JP2001192049A - Synthetic resin cap and closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin cap which can demonstrate excellent tamper evidence, and its closing device. SOLUTION: A cap body 4 comprises a top plate 2 and a cylindrical portion 3 suspended from a circumferential edge thereof, the cylindrical portion 3 is demarcated into a main portion 8 above a horizontal score 6 and a tamper evidence ring portion 9 therebelow by the horizontal score 6, a threaded portion 10 to be screwed with a male screw 22 of a container mouth 21a is formed on an inner wall surface of the main portion 8, a large number of uneven tabs 11 protruded in a plate-like manner are provided on the inner wall surface of the tamper evidence ring portion 9 along the circumferential direction, and a recess 13 of arc-shaped section along the outer circumferential shape of the container mouth 21a is formed on the inner circumferential side of the tabs 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closure device comprising a container and a tamper-evident synthetic resin cap for closing the mouth of the container, and a synthetic resin cap for the closure device.

[0002]

2. Description of the Related Art FIG. 12 shows an example of a conventional synthetic resin cap. A cap 31 shown in FIG. 12 includes a cap body 4 having a circular top plate portion 2 and a cylindrical portion 3 hanging down from the periphery thereof. A cylindrical portion 3 connected to an upper main portion 8 by a horizontal score 6 and a lower end of the main portion 8 by a number of narrow bridges 7. A plurality of thin tabs 32 are provided on the inner wall surface of the TE ring portion 9 so as to be able to undulate over the entire circumference.

[0003] The cap 31 is connected to the mouth 21 of the container 21.
When the cap 32 is turned in the opening direction from the state of being attached to the a, the tab 32 provided on the inner surface of the TE ring portion 9 is engaged with the annular bulging portion 23, so that the main portion 8 of the cap main body 4 rises with rotation. On the other hand, the TE ring portion 9 is prevented from moving upward, and as a result, a tensile force acts on a large number of thin bridges 7 connecting the main portion 8 and the TE ring portion 9, and these bridges 7 break. , TE ring section 9 is separated from main section 8. When the TE ring 9 is separated, the cap 3
It is clearly indicated that 1 has been opened.

[0004]

However, in the above prior art, when the plug is opened, the locking of the tab 32 to the annular bulging portion 23 becomes insufficient, and a large force is locally applied to the locking portion of the tab 32. , The tab 32 is deformed, and the tab 32 may be detached from the annular bulging portion 23, and the separation of the TE ring portion 9 may be insufficient. Therefore, improvement is desired from the viewpoint of improving tamper evidence. Was. The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a synthetic resin cap and a closing device that can exhibit excellent tamper evidence.

[0005]

