JP6986733B2 - cap - Google Patents

Description

The present invention relates to a cap attached to the mouth of a container.

Conventionally, this type of cap is provided with an inner plug attached to the mouth of the container and an upper lid that can be attached to and detached from the inner plug by rotating. Some have a region, and by attaching the upper lid to the inner plug and rotating it, the thin-walled line is broken, the removal area is fitted into the upper lid, and a spout is formed in the inner plug. According to this cap, when not in use, the inner plug attached to the mouth of the container can be kept sealed, which is hygienic.

However, the size of the upper lid and the inner plug do not change much when viewed in a plan view (for example, both are substantially circular (the upper lid has a substantially cylindrical shape) and their diameters do not change much), and the cutting that cuts the removal area is performed. If the size is relatively large, a relatively large force (large torque) must be applied to the top lid when rotating the top lid to disengage the removal area of the inner plug.

As a method for reducing the force at the time of cutting, for example, as disclosed in Patent Document 1, it is conceivable to cover the upper lid with an overcap having a diameter larger than that of the upper lid. In other words, with the overcap covered on the top lid, a locking portion that can rotate integrally in the radial direction is provided, the overcap is rotated at the time of opening, and the inner top lid is also integrally rotated to remove it. Try to cut the area. As a result, the force (torque) for rotating the overcap at the time of opening can be reduced, and the workability is improved.

Japanese Patent Application Laid-Open No. 2012-126402

However, in the configuration in which the overcap is put on the upper lid as disclosed in Patent Document 1, the upper lid is held in the overcap by the frictional force that radially locks the overcap and the upper lid to each other. In some cases, the top lid may fall off from the overcap.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a cap capable of relatively reducing the rotational force required at the time of opening and at the same time being able to hold the upper lid well in the overcap. It is a thing.

In order to solve the above problems, the present invention has an inner plug attached to the mouth of a container, an upper lid that is rotated and attached to the inner plug, and an upper lid that is covered with the upper lid and is attached to the upper lid when rotated in the circumferential direction. An overcap that is engaged and integrally rotatable is provided, and the inner plug has a middle plug main body and a detachable portion provided so as to be detachable from the inner plug main body via a weakened portion, and is provided on the upper lid. , A cap provided with a rotary engaging portion that engages with the detached portion of the inner plug when the upper lid is rotated, and a flange portion that extends radially outward is formed at the lower end of the side surface portion of the upper lid, and the overcap A covering portion covering the upper lid and a holding foot portion extending downward from the middle cylinder portion extending downward from the covering portion and elastically deformable in the radial direction are provided, and a diameter is provided at the lower end portion of the holding foot portion. It protrudes inward in the direction, and when it is moved downward with respect to the upper lid, it deforms radially outward and can get over the flange part, and when it gets over the flange part, an inner protruding part that locks from below to the flange part of the upper lid is formed. The holding foot portion is formed in a state in which notches are provided at appropriate intervals in the circumferential direction so as to be able to spread outward in the radial direction, and the axial length of the notch portions is the middle of the above. A plurality of outer ridges that are shorter than the axial length of the cylinder and project radially outward are formed on the side surface of the upper lid in the circumferential direction, and are radially formed on the inner surface of the middle cylinder in the overcap. It is characterized in that a plurality of inner ridges that project inward and are rotated in the circumferential direction with respect to the upper lid and engage with the outer ridges of the top lid are formed in the circumferential direction.

In this configuration, when the overcap is put on the upper lid (moving the overcap downward with respect to the upper lid) with the upper lid attached to the inner plug, the medial protrusion formed on the holding foot of the overcap becomes the upper lid. It can be locked from below by overcoming the flange of the. As a result, the top lid can be held in a state where it does not fall off due to the overcap. Then, in this state, by rotating the overcap and integrally rotating the upper lid, the weakened portion of the inner plug can be cut and the detached portion can be detached, and a spout can be formed in the inner plug. At this time, since the overcap is rotated, the rotational force required for cutting the weakened portion can be relatively small.

