JPH11342950A - Plastic bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic bottle which is a shrinkable container with a container body capable of being protected while it is easy to reduce a volume wherein the plastic bottle comprises a cylindrical side wall connected to an outer periphery of a bottom of the bottle and a pouring port which is formed to be smaller in diameter than the side wall for injecting/discharging contents which can be filled in a space surrounded by the bottom and the side wall with its periphery connected to the side wall. SOLUTION: The plastic bottle includes a container body 1 with a side wall 2 made of a highly flexible synthetic resin material and a cylindrical body 6 for surrounding an outer periphery of the side wall 2 so that the container body 1 can be protected. The cylindrical body 6 comprises a plurality of cylindrical members 7 which fit with one another while they can vertically stretch, a locking means 10 for limiting release of the cylindrical members 7 from a fitting state while the cylindrical body 6 is being stretched is provided between the inner and outer cylindrical members 7 which fit with each other, and an upper end of the cylindrical member 7 which is positioned at the highest while the cylindrical body 6 is vertically stretched is designed to be capable of being fixed to an outer peripheral rim 4a of a pouring port 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a bottle having a bottom portion,
A cylindrical side wall connected to the outer periphery of the bottom portion, and a container formed to have a smaller diameter than the side wall portion and configured to be capable of filling and discharging a chargeable space into a space surrounded by the bottom portion and the side wall portion. With respect to a plastic bottle having an outlet and an outer peripheral portion formed of a spout connected to the side wall,
The present invention relates to a plastic bottle configured to reduce the space during transportation or disposal by making the container itself compact in a state where the contents are not contained.

[0002]

2. Description of the Related Art Conventionally, as a container whose volume can be reduced, as shown in FIG. 8, for example, the whole is made of a thin material made of a flexible synthetic resin, and a side wall portion 2 is formed in a substantially cylindrical shape. There is a container, such as laundry glue, having a shape similar to a tube in which a bottom portion 3 having a gore in a folded state is formed inside the side wall portion 2 and is provided with an opening 5A for pushing out the contents.

In the glue container, when the contents are filled in the internal space C, the side wall portion 2 becomes cylindrical, so that the mouth portion 5A faces upward at the edge of the bottom portion 3. Can stand alone in posture. In the empty state, since the whole is flexible, it becomes flat except for the mouth 5A, and the volume can be reduced.

[0004]

However, in the above-mentioned conventional container which can be reduced in volume, since the entire container is formed of a material having high flexibility, the container can be deformed during transportation, so that it is compact. Although they can be packed, they may be easily cut off when they come into contact with hard foreign matter, and there is a problem that a protective means is always required for transportation. In addition, when the number of stored items is small, it is not easy to maintain the shape, it is difficult to stand by itself, and there is a problem that the area required for storing the contents is increased.

Therefore, an object of the plastic bottle according to the present invention is to provide a shrinkable container which has a flexible container body and is capable of protecting the container body while easily reducing the volume. is there.

[0006]

Means for Solving the Problems The characteristic structure of the plastic bottle according to the first aspect of the present invention will be described with reference to the example shown in FIG. A container body 1 made of a synthetic resin material and a tubular body 6 surrounding the outer periphery of the side wall portion 2 and capable of protecting the container body 1 are provided. A plurality of tubular members 7 fitted to each other, and between the fitted inner and outer tubular members 7, each of which is detached from the fitted state while the tubular body 6 is extended. And the uppermost tubular member 7 with the tubular body 6 extended vertically.
Is characterized in that the upper end portion is configured to be freely fixed to the outer peripheral edge 4a of the spout 4 (first characteristic configuration). That is, in the illustrated example, each cylindrical member 7 is made of a polyester resin, and the outer peripheral surface is formed as a tapered surface having a small diameter in the lower part, so that the inner diameter of the upper end is slightly smaller than the outer diameter of the lower end. It is. Each of the cylindrical members 7 fitted to each other is formed such that the inner diameter of the lower end of the cylindrical member 7 on the outer fitting side is slightly smaller than the outer diameter of the upper end of the cylindrical member 7 fitted on the inner side. It is. Due to the relationship between the inner and outer diameters, the inner tubular member 7 and the outer tubular member 7 are mutually locked in a state where the tubular body 6 is extended. Furthermore, each cylindrical member 7 is formed in a similar shape, and each dimension (however, meat) is set so that the similar ratio of the outer cylindrical member 7 to the inner cylindrical member 7 becomes substantially equal to each other. Thickness is the same). The innermost cylindrical member 7 is formed with a bottom, and the outermost cylindrical member 7 has an upper end formed on the outer peripheral edge 4a of the spout 4 made of polyester resin. Screwed and fixed. The container main body 1 is formed of a polyethylene film, and its upper end edge is airtightly attached to the inner surface of the spout 4.

