Discharge cap

Abstract

To provide a discharge cap capable of easily discharging even a content having a relatively high viscosity.SOLUTION: A discharge cap comprises a plurality of covering pieces 13 which extend inward in the radial direction from the opening peripheral edge of a communication hole 18 on the upper face of an inner plug member 12 and cover the communication hole. The plurality of covering pieces are disposed around the central axis of the communication hole. A fixing cylinder 16 which extends downward and sandwiches / fixes the outer end portion in the radial direction of the covering piece between the fixing cylinder and the opening peripheral edge portion of the communication hole on the upper face of the inner plug member is formed on the opening peripheral edge portion of a discharge hole 15 on a top wall 14 of a cap body 11. The opening peripheral edge portion of the communication hole on the upper face of the inner plug member has an overhanging portion 12b which overhangs inward in the radial direction from a lower end opening edge of the fixing cylinder abutting the outer end portion of the covering piece in the radial direction. The plurality of covering pieces extend upward toward the inside in the radial direction and are disposed so as to be rotatable in the vertical direction around the outer end portion in the radial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a dispensing cap. [Background technology]

[0002] Conventionally, as shown in Patent Document 1 below, for example, a discharge cap has been known which is fitted to the mouth of a double container comprising an inner container which shrinks and deforms as the contents stored therein decrease, an outer container fitted with the inner container, and an external air inlet port which introduces external air between the outer container and the inner container as the contents decrease, and which comprises a topped cylindrical cap body having a top wall in which a discharge hole for the contents is formed, an inner plug member which is provided between the top wall of the cap body and the mouth, which covers the upper opening of the mouth, and which has a communication hole which connects the inside of the inner container with the discharge hole, and an on-off valve which is provided between the top wall of the cap body and the inner plug member and which opens and closes the communication hole, wherein the on-off valve allows the flow of contents from inside the inner container towards the discharge hole and restricts flow in the opposite direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-188184 Summary of the Invention [Problem to be solved by the invention]

[0004] This type of dispensing cap has the problem that it is difficult to dispense contents with a relatively high viscosity, such as paste wasabi or paste mustard.

[0005] The present invention provides a discharge cap that can easily discharge even contents with a relatively high viscosity. [Means for solving the problem]

[0006] A discharge cap according to one aspect of the present invention comprises an inner container that shrinks and deforms as the contents contained therein decrease, an outer container in which the inner container is housed, and a double container having an outside air inlet for introducing outside air between the outer container and the inner container as the contents decrease, the double container comprising a topped cylindrical cap body that is attached to the mouth of the double container and has a top wall in which a discharge hole for the contents is formed, an inner plug member that is provided between the top wall of the cap body and the mouth, covers the upper end opening of the mouth, and has a communication hole that connects the inside of the inner container to the discharge hole, and a front end portion of the inner plug member that extends from the periphery of the opening of the communication hole on the top surface of the inner plug member toward the inside in a radial direction intersecting the central axis when viewed from the top-bottom direction, the front end portion of the inner plug member being in contact with the top wall of the cap body and the mouth. and a plurality of covering pieces that cover the communicating holes, the plurality of covering pieces being arranged around the central axis of the communicating holes, and a fixed tube is formed at the opening periphery of the discharge hole in the top wall of the cap body, extending downward and sandwiching and fixing the radial outer ends of the covering pieces between the opening periphery of the communicating hole in the upper surface of the middle plug member, and the opening periphery of the communicating hole in the upper surface of the middle plug member has a protruding portion that protrudes radially inward from the lower end opening edge of the fixed tube that abuts against the radial outer ends of the covering pieces, and the plurality of covering pieces extend upward as they extend radially inward and are arranged to be rotatable up and down around the radial outer ends.

[0007] The multiple covering pieces that cover the communicating holes of the inner plug member extend upward as they move radially inward, so that when the contents inside the inner container pass upward through the communicating holes, the covering pieces rotate smoothly upward around their radial outer ends, and as the covering pieces rotate in this manner, the opening of the communicating holes gradually widens, making it easier to dispense even contents with a relatively high viscosity. Since the multiple covering pieces extend upward as they move radially inward, even if the inner container is deformed or an impact force is applied to the double container, the contents that have passed upward through the communicating holes are less likely to flow back into the inner container, and can be left inside the discharge hole and fixed cylinder, thereby preventing outside air from entering the inner container. The opening peripheral edge of the communicating hole on the upper surface of the inner plug member has a protruding portion that protrudes radially inward from the opening edge at the lower end of the fixed tube, which makes it possible to prevent the covering piece from extending downward as it moves radially inward, and reliably makes it difficult for the contents that pass upward through the communicating hole to flow back into the interior of the inner container.

