Push-in lock type packaging box

Abstract

To provide a push-in lock type packaging box which can be easily sealed with one hand without changing a direction and has a low risk of damaging a commodity when sealed.SOLUTION: In a push-in lock type packaging box that a push-in piece 7 is raised from an inner flap 5, the inner flap 5 and an outer flap 6 are successively folded back, and the push-in piece 7 is folded toward a front surface side of the outer flap 6, and is pushed into a cut groove 8 to seal the box, the push-in piece 7 has a mountain shape that a tip end protrudes from both sides in a width direction toward a center part, and a space between the cut groove 8 and a first rule line 9 of the outer flap 6 forms a tip fold piece 10, and a space between the cut groove 8 and a second rule line 11 forms a base fold piece 12. When sealing, when the push-in piece 7 is pressed against the tip fold piece 10 and the base fold piece 12 from the front surface side of the outer flap 6, the tip fold piece 10 and the base fold piece 12 are pushed in and bent, then the tip fold piece 10 is restored, the base fold piece 12 presses the push-in piece 7 against a back surface of the tip fold piece 10, and the inner flap 5 and the outer flap 6 are locked.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This invention relates to a push-lock type packaging box that can be easily locked and sealed without using staples or tape. [Background technology]

[0002] When shipping agricultural produce such as vegetables and fruits, packaging boxes with a locking structure that allows the produce to be quickly packed and sealed at the work site are often used. Patent Document 1 listed below describes this type of packaging box as shown in Figures 8 and 9.

[0003] This packaging box has a pair of side plates 51, 52 connected in the circumferential direction, an inner flap 53 is connected to the pair of side plates 51, and an outer flap 54 is connected to the other pair of side plates 52. An insertion piece 55 is formed on the inside of the inner flap 53 by cutting from the base toward the tip, cut grooves 56 are made in the pair of outer flaps 54 from the opposing edges at the tip, and fold lines 57 extending in the width direction are made in the insertion piece 55 at intervals from the tip.

[0004] When sealing this packaging box, the insertion piece 55 is raised from the inner flap 53, the inner flap 53 and the outer flap 54 are successively folded over, the insertion piece 55 is bent along the center fold line 57 while being inserted into the cut groove 56, and then the bent insertion piece 55 is restored to its original state so that the part of the outer flap 54 facing the cut groove 56 engages with the tip of the insertion piece 55. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-341655 A Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, when sealing a packaging box having the above-mentioned locking structure, the insertion piece 55 must be bent once around the center fold line 57 as an axis and inserted into the cut groove 56. At this time, steps such as changing the orientation of the box or changing the orientation of the packaging box with heavy agricultural products inside are required, making it practically difficult to seal the box with one hand.

[0007] Furthermore, when insert piece 55 is bent and inserted into groove 56, the tip of insert piece 55 may collide with the agricultural products contained in the box, causing damage to the agricultural products.

[0008] Therefore, an object of the present invention is to provide a push-lock type packaging box which can be easily sealed with one hand without turning it over and which reduces the risk of damaging the product when sealing. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention provides a circumferential wall having a pair of side plates, an inner flap connected to the pair of side plates, and an outer flap connected to the other pair of side plates, a push-in piece formed by cutting from a base portion to a tip side on the inside of the inner flap, and a cut groove formed from the opposing edges of the tip of the pair of outer flaps, A push-in lock type packaging box in which the push-in piece is raised from the inner flap, the inner flap and the outer flap are folded over in sequence, the push-in piece is folded toward the front surface side of the outer flap, and the push-in piece is pushed into the cut groove to seal the box, The pushing pieces have mountain-like tips that protrude from both sides in the width direction toward the center, In the portion of the outer flap located on the intermediate side of the cut groove, a first crease is made inclined from a position away from the cut groove on the opposing edge side toward the end of the cut groove, and the portion between the cut groove and the first crease is made into a leading fold. When sealing, when the push-in piece is pressed against the front fold piece from the front side of the outer flap, the front fold piece is bent as if being pushed around the first line as an axis, the tip of the push-in piece penetrates into the back side of the front fold piece through the cut groove, and the front fold piece bounces back to its original shape, thereby locking the inner flap and the outer flap together.

