CN115003604B - couple container - Google Patents

Abstract

The present invention relates to a couple container that combines or separates two or more containers of the same shape with mutually facing coupling parts, thereby reducing manufacturing costs, easily selectively combining contents, and reducing leakage of contents. Possibility to easily open and close the bottle cap by combining it.

Description

couple container

Technical field

The present invention relates to a couple container, specifically, to a couple container in which two or more containers facing each other can be combined or separated from each other.

Background technique

Generally, containers such as polyethylene terephthalate (PET), polyacrylonitrile (PAN), polyvinyl chloride (PVC), and polypropylene (PP) are made by blow molding plastic materials and are widely used to store or preserve various beverages such as soft drinks, mineral water, tea, and wine, or powdered contents, and to conveniently take out the contents as needed.

This kind of container has an interior divided to accommodate the contents, an opening is formed in a local area of the upper part for the entry and exit of the contents, and a bottle cap for restricting the entry and exit of the contents is provided on the opening.

Furthermore, when the contained content is a liquid, the container generally contains one kind of content, and the user may put his mouth in the open opening and drink the content.

As described above, one container is usually used one-to-one for each user, and the type of liquid content is also limited to one.

For example, when two or more types of beverages are to be stored, containers corresponding to the respective beverages are prepared. However, since each container is separated from each other, there is a problem that it is difficult to store or carry the beverages.

In addition, whether one person drinks the drink in a container, or 2 or more people share the drink, a container can only hold one kind of drink, so there are two people with different drink tastes who want to drink a little each. When purchasing a drink, you must purchase a container that contains the drink you want to drink.

In addition, there is also the problem of wasting resources in that it is difficult to store the container for a long time once it is opened without finishing the contents in the container, and the remaining contents are eventually thrown away.

For the above reasons, related industries have developed a set of couple containers that combine two containers into one set so that two or more users can drink separately in a hygienic and convenient manner, or they can choose to drink from a combined container according to their preferences. Drinks inside.

In the prior art, Korean Patent Publication No. 10-2013-0108796 (hereinafter referred to as "prior art 1") and Korean Authorized Patent No. 10-1022665 (hereinafter referred to as "prior art 2") disclose that a protruding coupling portion is formed on one of the mutually facing coupling surfaces, and a recessed coupling portion corresponding to the protruding coupling portion is formed on the other coupling surface, and coupling and separation can be performed by inserting the concave-convex structure.

In the paired containers disclosed in the prior art 1, a protruding coupling portion is formed on the side wall of one container, and a recessed coupling portion is formed in the other container. Therefore, when coupling the containers, the protruding coupling portion of one container is inserted into the recessed portion of the other container, and in this state, the coupling is performed by relative rotation.

The prior art 1 is a case where the containers are coupled or separated with each opening of each container covered with a bottle cap. When the containers are coupled or separated with the bottle cap opened, the contents contained in the container may occur. Possibility of leakage of contents through angled openings. That is, when combining or separating the couple containers according to the existing technology, attention should be paid to the inconvenience of having to cover the bottle cap.

Furthermore, in the prior art 1, not only is it necessary to manufacture containers with protruding coupling parts and containers with recessed coupling parts separately, but also different types must be manufactured to be used as couple containers, so there are complex problems and difficulties in managing each type separately.

In addition, in one embodiment of Prior Art 2, a single-form container is manufactured in which a protruding coupling portion is formed at a position eccentric from the lateral center to one side with respect to the up-and-down direction of the container, and a concave-shaped coupling portion is formed. The coupling part is formed at a position from the transverse center to the other side core with respect to the up and down direction of the container. When the two containers are arranged oppositely, the opposing protruding coupling part is forcibly inserted into the recessed coupling part or from the recessed coupling part. Type binding part separation.

In the prior art 2, when two containers are coupled or separated, a force and movement greater than the coupling pressure occur in the direction of coupling, causing the contents in the container to momentarily tilt to one side (yaw motion). ), at this time, if the bottle cap is opened, the contents may leak during the coupling or separation movement.

