JP5840080B2 - Hinge cap - Google Patents

Description

  The present invention relates to a hinge cap in which an upper lid is connected to a cap body attached to a mouth portion of a container via a hinge, and in particular, the inside of the cap is filled with a high-temperature heat-sterilized content liquid or a high-temperature shower filled in the container. A hinge cap designed to prevent the cap from opening when the air is heated and the cap top lid from opening, and also to prevent water from being sucked into the cap during cooling with hot or cold water showers, etc. It is about.

It has been conventionally practiced to fill the heated contents liquid to sterilize the inside, and to wash and cool the container fitted with a hinge cap by using a hot water shower or the like from the outside.
In such a container filling process, a high temperature content liquid is filled, or shower water of various temperatures is poured for cleaning and cooling, resulting in a large temperature difference between the inside and outside of the cap. May be larger.
For example, at the time of high temperature filling or high temperature showering, the air inside the cap is warmed and expanded, the internal pressure increases, pushes up the upper lid, and the problem of “opening the upper lid” may occur.
Also, in the shower for cooling or low temperature shower, the air inside the cap cools and contracts, the internal pressure decreases, the negative pressure state becomes stronger, and the problem of `` water suction '' that sucks shower water with the outside air occurs There is also.

  When the cap is crushed and the cap is crushed to prevent the upper lid from being inadvertently opened due to a temperature difference, the air inside the cap is exhausted and restored to its original shape after plugging In addition, since the seal is quickly restored and the inside of the cap is in a negative pressure state, a hinge cap that prevents the opening of the cap and prevents the lid from opening even when the cap temperature rises due to high temperature showers etc. (For example, refer to Patent Document 1).

JP 2007-99319 A

The hinge cap described in Patent Document 1 as a prior art will be briefly described.
As shown in FIG. 6, an air groove 134 is provided on the upper inner surface 133 a of the engaging portion 133 of the upper lid B that abuts on the flat lid engaging surface 125 on the upper surface of the lid engaging portion 118 of the cap body A, and the dispensing cylinder 106 is provided. An internal pressure relief portion 145 made of a rib is provided on the inner peripheral surface of the inner surface.
When the hinge cap is pressed from the upper part at the time of plugging, the upper lid B is crushed and deformed so that the lower end of the outer cylindrical wall 131 spreads outward, and the engagement convex portion 135 of the upper lid B and the cap body A bulge out. The seal with the portion 127 is released, and the inner cylinder 132 of the upper lid B rides on the internal pressure relief portion 145 of the extraction cylinder 106 and is deformed, whereby the seal between the extraction cylinder 106 and the inner cylinder 132 is released.
As a result, the air chamber b inside the dispensing cylinder 106 communicates with the air chamber a outside the dispensing cylinder 106, the air chamber a communicates with the outside air, and the air in the cap is discharged.

When the pressing force is released after the plugging, the upper lid B returns to its original shape. However, since each seal is restored before it completely returns to its original shape, the pressure inside the cap is negative. It becomes a state.
In the conventional example, since the inside of the cap is in a negative pressure state as described above, an increase in the internal pressure can be suppressed even when the temperature of the cap becomes high due to a high temperature shower or the like. Demonstrate.
However, if the negative pressure in the cap is increased in order to reliably prevent “opening of the upper lid”, the problem of “water suction” may occur, in which shower water and water adhering to the outside are sucked together with the outside air. .
For this reason, if the sealing pressure between the engaging convex portion 135 and the bulging portion 127 is increased to ensure sealing, the cap strength of the outer cylinder wall 131 and the like of the upper lid B must be increased, resulting in an increase in cost. In addition, if the cap strength is increased, the outer cylinder wall 131 may not be sufficiently deformed by the pressing force at the time of plugging, and the release of the seal may be insufficient, so that sufficient negative pressure is achieved after plugging. In the end, the internal pressure of the cap increased, and the “upper lid opening” sometimes occurred.

  An object of the present invention is to solve the above-mentioned problem, and while ensuring the seal when the cap is closed, the seal is easily released when the cap is plugged. In the negative pressure state, it suppresses the pressure increase of air in the cap due to heating, prevents inadvertent opening, and ensures that water enters the cap during showers for cleaning and cooling. An object of the present invention is to provide a hinge cap that can be prevented.