Further , according to this configuration, the upper lid can be held satisfactorily without falling off due to the overcap.

Further, the inner convex portion is preferable that is provided above places the inner surface of the cutout portion in the in-cylinder unit.

According to the cap of the present invention, a flange portion extending radially outward is formed at the lower end portion of the upper lid, and the overcap has a covering portion covering the upper lid and elastically deformable in the radial direction extending downward from the covering portion. By providing a holding foot portion and forming an inner protruding portion that locks the flange portion of the upper lid from below at the lower end portion of the holding foot portion, the rotational force required for cutting the weakened portion can be relatively small. At the same time, the overcap can hold the upper lid in a state where it does not fall off, and thus the reliability of the cap can be improved.

It is a partial notch front view of the cap which concerns on embodiment of this invention. It is a partial notch front view of the inner plug of the cap. It is a top view of the inner plug of the cap. It is a front view of the detachment part of the inner plug in the cap. It is a partial notch front view of the upper lid of the cap. It is a top view of the upper lid of the cap. It is a bottom view of the upper lid of the cap. It is a partial notch front view of the overcap in the same cap. It is a bottom view of the overcap of the same cap. 9 is an enlarged cross-sectional view taken along the line AA of FIG. It is a partial notch front view which shows the state which puts the upper lid on the inner plug in the same cap. It is a partial notch front view which shows the state which puts an overcap on the upper lid in the same cap. It is a partial notch front view which shows the state which formed the spout by detaching the detaching part from the inner plug by rotating after once attaching an overcap in the same cap. It is a partial notch front view of the cap which concerns on other embodiment of this invention. It is a perspective view seen from the diagonally lower side of the overcap of the same cap. It is a partial notch front view of the cap which concerns on other embodiment of this invention. It is a perspective view seen from the diagonally lower side of the overcap of the same cap. It is a partial notch front view of the cap which concerns on still another embodiment of this invention.

Hereinafter, the cap of the embodiment according to the present invention will be described with reference to the drawings.
In FIG. 1 and the like, reference numeral 1 denotes a cap attached to a container 2 in which a content (content liquid) is housed. The cap 1 is placed on the inner plug 4 attached to the mouth portion 3 of the container 2, the upper lid 5 which is rotated and attached to the inner plug, and the upper lid 5, and engages with the upper lid 5 when rotated in the circumferential direction. It also has an overcap 6 that can rotate integrally. The inner plug 4, the upper lid 5, and the overcap 6 are each manufactured by injection molding with, for example, a synthetic resin, and have an elastically deformable property.

As shown in FIGS. 1 to 4, the inner plug 4 has an inner plug main body 10 and a detachable portion 12 provided so as to be detachable from the inner plug main body 10 via the weakening portion 11. The inner plug main body 10 has a nozzle portion 16 protruding upward from the center (outer circumference of the weakened portion 11), a cylindrical outer cylinder portion 13 whose lower portion fits into the mouth portion 3 of the container 2 from the outside, and an outer cylinder portion. A cylindrical inner cylinder portion 14 provided with a gap on the inner circumference of 13 and the lower portion of which is fitted into the mouth portion 3 of the container 2 from the inside, and upper end portions of the outer cylinder portion 13 and the inner cylinder portion 14, respectively. The upper surface portion 15 that extends inward in the radial direction and connects the outer cylinder portion 13 and the inner cylinder portion 14, and the upper surface portion 15 protrudes upward from the inner peripheral end of the upper surface portion 15 in a stepped shape (cylindrical shape) and at the inner peripheral side portion. A step portion 17 and the like connected to the entire circumference of the nozzle portion 16 are formed at a substantially central portion in the height direction.