[0010] In addition, in the portion of the outer flap located on the outer end side of the cut groove, a second crease is made inclined from a position away from the cut groove on the opposite edge side toward the end of the cut groove, and the portion between the cut groove and the second crease is made into a base fold piece. When sealing, the base fold piece is bent as if pressed by the push-in piece around the second score line, and when the tip of the push-in piece slips through the cut groove into the back side of the leading fold piece, the base fold piece rebounds and restores its shape, pressing the push-in piece against the back side of the leading fold piece, thereby locking the inner flap and the outer flap together.

[0011] Furthermore, the relationship between the acute angle α between the opposing edges of the tip of the outer flap and the first score line, the acute angle β between the opposing edges of the tip of the outer flap and the primary cut portion of the cutting groove, and the acute angle γ between the center line in the width direction of the push-in piece and the tip edge is β>γ>α, so that the push-in piece can be pushed smoothly into the cutting groove.

[0012] In addition, the first score line is cut so that it can be folded in reverse, When the tip fold is pulled up around the first crease in the sealed state, the tip of the push-in piece can be pulled out of the cut groove of the outer flap, enabling the package to be opened.

[0013] In addition, engagement protrusions are provided on both sides of the tip of the pushing piece so as to protrude from the tip, The cutting groove has an end portion bent to correspond to a side edge of the pushing piece, When the pushing piece is pushed into the cut groove, the engaging projection of the pushing piece engages with a portion of the outer flap facing the terminal end of the cut groove.

[0014] In addition, a stepwise crease is formed at the base of the pressing piece, the stepwise crease being offset from the crease at the base of the inner flap in accordance with the thickness of the outer flap; When the push-in piece is folded toward the surface side of the outer flap with the step line as an axis, the push-in piece overlaps and fits along the surface of the outer flap. Effect of the Invention

[0015] In the push-lock packaging box of this invention, the tip of the push-in piece formed on the inside of the inner flap is made into a mountain shape, and a first line is made diagonally in the part of the outer flap that is located middle side of the cut groove to form the front fold piece. By simply pressing the push-in piece from the front side of the outer flap, the tip of the push-in piece slips into the back side of the front fold piece, locking the inner flap and outer flap together, so that the sealing operation can be easily performed with one hand without changing the orientation.

[0016] In addition, a second line is made diagonally in the part of the outer flap that is located on the outer side of the cut groove to form a base fold, and when sealing, the push-in piece is received by the base fold from the back side and pushed in vertically. This makes it less likely that the tip of the push-in piece will hit the agricultural produce or other merchandise stored inside, reducing the risk of damaging the merchandise.

[0017] Furthermore, the first line, which serves as the axis for folding the front fold piece, can be made to be foldable in reverse by cutting a slit in it. When the front fold piece is folded up in a sealed state, the tip of the push-in piece can be pulled out of the slit in the outer flap, making it easy to open, thereby facilitating inspection and removal of the product. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view showing a sealed state of a push-in lock type packaging box according to an embodiment of the present invention; [Diagram 2] FIG. 1 shows a blank of the packaging box of the same [Diagram 3] FIG. 4 is a partial perspective view showing the state before sealing of the above. [Figure 4] FIG. 13 is a partial perspective view showing the sealing process of the above [Diagram 5] FIG. 4 is a partial perspective view showing the sealed state of the above. [Figure 6] FIG. [Figure 7] FIG. 1 is a partial view of a blank showing another form of the pushing piece of the same [Figure 8] A perspective view showing the state before sealing of the packaging box described in Patent Document 1. [Figure 9] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] [overview] The push-lock packaging box sealed as shown in Figure 1 is a rectangular box used to store agricultural products such as vegetables and fruits shipped from farmers. It is assembled from a blank as shown in Figure 2, and after going through the process shown in Figures 3 and 4, the top is closed with a locking structure as shown in Figure 5.

[0020] [blank] (Overall shape) As shown in Figure 2, in the blank for this packaging box made of corrugated cardboard, the direction of the corrugations that have the greatest strength is oriented vertically, and each pair of width side panels 1 and length side panels 2 that form the peripheral wall are alternately connected via creases. A joint piece 3 is connected to the outer end of the side panel 1 located at the end of the blank, via a crease.

[0021] Bottom flaps 4a, 4b are connected to the lower ends of each pair of side plates 1, 2 via creases to form a bottom wall 4 when assembled.

