JP2020055566A - Cap sealing structure - Google Patents

Abstract

To provide a cap sealing structure capable of improving sealability between a container and a cap and sealability between a spouting cylinder of a cap body and a sealing cylinder even if resistance is reduced when the cap is fitted to the mouth of the container.SOLUTION: This sealing structure for a cap fitted to the mouth 1 of a container A is constructed such that the cap comprises a fitting part 5 fitted to the mouth 1 of the container A, and a wall extended inward from the fitting part 5 to close the container, and the fitting part 5 comprises an inner cylinder 12 for sealing the inner periphery of the mouth 1 of the container A, a main seal 15 formed in the outer periphery of the inner cylinder 12 to be pressed into contact with the surface thereof, and auxiliary seals 16, 17 formed below the main seal 15 to come into point-contact therewith.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cap attached to a mouth of a container, and more particularly to a seal structure of a cap for improving the sealing between the mouth of the container and the cap, and the sealing between the spout cylinder and the sealing ring. .

Conventionally, in a cap including a cap body attached to a mouth of a container and a lid closing an opening of the cap body, a pull ring or the like is to be provided on an expected opening portion of the cap body in order to secure sealing inside the container. A partition having a removed portion formed with the above was provided.
Furthermore, in order to ensure the sealing performance between the mouth of the container and the cap body, the mounting portion of the cap body needs to increase the amount of sealing with respect to the mouth of the container.

However, if the cap body is increased in the amount of sealing with respect to the mouth of the container, it is necessary to increase the tapping force when setting the mounting portion of the cap body at the mouth of the container. In addition to the need for force, there has been a problem that the inner cylinder of the cap main body bites during tapping.
For this reason, as a cap for improving the sealing performance between the mouth of the container and the cap body, a tubular inner tubular portion is vertically provided from the back surface of the base wall, and the inner surface of the mouth is outwardly upward from the lower edge of the inner tubular portion. A sealing cylinder having an extended elastic sealing portion to be pressed against is provided, and a through hole communicating with a gap formed between the inner cylinder portion and the sealing portion is formed in a base wall outside the pouring cylinder. A known cap is conventionally known (for example, see Patent Document 1).

Also, in order to open the cap, after opening the lid, it is necessary to remove the removal part by pulling the pull ring etc.There is a problem that it is troublesome and difficult for users with weak power to remove it. there were.
For this reason, as a cap that does not require an opening operation, the inner lid having an inner ring is slidably held by the outer lid in order to seal the spout cylinder of the cap body, and in conjunction with the movement of the outer lid, 2. Description of the Related Art A hinge cap that detaches an inner lid from an opening of a dispensing cylinder and that can be opened by one action to take out a content liquid is conventionally known (for example, see Patent Document 2).

JP-A-9-142512 JP 2014-162499 A

However, although the cap described in Patent Literature 1 can maintain good sealing performance with the inner surface of the mouth of the container, the seal cylinder is formed by a skirt-like seal that spreads outward from the lower edge of the vertical wall. It is necessary to form a cap having a part forming part extending therefrom by integral molding of a synthetic resin, and to push up and invert the sealing part forming part from below using a predetermined jig, which is problematic in that it takes time to form the seal cylinder. Was.
In addition, the cap described in Patent Document 2 focuses on improving the openability that can be opened by one operation, and is used when the user drops the container before using the content liquid. Due to the impact, there is a problem that the liquid in the container adheres to the inner surface of the lid or the liquid leaks.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to improve the hermeticity between a container and a cap even if the resistance at the time of mounting the cap on the mouth of the container is reduced. An object of the present invention is to provide a cap sealing structure capable of improving the sealing performance between an outlet cylinder and a sealing cylinder.

In order to solve the above-mentioned problems, the present invention provides a seal structure of a cap attached to a mouth of a container as a seal structure of the cap, wherein the cap has an attachment portion attached to the mouth of the container, A wall portion extending inward from the portion and closing the inside of the container, and the mounting portion is an inner cylinder for sealing the inner periphery of the mouth of the container, and a main seal portion formed on the outer periphery of the inner cylinder for surface pressure contact. And an auxiliary seal portion formed below the main seal portion and in point contact with the main seal portion.
As a specific embodiment of the seal structure of the cap, the mounting portion includes an outer peripheral wall portion screwed with the outer periphery of the mouth of the container, and the cap is a cap mounted on the mouth of the container. A main body, and a lid body for opening and closing the opening of the cap main body; and an outer periphery of the inner cylinder, an outer peripheral surface portion from an upper end portion, and a reduced diameter outer peripheral surface portion reduced in diameter from a lower end of the outer peripheral surface portion. Wherein the auxiliary seal portion is formed on the outer peripheral surface portion with a reduced diameter, and the inner cylinder is formed so that the thickness of the auxiliary seal portion is smaller than the thickness of the main seal portion. A configuration is adopted in which the lower part of the inner peripheral surface is an enlarged inner peripheral surface.
The wall portion has a thin portion or a concave portion formed on at least one of the inner peripheral side and the outer peripheral side of the inner cylinder base.