According to the present invention, there is provided a synthetic resin cap comprising a cap body comprising a top plate and a tube hanging down from the periphery thereof, wherein the tube is provided with a weakening line and a portion above the weakening line. And a lower part of the tamper-evidence ring portion, and a threaded portion is formed on the inner wall surface of the main portion to be screwed into the external thread of the container mouth, and the inner wall surface of the tamper-evidence ring portion has a plate shape. A large number of tabs are provided along the circumferential direction so as to protrude and undulate, and a recess is formed on the inner peripheral side of the tab along the outer peripheral shape of the container opening. The closing device of the present invention, the cap made of a synthetic resin, includes a cap body composed of a top plate portion and a tubular portion hanging down from the periphery thereof, the tubular portion being a weakening line, and a main portion above the weakening line, It is partitioned into a lower tamper evidence ring portion, a screw portion is formed on the inner wall surface of the main portion to be screwed with a male screw of the container mouth portion, and protrudes and undulates on the inner wall surface of the tamper evidence ring portion in a plate shape. A large number of tabs are provided along the circumferential direction, a depression is formed on the inner peripheral side of the tab along the outer peripheral shape of the container mouth, and the container has a male screw formed on the outer periphery of the mouth. An annular bulge is formed below the screw to lock the tab when opening the cap body attached to the container mouth and to prevent movement of the tamper evidence ring. I do. Further, in the closing device of the present invention, the synthetic resin cap includes a cap main body including a top plate portion and a tubular portion hanging down from the periphery thereof, and the tubular portion is formed by a weakening line, and a main portion above the weakening line. , Is partitioned into a lower tamper evidence ring portion, a screw portion is formed on the inner wall surface of the main portion to be screwed with a male screw of the container mouth portion, and is protruding and undulating on the inner wall surface of the tamper evidence ring portion. A large number of tabs are provided along the circumferential direction, a depression is formed on the inner peripheral side of the tab along the outer peripheral shape of the container opening,
The container has a male screw formed on the outer periphery of its mouth, an annular bulge formed below the male screw, and the bulge has the synthetic resin cap attached to the container mouth. When turned in the opening direction, the tab of the cap is pressed down, and a pressing portion having an inclined surface that gradually bulges downward in the cap opening direction is formed. Good. In addition, an extension step portion that engages with the tab pushed down by the inclined surface and prevents the tab from being moved upward can be connected to the pressing portion. The opposite side of the inclined surface of the extension step portion may be a storage guide surface that gradually reduces the protruding height in the cap opening direction.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 show an embodiment of a closing device according to the present invention.
The cap comprises a synthetic resin cap (hereinafter abbreviated as a cap) 1 which is one embodiment of the synthetic resin cap of the present invention, and a container 21. The cap 1 includes a cap main body 4 having a circular top plate portion 2 and a cylindrical portion 3 hanging down from the periphery thereof, and a substantially disk-shaped liner 5 fixed to the inner surface of the top plate portion 2. The cylindrical portion 3 has a main portion 8 above the horizontal score 6 by a horizontal score 6 which is a weakening line.
And a tamper evidence ring (hereinafter referred to as TE ring) 9 connected to the lower end of the main part 8 by a large number of narrow bridges 7. A screw portion 10 is formed on an inner peripheral wall surface of the main portion 8. On the inner wall surface of the TE ring portion 9, a large number of tabs 11 that protrude and undulate in a plate shape are provided along the circumferential direction.

In the cap 1 of the present embodiment, the tab 1
A recess 13 having an arc-shaped cross section is formed on the inner peripheral side of 1. The arc-shaped recess 13 is formed so as to have a shape along the outer peripheral shape of the portion of the opening 21 a where the tab 11 contacts when the cap 1 is mounted on the opening 21 a of the container 21. As the material of the cap body 4, polypropylene, high-density polyethylene, or the like can be used.

The container 21 is made of a synthetic resin material such as polyethylene terephthalate (PET) or glass, and has a
A male screw 22 is formed on the outer periphery of 1a, an annular bulge 23 is provided below the male screw 22 in the circumferential direction, and a flange 29 is formed below the annular bulge 23. ing.

Next, the operation of the closing device will be described. After the container 21 is filled with a desired content liquid, the container 21 is conveyed to a cap mounting device (not shown) to support the lower surface of the flange portion 29, preferably while being conveyed in a suspended state,
The cap 1 is put on 1a and screwed.

In the mounting process, the tab 1 of the cap 1
1 has an annular bulging portion 23 with its tip folded upward.
Pass through. In the cap 1, since the arc-shaped depression 13 is formed on the inner peripheral surface of the tab 11, the tab 11 is pressed radially outward by the annular bulging portion 23 in the mounting process, and the tip is When moving and folding,
The annular bulge 23 fits into the arc-shaped recess 13. For this reason, the amount of radial displacement of the tab 11 when the tab 11 is folded is smaller than in the case where the arc-shaped recess 13 is not formed.

This will be described with reference to FIGS. As shown in FIG. 5, the tab 11 has an arc-shaped recess 13.
5 when the cap 1 is not mounted (FIG. 5).
Tab 11 from (a)) to the time of folding (FIG. 5 (b))
The amount of displacement of the tip of (a) in FIG. 5 (symbol a in FIG. 5) becomes small because the annular bulging portion 23 is fitted into the arc-shaped recess 13 when folded. On the other hand, as shown in FIGS. 6 and 7, when the cap is not attached to the cap (the tab 32 has a flat inner peripheral surface (see FIG. 7)) in which the arc-shaped recess is not formed (see FIG. 7). The displacement amount (reference numeral b in FIG. 6) of the tip of the tab 32 from FIG. 6A to the time of folding (FIG. 6B) is relatively large.

When the cap 1 is further turned in the closing direction, the tab 11 reaches below the annular bulging portion 23, and the opening end of the container opening 21a reaches the liner 5.
Is sealed.