[0022] An inner flap 5 is connected to the upper ends of the pair of side plates 1, and an outer flap 6 is connected to the upper ends of the pair of side plates 2, each with a crease therebetween. A push-in piece 7 is formed on the inside of the inner flap 5 by cutting from the base to the tip. Also, slit-shaped cut grooves 8 are formed on both sides of the outer flap 6 from the tip to the edge that will be the opposing edge when sealed.

[0023] (Pushing piece) The pushing piece 7 has a mountain-like tip that protrudes from both sides in the width direction toward the center, and engaging projections 7a are provided on both sides of the tip of the pushing piece 7. A slight flat portion is provided in the center between the oblique sides on both sides of the tip of the pushing piece 7. In addition, the cut line that defines the outline of the tip side of the pushing piece 7 has multiple connecting portions so that the pushing piece 7 does not separate from the inner flap 5 until the sealing operation.

[0024] In addition, a stepped line 7b is provided at the base of the push-in piece 7 at a position offset from the line at the base of the inner flap 5 by a dimension corresponding to the thickness of the cardboard, thereby avoiding interference with the end of the outer flap 6 when sealing.

[0025] When the blank is manufactured using a corrugator, the step crease 7b may be made parallel to the ridge crease 7c which is necessarily continuous with the boundary between the side surface portion and the top surface portion in the manufacturing process.

[0026] (Cutting groove and its vicinity) The slit 8 is made up of a primary slit 8a that cuts obliquely from the opposing edge of the outer flap 6 toward the outer end, a secondary slit 8b that bends from the end of the primary slit 8a and cuts toward the outer end of the outer flap 6 parallel to the boundary with the side panel 2, and a tertiary slit 8c that bends from the end of the secondary slit 8b and cuts toward the base side of the outer flap 6. The secondary slit 8b and the tertiary slit 8c are the terminal ends of the slit 8, and the end of the tertiary slit 8c is curved to roll up.

[0027] In the portion of the outer flap 6 located on the middle side of the slit 8, a first crease 9 is made that is inclined from a position away from the slit 8 on the opposite edge side toward the end of the slit 8, and the portion between the slit 8 and the first crease 9 forms a triangular tip fold 10. The inclination of the first crease 9 is gentler than the inclination of the hypotenuse at the tip of the push-in piece 7.

[0028] The first score 9 is a lead score that is an intermittent score pressed from the back side of the cardboard like a normal score and a cut that penetrates the cardboard, making it possible to reverse fold the cardboard.

[0029] In addition, in the portion of the outer flap 6 located on the outer end side of the cut groove 8, a second score 11 is made which is inclined from a position away from the cut groove 8 on the opposite edge side in a direction approaching the end of the cut groove 8, and the portion between the cut groove 8 and the second score 11 is formed into a trapezoidal base fold piece 12.

[0030] The second scores 11, like the first scores 9, are also lead scores in which the scores pressed from the back surface of the cardboard and the cuts are intermittent, thereby reducing the resistance to bending.

[0031] The relationship between the acute angle α between the opposing edge of the tip of the outer flap 6 and the first score 9, the acute angle β between the opposing edge of the tip of the outer flap 6 and the primary cut portion 8a of the cut 8, and the acute angle γ between the center line in the width direction of the push-in piece 7 and the tip edge is β>γ>α. In this example, the angle α is set to 47°, the angle β is set to 75°, and the angle γ is set to 70°.

[0032] [Production from blanks and use] The blank is folded along the boundary line between the side panels 1 and 2 that are diagonally opposite the peripheral wall, and the transition piece 3 is attached to the inner surface of the side end of the opposite side panel 2, and stored in a flat state. When storing contents such as agricultural products, each pair of side panels 1 and 2 is made into a three-dimensional square tube, each pair of bottom flaps 4a and 4b forms a bottom wall 4, and the contents are stored through the opening on the top surface.

[0033] [Seal] When sealing this packaging box, first, as shown in Fig. 3, the push-in pieces 7 are raised from the inner flaps 5, and each pair of the inner flaps 5 and the outer flaps 6 are folded over. Then, as shown in Fig. 4, the push-in pieces 7 are folded toward the front surface of the outer flaps 6, and pressed against the front fold pieces 10 and the base fold pieces 12 that face the cut grooves 8.

