper into small parts that can be easily connected while taking advantage of the characteristics of the corrugated cardboard material suitable for the bending process. Is. As a result, when producing a corrugated paper basket, it is possible to easily and accurately produce the developed paper with a small cutting machine without introducing a dedicated large machine.

[Second invention]
Top plate structure of cardboard casket according to the second invention, there is provided a structure of the first invention, the plate width of the frame body consisting of the vertical frame pieces and the transverse frame pieces are set to be constant width The configuration is as follows.

  According to such a configuration, among the parts of the developed paper, the parts including the vertical frame piece and the side plate and the frame piece parts including the horizontal frame piece and the end plate coincide with each other in the plate width and the position of the V groove. For this reason, using the corrugated board of the same width and performing V-groove machining with a constant width in the length direction of the corrugated board, the parts can be easily produced with high dimensional accuracy.

[Third invention]
The top plate structure of the corrugated board cage according to the third invention has the configuration of the second invention, and the connecting surface between the side plate and the end plate at the time of assembling the spread paper is viewed from the plane direction of the top plate. The vertical frame piece and the horizontal frame piece are configured so as to coincide with the connection plane of the acute angle end faces.

  As shown in FIG. 17, in the conventional developed paper P0 having the chamfered portions 3n on the side plate 3B and the end plate 3C, the shape of the four corner portions K0 becomes complicated, and the processing work becomes troublesome. Specifically, the vertical V-grooves y1, y1 and the horizontal V-grooves x1, x1 surrounding the top plate 3A are adjacent to each other after being stopped at an accurate position without protruding outward at the intersections of the V-grooves. It is necessary to form an acute cut between the chamfered portions 3n and 3n, and to form inclined surfaces in different directions at the joints between the chamfered portions 3n and 3n. For this reason, at the actual site, it is difficult to finish the four corners K0 of the corrugated board by machining with a cutting machine, and the present situation is that it relies on manual work.

  According to the configuration of the third aspect of the invention, when the parts of the developed paper are produced, the top plate portion of the bent piece is turned up with the corrugated cardboard plate having a constant plate width folded along the V-groove. If the sheet is cut perpendicularly while maintaining the angle at which the corner of the plate surface is divided, this cut surface becomes the end surface of the four corners of the developed paper. For this reason, the end face of each board in the four corners of the developing paper P0 having the chamfered portion 3n can be finished very easily.

[Fourth Invention]
The top board structure of the corrugated board cage according to the fourth invention comprises any one of the first to third inventions, and is arranged on the upper surface of the frame body comprising the vertical frame piece and the horizontal frame piece. The lower surface of the lid piece is connected.

In the configuration of the first invention, when the inner lid piece is connected to the inner end face of the frame body composed of the vertical frame piece and the horizontal frame piece, the connecting direction is parallel to the plate surface of the top plate, so the vertical direction of the top plate It is difficult to sufficiently secure the connection strength of the inner lid piece against the load.
According to the configuration of the fourth aspect of the invention, the lower surface of the inner lid piece is connected to the upper surface of the frame (vertical frame piece and horizontal frame piece), so compared to the case where the inner lid piece is connected to the inner end surface of the frame, Its connection strength is greatly increased. For this reason, it is also possible to adopt a three-dimensional complex shape for the top board by changing the inner lid piece to a desired shape.

[First to Fourth Inventions]
1st-4th invention can be applied to the corrugated cardboard cage | basket which bends the expansion | deployment paper containing a top plate, a side plate, and a end plate in a box shape, and forms a box. In a corrugated cardboard basket in which the main body and the lid are combined, it is usually assumed that the present invention is applied to the lid side where the number of V-grooves is increased. May be applied. Moreover, the use (personal use, pet use, etc.) and the type (sleeper, sitting down etc.) of the cardboard basket are not particularly limited.

  In addition, the 1st-4th invention may be applied independently, and can also apply combining these inventions as needed. Further, the first to fourth inventions may be combined with other inventions described in this specification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the present invention is applied to a lid of a cardboard box.