The characteristic structure of the plastic bottle of the present invention according to claim 2 will be described with reference to the example shown in FIG.
The inner wall surface 8 and the outer wall surface 9 of each of the cylindrical members 7 in the first characteristic configuration are both tapered surfaces that increase in diameter upward, and the outer diameter of the upper end of the cylindrical member 7 to be fitted inside is reduced. The upper end of the outer wall 9 of the tubular member 7 to be fitted inside the tubular member 7 is made larger than the inner diameter of the lower end of the tubular member 7 fitted to the tubular member 7. (The second characteristic configuration).

The characteristic structure of the plastic bottle of the present invention according to claim 3 will be described with reference to the example shown in FIG.
The inner wall surface 8 and the outer wall surface 9 of each of the cylindrical members 7 in the first characteristic configuration are both tapered surfaces that increase in diameter downward, and the outer diameter of the lower end of the cylindrical member 7 that is fitted inside is reduced. The lower end of the outer wall surface 9 of the tubular member 7 to be fitted inside is made larger than the inner diameter of the upper end of the tubular member 7 fitted to the tubular member 7, and the tubular member 7 fitted to the outer And the upper end of the inner wall surface 8 constitutes the locking means 10 (a third characteristic configuration).

The characteristic structure of the plastic bottle of the present invention according to claim 4 will be described with reference to the example shown in FIG.
Each of the tubular members 7 in the first characteristic configuration is formed in a straight cylindrical shape, and an inner locking portion 11 that protrudes radially outward is provided at an upper end portion of the tubular member 7 on the side to be fitted. At the same time, an outer locking portion 12 protruding radially inward is formed at a lower end portion of the cylindrical member 7 on the outer fitting side, and the inner locking portion 11 and the outer locking portion 12 are formed. And (4th characteristic configuration).

The characteristic structure of the plastic bottle of the present invention according to claim 5 will be described with reference to the example shown in FIG.
Each of the cylindrical members 7 in the first characteristic configuration is formed in a straight cylindrical shape, and an inner locking portion 11 protruding outward in the radial direction is formed at a lower end portion of the cylindrical member 7 on the inner fitting side. At the same time, an outer locking portion 12 protruding radially inward is formed at the upper end of the cylindrical member 7 on the outer fitting side, and the inner locking portion 11 and the outer locking portion 12 are formed. And (5th characteristic configuration).

The characteristic structure of the plastic bottle of the present invention according to claim 6 will be described with reference to the example shown in FIG.
Each of the cylindrical members 7 in the first characteristic configuration is formed in a straight cylindrical shape, and a spiral groove 13 is formed in the inner wall surface 8 of the cylindrical member 7 on the outer fitting side, and the inner fitting is performed. On the outer wall surface 9 of the cylindrical member 7 on the side, a convex portion 14 that fits into the spiral groove portion 13 is formed, and the groove portion 13 and the convex portion 14 constitute the locking means 10 (the first). (6 features).

The characteristic structure of the plastic bottle of the present invention according to claim 7 will be described with reference to the example shown in FIG. 6. Engaging means 15 which can fix the locked state by the locking means 10 between the cylindrical member 7 and the cylindrical member 7 fitted externally.
(Seventh characteristic configuration).