[0008] The protruding portion on the upper surface of the inside plug member may extend upward as it moves radially inward.

[0009] Since the protruding portion on the upper surface of the inside plug member extends upward as it moves radially inward, it is possible to reliably prevent the covering piece from assuming a position in which it extends downward as it moves radially inward.

[0010] The inner peripheral surface of the fixed tube may have a lower end portion that is connected to the lower end opening edge of the fixed tube, and may have a receiving surface that extends radially inward as it moves upward and faces the upper surface of the covering piece in the vertical direction.

[0011] Since a receiving surface is formed at the lower end of the inner peripheral surface of the fixed barrel, which extends radially inward as it extends upward and faces the upper surface of the covering piece in the vertical direction, when the covering piece rotates upward around the outer end in the radial direction, the upper surface of the covering piece abuts against the receiving surface, making it possible to restrict further rotation of the covering piece and suppressing the covering piece from becoming difficult to return to its original position downward after the contents are discharged. This makes it possible to reliably prevent the contents that pass upward through the communicating hole from flowing back into the inner container.

[0012] When the covering piece rotates upward around its radially outer end and the upper surface of the covering piece abuts against the receiving surface, the radially inner end of the covering piece may protrude radially inward from the receiving surface.

[0013] When the covering piece rotates upward around its radial outer end and the upper surface of the covering piece abuts against the receiving surface of the fixed cylinder, the radial inner end of the covering piece protrudes radially inward from the receiving surface. Therefore, after the contents are discharged, the radial inner end of the covering piece can be embedded in the contents inside the fixed cylinder, and the contents that pass upward through the communicating hole can be reliably left inside the discharge hole and the fixed cylinder, making it less likely to flow back toward the inside of the inner container.

[0014] When the upper surface of the covering piece abuts against the receiving surface, the protruding length of the radial inner end of the covering piece from the receiving surface may be smaller than the circumferential size of the radial inner end edge of the covering piece.

[0015] When the upper surface of the covering piece is in contact with the receiving surface, the protruding length of the radial inner end of the covering piece from the receiving surface is smaller than the circumferential size of the radial inner edge of the covering piece.Therefore, when the upper surface of the covering piece is in contact with the receiving surface, it is possible to prevent the portion of the radial inner end of the covering piece that protrudes radially inward from the receiving surface from bending and deforming in the vertical direction, and the contents that pass upward through the communicating hole can be reliably supported by the protruding portion of the covering piece, making it less likely that they will flow back toward the inside of the inner container.

[0016] An air intake hole is formed in the top wall of the cap body, connecting the outside of the cap body with the outside air introduction hole through the inside of the cap body, and an air valve is provided between the top wall of the cap body and the inner plug member, which opens and closes the air intake hole, allowing outside air to flow from the outside of the cap body into the inside of the cap body through the air intake hole and regulating the flow in the opposite direction, and the air valve opens the air intake hole when negative pressure is created between the outer container and the inner container, and the air valve may be formed integrally with the multiple covering pieces.

[0017] Since an air valve is provided, the intake hole opens when negative pressure is created between the outer container and the inner container, allowing outside air to reach the outside air inlet hole through the intake hole and the inside of the cap body, ensuring the production of a double container that can smoothly reduce the volume of the inner container as the contents are discharged. Since the air valve is formed integrally with the plurality of covering pieces, an increase in the number of parts can be suppressed. [Effects of the Invention]

[0018] According to the above aspect of the present invention, even contents with a relatively high viscosity can be easily discharged. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a vertical cross-sectional view of a discharge container having a discharge cap according to an embodiment. [Figure 2] FIG. 2 is a bottom view of a portion in FIG. 1 where a plurality of cover plates are provided. [Figure 3] FIG. 2 is a diagram showing a state in which the content is being discharged in the discharge container of FIG. [Figure 4] FIG. 2 is a diagram showing the state of the dispensing container of FIG. 1 after the content has been dispensed and before the lid is closed. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, a discharge cap according to one embodiment will be described with reference to the drawings. The discharge cap 1 is attached to the mouth 51 of a double container 50 which is made up of a mouth 51, a shoulder 52, a body, and a bottom, which are arranged in this order from top to bottom along a central axis O. Hereinafter, the direction intersecting the central axis O as viewed from the top-bottom direction will be referred to as the radial direction, and the direction going around the central axis O as viewed from the top-bottom direction will be referred to as the circumferential direction.

