JP5268525B2 - Case sealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a case sealing structure which is excellent in sealing performance and opening prevention performance. <P>SOLUTION: Upper and lower folding flaps 1Db and 1Db of a left side wall part 1D of a case A assembled like a square tube and upper and lower folding flaps 1Eb and 1Eb of a right side wall part 1E of the case A are each folded inward and are superposed alternately in a vertical direction so that abutting portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb abut on right and left upper ends and right and left lower ends of a front side wall part 1F. An upper lid part 1B and a bottom lid part 1C are each folded inward so as to be laid over the folding flaps 1Db and 1Eb. Insertion flaps 1Ba and 1Ca of the upper lid part 1B and the bottom lid part 1C are inserted between the front side wall part 1F and the folding flaps 1Db and 1Eb so that right and left ends of the insertion flaps 1Ba and 1Ca are anchored to the rear surfaces of the abutting portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb abutting on the right and left upper ends and the right and left lower ends of the front side wall part 1F. By this, the case sealing structure is formed. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a case sealing structure used when accommodating objects such as cosmetics, cigarettes, stationery, toys, food, cutlery, and cooking utensils.

  Conventionally, as a structure for sealing the case, for example, the folding flaps connected to the upper and lower ends of both side walls of the case assembled in a rectangular tube shape are folded inward and overlapped vertically. After this, the upper and lower lids connected to the upper and lower ends of the rear side wall are folded inward and overlapped on the left and right flaps that are bent first, and are connected to the lids. There is a structure in which the inserted flap is inserted and sealed between the front side wall portion and each folded flap. However, a gap for inserting a finger, a nail or the like is formed between the insertion flap and the front side wall portion in order to facilitate the opening of the lid portion, but the retaining resistance applied to the insertion flap is small. Therefore, the insertion flap may be pulled out by the restoring force of the lid itself, and the insertion state cannot be maintained. Further, the insertion flap connected to the bottom side lid portion is curved inward due to the weight of the object accommodated in the case, and a large gap is formed between the inner wall surface of the front side wall portion and the insertion flap of the bottom lid portion. Is formed. As a result, the locking amount of the insertion flap of the bottom lid portion with respect to each folding flap provided continuously to the lower ends of the both side wall portions becomes shallow, and the insertion flap of the bottom lid portion becomes easy to come out, so that it is accommodated in the case. Containment may fall out.

As another structure, the inner lid flap and the intermediate lid flap connected to the upper end of the wall portion of the case are bent inward in order, and the insertion piece formed at the tip of the intermediate lid flap is connected to the side wall and the inner lid of the main body. Insert between the flaps. After that, there is a case of Patent Document 1 in which the outer lid flap is bent inward and an insertion piece formed at the tip of the outer lid flap is inserted into an insertion hole formed in the side wall of the main body and sealed. However, since the structure of the case itself is complicated, it takes time and labor to manufacture a mold used for punching a case having a developed shape, and the cost for manufacturing the case increases.
Utility model registration No. 3101939

  In view of the above problems, an object of the present invention is to provide a case sealing structure having good sealing properties and excellent anti-opening properties.

This invention folds the left and right folding flaps connected to the upper and lower ends of both side walls of the case assembled into a rectangular tube shape and folds them inward, and then superimposes them on the upper and lower ends of the rear side wall. The upper and lower lids that are connected inward are folded inward and overlapped with each folding flap, and the insertion flap that is connected to the tip of each lid is inserted between the front side wall and each folding flap and sealed A case sealing structure, wherein the front ends of the respective lid portions are formed along the upper and lower ends of the front side wall portions, and the respective folding flaps are arranged at the ends corresponding to the insertion flaps of the respective folding flaps. A contact portion that is in contact with an end portion of the front side wall portion on the side where the insertion flap is inserted, and the front end of the lid portion is formed on both sides of the insertion flap. Along the left and right folding flanges Wider than the thickness of the thick or one folded flap formed by superposed flop, the engagement between the abutment acceptable Merged upon between the difference inclusive flap and said front wall said each folding flap It is the case sealing structure in which the notch part formed was formed .

  As an aspect of the present invention, the front ends of the lid portions can be formed in parallel along the upper and lower ends of the front side wall portion.

As an aspect of the present invention, the tip of each lid can be formed in a shape that protrudes forward along the upper and lower ends of the front side wall. Note that the shape protruding forward includes, for example, an arc shape, a trapezoidal shape, a square shape, and the like.

In addition, as an aspect of the present invention, the abutment portion is formed at each end portion of the folding flap connected to the upper end and the lower end of the both side wall portions on the side corresponding to the insertion flap, and the front side wall portion. The insertion flap can be formed in a size to be in contact with the upper end and the lower end on the side where the insertion flap is inserted .

  As an aspect of the present invention, the projecting dimension of the contact portion can be formed to a dimension corresponding to the thickness of the sheet constituting the case.

  Further, as an aspect of the present invention, the lateral width of the insertion flap can be formed narrower than the lateral width in the case into which the insertion flap is inserted.

