JP2020196466A - Hinge cap - Google Patents

Abstract

To provide a hinge cap which can deal with a content fluid filled at a high temperature, which seals a container stably when closing a lid, and which can open a spout easily when opening the lid.SOLUTION: A hinge cap comprises: a cap body A mounted on a mouth part 1 of a container E; a lid body B mounted on the cap body A via a hinge C; and a plug D held in the lid body B. The cap body A includes: a base wall 4 for sealing an opening of the mouth part 1; a pour-out cylinder 5 standing from the periphery of a spout penetrating the base wall 4; and an engagement surface 4d formed at the base wall 4 outside of the pour-out cylinder 5. The plug D includes: a top wall 30; a close-contact cylinder 31 suspended from the top wall 30, for sealing the inner periphery of the pour-out cylinder 5; an engagement cylinder 32 suspended from an outer edge part of the top wall 30 and engaged with the engagement surface 4d; and a bend part 37 formed between the close-contact cylinder 31 and the engagement cylinder 32 of the top wall 30, and capable of coming into contact with the lid body B.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hinge cap attached to the mouth of a container, and more particularly to a hinge cap provided with a plug body.

Conventionally, in a hinge cap having a cap body attached to the mouth of the container and a lid body attached to the cap body via a hinge, a pull ring is provided at the planned opening portion of the cap body in order to ensure the airtightness of the container. A partition wall having a removing portion formed by the above was provided.
However, in order to open the removal part, it is necessary to remove the removal part by pulling a pull ring or the like after opening the lid, which is troublesome and difficult for a weak user to open. was there.

Therefore, a partition wall having a removing portion is not required, and the lid body holds the plug body that seals the pouring cylinder of the cap body, and the plug body is removed from the pouring cylinder together with the lid and opened at the same time as the lid is opened. Such a hinge cap has been conventionally known (see, for example, Patent Document 1).

JP-A-2017-154748

However, in the hinge cap described in Patent Document 1, when the spout of the hinge cap attached to the container filled with the high-temperature content liquid has a wide mouth, the surface area of the internal pressure received from the inside of the container after filling is large, so that the plug is formed by the pressure. There was a problem that the lid could be lifted and the lid could be opened.
For this reason, conventionally, the problem has been dealt with by increasing the fitting force between the plug body and the cap body, but increasing the fitting force causes a new problem that the force required for opening the lid increases.

An object of the present invention is to solve the above problem, and not only can the content liquid filled at a high temperature be dealt with, but also the adhesion between the cap body and the stopper body is released due to the impact at the time of tapping and dropping of the container. It is an object of the present invention to provide a hinge cap that can stably seal the inside of the container when the lid is closed and can easily open the spout when the lid is opened.

In order to solve the above problems, the present invention has a cap body attached to the mouth of a container as a hinge cap, a lid body attached to the cap body via a hinge, and a plug body held in the lid body. The hinge cap consists of a base wall that closes the opening of the mouth, a pouring cylinder that is erected from around the spout that penetrates the base wall, and a base on the outside of the pouring cylinder. With an engaging surface formed on the wall, the plug body is hung from the top wall, a close-fitting cylinder that is hung from the top wall and seals the inner circumference of the dispensing cylinder, and is hung from the outer edge of the top wall. A configuration is adopted in which an engaging cylinder that engages with the engaging surface and a bend portion that is formed between the close contact cylinder of the top wall and the engaging cylinder and that can come into contact with the lid are provided.

As a specific embodiment of the bend portion, a plurality of bend portions are formed at intervals in the circumferential direction of the top wall, and further, the bend portion is the outer periphery of the notch formed in the top wall. A configuration characterized in that it is formed from the side toward the upper side of the inner peripheral side, and further, the bend portion adopts a configuration characterized in that the upper surface is provided with a protrusion capable of contacting the lid.

As a specific embodiment of the engaging cylinder, the engaging cylinder adopts a configuration characterized in that an inner peripheral notch is formed on the inner peripheral side opposite to the hinge.
Further, as a specific embodiment of the lid body, the lid body is hung from the top wall, the side peripheral wall suspended from the peripheral edge of the top wall, and the lower surface of the top wall, and holds the plug body inward. The top wall is provided with a retaining cylinder, and the top wall is provided with a deformable thin-walled portion provided around the inside of the retaining cylinder.