  In order to solve the above-described problems, the present invention provides a hinge cap comprising a cap body attached to the mouth of a container as a hinge cap and an upper lid connected to the cap body via a hinge. The lid engaging portion is erected on the upper portion of the engaging tube portion into which the mouth portion of the container is fitted, and the upper portion of the lid engaging portion is provided with an annular bulging portion protruding from the outer peripheral surface, and an annular bulging portion. A top plane that continues from the top and a top protruding cylinder that is erected on the inner peripheral side of the top plane, and the upper lid is a top wall and an outer cylinder wall that is suspended from the top wall outer periphery and is connected to a hinge at a predetermined site A lower seal surface that is fitted into an annular bulging portion of the lid engaging portion to form an annular bulging portion and a first seal portion, and an inner circumference thereof A locking recess having a locking upper surface that contacts the top plane of the lid engaging portion is provided on the side, and is higher than the locking recess of the outer cylinder wall. Are provided with an outer peripheral surface of the top protruding cylinder, an upper seal surface that forms a second seal portion, and a hanging rib that protrudes inward from the upper seal surface. Alternatively, a configuration in which air grooves are formed in the radial direction on the top plane is adopted.

  Further, as another embodiment of the hinge cap, the pouring cylinder erected on the inner peripheral side from the lid engaging portion of the cap body has an outer peripheral surface of a sealing cylinder in which the inner peripheral surface is suspended from the top wall of the upper lid A third seal portion is formed in contact with the first seal portion, and a vertical rib projecting on the inner peripheral surface below the third seal portion is provided. A structure in which a support peripheral surface that comes into contact with the outer peripheral surface of the upper end of the extraction cylinder of the cap body is provided on the inner peripheral surface above the hanging rib of the outer cylinder wall, from the lid engaging portion of the cap body A configuration is adopted in which convex portions slightly projecting at a plurality of locations on the circumference are formed on the upper surface of the upper wall of the outer peripheral side or the lower end surface of the outer cylinder wall of the upper lid.

The hinge cap according to the present invention includes a first seal portion formed by an annular bulge portion and a lower seal surface between the outer cylinder wall of the upper lid and the lid engaging portion of the cap body, and an outer peripheral surface and an upper portion of the top protruding cylinder. Since the sealing is performed by the two sealing portions of the second sealing portion formed by the sealing surface, the sealing can be surely performed without particularly increasing the sealing pressure, and a sufficient negative pressure can be maintained.
In addition, since an inward projecting hanging rib is formed above the upper seal surface of the inner peripheral surface of the outer cylinder wall of the upper lid, the outer peripheral surface of the top projecting cylinder rides on the hanging rib when the stopper is plugged. The seal of the seal part is released, and the reaction force from the top protruding cylinder urges the outer cylinder wall to be deformed outward, the first seal part is also released, the inside and outside of the cap communicate, and the air inside the cap It is surely discharged.
For this reason, the hinge cap of the present invention can sufficiently reduce the internal pressure of the cap at the time of stoppering and can reliably seal the inside and outside of the cap, so that "opening of the upper lid" and "water suction" are ensured. Can be prevented.

Further, in the embodiment in which the vertical rib is provided below the third seal portion in contact with the sealing cylinder on the inner peripheral surface of the extraction cylinder, the sealing cylinder rides on the vertical rib when plugging, and the inside of the extraction cylinder The outside can also be communicated, and the entire inside of the cap can be set to a negative pressure.
Furthermore, in the embodiment in which the support peripheral surface that contacts the upper outer peripheral surface of the dispensing cylinder is provided on the inner circumferential surface of the outer cylinder wall, when the closed and sealed cylinder is fitted into the dispensing cylinder, It is possible to suppress the outward deformation of the upper part of the dispensing cylinder to increase the sealing pressure of the third seal part, to reliably prevent the leakage of the contents, and to prevent the air chamber formed inside the dispensing cylinder. The pressure can be maintained.

It is a cross-sectional side view which shows the state which closed the hinge cap which is 1st Example of this invention. It is a figure which shows the state which opened the hinge cap which is 1st Example of this invention, (a) is a top view, (b) is a cross-sectional side view. It is a principal part enlarged view of FIG. 1, (a) has shown the state before stoppering, (b) has shown the state at the time of stoppering. It is a cross-sectional side view which shows the state which closed the hinge cap which is 2nd Example of this invention. It is a principal part enlarged view of FIG. 4, (a) shows the state before stoppering, (b) has shown the state at the time of stoppering. It is a figure which shows the hinge cap of a prior art example, (a) is a cross-sectional side view, (b) is a principal part enlarged view of figure (a).