[0021] The double container 50 comprises an inner container 50a that shrinks and deforms as the contents stored therein decrease, an outer container 50b in which the inner container 50a is housed, and an outside air inlet 50c that introduces outside air between the outer container 50b and the inner container 50a as the contents decrease. 4 mPa·s or more) Examples include wasabi paste and mustard paste. In the illustrated example, the double container 50 is a peelable laminate container in which the inner container 50a is peelably laminated to the inner surface of the outer container 50b. The inner container 50a and the outer container 50b are made of a resin material such as PP (polypropylene), PE (polyethylene), or PET (polyethylene terephthalate), and may be made of the same material or different materials as long as they are a peelable combination.

[0022] A flange is formed at the upper end of the mouth of the inner container 50a, protruding radially outward and extending continuously over the entire circumferential length, and is placed on the upper opening edge of the mouth of the outer container 50b. The outside air introduction hole 50c is formed at the mouth of the outer container 50b. The position where the outside air introduction hole 50c is formed is not limited to the mouth of the outer container 50b, but may be, for example, in the body, shoulder, or bottom of the outer container 50b other than the mouth, or may be between the upper opening edge of the mouth of the outer container 50b and the underside of the flange portion of the mouth of the inner container 50a. A sealed portion 50d is formed on the outer peripheral surface of the mouth of the outer container 50b in a portion located below the outside air inlet hole 50c, and extends continuously around the entire circumference. The outer diameter of the sealed portion 50d is the largest among the portions of the mouth of the outer container 50b. The sealed portion 50d is formed at the lower end of the mouth of the outer container 50b. An engagement portion 50e for engaging the discharge cap 1 is formed on the outer peripheral surface of the opening of the outer container 50b, above the outside air introduction hole 50c. The engagement portion 50e is male threaded. The engagement portion 50e is not limited to a male thread and may be modified as appropriate, for example, by employing a protrusion for undercut fitting.

[0023] The discharge cap 1 includes a cap body 11, an inner plug member 12, and a covering piece 13.

[0024] The cap body 11 is formed in a cylindrical shape with a top, and is disposed coaxially with the central axis O. A female thread portion that screws into the engaging portion 50e of the outer container 50b is formed on the inner peripheral surface of the peripheral wall of the cap body 11. The sealed portion 50d of the outer container 50b is airtightly fitted into the lower end of the peripheral wall of the cap body 11. A discharge hole 15 for the contents is formed in the top wall 14 of the cap body 11. The discharge hole 15 is disposed coaxially with the central axis O. An upwardly extending discharge tube 22 is formed around the opening periphery of the discharge hole 15 in the top wall 14. A downwardly extending fixed tube 16 is formed around the opening periphery of the discharge hole 15 in the top wall 14. An air intake hole 17 is formed in the top wall 14, connecting the outside of the cap body 11 with the outside air introduction hole 50c through the inside of the cap body 11. The air intake hole 17 is formed in a portion of the top wall 14 located between the discharge tube 22 and the fixed tube 16 and a hinge portion 26, which will be described later.

[0025] A lid body 23 is connected to the cap body 11 via a hinge portion 26. The discharge hole 15 is opened and closed by rotating the lid body 23 in the vertical direction around the hinge portion 26. The lid body 23 is formed with a seal tube 23a that is detachably fitted to the discharge tube 22. The lid 23 may be detachably attached to the cap body 11 by screwing. The cap body 11 does not have to have the discharge tube 22.

[0026] The inner plug member 12 is disposed between the top wall 14 of the cap body 11 and the mouth 51 of the double container 50, and covers the upper opening of the mouth 51. A communication hole 18 is formed in the inner plug member 12, penetrating the inner container 50a in the vertical direction and connecting the interior of the inner container 50a with the discharge hole 15. The communication hole 18 is disposed coaxially with the central axis O. The inner plug member 12 is provided with an annular groove 24 that opens upward and extends continuously around the entire circumference. The upper opening of the annular groove 24 opens into the upper surface of the inner plug member 12. The annular groove 24 is disposed coaxially with the central axis O, and surrounds the communication hole 18 from the radial outside.

