JP7378211B2 - synthetic resin cap - Google Patents

Description

The present invention relates to a cap used with an inner lid fitted into an outer lid, and more particularly to a synthetic resin cap having a structure capable of informing that proper sealing in resealing has been completed.

For example, containers filled with contents such as drinking water, medicines, and medical solutions are widely used. A cap that can be opened and closed is attached to the mouth of such a container, which serves as a spout, so that when not in use, the container is shut off from the outside air to preserve and seal the contents.

As one form of this cap, a screw-type cap that can achieve a constant tightening torque using a ratchet mechanism has been proposed. Such screw-type caps typically have a dual structure having an inner lid and an outer lid that are combined to be relatively rotatable.

For example, in Patent Document 1, in a double-structured cap in which an outer lid is attached to a cap body, a plurality of ratchet pawls are provided on the cap body at intervals in the circumferential direction, and the ratchet pawls are provided on the inner surface of the outer lid. A structure is disclosed in which a ratchet piece corresponding to the pawl is provided.

According to Patent Document 1, which discloses the structure, when resealing the cap, the ratchet pawl and the ratchet piece rotate idly and the rotation of the cap body is prevented when more torque than necessary is applied. mentioned.

On the other hand, as a structure that achieves a constant tightening torque when resealing the cap, for example, a double-structured cap disclosed in Patent Document 2 is also known. According to Patent Document 2, when resealing, the outer cap spins idly, the protrusion of the outer cap rides over the claw of the inner cap, and then the claw returns elastically, producing a click sound. is disclosed.

Patent No. 4500557 Japanese Patent Application Publication No. 2011-1080

As mentioned above, caps that can seal containers can be applied to a variety of contents due to their excellent convenience. Sex is also required.
The use of the caps shown in Patent Document 1 and Patent Document 2 mentioned above is certainly useful in that a constant tightening torque can be ensured.

However, in the past, there was no clear indicator for determining whether sealing was complete when resealing (closing) a cap, and it was left up to the subjective opinion of the individual user, or as described in Patent Documents 1 and 2 above, The upper limit of the tightening torque was simply determined by the timing.

For this reason, for example, in the former case, it is assumed that some users may close the cap without tightening it sufficiently due to differences in body size or age, which may cause the contents inside the container to leak. There are undeniable concerns.

On the other hand, in the latter case, completion of closure is notified by the above-mentioned click sound, but the above-mentioned patent documents do not give any deep consideration to the relationship between tightening torque and notification sound. It is difficult to manufacture products with sufficient design freedom for both torque and noise. For example, if you try to vary the notification sound or adjust the volume of the notification sound, the magnitude of the tightening torque will change with this adjustment, resulting in the generation of an excessive tightening torque, although it is constant. I have issues.

As described above, there is still room for improvement in the conventional technology including the above-mentioned patent documents, and therefore, as an example of the purpose of the present invention, it is possible to present a clear indicator of closure completion without relying on the subjectivity of the individual user. One example of this is to provide a cap with a unique structure.

In order to solve the above problems, a synthetic resin cap in one embodiment of the present invention includes (1) an inner lid that has a top wall and a side wall that hangs down from the top wall and is threadedly engaged with the container mouth; A synthetic resin cap including an outer cover having a skirt wall hanging down from a top wall and covering the outer surface of the inner cover into which the inner cover is fitted, the outer cover having an outer surface and an inner surface of the outer cover. a cap opening mechanism that is provided between the container opening and opens the cap to the container mouth; and a cap opening mechanism that is provided between the skirt wall of the outer lid and the side wall of the inner lid, and that is provided between the inner surface of the skirt wall and the inner lid. A cam having a columnar projection provided on one side of the outer surface of the side wall of the inner cover, and a guide groove provided on the other side of the inner surface of the skirt wall and the outer surface of the side wall of the inner cover to restrict movement of the columnar projection. a closure mechanism configured to close the container opening; a first rib provided on one of the inner surface of the top wall and the outer surface of the top wall; a first elastic piece provided on the other of the inner surface of the top wall and the outer surface of the top wall, and starts generating a sound indicating completion of capping after the container opening is sealed with the inner lid by the capping mechanism. a sound generation control mechanism for controlling the sound generation, wherein the first rib and the first elastic piece provided on the inner surface of the outer lid and the outer surface of the inner lid work together to generate sound when the bottle is closed ; The mechanism is located radially inner than the cam mechanism and the cap opening mechanism, and the guide groove includes a vertical groove portion in which the columnar projection is guided when fitting the inner lid to the outer lid, and a vertical groove portion in which the columnar projection is guided when fitting the inner lid to the outer lid. a first guide groove formed continuously with the groove, and a second guide groove in which the columnar protrusion is further guided after being guided to the first guide groove; Until the sealing is completed, the columnar protrusion is located inside the first guide groove section, so that the outer cover and the inner cover can rotate together as one, and after the sealing is completed, the columnar protrusion is located inside the first guide groove. It is characterized in that the outer cover is movable in the circumferential direction within the second guide groove so that the outer cover can rotate relative to the inner cover .