  Next, the hinge cap of the present invention will be described with reference to the drawings showing examples.

1-3, A is a cap main body attached to the container main body D, and B is an upper lid formed integrally with the cap main body A via a hinge C.
The mouth portion 1 of the container body D is provided with an engaging protrusion 2 projecting annularly on the outer periphery.

As shown in FIGS. 1 and 2, the cap body A is connected to the bottom wall 5 that seals the inside of the container, the pouring cylinder 6 that is erected on the bottom wall 5, and the periphery of the bottom wall 5. It consists of an engagement cylinder portion 7 that fits into the mouth portion 1 of D.
The bottom wall 5 is provided with a thinned weakened portion 8 for opening the spout when in use on the inner peripheral side of the dispensing tube 6, and the upper surface of the bottom wall 5 is defined by the weakened portion 8. A pull ring 10 that pulls up and removes the removed portion 9 is provided through a support 11.

The dispensing tube 6 is inclined so that the upper part slightly spreads outward, and the upper end forms a curved part 12 that warps outward, and a vertical rib 13 protruding vertically in the lower part of the inner peripheral surface. Is provided at a predetermined height which will be described later.
In this embodiment, two vertical ribs 13 arranged side by side are provided at two locations on the circumference that are approximately 90 ° apart from the hinge C side. However, the vertical ribs 13 may be composed of only one, The position of can also be determined appropriately.

The engagement cylinder portion 7 includes an annular upper wall 15 connected to the outer peripheral edge of the bottom wall 5 on the inner peripheral side, an inner cylinder 16 suspended from the inner peripheral edge of the upper wall 15, and an outer peripheral edge of the upper wall 15. An outer cylinder 17 suspended from the upper wall 15 and a lid engaging portion 18 which is erected on the upper portion of the upper wall 15 and engages with the upper lid B. Between the inner cylinder 16 and the outer cylinder 17, there is an annular shape. An annular fitting portion 19 having a groove shape is formed.
A locking portion 20 that engages with the engaging protrusion 2 of the mouth portion 1 of the container body D protrudes from the inner peripheral lower portion of the outer cylinder 17, and the engaging cylinder portion 7 is plugged. By fitting the mouth portion 1 of the container body D into the annular fitting portion 19, the engaging protrusion 2 and the locking portion 20 are engaged, and the cap body A is mounted on the mouth portion 1 of the container body D. The

The outer cylinder 17 of the present embodiment is a single cylinder having no function for separating from the container, but it is easily broken and separated from the container as in Patent Document 1 cited as the prior art. It is good also as the thing of a double cylinder shape which can be performed.
That is, the outer cylinder 17 has a double cylinder structure of an outer cylinder part connected to an inner cylinder part and a hinge, and a thick connecting piece provided on the opposite side of the hinge C on both cylinder parts and the hinge C. By connecting continuously through a plurality of breakable weakening pieces arranged at intervals on the side, the top cover B is pulled up to break the weakening pieces, and the cap can be easily removed from the mouth 1 of the container body D. Can be separated.

As shown in FIG. 3, an upper part of the lid engaging part 18 has an annular bulging part 22 projecting from the outer peripheral surface, a top part flat 23 extending from the annular bulging part 22 to the top part, and an inner peripheral side of the top part plane. An upright protruding cylinder 24 is provided.
The lower surface of the annular bulging portion 22 forms a lower seal surface 36 of the upper lid B, which will be described later, and a first seal portion S1, and the upper portion of the top protruding cylinder 24 is an upper seal surface 39 of the upper lid B, which will be described later, and a second seal portion. S2 is formed.
In FIG. 3, the vertical rib 13 in the XX cross section of FIG. 2A is indicated by an imaginary line (two-dot chain line).

As shown in FIG. 2 (a), convex portions that are defined with a predetermined width in the radial direction and are slightly protruded at a plurality of locations on the upper surface of the upper wall 15 on the outer peripheral side from the lid engaging portion 18. 25 is provided.
The convex surface portion 25 may be provided not on the upper wall 15 side of the cap body A but on the lower end surface side of the outer cylindrical wall 31 of the upper lid B.
As shown in FIG. 3, the convex portion 25 opens a slight gap between the upper wall 15 and the lower end surface of the upper lid B when the lid is closed, and the content liquid remaining on the upper surface of the upper wall 15 and the like. However, it is possible to prevent scattering when the lid is closed.
In the present embodiment, the convex portion 25 is provided at seven locations excluding the vicinity of the hinge C, but the number and arrangement thereof can be determined as appropriate. Further, the convex portion 25 may not be provided, and it is sufficient that a gap is formed between the lower end surface of the upper lid B and the upper surface of the upper wall 15 at the time of plugging.

