JP6708221B2 - Tubular - Google Patents

Description

The present invention relates to a joining structure of two surface portions and a folding box having this joining structure.

Various structures are made by cutting cardboard, cardboard, plastic sheets, etc. into a predetermined development shape and bending or curving the cut cardboard, etc. as appropriate. For example, a folding box is used to store food including confectionery such as caramel, chocolate, and hard candy, stationery such as clips and pushpins, toys such as marbles and hajiki, daily necessities, cosmetics, and other articles or products. A relatively simple folding box often uses a sack box with insertion lids (insertion flaps) on the top and bottom surfaces. The sack box is one in which the upper and lower surfaces of the box are closed by inserting the insertion flaps, and can be easily opened.

There is a demand for opening the sack box by tearing the body of the sack box and keeping the upper and lower surfaces of the sack box closed. In order to keep the top and bottom surfaces closed, the bayonet flap is typically glued to the box with an adhesive. However, this naturally requires an adhesive application process.

Patent document 1 describes what connects the front side wall plate provided with a fitting piece and the insertion piece provided with a cutting line by inserting a fitting piece in a cutting line. Since the engagement is achieved by the end surface (engagement portion) of the fitting piece and the end surface (removal prevention engagement portion) of the insertion engagement piece (FIG. 5(b)), the positional relationship between them is slightly displaced. Will be disengaged.

Utility model registration No. 3092497

SUMMARY OF THE INVENTION It is an object of the present invention to provide a joining structure of two surface portions that cannot be basically released from the joining without using an adhesive, and a folding box having this joining structure.

The invention further aims at making it possible to easily find the fact that the connection has been released, for example, the fact that the tampering has been carried out.

The connecting structure according to the present invention is a structure in which two sheet surface portions to be connected are connected to each other in a state in which they partially overlap each other.

In the joining structure according to the present invention, the first and second seat surface portions are joined at their ends. You may join the both ends of one sheet surface part. In this case, the two seat surface portions indicate one end portion and the other end portion (half of one seat surface portion) of one seat surface portion.

An insert engagement piece is formed at the end of the first seat surface portion. The plug-in engagement piece has a head and a neck that is continuous with the head and is narrower than the head. A notch is formed near the end of the second seat surface portion so that the insertion engaging piece is inserted from the head portion of the second seat surface portion. The second seat surface portion is further moved so that the end portion of the second seat surface portion is continuous with the cut and the first and second seat surface portions are separated from each other. A pair of engaged edge portions that engage with each other at the end surfaces of the left and right edge portions of the neck portion of the plug-in engagement piece are formed.

According to this invention, the insertion engaging piece of the first seat surface portion is inserted into the notch of the second seat surface portion, and then the second seat surface portion is separated from the first seat surface portion, or the second seat surface portion is separated. When attempting to separate the first seat surface portion from the seat surface portion, the left and right edge portions of the neck portion of the insertion engaging piece of the first seat surface portion engage with the engaged edge portion of the second seat surface portion. The plug-in engagement piece does not pass through the notch again and the plug-in engagement piece does not come out (the connection between the first seat surface portion and the second seat surface portion is disconnected). The two sheet surface portions can be held in a state of being joined to each other. Since the engaged edge portions of the second seat surface portion engage with the left and right edge portions of the neck portion of the insertion engaging piece of the first seat surface portion, the width of the pair of engaged edge portions of the second seat surface portion. Needless to say, has a portion narrower than the head portion of the insertion engaging piece of the first seat surface portion and wider than the width of the neck portion.

Here, the pair of engaged edge portions are formed so as to become narrower toward the end portion of the second seat surface portion. When trying to move the first seat surface portion and the second seat surface portion away from each other, the end surfaces of the left and right edge portions of the neck portion can be immediately engaged with the end surface of the engaged edge portion. (The distance that can be moved when the first seat surface portion and the second seat surface portion are trying to separate from each other) can be almost eliminated.

For even the neck portion, it is formed wider toward the head (the end of the first sheet surface). This also contributes to eliminating the above-mentioned play.

In one embodiment, a mouth (hole) connected to the cut is formed along the part of the cut in the second sheet surface portion, and both side edges of the mouth serve as the pair of engaged edges. Used. By forming an opening connected to the cut along a part of the cut, the engaging piece can be easily inserted into the cut.

Preferably, a slit is formed in a direction connecting the left and right edges of the neck to a position near the left and right edges of the neck. Since the neck portion is torn when the first seat surface portion and the second seat surface portion are forcibly separated from each other, the connecting structure of the first seat surface portion and the second seat surface portion cannot be reused. In addition, when the first sheet surface portion and the second sheet surface portion are used for the folding box, a trace that the folding box has been illegally opened can be left, so that it can be confirmed that the folding box has been illegally opened.