  Further, as an aspect of the present invention, the lateral width of the insertion flap can be formed wider than the lateral width in the case into which the insertion flap is inserted.

Further, as an aspect of the present invention, the thickness of the bottom of the folding ruled line formed in the folded part of the insertion flap and the upper lid part is allowed to tear along the folded ruled line in the length direction. However, a thin thin part can be formed.

As an aspect of the present invention, a tearing portion penetrating in the thickness direction along the folding ruled line can be formed in the folding ruled line formed at the bent portion of the insertion flap and the upper lid part.

  As an aspect of the present invention, the contact portion can be formed at a position spaced from the bent portion of the folding flap at a predetermined interval.

  The said to-be-contained object can be comprised with cosmetics, stationery, a toy, foodstuffs, a knife, a cooking utensil etc., for example. In addition, the case can be made of a single or composite material such as plastic, paper, metal, etc., and can be assembled into an external shape such as a cube, rectangle, triangle, quadrangle, polygon, round cylinder, etc. It can be configured with a shaped case.

  Also, when the case is made of a plastic sheet, for example, biodegradable plastic, vinyl chloride (PVC), polypropylene (PP), polyethylene (PE), amorphous polyethylene terephthalate (A-PET), etc., transparent, translucent, opaque A formed plastic sheet or a plastic sheet on which desired display contents are printed can be used.

  According to the present invention, the lid portion continuously provided on the rear side wall portion of the case is bent inward so that the front end of the lid portion is brought close to or in contact with the upper end of the front side wall portion and is continuously provided on the lid portion. The inserted insertion flap is inserted between the front side wall portion and each folding flap and sealed.

  Thereby, the insertion flap of a cover part is closely_contact | adhered planarly along the inner wall face of a front side wall part, and favorable sealing performance is obtained. Further, since the insertion flap of the lid is pressed against the inner wall surface of the front side wall, there is no gap between the front side wall and the insertion flap, and the contact resistance necessary to prevent opening is obtained. In addition, the anti-opening property is improved.

  In addition, since it is a sealing structure that only inserts the insertion flap of the lid, for example, it is sealed with a sealing member such as an adhesive tape, film, stopper, etc., or it is sealed with a complicated sealing structure, or heat welding It is not necessary to seal with an apparatus, and the operation of sealing the case can be performed easily and easily, and the operation of mechanical assembly by an automatic case assembly machine can be handled.

  1 to 9, the case sealing structure of the present invention is connected to the left end of the rear side wall portion 1A with reference to the rear side wall portion 1A of the plastic sheet AX obtained by developing the cubic case A. The joined portion 1Da of the left side wall portion 1D is overlapped with the front side wall portion 1F of the right side wall portion 1E connected to the right end of the rear side wall portion 1A, and is bonded and fixed with an adhesive 3 to form a rectangular tube shape. assemble. Folding flaps 1Db and 1Db connected to the upper and lower ends of the left side wall 1D and folding flaps 1Eb and 1Eb connected to the upper and lower ends of the right side wall 1E are folded inward and overlapped alternately. The contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb are in contact with the left and right upper ends and the left and right lower ends of the front side wall portion 1F.

  The upper lid portion 1B connected to the upper end of the rear side wall portion 1A and the bottom lid portion 1C connected to the lower end are folded inward and overlapped with the folded flaps 1Db and 1Eb. The insertion flap 1Ba connected to the tip of the upper lid portion 1B is inserted from above between the front side wall portion 1F and the folding flaps 1Db and 1Eb. The insertion flap 1Ca connected to the tip of the bottom lid 1C is inserted from above between the front side wall 1F and the folding flaps 1Db and 1Eb. The left and right end portions of the insertion flaps 1Ba and 1Ca are locked to the back surfaces of the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb that are in contact with the left and right upper ends and left and right lower ends of the front side wall portion 1F. Thus, the upper surface side opening Aa and the lower surface side opening Ab of the case A are sealed.

  As a fixing method instead of the adhesive 3, for example, the joining portion 1Da of the left side wall portion 1D and the free end side front side wall portion of the front side wall portion 1F are adhesively fixed with an adhesive tape, or a heat welding apparatus, ultrasonic welding. You may weld and fix with an apparatus.

  As shown in FIG. 2, the case A has a size obtained by developing a transparent or translucent plastic sheet AX formed to a thickness of about 0.3 mm and a cubic case A as shown in FIG. Die-cut into a shape and shape. At the time of die cutting, the upper and lower ends of the rear side wall 1A formed in a square shape when viewed from the front and the upper lid 1B and the bottom lid 1C connected to the upper and lower ends of the rear side wall 1A are bent. A bent ruled line 2 is formed in the portion. Bending ruled lines 2 are formed at the bent portions of the left and right ends of the rear side wall portion 1A and the left and right side wall portions 1D and 1E connected to the left and right ends of the rear side wall portion 1A.

  Further, a folding ruled line 2 is formed at a bent portion between the tip of the upper lid 1B and the insertion flap 1Ba provided continuously to the tip of the upper lid 1B, and the tip of the bottom lid 1C and the bottom lid 1C A folding ruled line 2 is formed at a bent portion with the insertion flap 1Ca provided continuously at the tip of the sheet.

