JP6783114B2 - Note cap - Google Patents

Description

The present invention relates to a pouring cap having a spout for the contents, a cap body attached to the mouth of the container, and a check valve for opening and closing the spout.

For example, in a container that houses various contents such as food seasonings such as dressings, it is common to attach a pouring cap having a spout for pouring the contents to the mouth of the container. is there. In addition, many such pouring caps have been put on the market in which the opening area of the pouring outlet is made relatively large so that the contents can be poured only by tilting the container.

With a pouring cap having such a wide-mouthed spout, there is a problem that it is difficult to pour out the contents to the target place because the contents may be pouring out while the container is tilted. In addition, the amount of the contents to be poured varies greatly depending on the inclination of the container, and the contents may continue to be poured even while the tilted container is being returned, so that the amount of the contents may be more than intended.

On the other hand, Patent Document 1 discloses an injection cap having a check valve for opening and closing the injection port. According to such a dispensing cap, the check valve opens by pressing the container to increase the internal pressure, so that the contents are not dispensed while the container is tilted, and the contents are poured to the target location. It has the advantage of being easy to put out. Further, since the check valve closes when the pressing of the container is stopped, it becomes easy to inject the contents in an intended amount.

Japanese Unexamined Patent Publication No. 2011-23840

Such a check valve generally has a check valve body serving as a base and a valve body locally connected to the inner peripheral surface of the check valve body via a narrow connecting portion. Therefore, the valve body is configured to swing starting from the connecting portion. By the way, such a conventional check valve does not pose a problem in normal usage, but if chopsticks or the like are inserted into the spout and the valve body is pierced, the connecting part is damaged and the check valve is used. There is a risk that it will not function.

An object of the present invention is to solve such a problem, and the check valve is less likely to be damaged even if an unintended external force is applied to the valve body of the check valve, and the function of the check valve can be maintained. The purpose is to provide a dispensing cap.

The present invention has a spout that leads to the inside of the container and closes the cap body and the spout that are attached to the mouth of the container, while releasing the spout by increasing pressure in the container. A pouring cap with a check valve for pouring out the contents of the container.
The cap body has a peripheral wall that extends vertically and has the spout inside.
The check valve has a valve body provided inside the peripheral wall and extending in the horizontal direction.
The valve body is swung as a starting point said edges in accordance with a pressure change in the container and having an edge portion connected to the inner peripheral surface of the peripheral wall over its entire area extending linearly Note It is a cap.
Further, the present invention has a spout that leads to the inside of the container and closes the cap body attached to the mouth of the container and the spout, while releasing the spout by increasing the pressure in the container. An injection cap provided with a check valve for injecting the contents of the container.
The check valve has an edge that extends linearly and is directly or indirectly supported by the cap body over the entire area, and starts from the edge in response to a pressure change in the container. Equipped with a valve body that swings as
The check valve has a check valve body that communicates with the spout and is held by the cap body, and the edge portion is also a pouring cap that connects to the inner peripheral surface of the check valve body. ..

Further, it is preferable to have a lid body connected to the cap body via a hinge, and the edge portion is located on the side where the hinge is provided.

The cap body is composed of a lower cap body attached to the mouth portion and an upper cap body having the spout and connecting to the lower cap body via a second hinge. While closing the mouth portion, it has a closed wall in which an injection opening is formed by tearing along the groove to be broken, and a pull ring which is connected to the closed wall via a support and controls the tearing of the closed wall. Is preferable.

In the injection cap of the present invention, the edge portion serving as the swing starting point of the valve body extends linearly and is directly or indirectly supported by the cap body over the entire area thereof. That is, since the length of the portion that cantileverly supports the valve body becomes long, damage is less likely to occur even when an unintended external force is applied to the valve body, and the function of the check valve can be maintained.