1-3, the top cover B is composed of a top wall 30 and an outer cylindrical wall 31 suspended from the periphery of the top wall 30, and the cap body A is poured on the lower surface of the top wall 30. A sealing cylinder 32 that is inserted into the inner periphery of the cylinder 6 is provided vertically.
An end seal surface 33 that forms a third seal portion S3 in contact with the inner peripheral surface of the dispensing cylinder 6 is provided at the tip of the sealing cylinder 32 so as to slightly protrude from the outer periphery.
The outer cylinder wall 31 is connected to the cap body A via a hinge C at a predetermined position on the outer periphery of the lower end, and includes a knob 34 on the opposite side of the hinge C.

A locking recess 35 into which the annular bulging portion 22 of the lid engaging portion 18 is fitted is provided at the lower portion of the outer cylindrical wall 31, and the locking recess 35 includes the lower surface of the annular bulging portion 22 and the first seal portion. The lower sealing surface 36 which forms S1, and the latching upper surface 37 which contact | abuts on the top plane 23 of the lid | cover engaging part 18 are provided.
The locking upper surface 37 is provided with air grooves 38 extending in the radial direction at a plurality of locations on the circumference.
In the present embodiment, the air grooves 38 are provided at four positions on the circumference including the hinge side, but the positions on the circumference may be determined as appropriate, and are not limited to the four positions, but may be determined as necessary. May be provided.

Further, on the inner peripheral surface of the outer cylinder wall 31 above the locking recess 35, an upper seal surface 39 that forms the outer peripheral surface of the top projecting cylinder 24 of the lid engaging portion 18 and the second seal portion is provided. A hanging rib 40 protruding inward is provided above the upper seal surface 39.
In the present embodiment, the upper seal surface 39 is flush with the inner peripheral surface of the outer cylinder wall 31, but is not necessarily flush.
Further, the hanging rib 40 is provided only at one location near the inside of the knob 34, but may be provided at a plurality of locations on the circumference as well as at one location.

Next, usage modes and operational effects of this embodiment will be described.
First, the upper lid B is closed and the cap is closed.
When the upper lid B is closed with respect to the cap body A, as shown in FIGS. 1 and 3A, the sealing cylinder 32 is fitted into the extraction cylinder 6 of the cap body A, and the end seal surface 33 is The third seal portion S3 is formed in contact with the inner peripheral surface of the dispensing cylinder 6.
At the same time, the locking concave portion 35 of the upper lid B engages with the lid engaging portion 18 of the cap body A and is fitted to the annular bulging portion 22, and the lower seal surface 36 of the locking concave portion 35 is the annular bulging portion 22. The first seal portion S1 is formed in pressure contact with the lower surface of the cover, and the upper seal surface 39 formed on the inner peripheral surface above the locking recess 35 is formed on the outer peripheral surface of the top protruding cylinder 24 of the lid engaging portion 18. The second seal portion S2 is formed by pressure contact.
The completely closed cap is sealed from the outside air by two seal portions, the first seal portion S1 and the second seal portion S2, and the third seal portion S3 allows the air chamber a to be placed outside the dispensing cylinder 6. Is formed, and an air chamber b is formed inside.

After the container body D is filled with the contents, the annular fitting part 19 of the closed cylinder cap engaging cylinder part 7 is applied to the mouth part 1 of the container body D, and pressed from above to be plugged. Attach the hinge cap to the mouth 1.
As shown in FIG. 3 (b), a strong pressing force is applied from the upper part of the top wall 30 of the upper lid B at the time of stoppering, and the locking upper surface 37 of the locking recess 35 is brought into contact with the top flat surface 23 of the lid engaging part 18. The outer cylindrical wall 31 is bent so as to be slightly pushed outward while the lower end surface is slid in pressure contact with the convex surface portion 25 and the support portion 26, and the upper lid B is slid. Crushes and descends.
Therefore, the lower portion of the outer cylindrical wall 31 is deformed so as to spread outward, the locking recess 35 is separated from the lid engaging portion 18, and the first seal portion S <b> 1 between the annular bulging portion 22 and the lower seal surface 36. Is released, and the convex surface portion 25 and the support portion 26 ensure a slight gap serving as an air flow path between the lower surface of the outer cylindrical wall 31 and the upper wall 15.