  Further, a folding ruled line 2 is formed at a bent portion between the left end of the left wall portion 1D and the joint portion 1Da connected to the left end of the left wall portion 1D, and the right end of the right wall portion 1E and the right wall A bent ruled line 2 is formed at a bent portion with the front side wall portion 1F provided continuously with the right end of the portion 1E.

  Further, a folding ruled line 2 is formed at a bent portion between the upper end and the lower end of the left wall portion 1D and the folding flaps 1Db and 1Db connected to the upper end and the lower end of the left wall portion 1D. A fold ruled line 2 is formed at a bent portion between the upper end and the lower end and folding flaps 1Eb, 1Eb connected to the upper end and the lower end of the right side wall portion 1E.

  The upper lid portion 1B and the bottom lid portion 1C are formed in such a size and shape that the upper surface side opening Aa and the lower surface side opening Ab of the case A assembled in a cubic shape are closed, but the opening Aa. , Ab may be formed in such a size and shape that approximately half of Ab is closed.

  Moreover, the front-end | tip of the upper cover part 1B is formed in parallel along the upper end of the front side wall part 1F of case A assembled in the shape of a square tube. The front end of the bottom lid 1C is formed in parallel along the upper end of the front side wall 1F of the case A assembled in a rectangular tube shape.

  Further, on both sides of the insertion flaps 1Ba and 1Ca, cutout portions 1Bb and 1Cb wider than the thickness formed by overlapping the left and right folding flaps 1Db and 1Eb are formed symmetrically. The notches 1Bb and 1Cb are formed in parallel from the closed side of the central part toward the open side of both side parts along the tips of the upper lid part 1B and the bottom lid part 1C, and are identical in the length direction. A notch width w4 is formed.

  Further, the notch width w4 of the notches 1Bb and 1Cb is formed wider than the thickness obtained by overlapping the folding flaps 1Db and 1Eb. In addition, the contact portions 1Dc and 1Ec, which will be described later, are formed to have a width that protrudes forward, but may be formed to have the same width as the thickness of the folded flaps 1Db and 1Eb.

  Further, the lateral width w1 of the insertion flaps 1Ba and 1Ca is formed to be narrower than the lateral width w2 in the case A into which the insertion flaps 1Ba and 1Ca are inserted, but may be formed to have the same width as the lateral width w2 in the case A. Good.

  Further, an abutting portion 1Dc that abuts against the upper left end of the front side wall portion 1F of the case A assembled in a rectangular tube shape is formed at the front end of the folding flap 1Db that is close to the bent portion. Further, an abutting portion 1Ec that abuts against the upper right end of the front side wall portion 1F of the case A assembled in a rectangular tube shape is formed at the front end of the folding flap 1Eb that is close to the bent portion.

  The protrusion dimension w3 of the contact portions 1Dc and 1Ec is formed to have a dimension corresponding to the thickness (0.3 mm) of the plastic sheet AX constituting the case A, with the inner wall surface of the front side wall portion 1F of the case A as a reference. Yes. In addition, you may form the protrusion dimension w3 of contact part 1Dc, 1Ec to the dimension (for example, dimensions, such as 0.2 mm and 0.25 mm) below the thickness of the plastic sheet AX.

  That is, the upper and lower folded flaps 1Db, 1Db provided continuously to the left side wall 1D of the case A and the upper and lower folded flaps 1Eb, 1Eb provided continuously to the right side wall 1E are folded inward and overlapped alternately. When combined, as shown in the enlarged view of the part a in FIG. 7 and FIG. 8, the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb are brought into contact with the left and right upper ends and the left and right lower ends of the front side wall portion 1F. Accordingly, the folding flaps 1Db and 1Eb are regulated at positions where they are in contact with the upper end and the lower end of the front side wall portion 1F, and can be prevented from being pushed into the case A.

  In addition, although the bent ruled line 2 is formed in a V shape when viewed from the longitudinal direction by a ruled line blade (not shown), a plurality of bent ruled lines 2 may be formed in parallel along the bent part of each part. Alternatively, the plastic sheet AX may be formed after being punched into the size and shape shown in FIG.

  The illustrated embodiment is configured as described above, and the sealing structure of the case A assembled in a cubic shape will be described below.

  First, the left side wall 1D and the right side wall 1E are bent inward in the direction of the arrow shown in FIG. 3 with reference to the rear side wall 1A of the plastic sheet AX developed as shown in FIG. The joint portion 1Da provided continuously with 1D is overlapped with the front end (or rear surface) of the front end portion 1F provided continuously with the right side wall portion 1E. Further, the joining portion 1Da of the left side wall portion 1D and the front end side front surface of the front side wall portion 1F are bonded and fixed with an adhesive 3 and assembled into a rectangular tube shape (see FIG. 3).