Further, below the outer cylinder portion 13, a flange-shaped portion 18 that extends downward through the thin-walled portion 19A and projects radially outward and inner peripheral sides is formed on the entire circumference, and after the container 2 is used or the like. The flange-shaped portion 18 is cut from the vertical thin-walled groove portion 19B and the thin-walled portion 19A formed in one place of the flange-shaped portion 18, so that the inner plug 4 and the like can be easily removed from the container 2. Further, on the outer periphery of the step portion 17 of the inner plug main body 10, a screw portion 20 screwed to a screw portion 31 (see FIGS. 1, 5, etc.) to be described later formed on the upper lid 5 is formed, and the inner plug main body 10 is formed. A plurality of stopper portions 21 are formed on the upper surface portion 15 of the above surface so as to be able to come into contact with the regulation ribs 43 (see FIGS. 5, 7 and the like) formed on the upper lid 5 so as to recognize the rotationally closed position of the upper lid. It is provided at two locations (two locations in this embodiment).

As shown in FIGS. 2 to 4, the detaching portion 12 of the inner plug 4 is a cylindrical central side surface portion 22 extending upward from the outer periphery of the weakened portion 11 and a portion slightly below the upper end portion of the central side surface portion 22. It has an apical sealing portion 23 that closes the inner peripheral side of the central side surface portion 22. Further, on the central side surface portion 22 of the detachment portion 12, the detachment portion side ridge ribs 24 extending vertically in a state of projecting outward in the radial direction are provided at predetermined angles in the circumferential direction (in this embodiment, every 60 degrees in the circumferential direction). A plurality of the protruding portion side ridge ribs 24 are formed on the inner circumference of the central tubular portion 33 of the upper lid 5 at predetermined angles in the circumferential direction (in this embodiment, every 60 degrees in the circumferential direction). The ridge rib 32 (see FIGS. 5 and 7) is engaged with the upper lid 5 when the upper lid 5 is rotated in the circumferential direction with respect to the inner plug 4. Further, a concave portion 25 recessed on the inner peripheral side is formed at an outer peripheral portion slightly below the upper end portion of the central side surface portion 22.

As shown in FIGS. 1 and 5 to 7, the upper lid 5 has a substantially circular top plate portion 36, a cylindrical side surface portion 37 hanging from the outer peripheral edge of the top plate portion 36, and a top plate portion. The lid cylindrical portion 38 hanging from the inner peripheral side of the outer peripheral edge of 36, the inner cylinder portion 39 formed on the inner peripheral side of the lid cylindrical portion 38 and hanging from the top plate portion 36, and the inner cylinder portion 39. It has a central tubular portion 33 and the like that are formed on the inner peripheral side and hang down from the top plate portion 36.

The lower end of the lid cylindrical portion 38 can be brought into contact with the upper surface portion 15 of the inner plug 4 from above when the upper lid 5 is put on the inner plug 4, and the screw of the inner plug 4 is formed on the inner circumference of the lid cylindrical portion 38. A screw portion 31 to be screwed into the portion 20 is formed. The inner cylinder portion 39 comes into close contact with the nozzle portion 16 of the inner plug 4 from the inner peripheral side when the upper lid 5 is put on the inner plug 4.

As described above, the central cylindrical portion 33 of the upper lid 5 has an upper lid side as a rotationally engaging portion on the inner circumference at predetermined angles in the circumferential direction (as described above, every 60 degrees in the circumferential direction in this embodiment). A plurality of ridge ribs 32 are formed, a central tubular base 34 is formed above the central tubular portion 33 of the upper lid 5 (the base of the central tubular portion 33), and the inside of the central tubular base 34 is further formed. A convex portion 35 projecting to the peripheral side is formed. Then, when the upper lid 5 is put on the inner plug 4, the central cylindrical portion 33 of the upper lid 5 is fitted to the central side surface portion 22 of the detaching portion 12 of the inner plug 4 from the outside in the radial direction, and the detaching portion 12 of the inner plug 4 is fitted. The convex portion 35 formed in the central tubular base portion 34 of the upper lid 5 is fitted to the concave portion 25 formed in the above.

