JP2017193352A - cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap capable of returning a part of a content not discharged into a container after use of the content, and sealing the inside of the container after a short time.SOLUTION: A cap body comprises: a discharge passage for discharging a content in a container; a communication hole 25 communicating the discharge passage with a container mouth part; an annular valve seat 26 provided around the communication hole 25; and a check valve which opens and closes the communication hole 26 by seating or separating an annular valve part on or from the annular valve seat 26. A protrusion 27 extending in a radial direction and protruding with a smooth curved surface is formed at a position of the annular valve seat 26 on the opposite side of a hinge 6. As a result, a part of the content not discharged is returned into the container through a gap around the protrusion 27 between the annular valve part and the annular valve seat 26 after use of the content, and the inside of the container can be sealed after a short time.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cap molded from a synthetic resin, and more particularly to a cap that is attached to a container mouth portion of a container filled with a liquid content such as soy sauce or a fluid content having viscosity, and that opens and closes by the pressure in the container. Is.

  If the cap is weak after using the above-mentioned contents, the sealed state inside the container cannot be maintained, and air or fungi will enter the container, causing the contents to oxidize or proliferate, etc. There was a problem. In order to solve this problem, the cap attached to the container mouth is squeezed into the body of the container to apply internal pressure to the container, and the user operates the cap by hand immediately after using an appropriate amount of contents. There has been proposed one that seals the inside of the container (the mouth of the container) without any problems.

  For example, in Patent Document 1, a cap main body fitted to a container mouth portion includes a discharge passage communicating with the container mouth portion, a base portion fitted into the discharge passage and having a discharge hole, A check valve disposed on the base portion and allowing only discharge of the contents from the discharge hole, the check valve being fitted into the discharge passage, and the cylindrical portion A plurality of elastically deformable elastic pieces extending radially toward the center so as to form a gap from the inner wall surface thereof, and integrally connected to the tips of the respective elastic pieces, and downstream of the discharge holes in the discharge direction. And the valve member that opens and closes the discharge hole, and when the internal pressure to the container is released, each elastic piece of the check valve is restored, so that the valve member closes the discharge hole and seals the inside of the container It is disclosed to maintain.

  However, in the invention of Patent Document 1, after the contents are discharged, the check valve is operated so that the contents not discharged from the discharge passage remain in the discharge passage without returning to the container. When the lid is closed, the contents may be scattered by the cylindrical closed portion of the lid, and when the lid is closed and reopened, the contents may adhere to the cylindrical closed portion of the lid There was also a need to improve.

  In view of this, Patent Document 2 as a proposed prior art that should take measures against this has an inner plug member that closes the container opening, and a discharge port that covers the inner plug member and discharges the contents. A tubular body body member, and the inner plug member is formed with a communication hole that communicates the discharge port and the inside of the container. The communication hole is elastically displaced along the axial direction of the communication hole. The valve body part for opening and closing the communication hole is disposed, and a flow allowing groove for allowing the content to flow is formed in a part of the valve seat of the valve body part in contact with the valve body part. It is a discharge cap, and after discharging the contents, it is disclosed to return the contents that have not been discharged to the outside from the discharge port into the container through the flow allowance groove.

JP 2013-241197 A JP2015-155333A

  However, in the invention according to Patent Document 2, a flow-permissible groove that is closed by the surface tension due to the contents is adopted at the final stage when the valve body is seated on the valve seat. It is very difficult to specify the specific shape of the groove, and the shape may be considerably complicated. Furthermore, there are various kinds of contents, and it is necessary to specify the specific shape of the flow-permissible groove depending on the kind of contents (the viscosity of the contents), which cannot be adopted.

  The present invention has been made in view of such a point, and without adopting the equivalent of a distribution groove having a complicated shape, a part of the content that has not been discharged to the outside after use of the content is contained in the container. An object of the present invention is to provide a cap capable of returning and sealing the inside of the container after a short time.

