JP4488874B2 - Plastic box - Google Patents

Description

  The present invention relates to a plastic box, and in particular, a pair of inner flaps connected to a quadrangular opening is folded inward, an outer flap is folded, and an insertion flap piece is inserted into the opening to be locked. Thus, the present invention relates to a plastic box that closes the opening.

  For example, instead of conventional paper boxes made of cardboard, cardboard, etc., plastic plastic boxes are often used as packaging boxes for packaging cosmetics, medicines, confectionery, stationery, and other daily necessities. ing. A plastic box is a packaging box that allows the internal contents and decorations to be visually recognized from the outside as a transparent or transparent container. For example, a plastic sheet cut into a predetermined shape is bent along a folding line. Alternatively, it is preferably formed by being easily assembled into a hexahedral shape by joining at appropriate locations.

  Also, when assembling a plastic box into a hexahedron shape, for example, after assembling a tubular body having a square cross section with upper and lower ends opened by side walls surrounding the four sides, the bottom and top surfaces are It is formed by bending an inner flap and an outer flap provided continuously with the upper edge and the lower edge and closing the quadrangular opening. In other words, an insertion flap piece is provided, in which inner flaps connected to one opposing two sides of the periphery of the quadrangular opening are bent inward, and connected to one of the other two opposing sides. The outer flap is folded outside the folded inner flap, and the insertion flap piece is inserted and locked inside the opening between the other side of the other two opposite sides and the folded inner flap. Thus, the opening is closed to form the bottom surface and the top surface.

  On the other hand, when a plastic box is assembled into a hexahedron shape, the plastic has elasticity, so each side of the box body assembled into a three-dimensional shape by folding along the fold line is compared with a paper box. And tend to bend. For this reason, in the plastic box, even if the insertion flap piece is simply inserted inside the opening portion to form the bottom surface portion or the top surface portion, the resilience of the outer flap is increased due to the elasticity of the plastic, for example, and the insertion flap piece becomes the opening portion. Since it becomes easy to come out from the inside, for example, in order to prevent such insertion flap piece from coming out, a notch for locking is formed at both ends of the fold line from the outer flap of the insertion flap piece. The notch is provided with a locking mechanism by locking the proximal end portion of the inner flap.

In addition, the plastic box assembled into a hexahedron shape needs to open and close the upper surface of the plastic box, and it is necessary to put in and out the contents. Therefore, a lock mechanism has been developed to make it easier to open the plastic box. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 6-42632

  The lock mechanism of Patent Document 1 is provided with protrusions protruding inwardly for locking the side edges of the inner flap piece in the vicinity of the fold line from the outer flap at both end portions of the insertion flap piece. When the insertion flap piece is inserted inside the quadrangular opening to close the opening, the side edge of the inner flap piece bent in advance is moved over the protrusion by the bending of the protrusion. Is to be locked. However, in the lock mechanism disclosed in Patent Document 1, it is easy to open the plastic box, but it is difficult to form the protrusion with a high height, so that the locking force is inferior. In some cases, the plastic box that tends to be bent cannot be stably locked with the opening closed.

  According to the present invention, the quadrangular opening can be closed in a reliable and stable locked state by a pair of inner flaps and an outer flap provided with an insertion flap piece, and the locked state can be opened smoothly so that the contents of the container can be opened. An object of the present invention is to provide a plastic box that can be easily put in and out.

  The present invention is made of plastic and bends inward the inner flaps that are connected to one opposite two sides of the periphery of the quadrangular opening, and are connected to one of the other two opposite sides. The outer flap including the insertion flap piece is folded, and the insertion flap piece is inserted into the opening between the other side of the other two opposite sides and the bent inner flap. A plastic box that closes the opening by stopping, and the proximal end portion of the inner flap is locked to the notches formed at both ends of the fold line from the outer flap of the insertion flap piece. And a wing-like portion separated from the outer flap by the fold line by the notch is externally provided at both end portions of the insertion flap piece. Bent, by providing a plastic box provided to hold the state of being inclined at an angle of 20-40 degrees with respect to the insertion flap piece is obtained by achieving the above object.

