JPH0732419Y2 - Prefabricated carton - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to the improvement of a prefabricated carton, which does not require the use of an adhesive and enables the locking work during box making to be simple and complete. is there.

(Prior Art) Various types of carton corner locking means that do not use an adhesive have been conventionally known.

As an example, a slit parallel to the vertical side is formed on one of the adjacent side plates of the prefabricated paper box, and the outward projecting piece and the inward projecting piece are substantially S-shaped in the middle of the slit. And a small slit is formed in the flap as a length that allows the slits to be inserted and inserted into the side plate in the up-down direction of the other side plate, and a small slit is provided in the flap, and the above-mentioned outward projecting piece and inward projecting piece. It is known to assemble by inserting into a small slit (Jitsuko Sho 59-40261).

In addition, standing walls such as a front plate, a rear plate, and left and right side plates that are connected to each end edge of the bottom plate, a lid plate that extends to the edge of the rear plate, and two sides that connect between the adjacent rising walls. The folded corner flaps provided, the engaging tongues continuously provided on one side of the folding lines provided on the radial diagonal lines of the respective folded corner flaps, and the engaging tongues continuously provided on the other side of the folding lines of the respective folded corner flaps. Each of the rising walls comprises a notch groove provided at a position corresponding to the engaging tongue piece, and the engaging tongue piece is folded back into the notch groove of the container blank so as to be engaged. It is also known for containers for containers (Shokaisho 62
-45213).

(Problems to be solved by the invention) However, in the former case, since the corresponding part of the side plate into which the flap is inserted is not a notch but a slit without a gap, the work of inserting the tip of the flap is not easy, and the side plate is not easily inserted. The slit may cause the inward and outward facing S-shaped protrusions to collide with the tip of the flap to hinder smooth insertion work.

In the case of the latter, the process of folding back each engaging tongue,
Further, a step of engaging this with the notch groove is required, and in any case, if the carton size is changed, it is also necessary to replace the mold or the pushing lock claw with the change of the lock position. There is a problem in terms of workability, lack of mass productivity, and high cost.

(Means for Solving the Problem) The present invention solves the above-mentioned problems of the prior art and improves the carton assembly workability and reduces the cost. In a prefabricated carton in which a carton body is configured by locking a flap extending from the side edge of one side plate, the other side plate is provided with a locking edge that is substantially along a virtual pushing line and the locking. A notch portion having an insertion edge formed at a position spaced from the edge toward the center of the side plate is formed, and the flap has a tip to insert the insertion tongue engageable with the insertion edge and the locking. Projected in the flap fold line direction by strong taper-shaped short side slits crossing the pushing virtual line from opposite directions at the upper and lower sides corresponding to the edges, and weak taper long side slits connecting the tips of the short side slits. Locking protrusion The present invention relates to a prefabricated carton, which is characterized by forming a rise.

(Operation) After bending the side plate that constitutes the carton body at a right angle, bend the flap on one of the adjacent side faces to the side plate side while inserting the insertion tongue at the tip into the notch in the other side plate. Be locked on the back side of.

Then, the flap is pushed inward from the virtual imaginary line toward the inside of the carton, and the weak taper-shaped locking projection gradually protrudes from the portion substantially coincident with the virtual imaginary line of the flap toward the tip protruding in the flap folding line direction. The carton is pushed inward from the notch so as to slide along the locking edge, and the locking projection is locked to the back side by the locking edge of the side plate to complete the assembly of the carton.

(Embodiment) The specific contents of the present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 1 shows an exploded view of an assembled carton which is an embodiment of the present invention.

In the figure, 1 is a bottom plate, 6 and 11 are side plates connected to the bottom plate 1, and a top plate 16 and a stack plate 18 are connected to the side plate 11, respectively.

The bottom plate 1 has side plates 2 and 2, and the top plate 16 has side upper plates 1.
7 and 17 are connected to each other, and flaps 7, 7 and 12 and 12 are connected to the side plates 6 and 11, respectively.

Two notches 3 and 3 are formed on each of the side plates 2 and 2, and one side of each notch serves as locking edges 4 and 4 substantially along the pushing virtual line AA of the carton. Insertion edges 5 and 5 are formed at opposite sides of the notches 3 and 3, that is, at positions spaced from the locking edge toward the center of the carton by a predetermined distance.

Further, the flaps 7, 7, 12, 12 are formed with insertion tongue pieces 8, 8, 13, 13 at the tips thereof which can be engaged with the insertion edge, and the pushing virtual line AA which is close to the flap fold line. Slits 9 along the virtual pushing line BB corresponding to
9, 14, 14 are formed. The slits are strong taper-shaped short side slits 9b, 9c, 14b, 14c intersecting the pushing virtual line BB from opposite directions in the vertical direction and a weak taper long side slit 9a for connecting between the tips of the slits. It consists of 14a slit. The short-side slits 9b and 14b prevent breakage of the tips of the long-side slits 9a and 14a, facilitate pushing of the locking projections, and impart elasticity.