Further, in the synthetic resin cap described in (1) above, ( 2 ) the first elastic piece is erected with the top wall of the inner lid as the base end, and extends from the inner lid on the downstream side in the closing direction. The first rib extends in the circumferential direction on the inner surface of the top wall of the outer lid, and the first rib extends toward the downstream side in the closing direction. is formed so that its height from the inner surface gradually increases, and contacts the tip of the first elastic piece to bend the first elastic piece, after the container opening is sealed with the inner lid in the capping step. It is preferable that the end of the first elastic piece is arranged so as to elastically ride over the first rib and generate sound.

In the synthetic resin cap described in ( 2 ) above, ( 3 ) the first elastic piece extends at a plurality of different diameters from the center on the outer surface of the top wall of the inner lid, and extends in each circumferential direction. It is preferable that a plurality of ribs be provided intermittently along the cap, and arranged so that when the ribs elastically ride on the first rib during closure, the timings at which they ride on the first ribs do not overlap in the circumferential direction.

Furthermore, in the synthetic resin cap according to any one of ( 1 ) to (3) above, ( 4 ) the outer cover is further provided between the first guide groove portion and the second guide groove portion with respect to the inner cover. It is preferable that a third guide groove portion for bringing the two parts closer together is provided.

Further, in the synthetic resin cap according to any one of ( 1 ) to (4) above, ( 5 ) the closure mechanism includes a flexible first elastic member erected on the top wall of the inner lid in the closure process. The columnar protrusion may be arranged at a position where the columnar projection passes over the first guide groove before the sound is generated when the end of the piece passes over the first rib formed on the inner surface of the top wall of the outer lid. preferable.

Furthermore, in the synthetic resin cap according to any one of (1) to ( 5 ) above, ( 9 ) the opening mechanism is erected with the outer surface of the top surface of the inner lid as the base end, and a flexible second elastic piece whose distal end extends in the circumferential direction so that the height from the outer surface on the downstream side is higher than the base end; , a second rib provided so that the height from the inner surface of the top wall gradually increases toward the downstream side in the closing direction, and with which an end of the second elastic piece engages when opening the cap. It is preferable that

In the synthetic resin cap described in ( 6 ) above, ( 7 ) the second elastic piece and the second rib are connected to the flexible first elastic piece standing upright on the top wall of the inner lid and the second elastic piece and the second rib. It is preferable that the first rib is disposed radially outward from the first rib formed on the inner surface of the top wall of the outer lid.

In the synthetic resin cap described in ( 6 ) or (7) above, ( 8 ) the height of the second elastic piece from the outer surface of the inner cover is equal to the outer surface of the inner cover of the first elastic piece. It is preferable that the height is higher than the height from .

According to the present invention, the closure mechanism can realize a reliable closure operation without relying on the subjectivity of the individual user, and furthermore, the sound control mechanism notifies the completion of closure after sealing, so that the closure is properly sealed. It also becomes possible to realize gender.

FIG. 2 is a cross-sectional view schematically showing a state in which a synthetic resin cap 100 according to an embodiment is attached to a container mouth portion 1a. FIG. 2 is an external perspective view of an inner lid 10 constituting a synthetic resin cap 100. FIG. FIG. 3 is a top view and a side view of the inner lid 10. FIG. FIG. 1 is a schematic diagram illustrating a portion of the guide groove 32 constituting the cam mechanism 30 in the inner lid 10, and a cross-sectional view schematically showing the internal structure of the inner lid 10. FIG. FIG. 2 is an external perspective view of an outer lid 20 that constitutes a synthetic resin cap 100. FIG. 2 is a bottom view of the inside of the outer lid 20 as seen from the bottom side, and a sectional view thereof taken along line AA. FIG. 2 is a top view of the outer lid 20, and a diagram schematically showing the side surface and internal structure. FIG. 3 is a state transition diagram (part 1) when the inner lid 10 is attached to the outer lid 20. FIG. FIG. 2 is a state transition diagram (part 2) when the inner cover 10 is attached to the outer cover 20. FIG.

Embodiments for suitably implementing the present invention will be described below.
In this embodiment, for convenience of explanation, the X, Y, and Z directions are appropriately set in the explanation using the drawings, but this is for convenience of explanation and does not limit the present invention excessively.