By adopting the above configuration, the hinge cap of the present invention can be used even if a pressing force is applied to the lid due to an increase in the internal pressure inside the container due to a high temperature and an impact received at the time of tapping or dropping. The deformation of the bend prevents the plug from moving with respect to the cap body, and does not affect the close contact between the plug and the pouring cylinder of the cap body. It is possible to prevent the ejectors from being damaged by each other.

Further, the hinge cap of the present invention can maintain the sealing property between the injection cylinder and the close contact cylinder until the start of use by sandwiching the injection cylinder between the close contact cylinder and the engagement cylinder of the plug body, and also has a lid. Even if the fitting between the body and the cap body is not so large, the sealing property inside the container can be maintained, and in particular, it can be used as a heat-resistant hinge cap for a container filled with the content liquid at a high temperature.

In the explanatory view of the closed state of the hinge cap of this embodiment, (a) is a view taken along the line XX of (b), and (b) is a side sectional view. 1B is an enlarged view of a main part, FIG. 1A is an enlarged cross-sectional view at rest, and FIG. 1B is an enlarged cross-sectional view at impact. It is explanatory drawing of the hinge cap open state of this Example, (a) is a top view, (b) is a side sectional view. In the explanatory view of the hinge cap, (a) is a top view and (b) is a side sectional view. In the explanatory view of the plug body, (a) is a top view, (b) is a side sectional view, and (c) is a bottom view.

Next, the hinge cap of the present invention will be described with reference to the drawings showing the concrete examples.
In the following description, in FIG. 1B, the upward direction is referred to as "up" and the downward direction is referred to as "down".

In FIG. 1, A is a cap body mounted on the container E, B is a lid body that can be opened and closed on the cap body A via a hinge C, and D is a plug body mounted inside the lid body B.
The container E is a container having a mouth portion 1, and a fitting ridge 2 is provided on the outer peripheral surface of the mouth portion 1.
As the material of the plug body D, it is preferable to use a synthetic resin suitable for heat resistance such as polypropylene or hard polyethylene.

As shown in FIGS. 1, 3 and 4, the cap body A has a mounting portion 3 mounted on the mouth portion 1 of the container E and a mouth portion 1 extending inward from the upper end of the inner circumference of the mounting portion 3. It is provided with a base wall 4 that closes the opening of the base wall 4 and a pouring cylinder 5 that is erected from around the spout that penetrates the base wall 4.

The mounting portion 3 has an annular lid engaging portion 7 having a locking ridge 6 provided on the peripheral edge and engaging with the lid body B, and an inner cylinder 8 suspended from the inner peripheral edge of the lid engaging portion 7 to the lower surface. And an outer peripheral wall portion 9 vertically hung from the outer peripheral edge of the lid engaging portion 7.
The outer peripheral wall portion 9 is provided with an engaging protrusion 10 that engages with the fitting protrusion 2 of the mouth portion 1 of the container E at the lower part of the inner circumference.

In the present embodiment, the base wall 4 includes a lower wall portion 4a extending from the upper end of the inner circumference of the mounting portion 3, and an inclined portion 4b extending inwardly from the inner end of the lower wall portion 4a. A step is formed from the inner end of the inclined portion 4b to the upper wall portion 4c connected to the lower end of the outer circumference of the dispensing cylinder 5, and an engaging surface 4d is vertically formed on the outer edge of the inclined portion 4b to form a lower wall. An engaging recess 13 whose inner surface is continuous with the engaging surface 4d is provided on the inner edge of the upper surface of the portion 4a.
Further, a locking protrusion 14 is provided on the side peripheral surface of the engaging surface 4d, and a positioning protrusion 15 extending from the upper portion to the upper surface of the engaging recess 13 is provided on the hinge C side. ..

As shown in FIGS. 3 and 4, the dispensing cylinder 5 is erected on the ring-shaped upper wall 16 connected from the lower end of the inner circumference and the inner edge of the upper wall 16 and the height of the dispensing cylinder 5. It is composed of an inward pouring cylinder 17 which is formed lower than the ground and has an inner pouring outlet.
The upper wall 16 is provided with a liquid return hole 18 drilled from the central portion on the opposite side of the hinge C to both sides to a predetermined range, and an air replacement hole 19 drilled on the hinge C side. ..