Korean Patent Publication No. 10-2013-0107126 (hereinafter referred to as 'Prior Art 3') discloses a prior art that prevents leakage of contents from the shaking motion.

It can be confirmed from FIGS. 7 and 8 that in the prior art 3, the way to couple or separate the two couple containers 1 is to move the rail protrusions 2 and the rail grooves 3 formed on the side walls of the container 1 toward the container 1 The opening formation direction on the upper side is realized, so that the effect of reducing the shaking motion of the liquid content corresponding to the positional movement of the container 1 during coupling or separation can be expected.

However, the prior art 3 is manufactured by injection molding, so the shape of the opening can only be formed into the same shape as the internal horizontal cross section.

Here, most beverage containers are made by blow molding, and the shape of the container made by blow molding is such that the upper portion, excluding the opening, is covered by approximately the same thickness range as the side walls. The thickness range depends on the size of the container and the thickness and shape of the parison. The thickness of the container manufactured in this way will vary depending on the shape of each location, but the shape and thickness will be within a predetermined range due to the parison.

Summary of the invention

The present invention is proposed to solve the problems of the prior art, and its purpose is to provide a couple container that can reduce the manufacturing cost by connecting or separating two or more containers of the same shape with mutually facing connecting parts. , it is easy to selectively combine the contents and reduce the possibility of leakage of the contents, and the bottle cap can be easily opened and closed through combination.

In addition, an object of the present invention is to provide a couple container which is made by blow molding. The side wall portions maintain the same level of thickness and are bonded to each other at the same bonding portion facing each other, thereby realizing the mold. simplification, reducing manufacturing costs and product management costs.

In order to achieve the above-mentioned purpose, according to the couple container of the present invention, it is a container shape with an opening formed on the upper side, including a coupling portion, wherein the coupling portion is formed with a protruding portion having a protruding surface on one side, based on a reference position set in a lateral direction relative to the up-down direction of the container, and the protruding surface protrudes from the reference surface to form a step, and a recessed portion having a recessed surface is formed on the other side, based on the reference position, and the recessed surface is recessed from the reference surface to form a step, and has a shape in which the end of the protruding portion adjacent to the recessed portion protrudes from the reference position toward the recessed portion to extend a preset first interval, and the end of the recessed portion adjacent to the protruding portion is recessed from the reference position toward the protruding portion to extend a preset second interval, and the protruding portion is connected. The boundary surface between the end of the protrusion facing the recessed portion and the end of the recessed portion facing the protrusion forms an acute angle with respect to the protrusion and the recessed portion respectively with the reference position as the center, so that the shapes of the reference surface and the protrusion and the recessed portion are continuously formed in the up-down direction of the container, wherein a deformation guide groove or a deformation guide protrusion is also formed in the protrusion, and the deformation guide groove is formed by extending concavely from the protruding surface toward the up-down direction at the middle part in the lateral direction relative to the up-down direction of the container, and the deformation guide protrusion is formed by extending convexly from the recessed surface toward the up-down direction, and a deformation guide protrusion or a deformation guide groove is also formed in the recessed portion, which is inserted into each other corresponding to the relatively formed deformation guide groove or deformation guide protrusion.

Furthermore, a first supporting surface protruding from the reference surface by a predetermined height to form the protruding portion and a second supporting surface recessed from the reference surface by a predetermined height to form the recessed portion are formed as the interface surface. Angle above acute angle.

Furthermore, the first supporting surface and the second supporting surface form an acute angle with respect to each of the protruding surface and the recessed surface in an opposite direction to the interface surface.

Furthermore, a locking protrusion or a locking groove is formed in the middle portion of the container in the up-down direction of the interface toward the protruding surface of the recessed portion based on the reference position, based on the reference position, A locking groove or locking protrusion corresponding to the locking protrusion or locking groove is formed on the recessed surface portion facing the protrusion.

The shape and volume of the interior of the recessed portion are determined by the shape and size of the protruding portion inserted relative to the protruding portion.

