JP2020083441A - cap - Google Patents

Abstract

To smoothly dispense a content from a dispensing hole while having high sealing properties, and to improve operability in opening.SOLUTION: The present invention relates to a cap 1 comprising a topped cap body 11 mounted on a mouth part W1 of a container body W, and a lid body 13 opening/closing a top wall part 12 of the cap body. At a top wall part, a dispensing hole 14 for content, a first cylinder part 15 covering the dispensing hole from radially outside, a dispensing cylinder part 16 covering the first cylinder part from radially outside, and an air intake hole 17 located between the first cylinder part and the dispensing cylinder part are formed. At the lid body, an inner seal cylinder part 18 fitted detachably into the dispensing hole, and an outer seal cylinder part 19 fitted detachably onto the first cylinder part and fitted detachably in the dispensing cylinder part are formed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cap.

Conventionally, for example, as shown in Patent Document 1 below, a cap main body having a cylindrical top mounted to the mouth of a container main body, and a lid for opening and closing the top wall of the cap main body are provided. There is known a cap in which a pouring hole is formed in the portion, and a plugging portion that closes the pouring hole is connected via a fragile weakening portion.
This type of cap can be provided with a high sealing property, for example, it becomes possible to fill hot contents.

JP, 2007-99319, A

However, in the above-mentioned conventional cap, it is necessary to break the weakened portion by pulling up the unplugged portion when opening, and there is room for improvement in operability at opening.

The present invention has been made in consideration of such circumstances, and it is possible to smoothly pour the contents out of the pour hole while improving the operability at the time of opening while providing a high sealing property. The purpose is to provide a cap that can also be made.

In order to solve the above problems and achieve such an object, the cap of the present invention is a cap-shaped cylindrical cap body that is attached to the mouth of the container body, and the top wall of the cap body is opened and closed. A lid body for performing a pouring hole for the contents in the ceiling wall portion, a first tubular portion surrounding the pouring hole from the outside in the radial direction, and a diameter of the first tubular portion. And a suction hole located between the first cylinder portion and the discharge cylinder portion are formed, and the cover body can be attached to and detached from the discharge hole. An inner seal cylinder part fitted to the first cylinder part and an outer seal cylinder part detachably fitted to the first cylinder part and detachably fitted to the inside of the pouring cylinder part are formed.

According to this aspect of the invention, the lid body is detachably fitted to the inside of the spout hole, and the first seal member is detachably fitted to the inside of the spout hole. Since the fitted outer seal cylinder is formed, the spout hole is doubly sealed to the outside of the cap by the inner seal cylinder and the outer seal cylinder. Even if the inner diameter of the hole is not reduced or the conventional plugging portion is not provided, high sealing performance can be provided.
Therefore, at the time of opening, even if the weakened portion is not broken by pulling up the unplugged portion and the like, the pouring hole is opened only by opening the lid, and operability at the time of opening can be improved. ..
Since the air intake hole is formed in the ceiling wall in addition to the pouring hole, it is possible to prevent the contents pouring out from the pouring hole from interfering with the inflow of outside air into the container body. It becomes possible, and the contents can be smoothly poured out from the pouring hole. Since the intake hole is arranged between the first tubular portion and the pouring tubular portion, the intake hole can be sealed by the outer seal tubular portion.
Since the outer seal tubular portion is in contact with both the outer peripheral surface of the first tubular portion and the inner peripheral surface of the pouring tubular portion and is sandwiched in the radial direction, for example, due to an increase in internal pressure of the container body, It is possible to prevent the lid body from being accidentally detached from the cap body.

Here, the upper surface of the ceiling wall portion may gradually extend downward toward the intake hole.

In this case, since the upper surface of the top wall portion gradually extends downward toward the intake hole, even if the content remains on the upper surface of the top wall portion immediately after pouring out the content, When the container body is in the upright posture, the contents can be flowed through the upper surface of the top wall portion and guided to the intake hole to be collected in the container body.

Further, a vertical groove extending over the entire length in the vertical direction may be formed on the outer peripheral surface of the first tubular portion.