Further, on the inner circumference of the side surface portion 37 of the upper lid 5, there are a plurality of regulation ribs 43 in the circumferential direction that can come into contact with the stopper portion 21 of the inner plug 4 when the upper lid 5 is closed with respect to the inner plug 4. It is provided at (two places in this embodiment).

On the side surface portion 37 of the upper lid 5, an outer ridge portion 41 projecting outward in the radial direction (in this embodiment, projecting outward in the radial direction so as to have a saw blade shape in a plan view) is provided with respect to the circumferential direction. A plurality of the flange portions 42 are continuously formed, and a flange portion 42 extending outward in a flange shape is formed at the lower end portion of the side surface portion 37. Further, in this embodiment, an inclined surface 42a is formed on the upper portion of the flange portion 42 so as to gradually expand radially outward (diametrically outward) from the side surface portion 37 downward.

As shown in FIGS. 1, 8, 9, 9 and the like, the overcap 6 includes a covering portion 51 that covers the upper lid 5, a middle cylinder portion 52 that extends downward from the inside of the upper portion of the covering portion 51, and the middle cylinder portion 52. A plurality of elastically deformable holding foot portions 53 extending further downward from the middle cylinder portion 52 (that is, extending downward from the covering portion 51 via the middle cylinder portion 52), and radially inward from the middle cylinder portion 52. A plurality of inner ridges 54 are formed so as to project toward the top and engage with the outer ridges 41 of the upper lid 5. In this embodiment, the covering portion 51 is composed of a flat disk-shaped top surface portion 51A and an outer peripheral surface portion 51B that gently spreads downward from the outer peripheral edge of the top surface portion 51 and extends downward in a tubular shape. The diameter of the outer peripheral surface portion 51B is larger than the diameter of the upper lid 5 and the inner plug 4.

Further, in this embodiment, the middle cylinder portion 52 is provided so as to extend downward in a cylindrical shape from the connection portion between the top surface portion 51A and the outer peripheral surface portion 51B in the cover portion 51 or a portion in the vicinity thereof. Then, in the region below the middle cylinder portion 52, the long groove notch 55A and the short groove notch 55B are alternately provided at appropriate angles in the circumferential direction, and these long groove notch 55A and the short groove notch 55B are provided. The portion between them is the holding foot portion 53. That is, the positions of the lower ends of all the holding feet 53 are substantially the same in the vertical direction, but the long groove notch 55A is cut above the short groove notch 55B. Since the long groove notch 55A or the short groove notch 55B is provided between the adjacent holding feet 53, the holding foot 53 is elastic in the radial direction in a plan view. It is said to be deformable. Further, in this embodiment, the inner ridge portion 54 is provided on the inner surface of the upper portion of the short groove notch portion 55B in the middle cylinder portion 52. That is, the short groove notch portion 55B and the inner convex strip portion 54 are provided at positions where they overlap in the radial direction in a plan view.

As shown in an enlarged manner in FIG. 10, the lower end of the holding foot portion 53 projects radially inward, and when the overcap 6 is moved downward with respect to the upper lid 5, it deforms outward and the upper lid 5 It is possible to get over the flange portion 42 of the above, and when it gets over the flange portion 42, an inner protruding portion 56 that locks from below to the flange portion 42 of the upper lid 5 is formed. In this embodiment, a lower inclined surface 56a extending radially outward is formed in the lower portion of the inner protruding portion 56, and an upper inclined surface 56b extending radially outward is formed in the upper portion of the inner protruding portion 56. Has been done. Further, a lower inclined surface 54a is also formed at the lower end of the inner ridge portion 54 so as to extend outward in the radial direction toward the lower side (in this embodiment, the lower end surface 54a expands in a shape that bulges inward).