It is sectional drawing in the side view which shows the 1st Embodiment of the pouring cap according to this invention in the state of being attached to the mouth part of a container. FIG. 1A shows a state at the time of molding of the injection cap shown in FIG. 1, FIG. 1A is a plan view, FIG. 1B is a sectional view taken from a side view, and FIG. 1C is a bottom view. It is sectional drawing in the side view which shows the 2nd Embodiment of the pouring cap according to this invention in the state of being attached to the mouth part of a container. FIG. 3A shows a state of the injection cap shown in FIG. 3 at the time of molding, FIG. 3A is a plan view, FIG. 3B is a sectional view taken from a side view, and FIG. 3C is a bottom view. It is sectional drawing in the side view which shows the 3rd Embodiment of the pouring cap according to this invention in the state of being attached to the mouth part of a container. It is sectional drawing in the side view which shows the state at the time of molding of the pouring cap shown in FIG. FIG. 5A is a plan view and FIG. 5B is a bottom view showing a state of the injection cap shown in FIG. 5 at the time of molding. Regarding the check valve shown in FIG. 5, (a) is a plan view, (b) is a cross-sectional view in a side view, and (c) is a bottom view.

Hereinafter, the first embodiment of the injection cap according to the present invention will be described with reference to FIGS. 1 and 2. In the present specification and the like, the terms "upper" and "lower" refer to the orientation of the container in an upright position as shown in FIGS. 1, 3, and 5. Further, the front is the side provided with the finger hook portion described later (left side of FIGS. 1, 3 and 5), and the rear is the side provided with the hinge connecting the cap body and the lid body described later (FIG. 1, FIG. 3 and 5 on the right side).

The dispensing cap A of the present embodiment is composed of a cap body 1, a check valve 2, and a lid 3, and is used by being attached to a bottle-shaped container P. The cap body 1, the check valve 2, and the lid 3 of the present embodiment are made of synthetic resin and are molded in a state of being integrally connected as shown in FIG. 2 (b).

The cap body 1 includes a cap body peripheral wall 1a that surrounds the cylindrical mouth portion P1 included in the container P. The inner peripheral surface of the peripheral wall 1a of the cap body is provided with a claw portion 1b that engages with a protrusion P2 protruding from the outer peripheral surface of the mouth portion P1 and can be attached to the container P by tapping. As a configuration for mounting the cap body 1 on the container P, a screw may be adopted.

A cap body top wall 1c that covers the upper part of the mouth portion P1 is integrally connected to the upper end of the cap body peripheral wall 1a. Further, on the lower surface of the edge portion of the top wall 1c of the cap body, a seal wall 1d that is in liquid-tight contact with the inner peripheral surface of the mouth portion P1 is provided.

At the center of the top wall 1c of the cap body, as shown in FIG. 2C, the front wall 1e1 is arcuate and the rear wall 1e2 is straight, forming a D-shape as a whole, as shown in FIG. A peripheral wall 1e is provided. Inside the peripheral wall 1e, a spout 1f leading to the inside of the container P is formed.

Further, on the upper surface of the top wall 1c of the cap body at the center, 1 g of a pouring cylinder having a cylindrical shape and having an upper end curved outward to form a lip is provided. Further, a claw-shaped fitting portion 1h for detachably holding the lid 3 is provided on the upper surface of the edge portion of the top wall 1c of the cap body.

The check valve 2 is provided with a plate-shaped valve body 2a having an outer diameter slightly smaller than that of the spout 1f inside the peripheral wall 1e. As shown in FIG. 2C, the valve body 2a has a shape as if a disk-shaped front portion and a rectangular rear portion are combined in a bottom view, and the edge portion of the linear rear portion. 2a1 is integrally connected to the inner peripheral surface of the rear wall 1e2 over the entire area. As a result, the valve body 2a is directly supported by the cap body 1 and can swing up and down with the edge portion 2a1 as the starting point.

The lid 3 has an outer shape that is continuous with the peripheral wall 1a of the cap body and includes a peripheral wall 3a of the lid that engages with the fitting portion 1h. A lid top wall 3b is integrally connected to the upper end of the lid peripheral wall 3a. A seal cylinder 3c that comes into contact with the inner peripheral surface of the injection cylinder 1g is provided at the center of the lower surface of the lid top wall 3b.

A hinge H1 that is integrally connected to the peripheral wall 1a of the cap body is provided behind the peripheral wall 3a of the lid body, and the lid body 3 is swingably held by the cap body 1. Further, in front of the lid peripheral wall 3a, a finger hook portion 3d extending outward in the radial direction is provided.