According to an eighth aspect of the present invention, the plastic bottle of the present invention will be described with reference to the example shown in FIG. Body bottom 1 of container body 1
6 is formed of a hard material, and can be locked to the bottom outer peripheral portion 16a of the main body bottom portion 16 at the lower end inner peripheral portion 7a of the tubular member 7 located at the lowermost position in a state where the tubular body 6 is extended. This is the point that the bottom locking means 10 is provided (eighth feature configuration).

According to a ninth aspect of the present invention, the plastic bottle of the present invention will be described with reference to the example shown in FIG. The ninth characteristic configuration is that the cylindrical member 7 located at the lowermost part in the state of being formed is formed with a bottom.

[Functions and Effects of the Characteristic Configuration]
According to the first characteristic configuration of the plastic bottle according to the invention described in the above, the container body is always protected even if the container body is formed of a flexible material, while the plastic bottle is easily expandable and contractable up and down. . Moreover, the volume can be greatly reduced in the most reduced state, and the flexible container body can be protected during transportation. That is, according to the example shown in FIG. 1, the cylindrical members 7 fitted inside and outside can move relative to each other up and down.
While the cylindrical body 6 composed of
Since the locking means 10 for restricting the cylindrical body 6 from being disengaged from the fitted state in the extended state is configured, the state in which the cylindrical members 7 are mutually locked by the locking means 10 is provided. In this case, since the cylindrical body 6 having a predetermined vertical height is formed, when the spout 4 is fixed to the uppermost cylindrical member 7 at the outer peripheral edge 4a, these members are connected to each other. If the locking state by the stopping means 10 is maintained, the plastic bottle becomes self-supporting. And since the container main body 1 is always surrounded by the said cylindrical body 6, the said container main body 1 has the side wall part 2 formed with the synthetic resin which is rich in flexibility,
There is no risk of foreign matter coming in from the side. In addition, unless an external force in the extension direction is applied, the lower end of each tubular member 7 is located at the lowest position, so that the volume can be sufficiently reduced. Further, in the illustrated example, the container body 1 is completely protected by the spout 4 on the upper side and by the tubular body 6 on the side and the lower side irrespective of the presence or absence of the stored material, and as shown in FIG. In addition, if the injection port 5 is sealed, even if the cylindrical members 7 are not completely engaged with each other, the presence of the contents in the container body 1 allows the plastic bottle to have a height corresponding to the presence of the contents. Can stand alone.

According to the second aspect of the plastic bottle according to the second aspect of the present invention, the plastic bottle is held at a height corresponding to the amount of the stored items while exhibiting the operational effects of the first aspect. Becomes possible. That is, according to the example illustrated in FIG. 1, the cylindrical members 7 fitted to each other are
The upper end of the outer wall surface 9 of the inner fitting side and the lower end of the inner wall surface 8 of the outer fitting side are engaged with each other. In this state, if the upper end of the uppermost tubular member 7 is fixed to the outer peripheral edge 4a of the spout 4, the internally fitted tubular member 7 comes off the outer fitted tubular member 7. There is no. Therefore, it is possible to always maintain the cylindrical member 7 in a relatively fitted state.

According to the third aspect of the plastic bottle according to the third aspect of the present invention, the plastic bottle can be held at a height corresponding to the amount of the stored items while exhibiting the operational effects of the first aspect. And become independent. That is, according to the example shown in FIG.
The cylindrical members 7 fitted to each other are locked between the lower end of the outer wall surface 9 of the inner fitting side and the upper end of the inner wall surface 8 of the outer fitting side. In this manner, when the cylindrical members 7 are fitted to each other, the diameter becomes larger toward the lower side, so that the plastic bottle can be stably self-supported.