The folding box according to the present invention is provided with an insertion flap which is inserted into the box at the time of closing the opening on at least one of the upper surface and the lower surface of the folding box. A head and a plug engagement piece continuous with the head and having a neck narrower than the head are formed at the ends, and the plug engagement piece is provided near the end of the plug flap. Has a notch inserted from its head, and the end of the insertion flap is continuous with the notch, and the insertion is made when the insertion flap is moved in the direction in which the insertion flap is pulled out. Each of the left and right edge portions of the neck portion of the engagement piece is formed with a pair of engaged edge portions that engage with each other at their end surfaces .

When attempting to pull out the insertion flap from the folding box, the left and right edges of the neck of the insertion engagement piece engage with the engaged edges of the insertion flap, so that the folding box (the surface of the folding box overlapping the insertion flap) and the insertion flap are The bond will not come off. The top or bottom of the folding box can be kept closed without the use of adhesive.

It is a development view of a folding box. It is a perspective view of a folding box. It is a partially expanded view of the upper part of a folding box. It is what looked at the folding box shown in FIG. 3 from the inside. It is a partially expanded perspective view of the folding box seen from the inside shown in FIG. It is a development view of a cylindrical body. It is a front view of a cylindrical body.

FIG. 1 is a development view of a folding box according to an embodiment. The folding box is assembled by bending a sheet 1A obtained by cutting a sheet-shaped material such as cardboard or a plastic sheet into the shape of the development view shown in FIG. In the development view shown in FIG. 1, a portion which is bent when the folding box is assembled is shown by a chain line. If necessary, creases or shallow cuts are made at the places indicated by the chain lines. FIG. 2 is a perspective view of the entire folding box 1B assembled from the sheet 1A shown in FIG. 1 from the back side. FIG. 3 is an enlarged view of the upper end of the folding box 1B as viewed from the back side. FIG. 4 shows the folding box 1B shown in FIG. 3 viewed from the opposite side (viewing from the inside of the folding box 1B).

Referring to FIG. 1, a left side surface portion 13 and a right side surface portion 14 are connected to both ends (left and right sides), which are long sides of a rectangular front surface portion 11, respectively. Small flaps 21 are continuous to the upper and lower ends of the left side surface portion 13 and the right side surface portion 14, respectively. The rear surface portion 12 is connected to the left end of the left side surface portion 13, and the margin portion 15 is connected to the left end of the rear surface portion 12. An upper surface 16 is connected to the upper end, which is a short side of the front surface 11, and an insertion flap 40 having both rounded corners is further connected to the upper end of the upper surface 16. The lower end of the front face part 11 is also the same, and the lower face part 17 is continuous with the lower end of the front face part 11, and the insertion flap 40 is further continuous with the lower end of the lower face part 17.

A notch 41 is formed laterally at approximately the center of the insertion flap 40. On the other hand, insertion engaging pieces 30 are formed on each of the upper end and the lower end of the back surface part 12. Although the details will be described later, by inserting the insertion engaging piece 30 into the notch 41 of the insertion flap 40, the insertion flap 40 and the insertion engaging piece 30 (back surface portion 12) are coupled (connected). Hereinafter, the notch 41 on the insertion flap 40 into which the insertion engagement piece 30 is inserted will be referred to as an insertion notch 41. The insertion notch 41 of the insertion flap 40 connected to the upper surface portion 16 has the insertion engagement piece 30 at the upper end of the rear surface portion 12, and the insertion notch 41 of the insertion flap 40 connected to the lower surface portion 17 has the lower end of the rear surface portion 12 inserted. The engagement piece 30 is inserted. It should be noted that FIG. 1 shows the insertion flap 40 before being bent, and when the insertion flap 40 is coupled with the insertion engagement piece 30 (back surface portion 12), the insertion flap 40 should be bent to be in an upside down posture. Please note.

The insertion engaging pieces 30 at the upper and lower ends of the back surface portion 12 are located substantially at the center of the back surface portion 12 in the left-right direction, and a part of the upper and lower end portions of the back surface portion 12 are cut out and cut lines (slits). It is formed by putting. The plug-in engagement piece 30 has a generally triangular head portion 30a having a shape protruding outward and a short neck portion 30b connected to the head portion 30a. The left and right edge portions 31 of the neck portion 30b are obliquely shortened so as to become wider toward the head portion 30a (the end portion of the back surface portion 12).

Furthermore, a slit 32 is formed in the neck portion 30b of the plug-in engagement piece 30 in the lateral direction. Both ends of the slit 32 reach positions near the left and right edges of the neck portion 30b. The slit 32 inserted in the neck portion 30b is hereinafter referred to as a weak portion forming slit 32.