  Further, the present invention is a cap sealing structure including, as a cap sealing structure, a cap body attached to a mouth of a container, and a lid body that opens and closes an opening of the cap body, wherein the cap body is formed of a container. A mounting portion attached to the mouth portion, a base wall extending inward from the mounting portion, and a pouring cylinder opened to the base wall, wherein the lid body has a pouring cylinder inner periphery of the cap body. The present invention employs a configuration including a seal cylinder to be sealed, a main seal portion formed on the outer periphery of the seal cylinder and in surface pressure contact, and an auxiliary seal portion formed below the main seal portion and in point contact.

  As a specific embodiment of the cap sealing structure, the outer periphery of the seal cylinder has an outer peripheral surface portion from the upper end and a reduced outer peripheral surface portion reduced in diameter from the lower end of the outer peripheral surface. The configuration characterized in that it is formed on the surface portion, and the seal cylinder is such that the lower portion of the inner peripheral surface portion is an enlarged inner peripheral surface portion so that the thickness of the auxiliary seal portion is smaller than the thickness of the main seal portion. The dispensing cylinder has a stepped portion formed by reducing the diameter of an inner peripheral lower portion, and the main seal portion has a flat surface in cross section. A configuration in which the auxiliary seal portion has an arc-shaped cross-sectional shape, a configuration in which a plurality of auxiliary seal portions are formed in the vertical direction, , Having a tapered surface portion inclined inward. To use.

The seal structure of the cap according to the present invention is arranged such that an auxiliary seal portion that is in point contact with a main seal portion that is in surface contact is provided on the outer periphery of the inner cylinder of the cap that is inserted into the inner periphery of the mouth portion of the container. Even when the resistance at the time of mounting the cap is reduced, the sealing performance between the container and the cap can be improved.
Further, when the cap is a screw cap, the main seal portion and the auxiliary seal portion are provided on the outer periphery of the inner cylinder, so that the screw cap is screwed into the mouth portion of the container. , The sealing performance between the container and the screw cap can be improved.
Further, the seal structure of the cap of the present invention, by arranging an auxiliary seal portion that is in point contact with the main seal portion that is in surface contact with the outer periphery of the seal cylinder of the lid that is inserted into the inner periphery of the spout cylinder of the cap body. In addition, even when the resistance at the time of opening and closing the lid is reduced, the sealing performance between the spout cylinder of the cap body and the sealing cylinder of the lid can be improved.

It is a side sectional view showing the state where a hinge cap of a 1st example of the present invention was attached to a container. FIGS. 3A and 3B are explanatory views showing a state in which the hinge cap according to the first embodiment of the present invention is opened, wherein FIG. 3A is a top view and FIG. FIG. 2 is an enlarged explanatory view of a main part of FIG. 1. It is a side sectional view showing the state where a hinge cap of a 2nd example of the present invention was attached to a container. It is explanatory drawing which shows the lid open state of the hinge cap of 2nd Example of this invention, (a) is a top view, (b) is a side sectional view. FIG. 5 is an enlarged explanatory view of a main part of FIG. 4. It is explanatory drawing which shows the state which attached the screw cap of 3rd Example of this invention to the container, (a) is a half sectional view, (b) is a principal part enlarged explanatory view of (a).

The seal structure of the cap according to the present invention will be described with reference to the drawings showing examples.
In the following description, as viewed in FIG. 1, the left direction is “front”, the right direction is “back”, the upper direction is “up”, and the lower direction is “down”.

1 and 2, A is a container, B is a cap body attached to the container A, C is a hinge, and D is a lid attached to the cap body B via a hinge C so as to be openable and closable.
The container A has a mouth 1 at an upper portion, and a fitting ridge 2 is provided on an outer peripheral surface of the mouth 1.

As shown in FIGS. 1 and 2, the cap body B includes a mounting portion 5 mounted on the mouth 1 of the container A, and a base wall as a wall portion extending inward from an upper end of an inner edge of the mounting portion 5. 6 and a pouring cylinder 7 erected from the base wall 6.
In addition, a transition portion E is continuously provided in the pouring cylinder 7 via a weakened portion 8 as an opening planned portion.

In the present embodiment, the ejection tube 7 is provided near the front side from the center, and a wing portion 9 that is inclined inward so as to surround the transition portion E is provided at the lower end of the ejection tube 7. .
The wing portion 9 has a rectifying effect of preventing the content liquid from being poured at once at the time of pouring, and even if the weakened portion 8 is unexpectedly broken by some impact, the wing portion 9 has a rectifying effect. Falling can be prevented.

The mounting portion 5 has an annular lid engaging portion 11 provided with a locking ridge 10 on a peripheral edge thereof and engaging with the lid D, and an inner cylinder 12 vertically suspended from an inner peripheral side of the lid engaging portion 11. And an outer peripheral wall portion 13 vertically provided from the outer peripheral side of the lid engaging portion 11.
The outer peripheral wall portion 13 is provided with an engaging projection 14 which engages with the fitting projection 2 of the container A at a lower portion of the inner periphery.