According to the fourth aspect of the plastic bottle according to the fourth aspect of the present invention, the plastic bottle is held at a height corresponding to the amount of the stored items while exhibiting the operational effects of the first aspect. It becomes possible, and moreover, it becomes possible to stably stand alone. That is, according to the example shown in FIG. 4, in the operation and effect of the first characteristic configuration, the outer locking portion 12 of the outer fitting cylindrical member 7 and the inner locking cylindrical member 7 The distance between the outer wall surface 9 and the cylindrical member 6 does not change regardless of the degree of expansion and contraction of the cylindrical body 6. Since the distance between the cylindrical body 6 and the inner wall surface 8 does not change, the plastic bottle can be made to stand in a stable state with respect to the expansion and contraction of the tubular body 6.

According to the fifth aspect of the plastic bottle according to the fifth aspect of the present invention, the plastic bottle is held at a height corresponding to the amount of the contents while exhibiting the operational effects of the first aspect. Can be achieved, and moreover, it can be made more stable and independent. In other words, according to the example shown in FIG. 5, in the operation and effect of the first characteristic configuration, the outer locking portion 12 of the outer fitting cylindrical member 7 and the inner fitting cylindrical member 7 The distance between the outer wall surface 9 and the cylindrical member 6 does not change regardless of the degree of expansion and contraction of the cylindrical body 6. Since the distance between the cylindrical body 6 and the inner wall surface 8 does not change, the plastic bottle can be made to stand in a stable state with respect to the expansion and contraction of the tubular body 6. Moreover, since the tubular member 7 on the outer fitting side is located below the tubular member 7 on the inner fitting side, the area of the lower end portion is increased in the self-standing position so that the stability is increased. Become. As shown in the figure, if the locking portions 11 and 12 are formed of a male screw and a female screw that can be screwed to each other, they can be easily engaged by screwing them together.

According to the sixth aspect of the plastic bottle according to the invention of the sixth aspect, it is possible to hold the plastic bottle at a desired height while exhibiting the operational effects of the first aspect. In addition, it is possible to become more stable and independent. That is, according to the example shown in FIG. 6, a spiral groove 13 is formed on the inner wall surface 8 of each tubular member 7, and the spiral groove 13 is formed on the outer wall surface 9 of the tubular member 7 fitted therein. Since the convex portion 14 that fits into the groove portion 13 is formed,
The convex portion 14 is guided by the groove portion 13 so that the cylindrical members 7 fitted to each other move up and down while relatively helically moving. Therefore, if the pitch of the spiral is reduced, it can be stopped even at the intermediate position. In addition, since the cylindrical members 7 to be fitted to each other are formed in a straight cylindrical shape, the shaft is relatively unlikely to be deviated, and is unlikely to be tilted in a self-standing state.

According to a seventh aspect of the plastic bottle according to the present invention, the first to sixth plastic bottles are provided.
In addition to the effects of the respective features of the present invention, it is possible to maintain the shape of the plastic bottle and stand alone. That is, according to the example shown in FIG. 6, the engaging groove 15 a extending in the circumferential direction is formed at the uppermost end of the spiral groove 13 formed on the inner wall surface 8 of the tubular member 7, When the cylindrical member 7 to be internally fitted and the cylindrical member 7 to be externally fitted are further rotated relative to each other in a locked state, the convex portion 14 enters the engagement groove portion 15a, so that no turning force is applied. As long as that state is maintained.

According to the eighth aspect of the plastic bottle according to the present invention, the first to seventh plastic bottles are provided.
In the above-mentioned advantages, the plastic bottle can be securely protected while the volume of the plastic bottle can be reduced by utilizing the elasticity of the container body. In other words, according to the example shown in FIG. 4, since the body bottom 16 of the container body 1 in which the side wall 2 is formed of a material having high flexibility is formed of a hard material, There is no danger of being damaged even if it comes into contact with the installation surface, and by locking the lower end inner peripheral portion 7a of the tubular member 7 to be located at the lowermost position, the side wall portion 2 formed of a material having high flexibility is formed. The side wall 2 can be reliably protected without impairing the elasticity, and the outer bottom of the tubular body 6 can be omitted.