≪Synthetic resin cap 100≫
The structure of the synthetic resin cap 100 according to this embodiment will be described with reference to FIGS. 1 to 7. As is clear from these figures, the synthetic resin cap 100 has an inner lid 10 (described later) attached to the container opening 1a, and is used to store and preserve various contents such as well-known drinking water in the container. It is suitable. Although there are no particular restrictions on the material of the synthetic resin cap 100, it is preferably made of a known synthetic resin (eg, polyethylene, polypropylene, etc.) that can be injection molded.

Further, as is clear from FIGS. 1 and 4(b), the container opening 1a of the container suitable for this embodiment has a threaded portion 16b formed on the inner surface 12b of the side wall 12 of the inner lid 10, which will be described later. A threaded portion 1b that can be fitted is formed. Note that, like the materials described above, there is no particular restriction on the shape of the container, and various known shapes may be applied.

As shown in FIG. 1, the synthetic resin cap 100 according to the present embodiment includes an inner lid 10 having a top wall 11 and a side wall 12 hanging down from the top wall 11 and screwed into the container opening 1a, and a top wall 21. It is configured to include an outer cover 20 having a skirt wall 22 hanging down from the top wall 21 and covering the outer surface of the inner cover 10 into which the inner cover 10 is fitted. As shown in FIG. 1, the inner lid 10 may have a packing 15, and in this embodiment, the inner lid 10 is fitted to the container opening 1a through the packing 15, thereby improving the sealing performance. It is secured.

The structure of the inner lid 10 and outer lid 20 of the synthetic resin cap 100 will be described in detail below, using FIGS. 2 to 7 as appropriate.
<Inner lid 10>
First, the inner lid 10 of this embodiment will be explained using FIGS. 1 to 4.
As is clear from these figures, the inner lid 10 includes a top wall 11 and a side wall 12 that hangs down from the periphery of the top wall 11. Among these, on the outer surface 11a of the top wall 11, a plurality of first elastic pieces 13 and a plurality of second elastic pieces 14 are provided. Further, the inner surface of the top wall 11 is provided with a packing 15 for sealing the container opening 1a.

The first elastic piece 13 is erected with the top wall 11 of the inner lid 10 as the base end 13a, and the height from the inner lid 10 on the downstream side in the closure direction (clockwise (+θz) direction in FIG. 3) is based on the base end 13a. The tip 13b is formed to extend in the circumferential direction so as to be higher than the end 13a. The first elastic piece 13 is configured to have enough flexibility to overcome the first rib, as will be described later.

Further, as is clear from FIGS. 2 and 3, the first elastic pieces 13 in this embodiment are arranged at different diameters (r1, r2, r3) from the center O on the outer surface 11a of the top wall 11 of the inner lid 10. Extending. Furthermore, in this embodiment, a plurality of elastic pieces 13 extending for each of the plurality of diameters are provided intermittently along the respective circumferential directions. As shown in the figure, when the first elastic pieces 13 elastically ride on the first rib 23 during closure, the timings at which the first elastic pieces 13 ride on the first ribs 23 are arranged so that they do not overlap in the circumferential direction.

In this embodiment, as shown in FIG. 3, the first elastic pieces 13 are arranged at three different diameters from the center; however, the first elastic pieces 13 are not limited to this configuration, and may be arranged at two or more different diameters, for example. Good too. Furthermore, in this embodiment, the four first elastic pieces 13 are arranged intermittently along the circumferential direction, but the arrangement is not limited to this, and any number of pieces such as two, three, or five or more may be arranged.
Further, although the same number of first elastic pieces 13 (four in this example) are arranged for each diameter, for example, a different number of first elastic pieces 13 may be arranged along the circumferential direction for each of a plurality of diameters. Good too.

Like the first elastic piece 13, the second elastic piece 14 is erected with the outer surface 11a of the top surface 11 of the inner lid 10 as the base end 14a, and has a height from the outer surface 11a on the downstream side in the closure direction. The distal end 14b is formed to extend in the circumferential direction so that it is higher than the base end 14a. The second elastic piece 14 is configured to have enough flexibility to overcome a second rib, which will be described later.

As is clear from FIG. 3 and the like, it is preferable that the second elastic piece 14 of this embodiment is disposed on the outer side in the radial direction than the first elastic piece 13 described above.
Furthermore, it is desirable that the height of the second elastic piece 14 of this embodiment from the outer surface 11a with which the base end 14a contacts is higher than the height of the first elastic piece 13 from the outer surface 11a. This allows the sound generation control mechanism (described later) to notify completion of the closure after the closure operation is completed.