The insertion notch 41 formed in the insertion flap 40 is also located substantially at the center of the insertion flap 40 in the left-right direction. The center of the insertion notch 41 is curved so as to slightly bulge toward the tip of the insertion flap 40, and the bulged portion formed by this bending is hereinafter referred to as a pushing portion 42. The length (distance between both ends) of the insertion notch 41 is slightly longer than the width of the insertion engagement piece 30 (the maximum width of the head portion 30a).

The insertion flap 40 has a pair of slits 43, one end of which is connected to the insertion notch 41 and the other end of which extends toward the end of the insertion flap 40 and which is gradually inclined so as to approach each other. It is formed by opening. As will be described later, the left and right edge portions 31 of the neck portion 30b of the insertion engaging piece 30 described above are engaged with a pair of slits 43 (edge portions formed by the pair of slits 43) formed in the insertion flap 40. .. The pair of slits 43 formed in the insertion flap 40 are hereinafter referred to as engaged edge portions 43. The interval between the pair of engaged edge portions 43 is the widest at the portion connected to the insertion notch 41. The width between the pair of engaged edge portions 43 at the widest distance is the same as the maximum width of the neck portion 30b (the distance between the left and right edge portions 31 at the boundary portion between the head portion 30a and the neck portion 30b). Or slightly wider.

The insertion flap 40 is also provided with perforations 44 such that the narrow ends of the pair of engaged edge portions 43 are connected to each other. The trapezoidal range surrounded by the perforations 44, the pair of engaged edges 43 and the insertion notches 41 is hereinafter referred to as a mouth opening panel 45.

The opening panel 45 may be connected to the insertion flap 40 at the perforations 44, or may be separated from the insertion flap 40 at the perforations 44. When separated from the insertion flap 40, a substantially trapezoidal opening (hole) is formed in the area of the opening panel 45.

A process of assembling the folding box 1B shown in FIG. 2 using the sheet 1A shown in FIG. 1 will be described. First, the margin portion 15 coated with the adhesive N is attached to the inner surface of the right side surface portion 14 and opened, so that the margin portion 15, the back surface portion 12, the left side surface portion 13, the front surface portion 11 and the right side surface portion 14 are adjacent to each other. It is bent at a right angle between the parts to form a rectangular tube-shaped body that is open at the top and bottom.

The top or bottom surface is closed. Explaining the process of closing the upper surface, the left and right flaps 21 are bent inward at a right angle, the insertion flaps 40 connected to the upper surface 16 are then bent inward, and the upper surface 16 connected to the front surface 11 is further bent inward. The insertion flap 40 is inserted inside the rectangular tubular body, that is, inside the back surface 12.

While inserting the insertion flap 40 into the inside of the rectangular tubular body, the mouth opening panel 45 is pushed diagonally inward, and the insertion engagement piece 30 at the upper end of the rear surface 12 is inserted from the insertion notch 41 to the insertion flap 40. Insert inside the. The plug-in engagement piece 30 slightly enters the inside of the rectangular tubular body. When the insertion engaging piece 30 is inserted into the insertion notch 41, the insertion portion 30 can be smoothly inserted into the insertion notch 41 by lightly pressing the pressing portion 42 from above. This closes the upper surface of the rectangular tubular body. After inserting the contents from the open lower surface of the rectangular tubular body, close the lower surface in the same manner as the upper surface. The folding box 1B is completed.

FIG. 5 is an enlarged perspective view of the upper end of the folding box 1B as viewed from the inside of the folding box 1B. In FIG. 5, the illustration of the opening panel 45 is omitted.

The insertion engaging piece 30 inserted into the folding box 1B from the insertion notch 41 of the insertion flap 40 has its neck portion 30b slanted inward, and the left and right edges 31 of the neck portion 30b have a pair of insertion flaps 40. It is sandwiched between the engaged edge portions 43 of. The insertion flap 40 inserted inside the folding box 1B cannot be pulled out, and once the upper and lower surfaces are closed, the upper and lower surfaces of the folding box 1B cannot be opened unless the folding box 1B is forcibly broken. Surfaces other than the upper and lower surfaces are used to open the folding box 1B. For example, a zipper portion (not shown) is formed laterally from the front surface portion 11 to the left and right side surface portions 13 and 14, or from the front surface portion 11, the left and right side surface portions 13 and 14, and the back surface portion 12 (over the entire circumference). The folding box 1B is opened by tearing the zipper portion.