As a means for solving the above-mentioned problems, the present invention described in claim 1 is a cap made of synthetic resin provided with a cylindrical cap body to be attached to a container mouth, wherein the cap body Is a discharge passage for discharging the contents in the container, a communication hole for communicating the discharge passage and the container opening, an annular valve seat provided around the communication hole, and an axial direction of the communication hole. And a check valve that opens and closes the communication hole when the annular valve portion is seated on or removed from the annular valve seat, and is either of the annular valve portion and the annular valve seat. One or both contact surfaces are formed with a convex portion that extends in the radial direction and protrudes with a gently curved surface, the cap is attached to the container mouth, and the annular shape is used after the contents in the container are used. In the initial stage when the valve portion is seated on the annular valve seat, the annular valve portion and Serial is revealing a gap surrounding the projecting portion with the annular valve seat, in which the gap then with the passage of time, characterized in that it is closed.
According to the first aspect of the present invention, when the contents are used, if the body portion of the container is squeezed and an internal pressure is applied to the container, the check valve is elastically displaced along the axial direction of the communication hole by the internal pressure of the container. The valve part is detached from the annular valve seat and the communication hole is opened, and the contents are discharged from the discharge passage to the outside through the communication hole. On the other hand, when the internal pressure on the container is released, the check valve is restored and the annular valve portion is seated on the annular valve seat, so the communication hole is closed and the container can be quickly kept sealed. Inflow of air into the container can be suppressed.

  In particular, when the internal pressure to the container is released, the annular valve portion of the check valve is displaced and seated toward the annular valve seat by the suction force and elastic force due to the internal pressure release, but in the initial stage of the seating, A short period of time in which a minimal gap appears around the convex portion between the annular valve portion and the annular valve seat is obtained. During this short period of time, a part of the contents that have not been discharged to the outside returns from the gap into the container. Thereafter, the opening area of the gap around the convex portion between the annular valve portion and the annular valve seat gradually decreases due to the suction force due to the release of the internal pressure and the pressing force from the annular valve portion to the annular valve seat, and the annular valve portion Since the ring valve seat and the annular valve seat are almost in close contact with each other and the surface tension of the contents also acts, the gap around the convex portion between the annular valve portion and the annular valve seat is closed. The inside can be kept sealed.

  In the first aspect of the invention, the convex portion provided on the annular valve seat protrudes with a gentle curved surface, and the shape thereof is simple. In addition, the height dimension and width dimension of the convex portion may be specified depending on the type of content (viscosity of the content), and the shape is not complicated.

The invention described in claim 2 is the invention described in claim 1, wherein the width dimension W1 along the radial direction of the annular valve portion is smaller than the width dimension W2 along the radial direction of the annular valve seat. It is what.
In the invention of claim 2, after the internal pressure to the container is released and a part of the contents not discharged to the outside returns to the container from the gap between the annular valve portion and the annular valve seat, the annular valve The adhesion between the part and the annular valve seat can be improved.

The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the synthetic resin for molding the check valve is more elastic than the synthetic resin for molding the annular valve seat. To do.
In the invention of claim 3, the internal pressure to the container is released, and a part of the contents not discharged to the outside is returned to the container from the gap between the annular valve part and the annular valve seat. The adhesion between the valve portion and the annular valve seat can be further improved.

  According to the cap of the present invention, after using the contents, a part of the contents which have not been discharged are returned to the container without using an equivalent of a distribution groove having a complicated shape, and after a short time, Can be sealed.

FIG. 1 is a cross-sectional view of a cap according to an embodiment of the present invention. 2A is a plan view of the main cap body including the lid body in FIG. 1, FIG. 2B is a cross-sectional view of FIG. 2A, and FIG. It is an expanded sectional view which follows an A line. 3A is a plan view of the check valve of FIG. 1, FIG. 3B is a cross-sectional view of FIG. 3A, and FIG. 3C is a bottom view. 4A is a plan view of the guide cylindrical body of FIG. 1, and FIG. 4B is a cross-sectional view of FIG. FIG. 5 is a view showing the operation of the cap in stages. FIG. 6 is a diagram showing in a stepwise manner how the annular valve portion is seated on the annular valve seat. Fig.7 (a) is sectional drawing of the cap which concerns on other embodiment, (b) is the B section enlarged view of (a).