  Further, the upper and lower folded flaps 1Db and 1Db provided continuously with the left side wall 1D and the upper and lower folded flaps 1Eb and 1Eb provided continuously with the right side wall 1E are folded inward in the direction of the arrow shown in FIG. Bend and stack up and down alternately. Further, the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb are contacted with the left and right upper ends and the left and right lower ends of the front side wall portion 1F (see FIGS. 4, 5, and 6).

  The upper lid portion 1B and the bottom lid portion 1C are folded inward in the direction of the arrow shown in FIG. 6, and the upper lid portion 1B is overlaid on the folding flaps 1Db and 1Eb folded so as to face the opening Aa of the case A. Match. Further, the bottom lid 1C is overlapped with the folded flaps 1Db and 1Eb bent so as to face the opening Ab of the case A. As a result, the tip of the top lid 1B is brought close to or in contact with the upper end of the front side wall 1F, and the tip of the bottom lid 1C is brought close to or in contact with the lower end of the front side wall 1F.

  The insertion flap 1Ba of the upper lid 1B is inserted from above between the upper end of the front side wall 1F and the front ends of the upper folding flaps 1Db, 1Eb, and the left and right ends of the insertion flap 1Ba are brought into contact with the left and right upper ends of the front side wall 1F. It engages with the back surface of the contact portions 1Dc and 1Ec of the folded flaps 1Db and 1Eb in contact with each other (see FIG. 7).

  Further, the insertion flap 1Ca of the bottom lid 1C is inserted from below between the lower end of the front side wall 1F and the front ends of the lower folding flaps 1Db and 1Eb, and the left and right ends of the insertion flap 1Ca are connected to the front side wall 1F. The folding flaps 1Db and 1Eb that are in contact with the left and right lower ends are engaged with the back surfaces of the contact portions 1Dc and 1Ec. Accordingly, the insertion flaps 1Ba and 1Ca are prevented from being pulled out, and the openings Aa and Ab of the case A can be closed with the upper lid portion 1B and the bottom lid portion 1C.

  When opening the openings Aa and Ab of the case A, the insertion flap 1Ba of the upper lid 1B and the insertion flap 1Ca of the bottom lid 1C are deformed inward so that the left and right ends of the insertion flaps 1Ba and 1Ca are moved forward. Since the insertion flaps 1Ba and 1Ca cannot be pulled out unless they are separated from the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb that are in contact with the left and right upper ends and the left and right lower ends of the side wall portion 1F, the upper lid portion 1B and the bottom lid are not allowed to be pulled out. The closed state by the part 1C can be maintained.

  As described above, the upper lid portion 1B and the bottom lid portion 1C connected to the rear side wall portion 1A of the case A are bent inward, and the top ends of the upper lid portion 1B and the bottom lid portion 1C are connected to the upper and lower ends of the front side wall portion 1F. Along or touching. Further, the insertion flaps 1Ba and 1Ca of the upper lid portion 1B and the bottom lid portion 1C are inserted between the front side wall portion 1F and the folding flaps 1Db and 1Eb to prevent it from being removed. Thereby, insertion flap 1Ba, 1Ca is closely_contact | adhered planarly along the inner wall face of the front side wall part 1F, and favorable sealing performance is obtained. Further, since the insertion flaps 1Ba and 1Ca are pressed against the inner wall surface of the front side wall portion 1F, there is no gap between the front side wall portion 1F and the insertion flaps 1Ba and 1Ca, which is necessary for preventing the opening. Contact resistance is improved, and the anti-opening property is improved.

  In addition, since the sealing structure is such that the insertion flaps 1Ba and 1Ca of the upper lid portion 1B and the bottom lid portion 1C are inserted, sealing is performed with a sealing member such as an adhesive tape, a film, a stopper, or a complicated sealing. It is not necessary to seal with a structure or with a heat welding device, and the operation of sealing the case A can be performed easily and easily, and the operation of mechanical assembly by an automatic case assembly machine can be handled.

  Further, as shown in FIG. 9, when the weight of the object accommodated in the case A is added to the bottom lid 1C, the insertion flap 1Ca of the bottom lid 1C is directed outward due to the added stress. And is pressed flatly along the inner wall surface of the front side wall portion 1F. Thereby, a gap does not occur between the inner wall surface of the front side wall portion 1F and the insertion flap 1Ca of the bottom lid portion 1C, and the insertion flap 1Ca of the bottom lid portion 1C is difficult to come off.

  Even when a heavy object to be stored is accommodated in the case A, the bottom cover 1C is not opened unexpectedly, and the object can be prevented from falling off. In addition, although it varies somewhat depending on the size, shape, thickness, etc. of the case A, the weight is about 1.5 to 3 times that of a general retaining structure in which only the insertion flap 1Ca of the bottom lid 1C is inserted. Can withstand structural strength and structural strength is improved.

  Further, the folding flaps 1Db and 1Eb of the left side wall portion 1D and the right side wall portion 1E are folded inward and overlapped vertically so that the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb are placed on the left and right upper ends of the front side wall portion 1F. Abuts the left and right lower ends.