[First Embodiment]
The corrugated board cage of 1st Embodiment was shown in FIGS.
As shown in FIGS. 1 and 2, the corrugated cardboard cage 10 includes a box-like cage body 12 and a lid 13. The bag body 12 and the lid 13 are made of thick reinforced corrugated cardboard material, and a lid 13 having a rectangular observation window S is placed on the upper end of the lid 13 so as to be openable. A window lid 15 indicated by a two-dot chain line in FIG. 2 is fitted into the viewing window S, and the inside of the bag can be viewed by opening the window lid 15.

The dimensions of the corrugated board 10 are, for example, about 170 to 200 cm in length, about 50 to 70 cm in width, and about 40 to 50 cm in height including the bag main body 12 and the lid 13.
In the state of FIG. 1, the paper surface of the corrugated cardboard basket 10 is exposed, but at the finishing stage, decoration materials such as upholstery are applied to the surface of the bag body 12 and the lid 13, and these paper surfaces are covered with the decoration material. Is called.

  A three-layer reinforced corrugated cardboard material (for example, manufactured by Triwall) is used as a corrugated cardboard plate for producing the corrugated cardboard cage 10. In this type of corrugated board, as shown in the R-part enlarged view of FIG. 2, three layers of corrugated plates r1 to r3 are provided with partition plates r4 and r5 between two thick plates (liners) Rf and Rb. And has excellent pressure resistance and water resistance. When forming the V-groove or W-groove for bending on the corrugated board, the other layers are cut while leaving any one of the thick plates Rf and Rb. When the corrugated board is bent, only the remaining one thick board is bent, and the cutting surfaces (end faces) of the inclined plates are aligned and bonded.

  The lid 13 includes a top plate 13A, side plates 13B and 13B, and end plates 13C and 13C. A chamfered portion 13n is formed on the upper surface of the side plates 13B and 13B and the end plates 13C and 13C, and a folded portion 13m (see FIGS. 3 and 7) is formed on the lower portion (opening end) of the plate surface.

The developing paper P1 of the lid 13 is shown in FIG.
The spread paper P1 is provided with side plates 13B and 13B with a vertical V-groove y1 on both lateral sides of the rectangular top plate 13A, and with the lateral plates 13C and 13C with a horizontal V-groove x1 on both sides in the vertical direction of the top plate 13A. Provided.
A vertical V-groove y2 and a horizontal V-groove x2 are formed with a constant plate width on the boundary between the side plates 13B and 13B and the end plates 13C and 13C, which divides the chamfered portion 13n.

  The vertical V grooves y1 and x1 and the horizontal V grooves y2 and x2 are cut on the plate surface of the developing paper P1 into a V-shaped cross section of approximately 45 ° and formed on the boundary line of each plate. As a result, each plate of the developed paper P1 is bent at a 45 ° angle to form the lid 13.

  At the opening end portions of the side plates 13B, 13B and the end plates 13C, 13C, a folded portion 13m is provided with a constant plate width. The folded portion 13m is formed of a piece of paper at the end in the vertical or horizontal direction of the developed paper P1, and a W groove (a groove formed by juxtaposing a V groove having a 90-degree square cross section: see symbol x3 in FIG. ) And is formed with a constant width, and serves to stabilize the box shape of the lid 13 and increase its strength.

As shown in FIG. 4, the top plate 13A is divided into vertical frame pieces 13Ay and 13Ay, horizontal frame pieces 13Ax and 13Ax, and an inner lid piece 13Az.
The vertical frame pieces 13Ay and 13Ay are connected to each other on both sides in the horizontal direction of the top plate 13A with a constant plate width inward of the plate surface, and the horizontal frame pieces 13Ax and 13Ax are arranged on the both sides in the vertical direction of the top plate 13A. It is connected from the side inward of the plate surface with the same plate width as the vertical frame piece 13Ay.

  At both ends of the vertical frame pieces 13Ay, 13Ay and the horizontal frame pieces 13Ax, 13Ax, sharp end faces f that divide a plate surface corner of the top plate 13A, that is, a right angle when the top plate 13A is viewed from the plane direction, into 45 °. Is formed. The rectangular frame bodies 13Ay, 13Ay, 13Ax, 13Ax including the four sides of the top plate 13A are formed by connecting the vertical frame pieces 13Ay, 13Ay and the acute-angle end surfaces f of the horizontal frame pieces 13Ax, 13Ax so as to coincide with each other.