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, a cap 1 according to an embodiment of the present invention is fitted into a container mouth 3 of a container 2 and has a communication hole 25 for contents, and the cap body 4 is crowned. And the lid body 5 to be configured. A lid 5 is integrally connected to a main cap 11 constituting a part of the cap body 4 via a hinge 6. The cap 1 is constructed by assembling three constituent members: a main cap body 11 including the lid body 5 shown in FIG. 2, a check valve 12 shown in FIG. 3, and a guide cylindrical body 13 shown in FIG. The The lid 5 may be configured as a separate body without connecting the lid 5 to the main cap body 11 via the hinge 6.

  As shown in FIG. 1, the container 2 is a container that is easily deformed, such as a tube container, and is filled with a liquid content or a fluid content having viscosity. Examples of the contents include soy sauce, olive oil, dressing, mayonnaise, ketchup, tonkatsu sauce, pasty mustard and the like. The container 2 is of a type in which contents are discharged by applying an internal pressure by, for example, squeezing the body 2a. The container mouth 3 is formed in a cylindrical shape. A fitting protrusion 15 is formed on the lower outer wall surface of the container mouth 3. On the upper part of the container mouth portion 3, a fitting groove portion 16 in which the entire peripheral wall portion is recessed inward is formed. In addition, this cap 1 can also be employ | adopted also as the double container (including what is called a peeling container) which consists of an outer container and an inner container, and is mounted | worn with the container mouth part 3 of an outer container. The inner container is flexible so that it is filled with the contents and deforms as the contents decrease. A suction valve is attached to the outer container so that the outside air is sucked between the outer container and the inner container in order to maintain the volume reduction shape of the inner container.

  As shown in FIG. 1, the cap body 4 includes a guide cylindrical body 13 having a discharge passage 41 for discharging the contents in the container 2, a communication hole 25 that connects the discharge passage 41 and the container mouth 3, and the The main cap body 11 having the annular valve seat 26 provided around the communication hole 25 and elastically displaced along the axial direction of the communication hole 25, the annular valve portion 29 of the valve body 36 is detached from the annular valve seat 26 or And a check valve 12 that is seated to open and close the communication hole 25. The synthetic resin for molding the check valve 12 is more elastic than the synthetic resin for molding the main cap body 11 including the lid 5. Specifically, the main cap body 11 and the guide cylindrical body 13 including the lid body 5 are formed of a resin such as polypropylene or polyethylene. The check valve 12 is formed of a flexible and highly elastic low-density polyethylene or elastomer and a mixed resin thereof.

  As shown in FIGS. 1 and 2, the main cap body 11 includes a cylindrical outer wall portion 18 fitted into the container mouth portion 3 and a cylindrical shape provided concentrically on the inner side of the cylindrical outer wall portion 18. The inner side wall part 19 and the annular horizontal wall part 20 which connects the upper end of the cylindrical outer wall part 18 and the upper end of the cylindrical inner wall part 19 are provided. An annular space 22 is formed between the cylindrical inner wall portion 19 and the cylindrical outer wall portion 18. The upper inner wall surface of the cylindrical inner wall portion 19 is formed with an annular fitting recess 23 extending annularly along the circumferential direction.

  On the lower inner wall surface of the cylindrical inner wall portion 19, the annular wall portion 10 integrally extends obliquely upward from the entire circumferential direction toward the radial center. That is, the annular wall portion 10 integrally extends from the lower inner wall surface of the cylindrical inner wall portion 19 in a truncated cone shape. A space 24 having an open top is formed by the annular wall portion 10 and the inner wall surface of the cylindrical inner wall portion 19. A substantially circular communication hole 25 is opened at the radial center of the annular wall 10. The communication hole 25 communicates with the inside of the container mouth portion 3. The communication hole 25 is formed in the range of φ5.0 mm to φ12.0 mm. The periphery of the communication hole 25, specifically the substantially entire area of the inner wall surface of the communication hole 25, acts as the annular valve seat 26. The annular valve seat 26 is formed by an inverted conical surface (an annular tapered surface or a bowl-shaped surface expanded upward).