As shown in FIG. 4, in the cap 1, an arc-shaped recess 13 is formed on the inner peripheral surface of the tab 11 along the outer peripheral shape of the container opening 21a.
In the state of being mounted on the container a, the container opening 21a is fitted into the arc-shaped recess 13, and the tab 11 abuts on the container opening 21a in the circumferential direction.

Next, the operation of the closing device with the cap 1 attached to the container opening 21a when the cap is opened will be described with reference to FIGS. 1 to 4 and also to FIG. Cap 1
When the is turned in the opening direction and raised, the tab 11 contacts the lower surface of the annular bulging portion 23. At this time, the area of the portion where the tab 11 abuts on the annular bulging portion 23 is larger than that of a cap in which the tab is not formed with an arc-shaped depression (the tab has a flat inner peripheral surface).

That is, as shown in FIG. 4, when the tab 11 is formed with an arc-shaped recess 13 along the outer peripheral shape of the container opening 21a, the tab 11 is formed as shown by reference numeral c in FIG. Since the tab 11 abuts on the container opening 21a in the direction, the area of the portion where the tab 11 abuts on the annular bulge 23 is increased. On the other hand, as shown in FIG. 8, the cap 3 having the tab 32 in which the arc-shaped recess is not formed.
In the case of 1, since the tab 32 is in contact with the container opening 21a only at a portion substantially at the center in the circumferential direction (reference numeral d in the figure), both ends 32a of the tab 32 in the circumferential direction are connected to the container opening 21a.
In a state separated from the outer peripheral surface. Thus, tab 3
(2) Since the portions near both ends of the distal end portion are located more radially outward, the area of the portion where the tab 32 contacts the annular bulging portion 23 is reduced.

When the cap 1 is further turned in the opening direction, the tab 11 is engaged with the annular bulging portion 23 and the upward movement of the TE ring portion 9 is prevented, while the main portion 8 of the cap body 4 is rotated according to the rotation. And as a result, the main part 8 of the cap and TE
Tensile force acts on a large number of narrow bridges 7 connecting the ring portions 9, and these bridges 7 break, which clearly indicates that the TE ring portion 9 has been separated from the main portion 8 and opened.

In the closing device of the present embodiment, since the arc-shaped recess 13 is formed on the inner peripheral surface of the tab 11 of the cap 1 along the outer peripheral shape of the container opening 21a, it is attached to the container opening 21a. In this state, the tab 11 contacts the container opening 21a in the circumferential direction. For this reason, at the time of opening, the area of the portion where the tab 11 abuts on the annular bulging portion 23 increases, and the drag received by the tab 11 from the annular bulging portion 23 is not concentrated locally, but is dispersed. Deformation is less likely to occur. Therefore, even if the dimensional accuracy of the container 21 (for example, the accuracy of the diameter of the annular bulging portion 23) varies, the tab 11 is not opened when the container is opened due to the deformation of the tab 11.
Can be prevented from coming off from the annular bulging portion 23 and the TE ring portion 9 can be cut off and defective. Therefore, tamper evidence can be improved.

In the process of attaching the cap 1 to the container opening 21a, when the tab 11 is pressed radially outward by the annular bulging portion 23, and moves in the radial direction and is folded, the tab 11 is formed into an annular recess 13 in an annular shape. Since the bulging portion 23 is fitted, the radial displacement of the tab 11 is smaller than that of a type having a tab having no arc-shaped depression. Therefore, the repulsive force of the tab 11 against the force in the folding direction is suppressed low, and the resistance when the tab 11 gets over the annular bulging portion 23 is reduced. Therefore, the tightening torque can be reduced. In addition, since the amount of displacement of the tab 11 during the mounting process can be reduced, the radial force applied to the TE ring portion 9 by the tab 11 is also reduced. Therefore, it is possible to prevent the bridge 7 from being cut by the force applied to the TE ring portion 9 at the time of mounting.