As shown in FIGS. 1, 3 and 4, the lid body B is rotatably attached to the upper end of the outer peripheral wall portion 9 of the cap body A via the hinge C, and is attached to the top wall 20. , Suspended from the peripheral edge of the top wall 20 and vertically provided with hinges C at the lower end of the outer circumference, and suspended from the lower surface of the top wall 20, the plug D is shaken inward within a predetermined range. It is provided with a retaining cylinder 22 for holding it movably.
On the lower surface of the top wall 20, a deformable thin-walled portion 23 is provided around the inside of the retaining cylinder 22.

At the lower end of the side peripheral wall 21, an engaging recess 24 that engages with the lid engaging portion 7 of the cap body A to maintain the closed state is provided around the inner circumference, and is located on the side opposite to the hinge C at the lower part of the outer circumference. An arc-shaped handle portion 25 is provided.

The retaining cylinder 22 is formed at a height for holding the plug body D so as to be swingable within a predetermined range, and a retaining protrusion 26 is projected in the circumferential direction at the lower part of the inner circumference.

As shown in FIGS. 1, 2, 3 and 5, the plug body D is vertically hung from the top wall 30 that covers the pouring cylinder 5 of the cap body A when the lid is closed, and from the inner lower surface of the top wall 30. It includes a close contact cylinder 31 in which the outer periphery of the tip portion is inserted into the upper part of the inner circumference of the injection cylinder 5 to be sealed when the lid is closed, and an engagement cylinder 32 vertically hung from the outer edge portion of the top wall 30.
The close contact cylinder 31 of the present embodiment has improved sealing performance because the tip portion thereof is sandwiched between the inner circumference of the injection cylinder 5 and the outer circumference of the inner injection cylinder 17 when the lid is closed.

In this embodiment, the top wall 30 is a ring-shaped inner surface that is connected to the outer top wall 30a formed between the engaging cylinder 32 and the close contact cylinder 31 at a predetermined position on the inner circumference of the close contact cylinder 31. It is composed of a top wall 30b and a dome-shaped central top wall 30c that bulges upward from the upper surface of the inner edge of the inner top wall 30b.
Further, inside the close contact cylinder 31, the inner close contact cylinder 35 is vertically hung from the lower surface of the inner edge of the inner top wall 30b, and when the lid is closed, the outer periphery of the tip portion is inserted into the upper inner circumference of the inner injection cylinder 17 to be sealed. Is provided.

Four U-shaped cutouts 36 formed from the inner peripheral side to the outer peripheral side in a predetermined circumferential direction are bored in the outer top wall 30a at intervals of 90 °, and FIG. 2A ), Each notch 36 is formed so as to extend inward and upward from the upper end of the inner circumference of the engaging cylinder 32 in the notch 36 and to project the upper surface upward from the upper surface of the outer top wall 30a. A bend portion 37 that can be deformed in the vertical direction is provided, and a hemispherical protrusion 38 is provided on the upper surface of the bend portion 37.
In this embodiment, four bend portions 37 are provided on the outer top wall 30a, but any number of bend portions 37 may be provided as long as they are provided at a plurality of bend portions 37 at intervals in the circumferential direction.
Further, in this embodiment, the protruding portion 38 projecting from the upper surface of the bend portion 37 is in contact with the lower surface of the top wall 20 of the lid body B when the lid is closed, but it may be in contact with or close to the lower surface. ..

The lower end of the engaging cylinder 32 is inserted into the engaging recess 13 of the base wall 4 of the cap body A with the lid closed, and the lower surface of the engaging cylinder 32 abuts or approaches the bottom surface of the engaging recess 13 and has an inner circumference. The lower end portion is formed at a height that engages with the locking protrusion 14 of the engaging surface 4d of the base wall 4.
At the upper end of the outer circumference of the engaging cylinder 32, when the plug body D is attached to the lid body B, the outer edge portion is located above the retaining protrusion 26 of the retaining cylinder 22 of the lid body B, and the lower surface of the outer edge end is A locking portion 39 is provided so as to engage with the upper surface of the tip of the retaining protrusion 26 to prevent it from falling off, and is formed with a swingable diameter between the retaining cylinder 22 and the top wall 20.