Next, the operation including the procedure for assembling the inner plug 4, the upper lid 5, and the overcap 6 in the cap 1 in the above configuration will be described.
First, the procedure for assembling the inner plug 4 and the upper lid 5 in the cap 1 will be described. After the inner plug 4 and the upper lid 5 are manufactured separately, in an unused state where the detaching portion 12 is provided on the inner plug main body 10, the upper lid 5 is moved downward with respect to the inner plug 4 as shown in FIG. The upper lid 5 is attached to the inner plug 4 by moving (that is, moving in the direction of combining with each other along the axial direction X of the cap 1). At this time, a jig (not shown) is fitted inside the inner plug 4, and the upper lid 5 is plugged downward (driving) from above the inner plug 4.

As a result, in the lower region of FIG. 12, the inner cylinder portion 39 shows the state in which the inner plug 4 and the upper lid 5 are assembled (however, FIG. 12 shows the assembled state of the overcap 6 after this). Is inserted inside the upper part of the nozzle portion 16 of the inner plug 4, and the top plate portion 36 of the upper lid 5 comes into contact with the upper end surface of the detaching portion 12. Further, the threaded portion 31 of the upper lid 5 gets over the threaded portion 20 of the inner plug 4, and the detached portion 12 enters and is held in the central tubular portion 33, and is held in the concave portion 25 provided at the tip portion of the detached portion 12. The convex portion 35 provided on the central tubular base portion 34 of the upper lid 5 is fitted. Further, the upper lid side ridge rib 32 is inserted between the detached portion side ridge ribs 24, and the upper lid 5 is attached to the inner plug 4 in such a state.

At this time, as shown in the lower regions of FIGS. 1 and 12, as described above, the top plate portion 36 of the upper lid 5 abuts on the upper end surface of the detaching portion 12, so that the upper lid side ridge rib 32 is formed. It is not excessively inserted between the ridge ribs 24 on the detached portion side, and the tip of the ridge rib 32 on the upper lid side does not abut on the weakened portion 11 and break.

Next, as shown in FIG. 12, the overcap 6 is moved downward with respect to the upper lid 5 to which the inner plug 4 is assembled (that is, the upper lid 5 and the overcap are along the axial direction X of the cap 1). (Move in the direction of combining with each other), and attach the overcap 6 to the upper lid 5. At this time, the overcap 6 is tapped (drived) downward from above the upper lid 5 while maintaining the state in which the jig (not shown) is inserted inside the inner plug 4.

As a result, as shown in FIG. 1, the side surface portion 37 of the upper lid 5 is in contact with the side surface portion 37 and the outer ridge portion 41 of the upper lid 5 while the inner convex portion 54 of the overcap 6 is in contact with the side surface portion 37 of the upper lid 5. The inner ridge portion 54 of the overcap 6 is inserted between the outer ridge portions 41 formed on the side surface portion 37 of the upper lid 5 while being fitted into the holding foot portion 53 and the middle cylinder portion 52. Then, when the overcap 6 is further tapped (drived) downward from above the upper lid 5, the inner protruding portion 56 formed on the holding foot portion 53 of the overcap 6 gets over the flange portion 42 of the upper lid 5 and the flange portion. Lock 42 from below. As a result, the overcap 6 can hold the upper lid 5 in a good condition without falling off. In this embodiment, the flange portion 42 of the upper lid 5 is formed with an inclined surface 42a, and the inner protruding portion 56 of the overcap 6 is formed with a lower inclined surface 56a (see FIG. 10). The inner protruding portion 56 of the overcap 6 can satisfactorily get over the flange portion 42 of the upper lid 5.