According to the characteristic configuration of the plastic bottle according to the ninth aspect of the present invention, the function and effect of each of the first to seventh characteristic configurations are achieved, and further, the same as the eighth characteristic configuration is achieved. In addition, while the plastic bottle can be reduced in volume by utilizing the elasticity of the container body, the container body can be reliably protected. That is, according to the example shown in FIG. 1, since the tubular member 7 to be positioned at the lowermost portion is formed with the bottom, the container body 1 formed of a flexible material is surrounded. Since the cylindrical body 6 itself has a container shape having elasticity, the whole can be handled as a container.

Therefore, the container main body is protected while giving elasticity to the plastic bottle, and the plastic bottle can be reused.

As a result, the plastic bottle according to the present invention is a shrinkable container capable of protecting the container body.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a plastic bottle according to the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an example of a plastic bottle according to the present invention. In FIG. 1, (a) shows a state in which the side wall is contracted vertically, and (b) shows a state in which the side wall is extended vertically. FIG. 2 is a longitudinal sectional view for explaining a use state.

As shown in FIG. 1, the plastic bottle according to the present invention has a bottom portion 3 of a bottle, a cylindrical side wall portion 2 connected to an outer peripheral portion of the bottom portion 3, and a smaller diameter than the side wall portion 2. A filling / discharging port 5 for discharging / discharging the contents which can be filled into a space C formed and surrounded by the bottom portion 3 and the side wall portion 2, and an outer peripheral portion thereof is connected to the side wall portion 2; It comprises a spout 4. The container body 1 has the side wall portion 2 and the body bottom portion 16 formed of a polyethylene film, which is a synthetic resin material having high flexibility, and the upper end edge thereof is air-tightly bonded to the inner surface of the spout 4. is there. Also,
A cylindrical body 6 that can protect the container body 1 surrounding the outer periphery of the side wall portion 2 is provided, and the cylindrical body 6 is constituted by a plurality of cylindrical members 7 that fit together so as to be able to expand and contract vertically. I have. Each of the tubular members 7 is made of a polyester resin, is formed on a tapered surface whose outer peripheral surface is reduced in diameter downward, and the inner diameter of the upper end is slightly smaller than the outer diameter of the lower end. And
Each of the tubular members 7 fitted to each other is formed such that the inner diameter of the lower end of the tubular member 7 on the outer fitting side is slightly smaller than the outer diameter of the upper end of the tubular member 7 fitted on the inner side. . Thus,
The inner cylindrical member 7 cannot escape downward from the outer cylindrical member 7 and is fitted between the fitted inner and outer cylindrical members 7 in a state where the cylindrical body 6 is extended. The locking means 10 for restricting the disengagement from the device is constituted.

Further, each cylindrical member 7 is formed in a substantially similar shape, and each dimension is set so that the similar ratio of the outer cylindrical member 7 to the inner cylindrical member 7 becomes substantially equal to each other. (However, all thicknesses are almost the same). The innermost cylindrical member 7 is formed with a bottom, and the outermost cylindrical member 7 has an upper end formed on the outer peripheral edge 4a of the spout 4 made of polyester resin. Screwed and fixed. With this configuration, the container body 1 is completely protected by the spout 4 on the upper side and by the tubular body 6 on the sides and below regardless of the presence or absence of the contents. 2A and 2B, the container main body 1 can be kept in place even if the tubular members 7 are not completely engaged with each other, as shown in FIGS. Restricts shrinkage, and the plastic bottle becomes self-supporting at a height corresponding to the shrinkage.