[0027] A cylindrical body 25 is fitted into and fixed to the annular groove portion 24. The upper part of the cylindrical body 25 protrudes upward from the upper end opening of the annular groove portion 24, and is fitted onto the outside of the fixed cylinder 16 of the cap body 11 and fixed thereto. An air valve 19 is provided between the top wall 14 of the cap body 11 and the inner plug member 12. The air valve 19 opens and closes the air intake hole 17, allowing outside air to flow from the outside of the cap body 11 into the inside of the cap body 11 through the air intake hole 17 and restricting the flow in the reverse direction. The air valve 19 opens the air intake hole 17 when negative pressure is created between the outer container 50b and the inner container 50a. The air valve 19 protrudes radially outward from the outer peripheral surface of the upper part of the cylindrical body 25 and extends continuously around the entire circumference. The radially outer end of the air valve 19 airtightly contacts the lower surface of the top wall 14 of the cap body 11 so as to be releasable downward. The radially outer end of the air valve 19 is located radially outward from the air intake hole 17. The air valve 19 is formed so as to be elastically deformable in the vertical direction.

[0028] The portion of the opening periphery of the communication hole 18 on the upper surface of the inside plug member 12 that is close in the vertical direction to the lower end opening edge of the fixed barrel 16 of the cap body 11 (hereinafter referred to as the abutment surface 12a) is a flat surface facing upward. The abutment surface 12a extends radially inward from the upper end opening of the annular groove portion 24. The opening periphery of the communication hole 18 on the upper surface of the inside plug member 12 has a protruding portion 12b that protrudes radially inward from the abutting surface 12a (the lower end opening edge of the fixed barrel 16). The protruding portion 12b extends upward as it moves radially inward.

[0029] The covering pieces 13 extend radially inward from the opening periphery of the communicating hole 18 on the upper surface of the inside plug member 12, covering the communicating hole 18. A plurality of covering pieces 13 are provided along the circumferential direction (around the central axis of the communicating hole). The covering pieces 13 extend upward as they extend radially inward, and are provided so as to be rotatable in the vertical direction around their radially outer ends. The radially outer ends of the covering pieces 13 are vertically sandwiched and fixed between abutment surfaces 12a on the upper surface of the inside plug member 12 and the lower end opening edge of the fixed tube 16 of the cap body 11.

[0030] The covering piece 13 is formed in a plate shape with its front and back surfaces facing up and down. As shown in FIG. 2, the circumferential size of the covering piece 13 decreases radially inward. The covering piece 13 is trapezoidal when viewed from the top and bottom. A circumferential gap is provided between adjacent covering pieces 13 in the circumferential direction. This gap narrows radially inward when viewed from the top and bottom. The radial inner end of the covering piece 13 is spaced radially outward from the central axis O. As a result, the radial center of the communicating hole 18 is not covered by the covering piece 13 and is open in the vertical direction. In this case, even contents containing solids can be easily dispensed.

[0031] The covering piece 13 protrudes radially inward from the inner peripheral surface of the cylindrical body 25. The covering piece 13 is formed integrally with the cylindrical body 25 and the air valve 19. The covering piece 13 is located below the air valve 19.

[0032] Here, on the inner peripheral surface of the fixed barrel 16 of the cap body 11, at the lower end portion that is continuous with the lower end opening edge of the fixed barrel 16, there is formed a receiving surface 16a that extends radially inward as it goes upward and that faces the upper surface of the covering piece 13 in the vertical direction. The inclination angle of the receiving surface 16a with respect to the horizontal direction that is perpendicular to the vertical direction is larger than the inclination angle of the protruding portion 12b. In a vertical cross section, the length of the receiving surface 16a is longer than the length of the protruding portion 12b.

[0033] When the covering piece 13 rotates upward around its radially outer end and the upper surface of the covering piece 13 abuts against the receiving surface 16a, the radially inner end of the covering piece 13 protrudes radially inward from the receiving surface 16a. With the upper surface of the covering piece 13 abutting against the receiving surface 16a, the protruding length A of the radially inner end of the covering piece 13 from the receiving surface 16a is smaller than the circumferential size B of the radially inner edge of the covering piece 13.