On the other hand, a guide groove 32 is formed on the outer surface 12a of the side wall 12 of the inner lid 10 to restrict movement of a columnar projection 31 (described later) that extends in the circumferential direction and is provided on the outer lid 20. This guide groove 32 functions as a part of the cam mechanism 30 in this embodiment together with the columnar projection 31 described above.
In this embodiment, the guide groove 32 is formed on the inner lid 10 side, and the columnar protrusion 31 is formed on the outer lid 20 side, but these may have the opposite configuration. That is, the columnar projections 31 may be formed on the inner lid 10 side, and the guide grooves 32 may be formed on the outer lid 20 side.

Next, the structure of the guide groove 32 in this embodiment will be described in detail with reference to FIG. 3(b) and FIG. 4(a). As shown in these figures, the guide groove 32 is formed on the outer surface 12a of the side wall 12 of the inner lid 10, and includes at least a vertical groove part 32a, a first guide groove part 32b, and a second guide groove part 32c. . Further, as shown in the figure, the guide groove 32 is provided with a third guide groove 32d between the first guide groove 32b and the second guide groove 32c for bringing the outer cover 20 closer to the inner cover 10. It is desirable that

As shown in FIG. 3(b) and the like, the vertical groove portion 32a is a portion to which the columnar projection 31 is first guided when fitting the outer cover 20 to the inner cover 10. The vertical groove 32a is formed in the outer surface 12a so as to be parallel to the axial direction (Z direction) of the inner lid 10. Further, there are no particular limitations on the width or axial length of the vertical groove portion 32a, as long as the columnar projection 31 can be inserted smoothly without any unintentional wobbling.

The first guide groove portion 32b is formed continuously with the above-described vertical groove portion 32a, and is engaged with the columnar projection 31 after starting the closing operation of the container mouth portion 1a, thereby integrating the outer lid 20 and the inner lid 10. It has the ability to rotate. In other words, when the columnar projection 31 of the outer cover 20 is engaged with the first guide groove 32b, the outer cover 20 and the inner cover 10 are rotatable as one unit.

As shown in FIG. 4(a), the first guide groove 32b has a horizontal portion extending a predetermined length in the horizontal direction (θz direction) from the lower end of the vertical groove portion 32a, and an axis extending from the end of this horizontal portion. It is composed of a curved surface portion that is curved downward in the direction (Z direction). The curvature and size of the curved surface of the first guiding groove 32b are determined after the inner lid 10 seals the container opening 1a in the process of closing the container, that is, after the frictional force in the circumferential direction of the container opening 1a is applied to the inner lid. The adjustment is made to such an extent that the outer cover 20 can rotate relative to the inner cover 10 when the frictional force in the circumferential direction between the outer cover 10 and the outer cover 20 is exceeded.

Until the inner lid 10 can be tightened against the container opening 1a (that is, before sealing is completed), the force of the columnar protrusion 31 is greater than the force of the second elastic piece 14 to overcome the second rib 24, which will be described later. The force that remains in the first guide groove 32b is greater, and in this state, the inner cover 10 and the outer cover 20 rotate as one.
On the other hand, when the sealing is completed and the rotation of the inner lid 10 relative to the container mouth 1a stops, the outer lid 20 further rotates relative to the inner lid 10, and as a result, in this embodiment, the columnar protrusion 31 is guided to the third guide groove 32d over the first guide groove 32b.

The third guide groove 32d is a groove in which the columnar projection 31 is guided by climbing over the first guide groove 32b downward (towards the lower end in the -Z direction) when the above-described closure operation is continued. The third guide groove 32d is provided so that the columnar projection 31 can be positioned lower in the axial direction than a second guide groove 32c, which will be described later. Note that this third guide groove 32d is not essential and may be omitted as appropriate.

When the columnar projection 31 is guided into the third guide groove 32d, the second elastic piece 14, which will be described later, is pressed against the top wall 21 of the outer lid 20, and the second elastic piece 14 is compressed in the axial direction. When the second elastic piece 14 is compressed in the axial direction in this way, the packing 15 more firmly seals the container opening 1a, and the resistance of the second elastic piece 14 with the outer lid 20 increases. As a result, the user can feel that the cap is closed due to the change in the closure torque.

The second guide groove portion 32c is a groove into which the columnar projection 31 is guided after it has climbed over the third guide groove portion 32d when the above-described closure operation is continued. As shown in FIG. 4(a), one end of the second guide groove 32c is continuous with the third guide groove 32d, and the other end is continuous with the vertical groove 32a described above. .
When the columnar projection 31 is in the second guide groove 32c, the container opening 1a is sealed by the closure operation, and the columnar projection 31 is moved in the horizontal direction (-Y direction) in the second guide groove 32c. The outer cover 20 is rotatable relative to the inner cover 10.