FIG. 9 shows another embodiment of the closing device according to the present invention. In the closing device shown here, the cap mounted on the annular bulging portion 23 of the container 51 is attached to the container opening 51a. When the cover 1 is turned in the opening direction, the pressing portion 24 engages with the tab 11 of the cap 1 and presses the tab 11 down, and the pressing portion 24 is connected to the pressing portion 24 and is engaged with the tab 11 pressed down by the pressing portion 24. In addition, a plurality of bridge extending means 26 including a horizontal extension step portion 25 for preventing the upward movement thereof are provided in the circumferential direction. The number of bridge stretching means is not limited to this embodiment, and may be one or more.

The pressing portion 24 has an inclined surface that gradually bulges downward in the cap opening direction when the tab 11 comes into contact when the cap is opened. The surface on the opposite side of the inclined surface of the extension step portion 25 is a storage guide surface 27 that gradually reduces the protruding height in the cap opening direction.

The inclination angle of the pressing portion 24 with respect to the annular bulging portion 23 is preferably 5 to 50 degrees. This angle is 50
If the degree is larger than that, when turning the cap 1 attached to the container opening 51a in the opening direction, the resistance when the tab 11 is pushed down becomes strong, and the tab 11 may not be pushed down. If this angle is smaller than 5 degrees, B.B. B. A. (When the cap attached to the container mouth is turned from the closing position to the opening direction, the rotation angle from the position at which the bridge is cut becomes large), which is not preferable from the viewpoint of tamper evidence.

The length from the annular bulge 23 to the extension step 25 is about 0.5 to 4.0 mm. If this length is smaller than 0.5 mm, the effect of pressing down the tab at the time of opening is not sufficiently exhibited, and B.B. B. A. Is increased, and if this length is larger than 4.0 mm, the excess portion becomes large, which is disadvantageous in cost.

The length of the horizontal portion of the extension step 25 is 3 to
10 mm. If this length is smaller than 3mm,
B. B. A. Will increase and this length will be 10m
If it is larger than m, the excess portion becomes large, which is disadvantageous in cost. The length of the pressing portion 24 (length of the inclined portion) is 1.5.
８8 mm. If the length of the inclined portion is smaller than 1.5 mm, the effect of pressing down the tab at the time of opening is not sufficiently exhibited, and if it is larger than 8 mm, the excess portion becomes large, which is disadvantageous in cost. The inclination angle of the storage guide surface 27 is 1
5 to 60 degrees.

Next, the operation of the closing device will be described. When the cap 1 is attached to the container mouth 51a, the bridge extending means 26 is attached in the attached state at the final stage of attachment.
The tab 11 overlaps with the annular swelling portion 23 and is slightly opened radially inward so as to abut on the outer peripheral surface of the container opening below the annular swelling portion 23.
In contact with the storage guide surface 27. Bridge stretching means 2
6 is formed with a storage guide surface 27 that gradually reduces the protruding height in the cap opening direction, so that when the tab 11 contacts the storage guide surface 27 and moves in the closing direction, the tab 11 is stored. Since the tip is folded upward along the inclination of the guide surface 27, a large force is not applied to the bridge 7.

When the cap 1 attached to the container opening 51a is turned in the opening direction, the cap 1 is rotated to move the pressing unit 2 of the bridge extending means 26 formed in the container opening 51a.
The tab 11 comes into contact with the tip 11 at a portion 11 a on the opening direction side of the tip portion, and this portion 11 a is gradually pushed down according to the inclination of the pressing portion 24. When the tab 11 is pushed down, the main portion 8 and the TE ring portion 9 start to be separated from each other immediately after the cap 1 starts rotating in the opening direction, and a plurality of thin portions connecting the main portion 8 and the TE ring portion 9 are formed. A tensile force is applied to the bridge 7.

When the tab 11 is depressed by the pressing portion 24, the tab 11 is moved around the container
Therefore, the length of the portion 11a of the tab 11 that contacts the pressing portion 24 is sufficiently large.

This will be described with reference to FIGS. That is, as shown in FIG. 10, in the case of the cap 1 in which the arc-shaped recess 13 is formed in the tab 11,
Since the tab 11 contacts the container opening 51a in the circumferential direction, the end 11b of the tab 11 comes into contact with the container opening 51a. For this reason, the length (the length e shown in FIG. 10A) of the contact portion 11a of the tab 11 with the pressing portion 24 is sufficiently large.