  As shown in FIGS. 2A and 2C, a convex portion 27 extends in the radial direction at a position on the opposite side of the annular valve seat 26 from the hinge 6. The convex portion 27 extends in the entire radial direction of the annular valve seat 26. The convex portion 27 protrudes with a gentle curved surface. The height dimension H of the convex part 27 is appropriately set within a range of 0.03 mm to 0.25 mm. Moreover, the width dimension W of the convex part 27 is suitably set within the range of 0.2 mm-5.0 mm. The height dimension H and the width dimension W of the convex portion 27 are set so that the annular valve portion 29 contacts the surface of the convex portion 27 when seated, taking into consideration that the convex portion 27 forms a gentle curved surface. While selecting a suitable shape, it sets suitably according to the viscosity of the content with which the container 2 is filled.

  As shown in FIGS. 1 and 2, the outer diameter of the annular horizontal wall portion 20 is smaller than the outer diameter of the cylindrical outer wall portion 18, and the protrusion locking portion 31 that extends annularly along the circumferential direction on the outer wall surface. Is formed. The lid 5 is fitted to the outer wall surface of the annular horizontal wall portion 20. On the lower surface of the annular horizontal wall portion 20, a cylindrical fitting portion 32, in which the upper end of the container mouth portion 3 is fitted, is suspended inside the cylindrical outer wall portion 18. The cylindrical fitting portion 32 is suspended concentrically with the cylindrical outer wall portion 18.

  As shown in FIGS. 1 and 3, the check valve 12 includes a cylindrical support portion 34 that contacts the inner wall surface of the cylindrical inner wall portion 19 of the main cap body 11, and an inner wall surface of the cylindrical support portion 34. Provided between each elastic piece 35 and a plurality of elastic pieces 35 that integrally extend toward the center in the radial direction, a valve body 36 that is integrally connected to the tip of each elastic piece 35 and opens and closes the communication hole 25. And a plurality of flow holes 37 through which the contents from the communication holes 25 flow.

As can be seen from FIG. 3, the valve body 36 includes a dome-shaped portion 36 a and an annular thin portion 36 b that integrally extends obliquely upward from the outer periphery of the dome-shaped portion 36 a. The dome-shaped portion 36a is formed so that its thickness gradually becomes thinner from the top toward the bottom. The lower end surface of the annular thin portion 36b of the valve body 36 is formed as an inverted conical surface (an annular tapered surface or bowl-shaped surface expanded upward) so as to be seated on the annular valve seat 26 (an inverted conical surface). . The lower end surface of the annular thin portion 36 b of the valve body 36 acts as the annular valve portion 29. The thickness of the annular thin portion 36b is appropriately set in the range of 0.2 mm to 0.5 mm. A spherical convex portion 38 projects from the upper surface of the valve body 36.
Each elastic piece 35 extends from the upper inner wall surface of the cylindrical support portion 34 toward the center in the radial direction and slightly curved downward. The distal end portion of each elastic piece 35 is integrally connected to the outer peripheral surface of the annular thin portion 36 b of the valve body 36. In the present embodiment, the elastic pieces 35 are formed at four positions with a 90 ° pitch in the circumferential direction, and the flow holes 37 are formed at four positions with a 90 ° pitch between the elastic pieces 35. The thickness of each elastic piece 35 is substantially the same as the thickness of the annular thin portion 36b of the valve body 36.