The lower portion of the opening including the coupling portion is blow molded into one body with a predetermined thickness range.

According to the structure of the present invention described above, containers having the same shape and produced by blow molding are inserted into each other and coupled or separated by sliding up and down in a state where the coupling parts are arranged. Since they are produced by a single-shaped mold, It saves production costs and can be selectively combined with other contents, and the container is easy to manage due to its single shape. In addition, during the process of combining or separating containers, it is possible to prevent the contents from shaking even when the openings of the containers are opened, thereby reducing the content ejection caused by shaking, and by turning one of the containers upward. The bottle cap can be combined or separated by sliding sideways, making it easy to open and close the bottle cap.

Description of drawings

Figure 1 is a schematic diagram of the structure of a couple container according to an embodiment of the present invention;

FIG. 2 is a system diagram showing a plan state for explaining the joint structure of FIG. 1;

3a to 3c are planar state system diagrams for illustrating the process of coupling the coupling parts facing each other to each other in the horizontal direction;

4a to 4c are cross-sectional views illustrating the structure and operation of a mold for manufacturing the container including the coupling portion in FIG. 1;

Fig. 5 is a perspective view showing a modification of the present invention and the combination relationship of the modification;

6 is a schematic sectional perspective view for explaining the arrangement of the locking protrusion and the locking groove.

Figure 7 is a perspective view showing the coupling relationship between couple containers according to the prior art;

FIG. 8 is a planar state cross-sectional view showing a middle position of FIG. 7 .

Detailed ways

The present invention proposes a couple container as an optimal form, the couple container is a container shape with an opening formed on the upper side, including a coupling portion, the coupling portion is formed with a protruding portion having a protruding surface on one side on at least one reference surface in the side surface, based on a reference position set in the lateral direction relative to the up and down direction of the container, the protruding surface protrudes from the reference surface to form a step, and based on the reference position, a recessed portion having a recessed surface is formed on the other side, the recessed surface is recessed from the reference surface to form a step, and has a shape in which the end of the protruding portion adjacent to the recessed portion protrudes from the reference position toward the recessed portion to extend a preset first interval, and the end of the recessed portion adjacent to the protruding portion is recessed from the reference position toward the protruding portion to extend a preset second interval, The boundary surface connecting the end of the protrusion toward the recessed portion and the end of the recessed portion toward the protrusion forms an acute angle with respect to the protrusion and the recessed portion respectively with the reference position as the center, so that the shapes of the reference surface and the protrusion and the recessed portion are continuously formed in the up-down direction of the container, wherein a deformation guide groove or a deformation guide protrusion is also formed in the protrusion, and the deformation guide groove is formed by extending concavely from the protruding surface toward the up-down direction at the middle part in the lateral direction relative to the up-down direction of the container, and the deformation guide protrusion is formed by extending convexly from the recessed surface toward the up-down direction, and a deformation guide protrusion or a deformation guide groove is also formed in the recessed portion, which is inserted into each other corresponding to the relatively formed deformation guide groove or deformation guide protrusion.

The terms or vocabulary used in this specification and the scope of the claims should not be limited to their common or dictionary meanings, but should be based on the principle that the inventor can appropriately define the term concept in order to use the best method to explain his invention. Meanings and concepts that are interpreted as consistent with the technical idea of the present invention.

In addition, the embodiments described in the specification of the present invention and the structures illustrated in the diagrams are merely preferred embodiments of the present invention and do not represent all technical ideas of the present invention. Therefore, it should be understood that when applying for the present invention, there may be a variety of equivalents and modifications that can replace the present invention.

Moreover, when describing the present invention, the expression "upper side" refers to the part of each component located in the opposite direction of the center of the earth or in its direction, and the expression "lower side" refers to the part of each component located in the direction of the center of the earth or in its direction. Therefore, the description is based on the assumption that the opening of the container is on the upper side.

Furthermore, when describing the present invention, the expression "one side" refers to a portion of a container with the opening on the upper side that is in any direction or other direction based on the horizontal center of the surface on which the coupling portion is formed, and the other side The expression refers to the part located in other directions or other directions based on the horizontal center of one surface, and is explained accordingly.