On the other hand, as shown in FIG.
Cap (tab 3) having no arc-shaped recess
In the case of (2) whose inner peripheral surface is flat) 31, the tab 32 comes into contact with the container opening 51a only at a substantially central portion (reference numeral d in the figure) in the circumferential direction. The portion 32b on the direction side is separated from the side surface of the container opening 51a. Therefore, the portion 32c in contact with the pressing portion 24
(The length f shown in FIG. 11A) is relatively small.

As described above, in the cap 1, the tab 11
However, since the portion having a sufficient length abuts on the pressing portion 24, the force applied to the tab 11 by the pressing portion 24 at the time of opening is dispersed, and the deformation of the tab 11 becomes difficult.

The tab 11 which has been pressed down along the inclined surface of the pressing portion 24 and rotated on the lower surface side of the pressing portion 24 smoothly moves to a horizontal extension step 25 connected to the pressing portion 24. When the tab 11 reaches the extension step 25,
While the TE ring portion 9 is pushed down, the main portion 8 rises along the male screw 22, so that a tensile force in the longitudinal direction (vertical direction in the drawing) is further applied to the bridge 7, and the bridge 7 is stretched and cut. It becomes thin or thread-like.

After the tab 11 shifts from the pressing portion 24 to the extension step portion 25, the pressing of the TE ring portion 9 is stopped, but the main portion 8 still rises according to the male screw 22 so that the bridge 7 is further extended, Tab 11 is extension step 2
5 is completely cut off while moving, and the TE ring portion 9 is separated from the main portion 8 to clearly indicate that the plug has been opened.

In the closing device of this embodiment, as in the case shown in FIG. 1, a large force is not applied to the tab 11 at the time of opening, and the deformation of the tab 11 is less likely to occur. For this reason, even when the dimensional accuracy of the container 51 varies,
It is possible to prevent an accident that the E-ring portion 9 is disconnected and defective. Therefore, tamper evidence can be improved. Further, the tightening torque can be reduced.
Further, it is possible to prevent the bridge 7 from being disconnected at the time of mounting.

Further, the closing device of the present invention is not limited to the above-described example, and various changes and modifications can be made. For example, in the above-described embodiment, the container 21 is provided with the pressing portion 24 having the inclined surface from the annular bulging portion 23 and the bridge extending means 26 having the horizontal extension step portion 25.
The extension step portion 25 may be omitted, and only the pressing portion 24 that can surely cut the bridge 7 when the plug is opened may be provided. In addition, the annular bulge is formed as an intermittent bulge, that is, by forming at least one notch on the outer periphery of the annular bulge, an intermittent bulge in which island-shaped bulges are arranged in the circumferential direction. It can also be.

[0034]

As described above, according to the present invention, since the depression is formed on the inner peripheral side of the tub along the outer peripheral shape of the container mouth, the tub is mounted in the container mouth. The tab abuts the container mouth over the circumferential direction. For this reason, at the time of opening, the area of the portion where the tab comes into contact with the annular bulging portion increases, and the drag received by the tab does not concentrate locally, so that the deformation of the tab hardly occurs. Therefore, even if the dimensional accuracy of the container varies, it is possible to prevent the tab from being detached from the container mouth when the cap is opened due to the deformation of the tab, and to prevent the TE ring from being disconnected, thereby preventing tamper evidence. Can be improved.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an embodiment of a closing device according to the present invention.

FIG. 2 is a plan view of a synthetic resin cap used in the closing device shown in FIG.

FIG. 3 is an enlarged view of a main part of a synthetic resin cap used in the closing device shown in FIG. 1;

FIG. 4 is a cross-sectional view showing a state in which the synthetic resin cap is attached to the container in the closing device shown in FIG. 1,
(B) is a longitudinal sectional view, (a) is A ₁ in (b).
-A ₂ line is a sectional view on arrow.

FIG. 5 is an explanatory view showing an operation of a synthetic resin cap used in the closing device shown in FIG. 1;

FIG. 6 is an explanatory view showing an operation of an example of a conventional synthetic resin cap.

FIG. 7 is an enlarged view of a main part of the synthetic resin cap shown in FIG.

8 is a cross-sectional view showing a state in which an example of a conventional synthetic resin cap is attached to a container, (b) is a longitudinal cross-sectional view, and (a) is a line A ₃ -A ₄ in (b). It is a sectional arrow view.