  According to the plastic box of the present invention, the rectangular opening can be reliably and stably closed by the pair of inner flaps and the outer flap having the insertion flap piece, and the locked state is smoothly opened. Thus, the contents can be easily taken in and out.

  A plastic box 10 according to a first preferred embodiment of the present invention is assembled into a three-dimensional shape by bending a plastic sheet 11 cut into a predetermined shape, as shown in FIGS. Thus, it is used as a packaging box for storing cosmetics, for example, and is surrounded on four sides by a front side wall part 12a, a pair of side wall parts 12b, and a rear side wall part 12c. A rectangular opening 17 on the top surface and bottom surface of the cylindrical body having a quadrangular cross section is closed by a pair of inner flaps 13 and an outer flap 15 having insertion flap pieces 14 to be described later to form a hexahedral shape. For example, it is formed in a vertically long rectangular parallelepiped shape having a width B of 25 to 60 mm, a depth L of 20 to 60 mm, and a height H of about 80 to 180 mm.

  The plastic box 10 of the first embodiment is made of plastic, and is connected to two opposing sides (upper sides of the side wall portion 12b) 18 on one side of the periphery of the rectangular opening 17 on the upper surface portion, for example. Each of the inner flaps 13 is folded inward, and the outer flap 15 including the insertion flap piece 14 connected to one of the other two opposite sides 19 (the upper side of the rear side wall portion 12c) is folded and inserted. By opening the flap piece 14 into the opening 17 between the other side (the upper side of the front side wall portion 12a) of the two opposite sides 19 and the bent inner flap 13, the flap piece 14 is locked. This is a plastic packaging box that closes the portion 17. Further, a locking mechanism is provided by locking the base end portion 13a of the inner flap 13 to the notches 21 formed at both end portions of the fold line (insertion fold line) 20 from the outer flap 15 of the insertion flap piece 14. The wing-like portion 16 separated from the outer flap 15 by the insertion fold line 20 is bent outwardly at both end portions of the insertion flap piece 14 by the notch 21, and 20 to 40 with respect to the insertion flap piece 14. It is provided while maintaining a state inclined at an angle θ of degrees.

  Further, in the first embodiment, both end portions of the insertion flap piece 14 due to the wing-like portion 16 have a curved shape by rounding the corner portion 16a into an arc shape.

  The plastic sheet 11 for forming the plastic box 10 of the first embodiment is made of, for example, polypropylene, polyethylene terephthalate, polyvinyl chloride, polystyrene or the like as a plastic, preferably 0.3 to 0.5 mm, more preferably 0. .Thin plate material with a thickness of 35 to 0.45 mm, which can be easily bent smoothly without bending even when the side edges are gripped and horizontally extended in a cantilevered manner In addition to having a shape-retaining rigidity and elasticity that can be held together, it has a deformability that allows it to be easily bent by hand force.

  Further, as shown in FIG. 2, the plastic sheet 11 is formed, for example, by punching out a sheet material so as to have a shape in which the plastic box 10 is developed, and a folding line 25 made of, for example, a half-cut line or a ruled line, 26, a cut 21 made of all cut lines, and the like are provided at appropriate positions so that the work of assembling into a hexahedron shape can be easily performed. That is, for example, a vertically long rectangular side wall portion 12b is connected to both sides of a vertically long rectangular rear side wall portion 12c via a vertical folding line 25, and one side wall portion 12b On the side, a vertically long rectangular front side wall portion 12 a is continuously provided via a vertical folding line 25. A longitudinal strip-shaped joining piece 27 is continuously provided on the side of the front side wall portion 12 a via a longitudinal fold line 25. Further, the inner flaps 13 are connected to the upper and lower sides of the side wall portions 12b via the lateral folding lines 26, respectively, and the upper side of the rear side wall portion 12c and the lower side of the front side wall portion 12a. The outer flaps 15 including the insertion flap pieces 14 are connected to each other via the lateral folding line 26.