At the lower end of the engaging cylinder 32, a positioning recess 40 that fits into the positioning protrusion 15 of the base wall 4 in a closed state is provided on the hinge C side from the lower end, and has a predetermined range on the opposite side of the hinge C. An inner peripheral notch 41 is formed on the inner circumference so as not to engage with the locking protrusion 14 of the engaging surface 4d of the base wall 4 in the closed state.

Next, the usage mode and the action and effect of this example will be described.
In the hinge cap of this embodiment, it is necessary to assemble the plug body D inside the lid body B before the step of first closing the lid, and with the lid body B shown in FIG. 4 open, a mark (not shown) or the like is used. When the plug body D and the lid body B are aligned in the circumferential direction and the plug body D is pushed into the inner circumference of the retaining cylinder 22, the locking portion 39 at the outer edge of the plug body D is released to the inner circumference of the retaining cylinder 22. The plug body D is held in the retaining cylinder 22 by overcoming the retaining protrusion 26.

Next, the lid body B is rotated via the hinge C and put on the cap body A to close the lid.
At that time, as shown in FIG. 1, the tip of the close contact cylinder 31 of the plug body D attached to the lid body B is located on the inner circumference of the injection cylinder 5 of the cap body A and the outer circumference of the inner injection cylinder 17. It is tightly sealed in a sandwiched state, and the lower outer circumference of the inner close contact cylinder 35 is tightly sealed to the inner circumference of the inner discharge cylinder 17.
Further, in the middle of closing the lid, in the plug body D, the positioning recess 40 recessed in the engaging cylinder 32 on the hinge C side engages with the positioning protrusion 15 of the cap body A, and the plug body D is inside the lid body B. Close the lid so that it does not rotate.

Further, the plug body D descends while the tip end portion of the engaging cylinder 32 abuts on the upper surface of the inclined portion 4b of the base wall 4 of the cap body A from the hinge C side, and engages while being guided by the inclined surface. The tip of the cylinder 32 is inserted into the engaging recess 13 of the base wall 4, and the lower end of the inner circumference of the engaging cylinder 32 abuts on the engaging surface 4d and engages.
In this embodiment, the engaging cylinder 32 is not engaged with the locking protrusion 14 of the engaging surface 4d of the base wall 4 in the closed state on the inner circumference of the predetermined range on the opposite side of the hinge C. Since the notched inner peripheral notch 41 is provided, the inner peripheral lower end of the engaging cylinder 32 has a locking protrusion on the engaging surface 4d of the cap body A except for a predetermined range on the opposite side of the hinge C. It is in close contact with the portion 14 and locked.

The hinge cap of this embodiment is in the unopened state before the hinge cap is attached to the container E or after the hinge cap is attached to the container E, and the lid engaging portion 7 of the cap body A and the lid body B are engaged. In addition to the engagement of the hinged recess 24, the engagement surface 4d of the cap body A was engaged with the locking protrusion 14 and the inner peripheral surface of the engagement cylinder 32 of the plug body D, so that the lid body B was further attached. In addition to the tip of the close contact cylinder 31 of the stopper body D being brought into close contact with the inner circumference of the injection cylinder 5 of the cap body A and the outer circumference of the inner discharge cylinder 17, the outer circumference of the inner close contact cylinder 35 Since the lower portion is in close contact with the inner circumference of the inward dispensing cylinder 17, the closed lid and the sealed state can be maintained more firmly.
Further, when the lid is closed, the protrusions 38 formed on the bend portions 37 of the plug body D come into contact with the lower surface of the top wall 20 of the lid body B, so that the lower surface of the engaging cylinder 32 and the bottom surface of the engaging recess 13 Together with being in contact or in close proximity, it prevents the plug D from swinging within the hinge cap.

Next, as shown in FIG. 1, the closed hinge cap is plugged into the mouth 1 of the container E filled with the content liquid and attached.
In the plugging step, the mouth portion 1 of the container E is applied to the annular groove formed between the inner cylinder 8 of the mounting portion 3 and the outer peripheral wall portion 9, and a pressing force is applied from above the lid body B to apply a pressing force to the outer circumference. The engaging protrusion 10 of the wall portion 9 gets over the fitting protrusion 2 of the mouth portion 1 and is fitted, and the mouth portion 1 of the container E is the outer circumference of the inner cylinder 8, the inner circumference of the outer peripheral wall portion 9, and the lid. It is attached by being sandwiched by the lower surface of the joint portion 7.