[0034] As a result, the leading fold piece 10 is bent as if being pushed in around the first score line 9, and the base fold piece 12 is bent as if being pushed in around the second score line 11, so that the tip of the push-in piece 7 is received by the base fold piece 12 and slips into the back side of the leading fold piece 10 through the cut groove 8.

[0035] At this time, the leading folding piece 10 is deeply pressed into the protruding middle part of the tip of the pushing piece 7, and the pushing piece 7 is smoothly and sequentially pressed into the groove 8 from the center of the tip to both sides.

[0036] Thereafter, as shown in Figure 5, the leading fold piece 10 rebounds to its original shape, and the base fold piece 12 rebounds to press the push-in piece 7 against the back surface of the leading fold piece 10, so that the tip of the push-in piece 7 engages with the back surface side of the leading fold piece 10 facing the primary cut-out portion 8a of the cut groove 8 of the outer flap 6, and the engagement protrusions 7a on both sides of the push-in piece 7 engage with the back surface side of the portion of the outer flap 6 facing the secondary cut-out portion 8b and tertiary cut-out portion 8c of the cut groove 8, thereby locking the inner flap 5 and the outer flap 6 in a closed state.

[0037] In this locked state, the push-in piece 7 is bent at a stable position with the step line 7b as an axis and overlaps along the surface of the outer flap 6, resulting in a sealing form that looks good.

[0038] In addition, in the sealed state, the distance between the secondary cut portions 8b of the cut grooves 8 of the opposing outer flaps 6 is narrower than the width between the tips of the engaging protrusions 7a on both sides of the push-in piece 7 and wider than the width on the base side of the engaging protrusions 7a. Therefore, even if there is a misalignment in the processing position when punching out the blank during production, the push-in piece 7 reliably engages with the portion of the outer flap 6 facing the cut groove 8.

[0039] [effect] In the push-in lock type packaging box as described above, the tip of the push-in piece 7 is formed into a mountain shape, and a first line 9 and a second line 11 are placed diagonally in the part of the outer flap 6 facing the cut groove 8 to form a tip fold piece 10 and a base fold piece 12. By simply pressing the push-in piece 7 from the front side of the outer flap 6, the tip of the push-in piece 7 slips into the back side of the tip fold piece 10, locking the inner flap 5 and the outer flap 6 together, so that the sealing operation can be easily performed with one hand without having to change the orientation.

[0040] In addition, when sealing, the pushing piece 7 is received by the base folding piece 12 from the back side and pushed vertically, so that the tip of the pushing piece 7 is unlikely to hit the stored product such as agricultural produce, and the risk of damaging the product is reduced.

[0041] Furthermore, when the package is sealed, as shown in FIG. 6, by folding the front fold piece 10 upward along the first line 9, the front end of the push-in piece 7 can be pulled out of the cut groove 8 of the outer flap 6, allowing the package to be easily opened, facilitating inspection and removal of the product.

[0042] [others] In the above embodiment, an example was given of a pushing piece 7 having engaging protrusions 7a protruding from both sides of its tip. However, even if such engaging protrusions 7a are omitted and both side edges of the pushing piece 7 extend straight from the base to the tip as shown in Figure 7, when the pushing piece 7 is pushed into the cutting groove 8, the tip of the pushing piece 7 engages with the back side of the front fold piece 10, thereby ensuring reliable sealing.

[0043] Furthermore, when manufacturing a blank by punching with a die cutter, there is no need to make the ridge line 7c at the base of the pressing piece 7 as in the above embodiment, and therefore it is sufficient to make only the stepped line 7b, as shown in Figure 7.

[0044] Furthermore, when the pushing piece 7 is pressed into the cut groove 8, the pushing piece 7 is folded in a valley at the center of the width direction so that the surface side is recessed. Therefore, when manufacturing the blank, a guide line 7d such as a lead line that guides the valley fold to a predetermined position can be made in the center of the width direction of the pushing piece 7, as shown in Figure 7.