Then, in this state, when the overcap 6 is rotated around the axis (in this embodiment, the overcap 6 is rotated counterclockwise with respect to the upper lid 5 in a plan view), the inside of the overcap 6 is rotated. The ridge portion 54 abuts on the outer ridge portion 41 of the upper lid 5, the upper lid 5 is integrally rotated together with the overcap 6, and the upper lid side ridge rib 32 is attached to the detached portion side ridge rib 24 of the inner plug 4. Upon contact, the detaching portion 12 of the inner plug 4 is integrally rotated together with the upper lid 5. As a result, the weakened portion 11 of the inner plug 4 can be cut to separate the detaching portion 12 from the inner plug main body 10, and the spout 26 (see FIG. 13) can be formed in the inner plug 4. At this time, since the overcap 6 having a large diameter is rotated, the rotational force required at the time of opening can be reduced. That is, even when the cutting distance of the weakened portion 11 and the opening area of the spout 26 (see FIG. 13) are relatively large, it is convenient to be able to cut without applying a large force.

Here, as shown in FIGS. 8 to 10, the holding foot portion 53 is inserted from the covering portion 51 of the overcap 6 (in this embodiment, the connecting portion between the top surface portion 51A and the outer peripheral surface portion 51B). A plurality of notches (long groove notch 55A and short groove notch 55B) are provided at appropriate intervals in the circumferential direction while extending downward via the tubular portion 52 so as to be able to spread outward in the radial direction. (In particular, in this embodiment, a large number of holding foot portions 53 are provided via the long groove notch 55A and the short groove notch 55B), so that the overcap 6 does not cause the upper lid 5 to fall off. Can be retained.

Further, a plurality of outer convex strips 41 projecting radially outward are formed on the side surface portion 37 of the upper lid 5 in the circumferential direction, and the overcap 6 projects radially inward in the circumferential direction with respect to the upper lid 5. Since a plurality of inner convex portions 54 that engage with the outer convex portion 41 of the upper lid 5 when rotated are formed in the circumferential direction, the upper lid 5 is satisfactorily rotated integrally when the overcap 6 is rotated. It is suitable because it can be done.

Further, in the present embodiment, since the inner ridge portion 54 is provided on the inner surface of the upper portion of the notch portion (short groove notch portion 55B) in the middle cylinder portion 52, the inner ridge portion 54 is relatively vertically up and down. The length can be made so that it can be satisfactorily engaged with the outer convex portion 41 of the upper lid 5, and at the same time, the holding foot portion 53 can be prevented from being easily deformed in the radial direction, and the holding foot portion can be prevented. The 53 allows the flange portion 42 to be satisfactorily overcome.

Further, in the present embodiment, since the overcap 6 is provided with the bottom surface portion 51A having a flat upper surface portion, when the cap 1 is opened and the upper lid 5 and the overcap 6 are removed from the container 2, the overcap is capped. There is also an advantage that 6 can be stably placed on a table or the like.

In the above embodiment, a long groove notch 55A and a short groove notch 55B, which are groove-shaped notches, are provided between the holding foot 53 in the circumferential direction of the overcap 6, and these long groove notches 55A are provided. The case where a large number of holding foot portions 53 are provided via the short groove notch 55B and the short groove notch 55B is described, but the present invention is not limited to this. That is, as shown in FIGS. 14 and 15, a plurality of holding foot portions 53 are provided between the holding foot portions 53 in the circumferential direction via a wide notch (wide notch 55C) in the circumferential direction. You may.

Further, the flange portion 42 provided on the upper lid 5 does not necessarily have to be provided with an inclined surface 42a on the upper portion, and as shown in FIGS. 14 and 15, the flange portion 42 is simply radially outward from the lower end of the side surface portion of the upper lid 5. It may be formed so as to spread.