  As shown in FIGS. 1 and 4, the guide cylindrical body 13 is disposed above the check valve 12. The guide cylindrical body 13 extends downward from a cylindrical support portion 40 extending downward so as to be fitted to the cylindrical inner wall portion 19 of the main cap body 11, and from the radial center of the cylindrical support portion 40, The cylindrical guide part 42 which has the discharge channel | path 41 inside is comprised from the annular closed wall part 43 which connects the upper end of the cylindrical support part 40, and the lower end of the cylindrical guide part 42 integrally. The discharge passage 41 of the cylindrical guide portion 42 is communicated with the communication hole 25 of the main cap body 11. The annular closing wall 43 is formed with an annular flange 43 a that protrudes radially outward from the cylindrical support 40. The cylindrical support portion 40 is disposed above the cylindrical support portion 34 constituting the check valve 12. The thickness of the peripheral wall portion of the cylindrical support portion 40 and the thickness of the peripheral wall portion of the cylindrical support portion 34 of the check valve 12 are substantially the same. On the outer wall surface of the cylindrical support portion 40, an annular protrusion 44 extending in the circumferential direction is projected.

  As shown in FIGS. 1 and 2, the lid 5 is integrally connected to the cylindrical outer wall portion 18 of the main cap body 11 via a hinge 6. The lid body 5 is integrated with the cylindrical body portion 50 connected to the outer wall surface of the cylindrical outer wall portion 18 of the main cap body 11 via the hinge 6 and the entire circumferential direction of the upper end of the body portion 50. It is comprised from the top | upper surface part 51 connected to. A cylindrical regulation portion 55 that regulates the removal of the guide cylindrical body 13 is suspended from the top surface portion 51 inside the trunk portion 50. The cylindrical restricting portion 55 is provided concentrically with the trunk portion 50. At the central portion in the radial direction of the top surface portion 51, a cylindrical contact portion 52 that fits tightly into the discharge passage 41 in the cylindrical guide portion 42 of the guide cylindrical body 13 is suspended. On the lower inner wall surface of the body portion 50, a protrusion locking portion 53 that extends annularly in the circumferential direction is formed. On the opposite side of the outer wall surface of the body portion 50 from the hinge 6 side, a grip portion 54 to be gripped by the user protrudes outward in a predetermined range along the circumferential direction.

Next, a method for assembling the cap 1 and attaching it to the container mouth 3 will be described.
First, the check valve 12 is assembled on the upper surface of the annular wall portion 10 of the main cap body 11 from above. Specifically, the check valve 12 is arranged on the upper surface of the annular wall portion 10 so that the outer wall surface of the cylindrical support portion 34 of the check valve 12 is along the inner wall surface of the cylindrical inner wall portion 19 of the main cap body 11. To do. That is, the check valve 12 is incorporated into a space 24 that is open from above and surrounded by the annular wall portion 10 and the inner wall surface of the cylindrical inner wall portion 19.

  Next, the check cylindrical valve 13 is pushed from above so that the outer wall surface of the cylindrical support portion 40 extends along the inner wall surface of the cylindrical inner wall portion 19 of the main cap body 11. The annular protrusion 44 provided on the outer wall surface of the cylindrical support portion 40 of the built-in guide cylindrical body 13 is fitted into the annular fitting recess 23 provided on the inner wall surface of the cylindrical inner wall portion 19 of the main cap body 11. At the same time, the annular flange 43a of the guide cylinder 13 is brought into contact with the upper surface of the annular horizontal wall 20 and assembled. As a result, the annular valve portion 29 (the lower end surface of the annular thin portion 36b of the valve body 36) of the valve body 36 of the check valve 12 contacts the annular valve seat 26 (the inner wall surface of the communication hole 25) of the main cap 11. In addition, the lower end edge of the dome-shaped portion 36a of the valve body 36 and the lower end edge of the annular valve seat 26 come to coincide with each other. Further, since the valve body 36 of the check valve 12 is positioned above the position before the assembly, the annular valve portion 29 of the valve body 36 is caused by the downward biasing force (restoring force) of each curved elastic piece 35. However, the annular valve seat 26 of the annular wall portion 10 is pressed. Further, the cylindrical guide portion 42 of the guide cylindrical body 13 is located immediately above the valve main body 36 (communication hole 25) of the check valve 12. Thereby, the assembly of the cap body 4 is completed.