Furthermore, when describing the present invention, the expression "inside" refers to the inner center direction of the container or a portion in the direction thereof, and the expression "outside" refers to the direction opposite to the inside or a portion in the direction thereof.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

According to the couple container 10 of the present invention, as shown in FIG. 1 , a polyethylene terephthalate (PET) bottle is manufactured by blow molding, wherein the blow molding is completed by placing a parison having an opening (screw portion) and called a preform formed by an injection molding machine into a mold of a desired shape, heating it at a preset temperature, and then blowing in compressed air.

Furthermore, the couple container 10 is designed with the opening on the upper side to prevent the contents from flowing out when the bottle cap 14 is opened.

In the couple container 10 produced by blow molding as described above, when at least one of the plurality of side surfaces is used as the reference plane F, as shown in FIG. 2 , in the plane direction of the reference plane F, for example, A first support surface a protruding from the reference surface F by a predetermined height is formed on one side A, for example, on the left side of the side A, and is provided with a protruding surface PF. The protruding portion 16 has a protruding step relative to the reference plane F. Here, the up-down direction of the couple container 10 refers to the vertical direction from the bottom surface of the couple container 10 to the opening 12 . In addition, the transverse direction with respect to the up-down direction of the couple container 10 means the direction which is perpendicular to the up-down direction of the couple container 10.

In addition, on the other side B centered on the reference position CP, for example, on the right side of the side, a second support surface b is formed that is recessed by a predetermined height from the reference surface F, and a recessed portion 18 having a recessed surface CF is formed. The reference plane F has a concave step.

Here, it is preferable that the reference plane CP is located in the plane direction of the reference plane F, for example, at the center in the transverse direction with respect to the up-and-down direction of the couple container 10, and is formed continuously in the up-and-down direction of the couple container.

The reference position CP is located at the center of the side surface because, as described later, when the couple containers 10 having opposite shapes are combined with the reference position CP as the center, the edges of the two sides of the combined couple containers 10 will not be offset and will be well combined. On the other hand, the reference position CP is not limited to this and may not be located at the center of the side surface.

As shown in FIG. 2 , the protruding portion 16 has a form in which the end portion adjacent to the recessed portion 18 in the protruding surface PF protrudes toward the recessed portion 18 by a preset first interval d with reference to the reference position CP.

Furthermore, the recessed portion 18 has a form in which the end portion adjacent to the protruding portion 16 in the recessed surface CF is recessed and extended toward the protruding portion 16 by the second distance d′ with reference to the reference position CP.

Thus, when the reference plane F is viewed from the front, the protruding surface PF and the recessed surface CF are offset from each other by a first interval d and a second interval d' respectively extending from the reference position CP.

Here, preferably, the second interval d' has a shape that is more recessed than the first interval d (d<d'). This shape forms a formation condition of the buffer portion S, so that the two couple containers 10 facing each other are combined with each other in the horizontal direction.

Furthermore, preferably, the portion of the recessed portion 18 that is recessed and extended from the reference position CP toward the protruding portion 16 has a depth in the direction of side A and in the depth direction relative to the protruding portions 16 of the opposite couple containers 10 facing each other. , thereby forming a buffer portion S that forms a space with the protruding portion 16 of the opposite-side couple container 10 .

As a result, the interface BW connecting the end of the protruding surface PF facing the recessed portion 18 and the end of the recessed surface CF facing the protruding portion 16 forms a staggered angle with respect to the protruding surface PF and the recessed surface CF with the reference position CP as the center. Make the wrong angle within the acute angle range.

Furthermore, it is preferably designed so that with the reference plane F and the reference position CP as the boundary, the volume range of the recessed portion 18 is larger than the volume of the protruding portion 16 under the same conditions. When the protruding surface PF and the recessed surface CF are in contact, state is not loose, that is, within the preset interval range.