Thereafter, the upper lid portion 1B and the bottom lid portion 1C are overlapped with the folding flaps 1Db and 1Eb of the right side wall portion 1E and the left side wall portion 1D, and the insertion flaps 1Ba and 1Ca are overlapped with the front side wall portion 1F and the upper folding flaps 1Db and 1Eb. The left and right end portions of the insertion flaps 1Ba and 1Ca are engaged with the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb that are in contact with the left and right upper ends and the left and lower ends of the front side wall portion 1F. As a result, even if the case A assembled in a rectangular tube shape is stacked up and down or the objects to be stored are stacked on the case A, the upper lid portion 1B and the bottom lid portion 1C are not easily deformed inward, and the cubic shape As a result, the structural strength is improved.

  Further, if the sealing structure of the present invention is adopted, the strength necessary for maintaining the accommodation state of the object to be stored can be obtained even if the thickness of the plastic sheet AX constituting the case A is reduced. The thickness of the plastic sheet AX is reduced from about 0.3 mm to about 0.25 mm, or the thickness is reduced from about 0.25 mm to about 0.2 mm to reduce the weight of the case A and reduce the material cost. Can do.

  10 and 11 show another example of the sealing structure in which the insertion flaps 1Ba and 1Ca of the cubic case A are formed wider than the upper lid portion 1B and the bottom lid portion 1C. The lateral width w1 of the insertion flaps 1Ba and 1Ca is formed wider than the lateral width w2 in the case A into which the insertion flaps 1Ba and 1Ca are inserted.

  That is, the left and right end portions of the insertion flaps 1Ba and 1Ca are projected evenly on the left and right sides toward the outside from both side edge portions of the upper lid portion 1B and the bottom lid portion 1C. Further, the protrusion dimensions w5 at the left and right ends of the insertion flaps 1Ba and 1Ca are formed to be about 0.5 mm. Depending on the size of the case A, the protrusion dimension w5 of the insertion flaps 1Ba, 1Ca may be changed to a protrusion dimension of 0.5 mm or less or 0.5 mm or more.

  When the insertion flap 1Ba of the upper lid portion 1B is inserted between the front side wall portion 1F and the folding flaps 1Db, 1Eb, the left and right end portions of the insertion flap 1Ba touch the inner wall surfaces of the left side wall portion 1D and the right side wall portion 1E. Be touched. The left and right ends of the insertion flap 1Ba are bent inward by the reaction force generated at the contact portion.

  Since the left and right end portions of the curved insertion flap 1Ba are locked inside the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb, they are less likely to come out than being locked to the contact portions 1Dc and 1Ec. Sealing can be performed more reliably and firmly than the sealing structure, and the anti-opening property is improved. Further, the insertion flap 1Ca of the bottom lid portion 1C can be sealed in the same manner as the insertion flap 1Ba of the upper lid portion 1B.

  Further, the left side wall 1D and the right side wall 1E are pushed outward by the restoring force of the insertion flap 1Ba, and the front side wall 1F is pulled in the width direction by the left side wall 1D and the right side wall 1E. Thereby, since the front side wall part 1F is straightly tensioned in a straight line state, a gap is not formed between the front side wall part 1F and the insertion flap 1Ba, and the sealing performance is greatly improved.

  One of the insertion flaps 1Ba and 1Ca may be formed wide. Further, the lateral width w1 of the insertion flaps 1Ba and 1Ca is preferably formed to a size within a range of 0.01% to 0.1% with respect to the lateral width w2 of the case A.

  12 and 13 are other examples of the sealing structure used when the vertically long case A is mechanically assembled. The angle at which the front end of the folding flap 1Db of the left side wall 1D corresponding to the front side wall 1F of the case A and the front end of the folding flap 1Eb of the right side wall 1E are inclined rearward from the base end toward the free end. Is formed. Further, an adhesive 3 for bonding the joint 1Fa and the right side wall 1E is applied to the joint 1Fa provided continuously to the left end of the front side wall 1F.

  That is, when the folding flaps 1Db, 1Db of the left side wall portion 1D and the folding flaps 1Eb, 1Eb of the right side wall portion 1E are folded inward and overlapped alternately vertically, the front side wall portion 1F and the folding flaps 1Db, 1Eb A large space is formed between which the insertion flaps 1Ba and 1Ca of the upper lid portion 1B and the bottom lid portion 1C are allowed to be inserted (see FIG. 13).

  As a result, the insertion flap 1Ba of the upper lid portion 1B and the insertion flap 1Ca of the bottom lid portion 1C are machined by an automatic case assembling machine (not shown) in the space between the front side wall portion 1F and the folding flaps 1Db and 1Eb. The case A can be mechanically assembled and sealed.

  FIG. 14 shows another example of the sealing structure in which the insertion flaps 1Ba and 1Ca of the case A shown in FIG. 12 are formed wider than the lateral width w2 in the case A into which the insertion flaps 1Ba and 1Ca are inserted. When the insertion flap 1Ba of the upper lid portion 1B and the insertion flap 1Ca of the bottom lid portion 1C are inserted between the front side wall portion 1F and the folding flaps 1Db, 1Eb, the left and right ends of the insertion flaps 1Ba, 1Ca are inward. Curved towards. Since the left and right end portions of the curved insertion flap 1Ba are locked inside the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb, the same operations and effects as in the above embodiment can be achieved.