In order to eject the contents from the ejection cap A having such a form, the lid 3 is opened by using the finger hook 3d, and the container P is tilted so that the opened lid 3 is located above. , Press the body of the container P. As a result, the internal pressure of the container P increases, the valve body 2a swings from the edge 2a1 to release the spout 1f, and the contents of the pressurized container P pass through the spout 1f to the peripheral wall 1e and the injection. It flows inside the dispenser 1 g and is dispensed from the tip of the dispenser 1 g. In this way, the valve body 2a that closed the spout 1f releases the spout 1f by pressing the container P, so that it becomes difficult for the contents to be poured out while the container P is tilted. It becomes easy to dispense to the place. Further, when the pressing on the container P is stopped, the internal pressure of the container P returns to the original value and the injection port 1f is closed again, so that the contents can be injected in the intended amount.

Further, since the edge portion 2a1 in the valve body 2a of the present embodiment is located on the side (rear side) where the hinge H1 is provided, when the lid 3 is opened and the container P is tilted to eject the contents. The edge 2a1 will be located above. Therefore, when the valve body 2a swings in this state, the lower part of the inclined spout 1f opens wide, so that the contents pass under the inclined spout 1f and as it is below the inclined peripheral wall 1e and the injection cylinder 1g. It will flow along the inner peripheral surface. That is, since the contents flow from the pouring outlet 1f into the peripheral wall 1e and the pouring cylinder 1g without having a head, there is an advantage that liquid splashing due to the turbulence of the flow is less likely to occur.

The edge portion 2a1 of the valve body 2a extends linearly and is integrally connected to the inner peripheral surface of the rear wall 1e2 over the entire area, and the length of the portion that cantilever supports the valve body 2a is It is longer than the conventional check valve. Therefore, even if chopsticks or the like are inserted from the pouring cylinder 1 g and an unintended external force is applied to the valve body 2a, damage is less likely to occur, and the function of the check valve 2 can be maintained.

Next, a second embodiment of the injection cap according to the present invention will be described with reference to FIGS. 3 and 4. The dispensing cap B of the present embodiment is composed of a cap body 4, a check valve 5, and a lid 6, and is used by being attached to a bottle-shaped container Q. The cap body 4, the check valve 5, and the lid 6 of the present embodiment are also made of synthetic resin as in the case of the first embodiment described above. Further, these are molded in a state of being integrally connected as shown in FIG. 4 (b).

The cap body 4 includes a cap body peripheral wall 4a that surrounds the mouth portion Q1 of the container Q, and includes a claw portion 4b that engages with a protrusion Q2 provided on the mouth portion Q1. The cap body 4 may be attached to the container Q with screws.

A cap body top wall 4c that covers the upper part of the mouth portion Q1 is integrally connected to the upper end of the cap body peripheral wall 4a, and a liquid is formed on the inner peripheral surface of the mouth portion Q1 on the lower surface of the edge portion of the cap body top wall 4c. A seal wall 4d that is in close contact is provided.

At the center of the top wall 4c of the cap body, a connecting wall 4e that extends vertically upward and then tilts inward in the radial direction is provided, and at the upper end of the connecting wall 4e, downward. The extending peripheral walls 4f are integrally connected. The upper part of the peripheral wall 4f is cylindrical as shown in FIG. 4A, and the lower part is arcuate in front wall 4f1 and linear in rear wall 4f2 in bottom view as shown in FIG. 4C. As a whole, it has a D shape. Further, inside the peripheral wall 4f, a spout 4g leading to the inside of the container Q is formed.

As shown in FIG. 3, an aluminum sheet S for keeping the inside of the container Q airtight when not in use is fixed to the upper end of the peripheral wall 4f.

Further, a claw-shaped fitting portion 4h for detachably holding the lid 6 is provided on the upper surface of the edge portion of the top wall 4c of the cap body.

The check valve 5 is provided with a plate-shaped valve body 5a having an outer diameter slightly smaller than that of the spout 4g inside the lower portion of the peripheral wall 4f. As shown in FIG. 4C, the valve body 5a has a shape as if a disk-shaped front portion and a rectangular rear portion are combined in a bottom view, and the edge portion of the linear rear portion. 5a1 is integrally connected to the inner peripheral surface of the rear wall 4f2 over the entire area. As a result, the valve body 5a is directly supported by the cap body 4 and can swing up and down with the edge portion 5a1 as the starting point.