<Outer lid 20>
Next, the outer lid 20 of this embodiment will be explained using FIGS. 5 to 7.
The outer cover 20 has a function of covering the outer surface of the inner cover 10 and fitting the inner cover 10 therein, and includes a top wall 21 and a skirt wall 22 that hangs down from the periphery of the top wall 21. Among these, the inner surface 21a of the top wall 21 is provided with a plurality of first ribs 23 and a plurality of second ribs 24, as shown in FIG. 5 and the like.

The first rib 23 extends in the circumferential direction on the inner surface 21a of the top wall 21 of the outer lid 20, and increases in height from the inner surface 21a toward the downstream side in the closure direction (+θz direction counterclockwise in FIG. 5). It is formed to gradually rise in height. That is, as shown in FIG. 5, each of the plurality of first ribs 23 has an inclined surface on the inner surface 21a such that the height from the inner surface 21a gradually increases from the base end 23a toward the distal end 23b. A plurality of them are provided intermittently along the circumferential direction. The first rib 23 has a function of coming into contact with the tip 13b of the first elastic piece 13 described above and bending the first elastic piece.

Further, the first rib 23 of this embodiment has a shape that also extends in the radial direction so as to correspond to the plurality of first elastic pieces 13 provided for a plurality of different diameters in the radial direction. In other words, the first rib 23 is arranged so as to extend in the radial direction so that the plurality of first elastic pieces 13 at different positions in the radial direction can respectively come into contact with each other.

In this embodiment, the two first ribs 23 are arranged intermittently along the circumferential direction as shown in FIG. Good too. Furthermore, the first ribs 23 may be divided and arranged in the radial direction so as to individually correspond to the plurality of first elastic pieces 13 that are located at different positions in the radial direction.
Further, the number of first ribs 23 arranged in the circumferential direction is smaller than the number of first elastic pieces 13 arranged (in this embodiment, four first elastic pieces 13 are arranged in the circumferential direction; Although two ribs 23 are arranged in the circumferential direction, the number of ribs 23 may be the same or the relationship may be reversed.

Like the first rib 23 described above, the second rib 24 extends in the circumferential direction on the inner surface 21a of the top wall 21 of the outer lid 20, and extends from the inner surface 21a of the top wall 21 toward the downstream side in the closure direction. The height is gradually increased.
The second rib 24 of this embodiment is arranged radially outward from the first rib 23 described above, and is located at the end (including the tip 14b) of the second elastic piece 14 when opening the cap. part) has the function of engaging.

Note that the first rib 23 and the second rib 24 described above are desirably formed integrally by injection molding or the like when manufacturing the outer lid 20, for example.
Further, as shown in FIG. 6 etc., in this embodiment, four second ribs 24 are arranged intermittently along the circumferential direction, but the arrangement is not limited to this form, and any number other than four may be arranged. . Further, the number of second ribs 24 arranged in the circumferential direction is smaller than the number of second elastic pieces 23 arranged (in this embodiment, eight second elastic pieces 14 are arranged in the circumferential direction, Although four ribs 24 are arranged in the circumferential direction, the number of ribs 24 may be the same or the relationship may be reversed.

On the other hand, as shown in FIGS. 5 and 6(b), two columnar projections 31 are formed on the inner surface 22a of the skirt wall 22 so as to face each other. As described above, this columnar projection 31 functions as a part of the cam mechanism 30 in this embodiment together with the above-mentioned guide groove 32. In this embodiment, two cam mechanisms 30 consisting of columnar protrusions 31 and guide grooves 32 are provided in the circumferential direction, but the configuration is not limited to this, and it is preferable to have a plurality of cam mechanisms 30, thereby keeping the outer cover 20 horizontal. , the opening/closing valve can be rotated smoothly.

Further, as shown in FIG. 6(b), an undercut 25 is formed below the columnar projection 31 on the inner surface 22a of the skirt wall 22. When the outer cover 20 is fitted to the inner cover 10, this undercut 25 fits with the circumferential convex portion 17 (see FIG. 1, etc.) of the inner cover 10, so that the outer cover 20 unintentionally fits into the inner cover 10. This prevents separation from the
Note that as shown in FIG. 7, the outer surface 22b of the skirt wall 22 of the outer lid 20 may have an uneven structure such as known knurling. This prevents the outer lid 20 from slipping when pinched.