  As shown in FIG. 3, the inner lid piece 13 </ b> Az is formed in a rectangular shape with dimensions that fit inside the frame bodies 13 </ b> Ay, 13 </ b> Ay, 13 </ b> Ax, 13 </ b> Ax. The horizontal dimension of the inner lid piece 13Az is set to be the same as the horizontal dimension on the inner side of the frame, and the vertical dimension of the inner lid piece 13Az is the length obtained by excluding the vertical width of the viewing window S of the lid 13 from the vertical dimension on the inner side of the frame. Is set.

  In this way, the top plate 13A is divided into each plate piece, so that the developed paper P1 has two parts including the side plate 13B and the vertical frame piece 13Ay, two parts including the end plate 13C and the horizontal frame piece 13Ax, and It is separated into a total of five parts that form the inner lid piece 13Az.

  When producing the development paper P1, each part of the development paper P1 is produced separately, and these are united. Hereinafter, the manufacturing method will be described.

  The two parts including the side plate 13B and the vertical frame piece 13Ay, and the two parts including the end plate 13C and the horizontal frame piece 13Ax can be manufactured using a common corrugated cardboard having a constant width.

When producing a part including the end plate 13C and the horizontal frame piece 13Ax, as shown in FIG. 5, first, a corrugated board Q1 having a constant plate width including the vertical dimension of the end plate 13C and the horizontal frame piece 13 is prepared. The lateral V grooves x1, x2 and the W groove x3 are formed while maintaining a predetermined plate width in the length direction of the corrugated board Q1.
The lateral V-grooves x1, x2 and the W-groove x3 can be formed by setting a dedicated rotary blade on the cutting machine and moving the rotary blade on the plate surface of the corrugated board Q1 to perform cutting. it can. In this case, if a necessary number of rotary blades are set according to the groove interval and a plurality of parallel grooves are simultaneously cut, each groove x1, x2, x3 can be finished in a short time with high accuracy. it can.

Next, the corrugated board Q1 is bent along the lateral V grooves x1, x2 and the W groove x3 to form a bent piece shown in FIG. The cross section of the bent piece has the same shape as the cross section obtained by bending the end plate 13C and the lateral frame piece 13Ax along each groove, as shown in the end view of FIG.
The portion of the bent piece corresponding to the horizontal frame piece 13Ax is faced upward, and the bent piece is cut along the vertical planes f1 and f1 while maintaining an angle of 45 ° with respect to the length direction. At this time, the part including the end plate 13C and the horizontal frame piece 13Ax is cut out by matching the interval between the vertical planes f1 and f1 with the horizontal dimension of the horizontal frame piece 13Ax. Then, when the folded part of this part is returned and expanded, the developed shape shown in FIG. 4 is obtained.

  Also in the case of producing a part including the side plate 13B and the vertical frame piece 13Ay, the same procedure as the method using the corrugated board Q1 described above can be used. In this case, when the bent piece produced from the corrugated cardboard plate Q1 is cut along the vertical planes f1 and f1, the side plate 13B and the vertical frame piece 13Ay are made to coincide with the vertical dimension of the vertical frame piece 13Ay. You can cut out the included parts. Then, when the folded part of this part is returned and expanded, the developed shape shown in FIG. 4 is obtained.

  Thus, among the parts of the developed paper, the parts including the vertical frame piece 13Ay and the side plate 13B, and the parts including the horizontal frame piece 13Ax and the end plate 13C have the same width because the plate width and the position of the V-groove coincide. By using the corrugated cardboard plate Q1 and V-groove machining with a constant width in the length direction of the corrugated cardboard plate Q1, the above parts can be easily produced with high dimensional accuracy.