Further, in the above embodiment, the inner ridge portion 54 is provided on the inner surface of the middle cylinder portion 52 extending downward from the covering portion 51 of the overcap 6, and the holding foot portion extends further downward from the middle cylinder portion 52. 53 is provided. However, the present invention is not limited to this configuration, and as shown in FIGS. 16 and 17, the first middle cylinder portion 52A extending downward from the covering portion 51 of the overcap 6 and the first middle portion of the covering portion 51 of the overcap 6 A second middle cylinder portion 52B extending downward from a portion on the outer peripheral side of the portion to which the cylinder portion 52A is connected is provided, an inner convex portion 54 is provided on the first middle cylinder portion 52A, and a second middle cylinder portion is provided. The holding foot portion 53 may be provided so as to extend downward from the 52B. In this embodiment, the upper lid 5 is provided with a large-diameter side surface portion 37A extending radially outward and downward from the lower end portion of the side surface portion 37 provided with the outer convex strip portion 41, and the large-diameter side surface portion 37A is provided. A flange portion 42 is provided that simply extends outward in the radial direction from the lower end of the above.

Further, in the above embodiment, the case where the top surface portion 51A having a flat upper surface portion is provided as the covering portion 51 of the overcap 6 is not limited to this, but as shown in FIG. As the covering portion 51, a spherical surface portion 51C having a simple hemispherical upper surface portion thereof and an outer peripheral surface portion 51B that gently follows the spherical surface portion 51C may be used. Further, the middle cylinder portion 52 is preferably circular in a plan view, but the covering portion 51 may have a rectangular shape (such as a quadrangle or a hexagon) in its planar shape.

Further, in the above embodiment, the case where the upper lid 5 is covered with the overcap 6 is described, but for example, when the spout is made into the inner plug, the spout can be formed relatively easily. It is possible to form a cap with the inner plug 4 and the upper lid 5 having the above-mentioned configuration without having the overcap 6.

1 Cap 2 Container 3 Mouth 4 Inner plug 5 Top lid 6 Overcap 10 Inner plug body 11 Weakened part 12 Departure part 13 Outer cylinder part 14 Inner cylinder part 16 Nozzle part 24 Departure part side ridge rib 26 Injection outlet 32 Top lid side protrusion Strip rib (rotational engagement part)
33 Central tubular part 36 Top plate part 37 Side part 39 Inner cylinder part 41 Outer convex part 42 Flange part 51 Covering part 51A Top surface part 51B Outer surface part 52 Middle cylinder part 52A First middle cylinder part 52B Second middle cylinder part 53 Holding foot 54 Inner ridge 55A Long groove notch 55B Short groove notch 55C Wide notch 56 Inside protrusion 56

Claims (2)

An inner plug attached to the mouth of the container, an upper lid that rotates and is attached to the inner plug, and an overcap that is placed on the upper lid and engages with the upper lid when rotated in the circumferential direction and can rotate integrally. The inner plug has a main body of the inner plug and a detaching portion provided so as to be detachable from the main body of the inner plug via a weakened portion. A cap provided with a rotary engaging portion that engages the portion.
A flange portion that extends radially outward is formed at the lower end of the side surface portion of the upper lid.
The overcap is provided with a covering portion that covers the upper lid and a holding foot portion that extends downward from the middle cylinder portion extending downward from the covering portion and is elastically deformable in the radial direction.
It protrudes inward in the radial direction at the lower end of the holding foot, and when it is moved downward with respect to the upper lid, it deforms outward in the radial direction and can get over the flange part, and when it gets over the flange part, it becomes the flange part of the upper lid. An inner protrusion that locks from below is formed ,
The holding foot portions are formed in a state in which notches are provided at appropriate intervals in the circumferential direction so as to be able to spread outward in the radial direction.
The axial length of the notch is shorter than the axial length of the middle cylinder.
On the side surface of the upper lid, a plurality of outer ridges protruding outward in the radial direction are formed in the circumferential direction.
On the inner surface of the middle cylinder portion in the overcap, there are a plurality of inner convex portions that engage with the outer convex portions of the upper lid when they project radially inward and are rotated in the circumferential direction with respect to the upper lid. A cap characterized by being formed. The inner convex portion, a cap according to claim 1, characterized in that provided above places the inner surface of the cutout portion in the in-cylinder unit.

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