<Opening mechanism OM, closing mechanism CM, and sound control mechanism SCM>
Next, a description will be given of the cap opening mechanism OM, cap closure mechanism CM, and sound generation control mechanism SCM, which are operated by the respective components of the inner lid 10 and the outer lid 20.
First, the synthetic resin cap 100 of this embodiment includes an opening mechanism OM that is provided between the outer surface of the inner lid 10 and the inner surface of the outer lid 20 and opens the container opening 1a to the container opening 1a. The container is provided with a capping mechanism CM that caps the container, and a sounding control mechanism SCM that starts producing a sound indicating completion of capping after the container opening 1a is sealed with the inner lid 10 by the capping mechanism CM.

Of these, the cap opening mechanism OM includes a second elastic piece 14 of the inner lid 10 and a second rib 24 of the outer lid 20. Note that the first elastic piece 13 of the inner lid 10 and the first rib 23 of the outer lid 20 may also contribute to the opening operation, so they may be included in the opening mechanism OM.
More specifically, when removing the synthetic resin cap 100 from the container opening 1a, pinch the outer surface 22b of the outer cover 20 and turn the outer cover 20 in the closing direction (clockwise in this example). The tip 24b of the second rib 24 is caught on the tip 14b of the second elastic piece 14, thereby making it possible to ensure sufficient opening torque.

The closure mechanism CM is provided between the skirt wall 22 of the outer lid 20 and the side wall 12 of the inner lid 10, and rotates the inner lid 10 and the outer lid 20 together until sealing is completed in each closure process. The device includes a cam mechanism 30 that rotates only the outer lid 20 in the closing direction after sealing is completed.

Further, in view of FIGS. 3 and 5 collectively, the capping mechanism CM of the present embodiment allows the cam to close before the sound is generated when the tip 13b of the first elastic piece 13 climbs over the first rib 23 in the capping process. It is preferable that the columnar protrusion 31 be arranged at a position where it can overcome the first guide groove 32b in the mechanism 30. This allows the sound generation control mechanism SCM to notify completion of capping after sealing is completed.

The sound generation control mechanism SCM is disposed on the outer surface 11a of the top wall 11 of the inner lid 10 and the inner surface 21a of the top wall 21 of the outer lid 20. This sound generation control mechanism SCM is disposed radially inwardly than the above-described capping mechanism CM and capping mechanism OM, and the contact members of the inner surface of the outer lid 20 and the outer surface of the inner lid 10 cooperate with each other when closing the cap. It has the function of pronouncing by

More specifically, the sound generation control mechanism SCM of this embodiment is configured to include the above-described first elastic piece 13 and the first rib 23 as the above-described contact member. Further, in this sound generation control mechanism SCM, after the container opening 1a is sealed with the inner lid 10 in the capping process, the end portion of the first elastic piece 13 elastically overcomes the first rib 23 so that the sound is generated. It is configured.

<State transition during closure operation in synthetic resin cap 100>
Next, with reference to FIGS. 8 and 9, the state transition during the closure operation of the synthetic resin cap 100 of this embodiment will be described.

First, when closing the container opening 1a using the synthetic resin cap 100 of this embodiment, the outer cover 20 is fitted to the inner cover 10, as shown in FIG. 8(1). In this state, the columnar protrusion 31 of the cam mechanism 30 is in the vertical groove part 32a of the guide groove 32, and the undercut 25 of the outer cover 20 fits into the circumferential protrusion 17 (see FIG. 1 etc.) of the inner cover 10. This prevents the outer lid 20 from unintentionally separating from the inner lid 10.

At this time, the second elastic piece 14 erected on the top wall 11 of the inner lid 10 is slightly compressed by the top plate 21 of the outer lid 20. Therefore, when the user further pinches the outer surface 22b of the outer cover 20 and rotates the outer cover 20 in the closing direction (clockwise in this example), the resistance when the second elastic piece 14 is compressed by the outer cover 20 , the inner lid 10 also rotates in the closing direction together with the outer lid 20.

Next, when the user further rotates the outer lid 20 in the closing direction, as shown in FIG. 8(2),
The threaded portion 16b of the inner lid 10 gradually becomes more tightly engaged with the threaded portion 1b of the container opening 1a, and it becomes difficult for the inner lid 10 to rotate in the closing direction. Then, the outer cover 20 rotates relative to the inner cover 10, thereby guiding the columnar projection 31 from the vertical groove portion 32a to the first guide groove 32b. As a result, both the inner lid 10 and the outer lid 20 rotate in the closing direction due to the force of the columnar projection 31 hitting the first guide groove 32b, and when the closing operation is continued, the packing 15 seals the container opening 1a, and the packing 15 closes. Since the compressing force is applied to the inner lid 10, the inner lid 10 does not rotate and only the outer lid 20 begins to rotate in the closing direction.