  Further, when the parts of the developed paper are produced, the corrugated board Q1 having a certain width is folded along each V-groove or W-groove, and the top surface of the folded piece is turned upward so that the plate surface of the top plate 13A If cutting is performed on a vertical plane f1 having a 45 ° angle that equally divides the corner, this cut surface becomes the end face of the four corners K1 of the developed paper P1. For this reason, the end face of each plate in the four corners K1 of the developing paper P1 having the chamfered portion 13n can be finished very easily.

  Among the parts constituting the developing paper P1, for the inner lid piece 13Az, an appropriate corrugated cardboard plate is prepared and cut into a rectangle with a cutter or the like in accordance with the vertical and horizontal dimensions of the inner lid piece 13Az. By cutting the four sides of the inner lid piece 13Az perpendicularly to the plate surface, these end surfaces are connected to the inner end surface of the frame of the below-described top plate 13A without a gap.

As a method for combining the parts of the developing paper P1, for example, the parts are spread on a horizontal base with the V-groove side facing upward, and the vertical frame pieces 13Ay, 13Ay and the horizontal frame pieces are placed. The sharp end surfaces f and f of 13Ax and 13Ax are bonded together to form rectangular frames 13Ay, 13Ay, 13Ax, and 13Ax.
Next, the inner lid piece 13Az is fitted inside the frame bodies 13Ay, 13Ay, 13Ax, and 13Ax, and the end face of the inner lid piece 13Az is bonded and fixed to the end face of the frame body at a position where the viewing window S is secured. As a result, as shown in FIG. 3, a developed paper P1 having the same shape as the conventional developed paper P0 is completed.

  When assembling the development paper P1, as in the conventional development paper P0, the side plates 13B and the end plates 13C are bent along the vertical V grooves y1 and y2 and the horizontal V grooves x1 and x2 to bond the end faces of the plates together. 1 is completed.

  The manufacturing process of the lid 13 is not limited to the above procedure. For example, as shown in FIG. 7, the parts excluding the inner lid piece 13Az of the developing paper P1 are bent in advance along the vertical V grooves y1, y2 and the horizontal V grooves x1, x2, and these parts are joined to the inner lid piece 13Az. You may make it connect with four side end surfaces. In this case, when each part is turned upside down and the work is performed on a horizontal table, each part can be accurately connected to the plate surface of the top plate 13A.

  As described above, according to the present embodiment, the developing paper P1 of the lid 13 includes the parts including the vertical frame piece 13Ay and the side plate 13B, the parts including the horizontal frame piece 13Ax and the end plate 13C, and the parts including the inner lid piece 13Az. Therefore, it is easy to handle each part of the developing paper P1, and the processing work can be easily performed. Thereby, the lid 13 can be easily produced using a small cutting machine without using a dedicated large machine.

Further, when assembling the developing paper P1, the parts 13Ay, 13Ay, 13Ax, and 13Ax can be easily assembled by assembling the frames 13Ay, 13Ay, 13Ax, and 13Ax on the same plane by aligning the acute-angle end faces f and f of the vertical frame piece 13Ay and the horizontal frame piece 13Ax. Can be combined. For this reason, the assembling work of the spread paper P1 is not troublesome.

  Further, according to the developed paper P1, the side plate 13B and the end plate 13C bend along the vertical V grooves y1 and y2 and the horizontal V grooves x1 and x2 on each side of the top plate 13A with accurate dimensions. It can be accurately connected at an accurate position. For this reason, it is easy to obtain the dimensional accuracy at the connecting corners of each side of the top plate 13A, and the strength of the connecting corners can be sufficiently secured to improve the quality of the lid 13.

[Second Embodiment]
A second embodiment of the present invention is shown in FIGS.
In the second embodiment, the present invention is applied to a corrugated cardboard bowl having an octagonal planar shape. In the first embodiment described above, the present invention is applied to a corrugated cardboard cage having a square planar shape. However, as described below, the present invention can also be applied to a corrugated cardboard cage having a planar shape of an octagon. . This type of bag has a shape in which the four corners viewed from the plane direction of the corrugated cardboard bag are cut, and the surface constituting the bag shape is increased, resulting in a high-quality finish.
In the drawings of the second embodiment and other embodiments, the same reference numerals are given to substantially the same components as the components of the first embodiment.