At the same time, when the upper lid B is lowered, the drooping rib 40 comes into contact with the upper part of the top projecting cylinder 24 of the lid engaging portion 18, and when the top projecting cylinder 24 rides on the drooping rib, the upper part of the top projecting cylinder 24 The second seal portion S <b> 2 between the outer peripheral surface and the upper seal surface 39 on the inner peripheral surface of the outer cylindrical wall 31 is also released.
Then, the air chamber a in the cap communicates with the outside air via the air groove 38 provided on the locking upper surface 37.
Instead of the air groove 38 provided on the locking upper surface 37, an air groove may be provided on the top flat surface 23 side of the lid engaging portion 18.

On the other hand, the sealing cylinder 32 is also lowered by the lowering of the upper lid B at the time of plugging, and the end seal surface 33 rides on the vertical ribs 13 on the inner periphery of the dispensing cylinder 6, and the sealing cylinder 32 is slightly bent and is third. Sealing of the seal portion S3 is released.
Therefore, an air flow path is also formed between the air chamber a and the air chamber b in the cap, and the inside and outside of the cap are completely communicated from the air chamber b to the air chamber a and further to the outside air. The air compressed by descending is discharged to the outside through the released third seal portion S3, the released second seal portion S2, the air groove 38, and the released first seal portion S1.

After that, when the stoppering is finished and the pressing force is released, the outer cylindrical wall 31 of the upper lid B that has been bent outward is restored, and the upper lid B rises to return to the original position and returns to the original shape. .
In the process of returning the upper lid B to the original position and shape, the hanging rib 40 and the vertical rib 13 are separated from the upper part of the top projecting cylinder 24 and the end seal surface 33 of the sealing cylinder 32, respectively. 3 The seal part is restored, but the upper lid B continues to rise until it is completely restored, so that the inside of the cap has a negative pressure.
Further, the locking recess 35 of the outer cylindrical wall 31 is fitted into the annular bulging portion 22 of the lid engaging portion 18 so that the first seal portion S1 is quickly restored, and the outer cylindrical wall 31 and the lid are engaged. Since the space between the two parts is sealed by the two seal parts, the first seal part S1 and the second seal part S2, it is possible to withstand a larger differential pressure inside and outside the cap without increasing the individual seal pressure. Thus, the inside and outside of the cap can be reliably sealed to maintain a negative pressure sufficient to prevent the lid from being opened, and suction of shower water or the like can be reliably prevented.

  In the present embodiment, the third seal portion S3 is formed by the dispensing tube 6 and the sealing tube 32, and the vertical ribs 13 for releasing the seal of the third seal portion S3 are provided, but these third seal portions are provided. The structure of S3 and the vertical rib 13 is not necessarily required, and is appropriately adopted depending on the usage of the cap.

Next, a description will be given of a second embodiment in which the configuration of the inner peripheral surface of the upper lid with respect to the dispensing cylinder is changed so as to ensure the sealing of the third seal portion.
Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, and differences will be mainly described.

4 and 5A, a support peripheral surface 41 projecting in an annular shape is provided on the upper inner peripheral surface of the upper lid B, and is in contact with the outer peripheral surface of the curved portion 12 at the upper end of the dispensing cylinder 6.
On the support peripheral surface 41, air longitudinal grooves 42 are provided above a position in contact with the curved portion 12 and extend in the vertical direction.
On the inner peripheral surface of the outer cylindrical wall 31 below the support peripheral surface 41, a hanging rib 40a protrudes inward to the vicinity of the upper seal surface 39 and hangs down.
Similar to the hanging rib 40 of the first embodiment, only one hanging rib 40a is provided in the vicinity of the inside of the knob 34. However, the hanging rib 40a may be provided not only at one place but also at a plurality of places on the circumference. .

In the present embodiment, the outer peripheral surface of the bending portion 12 of the dispensing cylinder 6 is in contact with the support peripheral surface 41, the bending portion 12 is sandwiched between the sealing cylinder 32, and the inner peripheral surface of the dispensing cylinder 6 is the end portion. Since it is pressed toward the seal surface 33, the seal pressure of the third seal portion can be increased and the air chamber a and the air chamber b can be reliably sealed.
As described above, when the sealing by the third seal portion is ensured, the pull ring 10 is pulled, and after removing the removal portion 9 of the bottom wall 5 and opening, the leakage of the contents of the container body D can be reliably prevented. This is preferable when the internal pressures of the air chamber a and the air chamber b are to be controlled independently.