The plastic bottle is assembled, for example, as follows. First, the container body 1 is formed by bonding the upper end of a polyethylene bag having an open top to the inside of a polyester spout 4 in which a spout 5 is formed. The main body 1 of the container body 1 is also made of polyethylene, which is a synthetic resin material having high flexibility. On the other hand, cylindrical members 7 having different diameters, each having a large diameter formed on the upper side, are sequentially superposed and arranged. Here, a cup-shaped container having multiple tapered walls is formed (that is, the outer bottom portion 17 is provided on the cylindrical member 7 having the smallest diameter). The spout 4
A male screw is screwed into the outer peripheral edge 4a of the cylindrical member 7 and a female screw is screwed into the uppermost portion of the inner wall surface 8 of the cylindrical member 7 having the largest diameter. By doing so, they are integrally formed. In this state, the lower part of the container body 1 is accommodated in the cylindrical member 7 having the minimum diameter.

When the contents are to be poured into the plastic bottle, the cylindrical body 6 is fully extended. When the inner cylindrical member 7 and the outer cylindrical member 7 are locked with each other and a little extension force is applied, the taper of the inner wall surface 8 and the outer wall surface 9 is formed with a small gradient. The locked state can be maintained. Thus, the function of the engaging means 15 is given to the locking means 10.

If the height of the plastic bottle is to be reduced accordingly when the amount of contents is reduced,
What is necessary is just to release the engagement-like body by applying a force in the up-down contraction direction to some of the locking means 10 (also serving as the engagement means 15) (see FIG. 2). Furthermore, when the plastic bottle is to be used up and the plastic bottle is to be disposed of, it is possible to greatly reduce the volume as a whole by compressing the plastic bottle vertically and returning it to the state at the time of the assembly (see FIG. 1A). ). The operation of this pressing and shrinking is extremely simple, and it is sufficient to simply press the spout 4 toward the bottom 3. The engaging means 1
5, the inner wall 8 below the tubular member 7 is engaged with the upper edge of the tubular member 7 by being rotated around the axis relative to the tubular member 7 fitted therein. Possible engagement projections may be provided.

Since the plastic bottle is constructed as described above, the plastic bottle can be transported in a small volume before assembling, and even after assembling, if the container does not contain any stored material, the height is reduced to reduce the volume. In addition, the container body 1 is completely flexible and the outer side is completely protected by the tubular body 6, so that the container body 1 can be filled and transported as a container.
While giving the container body 1 the freedom to move in the radial direction,
It is protected by a tubular body 6 to prevent the damage.

[Another Embodiment] <1> The cylindrical member 7 may be formed so as to expand in diameter downward (corresponding to the third characteristic configuration). For example, as shown in FIG. 3, the inner wall surface 8 and the outer wall surface 9 of each cylindrical member 7 are both tapered surfaces that increase in diameter downward, and the outer surface of the lower end of the cylindrical member 7 that fits inside is formed. The diameter may be larger than the inner diameter of the upper end of the tubular member 7 that is fitted to the tubular member 7. In this way, if the container main body 1 is formed in a cylindrical shape, a space is created around the bottom 16 of the main body, so that the heat insulating property is good. In particular,
If the lowermost tubular member 7 is formed with a bottom provided with the outer bottom 17 as shown in the figure, a strong plastic bottle is obtained as a whole, and the so-called good seat that spreads downward is obtained. Note that the lowermost tubular member 7 and the tubular member 7 fitted therein may be elastically deformed and pushed in, but the outer bottom portion 17 may be attached after the fitting combination. .