  Next, when the cap body 4 is covered with the lid body 5, the hinge 6 is bent so that the lid body 5 is covered from above the cap body 4. Then, the protrusion locking part 53 provided in the trunk | drum 50 of the cover body 5 engages so that it may get over the protrusion locking part 31 provided in the cyclic | annular horizontal wall part 20 of the main cap body 11. FIG. At the same time, the cylindrical contact portion 52 provided on the top surface portion 51 of the lid body 5 is closely fitted to the discharge passage 41 in the cylindrical guide portion 42 of the guide cylindrical body 13, and the top surface portion of the lid body 5. The cylindrical regulation part 55 provided in 51 comes to be located close to the cylindrical support part 40 of the guide cylindrical body 13 in the vicinity. Thereby, the assembly of the cap 1 is completed.

  Next, when the cap 1 is attached to the container mouth 3, the fitting recess 16 and the fitting protrusion 15 of the container mouth 3 are connected to the cylindrical inner wall 19 of the main cap body 11 and the cylinder. The cap 1 is inserted into the annular space 22 between the outer wall 18 and the upper outer wall surface of the container mouth 3 so as to be in close contact with the inner surface of the cylindrical fitting portion 32 of the main cap body 1. Fits into the container mouth 3. In the present embodiment, the method of mounting the cap 1 to the container mouth 3 by the stopper method has been described, but other mounting methods such as a screwing method may be used.

Next, the operation of the cap 1 according to the embodiment of the present invention will be described based on FIGS. 5 and 6 and also referring to FIGS. 1 and 2 as appropriate.
When using the contents, first, as shown in FIG. 5A, the lid 5 is opened to expose the guide cylindrical body 13 of the cap body 4 to the outside.
Next, as shown in FIG. 5 (b), the user tilts the container 2 so that the discharge passage 41 of the guide cylindrical body 13 faces downward, and in the discharge posture, the body 2a of the container 2 is placed. Squeezed to apply internal pressure to the container 2. Then, the internal pressure of the container 2 acts on the entire lower wall surface of the valve body 36 of the check valve 12, so that the check valve 12 is elastic along the axial direction of the communication hole 25 while each elastic piece 35 is bent. By deforming, the annular valve portion 29 of the valve body 36 (the lower end surface of the annular thin portion 36b of the valve body 36) is detached from the annular valve seat 26 (the inner wall surface of the communication hole 25) around the communication hole 25. As a result, the communication hole 25 is opened, and an appropriate amount of contents gathers in the communication hole 25 along the lower wall surface of the annular wall portion 10 from inside the container mouth portion 3, and from the communication hole 25, the check valve 12 Via each flow hole 37, it reaches the discharge passage 41 of the cylindrical guide portion 42 of the guide cylindrical body 13 and is discharged to the outside.

  After that, after discharging an appropriate amount of the contents, when pressing the barrel 2a of the container 2 to stop and return the container 2 to the upright posture as shown in FIG. 5 (c), the internal pressure to the container 2 Therefore, each elastic piece 35 of the check valve 12 is restored by the suction force due to the release of the internal pressure and the elastic force of each elastic piece 35, and the annular valve portion 29 of the valve body 36 becomes the annular valve seat 26. The communication hole 25 is closed by the valve body 36 after sitting.

  At this time, as shown in FIG. 6B, in the initial stage when the internal pressure to the container 2 is released and the annular valve portion 29 of the check valve 12 is seated on the annular valve seat 26, the annular valve portion 29 and the annular valve A short time when the gap 30 appears around the convex portion 27 with the seat 26 is obtained. In this short time, as shown in FIG. 5 (c), a part of the contents that are not discharged to the outside and remain in the range from the space 24 on the annular wall portion 10 into the discharge passage 41 are removed from the annular valve. It returns to the inside of the container 2 through the gap 30 that appears around the convex portion 27 between the portion 29 and the annular valve seat 26. In the state of FIG. 6B, the annular valve portion 29 is already seated in a wide range of the annular valve seat 26 on the opposite side in the radial direction (hinge 6 side) from the annular valve seat 26 where the convex portion 27 is located. It is in a state of being.