Note that in the states shown in FIGS. 8(1) and 8(2) above, the second elastic piece 14 is not yet in a positional relationship in which it contacts the second rib 24 in the circumferential direction (as shown in FIGS. 2 and 3). (Please refer to the positional relationship between the tip 14b of the second elastic piece 14 and the guide groove 32) and the first elastic piece 13 have a height relationship in which they contact the first rib 23 in the axial direction (Z direction). do not have. That is, in each state shown in FIGS. 8(1) and (2), neither the first elastic piece 13 nor the second elastic piece 14 is in a position to flip the corresponding first rib 3 or second rib 24. , the notification sound due to these collaborations has not yet been generated.

Next, as shown in FIG. 9(1), when the columnar protrusion 31 reaches the third guide groove 32d by turning the outer cover 20 in the closing direction, the distance in the axial direction of the outer cover 20 with respect to the inner cover 10 increases. By contracting, the first rib 23 is lowered to a position where the first elastic piece 13 flips it. When the outer lid 20 is further turned in the closing direction after this state, each first elastic piece 13 flicks the corresponding first rib 23, and a notification sound indicating completion of closing starts to be generated.

Thereafter, as shown in FIG. 9(2), when the user further turns the outer lid 20 in the closing direction, the columnar projection 31 is guided from the third guide groove 32d to the second guide groove 32c. As is clear from the figure, the columnar projection 31 is returned to a higher position in the axial direction by being located in the second guide groove 32c, so even if the outer lid 20 is continued to be turned in the closing direction, the second elastic piece The amount of compression of No. 14 remains almost unchanged (it weakens slightly, but does not become stronger).

Therefore, the closing torque for tightening the outer cover 20 in the closing direction is not increased, and the outer cover 20 rotates idly with respect to the inner cover 10. At this time, the first elastic piece 13 remains in the position where it flips the first rib 23, so the notification sound indicating the completion of closure continues to sound while the first elastic piece 13 is rotating idly.
On the other hand, when removing the synthetic resin cap 100 from the container opening 1a to open the container, the user rotates the outer lid 20 in the opening direction (counterclockwise in this example) so that the tip 14b of the second elastic piece 14 By being caught on the second rib 24, the inner lid 10 is rotated to perform an opening operation.

According to the synthetic resin cap 100 of this embodiment described above, a reliable closure operation can be realized by the closure mechanism CM without depending on the subjectivity of the individual user. Furthermore, since the sound control mechanism SCM emits a notification sound indicating the completion of capping after sealing, it is possible to achieve a perfect seal for the mouth of the container.

Note that the embodiment described above is an example, and various modifications can be made without departing from the spirit of the present application.
For example, the first elastic piece 13 is preferably formed integrally with the inner lid 10 and is made of the same synthetic resin as the inner lid 10. However, the first elastic piece 13 is not necessarily formed integrally with the inner cover 10 by injection molding, and the first elastic piece 13 may be attached to the outer surface 11a of the top wall 11 separately from the inner cover 10. It's okay.
Further, in this embodiment, the first elastic piece 13 is formed on the inner lid 10, and the first rib 23, which will be described later, is formed on the outer lid 20. However, the present invention is not limited to this form, and a reverse arrangement may be adopted in which the first elastic piece 13 is formed on the outer cover 20 and the first rib 23 is formed on the inner cover 10. Further, the second elastic piece 14 and the second rib 24 are not limited to the above-described form, but may be reversed such that the second elastic piece 14 is formed on the outer cover 20 and the second rib 24 is formed on the inner cover 10. It may also be an arrangement configuration. Alternatively, the first elastic piece 13 and the second rib 24 may be formed on the inner lid 10, and the first rib 23 and the second elastic piece 14 may be formed on the outer lid 20, etc., between the pair of the elastic piece and the rib. They may also be arranged in such a way that they intersect with each other.
Further, a new synthetic resin cap may be constructed by appropriately combining elements of the above-described embodiments and modified examples.

INDUSTRIAL APPLICABILITY The present invention is suitable for providing a cap that can ensure reliable closing operation and perfect sealing performance without depending on the subjectivity of the individual user.