<2> The tubular member 7 may be formed in a straight tubular shape, and the locking means 10 may be provided between the tubular members 7 fitted to each other. For example, as shown in FIG. 4, a plurality of tubular members 7 may be sequentially fitted and arranged inside the outermost tubular member 7 attached to the outer peripheral edge 4 a of the spout 4. In the example, an outer locking portion 12 protruding inward is provided at the lower end of the inner wall surface 8 of the outer cylindrical member 7, and the outer locking portion 12 protrudes outward at the upper end of the outer wall 9 of the inner cylindrical member 7. An inner locking portion 11 is provided so that the locking portions 11 and 12 are mutually locked. In this case, as shown in the figure, a rigid main body bottom portion 16 (for example, made of vinyl chloride) is attached to the container main body 1 and is connected to the lower end inner peripheral portion 7a of the innermost cylindrical member 7 at the bottom outer peripheral portion 16a. The bottom locking means 10 which can be stopped may be provided so as to prevent the downward movement of the main body bottom 16. According to this structure, the side wall 2 of the container main body 1 is
Exposure to the outside can be prevented, and the outer bottom can be omitted. In addition, for example, as shown in FIG.
The inside and outside arrangement of the tubular member 7 may be reversed.
In the illustrated example, an outer locking portion 12 that protrudes inward is provided at a lower end portion of the inner wall surface 8 of the outer tubular member 7, and an outer locking portion 12 is provided at an upper end portion of the outer wall surface 9 of the inner tubular member 7. It is only necessary to provide an inner locking portion 11 that protrudes and locks the locking portions 11 and 12 with each other. As shown in the figure, if these locking portions 11 and 12 are formed of mutually threadable male screw threads and female screw threads, they can be screwed together as shown in FIG. Can be engaged with each other. In the illustrated example, the outermost cylindrical member 7
Is formed to have a bottom with an outer bottom portion 17 provided thereon. As described above, the main body bottom portion 16 having the hard bottom locking means 18 is provided on the container main body 1 and the outermost cylindrical member is provided. 7 may be configured to be locked to the inner peripheral portion at the lower end.

<3> As the locking means 10, for example, as shown in FIG. 6, a plurality of cylindrical members 7 formed in a straight cylindrical shape are fitted inside and outside and overlapped with each other, and the cylindrical member 7 on the side to be fitted outside is fitted.
A spiral groove portion 13 is formed on the inner wall surface 8 from the upper end to the lower end thereof, and a convex portion 14 which can be fitted into the groove portion 13 is formed on the outer wall surface 9 of the tubular member 7 on the side to be fitted. Thus, the tubular members 7 to be fitted may be configured to rotate relatively to each other so that the tubular body 6 expands and contracts (see FIG. 7). In the example shown in the figure, an engaging groove 15a extending in the circumferential direction is formed at the uppermost end of a spiral groove 13 formed on the inner wall surface 8 of the cylindrical member 7 as the engaging means 15, and the inner fitting cylinder is provided. When the convex portion 14 reaches the uppermost end of the groove portion 13 in a state in which the cylindrical member 7 and the cylindrical member 7 fitted to the outside are mutually locked, the convex portion 14 is further rotated relative to the cylindrical member 7 so that the convex portion 14 Since it enters the mating groove 15a, it is possible to maintain that state as long as no turning force is applied. Also, as shown in FIG. 7, if a groove is formed upward from the engagement groove 15a, the disassembly of the tubular body 6 is further facilitated.

<4> In the above embodiment, an example was described in which the container body 1 was formed of a polypropylene film. However, this is an example, and other materials having flexibility can be used. You may. For example, a polyethylene film, a polyvinyl chloride film, a nylon film and the like can be suitably used. In addition, although an example has been described in which the spout 4 and the cylindrical body 6 are made of a polyester resin, this is also an example, and the hardness or strength is such that the container body 1 having internal flexibility can be protected. Any of phenol resins, polystyrene resins, polycarbonate resins, polyethylene terephthalate (PET) resins and the like can be suitably used.

<5> In the above, in most of the embodiments, the example in which the outer bottom portion 17 is provided on the tubular body 6 has been described. The present invention also encompasses the construction of a plastic bottle (a container body 1 having a body bottom portion 16 is housed inside the tubular body 6) having an open portion.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a plastic bottle according to the present invention.

FIG. 2 is a longitudinal sectional view illustrating a use state of the plastic bottle shown in FIG.

FIG. 3 is a longitudinal sectional view showing another example of the plastic bottle according to the present invention.

FIG. 4 is a longitudinal sectional view showing another example of the plastic bottle according to the present invention.

FIG. 5 is a longitudinal sectional view showing another example of the plastic bottle according to the present invention.

FIG. 6 is a longitudinal sectional view showing another example of the plastic bottle according to the present invention.