As shown in FIG. 3, the outer periphery of the inner cylinder 12 has an outer peripheral surface portion 12a from the upper end, a reduced diameter outer peripheral surface portion 12c formed by forming an inclined step portion 12b from the lower end of the outer peripheral surface portion 12a, and a reduced diameter outer peripheral surface portion 12c. And a tapered surface portion 12d inclined inward from the lower end of the surface portion 12c toward the lower end of the inner cylinder 12.
The inner circumference of the inner cylinder 12 is composed of an inner peripheral surface portion 12e from the upper end and an enlarged inner peripheral surface portion 12f whose diameter is enlarged from the lower end of the inner peripheral surface portion 12e.
A main seal portion 15 having a flat surface is formed on the outer peripheral surface portion 12a, and when the hinge cap is plugged into the container A, the surface of the outer peripheral portion 12a comes into pressure contact with the upper portion of the inner peripheral portion of the mouth portion 1 with a certain amount of interference. ing. In addition, the flat surface may be parallel to the inner periphery of the mouth 1 or may be inclined so as to spread downward.
The reduced-diameter outer peripheral surface portion 12c is formed to have a diameter that does not abut the inner peripheral surface of the mouth portion 1. The reduced-diameter outer peripheral surface portion 12c is vertically adjacent to the reduced-diameter outer peripheral surface portion 12c. Auxiliary seal portions 16 and 17 having a circular cross section and projecting in the circumferential direction are provided in point contact with the surfaces.
In this embodiment, the auxiliary seal portions 16 and 17 have a circular cross section, but the auxiliary seal portions 16 and 17 may have different cross sectional shapes.
The auxiliary seal portions 16 and 17 have the same peak height of the arc, but the height of the arc peak is different so that the amount of contact with the inner periphery of the mouth 1 can be freely set. it can. This is effective, for example, in the case where the inner circumference of the mouth 1 has a shape whose diameter is enlarged.

As shown in FIG. 2, a substantially V-shaped outer peripheral cut portion 18 in a plan view is formed on the outer peripheral surface of the outer peripheral wall portion 13 near the left or right of the hinge C, leaving a thin bottom wall 19 at the lower end. It is cut from.
At a position corresponding to the outer peripheral cut portion 18 of the engaging projection 14, an inner peripheral cut portion (not shown) is engraved in the vertical direction to form a vertical tear line.

On the hinge C side of the outer peripheral cut portion 18, a slit groove 20 is recessed from above so as to extend in a circumferential direction from a position separated by an upper thin portion on the inner peripheral side of the end face 18 a as a starting point. , Extending from the end face 18a over about 345 °.
A thin connection connecting the outer peripheral wall portion 13 and the lid engaging portion 11 is formed on the inner peripheral side of the bottom surface 21 of the slit groove 20 with the starting point of the slit groove 20 adjacent to the longitudinal tear line as a tearing start point. A portion 22 is provided, the circumferential tear line is formed to extend in an arc shape, and can be torn to an unbreakable connection portion at the end point.

In the present embodiment, on the rear side (hinge C side) of the upper surface of the base wall 6, a first guide ridge 23 and a second guide ridge 24 are juxtaposed on the outside of the pouring cylinder 7. A reinforcing wall 36 suspended from D can be inserted between the first guide ridge 23 and the second guide ridge 24, and the upper part of the second guide ridge 24 is on the hinge C side. is open.
In the base wall 6, a thin portion 28 is formed on the inner peripheral side of the base of the inner cylinder 12, and a concave portion 29 is formed on the outer peripheral side of the inner cylinder 12.
In this embodiment, the first guide ridge 23 and the second guide ridge 24 are provided so as to surround the pouring cylinder 7 over about 60 ° from the hinge C side, as shown in FIG. I have.

  The transition portion E is composed of a bottom wall 25 connected to the inner periphery of the lower part of the dispensing cylinder 7 via the weakening portion 8 and an engagement wall 26 erected from the edge of the bottom wall 25. An engagement ridge 27 that engages with an engagement projection 34 of an engagement cylinder 32 that is vertically provided from a lid D, which will be described later, is provided at an upper portion of the inner periphery.

As shown in FIGS. 1 and 2, the lid D is rotatably attached to the outer peripheral upper end of the outer peripheral wall 13 of the cap body B via the hinge C, and includes a top wall 30 and a top wall. And a side peripheral wall 31 that is suspended from a peripheral portion of the peripheral portion 30.
The top wall 30 is provided with an engagement cylinder 32 and a seal cylinder 33 extending outside the engagement cylinder 32 from the lower surface. The engagement cylinder 32 has a distal end inserted into the engagement wall 26 of the transition portion E. The sealing cylinder 33 is vertically provided so as to engage with the engaging wall 26 and the outer periphery thereof comes into contact with the inner periphery of the discharging cylinder 7 of the cap body B.