Preferably, the first support surface a and the second support surface b are within an angle range of a right angle greater than the acute angle formed by the boundary surface BW with respect to the protruding surface PF and the recessed surface CF. The direction of the acute angle formed by the first support surface a and the second support surface b may be in the opposite direction of the acute angle formed by the boundary surface BW with respect to the protruding surface PF and the recessed surface CF.

The reason why the angle between the first supporting surface a and the second supporting surface b is limited in this way is that when the first supporting surface a and the second supporting surface b are in contact, they are locked to each other through the boundary surface BW, so that when the facing couple containers 10 are combined, the protrusion 16 is prevented from being separated from the recessed portion 18 due to the force of separating in the vertical direction relative to the reference plane F.

That is, as shown in FIG. 3 c , this is because the recessed portion 18 has a shape in which the width in the depth direction is wide and the width in the opposite direction is narrow, making it difficult for a structure of the same form inside to escape from a narrow space.

In addition, the acute angle formed by the first supporting surface a and the second supporting surface b is formed to be greater than or equal to the acute angle formed by the boundary surface BW because when the mold is taken out from the mold described later, the pushing part receiving the elastic force of the elastic part is naturally operated by Removed while deforming.

As described above, the reference surface F, the first supporting surface a, the second supporting surface b, the protruding surface PF, the recessed surface CF and the boundary surface BW forming one side of the couple container 10 constitute a joint portion 20, and the joint portion 20 is continuously formed on the side of the couple container 10 in the up and down direction of the couple container 10.

That is, the structure of the coupling part 20 is such that the couplings between the facing couple containers 10 made by blow molding are coupled or released by mutual sliding movement in the up and down direction. It is difficult to couple and uncouple in other directions.

Furthermore, preferably, as shown in FIG. 6 , a locking protrusion 22 or a locking groove 24 is formed on the middle portion of the interface BW in the up-down direction toward the protruding surface PF of the recessed portion 18 based on the reference position CP. , the latching groove 24 or the latching protrusion 22 respectively corresponding to the latching protrusion 22 or the latching groove 24 is formed at the portion facing the recessed surface CF of the protrusion 16 based on the reference position CP.

That is, as shown in FIG. 6 , these locking protrusions 22 and the locking grooves 24 are formed in parallel on the boundary surface BW of the same height of the couple container 10. When the couple containers 10 are combined, the locking protrusion 22 of the couple container 10 is inserted into the locking groove 24 of the couple container 10 on the other side, thereby arranging the couple containers 10 in parallel at the same height.

Furthermore, in order to couple or uncouple the facing couple containers 10 in the vertical direction, these locking protrusions 22 and the locking grooves 24 slide and move against a force greater than a preset force acting on the couple containers 10 in the vertical direction. At this time, it is preferable that the protruding portion 16 protruding toward the opposite side couple container 10 with reference to the reference position CP with respect to the space formed by the buffer portion S is bent and deformed, and at the same time is restored to its original shape by an elastic action. The interface BW performance has a tight feeling.

Furthermore, a plurality of the locking protrusions 22 and the locking grooves 24 may be formed on the interface BW toward the up and down direction of the couple container 10 .

Furthermore, as shown in FIG. 6 , the protrusion 16 may further form a deformation guide groove 26 , which is recessed from the protrusion surface PF at a middle portion in the transverse direction relative to the up-down direction of the couple container 10 , and is recessed toward the protrusion surface PF. The couple container 10 is formed to be extended in the up-and-down direction. In addition, the recessed portion 18 is further formed with a deformation guide protrusion 28 that protrudes from the recessed surface CF and extends in the up-down direction of the couple container 10 .

It is confirmed from Figures 3a to 3c and Figure 6 that the deformation guide groove 26 is used when combining the couple container 10 made by blow molding. In addition to the up and down sliding method, it can also be combined with each other in the horizontal direction. .

First, referring to Fig. 3a, the front portion of the protruding portion 16 is formed wider than the entrance of the recessed portion 18 at the corresponding position of the reference plane F. Therefore, the facing protruding portions 16 and the protruding portions 16 are slightly offset from each other. docking.