FIG. 15 shows another example of a sealing structure in which the upper lid portion 1B of the cubic case A is torn along the folding ruled line 2 and opened. The bottom of the bent ruled line 2 having a V shape formed at the bent part of the insertion flap 1Ba and the upper lid 1B is allowed to tear along the bottom of the bent ruled line 2 in the length direction. A thin portion 2a having a small thickness is partially formed.

That is, when opening the upper lid portion 1B, even if there is no gap for inserting a fingernail or the like between the front side wall portion 1F and the upper lid portion 1B, the bent portion between the insertion flap 1Ba and the upper lid portion 1B is removed. If it tears along the thin part 2a of the bending ruled line 2, the insertion flap 1Ba is separated from the upper lid part 1B. Thereby, since the sealing by the insertion flap 1Ba is released, the labor and work of deforming the upper lid portion 1B and the insertion flap 1Ca can be omitted, and the operation of opening the upper lid portion 1B can be performed easily and easily. Moreover, since it is impossible to reseal once opened, it can be confirmed reliably whether it has been opened. In addition, as a structure replacing the thin portion 2a, for example, a penetrating portion penetrating in the thickness direction along the bottom of the bent ruled line 2 may be partially formed.

Further, as shown in FIG. 16, a tearing portion 2b penetrating in the thickness direction along the folding ruled line 2 is formed in the folding ruled line 2 formed in the folded portion of the insertion flap 1Ba and the upper lid portion 1B. May be. That is, when opening the upper lid portion 1B, if the tear portion 2b formed in the bent portion between the insertion flap 1Ba and the upper lid portion 1B is expanded with a finger or a nail or the like and is torn in the length direction, the upper lid portion 1B The insertion flap 1Ba is separated.

Thereby, since sealing by insertion flap 1Ba is cancelled | released, there can exist an effect | action and effect substantially equivalent to the structure shown in FIG. In addition, the said structure is applicable also to the bending part of insertion flap 1Ca and the bottom cover part 1C. Moreover, it is applicable also to the rectangular case A.

  FIG. 17 shows another example in which the cutout portions 1Bc and 1Bc are formed at the upper left and right corners of the upper lid portion 1B corresponding to the cutout portions 1Bb and 1Bb of the insertion flap 1Ba. A notch width w6 in which the notch portions 1Bb and 1Bb of the insertion flap 1Ba are combined with the notch portions 1Bc and 1Bc at the upper left and right corners of the upper lid portion 1B is formed wider than the notch width w4 shown in FIG. Has been. Further, the notch width w6 formed by the notch portions 1Bb and 1Bc is formed so as to gradually increase from the closing side to the opening side, and therefore can be easily punched with a Thomson blade or the like. .

In addition, the mold used for the die cutting operation can be easily manufactured, and the manufacturing cost can be reduced. In addition, there is no influence on the sealing performance and the opening prevention performance, and it is possible to achieve substantially the same operations and effects as in the above embodiment. Each notch 1Cb of insertion flap 1Ca, 1Cb the corresponding bottom lid portion 1C of the lower side left and right angle each cutout portion as shown in FIG. 17 in section 1Bb, it may be formed 1Bc.

  FIG. 18 shows that the center of the front end of the upper lid portion 1B is formed in an arc shape that protrudes forward along the upper end of the front side wall portion 1F of the case A assembled in a rectangular tube shape. It is the other example which formed the bending ruled line 2 along. Further, the deformation width w7 of the bent portion having the arc shape is formed to be about 0.3 mm with respect to a line connecting the left and right ends of the upper lid portion 1B, but is about 0.3 mm or less or about 0.3 mm or more. You may form in the deformation amount.

  That is, the insertion flap 1Ba of the upper lid portion 1B is folded inward and inserted between the upper end of the front side wall portion 1F of the case A assembled in a rectangular tube shape and the front ends of the upper folding flaps 1Db and 1Eb. As a result, the insertion flap 1Ba is curved in an arc shape along the tip of the upper lid portion 1B and is in close contact with the inner wall surface of the front side wall portion 1F in a curved surface, so that the front side wall portion 1F protrudes forward. Even if it is curved into a shape, a good sealing property can be obtained. In addition, you may form the front-end | tip of 1 C of bottom cover parts in an arc shape as shown in FIG. Further, as another example other than the arc shape, for example, it may be formed in a shape protruding forward such as a trapezoidal shape or a square shape.

  19 and 20 show the contact of the folding flaps 1Db and 1Eb connected to the left side wall 1D and the right side wall 1E when the insertion flap 1Ba of the upper lid 1B and the insertion flap 1Ca of the bottom lid 1C are inserted. This is another example of the sealing structure in which the portions 1Dc and 1Ec are deformed inward.