An engaging projection 34 is provided on the lower part of the outer periphery of the engaging cylinder 32 and, as shown in FIG. 1, engages with the engaging ridge 27 on the inner peripheral part of the engaging wall 26 in the closed state. When the cover is opened, the transition portion E is lifted together with the lid D to break the weakened portion 8 so that the transition portion E transitions to the lid D.
The engagement cylinder 32 is provided near the front side similarly to the engagement wall 26.
The engaging position between the engaging protrusion 34 of the engaging cylinder 32 and the engaging ridge 27 of the engaging wall 26 is provided as far as possible from the lid D, so that the open state shown in FIG. When the hinge cap is closed by rotating the lid D about the hinge C as a fulcrum, the engagement can be performed from a substantially vertical direction, and a local load due to partial contact in an oblique direction can be obtained. Can be avoided, and breakage of the weakened portion 8 can be prevented.
In the present embodiment, the upper part of the engagement cylinder 32 is reinforced by the reinforcing rib 35, but the reinforcing rib 35 may be omitted.

Further, in this embodiment, a reinforcing wall 36 is vertically provided on the back side from the lower surface of the top wall 30, and the front end of the reinforcing wall 36 is connected to the first guide ridge 23 of the cap body B and the second guide when the lid is closed. The base wall 6 is located close to the ridge 24.
2A, the reinforcing wall 36 is provided so as to surround the seal cylinder 33 over about 60 ° from the hinge C side, similarly to the first guide ridge 23 and the second guide ridge 24. Have been.

The lower end of the side peripheral wall 31 is provided on the inner peripheral side with an engagement recess 37 for fitting with the lid engagement portion 11 of the cap body B. Inside the engagement recess 37, the engagement of the lid engagement portion 11 is provided. A locking projection 38 that engages with the stop projection 10 to maintain the lid closed is provided around the circumference.
An arc-shaped finger hook 39 extends in the circumferential direction on the outer periphery of the side peripheral wall 31 on the side opposite to the hinge C.

  Although not shown, the hinge cap of this embodiment is provided with a shrink label, a sealing member, and the like between the cap body B and the lid D in order to prevent unauthorized opening before use.

Next, a description will be given of a usage mode and an operation effect of the present embodiment.
As shown in FIG. 2, the hinge cap of the present embodiment is obtained by molding with the lid open, and the lid D is rotated via the hinge C to obtain the closed state shown in FIG. .
At this time, the lower end of the reinforcing wall 36 of the lid D is lowered while being guided by the second guide projection 24 while lightly abutting on the open portion of the upper portion of the second guide projection 24 of the cap body B, At the same time, the lower end of the sealing cylinder 33 contacts the upper part of the pouring cylinder 7 and the lower part of the engaging projection 34 of the engaging cylinder 32 abuts on the upper part of the engaging ridge 27 of the engaging wall 26. Is applied, the engagement protrusion 34 and the engagement protrusion 27 are engaged.

In addition, the seal cylinder 33 is in contact with the pouring cylinder 7 to form a seal portion, and the reinforcing wall 36 has a distal end inserted between the first guide ridge 23 and the second guide ridge 24, and Close to 6.
Further, the lid engaging portion 11 of the cap body B is fitted with the engaging concave portion 37 of the lid D, and the hinge cap of the present embodiment is in the closed state.

Next, the closed hinge cap is plugged and attached to the container A filled with the content liquid.
At this time, the lower part of the outer periphery of the inner cylinder 12 of the cap body B is inserted into the upper part of the inner periphery of the mouth 1 of the container A, and the inner periphery of the outer peripheral wall 13 and the outer periphery of the mouth 1 engage, so that the mounting part 5 It is attached while holding the mouth 1.
In the present embodiment, since the thin portion 28 is formed on the inner peripheral side of the base of the inner cylinder 12 and the concave portion 29 is formed on the outer peripheral side, when the container A is plugged, the inner cylinder 12 is And it becomes easy to insert along the inner circumference of the container A.
In the present embodiment, the mounting portion 5 holds the mouth 1 of the container A by the outer periphery of the inner cylinder 12 and the inner periphery of the outer peripheral wall portion 13. However, the outer periphery of the mouth 1 of the container A A male screw may be formed on the inner wall of the outer peripheral wall portion 13 and a female screw may be formed on the inner peripheral surface of the outer peripheral wall portion 13.