The hinge cap of this embodiment is attached by tapping into a container E filled with a high-temperature content liquid, and then the stopper body D is moved upward from the inside of the pouring cylinder 5 due to an increase in the internal pressure in the container E due to the high temperature. However, the protruding portion 38 of each bend portion 37 of the plug body D is in contact with the lower surface of the top wall 20 of the lid body B in a point contact state, and the pushing force deforms the bend portion 37. Since the plug D is pushed back downward by the restoring force against the deformation, the plug D and the pouring cylinder 5 can be kept sealed and closed.
In this embodiment, a protrusion 38 that comes into contact with the lid B is provided on the upper surface of the bend 37 so as to make point contact with the lower surface of the top wall 20 of the lid B, but above the bend 37. It is also possible to bring the end face directly into contact with or close to the lid B.

Further, when a pressing force is applied to the lid body B from above due to an impact received at the time of tapping or dropping with the lid closed, the lid body B is attached to the cap body A as shown in FIG. 2 (b). At that time, each bend portion 37 of the plug body D is pushed in, so that the bend portion 37 is deformed to absorb the impact and the plug body D is pushed against the cap body A. It prevents and does not affect the close contact due to the engagement between the plug body D and the cap body A.
When the impact at the time of tapping or dropping disappears, the plug body D returns to its original shape due to the restoring force of the bend portion 37.

As described above, in the hinge cap of the present embodiment, the pushing force due to the impact received at the time of tapping and dropping or the increase in the internal pressure in the container E due to the high temperature is suppressed by the bend portions 37 of the plug body D, and the hinge cap body D and the plug body D Since it does not affect the state of close contact with the cap body A, it is possible to prevent the contact from coming off or being damaged by each other.

In the hinge cap of this embodiment, a deformable thin-walled portion 23 is provided around the inside of the retaining cylinder 22 on the lower surface of the top wall 20 to alleviate the deformation of the top wall 20, so that the air inside the lid B can be relaxed. Can absorb pressure changes even if it expands thermally.
Further, as described above, the lid body B does not open due to the effect of the bend portion 37 of the plug body D.

When opening the hinge cap for pouring out the content liquid in the container E, the handle portion 25 of the lid body B is lifted, and the lid body B is rotated around the hinge C as a fulcrum to rotate the lid body A. Open the lid from.
At that time, the plug body D also rotates around the hinge C in conjunction with the lid body B, but the inner peripheral notch 41 is provided on the side opposite to the hinge C of the engaging cylinder 32 of the plug body D. Since the inner peripheral notch 41 is not fitted with the locking protrusion 14 formed on the engaging surface 4d of the base wall 4 of the cap body A, the resistance when opening the lid B is reduced. And the lid can be opened smoothly.

In the hinge cap of this embodiment, the bend portion 37 of the plug body D maintains the sealing property between the plug body D and the cap body A at the time of closing and the closed state, so that the lid of the cap body A is engaged. The engagement force between the joint portion 7 and the engagement recess 24 of the lid body B and the engagement force between the engagement surface 4d of the cap body A and the inner peripheral surface of the engagement cylinder 32 of the plug body D is not so large. Even if the sealability and the lid closed state can be maintained.

After opening the lid, the content liquid in the container E can be easily poured out from the pouring cylinder 5 simply by tilting the container E to the side opposite to the hinge C.
In this embodiment, the injection cylinder 5 of the cap body A has an upper wall 16 continuously provided from the lower end of the inner circumference, an inner injection cylinder 17 erected on the inner edge of the upper wall 16, and an upper wall. Since the liquid return hole 18 drilled on the side opposite to the hinge C of the 16 and the air replacement hole 19 drilled on the hinge C side of the upper wall 16 are provided, the content liquid in the container E can be collected. When the inclination of the container E is small, the content liquid is guided from the liquid return hole 18 to the pouring cylinder 5, so that the liquid can be poured little by little.

Further, when the inclination of the container E is increased, the liquid is guided to the opening of the inner pouring cylinder 17 in addition to the liquid returning hole 18, and a large amount of the content liquid is poured out by the inner pouring cylinder 17 having a large opening. You can guide to 5.
At this time, since the air replacement hole 19 is opened on the hinge C side of the upper wall 16, even if the content liquid blocks the inward pouring cylinder 17, air can be replaced and stable pouring can be performed.