Thereafter, as shown in FIG. 6 (c), the convex portion 27 between the annular valve portion 29 and the annular valve seat 26 is gradually brought about by the suction force due to the release of the internal pressure and the pressing force from the annular valve portion 29 to the annular valve seat 26. The opening area of the peripheral gap 30 gradually decreases, and the surface of the annular valve portion 29 (the lower end surface of the annular thin portion 36a of the valve main body 36) is projected on the annular valve seat 26 (the inner wall surface of the communication hole 25). 27, since the surface tension of the contents also acts so as to become familiar with each other, the gap 30 around the convex portion 27 between the annular valve portion 29 and the annular valve seat 26 is closed, and the container 2 The inside can be kept sealed.
In this way, immediately after use, the user does not manually operate the cap 1, and a part of the contents in the cap body 4 that has not been discharged is returned into the container 2, and the discharge passage of the guide cylindrical body 13. It is possible to suppress the content remaining in 41 (see FIG. 5D), and thereafter, the inside of the container 2 can be quickly sealed to suppress the inflow of air into the container 2.

Next, as shown in FIG. 5 (d), if the hinge 6 is bent and the lid body 5 is covered so as to cover from above the cap body 4, the protrusion locking provided on the trunk portion 50 of the lid body 5 is performed. The portion 53 is engaged so as to get over the protrusion locking portion 31 provided on the annular horizontal wall portion 20 of the main cap body 11, and the cylindrical contact portion 52 provided on the top surface portion 51 of the lid body 5 is guided. It fits tightly into the discharge passage 41 in the cylindrical guide portion 42 of the cylindrical body 13.
Then, by covering the cap body 4 with the cap body 4, it is possible to prevent foreign matter from entering the cap body 4 (the range from the space 24 on the annular wall portion 10 to the discharge passage 41 of the guide tubular body 13). In addition, the inside of the container 2 can be double sealed. And since the inside of the cap main body 4 is sealed by the cover body 5, the oxidation of the content which remained in the space 24 on the annular wall part 10 can be suppressed.

  As described above, in the cap 1 according to the embodiment of the present invention, the cap body 4 includes the discharge passage 41 that discharges the contents in the container 2, and the communication that connects the discharge passage 41 and the container mouth 3. A hole 25, an annular valve seat 26 provided around the communication hole 25, and elastic displacement along the axial direction of the communication hole 25, so that the annular valve portion 29 is seated on or removed from the annular valve seat 26, And a check valve 12 that opens and closes the communication hole 25, and is formed with a convex portion 27 extending in a radial direction at a position opposite to the hinge 6 of the annular valve seat 26 and projecting with a gently curved surface. Yes.

  In particular, at the initial stage when the internal pressure to the container 2 is released and the annular valve portion 29 of the check valve 12 is seated on the annular valve seat 26, a convex portion 27 between the annular valve portion 29 and the annular valve seat 26. A part of the contents that have not been discharged to the outside returns to the inside of the container 2 from the gap 30 in a short time when the gap 30 appears around the periphery. Thereafter, the surface of the annular valve portion 29 (the lower end surface of the annular thin portion 36a of the valve main body 36) is brought into close contact with the convex portion 27 of the annular valve seat 26, and the surface tension of the contents also contributes. Therefore, since the gap 30 around the convex portion 27 between the annular valve portion 29 and the annular valve seat 26 is closed, the inside of the container 2 can be maintained in a sealed state.