  The corrugated cardboard cage 20 of the second embodiment has an octagonal bowl body 12 and a lid 13 as viewed from the plane direction (see FIG. 8). The bag body 12 and the lid 13 are made of thick reinforced corrugated cardboard material, and a lid 13 having a rectangular observation window S is placed on the upper end of the lid 13 so as to be openable. A window lid is fitted to the viewing window S as in the first embodiment.

  The lid 13 includes a top plate 13A, side plates 13B and 13B, and end plates 13C and 13C. A chamfered portion 13n is formed on the upper surface of the side plates 13B, 13B and the end plates 13C, 13C, and a folded portion 13m (see FIG. 9) is formed on the lower portion (opening end) of the plate surface. Corner members 13D are attached to the four corners of the top plate 13A to connect the side plate 13B and the end plate 13C with a plane.

FIG. 9 shows the developed paper P2 of the lid 13 excluding the corner member 13D.
The spread paper P1 is provided with side plates 13B and 13B with a vertical V-groove y1 on both lateral sides of the rectangular top plate 13A, and with the lateral plates 13C and 13C with a horizontal V-groove x1 on both sides in the vertical direction of the top plate 13A. Provided. The four corner portions K2 of the developing paper P1 have vertical end faces that form an angle of 90 ° when viewed from the plane direction in a direction extending the center lines of the vertical V groove y1 and the horizontal V groove x1.

A vertical V-groove y2 and a horizontal V-groove x2 are formed with a constant plate width on the boundary between the side plates 13B and 13B and the end plates 13C and 13C, which divides the chamfered portion 13n.
The vertical V grooves y1 and x1 and the horizontal V grooves y2 and x2 are cut on the plate surface of the developing paper P1 to have a V-shaped cross section of about 45 ° and are formed on the boundary lines of the respective plates.

As shown in FIG. 10, the top plate 13A is divided into vertical frame pieces 13Ay and 13Ay, horizontal frame pieces 13Ax and 13Ax, and an inner lid piece 13Az.
The vertical frame pieces 13Ay and 13Ay are connected to each other on both sides in the horizontal direction of the top plate 13A with a constant plate width inward of the plate surface, and the horizontal frame pieces 13Ax and 13Ax are arranged on the both sides in the vertical direction of the top plate 13A. It is connected from the side inward of the plate surface with the same plate width as the vertical frame piece 13Ay.

  At both ends of the vertical frame pieces 13Ay, 13Ay and the horizontal frame pieces 13Ax, 13Ax, sharp end faces f that divide a plate surface corner of the top plate 13A, that is, a right angle when the top plate 13A is viewed from the plane direction, into 45 °. Is formed. By connecting the vertical frame pieces 13Ay, 13Ay and the acute-angle end faces f of the horizontal frame pieces 13Ax, 13Ax so as to coincide with each other, rectangular frame bodies 13Ay, 13Ay, 13Ax, 13Ax including the four sides of the top plate 13A are obtained.

  As shown in FIG. 3, the inner lid piece 13 </ b> Az is formed in a rectangular shape with dimensions that fit inside the frame bodies 13 </ b> Ay, 13 </ b> Ay, 13 </ b> Ax, 13 </ b> Ax. The horizontal dimension of the inner lid piece 13Az is set to be the same as the horizontal dimension on the inner side of the frame, and the vertical dimension of the inner lid piece 13Az is the length obtained by excluding the vertical width of the viewing window S of the lid 13 from the vertical dimension on the inner side of the frame. Is set.

  In this way, the top plate 13A is divided into each plate piece, so that the developed paper P2 includes two parts including the side plate 13B and the vertical frame piece 13Ay, two parts including the end plate 13C and the horizontal frame piece 13Ax, and It is separated into a total of five parts including the inner lid piece 13Az.

When producing the development paper P2, as in the first embodiment, each part of the development paper P2 is produced separately and united.
The two parts including the side plate 13B and the vertical frame piece 13Ay, and the two parts including the end plate 13C and the horizontal frame piece 13Ax can be manufactured using a common corrugated cardboard having a constant width.