[0034] A step 16b that protrudes radially inward and connects to the upper end of the receiving surface 16a is formed on the inner peripheral surface of the fixed barrel 16. The step 16b faces upward and extends continuously around the entire circumference. As a result, the contents that have passed upward over the step portion 16b are caught by the step portion 16b, making it difficult for them to flow back toward the inside of the inner container 50a, and allowing them to remain inside the fixed barrel 16. It is not necessary to form the step portion 16b on the fixed barrel 16.

[0035] In the above configuration, when the body of the outer container 50b is pressed radially inward and elastically deformed with the discharge hole 15 facing downward, the contents of the inner container 50a rotates the covering piece 13 upward around the outer end in the radial direction, and is discharged from the discharge hole 15 while the upper surface of the covering piece 13 abuts against the receiving surface 16a of the fixed tube 16, as shown in Figure 3. At this time, the inner container 50a is deformed and reduced in volume. Although the internal pressure between the outer container 50b and the inner container 50a increases, this internal pressure is exerted on the air valve 19 through the outside air introduction hole 50c and the inside of the cap body 11, and the air valve 19 is pressed against the underside of the top wall 14 of the cap body 11, thereby maintaining the closed state of the air intake hole 17 by the air valve 19.

[0036] Next, when the pressure on the body of the outer container 50b is released, the outer container 50b undergoes restoration and deformation, causing the internal pressure between the outer container 50b and the inner container 50a to become negative. This negative pressure is exerted on the air valve 19 through the outside air inlet hole 50c and the inside of the cap body 11, causing the air valve 19 to move downward from the underside of the top wall 14 of the cap body 11, opening the air intake hole 17, and allowing outside air to reach the outside air inlet hole 50c through the air intake hole 17 and the inside of the cap body 11 and be supplied between the outer container 50b and the inner container 50a, maintaining the volume reduction deformation of the inner container 50a. At this time, as shown in FIG. 4, the covering piece 13 is slightly restored downward and moves away from the receiving surface 16a of the fixed barrel 16 downward.

[0037] As described above, according to the discharge cap 1 of this embodiment, the multiple covering pieces 13 covering the communicating holes 18 of the inner plug member 12 extend upward as they move radially inward. Therefore, when the contents inside the inner container 50a pass upward through the communicating holes 18, the covering pieces 13 rotate smoothly upward around their radial outer ends. As the covering pieces 13 rotate in this manner, the openings of the communicating holes 18 gradually widen, making it easier to dispense even contents with a relatively high viscosity.

[0038] Since the multiple covering pieces 13 extend upward as they move radially inward, even if the inner container 50a is deformed or an impact force is applied to the double container 50, the contents that have passed upward through the communicating hole 18 are less likely to flow back into the inner container 50a, and can be left inside the discharge hole 15 and the fixed cylinder 16, respectively, thereby preventing outside air from entering the inner container 50a.

[0039] The opening periphery of the communicating hole 18 on the upper surface of the inner plug member 12 has a protruding portion 12b that protrudes radially inward from the opening edge at the lower end of the fixed tube 16, which makes it possible to prevent the covering piece 13 from assuming a position in which it extends downward as it moves radially inward, and reliably makes it difficult for the contents that pass upward through the communicating hole 18 to flow back toward the inside of the inner container 50a.

[0040] Since the protruding portion 12b on the upper surface of the inside plug member 12 extends upward as it moves radially inward, it is possible to reliably prevent the covering piece 13 from assuming a position in which it extends downward as it moves radially inward.

[0041] A receiving surface 16a is formed at the lower end of the inner peripheral surface of the fixed tube 16, extending radially inward as it extends upward and facing the upper surface of the covering piece 13 in the vertical direction. When the covering piece 13 rotates upward around the outer end in the radial direction, the upper surface of the covering piece 13 abuts against the receiving surface 16a, thereby restricting further rotational movement of the covering piece 13 and preventing the covering piece 13 from becoming difficult to return to its original position downward after the contents are discharged. This reliably makes it difficult for the contents that pass upward through the communicating hole 18 to flow back into the inner container 50a.