In FIG. 3, in the conventional inner cylinder of the cap body, a tapered surface is provided so that the lower end portion can be easily inserted into the inner periphery of the mouth portion 1 as indicated by a dashed line. At the time of insertion, the entire outer peripheral surface except for the tapered surface is in surface pressure contact with a sealing amount, firmly adheres to seal the inside of the container A, and is prevented from coming off the container A. The extra force required for tapping is required.
On the other hand, the inner cylinder 12 of the mounting portion 5 according to the present embodiment is provided with the tapered surface portion 12d at the lower end, so that it can be easily inserted into the inner periphery of the mouth 1 and the main seal portion 15 of the outer peripheral surface portion 12a. Are pressed against only the upper part of the inner periphery of the mouth part 1 with a smaller sealing amount than the conventional one, and are protruded from the reduced-diameter outer peripheral surface part 12c so as to assist this, and the auxiliary sealing parts 16, 17 vertically adjacent to each other are provided. Are in point contact with each other, and the inner cylinder 12 is formed with the enlarged inner peripheral surface portion 12f, so that the thickness of the auxiliary seal portions 16, 17 is formed smaller than the thickness of the main seal portion 15, and the inner cylinder 12 is easily deformed. As a result, compared to the conventional inner cylinder, it can be attached with a lower tapping force, and the sealing performance can be maintained.

Further, since there are two auxiliary seal portions 16 and 17 that are in point contact with the mouth 1 in the vertical direction, even if one of the main seal portion 15 or the auxiliary seal portions 16 and 17 comes off due to a drop impact or the like. If both or one of the auxiliary seal portions 16 and 17 is securely in contact, the sealing and the cap body B can be prevented from coming off from the mouth portion 1 of the container A. Sealing can be maintained more reliably.
In the present embodiment, two auxiliary seal portions 16 and 17 are provided vertically on the reduced-diameter outer peripheral surface portion 12c, but a plurality of auxiliary seal portions may be provided, and the number of auxiliary seal portions provided is equal to that of the above-described embodiment. Not limited.

In the hinge cap of the present embodiment, even if a pressing force is applied to the lid D from the side due to an impact such as dropping in a state where the lid is closed, the distal end portion of the reinforcing wall 36 has the first guide ridge 23, Engagement by the two guide ridges 24 and the base wall 6 prevents the engagement cylinder 32 and the seal cylinder 33 from moving together with the lid D due to impact, and prevents the weakened portion 8 from breaking.
Further, a pressing force is applied from above, and it is possible to prevent the engagement cylinder 32 from pushing the upper portion of the bottom wall 25 of the transition portion E to lower the transition portion E, thereby preventing the weakened portion 8 from breaking. can do.

When the hinge cap of the present invention is used for the first time, by opening the lid, the weakened portion 8 between the discharge tube 7 and the transition portion E of the cap body B can be broken and removed.
First, when a finger is hung on the finger hook portion 39 of the lid D and the finger hook portion 39 is lifted, the engagement protrusion 34 of the engagement cylinder 32 and the engagement protrusion 27 of the engagement wall 26 of the transition portion E are engaged. Therefore, the transition portion E is lifted together with the lid D, whereby the weakened portion 8 is broken, and the transition portion E transitions to the lid D as it is.
Further, by lifting the lid D, the sealing cylinder 33 and the reinforcing wall 36 are lifted together with the engagement cylinder 32 to be in an open state, and the transition portion E in the pouring cylinder 7 becomes an opening. Thus, the content liquid in the container A can be poured out.

  Further, after the use of the content liquid, the lid D is closed again on the cap body B, whereby a seal portion is formed by the seal cylinder 33 and the pouring cylinder 7 of the lid D, and the inside of the hinge cap is sealed again. The lid D can be repeatedly opened and closed for use.

The hinge cap according to the present embodiment can be discarded after being separated from the container A after the entire liquid content in the container A is used.
In this case, when the hinge cap is opened, the lid D is grasped with a finger and pulled outward, the portion of the outer peripheral wall 13 connected to the hinge C is pulled and deformed, and the vertical tear line is formed. Is broken, and when the lid D is further pulled, the connecting portion 22 forming the circumferential tear line starts to break. As the fracture of the connecting portion 22 progresses, the lid D moves away from the cap body B.
When the cutting of the connecting portion 22 is completed up to the end portion of the slit groove 20 and the lid D is further pulled, the fitting between the cap body B and the container A is released, and the hinge cap and the container A can be discarded separately. it can.

Next, a second embodiment in which the configuration of the cap body B and the lid D of the first embodiment is changed will be described with reference to FIGS.
Hereinafter, the same components as those of the first embodiment are denoted by the same reference numerals, and the changed portions of the cap body B and the lid D are denoted by new reference numerals, and the description will be focused on the differences.

  4 and 5, A is a container, Ba is a cap body attached to the container A, C is a hinge, and Da is a lid body that is openably and closably attached to the cap body Ba via the hinge C.

  The cap body Ba is erected from a mounting part 45 to be mounted on the mouth 1 of the container A, a base wall 46 as a wall part extending inward from an upper end of an inner edge of the mounting part 45, and a base wall 46. And a discharge cylinder 47. Further, an opening is provided in the pouring cylinder 47.

  The base wall 46 is provided with a protruding portion 48 that protrudes inwardly of the pouring cylinder 47 from the lower surface of the inner edge, and whose upper surface is a step portion 48 a formed by reducing the inner peripheral lower portion of the pouring tube 47.

