JP7456161B2 - cap - Google Patents

Description

The present invention relates to a cap that is screwed onto a spout, which is the mouth of a container, to close the spout, and particularly to a cap equipped with a tamper-evident band.

Conventionally, the mouth of beverage containers, such as PET bottles, has been fitted with a cap that has a function to prevent unauthorized opening by tampering, etc., and the most commonly used caps consist of a cap body with an internal thread that screws into the external thread of the mouth, and a ring-shaped tamper-proof band attached to the lower part of the peripheral wall of the cap body.

The tamper-evident band is provided with a plurality of locking pawls on the inside of the band that lock onto locking protrusions that protrude outward from a portion below the externally threaded portion of the opening. Each of them extends in the opening direction and can be deformed to lie down on the inner surface of the band. When the cap body is rotated in the closing direction, such as when it is first attached to the mouth of a beverage container, the tamper-evident band rotates in the closing direction together with the cap body, and the locking pawl passes over the locking protrusion on the mouth side. , and will not be locked against the locking protrusion.

When the screwed-on cap is rotated in the opening direction, the tamper-proof band begins to rotate in the opening direction together with the cap body, but the locking claw on the band side locks with the locking protrusion on the mouth side, preventing unauthorized access. Rotation of the tamper-proofing band itself in the opening direction is restricted.

When the cap body rotates in the opening direction and rises, the connecting part connecting the tamper-evident band, whose rotation in the opening direction is restricted, and the cap body is separated, and the tamper-evident band is attached to the opening side. The system was to remain.

Then, when the cap body is screwed back onto the mouth portion again, the gap between the cap body and the tamper-evident band opens, and it becomes possible to visually confirm that the cap body has been opened. Furthermore, by understanding that even if the cap body is returned to the mouth, the gap between the cap body and the tamper-evident band will open, it is effective in deterring unauthorized tampering. .

BACKGROUND ART Many containers for storing beverages, jelly beverages, etc. are in circulation that use a spout as the opening of the container, which has a small diameter and allows the beverage or jelly beverage to be drunk by directly touching the spout. There are also types of caps that are attached to spouts with small mouth diameters that are equipped with the above-mentioned tamper-evident band, but if the tamper-evident band remains on the spout side when the cap is opened, the tamper-evident band may be swallowed accidentally. there's a possibility that.

As shown in Patent Documents 1 and 2, the tamper-evident band has a configuration in which it is divided into two parts in advance, and between each of the adjacent divided bands, a pair of upper and lower breakable bridges is provided. Adjacent divided band parts are connected via the two upper and lower bridges, so that the bridges are broken during the opening operation, and the divided band parts connect the connecting parts. A device has been proposed in which the cap can be removed from the spout together with the cap body, which is continuous with the cap interposed therebetween.

Japanese Patent Application Publication No. 2013-103721 JP2015-217966A

However, for container-shaped products in which a cap configured as shown in Patent Documents 1 and 2 is attached to a spout with a small diameter, not all bridges may break even if a consumer turns the cap when opening the package. There wasn't. Since not all bridges necessarily break, when a cap with an unbroken bridge is returned to the spout and closed, and the cap is closed, the unsealing operation has already been performed. It was difficult to determine whether or not the cap was the same.

For example, even if a product is opened for the purpose of playing a trick, a foreign object is inserted into the container body through the spout, and the container is closed again with a cap, the consumer attempting to purchase the product may find that the product has already been opened. It is difficult to tell whether this is true or not.

On the other hand, when manufacturing a product, when first attaching a cap to the threaded portion of a spout, that is, when capping, the cap is rotated in the closing direction and screwed onto the spout. At this time, the locking pawl on the inside of the tamper-evident band moves over the locking protrusion of the spout, pulling along the circumferential direction of the tamper-evident band and vertically (in the cap height direction). Alongside shear will be applied to the bridge, but these forces must not cause the bridge to fail. Therefore, it is important to ensure that the bridges do not break during capping during product manufacture, and that all the bridges break when a consumer who has purchased the product opens the cap.

However, in current caps, emphasis is placed on preventing the bridge from breaking during capping, and many are manufactured with an excessively large cross-sectional area of the bridge. Therefore, as mentioned above, there is a problem in that not all bridges are broken when the package is opened.

Therefore, in view of the above circumstances, the present invention is designed so that the bridges of the tamper-evident band do not break during capping, and all the bridges break when the cap is turned in the opening direction in a normal opening operation. The objective is to obtain a cap that can be easily determined by visual inspection from the condition between adjacent split bands because the bridge has already been broken, even if the cap is reattached to the spout by mischief after being opened. The purpose is to