In this case, since the vertical groove extending over the entire length in the vertical direction is formed on the outer peripheral surface of the first tubular portion, when air is supplied from the lower surface side of the ceiling wall through the intake hole, the air is passed through the vertical groove to the outside. If the seal between the outer peripheral surface of the outer seal cylinder and the inner peripheral surface of the spout cylinder is insufficient, it will flow from the boundary between the lid and the cap body. Air leaks. Thereby, the sealability between the outer peripheral surface of the outer seal tubular portion and the inner peripheral surface of the spout tubular portion can be confirmed.
Since a vertical groove extending over the entire length in the up-down direction is formed on the outer peripheral surface of the first tubular portion, when air is supplied from the lower surface side of the top wall portion through the pouring hole, this air is supplied to the inner seal tubular portion. When the seal between the outer peripheral surface of the inner seal tubular portion and the inner peripheral surface of the pouring hole is insufficient, air flows out from the intake hole through the vertical groove. Thereby, the sealability between the outer peripheral surface of the inner seal tubular portion and the inner peripheral surface of the pouring hole can be confirmed.

The lid is connected to the cap body via a hinge, and the lid and the cap body are attached to and detached from parts of the lid and the cap body that are located on the opposite sides of the hinge that sandwich the cap shaft in the radial direction. The first engaging portion and the second engaging portion that engage with each other may be separately formed.

In this case, since the first engaging portion and the second engaging portion that are detachably engaged with each other are separately formed on the lid body and the cap body, for example, when the internal pressure of the container body rises, the lid body It is possible to reliably prevent the body from accidentally coming off the cap body.
Since the first engaging portion and the second engaging portion are separately formed in the lid body and the cap body, respectively, at the portions located on the opposite side of the hinge portion that sandwiches the cap shaft in the radial direction, It is possible to effectively transmit the applied pulling force around the hinge part to the first engaging part and the second engaging part, and by providing the first engaging part and the second engaging part. It is possible to prevent the lid body from becoming difficult to open.

In addition, a plurality of protruding ribs with which the lower end opening edge of the peripheral wall portion of the lid abuts are formed on the upper surface of the ceiling wall portion at intervals in the circumferential direction, and the upper surface of the protruding rib is an inner portion in the radial direction. Is located above the outer side portion in the radial direction, and the lower end opening edge of the peripheral wall portion of the lid is arranged on the outer side portion in the radial direction on the upper surface of the protruding rib, and the inner circumference of the peripheral wall portion of the lid body is The lower end of the surface may be located at the boundary between the radially inner portion and the radially outer portion of the upper surface of the protruding rib, and may be in contact with or close to the step portion that is radially outward.

In this case, since the lower end of the inner peripheral surface of the peripheral wall of the lid is in contact with or close to the step on the upper surface of the protruding rib, the relative displacement of the lid and the cap body in the radial direction is prevented. Can be suppressed.
Since a vertical gap is provided between the lower end opening edge of the peripheral wall of the lid and the position avoiding the protruding rib on the upper surface of the top wall, when pouring the contents from the pouring hole Even if a part of the contents hangs down on the upper surface of the ceiling wall, it is possible to prevent the contents from scattering outside the cap when the lid is closed.

ADVANTAGE OF THE INVENTION According to this invention, while having a high sealing property, the content can be smoothly poured out from a pouring hole, and the operability at the time of opening can also be improved.

It is a longitudinal section of a cap shown as one embodiment concerning the present invention. It is a longitudinal cross-sectional view of the cap shown as one embodiment according to the present invention, and is a view showing a position 90° away from the position shown in FIG. 1 around the cap axis. FIG. 3 is a sectional view taken along the line III-III of FIGS. 1 and 2.

Hereinafter, a cap 1 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the cap 1 according to the present embodiment opens and closes a cap-shaped tubular cap body 11 that is attached to the mouth W1 of the container body W and a top wall portion 12 of the cap body 11. And a lid body 13 for controlling.

In the illustrated example, the lid body 13 is also formed in a cylindrical shape with a top, and the lid body 13 and the cap body 11 are arranged coaxially with the common axis. Hereinafter, this common axis is referred to as a cap axis O, the top wall portion 31 side of the lid 13 is referred to as an upper side along the cap axis O, and the open end side of the peripheral wall portion 32 of the cap body 11 is referred to as a lower side. The direction intersecting with the cap axis O when viewed from above and below is called the radial direction, and the direction around the cap axis O is called the circumferential direction.

In the top wall portion 12, a pouring hole 14 for the contents, a first tubular portion 15 projecting upward and enclosing the pouring hole 14 from the outside in the radial direction, a first tubular portion 15 projecting upward, and a first tubular tube A spouting tubular portion 16 that surrounds the portion 15 from the outside in the radial direction, and an intake hole 17 that is located between the first tubular portion 15 and the spouting tubular portion 16 are formed.
The pouring hole 14, the first tubular portion 15, and the pouring tubular portion 16 are arranged coaxially with the cap axis O.