When the hinge cap of this embodiment is plugged, as shown in FIG. 5 (b), the end seal surface 33 is moved vertically to the inner periphery of the dispensing cylinder 6 by the lowering of the upper lid B, as in the first embodiment. Riding on the rib 13, the sealing cylinder 32 is slightly bent and the sealing of the third seal portion S3 is released.
At this time, the outer peripheral surface of the curved portion 12 of the dispensing tube 6 is in contact with the range in which the air longitudinal groove 42 of the support peripheral surface 41 extends so that the air in the air chamber b compressed by the lowering of the upper lid B can be released. I have to.
Since the support peripheral surface 41 does not necessarily need to be a seal surface, the air vertical groove 42 may not be provided, and the air vertical groove 42 extends downward from a position in contact with the curved portion 12 to support the peripheral surface. You may provide to the lower end of 41.

  The hinge cap of the present invention puts the inside of the cap into a negative pressure state when plugging, suppresses an increase in the pressure of air in the cap due to heating, prevents the lid from being opened, and allows water to enter the cap at the time of showering. Since this can be reliably prevented, it can be widely used as a hinge cap to be attached to a container filled with high-temperature contents or subjected to a high-temperature shower having a large temperature difference.

A Cap body B Upper lid C Hinge D Container body S1 1st seal part S2 2nd seal part S3 3rd seal part a, b Air chamber 1 Mouth part 2 Engagement ridge 5 Bottom wall 6 Extraction cylinder 7 Engagement cylinder part 8 weakening part 9 removal part 10 pull ring 11 support pillar 12 bending part 13 vertical rib 15 upper wall 16 inner cylinder 17 outer cylinder 18 lid engaging part 19 annular fitting part 20 locking part 22 annular bulging part 23 top flat surface 24 top protrusion Tube 25 Convex surface 30 Top wall 31 Outer tube wall 32 Sealed tube 33 End seal surface 34 Knob 35 Locking recess 36 Lower seal surface 37 Locking upper surface 38 Air groove 39 Upper seal surface 40 40a Hanging rib 41 Support peripheral surface 42 Air vertical groove 106 Outlet cylinder 118 Lid engaging part 125 Lid engaging surface 127 Swelling part 131 Outer cylinder wall 132 Inner cylinder 133 Engaging part 133a Upper inner surface 134 Air groove 135 Engaging convex part 145 Internal pressure relief part

Claims (4)

In a hinge cap consisting of a cap body attached to the mouth of the container, and an upper lid connected to the cap body via a hinge,
In the cap body, a lid engaging part is erected on the upper part of the engaging cylinder part into which the mouth part of the container is fitted,
At the upper part of the lid engaging portion, an annular bulging portion that protrudes to the outer peripheral surface, a top flat surface that continues from the annular bulging portion, and a top protruding cylinder that is erected on the inner peripheral side of the top flat surface are provided,
The upper lid includes a top wall and an outer cylindrical wall that hangs down from the outer periphery of the top wall and is connected to the hinge at a predetermined site.
A lower seal surface that is fitted into the annular bulging portion of the lid engaging portion to form the annular bulging portion and the first seal portion, and a lid engagement on the inner circumferential side of the inner circumferential surface of the outer cylinder wall. A locking recess with a locking top surface that abuts the top plane of the joint is provided,
On the inner peripheral surface of the outer cylinder wall above the locking recess, the outer peripheral surface of the top protruding cylinder, the upper seal surface forming the second seal portion, and the droop projecting inward from the upper seal surface Ribs are provided,
A hinge cap characterized in that an air groove is formed in a radial direction on the upper surface or top flat surface of the latch.   The pouring tube erected on the inner peripheral side from the lid engaging portion of the cap body forms the third seal portion with the inner peripheral surface being in contact with the outer peripheral surface of the sealing tube suspended from the top wall of the upper lid. The hinge cap according to claim 1, further comprising a longitudinal rib projecting on an inner peripheral surface below the third seal portion.   The hinge according to claim 1 or 2, wherein a support peripheral surface that abuts on an outer peripheral surface of an upper end of the extraction tube of the cap body is provided on an upper portion of the inner peripheral surface above the hanging rib of the outer cylindrical wall of the upper lid. cap.   The convex part which protrudes slightly in several places on the circumference is formed in the upper wall upper surface of the outer peripheral side from the lid engaging part of a cap main body, or the lower end surface of the outer cylinder wall of an upper cover. The hinge cap in any one of -3.

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