Synthetic resin cap

Abstract

To provide a synthetic resin lid capable of suppressing damage to a bottle opening when repeatedly attaching a container lid to a bottle opening of the container.SOLUTION: A synthetic resin lid of the present invention includes: a top wall, a skirt wall that hangs down from a periphery of the top wall and fits into an outer peripheral surface of a bottle mouth, and an inner ring that hangs down from the top wall and can be in close contact with an inner peripheral surface of the bottle mouth, a pressable inner cylinder that extends continuously from the top wall on an inner peripheral side of the inner ring, and an annular movable plate that connects the inner cylinder and the inner peripheral surface of the inner ring, and is movable following a downward pressure of the inner cylinder, in which an outermost diameter L1 of the inner ring when unfitted with the container is smaller than an inner diameter L2 of the bottle mouth, and as the inner cylinder moves in an axial direction as it is fitted into the container, the annular movable plate is displaced and the outermost diameter L1 of the inner ring is expanded so as to come into close contact with the inner peripheral surface of the bottle mouth.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a synthetic resin lid for a container that is used in a liquid dispensing machine (also called a "water server" when the liquid is water) that has a cylindrical liquid inlet nozzle that extends vertically upward when placed in place. [Background technology]

[0002] A water server is known in which a container filled with a liquid such as drinking water is connected upside down and the liquid is dispensed from the container through a spout located at the bottom. The container connected to the water server is used in an upside-down state, for example, with a container lid (cap) attached to a cylindrical liquid inlet nozzle that extends vertically upward in a liquid dispenser, and the liquid in the container is supplied to the spout without leaking out of the liquid dispenser.

[0003] The containers described above are generally known as returnable containers, and after all of the contents have been poured out, they are separated and collected from the liquid dispenser. The collected containers are then washed, sterilized, etc., and refilled with liquid. The bottle openings are then sealed with new container lids and transported to the liquid dispenser for reuse. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-65697 [Patent Document 2] Japanese Patent Application Publication No. 2019-73340 Summary of the Invention [Problem to be solved by the invention]

[0005] As mentioned above, when containers intended to be reused as returnable containers are collected, the used container lid (cap) is removed from the bottle mouth and sterilized and cleaned, and then new liquid is filled in and a new container lid is attached to the bottle mouth. At this time, an inner ring (equivalent to, for example, the "cylindrical inner seal piece 16" in Patent Document 1) is provided on the container lid to fit into the bottle mouth, and this inner ring and the outer wall of the container lid fit into the bottle mouth of the container.

[0006] In this case, the upper end of the bottle mouth may be damaged during transport, cleaning, and other processes when the returnable container is reused. For example, in JP 2019-73340 A, when a bottle cap 1 is attached to a bottle with a damaged upper end of the cylindrical mouth 10 and an attempt is made to seal the inner surface of the cylindrical mouth 10 with the water-stopping rib 23a, the outer surface of the water-stopping rib 23a is attached while contacting the upper end of the cylindrical mouth 10. As a result, the outer surface of the water-stopping rib 23a may also be damaged, potentially impairing the sealing function of the container. When damage occurs to the upper end of the bottle mouth, it becomes difficult to seal the bottle mouth with the container lid, which may result in leakage of the contents.

[0007] As such, there is still room for improvement in the prior art, including the above-mentioned patent documents, and one example of an objective of the present invention is to provide a synthetic resin lid that can perform a sealing function even if the upper end of the bottle mouth is damaged due to repeated use of the container lid on the bottle mouth of the container. [Means for solving the problem]

[0008] In order to solve the above problems, one aspect of the present invention provides a synthetic resin lid: (1) a synthetic resin lid for a container having a cylindrical bottle mouth extending upward, the synthetic resin lid comprising: a top wall; a skirt wall that hangs down from the periphery of the top wall and fits into the outer circumferential surface of the bottle mouth; an inner ring that hangs down from the top wall on the inner circumferential side of the skirt wall and can be tightly fitted into the inner circumferential surface of the bottle mouth; a pressable inner tube that extends continuously from the top wall on the inner circumferential side of the inner ring; and an annular movable plate that connects the inner tube and the inner circumferential surface of the inner ring and moves in response to downward pressure of the inner tube, wherein an outermost diameter L1 of the inner ring when not fitted with the container is smaller than an inner diameter L2 of the bottle mouth, and the inner tube moves in the direction of the arrow L2 when fitted with the container. The synthetic resin lid passes through the center of the inner cylinder. By moving in the axial direction, the annular movable plate is displaced and the outermost diameter L1 of the inner ring expands so as to come into close contact with the inner surface of the bottle mouth.