  Further, in the first embodiment, the distance L ′ of the insertion fold line 20 of the outer flap 15 from the lateral fold line 26 is the depth L of the plastic box 10 except for both end portions where the cuts 21 are formed. Is provided so as to bite into the rear side wall portion 12c so as to be shorter by about 1 to 2 mm than the width of the side side wall portion 12b corresponding to. As a result, when the opening 17 is closed and locked by the inner flap 13 and the outer flap 15 (see FIGS. 1A and 1B), it is separated from the outer flap 15 by the insertion fold line 20 by the notch 21. Each wing-like portion 16 at both end portions can smoothly enter below the base end portion 13a of the inner flap 13, and a sufficient locking width can be secured to obtain a stable locked state. become.

  Furthermore, in the first embodiment, the cuts 21 formed at both ends of the insertion fold line 20 are provided with a length of, for example, 3 to 5 mm, and extend obliquely toward the insertion fold line 20. It connects with the insertion bending line 20 provided in the back side wall part 12c side through the notch part. Further, the base end portion 13a of the inner flap 13 is provided as an enlarged stepped portion having a length corresponding to the length of the cut 21 and extending one step from the side edge of the inner flap 13. The portion 13 a is locked so as to be inserted into the notch 21 by the elasticity of the inner flap 13 and the insertion flap piece 14, and forms a strong and stable locking mechanism together with the notch 21.

  In the first embodiment, the both ends of the insertion flap piece 14 are preferably extended substantially perpendicularly to the insertion folding line 20 from the deepest part of the cut 21 formed in the insertion folding line 20. For example, an end fold line 28 made of a ruled line or the like is provided. When assembling the plastic box 10, the wing-like portion 16 is inclined at an angle of 20 to 40 degrees with respect to the insertion flap piece by bending both end portions of the insertion flap piece 14 through the end fold line 28. It can be held in a state.

  Here, the wing-like portion 16 needs to be held at an angle θ of 20 to 40 degrees with respect to the insertion flap piece 14 and is inclined at an angle θ of 25 to 35 degrees with respect to the insertion flap piece. It is preferable to maintain the state. When the inclination angle θ is smaller than 20 degrees, the lock becomes strong, and it becomes difficult to smoothly release the locked state. When the inclination angle θ is larger than 40 degrees, the locked state becomes unstable. In addition, by setting the inclination angle θ to 20 to 40 degrees, it is possible to smoothly release the locked state while ensuring a stable locked state. In consideration of the size of the opening 17, the size of the insertion flap piece 14, or the size and shape of the base end portion 13 a of the inner flap 13, the inclination angle θ is determined with respect to the base end portion 13 a of the inner flap 13. It can design suitably in the above-mentioned range where engagement is effectively maintained.

  In order to assemble the plastic box 10 using the plastic sheet 11 formed as described above, first, each vertical fold line 25 is bent by approximately 90 degrees, and the side edge of one side wall portion 12b is formed. A cross section 4 surrounded by four sides by a front side wall part 12a, a pair of side side wall parts 12b, and a rear side wall part 12c by joining the joining pieces 27 along an adhesive, heat fusion, or the like along A square cylindrical body is formed. Thereafter, the inner flaps 13 connected to the two opposite sides (the lower side of the side wall portion 12b) of the periphery of the rectangular opening (not shown) in the bottom surface of the cylindrical body are respectively connected to the inner side. The outer flap 15 including the insertion flap piece 14 that is connected to one of the other two opposite sides (the lower side of the front side wall portion 12a) is folded, and the insertion flap piece 14 is placed inside the opening. To close the opening. Further, by locking the proximal end portion 13a of the inner flap 13 to the notches 21 formed at both end portions of the insertion fold line 20, the closed state is locked in a strong and stable state.