The spout hole 14 penetrates the top wall portion 12 in the vertical direction. A connecting plate 26 that projects in the radial direction is formed on the inner peripheral surface of the pouring hole 14. The connecting plate 26 has a rectangular shape extending in the radial direction when viewed from above and below. The connecting plate 26 connects the portions of the inner peripheral surface of the pouring hole 14 that face each other in the radial direction. The front and back surfaces of the connecting plate 26 face up and down. The connecting plate 26 is formed at the lower end of the inner peripheral surface of the pouring hole 14.
The connecting plate 26 may not be formed on the inner peripheral surface of the pouring hole 14. The connecting plate 26 may be provided with a gate portion for injection molding.

The upper end of the first tubular portion 15 is located below the upper end of the pouring tubular portion 16. The outer peripheral surface of the first tubular portion 15 radially faces the inner peripheral surface of the lower end portion of the pouring tubular portion 16. A vertical groove 15a is formed on the outer peripheral surface of the first tubular portion 15 and extends over the entire length in the vertical direction. A plurality of vertical grooves 15a are formed on the outer peripheral surface of the first tubular portion 15 at intervals in the circumferential direction. Two vertical grooves 15a are formed on the outer peripheral surface of the first tubular portion 15, and one vertical groove 15a is arranged on each side of the cap shaft O in the radial direction. In the radial direction, the direction in which the two vertical grooves 15a sandwich the cap shaft O in the radial direction is orthogonal to the direction in which the connecting plate 26 extends as viewed in the vertical direction.
The vertical groove 15a may not be formed on the outer peripheral surface of the first tubular portion 15.

The intake hole 17 penetrates the top wall portion 12 in the vertical direction. The opening area of the intake hole 17 is smaller than the opening area of the spout hole 14. The intake hole 17 is a long hole extending in the circumferential direction. The intake hole 17 is arranged at a position separated by 90° around the cap axis O with respect to the two vertical grooves 15a. The intake hole 17 is arranged between the first tubular portion 15 and the pouring tubular portion 16 at a portion closest to a hinge portion 21 described later. The upper surface of the top wall portion 12 gradually extends downward toward the intake hole 17.

An inner cylinder portion 24, which is located radially inward of the first cylinder portion 15 in the top wall portion 12, and has an inner side serving as a pouring hole 14, and upper end portions of the inner cylinder portion 24 and the first cylinder portion 15, respectively. And an annular top wall 25 that connects the two.
The inner cylinder portion 24 and the top wall 25 are arranged coaxially with the cap axis O. The space surrounded by the inner peripheral surface of the first cylindrical portion 15, the outer peripheral surface of the inner cylindrical portion 24, and the lower surface of the top wall 25 is open downward.

The lid 13 is detachably fitted into the spout hole 14 and the inner seal tubular portion 18 is detachably fitted to the first tubular portion 15, and is detachably attached to the spout tubular portion 16. The fitted outer seal tube portion 19 is formed. The inner seal tubular portion 18 and the outer seal tubular portion 19 are formed on the lower surface of the top wall portion 31 of the lid body 13.

A hollow portion 31 a is formed on the upper surface of the top wall portion 31, and the inner seal tubular portion 18 is arranged in a portion of the lower surface of the top wall portion 31 located immediately below the hollow portion 31 a. As a result, an impact force from the outside is less likely to be applied to the recess 31a among the upper surface of the top wall portion 31, and the inner seal tubular portion 18 is disengaged from the pouring hole 14 due to this impact force. Can be suppressed, and the sealing property can be improved. The outer peripheral edge of the recess 31a is located radially inward of the inner peripheral surface of the outer seal tubular portion 19.

The lower end portion of the outer peripheral surface of the inner seal tubular portion 18 is located radially inward of the portion located above the lower end portion. Here, the upper portion of the inner peripheral surface of the pouring hole 14 is located radially outward of the lower portion.
The lower end portion of the inner seal tubular portion 18 is fitted into the lower portion of the spout hole 14, and the portion of the inner seal tubular portion 18 located above the lower end portion is placed in the upper portion of the spout hole 14. It is fitted. As a result, two seal portions are provided on the outer peripheral surface of the inner seal tubular portion 18 and the inner peripheral surface of the pouring hole 14, respectively, so that the sealing performance can be improved.