[0009] In addition, in the synthetic resin lid described in (1) above, (2) it is preferable that the annular movable plate is an L-shaped cross-section member having a short side portion whose one end is connected to the inner tube and a long side portion whose one end is connected to the other end of the short side portion and whose other end is connected to the inner surface of the inner ring.

[0010] In the synthetic resin lid described in (2) above, (3) it is preferable that the thickness of the short side portion is greater than the thickness of the long side portion.

[0011] Furthermore, in the synthetic resin lid described in (2) or (3) above, (4) it is preferable that the long side portion is inclined upward in the axial direction so that the one end is located closer to the top wall than the other end when not engaged, and is inclined downward in the axial direction so that the other end is located closer to the top wall than the one end when engaged.

[0012] Furthermore, in the synthetic resin lid described in any of (2) to (4) above, (5) it is preferable that the other end of the long side portion is connected at a connection position that is a predetermined distance away from the lower end of the inner ring.

[0013] In the synthetic resin cap described in any of (1) to (5) above, (6) it is preferable that when the inner ring is capped and fitted into the container, it is in close contact with the inner wall of the bottle mouth at a distance from the upper end of the bottle mouth.

[0014] Furthermore, in the synthetic resin lid described in any of (1) to (6) above, (7) it is preferable that the inner tube is configured to include at least an outer wall portion to which the annular movable plate is connected, an inner wall portion arranged at a predetermined gap from the outer wall portion and having a separable sealing portion at its lower end, and a top wall portion connecting the outer wall portion and the inner wall portion.

[0015] Also, as mentioned above (7) In the synthetic resin lid described above, (8) it is preferable that the inner tube is supported via the annular movable plate so that the top wall portion protrudes from the ceiling wall when not engaged, and that when engaged, the top wall portion and the ceiling wall have the same height in the axial direction in response to the movement of the annular movable plate.

[0016] Furthermore, it is preferable that the synthetic resin lid described in any of (1) to (8) above has an opening portion on the inner peripheral surface of the inner tube, at least a portion of which can be detached via a weakened portion and through which the liquid contents stored in the container can be poured out.

[0017] Furthermore, the synthetic resin lid described in (9) above is preferably such that (10) the container is attached to a liquid dispenser equipped with a liquid inlet nozzle extending upward with the bottle mouth facing vertically downward, and the weakened portion is broken by the liquid inlet nozzle, opening the intended opening portion so that the liquid contents can be taken out. [Effects of the Invention]

[0018] With the synthetic resin lid of the present invention, even if the upper end of the bottle mouth of a repeatedly used container is scratched, the inner ring will avoid the scratch and will not affect the sealing function, making it possible to prevent leakage of the contents even when the container is used repeatedly. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is an external perspective view of a synthetic resin lid according to an embodiment. [Figure 2] FIG. 2 is a top view of the synthetic resin lid. [Figure 3] FIG. 2 is a bottom view of the synthetic resin lid. [Figure 4] 1A and 1B are a partial cross-sectional view and a side view of a synthetic resin lid as viewed from the side. [Figure 5] FIG. 2 is a perspective cross-sectional view of the synthetic resin lid. [Figure 6] FIG. 5 is an enlarged view of the portion α in FIG. [Figure 7] 1 is a partial cross-sectional view of a state in which the synthetic resin lid of the embodiment is attached to the bottle opening of a container. [Figure 8] FIG. 2 is a partial cross-sectional view of a container with a container lid attached to a bottle opening of the container, as viewed from an oblique angle. [Figure 9] FIG. 10 is a state transition diagram when a container lid having a conventional structure is attached to a bottle mouth of a container. [Figure 10] 10 is a state transition diagram when the container lid of the embodiment is attached to the bottle mouth of the container. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, preferred embodiments for carrying out the present invention will be described. In this embodiment, for the sake of convenience, the X, Y, and Z directions are appropriately set in the explanation using the drawings, but this is for the sake of convenience and does not excessively limit the present invention. Furthermore, for the configurations other than those described in detail below, known structures of containers and lids (caps) can be used as appropriate.