1a: Container opening 10: Inner lid 11: Top wall 12: Side wall 13: First elastic piece 14: Second elastic piece 15: Packing 16: Threaded part 17: Circumferential convex part 20: Outer lid 21: Top wall 22 : Skirt wall 23: First rib 24: Second rib 25: Undercut 30: Cam mechanism 31: Columnar projection 32: Guide groove 100: Synthetic resin cap CM: Closing mechanism OM: Opening mechanism SCM: Sound control mechanism

Claims (8)

an inner lid having a top wall and a side wall hanging down from the top wall and screwed together with the container mouth; a top wall and a skirt wall hanging down from the top wall and covering the outer surface of the inner lid; An outer lid into which the synthetic resin cap is fitted,
a cap opening mechanism provided between the outer surface of the inner lid and the inner surface of the outer lid to open the container opening;
a columnar projection provided between the skirt wall of the outer lid and the side wall of the inner lid, and provided on one of the inner surface of the skirt wall and the outer surface of the side wall of the inner lid; a capping mechanism configured with a cam mechanism and having a guide groove provided on the other side of the side wall of the inner lid to restrict movement of the columnar protrusion to close the container mouth;
a first rib provided on one of the inner surface of the top wall and the outer surface of the top wall; and a first elastic rib provided on the other of the inner surface of the top wall and the outer surface of the top wall while facing the first rib. a sound control mechanism that starts a sound indicating completion of capping after the container opening is sealed with the inner lid by the capping mechanism;
The first rib and the first elastic piece provided on the inner surface of the outer lid and the outer surface of the inner lid work together when closing the cap, so that a sound is generated;
The sound generation control mechanism is located radially inner than the cam mechanism and the cap opening mechanism,
The guide groove includes a vertical groove portion into which the columnar protrusion is guided when fitting the inner cover to the outer cover, a first guide groove portion formed continuously with the longitudinal groove portion, and a first guide groove portion in which the columnar protrusion guides the columnar protrusion. a second guide groove portion that is further guided after being guided to the first guide groove portion;
Until sealing of the container opening is completed by the inner lid, the columnar protrusion is located inside the first guide groove, and the outer lid and the inner lid can rotate together as one, and the sealing is completed. The synthetic resin cap is characterized in that the columnar protrusion moves in the circumferential direction within the second guiding groove, so that the outer cover can rotate relative to the inner cover. The first elastic piece is erected with the top wall of the inner lid as the base end, and has a tip extending in the circumferential direction so that the height from the inner lid on the downstream side in the closure direction is higher than the base end. Extends,
The first rib extends in the circumferential direction on the inner surface of the top wall of the outer lid, and is formed so that the height from the inner surface gradually increases toward the downstream side in the closure direction, and the first rib is formed so that the height from the inner surface increases gradually toward the downstream side in the closure direction. makes contact with the tip of the first elastic piece and deflects the first elastic piece;
2. The composition according to claim 1, wherein the end of the first elastic piece is arranged so as to elastically ride over the first rib and generate a sound after the container opening is sealed with the inner lid in the capping step. resin cap. The first elastic pieces extend from the center at a plurality of different diameters on the outer surface of the top wall of the inner lid, and are provided intermittently in a plurality along the circumferential direction of the inner lid, and are connected to the first rib when the lid is closed. 3. The synthetic resin cap according to claim 2 , wherein the synthetic resin cap is arranged so that the timings of the elastic riding do not overlap in the circumferential direction. According to any one of claims 1 to 3, a third guide groove is provided between the first guide groove and the second guide groove to bring the outer cover closer to the inner cover. Synthetic resin cap. The closure mechanism is such that during the closure process, an end of a flexible first elastic piece erected on the top wall of the inner lid climbs over a first rib formed on the inner surface of the top wall of the outer lid. The synthetic resin cap according to any one of claims 1 to 4, wherein the columnar protrusion is disposed at a position where the columnar protrusion passes over the first guide groove portion before sound generation. The opening mechanism is
A flexible cap is erected with the outer surface of the top wall of the inner lid as the base end, and has a distal end extending in the circumferential direction so that the height from the outer surface on the downstream side in the closure direction is higher than the base end. 2 elastic pieces;
It extends in the circumferential direction on the inner surface of the top wall of the outer lid, and is provided so that the height from the inner surface of the top wall gradually increases toward the downstream side in the closing direction, and when the cap is opened, the second elastic piece The synthetic resin cap according to any one of claims 1 to 5 , comprising a second rib whose end portion engages. The second elastic piece and the second rib are arranged in a radial direction relative to a flexible first elastic piece standing upright on the top wall of the inner lid and a first rib formed on the inner surface of the top wall of the outer lid. 7. The synthetic resin cap according to claim 6 , wherein the synthetic resin cap is arranged on the outside with respect to. 8. The synthetic resin cap according to claim 6 , wherein the height of the second elastic piece from the outer surface of the inner lid is higher than the height of the first elastic piece from the outer surface of the inner lid.