[0042] When the covering piece 13 rotates upward around its radial outer end and the upper surface of the covering piece 13 abuts against the receiving surface 16a of the fixed cylinder 16, the radial inner end of the covering piece 13 protrudes radially inward from the receiving surface 16a. Therefore, after the contents are discharged, the radial inner end of the covering piece 13 can be embedded in the contents inside the fixed cylinder 16, and the contents that have passed upward through the communicating hole 18 can be reliably left inside the discharge hole 15 and the fixed cylinder 16, making it less likely that they will flow back toward the inside of the inner container 50a.

[0043] When the upper surface of the covering piece 13 abuts against the receiving surface 16a, the protruding length of the radial inner end of the covering piece 13 from the receiving surface 16a is smaller than the circumferential size of the radial inner edge of the covering piece 13. Therefore, when the upper surface of the covering piece 13 abuts against the receiving surface 16a, it is possible to prevent the portion of the radial inner end of the covering piece 13 that protrudes radially inward from the receiving surface 16a from bending and deforming in the vertical direction, and the contents that pass upward through the communicating hole 18 can be reliably supported by the protruding portion of the covering piece 13, making it less likely that they will flow back toward the inside of the inner container 50a.

[0044] Since an air valve 19 is provided, when negative pressure is created between the outer container 50b and the inner container 50a, the air intake hole 17 opens, and outside air reaches the outside air introduction hole 50c through the air intake hole 17 and the inside of the cap body 11, thereby reliably obtaining a double container 50 that can smoothly reduce the volume of the inner container 50a as the contents are discharged. Since the air valve 19 is formed integrally with the plurality of covering pieces 13, an increase in the number of parts can be suppressed.

[0045] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0046] The protruding portion 12b on the upper surface of the inside plug member 12 may extend straight in the radial direction. The receiving surface 16a does not necessarily have to be formed on the inner peripheral surface of the fixed barrel 16. When the upper surface of the covering piece 13 abuts against the receiving surface 16a, the radial inner end of the covering piece 13 may be located at the same radial position as the radial inner end of the receiving surface 16a, or may be located radially inward. When the upper surface of the covering piece 13 abuts against the receiving surface 16a, the protruding length A of the radial inner end of the covering piece 13 from the receiving surface 16a may be greater than or equal to the circumferential size B of the radial inner end edge of the covering piece 13. The air intake hole 17 does not have to be formed in the top wall 14 of the cap body 11, and the air valve 19 does not have to be provided between the top wall 14 of the cap body 11 and the inner plug member 12. The air valve 19 may be formed separately from the plurality of covering pieces 13 .

[0047] In addition, within the scope of the spirit of the present invention, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and the above-described variations may be combined as appropriate.

[0048] The aspects of the present invention are as follows, for example. <1> a cylindrical cap body with a top wall formed with a discharge hole for the contents, the cap body being attached to the opening of a double container comprising an inner container that shrinks and deforms as the contents contained therein decrease, an outer container in which the inner container is housed, and an outside air inlet hole that introduces outside air between the outer container and the inner container as the contents decrease; an inner plug member provided between the top wall of the cap body and the mouth portion, covering an upper end opening of the mouth portion and having a communication hole formed therein that connects the interior of the inner container with the discharge hole; a plurality of covering pieces extending radially inward from an opening peripheral edge of the communication hole on the upper surface of the inside plug member, the covering pieces intersecting the central axis as viewed from the up-down direction, and covering the communication hole; the plurality of covering pieces are arranged around the central axis of the communication hole, a fixing cylinder extending downward from the opening periphery of the discharge hole in the top wall of the cap body, the fixing cylinder sandwiching and fixing the radially outer end of the covering piece between the opening periphery of the communication hole in the upper surface of the inner plug member and the fixing cylinder; an opening peripheral edge portion of the communication hole on the upper surface of the inside plug member has a protruding portion that protrudes radially inward from a lower end opening edge of the fixed barrel that abuts against a radially outer end portion of the covering piece, The plurality of covering pieces extend upward as they move radially inward, and are provided around their radially outer ends so as to be rotatable in the up-and-down direction. <2> The protruding portion on the upper surface of the inside plug member extends upward as it moves radially inward. <1> The discharge cap according to claim 1. <3> a receiving surface extending radially inward as it extends upward and facing the upper surface of the covering piece in the up-down direction is formed at a lower end of the inner peripheral surface of the fixed barrel, the receiving surface being continuous with the lower end opening edge of the fixed barrel; <1> or <2> The discharge cap according to claim 1. <4> When the covering piece rotates upward around the outer end in the radial direction and the upper surface of the covering piece abuts against the receiving surface, the inner end in the radial direction of the covering piece protrudes radially inward from the receiving surface. <3> The discharge cap according to claim 1. <5> When the upper surface of the covering piece is in contact with the receiving surface, the length of the radially inner end of the covering piece projecting from the receiving surface is smaller than the circumferential size of the radially inner end edge of the covering piece. <4> The discharge cap according to claim 1. <6> an air intake hole is formed in the top wall of the cap body, the air intake hole communicating with the outside of the cap body through the inside of the cap body; an air valve is provided between the top wall of the cap body and the inner plug member to open and close the air intake hole, allowing outside air to flow from the outside of the cap body through the air intake hole into the inside of the cap body and regulating the flow in the reverse direction; the air valve opens the air intake hole when a negative pressure is created between the outer container and the inner container; The air valve is integrally formed with the plurality of covering pieces. <1> from <5> 10. The discharge cap according to claim 9, wherein the discharge cap is a discharge cap having a diameter of 100 mm or more. [Explanation of symbols]