  When the bottom surface portion of the plastic box 10 is closed, a container such as cosmetics is accommodated inside the opening portion 17 on the top surface portion, and the rectangular opening portion 17 on the top surface portion of the cylindrical body is accommodated in the same manner as the bottom surface portion. The inner flaps 13 connected to two opposite sides (upper side of the side wall portion 12b) 18 of each of the peripheral edges are bent inward, and the upper side of the rear side wall portion 12c which is one of the other two sides 19 is bent. The outer flap 15 provided with the insertion flap piece 14 that is provided continuously is folded on the inner flap 13, and the insertion flap piece 14 is inserted between the front side wall portion 12 a inside the opening 17 and the side edge of the inner flap 13. Then, the opening 17 is closed. Further, the base end portion 13a of the inner flap 13 is locked to the notches 21 formed at both end portions of the insertion folding line 20, and the inclined wing-like portions 16 at both end portions of the insertion flap piece 14 are connected to the inner flap 13 as shown in FIG. The base end portion 13a is inserted under the base end portion 13a, a sufficient locking width is secured, and the closed state is locked in a strong and stable state.

  And according to the plastic box 10 of this 1st Embodiment, as above-mentioned, it opens by latching the base end part 13a of the inner flap 13 to the notch 21 formed in the both ends of the insertion folding line 20 The closed state of the portion can be locked in a strong and stable state, and the locked state of the opening portion 17 of the closed upper surface portion can be smoothly opened to easily put in and out the contents. . That is, according to the first embodiment, the wing-like portion 16 separated from the outer flap 15 by the insertion fold line 20 by the notch 21 is bent outward at the both end portions of the insertion flap piece 14 and inclined. As shown in FIG. 3, the engagement margin of the inner flap 13 to the proximal end portion 13a at the both end portions of the insertion flap piece 14 is reduced as shown in FIG. The opening 17 on the upper surface portion can be easily opened and the contents can be taken in and out without requiring a large force and avoiding the breakage or loss of the cuts 21 provided at both ends of the insertion fold line 20. It becomes possible to do.

  Further, according to the plastic box 10 of the first embodiment, both end portions of the insertion flap piece 14 due to the wing-like portion 16 have a curved shape because the corner portion 16a on the tip end side is rounded in an arc shape. The insertion flap piece 14, which is a wing-like portion 16 with both end portions bent outward, is inserted into the opening 17 between the upper side 19 of the front side wall portion 12 a and the bent inner flap 13. The operation can be performed smoothly.

  4 (a) and 4 (b) show a plastic box 30 according to a preferred second embodiment of the present invention. In the plastic box 30 of the second embodiment, in addition to having substantially the same configuration as the plastic box 10 of the first embodiment, a finger hook collar piece 22 is provided to protrude outward from the insertion fold line 20. ing. That is, for example, the finger-hook collar piece 22 has a pair of cuts that intersect the insertion fold line 20 with the insertion fold line 20 between the outer flap 15 and the insertion flap piece 14 provided continuously above the rear side wall portion 12c. A U-shaped notch 24 including a line is provided in the central portion of the insertion fold line 20. And when the insertion flap piece 14 is bent via the insertion fold line 20, the finger hook collar piece 22 has a width of, for example, 5 to 20 mm along the surface direction of the outer flap 15, and 0.5-2. It protrudes from the insertion fold line 20 with a protruding length of 0 mm.

  Further, in the plastic box 30 of the second embodiment, the finger hook guide is provided at a position where the upper edge of the front side wall portion 12a, which is the other side 19 into which the insertion flap piece 14 is inserted, is notched and the finger hook collar piece 22 faces. A notch 23 is formed. That is, the finger hook guide notch 23 is formed by being cut into a semicircular shape, for example, and when the opening 17 is closed and locked by the inner flap 13 and the outer flap 15, the finger hook protruding from the insertion fold line 20 is locked. The collar piece 22 is arranged so as to face the notch width of the finger hook guide notch 23 and faces the finger hook guide notch 23.