FIG. 7 is a perspective view illustrating the configuration of the cylindrical body shown in FIG.

FIG. 8 is a longitudinal sectional view showing an example of a conventional plastic bottle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Side wall part 3 Bottom part 4 Spout part 4a Outer rim of spout part 5 Injection port 6 Cylindrical body 7 Cylindrical member 7a Lower end inner peripheral part of cylindrical member 8 Inner wall surface of cylindrical member 9 cylinder Outer wall surface of shaped member 10 Locking means 11 Inner locking part 12 Outer locking part 13 Groove part 14 Convex part 15 Engaging means 16 Main body bottom part 16a Bottom outer peripheral part 18 Bottom locking means

Claims (9)

[Claims] 1. A bottom portion of a bottle, a cylindrical side wall portion connected to an outer peripheral portion of the bottom portion, and a space formed smaller in diameter than the side wall portion and surrounded by the bottom portion and the side wall portion. A plastic bottle comprising a pouring port for pouring and discharging a refillable container and having an outer peripheral portion formed by a pouring port portion connected to the side wall portion, wherein the side wall portion has flexibility. A container body formed of an abundant synthetic resin material, and a tubular body surrounding the outer periphery of the side wall portion and capable of protecting the container body, wherein the tubular bodies are fitted to each other so as to be able to expand and contract vertically. It is composed of a plurality of tubular members,
In addition, between the inner and outer tubular members to be fitted, locking means for restricting detachment from the fitted state in a state where the tubular body is extended is configured, and the tubular body is A plastic bottle in which the upper end of a cylindrical member positioned at the top in a vertically extended state is freely fixed to an outer peripheral edge of the spout. 2. An inner wall surface and an outer wall surface of each of the cylindrical members are both tapered surfaces that increase in diameter upward, and an outer diameter of an upper end portion of the cylindrical member to be fitted is adjusted to the cylindrical shape. The plastic bottle according to claim 1, wherein the inner diameter of the lower end portion of the tubular member externally fitted to the member is larger than the inner diameter. 3. An inner wall surface and an outer wall surface of each of the cylindrical members are both tapered surfaces that expand in diameter downward, and the outer diameter of the lower end of the cylindrical member to be fitted is adjusted to the cylindrical shape. The plastic bottle according to claim 1, wherein the inner diameter of the cylindrical member is larger than the inner diameter of the upper end of the cylindrical member. 4. Each of the tubular members is formed in a straight cylindrical shape, and an inner locking portion is formed at an upper end portion of the tubular member on the inner fitting side to protrude radially outward. 2. The plastic bottle according to claim 1, wherein an outer locking portion protruding radially inward is formed at a lower end portion of the cylindrical member on the outer fitting side. 5. Each of the tubular members is formed in a straight cylindrical shape, and an inner locking portion is formed at a lower end portion of the tubular member on the inner fitting side to protrude radially outward. 2. The plastic bottle according to claim 1, wherein an outer locking portion protruding inward in the radial direction is formed at an upper end portion of the cylindrical member on the outer fitting side. 6. Each of the cylindrical members is formed in a right cylindrical shape, and a spiral groove is formed on an inner wall surface of the cylindrical member on the outer fitting side, and the cylindrical member on the inner fitting side is formed. 2. The plastic bottle according to claim 1, wherein a convex portion that fits into the spiral groove is formed on an outer wall surface of the member. 7. An engaging means which is capable of fixing a locked state by said locking means between a tubular member fitted inside and a tubular member fitted outside, respectively. 2. The plastic bottle according to item 1. 8. A bottom part of the container body is formed of a hard material, and a bottom outer peripheral part of the bottom part is connected to an inner peripheral part of a lower end of a cylindrical member located at a lowermost position in a state where the cylindrical body is extended. The plastic bottle according to any one of claims 1 to 7, further comprising a bottom locking means that can be stopped. 9. The plastic bottle according to any one of claims 1 to 7, wherein the lowermost tubular body in a state where the tubular body is extended is formed with a bottom.