  The contact portions 1Dc and 1Ec formed at the rear ends of the upper folding flaps 1Db and 1Eb are formed so as to be in contact with the left and right upper ends (both sides of a standing flap 1G described later) of the rear side wall portion 1A. Further, the contact portions 1Dc and 1Ec formed at the front ends of the lower folding flaps 1Db and 1Eb are formed to contact the left and right lower ends of the front side wall portion 1F.

  Further, the contact portions 1Dc and 1Ec are formed to be narrower than the contact portion 1Dc shown in the enlarged view of the portion a in FIG. 5, and a predetermined distance (plastic sheet) from the folding ruled line 2 of the folded portions of the folding flaps 1Db and 1Eb. It is formed at positions separated by an interval of 5 to 30 times the wall thickness of AX. Thus, when inserting the insertion flaps 1Ba and 1Ca, the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb that are in contact with the left and right upper ends of the rear side wall portion 1A and the left and right lower ends of the front side wall portion 1F are directed inward. It becomes easy to deform. Note that the contact portions 1Dc and 1Ec shown in FIG. 5 may be cut to the dimensions shown in FIG.

  That is, as shown in FIG. 21 and the enlarged view of the portion b, the insertion flap 1Ca of the bottom lid portion 1C is inserted when inserted between the front side wall portion 1F assembled into a rectangular tube shape and the folding flaps 1Db and 1Eb. The contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb that are in contact with the left and right lower ends of the front side wall portion 1F are deformed inward by the flap 1Ca.

  Further, the left and right end portions of the insertion flap 1Ca are curved in an arc toward the inside with the contact portions 1Dc and 1Ec as fulcrums while being in contact with the inner wall surfaces of the left side wall portion 1D and the right side wall portion 1E. Further, it is inserted inward along a gap S formed between the end surface of the folding ruled line 2 of the contact portions 1Dc and 1Ec and the inner wall surfaces of the left and right wall portions 1D and 1E.

  Next, as shown in FIG. 22, when the insertion flap 1Ca of the bottom lid portion 1C is inserted inward from the lower end of the front side wall portion 1F, the contact portions 1Dc, 1Ec of the folding flaps 1Db, 1Eb are the front side wall portions. It returns to the state of being in contact with the left and right lower ends of 1F. Further, the left and right end portions of the insertion flap 1Ca are locked to the back surfaces of the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb that are in contact with the left and right lower ends of the front side wall portion 1F. As a result, the insertion flap 1Ca is prevented from being pulled out, and operations and effects substantially equivalent to those of the above embodiment can be achieved.

  On the other hand, the insertion flap 1Ba of the upper lid portion 1B is on the back surface of the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb that are in contact with the left and right upper ends of the rear side wall portion 1A, like the insertion flap 1Ca of the bottom lid portion 1C. Locked. Accordingly, the insertion flaps 1Ba and 1Ca of the upper lid portion 1B and the bottom lid portion 1C can be mechanically bent and inserted, and the assembling work by the automatic case assembling machine can be performed easily and easily.

  The size of the portion X shown in the enlarged view of the portion c in FIG. 22 is desirably formed to a size that is included in the range of 30% to 300% of the thickness of the plastic sheet AX. Further, it is desirable that the dimension of the Y part is formed so as to be included in a range of 5 to 30 times the wall thickness. When the dimensions of the X part and the Y part are widened, the gap becomes large and the sealing performance is lowered. Further, since the insertion flaps 1Ba and 1Ca of the upper lid portion 1B and the bottom lid portion 1C are easily detached, it is preferable to form the dimensions within the above range.

  Further, the deformation width w7 of the bent portions of the insertion flaps 1Ba and 1Ca of the upper lid portion 1B and the bottom lid portion 1C is formed to be about 0.7 mm with reference to a line connecting the left and right ends of the upper lid portion 1B and the bottom lid portion 1C. However, it may be formed in a deformation amount of about 0.7 mm or less or about 0.7 mm or more.

  Note that, in a portion different from the plastic sheet AX of the above-described embodiment, an upper lid portion 1B is continuously provided at the upper end of the front side wall portion 1F. A standing flap 1G is connected to the upper end of the rear side wall 1A. Further, the notch width w4 of the notches 1Bb and 1Cb is wider than the thickness of one of the folded flaps 1Db and 1Eb (thickness of the plastic sheet AX), and is greater than the thickness obtained by overlapping the folded flaps 1Db and 1Eb. You may form narrowly.

In the correspondence between the configuration of the present invention and the embodiment,
The lid portion of the present invention corresponds to the upper lid portion 1B and the bottom lid portion 1C of the embodiment,
Similarly,
Both side walls correspond to the left side wall 1D and the right side wall 1E,
The present invention is not limited to the configuration of the above-described embodiment, but can be applied based on the technical idea shown in the claims, and many embodiments can be obtained.