The lid 6 has an outer shape that is continuous with the peripheral wall 4a of the cap body and includes a peripheral wall 6a of the lid that engages with the fitting portion 4h. A lid top wall 6b is integrally connected to the upper end of the lid peripheral wall 6a. Further, on the lower surface of the lid top wall 6b, an inner seal cylinder 6c is provided which is located above the peripheral wall 4f and holds the aluminum sheet S between the lid 6 and the peripheral wall 4f when the lid 6 is closed. An outer seal cylinder 6d that comes into contact with the outer peripheral surface of the connecting wall 4e is provided on the radial outer side of the 6c.

Behind the lid peripheral wall 6a, a hinge H2 that is integrally connected to the cap main body peripheral wall 4a is provided. Further, in front of the lid peripheral wall 6a, a finger hook portion 6e extending outward in the radial direction is provided.

In order to dispense the contents from the dispensing cap B of the present embodiment, the lid 6 is opened by using the finger hook 6e, and the opened lid 6 is located above after the aluminum sheet S is peeled off. The container Q may be tilted to press the body of the container Q. As a result, the internal pressure of the container Q increases, and the valve body 5a that has closed the spout 4g swings from the edge 5a1, so that the contents are poured out from the peripheral wall 4f through the released spout 4g. As described above, since the valve body 5a of the present embodiment operates in the same manner as that of the above-described embodiment, the same effect as that of the previously described embodiment can be obtained in this embodiment as well.

The injection cap of the present invention can also be realized by the embodiment (third embodiment) shown in FIGS. 5 to 8. The dispensing cap C of the present embodiment is composed of a lower cap body 7 and an upper cap body 8, a check valve 9, and a lid 10 constituting the cap body, and is mounted on the container P described in the first embodiment. Is used. The lower cap body 7, the upper cap body 8, and the lid 10 of the present embodiment are made of synthetic resin, and as shown in FIGS. 6 and 7, the lower cap body 7, the upper cap body 8, and the lid 10 are in this order. It is molded in a state of being integrally connected in series. The check valve 9 may be formed of the same material as the lower cap body 7, but may use a different type of material. The check valve 9 of the present embodiment is made of a relatively soft material such as rubber, elastomer, low density polyethylene (LDPE), or linear low density polyethylene (LLDPE).

The lower cap body 7 includes a lower cap body inner peripheral wall 7a that surrounds the mouth portion P1 of the container P, and includes a claw portion 7b that engages with a protrusion P2 provided on the mouth portion P1. A lower cap body outer peripheral wall 7c is provided on the radial outer side of the lower cap body inner peripheral wall 7a, and the lower cap body inner peripheral wall 7a and the lower cap body outer peripheral wall 7c are shown in FIGS. 7 (a) and 7 (b). It is intermittently connected by the connecting piece 7d shown.

Further, the lower cap body 7 is provided with a sealing wall 7e provided inside the mouth portion P1 to close the mouth portion P1. The closed wall 7e of the present embodiment has a bottomed tubular shape and has a flange extending outward in the radial direction at the upper end, and the outer edge of the flange is integrally integrated with the upper end of the inner peripheral wall 7a of the lower cap body. It is connected. Further, the inner edge of the flange is provided with an injection cylinder (second injection cylinder) 7f extending upward and whose tip is curved outward in the radial direction, and the second injection cylinder 7f is provided in the radial direction. On the outside, 7 g of a claw-shaped fitting portion (second fitting portion) that holds the upper cap main body 8 detachably is provided. Further, the closed wall 7e is provided with a groove 7h to be broken, which has a diamond shape in a plan view (bottom view) on the upper surface and the lower surface thereof, and further, on the upper surface of the closed wall 7e, a support column 7j is provided inside the groove 7h to be broken. A pull ring 7k is provided at the upper end of the support column 7j.