Next, when the container E is returned to the upright state shown in FIG. 3 in order to finish the pouring of the content liquid, the content liquid remaining on the inner circumference of the pouring cylinder 5 is discharged inward to the pouring cylinder 5. It flows into the upper wall 16 surrounded by the cylinder 17, most of which is returned into the container E through the liquid return hole 18, and a part of which is returned into the container E through the air replacement hole 19.
After that, when the lid body B is closed again, the close contact cylinder 31 and the inner close contact cylinder 35 of the plug body D held by the lid body B are brought into close contact with the injection cylinder 5 and the inner injection cylinder 17 of the cap body A. The inside of the cap body A can be sealed, and even after the hinge cap is opened, the lid body B can be repeatedly opened and closed for use.

Further, after the container E is tilted when the lid is closed, the content liquid adhering to the lower surface of the central top wall 30c of the plug body D can be removed from the inner surface of the central top wall 30c of the plug body D when the container E is returned to the upright state. Since it is quickly returned to the container E through the inner contact cylinder 35, it does not remain on the inner surface of the central top wall 30c.

The hinge cap of the present invention has a plug body due to deformation of the bend portion of the plug body even if a pressing force is applied to the lid body due to an increase in the internal pressure inside the container due to high temperature and an impact received at the time of tapping or dropping. Prevents the cap body from moving with respect to the cap body and does not affect the adhesion between the plug body and the injection cylinder of the cap body, so that the adhesion may come off or the stopper body and the injection cylinder may be damaged from each other. In addition to being able to prevent this, hinge caps that can maintain the tightness inside the container even if the lid and cap body are not so tightly fitted, especially for containers filled with the content liquid at high temperature. Suitable as a heat-resistant hinge cap.

A Cap body B Lid body C Hinge D Plug body E Container 1 Mouth part 2 Fitting ridge 3 Mounting part 4 Base wall 4a Lower wall part 4b Inclined part 4c Upper wall part 4d Engagement surface 5 Injection cylinder 6 Locking protrusion Article 7 Lid Engagement part 8 Inner cylinder 9 Outer wall part 10 Engagement protrusion 13 Engagement recess 14 Locking protrusion 15 Positioning protrusion 16 Upper wall 17 Inward injection cylinder 18 Liquid return hole 19 Air replacement hole 20 Top wall 21 Side peripheral wall 22 Retaining cylinder 23 Thin-walled part 24 Engaging recess 25 Handle part 26 Retaining protrusion 30 Top wall 30a Outer top wall 30b Inner top wall 30c Central top wall 31 Adhesion cylinder 32 Engagement cylinder 35 Inner adhesion cylinder 36 Notch 37 Bend 38 Protrusion 39 Locking 40 Positioning recess 41 Inner circumference notch

Claims (6)

A hinge cap consisting of a cap body attached to the mouth of a container, a lid body attached to the cap body via a hinge, and a plug body held inside the lid body.
The cap body includes a base wall that closes the opening of the mouth, a pouring cylinder that is erected from around the spout that penetrates the base wall, and an engaging surface formed on the base wall on the outside of the pouring cylinder. With
The plug body includes a top wall, a close contact cylinder that is hung from the top wall and seals the inner circumference of the dispensing cylinder, and an engaging cylinder that is hung from the outer edge of the top wall and engages with the engaging surface. A hinge cap formed between the close contact cylinder of the top wall and the engaging cylinder, and provided with a bend portion that can come into contact with the lid. The hinge cap according to claim 1, wherein a plurality of bend portions are formed at intervals in the circumferential direction of the top wall. The hinge cap according to claim 1 or 2, wherein the bend portion is formed from the outer peripheral side to the upper inner peripheral side of the notch formed in the top wall. The hinge cap according to any one of claims 1 to 3, wherein the bend portion is provided with a protrusion that can come into contact with the lid on the upper surface. The hinge cap according to any one of claims 1 to 4, wherein the engaging cylinder has an inner peripheral notch formed on the inner peripheral side opposite to the hinge. The lid is provided with a top wall, a side peripheral wall suspended from the peripheral edge of the top wall, and a retaining cylinder suspended from the lower surface of the top wall to hold the plug inward.
The hinge cap according to any one of claims 1 to 5, wherein the top wall is provided with a deformable thin-walled portion provided around the inside of a retaining cylinder.

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