  When producing a part including the end plate 13C and the horizontal frame piece 13Ax, as shown in FIG. 11, first, a corrugated cardboard plate Q2 having a constant plate width including the vertical dimension of the end plate 13C and the horizontal frame piece 13 is prepared. The lateral V grooves x1, x2 and the W groove x3 are formed while maintaining a predetermined plate width in the length direction of the plate Q2.

  Next, the corrugated board Q2 is cut along the vertical plane f2 in accordance with the length dimension (lateral dimension) of the horizontal frame piece 13Ax, and the corner portion of the corrugated board board corresponding to the horizontal frame piece 13Ax is cut in the length direction. Cut at vertical planes f1 and f1 while maintaining an angle of 45 °. As a result, a part including the unfolded end plate 13C and the lateral frame piece 13Ax shown in FIG. 10 is formed.

  Even when a part including the side plate 13B and the vertical frame piece 13Ay is manufactured, the same procedure as that of the method using the corrugated board Q2 described above can be used. In this case, a part including the side plate 13B and the vertical frame piece 13Ay is formed by matching the length of the cardboard plate Q2 cut along the vertical plane f2 with the length dimension (vertical dimension) of the vertical frame piece 13Ay.

  Thus, among the parts of the developed paper P2, the parts including the vertical frame piece 13Ay and the side plate 13B and the parts including the horizontal frame piece 13Ax and the end plate 13C are the same because the plate width and the position of the V-groove match. By using a corrugated board Q2 having a width and V-groove machining with a constant width in the length direction of the corrugated board Q2, the above parts can be easily produced with high dimensional accuracy.

  Among the parts constituting the developing paper P2, the inner lid piece 13Az can be produced in the same manner as in the first embodiment. That is, an appropriate corrugated board is prepared and cut into a rectangle with a cutter or the like according to the vertical dimension and the horizontal dimension of the inner lid piece 13Az.

As in the case of the first embodiment, the parts of the developing paper P2 are placed on a horizontal base with the grooved surface facing up, and the vertical frame pieces 13Ay and 13Ay of the top plate 13A and the horizontal frame are combined. The acute angle end faces f of the pieces 13Ax and 13Ax are bonded together to form a rectangular frame.
Next, when the inner lid piece 13Az is fitted inside the frame body, and the end face of the inner lid piece 13Az is adhered and fixed to the end face of the frame body at a position where the observation window S is secured, the developed paper P2 shown in FIG. 9 is obtained. . In FIG. 9, the folded portion 13m is folded, but the folded portion 13m may be folded before or after the parts of the developing paper P2 are combined.

  The corner member 13D of the lid 13 is manufactured by using a corrugated board in which a portion corresponding to the vertical frame piece 13Ay of the corrugated board Q2 shown in FIG. 11 is separated by the center line of the lateral V groove x1. As shown in FIG. 12, the remaining corrugated board Q3 is bent along the lateral V-groove x2 and the W-groove x3, and the bent piece is viewed from the plane direction, maintaining an angle of 45 ° with respect to the length direction. And cut along the vertical planes f4 and f4. As a result, a corner member 13D that matches the dimensions of the four corners K2 of the developing paper P2 is obtained.

  At the time of assembling the spread paper P2, the side plate 13B and the end plate 13C are bent along the vertical V grooves y1, y2 and the horizontal V grooves x1, x2, and the corner member 13D is formed on the end surface of the four corners K2 of the spread paper P2. When the end faces are bonded, the box-shaped lid 13 shown in FIG. 8 is completed.

  Thus, also in the second embodiment, the developed paper P2 of the lid 13 includes parts including the vertical frame piece 13Ay and the side plate 13B of the top plate 13A, parts including the horizontal frame piece 13Ax and the end plate 13C of the top plate 13A, Since it is divided into parts including the inner lid piece 13Az, it is easy to handle each part for producing the developing paper P2, and the processing work can be performed easily. Thereby, even if it does not use an exclusive large sized machine, the corrugated board 20 can be produced easily using a small cutting machine.