With reference to FIG. 5, when the insertion flap 40 is moved in the direction of coming out of the folding box 1B, the insertion flap 40 and the insertion engagement piece 30 are moved in directions away from each other. The left and right edge portions 31 of the neck portion 30b of the insertion engaging piece 30 engage with the pair of engaged edge portions 43 formed on the insertion flap 40. Here, the left and right edge portions 31 of the neck portion 30b and the pair of engaged edge portions 43 of the insertion flap 40 are both formed obliquely, and when the insertion engagement piece 30 and the insertion flap 40 are moved away from each other. The wide portion of the neck portion 30b is directed toward the narrow portion of the pair of engaged edge portions 43 of the insertion flap 40. Therefore, when the inserting flap 40 is to be pulled out in the direction of coming out of the folding box 1B, the left and right edge portions 31 of the neck portion 30b are engaged with the engaged edge portions 43 of the inserting flap 40 immediately after the movement. The play (range in which it can be moved) of the insertion flap 40 can be almost eliminated.

When the insertion flap 40 is pulled out with a strong force in the direction of coming out of the folding box 1B, the insertion engaging piece 30 has the weak portion forming slit 32. Therefore, the insertion engaging piece 30 has the weak portion forming slit 32 at the folding box 1B (back surface). It is separated from the part 12). The reason why the folding box 1B is illegally opened can be left, and it can be confirmed that the folding box 1B has been illegally opened.

The structure (coupling structure) in which the insertion engaging piece 30 is inserted into the insertion notch 41 and the surface portion having the insertion engaging piece 30 and the surface portion having the insertion notch 41 are combined is not only a folded box but also another structure. Can also be applied in.

FIG. 6 is a development view of the cylindrical assembly sheet 2A. FIG. 7 shows a cylindrical body 2B assembled from the sheet 2A shown in FIG. The sheet 2A has an upper edge and a lower edge that are curved in an arc shape, and the length of the upper edge is longer than the length of the lower edge. When the sheet 2A is curved and the one end portion and the other end portion are overlapped with each other, a cylindrical body 2B having a larger diameter in the upper portion and a smaller diameter in the lower portion is formed.

An insert engagement piece 30 is formed at one end of the seat 2A, and an insert notch 41 is formed at the other end. The one end and the other end of the sheet 2A can be kept in a superposed state without using an adhesive, and the shape of the cylindrical body 2B can be maintained.

1A Folded Box Blank 1B Folded Box 2A Cylinder Blank 2B Cylinder
11 Front
12 Rear
13 Left side
14 Right side
16 Top part
17 Lower surface
30 Plug-in engagement piece
30a head
30b neck
31 Left and right edges
32 Weak part forming slit
40 bayonet flaps
41 Notch for insertion
43 Engaged edge

Claims (3)

A tubular body formed by joining one end portion and the other end portion of one seat surface portion to each other in a state where they partially overlap each other,
A head (30a) and a plug-in engagement piece (30) continuous with the head (30a) and having a neck (30b) narrower than the head (30a) are formed at one end of the seat surface portion. Has been done,
Near the other end of the seat surface,
A notch (41) into which the insertion engaging piece (30) is inserted from its head (30a),
A pair of engaged edge portions (43), one end of which is continuous with the cutout (41), and the other end of which is extended from the cutout (41) at the other end of the seat surface portion.
Perforations (44) connecting the other ends of the pair of engaged edge portions (43) are formed,
Formed by cutting out the trapezoidal opening panel (45) or the trapezoidal opening panel (45) surrounded by the notch (41), the pair of engaged edges (43) and the perforations (44). A trapezoidal opening is defined on the other end of the seat surface,
The pair of engaged edge portions (43) are gradually narrowed toward the other end of the seat surface portion without widening in the middle, and the left and right edge portions (31) of the neck portion (30b) are formed. Is gradually widened toward the head (30a) without narrowing in the middle,
The maximum distance between the pair of engaged edge portions (43) defining the trapezoidal opening panel (45) or the hypotenuse of the trapezoidal opening is larger than the maximum distance between the left and right edge portions (31) of the neck portion (30b). Slightly wider,
After the head portion (30a) is inserted into the trapezoidal opening panel (45) or the trapezoidal opening, when the one end portion and the other end portion of the seat surface portion are moved so as to be separated from each other, The left and right edge portions (31) of the neck portion (30b) of the insertion engaging piece (30) engage with the pair of engaged edge portions (43) at their end faces.
Tubular body. The trapezoidal opening panel (45) or both side edges of the trapezoidal opening are the pair of engaged edge portions (43),
The tubular body according to claim 1. A slit (32) is formed in a direction close to the left and right edges of the neck so as to connect the left and right edges of the neck.
The tubular body according to claim 1.

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