[0021] ≪Synthetic resin lid 100≫ The structure of a synthetic resin lid 100 serving as a container lid according to this embodiment will be described in detail with reference to FIGS. As shown in these figures, the synthetic resin lid 100 of this embodiment is attached to a bottle mouth 210 of a liquid container (hereinafter referred to as "container 200") that is attached to a liquid dispenser such as a water server described below. As an example, the synthetic resin lid 100 of this embodiment may be in a form that is capped so as to fit onto the bottle mouth 210 of the container 200.

[0022] As shown in these figures, the synthetic resin lid 100 is fitted to a container 200 having a cylindrical bottle mouth 210 extending upward by means of a stopper, and is composed of a top wall 10, a skirt wall 20, an inner ring 30, an inner tube 40, and an annular movable plate 50. The material of the synthetic resin lid 100 is not particularly limited, and examples thereof include known synthetic resins such as polyethylene and polypropylene.

[0023] As shown in Figure 1, the top wall 10 is a circular portion that supports an inner tube 40 having an outlet for pouring out the contents stored in the container 200 and an annular movable plate 50 that supports the inner tube 40 so that it can move in the axial direction.

[0024] The skirt wall 20 is configured to have an annular protrusion 21 that hangs down from the periphery of the top wall 10 and fits into the outer peripheral surface of the bottle mouth 210. When the synthetic resin lid 100 is attached to the container 200, at least a portion of the outer peripheral surface of the bottle mouth 210 of the container 200 is covered by the skirt wall 20.

[0025] The inner ring 30 is configured to be located more inward than the skirt wall 20 and hang down from the top wall 10 so as to be able to come into close contact with the inner peripheral wall of the bottle mouth 210. As will be described later, the outermost diameter L1 of the inner ring 30 when not fitted with the container 200 is set to be smaller than the inner diameter L2 of the bottle mouth. This means that even if the upper end 210t of the bottle mouth 210 is scratched, the synthetic resin lid 100 will not be attached with the inner ring 30 in contact with the inner surface of the bottle mouth 210, preventing damage to the sealing function of the cap.

[0026] 2 and 3, the inner tube 40 extends continuously from the top wall 10 on the inner peripheral side of the inner ring 30. The inner tube 40 of this embodiment is configured to be able to be pressed in the axial direction of the synthetic resin lid 100 (a direction passing through the center of the inner tube 40 in FIG. 1 and parallel to the Z axis) via an annular movable plate 50, which will be described later.

[0027] As can be seen from Figures 4 and 5, the inner tube 40 is configured to include at least an outer wall portion 41 to which the annular movable plate 50 described later is connected, an inner wall portion 42 arranged at a predetermined gap from the outer wall portion 41 and having a separable sealing portion 43 at its lower end, and a top wall portion 44 connecting the outer wall portion 41 and the inner wall portion 42.

[0028] In this embodiment, the sealing portion 43 is connected to the inner wall portion 42 via a weakened portion WP. Examples of such weakened portion WP include various known breaking structures that can be broken by a predetermined pressure, such as a thinned and tearable score line.

[0029] As described above, when the synthetic resin lid 100 is attached to the bottle mouth 210 of the container 200, the weakened portion WP breaks and at least a part of the sealing portion 43 separates from the inner wall portion 42, thereby forming a pouring outlet for the contents. Therefore, the weakened portion WP in this embodiment functions as a planned opening portion that will break in the future to form an opening. In this manner, it is preferable that the inner peripheral surface of the inner cylinder 40 of this embodiment is provided with an intended opening portion, at least a portion of which is detachable via the weakened portion WP and through which the content liquid stored in the container 200 can be poured out.