The upper cap main body 8 includes an upper cap main body peripheral wall 8a connected to the lower cap main body outer peripheral wall 7c. The top wall 8b of the upper cap body is integrally connected to the upper end of the peripheral wall 8a of the upper cap body. On the lower surface of the upper cap body top wall 8b, on the radial inside of the upper cap body peripheral wall 8a, a claw portion 8c that engages with the second fitting portion 7g is intermittent in the circumferential direction as shown in FIG. 7A. It is provided in a shape. Further, an annular seal cylinder (second seal cylinder) 8d that abuts on the inner peripheral surface of the second injection cylinder 7f is provided inside the claw portion 8c in the radial direction. On the upper surface of the top wall 8b of the upper cap body, a claw-shaped fitting portion (first fitting portion) 8e for holding the lid 10 detachably is provided directly above the claw portion 8c. Further, an inner peripheral wall 8f extending upward is provided inside the first fitting portion 8e in the radial direction. As shown in FIG. 7A, the inner peripheral wall 8f is formed in a D shape (the side close to the lid 10 is straight and the side close to the lower cap body 7 is curved) when viewed from the bottom. Then, as shown in FIG. 5, the upper end of the inner peripheral wall 8f is connected to the inner peripheral wall 8f via a flange extending inward in the radial direction, and the upper end thereof is curved outward to form a lip. A cylindrical injection cylinder (first injection cylinder) of 8 g is provided.

Then, as shown in FIG. 5, between the lower cap main body 7 and the upper cap main body 8, a hinge (second hinge) H3 provided in the front is formed between the lower cap main body outer peripheral wall 7c and the upper cap main body peripheral wall 8a. They are connected together. As a result, the upper cap body 8 can swing with respect to the lower cap body 7.

As shown in FIG. 8A, the check valve 9 includes a check valve main body 9a that is D-shaped in a plan view. As shown in FIG. 5, the check valve main body 9a is fitted and held on the inner peripheral surface of the inner peripheral wall 8f, and the front wall 9a1 located in the front in the fitted and held state is provided in an arc shape. , The rear wall 9a2 located at the rear is provided in a straight line. Further, inside the check valve main body 9a, a spout 9b and a plate-shaped valve body 9c having an outer diameter slightly smaller than that of the spout 9b are provided. As shown in FIG. 8C, the valve body 9c has a shape as if a disk-shaped front portion and a rectangular rear portion are combined in a bottom view, and the edge portion of the linear rear portion. The 9c1 is integrally connected to the inner peripheral surface of the rear wall 9a2 over the entire area. As a result, the valve body 9c is indirectly supported by the upper cap body 8 via the check valve body 9a, and can swing up and down with the edge portion 9c1 as the starting point.

As shown in FIG. 5, the lid body 10 includes a lid body peripheral wall 10a that is located above the upper cap body 8 and engages with the first fitting portion 8e. A lid top wall 10b is integrally connected to the upper end of the lid peripheral wall 10a. A seal cylinder (first seal cylinder) 10c that abuts on the inner peripheral surface of the first injection cylinder 8g is provided at the center of the lower surface of the lid top wall 10b, and is radially outside the first seal cylinder 10c. Is provided with a lid annular wall 10d that abuts on the upper surface of the flange that connects the inner peripheral wall 8f and the first injection cylinder 8g.

Behind the lid peripheral wall 10a, a hinge (first hinge) H4 that is integrally connected to the upper cap main body peripheral wall 8a is provided, and the lid 10 is swingably held by the upper cap main body 8. .. Further, in front of the lid peripheral wall 10a, a finger hook portion 10e extending outward in the radial direction is provided.

In the dispensing cap C of the present embodiment, since the mouth portion P1 of the container P is closed by the sealing wall 7e, it is possible to prevent quality deterioration of the contents when not in use. Then, when the contents are poured out, the upper cap body 8 is opened with respect to the lower cap body 7, and the sealing wall 7e is torn off along the planned break groove 7h by hooking a finger on the pull ring 7k and pulling it upward. Therefore, it is possible to form a pouring opening through which the contents pass inside the groove 7h to be broken. Since the pouring opening formed inside the planned fracture groove 7h has a wide opening, if a large amount of the contents are to be pouring out, the container P may be tilted with the upper cap main body 8 open. On the other hand, when it is desired to pour the contents to the target place, the upper cap body 8 may be closed, the lid 10 may be opened, the container P may be tilted, and the body may be pressed. In this case, since the content passes through the check valve 9, the same effect as that of the above-described embodiment can be obtained.

As described above, the dispensing cap C of the present embodiment can dispense the contents by two methods, while the lower cap body 7, the upper cap body 8 and the lid 10 are integrally connected, so that the number of parts is increased. Can be suppressed. Further, since the lower cap main body 7 and the like and the check valve 9 are separate members, the optimum material satisfying each function can be selected.