  The plastic box 30 of the second embodiment also has finger hook collars 22 and / or finger hook guide cutouts 23 in addition to the same effects as the plastic box 30 of the first embodiment. Therefore, through the finger-hook collar piece 22 and / or the finger-hook guide notch 23, the inserted flap piece 14 can be easily pulled out from the inside of the opening 17, and the plastic box 30 can be opened more smoothly. It becomes possible to do.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the plastic box may have not only a rectangular shape but also other quadrangular cross-sectional shapes such as trapezoids and squares and openings. In addition, the end fold line for forming the wing-like portion at both ends of the insertion flap piece does not necessarily have to extend substantially perpendicular to the insertion fold line from the deepest part of the cut. It is possible to extend from this part or to incline with respect to the insertion fold line. Furthermore, it is not always necessary to provide the finger hook collar piece and the finger hook guide notch at the same time, and even when either one is provided, the plastic box can be opened more smoothly. Furthermore, it is not always necessary to provide the finger-hanging collar piece by a U-shaped notch for crossing the insertion fold line, and the finger-hanging guide notch has a semi-oval shape, a semi-elliptical shape, a rectangular shape, 3 It can also be formed in various shapes other than a semicircular shape such as a square shape. And not only the upper surface part of a plastic box but a bottom surface part can be made into the structure which can be easily opened by the wing-like part bent outside.

(A), (b) is a principal part perspective view which shows the condition which closes the opening part of an upper surface part explaining the structure of the plastic box which concerns on preferable 1st Embodiment of this invention. It is a top view which shows the expansion | deployment shape of the plastic sheet which comprises the plastic box which concerns on preferable 1st Embodiment of this invention. It is a top view which shows the condition which obstruct | occluded the opening part of the upper surface part of the plastic box which concerns on preferable 1st Embodiment of this invention. (A), (b) is a principal part perspective view which shows the condition which obstruct | occludes the opening part of an upper surface part explaining the structure of the plastic box which concerns on preferable 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,30 Plastic box 11 Plastic sheet 12a Front side wall part 12b Side wall part 12c Back side wall part 13 Inner flap 13a Inner flap base end part 14 Insertion flap piece 15 Outer flap 16 Wing-like part 16a Wing-like corner part 17 The opening 18 of the opening The two opposite sides 19 of the peripheral edge of the opening The other two opposite sides 20 of the peripheral edge of the opening Insertion fold line (bending line)
21 Incision 22 Finger hook collar 23 Finger hook guide notch 24 Collar notch 25 Longitudinal fold line 26 Lateral fold line 27 Joint piece 28 End fold line θ Angle of the wing-shaped part with respect to the inserted flap piece

Claims (5)

An insert flap piece made of plastic, bent inwardly on the inner side of each of the two opposite sides of the quadrangular opening, and connected to one of the other two opposite sides And folding the insertion flap piece into the inside of the opening between the other side of the other two opposite sides and the folded inner flap. A plastic box for closing the opening,
A locking mechanism is provided by locking the proximal end portion of the inner flap to the notches formed at both ends of the fold line from the outer flap of the insertion flap piece,
In addition, at both end portions of the insertion flap piece, a wing-like portion separated from the outer flap by the fold line is bent outward by the cutting, and inclined at an angle of 20 to 40 degrees with respect to the insertion flap piece. Plastic box that is provided to keep the state.   2. The plastic box according to claim 1, wherein both end portions of the insertion flap piece by the wing-like portion are rounded at a corner portion thereof.   The plastic box according to claim 1, wherein a finger hook collar piece is provided so as to protrude outward from the fold line.   The finger-hook guide notch is formed in the position which notches the other side where the said insertion flap piece is inserted, and faces the finger-hook collar piece of a front side wall part. Plastic box. The finger collar piece is formed outwardly from the fold line by forming a U-shaped cut piece for the collar piece including a pair of cut lines intersecting with a fold line from the outer flap of the insertion flap piece. The plastic box according to any one of claims 1 to 4, which is provided so as to protrude.