  As a result, when the content is used, a part of the content that has not been discharged is returned into the container 2, whereby the content remaining in the discharge passage 41 of the guide cylindrical body 13 can be suppressed. The cap body 4 is crowned to prevent the contents from being scattered when the cylindrical contact portion 52 of the lid body 5 is fitted into the discharge passage 41 of the guide tubular body 13. Can be prevented from adhering to the cylindrical contact portion 52. As described above, the cap 1 can be used to return the contents that have not been discharged to the discharge passage 41 after the contents have been used without manual operation by the user. In this way, the inside of the container 2 can be promptly sealed.

  In the cap 1 according to the embodiment of the present invention, the synthetic resin for molding the check valve 12 is more elastic than the synthetic resin for molding the main cap body 11 including the lid 5, that is, the annular valve portion 29 is annular. It is more elastic than the valve seat 26. Further, the annular thin portion 36 b of the valve main body 36, which is the annular valve portion 29, is formed to be thin with substantially the same thickness as each elastic piece 35. Thereby, after the internal pressure of the container 2 is released and a part of the content that has not been discharged returns into the container 2, the adhesion between the annular valve portion 29 and the annular valve seat 26 can be improved. .

  In the present embodiment, the convex portion 27 extending in the radial direction is formed on the annular valve seat 26, but the convex portion 27 extending in the radial direction may be formed on the annular valve portion 29. Further, the convex portions 27, 27 may be formed on the annular valve seat 26 and the annular valve portion 29, respectively, but when the annular valve portion 29 is seated on the annular valve seat 26, the convex portion 27 of the annular valve portion 29. It is better to arrange so that the convex part 27 of the annular valve seat 26 does not overlap.

Next, the cap 1 according to another embodiment will be described with reference to FIG. 7, but when the cap 1 according to this other embodiment is described, the cap 1 according to the embodiment shown in FIGS. Only the differences will be described.
In the cap 1 according to another embodiment, the valve body 36 of the check valve 12 is formed in a disc shape. A cylindrical valve portion 36c is suspended from the outer periphery of the valve body 36 downward. The lower end surface of the valve portion 36 c is formed as an inverted conical surface, and the lower end surface functions as the annular valve portion 29. The width dimension W1 along the radial direction of the annular valve portion 29 is formed smaller than the width dimension W2 along the radial direction of the annular valve seat 26. When the annular valve portion 29 is seated on the annular valve seat 26, the annular valve portion 29 is seated at a substantially radial center of the annular valve seat 26.
Thereby, after the internal pressure of the container 2 is released and a part of the content that has not been discharged returns into the container 2, the adhesion between the annular valve portion 29 and the annular valve seat 26 can be improved. .

  1 Cap, 2 Container, 3 Container Port, 4 Cap Body, 12 Check Valve, 25 Communication Hole, 26 Annular Valve Seat, 27 Convex, 29 Annular Valve, 30 Clearance, 41 Discharge Passage

Claims (3)

A cap made of synthetic resin with a cylindrical cap body attached to the container mouth,
The cap body is
A discharge passage for discharging the contents in the container;
A communication hole communicating the discharge passage and the container opening;
An annular valve seat provided around the communication hole;
A check valve that elastically displaces along the axial direction of the communication hole, and opens and closes the communication hole when the annular valve portion is seated on or removed from the annular valve seat;
The annular valve portion and the annular valve seat, either or both of the contact surfaces, extending in the radial direction, a convex portion protruding with a gently curved surface is formed,
In the initial stage where the cap is attached to the container mouth and the contents in the container are used, and the annular valve portion is seated on the annular valve seat, the annular valve portion is interposed between the annular valve seat and the annular valve seat. A cap characterized in that a gap appears around the convex portion, and then the gap is closed over time.   The width dimension W1 along the radial direction of the said annular valve part is smaller than the width dimension W2 along the radial direction of the said annular valve seat, The cap of Claim 1 characterized by the above-mentioned.   The cap according to claim 1 or 2, wherein the synthetic resin for molding the check valve has higher elasticity than the synthetic resin for molding the annular valve seat.

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