[0030] The annular movable plate 50 has the function of connecting the inner tube 40 and the inner surface of the inner ring 30, and is configured to have the function of moving in response to the downward pressure of the inner tube 40. More specifically, the annular movable plate 50 of this embodiment may be an L-shaped cross-section member having a short side portion 51 having one end 51a connected to the inner tube 40, and a long side portion 52 having one end 52a connected to the other end 51b of this short side portion 51 and the other end 52b connected to the inner surface of the inner ring 30, as shown in Figures 4 to 6, etc.

[0031] Also, as shown in FIG. 6, the other end 51b of the short side portion 51 and one end 52a of the long side portion 52 correspond to substantially the same region of the L-shaped cross-section member, and together form the bent corner of the above-mentioned L-shaped cross-section member. 6, it is preferable that a recess dp1 of a desired depth is formed on the upper surface side of one end 51a of the short side portion 51, and a similar recess dp2 is also formed on the upper surface side of the other end 52b of the long side portion 52. This allows the annular movable plate 50 to move smoothly and in a defined manner when the inner cylinder 40 moves in the axial direction due to pressure from the user, as will be described later. In this embodiment, the recesses dp1 and dp2 are formed on the upper surface side of the short side portion 51 and the long side portion 52, respectively, but at least one of these may be formed on the lower surface side, or may be provided on both the upper and lower surfaces.

[0032] 6, it is preferable that the thickness t1 of the short side portion 51 of the annular movable plate 50 is thicker than the thickness t2 of the long side portion 52. This allows the short side portion 51 to reliably support the long side portion 52 when the inner tube 40 is pressed, and makes it possible to press the inner ring 30 against the inner circumferential surface 210i of the bottle mouth 210 and reliably form a sealing point.

[0033] In the annular movable plate 50 of this embodiment, the thickness t1 of the short side portion 51 is greater than the thickness t2 of the long side portion 52, but the present invention is not limited to this configuration. That is, for example, the thickness t1 of the short side portion 51 may be configured to be thinner than the thickness t2 of the long side portion 52. This makes it possible to prevent the long side portion 52 from unintentionally deforming and weakening the seal point between the inner ring 30 and the bottle mouth 210. Alternatively, the thickness t1 of the short side portion 51 and the thickness t2 of the long side portion 52 may be configured to be substantially the same thickness.

[0034] 3 to 5, reinforcing ribs 45 may be provided between the outer wall portion 41 and the inner wall portion 42 to suppress deformation of the outer wall portion 41 due to movement of the annular movable plate 50. Such reinforcing ribs 45 may be formed, for example, on the surface of the outer wall portion 41 facing the inner wall portion 42 so as to extend along the axial direction. Furthermore, the reinforcing ribs 45 may be formed on the surface of the inner wall portion 42 facing the outer wall portion 41, or may be formed as a plurality of reinforcing ribs discontinuously at predetermined intervals along the circumferential direction (θz).

[0035] Furthermore, the width of each of the reinforcing ribs 45 formed intermittently in the circumferential direction may be the same as that of the other reinforcing ribs 45 as shown in FIG. By providing the inner tube 40 with the reinforcing ribs 45 in this way, when a user, for example, presses the inner tube 40 axially toward the container, the annular movable plate 50 moves, but this movement of the annular movable plate 50 can be prevented from causing excessive deformation of the outer wall portion 41 toward the center.

[0036] <Synthetic resin container with lid> Next, with reference to FIGS. 7 and 8, a description will be given of the container 200 in a state where the synthetic resin lid 100 of this embodiment is attached to the bottle mouth 210. FIG. As can be understood by referring to these figures, the synthetic resin lid 100 of this embodiment is attached to the container 200 after it has been filled with contents such as drinking water.