The mounting portion 45 includes an annular lid engaging portion 11 on which the locking ridge 10 is provided on the periphery and which engages with the lid Da, an inner cylinder 49 that is vertically provided from an inner peripheral side of the lid engaging portion 11, And an outer peripheral wall portion 13 vertically provided from the outer peripheral side of the lid engaging portion 11.
In the present embodiment, the inner cylinder 49 is a conventional one as described in the first embodiment, which has an interference margin on the outer peripheral surface.

  The lid Da has a seal tube 50 whose outer periphery is in close contact with the inner periphery of the pouring tube 47 of the cap body Ba at a predetermined position on the lower surface of the top wall 30, and a reinforcing wall 36 is vertically provided on the back side. .

As shown in FIG. 6, the outer periphery of the seal cylinder 50 has an outer peripheral surface portion 50a from the upper end, a reduced diameter outer peripheral surface portion 50c formed by forming an inclined step portion 50b from the lower end of the outer peripheral surface portion 50a, and having a reduced diameter. And a tapered surface portion 50d which is inclined inward from the lower end of the surface portion 50c toward the lower end of the seal cylinder 50.
The inner periphery of the seal cylinder 50 is composed of an inner peripheral surface 50e from the upper end and an enlarged inner peripheral surface 50f whose diameter is enlarged from the lower end of the inner peripheral surface 50e.
A main seal portion 51 having a flat surface in cross-section is formed on the outer peripheral surface portion 50a, and when the hinge cap is closed, the main seal portion 51 comes into surface pressure contact with a certain amount of interference against the vicinity of the inner peripheral upper end portion of the injection tube 47. ing. The flat surface may be parallel to the inner periphery of the pouring cylinder 47 or may be inclined so as to spread downward.
The reduced diameter outer peripheral surface portion 50c is formed with a diameter that does not abut the inner peripheral surface of the pouring cylinder 47, and is vertically adjacent to the reduced diameter outer peripheral surface portion 50c, and the distal end of the reduced diameter outer peripheral surface portion 50c is formed. Auxiliary seal portions 52 and 53 having a circular cross section that is in point contact with the inner peripheral surface are provided in the circumferential direction.

Next, a description will be given of a usage mode and an operation effect of the present embodiment.
As shown in FIG. 5, the hinge cap of the present embodiment is obtained by molding with the lid open, and the lid Da is rotated via the hinge C to be in the closed state shown in FIG. .
When the lid is closed, the sealing cylinder 50 of the lid Da is inserted into the discharging cylinder 47 of the cap body Ba, and the inside of the discharging cylinder 47 is sealed.

In FIG. 6, in the conventional sealing cylinder of the lid, a tapered surface is provided so that the lower end portion can be easily inserted into the inner periphery of the discharging cylinder 47 as shown by a dashed line. At the time of insertion into the periphery, the entire outer peripheral surface except the tapered surface is brought into surface pressure contact with a sealing amount, and tightly adheres to hermetically seal the inside of the container A and prevent the container A from being detached from the pouring cylinder 47. An extra force to close the lid is required for the entire closing margin.
On the other hand, the seal cylinder 50 of the lid Da of the present embodiment is provided with a tapered surface 50d at the lower end so that it can be easily inserted into the inner periphery of the pouring cylinder 47 of the cap main body Ba, and the main surface of the outer peripheral surface 50a. The sealing portion 51 is brought into surface contact with only the upper portion of the inner periphery of the discharge cylinder 47 with a smaller sealing amount than that of the conventional one, and protrudes from the reduced-diameter outer peripheral portion 50c in a form to assist the sealing. The parts 52 and 53 are in point contact with each other, and the seal cylinder 50 is formed such that the thickness of the auxiliary seal parts 52 and 53 is smaller than the thickness of the main seal part 51 by forming the enlarged inner peripheral surface part 50f. Because it is easily deformed, the lid can be closed with a weaker force than a conventional seal cylinder.

Furthermore, since there are two auxiliary seal portions 52 and 53 that are in point contact with the pouring cylinder 47 in the vertical direction, even if one of them comes off the contact, it is only necessary that the other comes into contact securely. The inside of the cylinder 47 can be more reliably sealed.
In this embodiment, two auxiliary seal portions 52 and 53 are provided vertically on the reduced-diameter outer peripheral surface portion 50c. However, a plurality of auxiliary seal portions may be provided. Not limited.

  In this embodiment, when the lid is closed, the sealing cylinder 50 of the lid Da is pressed against the inner peripheral surface of the pouring cylinder 47 of the cap body Ba with a certain amount of interference at the main sealing portion 51. Since the auxiliary seal portions 52 and 53 are in point contact with each other to stably seal the inside of the pouring cylinder 47, there is no need to provide a partition or the like in the pouring cylinder 47 for sealing the inside of the container before use.