Figure 3b shows that when the couple container 10 on the upper side is in a stationary state in Figure 3a, the couple container 10 on the lower side receives a force in the direction of arrow F1, or when the couple container 10 on the upper side moves slowly in the direction of arrow F2. , the deformation relationship of the protruding portions 16 that are close to each other is caused when a facing force is applied to the couple container 10 while the couple container 10 located on the lower side moves in the direction of the arrow F3 faster than the arrow F2.

As shown in FIG. 3 b , through the above-mentioned effect, the portion of each protruding portion 16 located in the direction of the reference position CP based on the deformation guide groove 26 is centered on the deformation guide groove 26 by the angle of the contact interface BW. Deformation in the direction of arrows f1, f1`, this deformation continues until the moment when the position of the first support surface a exceeds the boundary position of the second support surface b, that is, until the couple containers 10 move 1/2 interval (d``) between each other .

At this time, the buffer portion S secures its space so as not to be disturbed by the deformation of the protruding portion 16 aligned with the deformation guide groove 26 .

Furthermore, as shown in FIG. 3 c , the facing couple containers 10 have deformation guide protrusions 28 in a shape protruding from the recessed surface CF in the recessed portion 18 corresponding to the deformation guide groove 26 .

Here, the function of the deformation guide protrusion 28 formed in the recessed portion 18 is opposite to the function of the deformation guide groove 26 formed in the protruding portion 16, and is used to move the coupled couple container 10 toward the horizontal direction, for example, toward the relative container 10 When unfolding horizontally in the up and down direction, the first supporting surface a and the second supporting surface b are kept in contact.

Although the deformation guide groove 26 and the deformation guide protrusion 28 are not shown in the figure, they may be formed on the protruding surface PF and the concave surface CF in opposite phases, that is, the deformation guide protrusion 28 is formed on the protruding surface PF, and the deformation guide groove is formed on the concave surface CF. 26.

From this, it can be predicted that the above-mentioned deformation guide groove 26 and the deformation guide protrusion 28 formed in opposite phases can perform the same deformation guide groove 26 and deformation as shown in FIGS. 3a to 3c . The guide protrusions 28 have the same category of functions.

The deformation guide grooves 26 and the deformation guide protrusions 28 are formed in this manner because of the process of injecting beverages into each of the blow-molded couple containers 10 and the injecting of drinks into the blow-molded couple containers. 10. Automatically combine and separate containers during the process of combining and supplying.

That is, coupling the couple container 10 only in the up-and-down direction is unreasonable in that there is a delay due to space and coupling in the manufacturing process including beverage injection, and it is difficult to manufacture equipment for coupling.

Therefore, as mentioned above, the horizontal direction is combined to facilitate the injection of beverages and subsequent processes.

On the one hand, Figures 4a to 4c are used to illustrate the manufacturing process of the couple container 10 made by blow molding, which process will be described below.

First, Figure 4a shows a state in which the parison is placed inside before assembling the mold.

At this time, the sliding core for forming the interface surface BW and the buffer portion S is in a state of retreating to a position without interference in the molding position of the couple container 10 prepared by blow molding.

Figure 4b shows a state in which after the molds are assembled, the push part at the contact point between the molds is pushed by the elastic force of the elasticity part to move the sliding core to the molding position. In this state, Air pressure is injected into the parison to complete the molding process through the mold and sliding core.

Figure 4c shows the state in which the couple container 10 made by blow molding is manufactured through the cooling process after molding. If the mold is opened, the pushing part is first moved to the original position by the elastic part and the sliding core is retracted to the molding position. And moves to the position where the locking effect on the couple container 10 made by blow molding is released.

At this time, the undercutting effect on the first supporting surface a and the second supporting surface b is preferably designed in an acute angle range, so that the operating force generated by the movement and displacement of the pushing part moved by the elastic part can be easily separated.

In addition, it is preferable that since an acute angle smaller than the acute angle formed by the first support surface a and the second support surface b is required, the sliding core is moved back further in response to the movement displacement of the pushing part moved by the elastic part. quick.