[0037] Preferably, the synthetic resin lid 100 of this embodiment is a stopper-type cap, and a ring-shaped protrusion 21 is formed on the inner surface of the skirt wall 20 of the synthetic resin lid 100, and when attached as described above, it is preferable that the bottle mouth 210 climbs over this ring-shaped protrusion 21 so that the synthetic resin lid 100 fits into the bottle mouth 210. 7 and other figures, the container 200 in this embodiment has an upper end 210t that includes the top surface of the bottle mouth 210. As can be seen from the figure, the upper end 210t is configured to include the intersection of the inner circumferential surface 210i of the bottle mouth 210 and the above-mentioned top surface (i.e., the top corner of the bottle mouth).

[0038] As such, the container 200 of this embodiment is preferably attached to a known liquid dispenser (such as a water server) equipped with a liquid inlet nozzle extending upward with the bottle mouth 210 facing vertically downward, but the manner in which the container 200 is attached to the liquid dispenser is not particularly limited to the above. When a container 200 sealed with the synthetic resin lid 100 of this embodiment is attached to a liquid distributor, the weakened portion WP of the synthetic resin lid 100 described below may be broken by the liquid inlet nozzle of the liquid distributor, thereby opening the intended opening portion and making it possible to remove the liquid contents of the container 200.

[0039] Here, examples of the container 200 suitable for this embodiment include containers capable of storing various known liquids such as drinking water, and known resin materials such as polyethylene terephthalate (PET) resin can be used as the material. In this embodiment, drinking water is exemplified as the liquid stored in the container 200, but it does not necessarily have to be a liquid, and known solid materials such as medicines or food, or known semi-solid materials in a gel form may also be used.

[0040] <Attachment of a conventional synthetic resin lid to a container 200> Next, with reference to FIG. 9, a manner in which a conventional container lid 110 is attached to the container 200 will be described. As is clear from the figure, an inner ring 30' for fitting with the bottle mouth 210 of the container 200 hangs down from the top plate 10' inside the skirt wall 20' that hangs down from the periphery of the top plate 10' of the conventional container lid 110.

[0041] At this time, the outermost diameter L0 of the inner ring 30' from the center of the container lid 110 is set larger than the inner diameter L2 of the bottle mouth 210 (L0>L2) so that the inner ring 30' can be reliably fitted tightly against the inner wall of the bottle mouth 210. Therefore, as shown in Figure 9, when the container lid 110 is fitted to the bottle mouth 210 of the container 200 by plugging or the like, the upper end 210t of the bottle mouth 210 first comes into contact with the inner ring 30'.

[0042] Then, the container lid 110 is pushed down onto the bottle mouth 210, causing the inner ring 30' to bend slightly inward and slide against the upper end 210t of the bottle mouth 210, until the container lid 110 finally fits into the bottle mouth 210. In a container lid 110 equipped with such a conventional inner ring structure (in other words, a structure where L2 > L0), if there is a scratch on the upper end 210t of the bottle mouth 210 of the container 200, there is a concern that when the container lid 110 is fitted, the outer portion of the inner ring 30' will slide against the upper end 210t of the bottle mouth 210, causing damage. Such concerns become more pronounced when the container 200 is used in a liquid dispenser (such as a water server) that is intended to be reused as a returnable bottle.

[0043] <Attachment of the synthetic resin lid 100 of this embodiment to the container 200> Next, FIG. 10 shows how the synthetic resin lid 100 of this embodiment is attached to the container 200. 10, before being fitted to the bottle mouth 210 of the container 200 (i.e., when not fitted), the synthetic resin lid 100 is supported via the annular movable plate 50 so that the top wall portion 44 of the inner tube 40 protrudes from the top wall 10. More specifically, as shown in FIG. 10(a), when not fitted, the long side portion 52 of the annular movable plate 50 is inclined with respect to the axial direction (Z direction) so that the one end 52a is positioned closer to the top wall 10 than the other end 52b (this inclination of the long side portion 52 is referred to as "upward inclination").