In the hinge cap of this embodiment, even when a pressing force is applied to the lid Da from above due to impact such as tapping or dropping when the lid is closed, the lower end of the seal cylinder 50 of the lid Da is the cap body. It abuts on a step portion 48a formed at the lower part of the inner periphery of the Ba injection cylinder 47, and prevents the seal cylinder 50 and the lid Da accompanying it from falling down.
Other functions and effects are the same as those of the first embodiment.

  Next, a third embodiment in which the hinge cap of the first embodiment is changed to a screw cap will be described with reference to FIG.

In FIG. 7, Aa is a container, and F is a screw cap.
As shown in FIG. 7, the container Aa has a container screw 61 that is screwed with the screw cap F, and a neck ring 62 protruding below the container screw 61 on the outer periphery of the mouth 60.

As shown in FIG. 7, the screw cap F includes a mounting portion 65 mounted on the mouth portion 60 of the container Aa, and a top wall portion 66 as a wall portion extending inward from the mounting portion 65. I have.
The mounting portion 65 includes a cylindrical outer peripheral wall portion 67 suspended from the outer edge of the top wall portion 66 and an inner cylinder 68 suspended from the inner surface of the top wall portion 66.

On the inner periphery of the outer peripheral wall portion 67, a cap screw portion 69 screwed with the container screw portion 61 of the container Aa is provided.
The inner cylinder 68 is inserted into the inner periphery of the mouth 60 of the container Aa when the lid is closed, and seals the inside of the container Aa. From the inner surface of the top wall 66, to the outside of the inner cylinder 68, the tip is closed. A contact ring 70 that is deformable in close contact with the upper surface of the mouth portion 60 of the container Aa is vertically provided.

As shown in FIG. 7 (b), the outer periphery of the inner cylinder 68 has an outer peripheral surface 68a from the upper end, a reduced outer peripheral surface 68c formed by forming an inclined step 68b from the lower end of the outer peripheral surface 68a, and having a reduced diameter. A tapered surface portion 68d that inclines inward from the lower end of the reduced diameter outer peripheral surface portion 68c toward the lower end of the inner cylinder 68 is formed.
The inner circumference of the inner cylinder 68 is composed of an inner peripheral surface 68e from the upper end and an enlarged inner peripheral surface 68f whose diameter is increased from the lower end of the inner peripheral surface 68e.

A main seal portion 73 having a flat surface is formed on the outer peripheral surface portion 68a so that when the screw cap F is screwed into the container Aa, a portion thereof comes into pressure contact with the vicinity of the upper inner peripheral portion of the mouth portion 60 with a certain amount of interference. Have been.
The reduced-diameter outer peripheral surface portion 68c is formed to have a diameter that does not contact the inner peripheral surface of the mouth portion 60. The reduced-diameter outer peripheral surface portion 68c is vertically adjacent to the reduced-diameter outer peripheral surface portion 68c, and the distal end portion has the inner peripheral surface of the mouth portion 60. Auxiliary seal portions 74 and 75 having an arc-shaped cross section that is in point contact with the surface are provided to protrude in the circumferential direction.
In the top wall portion 66, a thin portion 71 is formed on the inner peripheral side of the inner cylinder 68, and a concave portion 72 is formed on the outer peripheral side of the inner cylinder 68.

Next, a description will be given of a usage mode and an operation effect of the present embodiment.
When the screw cap F is put on the mouth portion 60 of the container Aa from above, the screw cap F descends while screwing the cap screw portion 69 on the inner periphery of the outer peripheral wall portion 67 into the container screw portion 61 of the container Aa. The screw cap F is closed.
At this time, the lower part of the outer periphery of the inner cylinder 68 of the screw cap F is inserted into the upper part of the inner periphery of the mouth portion 60 of the container Aa, and the contact ring 70 is in close contact with the upper surface of the mouth portion 60, thereby ensuring the inside of the container Aa. Can be sealed.

In the present embodiment, the thin portion 71 is formed on the inner peripheral side of the base of the inner cylinder 68, and the concave portion 72 is formed on the outer peripheral side. Therefore, when the screw cap F is closed, the inner cylinder 68 is It is easy to deform from the base, and it is easy to insert along the inner periphery of the mouth 60.
Other functions and effects are the same as those of the first embodiment.

  Further, in the first to third embodiments, the hinge cap and the screw cap have been described as specific examples of the cap sealing structure. However, the present invention is not limited to the hinge cap and the screw cap, and various caps such as inner plugs are used. It can be widely used as a seal structure.

The seal structure of the cap according to the present invention is configured such that a plurality of auxiliary seal portions that are in point contact with a main seal portion that comes into surface contact with the inner cylinder outer periphery of the cap that is inserted into the inner periphery of the mouth portion of the container, or the cap body By arranging a plurality of auxiliary seals that make point contact with the main seal that comes into surface contact with the outer periphery of the seal cylinder of the lid that is inserted into the inner circumference of the pouring cylinder, the inside of the container can be fitted with a weaker fitting force than before. Can be sealed.
In addition, since it is excellent in hermeticity, it can be applied to a wide range as a seal structure of a cap for a container for storing a content liquid requiring airtightness.