[0049] 1 Discharge cap 11 Cap body 12 Inner plug member 12b Overhang 13 Covering piece 14 Top wall 15 Discharge hole 16 Fixed tube 16a Receiver 17 Air intake 18 Communication hole 19 Air valve 50 double container 51 Mouth 50a inner container 50b outer container 50c Outside air intake A Projection length B Circumferential size O center axis

Claims

1. a cylindrical cap body with a top wall formed with a discharge hole for the contents, the cap body being attached to the opening of a double container comprising an inner container that shrinks and deforms as the contents contained therein decrease, an outer container in which the inner container is housed, and an outside air inlet hole that introduces outside air between the outer container and the inner container as the contents decrease; an inner plug member provided between the top wall of the cap body and the mouth portion, covering an upper end opening of the mouth portion and having a communication hole formed therein that connects the interior of the inner container with the discharge hole; a plurality of covering pieces extending radially inward from an opening peripheral edge of the communication hole on the upper surface of the inside plug member, the covering pieces intersecting the central axis as viewed from the up-down direction, and covering the communication hole; the plurality of covering pieces are arranged around the central axis of the communication hole, a fixing cylinder extending downward from the opening periphery of the discharge hole in the top wall of the cap body, the fixing cylinder sandwiching and fixing the radially outer end of the covering piece between the opening periphery of the communication hole in the upper surface of the inner plug member and the fixing cylinder; an opening peripheral edge portion of the communication hole on the upper surface of the inside plug member has a protruding portion that protrudes radially inward from a lower end opening edge of the fixed barrel that abuts against a radially outer end portion of the covering piece, The plurality of covering pieces extend upward as they move radially inward, and are provided around their radially outer ends so as to be rotatable in the up-and-down direction.

2. The discharge cap according to claim 1 , wherein the protruding portion on the upper surface of the inside plug member extends upward as it moves radially inward.

3. 3. The discharge cap according to claim 1, wherein the inner peripheral surface of the fixed tube has a lower end portion that is connected to the lower end opening edge of the fixed tube, and a receiving surface that extends radially inward as it extends upward and faces the upper surface of the covering piece in the vertical direction.

4. 4. The discharge cap according to claim 3, wherein when the covering piece rotates upward around its radially outer end and the upper surface of the covering piece abuts against the receiving surface, the radially inner end of the covering piece protrudes radially inward from the receiving surface.

5. 5. The discharge cap according to claim 4, wherein when the upper surface of the covering piece abuts against the receiving surface, the protruding length of the radial inner end of the covering piece from the receiving surface is smaller than the circumferential size of the radial inner end edge of the covering piece.

6. an air intake hole is formed in the top wall of the cap body, the air intake hole communicating with the outside of the cap body through the inside of the cap body; an air valve is provided between the top wall of the cap body and the inner plug member to open and close the air intake hole, allowing outside air to flow from the outside of the cap body through the air intake hole into the inside of the cap body and regulating the flow in the reverse direction; the air valve opens the air intake hole when a negative pressure is created between the outer container and the inner container; The discharge cap according to claim 1 or 2, wherein the air valve is integrally formed with the plurality of covering pieces.

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