[0044] At this time, the outermost diameter L1 of the inner ring 30 of the synthetic resin lid 100 when not fitted is set smaller than the inner diameter L2 of the bottle mouth 210 of the container 200 described above (L2>L1). 10(a) and (b), when fitting the synthetic resin lid 100 to the bottle mouth 210 of the container 200, the synthetic resin lid 100 is first attached to the bottle mouth 210 with the top wall portion 44 of the inner cylinder 40 protruding from the ceiling wall 10. At this time, due to the above-mentioned relationship of L2>L1, the inner ring 30 does not slide against the upper end portion 210t of the bottle mouth 210 when the synthetic resin lid 100 is attached to the bottle mouth 210.

[0045] 10(c) and (d), with the synthetic resin lid 100 attached to the bottle mouth 210, the inner tube 40 is pressed axially downward (in the minus Z direction) toward the bottom of the bottle mouth 210. Then, the annular movable plate 50 rotates in response to the descent of the inner tube 40, and the long side portions 52 of the annular movable plate 50 press the inner ring 30 radially outward to spread it apart, while the short side portions 51 pivot to come into close contact with the outer wall portion 41 of the inner tube 40.

[0046] As the inner tube 40 moves axially as it fits into the container 200, the annular movable plate 50 is displaced, and the outermost diameter L1 of the inner ring 30 expands so that it comes into close contact with the inner circumferential surface 210i of the bottle mouth 210 (i.e., L1 > L2). In this embodiment, the short side 51 comes into close contact with the outer wall 41 of the inner tube 40 in parallel with this expanding movement, so that the long side 52 can support the force pushing the inner ring 30 apart. As a result, a seal point is formed between the outer part of the inner ring 30 and the inner circumferential wall of the bottle mouth 210, and the synthetic resin lid 100 is fitted into the bottle mouth 210 of the container 200.

[0047] As shown in Figure 10(d), at this time, when the synthetic resin lid 100 is fitted into the bottle mouth 210, the long side portion 52 of the annular movable plate 50 is inclined toward the axial direction so that the other end 52b is positioned closer to the top wall 10 than the one end 52a (the inclination of the long side portion 52 in this orientation is referred to as a "downward inclination"). In this manner, the long side portion 52 of the annular movable plate 50 in this embodiment is displaced so as to be inclined in the opposite directions (the above-mentioned upward inclination and downward inclination) when the plates are disengaged and engaged.

[0048] 6 and 10(d), the other end 52b of the long side portion 52 of the annular movable plate 50 is connected at a connection position 30x that is a predetermined distance L3 away from the lower end 30z of the inner ring 30. As a result, the connection position 30x of the inner ring 30 is pressed radially outward by the long side portion 52, and the portion including the area around the connection position 30x and extending axially downward to 30z comes into close contact with the inner circumferential wall of the bottle mouth 210, forming the seal point.

[0049] In this way, the inner ring 30 of the synthetic resin lid 100 in this embodiment is in close contact with the inner peripheral wall of the bottle mouth 210 at a distance from the upper end 210t of the bottle mouth 210 (i.e., below in the axial direction) when the synthetic resin lid 100 is stoppered and fitted onto the container 200. This makes it possible to form the above-mentioned seal point without any problems, even if, for example, a conventional container lid 110 has been used unintentionally in the past and the upper end 210t of the bottle mouth 210 has been damaged.

[0050] 10(d), the inner cylinder 40 of the synthetic resin lid 100 in this embodiment follows the movement of the annular movable plate 50 during the aforementioned fitting process, so that the axial heights (positions in the Z direction) of the top wall portion 44 and the ceiling wall 10 are the same. In this way, the top wall portion 44 of the inner cylinder 40 and the ceiling wall 10 are substantially flush with each other, which makes it possible to improve the ease of mounting the container 200 equipped with the synthetic resin lid 100 to the liquid distributor.

[0051] The above-described embodiment is merely an example, and various modifications are possible without departing from the spirit of the present application. For example, in the above-described embodiment, the synthetic resin lid 100 is fitted to the bottle mouth 210 of the container 200 by stoppering, but the synthetic resin lid 100 may be attached to the container 200 by applying a known screw structure.