FIG. 9 is a partial sectional view showing another embodiment of the closing device according to the present invention.

At the closed apparatus shown in Figure 10 Figure 9 is a sectional view showing a state where the synthetic resin cap is attached to the container, (b) is a longitudinal sectional view, A ₅ in (a) is (b) -A It is a sectional view taken along line ₆ of FIG.

11 is a cross-sectional view showing a state in which an example of a conventional synthetic resin cap is attached to a container, (b) is a longitudinal cross-sectional view, and (a) is a line A ₇ -A ₈ in (b). It is a sectional arrow view.

FIG. 12 is a partial sectional view showing an example of a conventional closing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cap, 2 ... Top plate part, 3 ... Tube part, 4 ... Cap body, 6 ... Horizontal score (weak line), 7 ... Bridge, 8
... Main part, 9 ... TE ring part (tamper evidence ring part), 10 ... Screw part, 11 ... Tab, 13 ... Circular recess (recess), 21 ... Container, 21a ... Container mouth part, 22 ... Male screw, 23 ... annular bulging part, 24 ... pressing part, 25 ... extension step part, 27 ... storage guide surface

Continued on the front page F term (reference) 3E080 AA07 BB04 3E084 AA04 AA12 AA24 AA32 AB01 BA01 CA01 CC04 CC05 DA01 DB05 DB12 DC04 DC05 FA09 FB01 GA04 GB04 GB08 HA02 HB03 HD01 KA13 KB01 LA05 LA17

Claims (5)

[Claims] 1. A cap body comprising a top plate portion and a tubular portion hanging down from the periphery thereof, the tubular portion being formed by a weakening line with a main portion above the weakening line and a tamper evidence ring portion below the weakening line. A threaded portion is formed on the inner wall surface of the main portion to be screwed with the male screw of the container mouth portion, and a number of tabs projecting in a plate-like shape on the inner wall surface of the tamper evidence ring portion along the circumferential direction. In the synthetic resin cap provided, a recess is formed on the inner peripheral side of the tab along the outer peripheral shape of the container opening. 2. A closing device comprising a container and a synthetic resin cap attached to a mouth thereof, wherein the synthetic resin cap comprises a top plate and a cylindrical portion hanging down from a peripheral edge thereof. A main body, and the tubular portion is divided by the weakening line into a main portion above the weakening line and a tamper evidence ring portion below the weakening line, and is screwed into an inner wall surface of the main portion with a male screw at the container mouth. A thread portion is formed, and a large number of tabs that protrude and undulate in a plate shape on the inner wall surface of the tamper evidence ring portion are provided along the circumferential direction, and on the inner peripheral side of the tab, the outer peripheral shape of the container mouth portion is provided. A recess is formed along the outer periphery of the container, and a male screw is formed on the outer periphery of the container. The male screw is engaged with a tab below the male screw when opening the cap body attached to the container mouth. Prevents tamper evidence ring from moving Closure apparatus characterized by bulging portion of the annular is formed that. 3. A closure device comprising a container and a synthetic resin cap attached to a mouth thereof, wherein the synthetic resin cap comprises a top plate portion and a cylindrical portion hanging down from a peripheral edge thereof. A main body, and the tubular portion is divided by the weakening line into a main portion above the weakening line and a tamper evidence ring portion below the weakening line, and is screwed into an inner wall surface of the main portion with a male screw at the container mouth. A thread portion is formed, and a large number of tabs that protrude and undulate in a plate shape on the inner wall surface of the tamper evidence ring portion are provided along the circumferential direction, and on the inner peripheral side of the tab, the outer peripheral shape of the container mouth portion is provided. A recess is formed along the outer periphery of the container, a male screw is formed on the outer periphery of the mouth, an annular bulge is formed below the male screw, and the bulge is formed in the bulge.
When the synthetic resin cap attached to the container opening is turned in the opening direction, the pressing portion having a slope that gradually pushes downward in the cap opening direction by pushing down the tab of the cap is provided. A closure device characterized by being formed. 4. An extended step portion which engages with a tab pushed down by said inclined surface and prevents upward movement thereof is connected to said pressing portion. Closing device. 5. The closing device according to claim 3, wherein an opposite side of the inclined surface of the extension step portion is a storage guide surface that gradually reduces a protruding height in a cap opening direction.