  Further, when assembling the developing paper P2, the parts 13Ay, 13Ay, 13Ax, and 13Ax can be assembled easily by assembling the frame bodies 13Ay, 13Ay, 13Ax, and 13Ax on the same plane by aligning the acute-angle end faces f and f of the vertical and horizontal frame pieces 13Ay Can be combined. For this reason, the assembling work of the developing paper P2 is not troublesome.

  Further, according to the developed paper P2, the side plate 13B and the end plate 13C bend along the vertical V grooves y1 and y2 and the horizontal V grooves x1 and x2 along each side of the top plate 13A with accurate dimensions. It can be accurately connected at an accurate position. For this reason, it is easy to obtain the dimensional accuracy at the connecting corners of each side of the top plate 13A, and the strength of the connecting corners can be sufficiently secured to improve the quality of the lid 13.

[Other Embodiments]
Although the first and second embodiments have been described above, the embodiments of the present invention are not limited to these, and various modifications and changes may be involved.
For example, as shown in a lid 30 in FIG. 13A, the size of the inner lid piece 13Az may be reduced by increasing the plate width of the chamfered portion 13n. By shortening the plate width of the inner lid piece 13Az, all parts of the developed paper can be produced from a relatively narrow corrugated cardboard plate.
As shown in the lid 40 of FIG. 13 (B), the chamfered portion 13n may be omitted. According to the configuration in which the chamfered portion 13n is omitted, the number of bending V-grooves can be minimized, and the development of the developed paper is further simplified.
As shown in the lid 50 of FIG. 13C, the chamfered portion 13n may be formed by a plurality of inclined surfaces having different angles. By increasing the slope of the chamfered portion 13n in this way, the three-dimensional feeling of the lid 50 can be improved, and the sense of quality of the cardboard box can be further enhanced.

In the first and second embodiments, the inner lid piece 13Az is connected to the inner end faces of the frames 13Ay, 13Ay, 13Ax, and 13Ax. However, the lid 60 in FIG. ) And the lid 80 of FIG. 14C, the lower surface of the middle lid piece 13Az may be bonded and connected to the upper surface of the frame.
In such a configuration, since the inner lid piece 13Az is supported by the top surface of the frame body, the configuration of the top plate portion becomes more robust. Moreover, it is not necessary to produce the inner lid piece 13Az according to the inner dimensions of the frame, and the production of the inner lid piece 13Az can be facilitated. It is also possible to change the inner lid piece 13Az to a desired shape and adopt a three-dimensional complex shape for the top plate 13A.

  Furthermore, as shown in FIG. 15, the present invention can also be applied to a bag body 90 of a cardboard box. In the example of FIG. 15, a structure (top plate structure) including frame bodies 13 </ b> Ay and 13 </ b> Ay (13 </ b> Ax, 13 </ b> Ax: not shown) and an inner lid piece 13 </ b> Az is adopted for the bottom plate portion of the bag main body 90. In this case, the load bearing performance of the bag main body 90 can be sufficiently secured by connecting the lower surface of the inner lid piece 13Az to the upper surface of the frame.

In addition, in 1st and 2nd embodiment, although the folding | turning part is provided in the side plate and the end plate, such a folding | returning part does not necessarily need to be provided and may be abbreviate | omitted as needed.
Further, the corrugated cardboard material for producing the developed paper is not limited to the three-layer reinforced corrugated cardboard, and other multilayer corrugated cardboard material, a corrugated cardboard material having a honeycomb structure, or the like may be used.