Further, the long side slits 9a, 14a gradually project from the pushing virtual line BB in the direction of the flap fold line, and are weakly tapered locking projections.
Forming 10, 10 and 15, 15. It is functionally preferable that the projections of the locking projections 10 are formed to be larger than the projections in the opposite direction formed by the short side slits 9b and 14b and the long side slits 9a and 14a. .

However, the carton blank is folded inward along each folding line and sequentially assembled into a box shape as shown in FIG.

That is, after the side plates 2 and 2 are folded inward, the flaps 7 and 12 connected to the side plates 6 and 11 are folded inward, and the side plates 6 and 11 themselves are folded inward (see FIG. 3 (A)). Insert the tongues 8 and 13 of the flaps 7 and 12 into the notches 3 and 3, and attach the tips to the back sides of the respective insert edges 5 and 5 as shown in FIG. 3B. At this time, the push-in virtual line AA of the side plates 2 and 2 and the push-in virtual line B-B of each of the flaps 7, 7, 12, 12 overlap and coincide with each other).

Then, by using the pushing turntable along the pushing virtual line BB, the locking projections 10 and 15 are pushed inward of the carton so that the tips of the locking projections 10 and 15 are located in the notch 3 of the side plate 2. The assembling of the carton body is completed by engaging with the back side of the locking edge 4 (see FIG. 3 (C)).

Finally, the laminated plate 18 is placed outside of the side plate 6, and the side plates 17 and 17 are placed outside of the side plates 2 and 2, respectively, to carry out the adhesion polymerization.

Although FIG. 3 shows only the case where one flap 7 is attached to one notch 3 of the side plate 2, the other flap 12 is attached to the other notch 3 of the side plate 2 as well. Is exactly the same as.

(Effect of the Invention) As described above, in the present invention, in the prefabricated carton in which the adjacent side plates are locked by the flaps extending from the side edges of the one side plate to form the carton body part, the other side plate is Forms a cutout portion having a locking edge substantially along the virtual pushing line and a inserting edge formed at a position spaced from the locking edge toward the center of the side plate, and at the tip of the flap. An insertion tongue engageable with the insertion edge, a short side slit having a strong taper shape that crosses the pushing virtual line from opposite directions vertically corresponding to the engagement edge, and a tip of the short side slit. Since a weak taper-shaped long side slit for quick connection and a locking protrusion protruding in the flap fold line direction are formed, a notch is provided compared to the conventional insertion into the slit of the flap. Easy to insert into parts It is reliable, and since the locking projection formed on the flap has a weak taper, it can be pushed continuously and gradually without local and sudden pushing, and the locking projection is not damaged Secure locking.

Further, since the locking edge and the weakly tapered locking projection are engaged in a wide area, the locked state is stable.

Furthermore, when assembling the carton, the step of engaging the locking projection of the flap with the side plate is only one step, and moreover, the above step only needs to be pressed inward linearly along the virtual pushing line, Even if the carton size changes
While changing the mold and fine-adjusting the push-in lock claw were troublesome as in the past, it is sufficient to adjust the movement width of the carton.
A pressurizing turntable enables mechanization such as automatic operation, and can significantly reduce costs by speeding up assembly and shortening the time for dimension change.

[Brief description of drawings]

FIG. 1 is a development view showing an example of a carton blank according to the present invention, a perspective view showing an assembled state of the carton blanks of FIGS. 2 and 1, and FIG. 3 shows a state in which a flap is attached to a side plate. FIG. 1 ... Bottom part, 2, 6, 11 ... Side plate 3 ... Notch part, 4 ... Locking edge 5 ... Inserting edge, 7, 12 ... Flap 8, 13 ... Inserting tongue piece, 9, 14 …… Slits 9a, 14a …… Long-side slits 9b, 9c, 14b, 14c …… Short-side slits 10, 15 …… Locking projections, 16 …… Top plate 17 …… Side top plate, 18 …… Layered plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshima Katsumi 146 Yuzaki, Kawanishi-cho, Isojo-gun, Nara

Claims (1)

[Scope of utility model registration request] 1. A prefabricated carton in which adjacent side plates are locked by a flap extending from a side edge of one side plate to form a carton body, and the other side plate is substantially along a virtual pushing line. A notch having an engaging edge and an inserting edge formed at a position spaced apart from the engaging edge toward the center of the side plate, and the flap is engageable with the inserting edge at the tip. Insertion tongue, a short side slit of a strong taper shape that crosses the pushing virtual line from opposite directions in the vertical direction corresponding to the locking edge, and a weak taper length that connects the tips of the short side slits. An assembling type carton, characterized in that a side slit is formed with a locking protrusion protruding in the flap folding line direction.