The injection cap according to the present invention is not limited to the embodiments described so far, and may be modified in various ways within the scope of the claims, or may have other configurations added. .. Further, the configurations between the above-described embodiments may be mutually replaced. For example, the check valve 9 of the third embodiment may be integrally connected to the lower cap body 7 or the like, or the check valve 2 integrally connected to the cap body 1 may be provided as a separate member. .. Further, in the above-described embodiment, the lid body 3 and the like are integrally connected to the cap body 1 and the like by the hinge H1 and the like, but they are provided separately from the cap body 1 and the like and are attached by screws or undercuts. May be good.

1: Cap body 1a: Cap body peripheral wall 1b: Claw part 1c: Cap body top wall 1d: Seal wall 1e: Circumferential wall 1e1: Front wall 1e2: Rear wall 1f: Outlet 1g: Outlet cylinder 1h: Fitting part 2: Check valve 2a: Valve body 2a1: Edge part 3: Lid body 3a: Lid body peripheral wall 3b: Lid body top wall 3c: Seal cylinder 3d: Finger hook part 4: Cap body 4a: Cap body peripheral wall 4b: Claw part 4c: Cap Main body top wall 4d: Seal wall 4e: Connecting wall 4f: Peripheral wall 4f1: Front wall 4f2: Rear wall 4g: Spout 4h: Fitting part 5: Check valve 5a: Valve body 5a 1: Edge part 6: Lid body 6a: Lid peripheral wall 6b: Lid top wall 6c: Inner seal cylinder 6d: Outer seal cylinder 6e: Finger hook 7: Lower cap body 7a: Lower cap body Inner peripheral wall 7b: Claw 7c: Lower cap body outer peripheral wall 7d: Connecting piece 7e: Sealed wall 7f: Second injection cylinder (injection cylinder)
7g: 2nd fitting part (fitting part)
7h: Groove to be broken 7j: Strut 7k: Pull ring 8: Upper cap body 8a: Upper cap body peripheral wall 8b: Upper cap body top wall 8c: Claw 8d: Second seal cylinder (seal cylinder)
8e: First fitting portion (fitting portion)
8f: Inner peripheral wall 8g: 1st injection cylinder (injection cylinder)
9: Check valve 9a: Check valve body 9a1: Front wall 9a2: Rear wall 9b: Outlet 9c: Valve body 9c1: Edge 10: Lid body 10a: Lid body peripheral wall 10b: Lid body top wall 10c: First Seal tube (seal tube)
10d: Lid ring wall 10e: Finger hook A: Dispensing cap B: Dispensing cap C: Dispensing cap H1: Hinge H2: Hinge H3: Second hinge (hinge)
H4: 1st hinge (hinge)
P: Container P1: Mouth P2: Protrusion Q: Container Q1: Mouth Q2: Protrusion S: Aluminum sheet

Claims (4)

The contents of the container are provided with a spout leading to the inside of the container, and the cap body attached to the mouth of the container and the spout are closed, while the spout is released by the pressure increase in the container. A dispensing cap with a check valve to dispense
The cap body has a peripheral wall that extends vertically and has the spout inside.
The check valve has a valve body provided inside the peripheral wall and extending in the horizontal direction.
The valve body has an edge portion extending linearly and connecting to the inner peripheral surface of the peripheral wall over the entire area, and swings from the edge portion in response to a pressure change in the container . Injection cap. The contents of the container are provided with a spout leading to the inside of the container, and the cap body attached to the mouth of the container and the spout are closed, while the spout is released by the pressure increase in the container. A dispensing cap with a check valve to dispense
The check valve has an edge that extends linearly and is directly or indirectly supported by the cap body over the entire area, and starts from the edge in response to a pressure change in the container. Equipped with a valve body that swings as
The check valve has a check valve body that communicates with the spout and is held by the cap body, and the edge portion is a pouring cap that connects to the inner peripheral surface of the check valve body. The injection cap according to claim 1 or 2 , further comprising a lid that is connected to the cap body via a hinge, the edge of which is located on the side where the hinge is provided. The cap body is composed of a lower cap body attached to the mouth portion and an upper cap body having the spout and connecting to the lower cap body via a second hinge. While closing the mouth portion, it has a closed wall in which an injection opening is formed by tearing along the groove to be broken, and a pull ring which is connected to the closed wall via a support and controls the tearing of the closed wall. The pouring cap according to any one of claims 1 to 3 .

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