  In the case sealing structure of the present invention, the insertion flaps 1Ba and 1Ca can be connected to the front side wall even if the contact portions 1Dc and 1Ec of the folding flaps 1Db and 1Eb are not in contact with the end surface of the front side wall portion 1F or the rear side wall portion 1A. Contact resistance necessary for preventing the opening is obtained by being in close contact with the inner wall surface of the portion 1F or the rear side wall portion 1A. Thereby, there is no support in sealing performance and anti-opening property as a case sealing structure, and the same operation and effect as the above embodiment can be achieved.

The perspective view which shows the assembly state of a cube-shaped case. The top view which shows the expansion | deployment state of the case of FIG. The perspective view which shows the state which assembled the case of FIG. 2 in the shape of a square cylinder. The perspective view which shows the state which bent one folding flap inside. The top view which shows the state which bent each folding flap on either side inside. The perspective view which shows the state which bent each right and left folding flap inside. The cross-sectional bottom view which shows the latching state of each folding flap of FIG. The expanded vertical side view which shows the latching state of the insertion flap of an upper cover part. The expanded vertical side view which shows the latching state of the insertion flap of a bottom cover part. The top view which shows the state which formed the insertion flap of FIG. 2 wide. FIG. 11 is a cross-sectional bottom view showing a locked state of the insertion flap of FIG. The top view which shows the expansion | deployment state of the case assembled in a vertically long shape. The top view which shows the state which bent each folding flap of FIG. 12 inside. The top view which shows the example which formed the insertion flap of FIG. 12 wide. The perspective view which shows the structure which tears and opens the upper cover part of a case. The perspective view which shows the other structure which tears and opens the upper cover part of a case. The enlarged view which shows the example which formed each notch part of the insertion flap widely. The top view which shows the example formed in the shape which protrudes the front-end | tip of a cover part ahead. The top view which shows the other structure which formed the contact part of the folding flap narrowly. The enlarged plan view which shows the folding flap of a bottom cover part and a left side wall part. The bottom view and b section enlarged view which show the deformation | transformation state of the contact part of a folding flap. The bottom view and c section enlarged view which show the latching state of an insertion flap.

AX ... Plastic sheet A ... Case Aa, Ab ... Opening 1A ... Rear side wall 1B ... Upper lid 1C ... Bottom lid 1D ... Left side wall 1E ... Right side wall 1F ... Front side wall 1G ... Standing flap 1Ba, 1Ca ... Insertion flaps 1Bb, 1Bc, 1Cb ... Notch 1Da ... Joining part 1Db, 1Eb ... Folding flap 1Dc, 1Ec ... Abutting part 2 ... Bending ruled line 2a ... Thin wall part 2b ... Tear part 3 ... Adhesive

Claims (10)

After folding the left and right folding flaps connected to the upper and lower ends of both side walls of the case assembled in a square tube shape and folding them up and down, they were connected to the upper and lower ends of the rear side wall. Case sealing that folds the upper and lower lids inward and overlaps each folding flap, and inserts the insertion flap connected to the tip of each lid between the front side wall and each folding flap. Structure,
Forming the tip of each lid along the upper and lower ends of the front side wall,
When the folding flaps are folded inward, the end portions of the respective folding flaps that are on the side corresponding to the insertion flaps are brought into contact with the end portions of the front side wall portion on the side where the insertion flaps are inserted. A contact portion is formed,
The insertion flap is wider than the thickness of one of the folding flaps or the thickness of one of the folding flaps overlapped on both sides of the insertion flap along the front end of the lid portion. A case sealing structure in which a notch portion is formed in which engagement of the contact portion is allowed when inserted between each folding flap . The case sealing structure according to claim 1, wherein the front ends of the lid portions are formed in parallel along an upper end and a lower end of the front side wall portion. The case sealing structure according to claim 1, wherein a tip of each lid is formed in a shape protruding forward along an upper end and a lower end of the front side wall. The contact portion,
Each of the folding flaps connected to the upper and lower ends of the both side wall portions is formed at the end portion on the side corresponding to the insertion flap, and the front side wall portion with respect to the upper and lower ends on the side where the insertion flap is inserted. The case sealing structure according to any one of claims 1 to 3, wherein the case sealing structure is formed in a size to be contacted . The case sealing structure according to any one of claims 1 to 4, wherein the protruding dimension of the contact portion is formed to a dimension corresponding to a thickness of a sheet constituting the case. The case sealing structure according to any one of claims 1 to 5, wherein a lateral width of the insertion flap is formed narrower than a lateral width in the case into which the insertion flap is inserted. The case sealing structure according to any one of claims 1 to 6, wherein a width of the insertion flap is formed wider than a width of the case in which the insertion flap is inserted. A thin-walled portion having a thin wall thickness that allows tearing in the length direction along the folding ruled line is formed at the bottom of the folding ruled line formed at the bent part of the insertion flap and the upper lid part. The case sealing structure according to any one of Items 1 to 6. The tearing part penetrated in the thickness direction along this folding ruled line in the folding ruled line formed in the folding part of the insertion flap and upper lid part was formed according to any one of claims 1-8. Case sealing structure. Wherein those of the contact portion, the folding case sealing structure according to claim 1 or 4 was formed from bent portion spaced positions a predetermined distance of the flap.

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