[0052] In the above embodiment, the inner tube 40 of the synthetic resin lid 100 has a double-wall structure composed of an outer wall portion 41 and an inner wall portion 42 with a predetermined gap in the circumferential direction. However, the present invention is not limited to the above embodiment, and the inner tube 40 may have a single-wall structure in which the outer wall portion 41 and the inner wall portion 42 are integrated. In such a case, a sealing portion 43 is provided at the lower end of the inner tube 40 via a weakened portion WP. [Industrial Applicability]

[0053] The present invention is suitable for realizing a synthetic resin lid that can prevent damage to the bottle mouth when the container lid is repeatedly attached to the bottle mouth of a container. [Explanation of symbols]

[0054] 100 Synthetic resin lid 10 Top wall 20 Skirt Wall 30 Inner Ring 40 Inner cylinder 50 Annular movable plate 200 containers 210 Bottle Mouth

Claims

1. A synthetic resin lid for a container having an upwardly extending cylindrical bottle mouth, The ceiling wall and a skirt wall that hangs down from the periphery of the top wall and fits onto the outer circumferential surface of the bottle mouth; an inner ring that is located on the inner circumferential side of the skirt wall and hangs down from the top wall so as to be able to come into close contact with the inner circumferential surface of the bottle mouth; a pressable inner cylinder extending continuously from the top wall on the inner circumferential side of the inner ring; an annular movable plate that connects the inner cylinder and the inner peripheral surface of the inner ring and that moves in response to downward pressure of the inner cylinder, The outermost diameter L1 of the inner ring when not fitted with the container is smaller than the inner diameter L2 of the bottle mouth, As the inner tube moves in the axial direction of the synthetic resin lid, which passes through the center of the inner tube, as the inner tube is fitted with the container, the annular movable plate is displaced, and the outermost diameter L1 of the inner ring expands so as to come into close contact with the inner peripheral surface of the bottle mouth. A synthetic resin lid characterized by:

2. the annular movable plate is an L-shaped cross-section member having a short side portion whose one end is connected to the inner cylinder, and a long side portion whose one end is connected to the other end of the short side portion and whose other end is connected to the inner peripheral surface of the inner ring; The synthetic resin lid according to claim 1.

3. The thickness of the short side portion is greater than the thickness of the long side portion. The synthetic resin lid according to claim 2.

4. The long side portion is When the connector is not fitted, the connector is inclined upward with respect to the axial direction so that the one end is positioned closer to the top wall than the other end, When the two ends are fitted together, the other end is inclined downward with respect to the axial direction so as to be positioned closer to the top wall than the one end. The synthetic resin lid according to claim 2 or 3.

5. The other end of the long side portion is connected at a connection position a predetermined distance away from the lower end of the inner ring. The synthetic resin lid according to any one of claims 2 to 4.

6. When the bottle is capped and fitted to the container, the inner ring is in close contact with the inner peripheral wall of the bottle mouth at a distance from the upper end of the bottle mouth. The synthetic resin lid according to any one of claims 1 to 5.

7. The inner cylinder is an outer wall portion to which the annular movable plate is connected; an inner wall portion disposed at a predetermined gap from the outer wall portion and having a separable sealing member at a lower end; and a top wall portion connecting the outer wall portion and the inner wall portion. The stopper type synthetic resin lid according to any one of claims 1 to 6.

8. The inner cylinder is When the engagement is not performed, the top wall portion is supported via the annular movable plate so as to protrude from the top wall, When the annular movable plate is fitted to the top wall, the top wall and the ceiling wall have the same height in the axial direction in accordance with the movement of the annular movable plate. The capping type synthetic resin closure according to claim 7.

9. An opening portion is provided on the inner peripheral surface of the inner cylinder, at least a part of which is detachable via a weakened portion and through which the content liquid stored in the container can be poured out. The synthetic resin lid according to any one of claims 1 to 8.

10. The container comprises: The bottle mouth is attached to a liquid dispenser having a liquid inlet nozzle extending upward with the bottle mouth facing vertically downward, and the weakened portion is broken by the liquid inlet nozzle to open the intended opening portion, thereby making it possible to take out the liquid content. The synthetic resin lid according to claim 9.

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