It is a perspective view which shows the corrugated board bag of 1st Embodiment of this invention. FIG. 2 is a sectional view taken along the line II-II in FIG. 1 and an enlarged sectional view of an R portion, showing the corrugated cardboard cage. It is the top view which shows the expansion | deployment paper of the lid | cover of the corrugated cardboard basket, and sectional drawing of the broken line direction. It is a top view which shows the state which divided | segmented the expansion | deployment paper for every part. It is the top view which shows the corrugated cardboard for producing the same development paper, and the end elevation of the broken line direction. It is the top view which shows the state which bent the corrugated cardboard board of FIG. 5, and the end elevation of the broken line direction. It is a disassembled perspective view which shows the lid | cover of the corrugated board bag. It is a perspective view which shows the cardboard box of 2nd Embodiment of this invention. It is the top view which shows the expansion | deployment paper of the lid | cover of the corrugated cardboard basket, and sectional drawing of the broken line direction. It is a top view which shows the state which divided | segmented the expansion | deployment paper for every part. It is the top view which shows the corrugated cardboard for producing the same development paper, and the end elevation of the broken line direction. FIG. 2 is a plan view illustrating a state in which a corrugated board is bent, and an end view in the direction of a broken line, illustrating a method for producing corner members at four corners of the developed paper. It explains other embodiment of this invention, and is sectional drawing which shows the various modifications of a chamfer part. It explains other embodiment of this invention, and is sectional drawing which shows the various modifications of a top-plate part. It explains other embodiment of the present invention and is a cross-sectional view showing a bag main body to which a top plate structure according to the present invention is applied. It is a perspective view which shows the conventional cardboard bag. It is the top view which shows the expansion | deployment paper of the lid | cover of the corrugated cardboard basket, and sectional drawing of a broken line direction.

Explanation of symbols

10 Corrugated cardboard cage (first embodiment)
12 棺 body 13 Lid 13A Top plate 13Ay Vertical frame piece 13Ax Horizontal frame piece 13Az Middle lid piece 13n Chamfered portion 13m Folded portion 13B Side plate 13C End plate 13D Square member 20 Corrugated cardboard ridge (second embodiment)
S Viewing window f Sharp end face f1 to f4 Vertical plane P1, P2 Expanded paper Q1 to Q3 Corrugated board x1, x2 Horizontal V groove x3 W groove y1, y2 Vertical V groove

Claims (5)

In a corrugated cardboard box provided with a box-shaped bag body and a lid that can be opened on the bag body,
The lid is
With the top plate,
Side plates provided on both lateral sides of the top plate;
It is provided with twill plates provided on both sides in the longitudinal direction of the top plate,
The developed paper including the top plate, the side plate and the end plate is folded along a V-groove formed at the boundary of each plate and assembled into a box shape,

The top plate is
A vertical frame piece provided on the side plate across the V-groove and continuous from each side on both sides of the top plate inward to the plate surface with a constant plate width;
A horizontal frame piece provided on the end plate across the V-groove, and extending from each side on both sides in the vertical direction of the top plate to the inside of the plate surface with a constant plate width;
An inner lid piece connected to the inside of a frame body composed of the vertical frame piece and the horizontal frame piece,
Furthermore, the both ends of the vertical frame piece and the horizontal frame piece divide the corners of the plate surface of the top plate, the parts including the side plate and the vertical frame piece, and the parts including the end plate and the horizontal frame piece. And an acute angle end face is formed to divide

When producing the spread paper, the frame body is formed by connecting the acute angle end surface of the vertical frame piece and the acute angle end surface of the horizontal frame piece so as to coincide with each other on the same plane, and the frame is formed through the frame. The corrugated cardboard bag is configured such that the development paper is formed by combining the parts including a side plate and the vertical frame piece and the parts including the end plate and the horizontal frame piece . Top plate structure. 2. The top plate structure of the cardboard box according to claim 1, wherein the frame body made of the vertical frame piece and the horizontal frame piece is set to have a constant plate width.   The top plate structure of the corrugated board basket according to claim 2, wherein the connecting surface between the side plate and the end plate at the time of assembling the spread paper is the vertical frame piece and the horizontal frame as viewed from the plane direction of the top plate. A top plate structure of a corrugated cardboard bowl that coincides with the connecting surface of the sharp end faces with the piece on the same plane.   It is a top plate structure of the corrugated board basket as described in any one of Claims 1-3, Comprising: The lower surface of the said inner cover piece is connected with the upper surface of the said frame body which consists of the said vertical frame piece and the said horizontal frame piece. The top board structure of corrugated cardboard bowl.   A cardboard box provided with the top plate structure according to any one of claims 1 to 4.

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