Furthermore, preferably, as shown in Figure 3a, the shape of the interface BW corresponds to the retreat speed and position of the sliding core and is formed into a waveform based on the reference position CP.

In addition, FIG. 5 is a modification of the couple container according to the present invention, showing a couple container with protruding portions and recessed portions respectively formed on four sides.

Thereby, a plurality of couple containers 10 can be combined in various forms.

According to the present invention, in a state where the containers having the same shape and manufactured by blow molding are arranged with their joint parts, they are inserted and connected or separated in a sliding manner. Since they are manufactured by a mold of a single shape, the manufacturing cost can be saved, and they can be selectively combined with other contents. Moreover, since they are of a single shape, it is easy to manage the containers. In addition, in the process of connecting or separating the containers, the shaking of the contents can be prevented when the opening of the container is opened, thereby reducing the spraying of the contents caused by shaking, and the bottle cap can be connected or separated by sliding one of the containers upward, thereby having the effect of easily opening and closing the bottle cap.

Although the present invention has been described above with reference to the drawings, it should be understood that those skilled in the art can implement it in other specific forms without changing the technical idea or essential features of the present invention. Therefore, the above-described embodiments are illustrative in all respects and do not limit the present invention.

Claims (5)

1. A couple container, which is in the shape of a container with an opening formed on the upper side, and includes a coupling portion on at least one datum plane in the side surface, with a datum provided in the transverse direction with respect to the up-down direction of the container. Based on the reference position, a protruding part with a protruding surface is formed on one side, and the protruding surface protrudes from the reference surface to form a step, and based on the reference position, a recessed part with a concave surface is formed on the other side, and the protruding surface protrudes from the reference surface to form a step. The recessed surface is recessed from the reference surface to form a step, and has an end of the protruding portion adjacent to the recessed portion protruding from the reference position toward the recessed portion by a preset first interval, and the protruding portion is The ends of the adjacent recessed portions are recessed toward the protruding portion from the reference position to extend a preset second spacing shape, connecting the end portions of the protruding portions facing the recessed portion and the protruding portions facing the recessed portion. The boundary surface of the end of the recessed part forms an acute angle with respect to the protruding part and the recessed part respectively with the reference position as the center, forming the shape of the reference surface and each part of the protruding part and the recessed part. It is formed continuously in the upper and lower directions of the container and is characterized by: The protruding portion is further formed with a deformation guide groove or a deformation guide protrusion. The deformation guide groove is formed to extend recessedly from the protruding surface toward the up and down direction at a middle portion transversely with respect to the up and down direction of the container. A protrusion is formed to protrude upward and downward from the recessed surface, and the recessed portion is further formed with a deformation guide protrusion or a deformation guide groove that is inserted into each other corresponding to the deformation guide grooves or deformation guide protrusions formed oppositely; When combining the couple containers, the up and down sliding method can be used to combine with each other in the horizontal direction. In the interface, the middle part of the container in the up and down direction faces the protruding surface of the recessed part based on the reference position. A locking protrusion or a locking groove is formed. Based on the reference position, a locking groove or locking protrusion corresponding to the locking protrusion or locking groove is formed toward the recessed surface of the protrusion. 2. The couple container according to claim 1, characterized in that the first supporting surface protrudes from the reference surface by a predetermined height to form the protruding portion and is recessed from the reference surface by a predetermined height to form the recessed portion. The second supporting surface is formed at an angle greater than the acute angle formed by the interface surface. 3. The couple container according to claim 2, characterized in that the first supporting surface and the second supporting surface form an acute angle in the opposite direction to the boundary surface relative to each of the protruding surface and the recessed surface. 4. The couple container according to claim 1, wherein the internal shape and volume of the recessed portion are determined by a shape and size greater than the outer shape of the relatively inserted protruding portion. 5. The couple container according to claim 1, characterized in that the lower side portion of the opening including the coupling portion is blow-molded as a whole within a predetermined thickness range.