The thickness of the outer seal cylinder portion 19 is equal to the size of the radial gap between the outer peripheral surface of the first cylinder portion 15 and the inner peripheral surface of the lower end portion of the spout cylinder portion 16, The lower end portion of the outer seal tubular portion 19 is in contact with the outer peripheral surface of the first tubular portion 15 and the inner peripheral surface of the lower end portion of the pouring tubular portion 16. Since the outer seal tubular portion 19 is radially sandwiched by the outer peripheral surface of the first tubular portion 15 and the inner peripheral surface of the pouring tubular portion 16, an impact force is applied to the top wall portion 31 of the lid body 13. Even if added, the outer seal cylinder portion 19 can be prevented from being displaced with respect to the first cylinder portion 15 and the spout cylinder portion 16, and the sealing performance of the outer seal cylinder portion 19 can be secured. can do. The lower end opening edge of the outer seal tubular portion 19 is separated upward from the upper surface of the top wall portion 12.

The lid 13 is connected to the cap body 11 via a hinge portion 21. The lid body 13, the cap body 11, and the hinge portion 21 are integrally formed. When viewed in the up-down direction, the central portions in the circumferential direction of the hinge portion 21, the intake hole 17, and the connecting plate 26 are located on the same straight line.

In the lid body 13 and the cap body 11, respectively, a first engagement portion 22 and a second engagement portion that are detachably engaged with portions of the lid body 13 and the cap body 11 that are located on the opposite side of the hinge portion 21 that sandwiches the cap shaft O in the radial direction. 23 are formed separately.
The first engagement portion 22 is arranged on a portion of the top surface of the top wall portion 12 of the cap body 11 that is located radially outside the pouring tube portion 16. The first engagement portion 22 is arranged on the upper surface of the ceiling wall portion 12 and is formed in a ridge shape extending in the circumferential direction.
The second engaging portion 23 is a lateral groove formed on the inner peripheral surface of the peripheral wall portion 29 of the lid 13 and extending in the circumferential direction.

First projection ribs (projection ribs) 27 and second projection ribs (projection ribs) 28 with which the lower end opening edge of the peripheral wall portion 29 of the lid body 13 abuts on the upper surface of the top wall portion 12 in the circumferential direction. A plurality is formed. The first projecting ribs 27 and the second projecting ribs 28 are arranged on the upper surface of the top wall portion 12 at positions radially outside the spouting tube portion 16 and avoiding the first engaging portion 22. ing. The lower end opening edge of the peripheral wall portion 29 of the lid body 13 is arranged on each upper surface of the first protruding rib 27 and the second protruding rib 28, and the lower end opening edge of the peripheral wall portion 29 of the lid body 13 and the top wall portion. On the upper surface of 12, a vertical gap is provided between a portion of the portion located on the outer side in the radial direction of the pouring tube portion 16 and a position where the first protruding rib 27 and the second protruding rib 28 are avoided. ing.

The circumferential size of the first protruding rib 27 is larger than the circumferential size of the second protruding rib 28. The first protruding rib 27 gradually decreases in size in the circumferential direction from the inner side to the outer side in the radial direction, and has a trapezoidal shape when viewed from the up and down direction. The second protruding rib 28 has a rectangular shape extending in the radial direction when viewed in the vertical direction, and has the same circumferential size over the entire radial direction. The radial inner ends of the first protruding ribs 27 and the second protruding ribs 28 are connected to the outer peripheral surface of the pouring tube portion 16.

The first protruding ribs 27 and the second protruding ribs 28 are arranged around the cap axis O at an angle of 45°. A plurality of the first protruding ribs 27 and a plurality of the second protruding ribs 28 are arranged around the cap axis O at 90° apart. The upper surface of each of the first protruding ribs 27 and the second protruding ribs 28 is positioned higher in the radially inner portion than in the radially outer portion. The lower end opening edge of the peripheral wall portion 29 of the lid 13 is arranged on the radially outer portion of each upper surface of the first protruding rib 27 and the second protruding rib 28.

The lower end portion of the inner peripheral surface of the peripheral wall portion 29 of the lid 13 is located at the boundary between the radially inner portion and the radially outer portion on the upper surfaces of the first protruding rib 27 and the second protruding rib 28, In addition, it is in contact with or close to the step portion 33 that faces the outer side in the radial direction.
The first engaging portion 22 is disposed between the first protruding ribs 27 that are adjacent to each other in the circumferential direction without the second protruding rib 28 interposed.