[0045] In the above embodiment, a push-type locking structure is applied to a so-called grooved packaging box. However, a locking structure similar to that of the above packaging box can also be applied to a so-called slave-type packaging box in which a pair of side panels 1, 2 are connected to the periphery of the bottom wall, and an inner flap 5 is connected to one pair of side panels 1 and an outer flap 6 is connected to the other pair of side panels 2. [Explanation of symbols]

[0046] 1,2 Side plate 3. Passage pieces 4 Bottom wall 4a,4b Bottom flap 5 Inner flap 6 Outer flap 7 Push piece 7a Engaging protrusion 7b Stepwise ruled lines 7c Ridge line 7d Guiding lines 8 Cutting groove 8a Primary notch 8b Secondary notch 8c Tertiary notch 9 First Ruled Line 10 Tip fold 11 Second Ruled Line 12 base pieces

Claims

1. The device has a pair of side plates (1, 2) each forming a peripheral wall, an inner flap (5) is connected to the pair of side plates (1) and an outer flap (6) is connected to the other pair of side plates (2), a push-in piece (7) is formed on the inside of the inner flap (5) by cutting from the base toward the tip side, and a cut groove (8) is formed in the pair of outer flaps (6) from the opposing edges of the tip, A push-in lock type packaging box in which the push-in piece (7) is raised from the inner flap (5), the inner flap (5) and the outer flap (6) are successively folded over, the push-in piece (7) is folded toward the front surface of the outer flap (6), and the box is pushed into the notch (8) to seal the box, The pushing piece (7) has a mountain-like shape with its tip protruding from both sides in the width direction toward the center, A first crease (9) is formed in a portion of the outer flap (6) located on the intermediate side of the cut groove (8), the first crease (9) being inclined from a position away from the cut groove (8) on the opposite edge side toward the end of the cut groove (8), and the portion between the cut groove (8) and the first crease (9) is defined as a leading fold (10); When sealing, when the push-in piece (7) is pressed against the leading fold piece (10) from the front side of the outer flap (6), the leading fold piece (10) is bent as if being pushed around the first line (9) as an axis, the tip of the push-in piece (7) slips into the back side of the leading fold piece (10) through the cut groove (8), the leading fold piece (10) rebounds to its original shape, and the inner flap (5) and the outer flap (6) are locked together in this push-lock type packaging box.

2. A second crease (11) is formed in a portion of the outer flap (6) located on the outer end side of the cut groove (8), the second crease (11) being inclined from a position away from the cut groove (8) on the opposite edge side toward the end of the cut groove (8), and the portion between the cut groove (8) and the second crease (11) is defined as a base fold piece (12).

2. The push-in lock type packaging box according to claim 1, wherein, during sealing, the base fold (12) is bent so as to be pushed in by the push-in piece (7) around the second crease (11) as an axis, and when the tip of the push-in piece (7) slips through the cut groove (8) into the back side of the leading fold (10), the base fold (12) rebounds and restores its shape, pressing the push-in piece (7) against the back side of the leading fold (10), thereby locking the inner flap (5) and the outer flap (6).

3. The push-in lock type packaging box according to claim 2, characterized in that the relationship between the acute angle α between the opposing edges of the tip of the outer flap (6) and the first score line (9), the acute angle β between the opposing edges of the tip of the outer flap (6) and the primary cut portion (8a) of the cut groove (8), and the acute angle γ between the center line in the width direction of the push-in piece (7) and the tip edge is β > γ > α.

4. The first score line (9) is scored so that it can be folded back, 3. The push-in lock type packaging box according to claim 1 or 2, characterized in that when the front fold piece (10) is folded upward around the first line (9) in a sealed state, the front end of the push-in piece (7) can be pulled out of the cut groove (8) of the outer flap (6) to open the box.

5. The pushing piece (7) has an engagement protrusion (7a) protruding from both sides of the tip thereof. The cut groove (8) has an end portion bent to correspond to the side edge of the push-in piece (7), 3. A push-in lock type packaging box as described in claim 1 or 2, characterized in that when the push-in piece (7) is pushed into the cut groove (8), the engagement protrusion (7a) of the push-in piece (7) engages with a portion of the outer flap (6) facing the terminal end of the cut groove (8).

6. A stepwise crease (7b) is formed at the base of the push-in piece (7) so as to be offset from the crease at the base of the inner flap (5) in accordance with the thickness of the outer flap (6), A push-in lock type packaging box as described in claim 1 or 2, characterized in that when the push-in piece (7) is folded toward the surface side of the outer flap (6) around the step line (7b) as an axis, the push-in piece (7) overlaps so as to fit along the surface of the outer flap (6).

Images