A, Aa container B, Ba cap body C Hinge D, Da lid E Transition part F Screw cap 1, 60 Portion 2 Fitting ridge 5, 45, 65 Mounting part 6, 46 Base wall (wall part)
7, 47 Discharge cylinder 8 Weakened part 9 Blade part 10 Locking ridge 11 Lid engaging part 12, 49, 68 Inner cylinder 12a, 50a, 68a Outer peripheral surface part 12b, 50b, 68b Inclined step part 12c, 50c, 68c Diameter outer peripheral surface 12d, 50d, 68d Tapered surface 12e, 50e, 68e Inner peripheral surface 12f, 50f, 68f Increased inner peripheral surface 13, 67 Outer peripheral wall 14 Engagement projection 15, 51, 73 Main seal 16, 16 , 52, 53, 74, 75 Auxiliary seal part
18 Outer perimeter cut portion 18a End surface 19 Thin bottom wall 20 Slit groove 21 Bottom surface 22 Connecting portion 23 First guide ridge 24 Second guide ridge 25 Bottom wall 26 Engagement wall 27 Engagement ridges 28, 71 Thin portions 29, 72 Recess 30 Top wall 31 Side peripheral wall 32 Engagement cylinder 33, 50 Seal cylinder 34 Engagement projection 35 Reinforcement rib 36 Reinforcement wall 37 Engagement recess 38 Engagement projection 39 Finger hook 48 Projection 48a Step 61 Container screw 62 Neck Ring 66 Top wall (wall)
69 Cap screw part 70 Contact ring

Claims (13)

A seal structure of a cap attached to the mouth of the container,
The cap includes a mounting portion mounted on the mouth of the container, and a wall portion extending inward from the mounting portion and closing the inside of the container,
The mounting portion includes an inner cylinder that seals the inner periphery of the mouth of the container, a main seal portion formed on the outer periphery of the inner cylinder, which comes into surface pressure contact, and an auxiliary seal portion that is formed below the main seal portion and makes point contact. A seal structure for a cap, characterized in that:   The cap sealing structure according to claim 1, wherein the mounting portion includes an outer peripheral wall portion screwed with an outer periphery of a mouth portion of the container.   The cap sealing structure according to claim 1, wherein the cap includes a cap body attached to a mouth of the container, and a lid that opens and closes an opening of the cap body. The outer periphery of the inner cylinder has an outer peripheral surface portion from the upper end portion and a reduced outer peripheral surface portion reduced in diameter from the lower end of the outer peripheral surface portion,
The seal structure for a cap according to any one of claims 1 to 3, wherein the auxiliary seal portion is formed on a reduced-diameter outer peripheral surface portion.   The inner cylinder is characterized in that a lower portion of an inner peripheral surface portion is an enlarged inner peripheral surface portion so that a thickness of the auxiliary seal portion is smaller than a thickness of the main seal portion. The seal structure of the cap according to 1.   The sealing structure for a cap according to any one of claims 1 to 5, wherein the wall portion has a thin portion or a concave portion formed on at least one of an inner peripheral side and an outer peripheral side of the inner cylinder base. A cap sealing structure including a cap body attached to the mouth of the container and a lid that opens and closes the opening of the cap body,
The cap body includes a mounting portion mounted on the mouth of the container, a base wall extending inward from the mounting portion, and a pouring cylinder opened on the base wall,
The lid body is a seal cylinder that seals the inner periphery of the spout cylinder of the cap body, a main seal portion formed on the outer periphery of the seal cylinder and in surface pressure contact, and an auxiliary seal portion formed below the main seal portion and in point contact. And a cap sealing structure. The outer periphery of the seal cylinder has an outer peripheral surface portion from the upper end portion and a reduced outer peripheral surface portion reduced in diameter from the outer peripheral portion lower end,
The seal structure for a cap according to claim 7, wherein the auxiliary seal portion is formed on an outer peripheral surface portion with a reduced diameter.   9. The seal cylinder according to claim 7, wherein the lower portion of the inner peripheral surface portion is an enlarged inner peripheral surface portion so that the thickness of the auxiliary seal portion is smaller than the thickness of the main seal portion. 10. Cap sealing structure.   The sealing structure for a cap according to any one of claims 7 to 9, wherein the dispensing cylinder has a step formed by reducing a diameter of an inner peripheral lower portion. The main seal portion has a flat cross section,
The seal structure for a cap according to any one of claims 1 to 10, wherein the auxiliary seal portion has an arc-shaped cross section.   The seal structure for a cap according to any one of claims 1 to 11, wherein a plurality of auxiliary seal portions are formed in a vertical direction.   The cap sealing structure according to any one of claims 1 to 12, wherein a lower portion of the auxiliary seal portion has a tapered surface portion inclined inward.

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