As described above, the first protruding rib 27 has a trapezoidal shape when viewed from above and below, and therefore, after the high temperature contents are filled in the container main body W, the cooling water that has been poured into the cap 1 is stored in the lid 13. Even if it enters between the lower end opening edge of the peripheral wall portion 29 and the upper surface of the top wall portion 12 of the cap main body 11, the air that is blown into the gap causes the introduced cooling water to enter the side surface of the first protruding rib 27. Is guided to and blown outside.

As described above, according to the cap 1 of the present embodiment, the lid 13 can be detachably attached to the inner seal tubular portion 18 that is detachably fitted in the pouring hole 14 and the first tubular portion 15. Since the outer seal tubular portion 19 that is externally fitted and is detachably fitted in the pouring tubular portion 16 is formed, the pouring hole 14 has the inner seal tubular portion 18 and the outer seal tubular portion 19. Since the portion 19 double seals the outside of the cap 1, a high sealing property can be provided without reducing the inner diameter of the spout hole 14 or providing a capping portion as in the conventional case. be able to.
Therefore, at the time of opening, even if the weakened portion is not broken by pulling up the unplugged portion or the like, the pouring hole 14 is opened only by opening the lid 13, and the operability at the time of opening is improved. You can

Since the intake hole 17 is formed in the top wall portion 12 separately from the pouring hole 14, the contents pouring out from the pouring hole 14 hinder the inflow of outside air into the container body W. Can be prevented, and the contents can be smoothly poured out from the pouring hole 14. Since the intake hole 17 is arranged between the first tubular portion 15 and the spouting tubular portion 16, the intake hole 17 can be sealed by the outer seal tubular portion 19.
Since the outer seal tubular portion 19 is in contact with both the outer peripheral surface of the first tubular portion 15 and the inner peripheral surface of the pouring tubular portion 16 and is sandwiched in the radial direction, for example, when the internal pressure of the container body W rises. Due to this, it is possible to prevent the lid 13 from being accidentally detached from the cap body 11.

Since the upper surface of the ceiling wall portion 12 gradually extends downward toward the intake hole 17, even if the content remains on the upper surface of the ceiling wall portion 12 immediately after the content is poured out, When the container body W is in an upright posture, the contents can be flowed through the upper surface of the ceiling wall portion 12 and guided to the intake holes 17 and collected in the container body W.

Since a vertical groove 15a extending over the entire length in the up-down direction is formed on the outer peripheral surface of the first tubular portion 15, when air is supplied from the lower surface side of the ceiling wall portion 12 through the intake hole 17, the air is supplied to the vertical groove 15a. Through the inner wall of the outer seal tube portion 19 and the outer peripheral surface of the outer seal tube portion 19 and the inner peripheral surface of the spout tube portion 16 are insufficiently sealed, the peripheral wall of the lid body 13 Air leaks from between the lower end opening edge of the portion 29 and the upper surface of the top wall portion 12 of the cap body 11. Thereby, the sealability between the outer peripheral surface of the outer seal tubular portion 19 and the inner peripheral surface of the spout tubular portion 16 can be confirmed.

Since the vertical groove 15a extending over the entire length in the vertical direction is formed on the outer peripheral surface of the first tubular portion 15, when air is supplied from the lower surface side of the ceiling wall portion 12 through the pouring hole 14, this air is generated inside. When the seal between the outer peripheral surface of the inner seal tubular portion 18 and the inner peripheral surface of the pouring hole 14 is insufficient, the air flows into the inside of the seal tubular portion 18 and the intake hole 17 passes through the vertical groove 15a. Air flows out. Thereby, the sealability between the outer peripheral surface of the inner seal tubular portion 18 and the inner peripheral surface of the pouring hole 14 can be confirmed.

Since the first engagement portion 22 and the second engagement portion 23 that are detachably engaged with each other are formed on the lid body 13 and the cap body 11, respectively, for example, when the internal pressure of the container body W rises. It is possible to reliably prevent the lid 13 from being accidentally detached from the cap body 11.
The first engaging portion 22 and the second engaging portion 23 are separately formed in portions of the lid 13 and the cap body 11 that are located on the opposite side of the hinge portion 21 that sandwiches the cap shaft O in the radial direction. Therefore, the pulling force around the hinge portion 21 applied to the lid 13 can be effectively transmitted to the first engaging portion 22 and the second engaging portion 23, and the first engaging portion 22, By providing the second engaging portion 23, it is possible to prevent the lid 13 from becoming difficult to open.

Since the lower end portion of the inner peripheral surface of the peripheral wall portion 29 of the lid body 13 is in contact with or close to the step portion 33 on each upper surface of the first protruding rib 27 and the second protruding rib 28, the lid body 13, and A relative radial displacement of the cap body 11 can be suppressed.
A vertical gap is provided between the lower end opening edge of the peripheral wall portion 29 of the lid 13 and a position on the upper surface of the top wall portion 12 where the first protruding rib 27 and the second protruding rib 28 are avoided. Therefore, when the content is poured out from the pouring hole 14, a part of the content drips on the upper surface of the top wall portion 12 to a portion located radially outside the pouring tube portion 16. However, when the lid 13 is closed, the contents can be prevented from scattering outside the cap 1.

The present invention is not limited to the above-described embodiments, but can be modified as appropriate without departing from the spirit of the invention.

For example, in the above-described embodiment, the top surface of the top wall portion 12 has been shown to gradually extend downward as it approaches the air intake hole 17, but the top surface of the top wall portion 12 may be appropriately changed such as to be flat. Good.
Although the lid body 13 shows the hinge cap connected to the cap body 11 via the hinge portion 21, the lid body 13 is not connected to the cap body 11 via the hinge portion 21, and You may employ|adopt the structure etc. which were detachably screwed.
It is not necessary to form the first engaging portion 22 and the second engaging portion 23 on the cap body 11 and the lid 13, and the configurations of the first engaging portion 22 and the second engaging portion 23 are However, the present invention is not limited to the above embodiment, and may be appropriately changed.
Only one of the first protruding rib 27 and the second protruding rib 28 may be formed on the upper surface of the top wall portion 12, or both of them may not be formed.
The inner cylindrical portion 24 and the top wall 25 may not be formed on the top wall portion 12.

Besides, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

1 Cap 11 Cap Main Body 12 Top Wall 13 Lid 14 Pouring Hole 15 First Tube 15a Vertical Groove 16 Pouring Tube 17 Intake Hole 18 Inner Seal Tube 19 Outer Seal Tube 21 Hinge 22 First Engagement Part 23 Second engaging part 27 First protruding rib (projecting rib)
28 Second protruding rib (projecting rib)
29 peripheral wall part 33 step part W container body W1 mouth part

Claims (5)

A capped cylindrical cap body that is attached to the mouth of the container body,
A lid that opens and closes a top wall portion of the cap body,
In the top wall portion, a pouring hole for contents, a first tubular portion that surrounds the pouring hole from the outside in the radial direction, a pouring tubular portion that surrounds the first tubular portion from the outside in the radial direction, and An intake hole located between the first tubular portion and the pouring tubular portion,
An inner seal tubular portion removably fitted in the pouring hole and a detachable external fitting to the first tubular portion, and removably fitted in the pouring tubular portion. And a sealed outer seal tube portion. The cap according to claim 1, wherein an upper surface of the ceiling wall portion gradually extends downward toward the intake hole. The cap according to claim 1, wherein a vertical groove extending over the entire length in the vertical direction is formed on the outer peripheral surface of the first tubular portion. The lid is connected to the cap body via a hinge,
In each of the lid body and the cap body, a first engagement portion and a second engagement portion that are detachably engaged with each other are provided at portions opposite to the hinge portion that sandwiches the cap shaft in the radial direction. The cap according to any one of claims 1 to 3, which is separately formed. On the upper surface of the top wall portion, a plurality of protruding ribs with which the lower end opening edge of the peripheral wall portion of the lid abuts are formed at intervals in the circumferential direction,
The upper surface of the protruding rib, the inner portion in the radial direction is located higher than the outer portion in the radial direction,
The lower end opening edge of the peripheral wall portion of the lid body is arranged on the radially outer portion of the upper surface of the protruding rib,
The lower end portion of the inner peripheral surface of the peripheral wall portion of the lid body is located at the boundary between the radially inner portion and the radially outer portion on the upper surface of the protruding rib, and is in contact with the step portion that faces the radially outer portion. The cap according to any one of claims 1 to 4, which is in contact with or close to.

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