(Invention of Claim 1)
The present invention has been made in consideration of the above-mentioned problems, and includes a cap body that is screwed and attached to a spout, and a tamper-evident band that is located at the bottom of the cap body via a connecting part. , the tamper-evident band consists of four split bands and four breakable bridges connecting the adjacent split bands, and the split band has a locking protrusion on the spout when rotated in the opening direction. A locking pawl is provided that locks and restricts rotation in the bottle opening direction, and when the locking nail locks on the locking protrusion and the rotation of the split band in the bottle opening direction is restricted. , a cap in which the bridge is broken,
The bridge has a height greater than a width of the bridge;
The divided bands and the bridges are arranged alternately in the circumferential direction of the tamper-evident band, and two of the bridges located between adjacent divided bands are arranged in a first position of the tamper-evident band. The remaining two bridges are arranged at opposing positions in a radial direction, and the remaining two bridges are arranged at opposing positions in a second radial direction different from the first radial direction,
The ratio of the height of the bridge to the bridge width of the two bridges arranged at opposite positions in the second radial direction, and the ratio of the bridge height to the bridge width of the two bridges arranged at opposite positions in the first radial direction. It is different from the ratio of the bridge height to the bridge width in the bridge,
The ratio of the height of the bridge to the width of the bridge in the bridges disposed at positions facing each other in the second radial direction is such that the ratio of the height of the bridge to the width of the bridges in the bridges located at positions facing each other in the first radial direction is The above problem is solved by providing a cap characterized in that the ratio of the height of the bridge to the width of the bridge is greater .

(Invention of Claim 2)
Another invention is provided with a cap body that is screwed and attached to the spout, and a tamper-proofing band that is located at the lower part of the cap body via a connecting part, and the tamper-proofing band consists of four split bands and four breakable bridges that connect the adjacent split bands, and the split bands have locking protrusions on the spout to open the cap when rotated in the opening direction. A locking claw is provided to restrict rotation in the opening direction, and when the locking claw locks with the locking protrusion and the rotation of the split band in the opening direction is restricted, the bridge is broken. A cap,
The bridge has a height greater than a width of the bridge;
The divided bands and the bridges are arranged alternately in the circumferential direction of the tamper-evident band, and two of the bridges located between adjacent divided bands are arranged in a first position of the tamper-evident band. The remaining two bridges are arranged at opposing positions in a radial direction, and the remaining two bridges are arranged at opposing positions in a second radial direction different from the first radial direction,
When the initial opening operation of turning the cap body attached to the spout in the opening direction is performed, the two bridges located at opposing positions in the second radial direction are broken, and the first radial direction is broken. This cap is characterized in that the two bridges disposed at opposing positions do not break at the same time, and this cap is provided to solve the above problem.

(Invention of Claim 3)
In the above invention , the four divided bands are two long divided bands and two short divided bands whose circumferential length is shorter than the long divided bands, and the long divided bands and the two short divided bands are shorter than the long divided bands. The short divided bands are alternately located in the band circumferential direction,
Each of the two bridges disposed at opposite positions in the second radial direction is connected to a downstream end of the short divided band in the opening direction and an upstream end of the long divided band in the opening direction. It is possible to be a bridge located between.

(Effects of the invention of claim 1)
When capping a container product in production, the cap is turned in the closing direction and screwed onto the threaded portion of the spout. As the cap rotates and descends, the locking claw on the inside of the split band moves in the closing direction, climbing over the locking protrusion on the spout while undergoing elastic deformation to lie against the inner surface of the split band.

A restoring force is generated in the locking pawl due to the elastic deformation when it passes over the locking protrusion, and the split band itself is urged radially outward of the tamper-evident band. This biasing causes a tensile force to be applied to the bridge located between adjacent split bands so as to cause the tamper evident band to expand in diameter.

In addition, when the locking pawl goes over the locking protrusion, resistance is generated to the movement of the locking pawl due to friction, etc., and in a split band where the locking pawl rests on the locking protrusion, it is difficult to move the locking pawl in the closing direction and in the height direction of the cap. It becomes difficult to move downward. That is, an upward force is also applied to the locking pawl as a reaction from the locking protrusion side, making it difficult for the split band to move downward, albeit for a short time.

However, it is not necessarily the case that the divided bands adjacent to the divided bands in which the locking claws are placed on the locking protrusions become difficult to move downward at the same time. When one of the divided bands moves down together with the cap body that descends while rotating for capping, the positions of the opposing ends of the adjacent divided bands shift in the vertical direction.

In particular, there is a locking pawl on the end side of the divided band that is downstream in the closing direction, and the locking pawl rides on the locking protrusion, and the end side of the divided band that is upstream in the closing direction is directly attached to the connecting part etc. When the cap body is connected to the cap body, the positions of the opposing ends of the adjacent split bands shift vertically, and a shearing force acts on the bridge located between them, and the above-mentioned tensile force is also applied. There is a possibility that it will break.

When capping is performed in this manner, the bridge located between adjacent split bands is subjected to a tensile force along the circumferential direction of the tamper-evident band (by urging the split bands radially outward). The resulting tensile force) and the shearing force along the longitudinal direction (cap height direction) of the tamper-evident band (the shearing force generated when the opposing ends of adjacent split bands are shifted in the vertical direction) are applied. .

In order to prevent the bridge from breaking against the tensile force along the circumferential direction and the shearing force along the longitudinal direction of the tamper-evident band during capping, it is possible to increase the cross-sectional area of the bridge. However, if the cross-sectional area of the bridge is increased, the bridge will not break during the opening operation as described above.

Therefore, according to the invention of claim 1, since the height of the bridge in the longitudinal direction of the tamper-evident band is made larger than the width of the bridge (thickness in the radial direction of the tamper-evident band), the cross section of the bridge is Since the shape is elongated, it is possible to resist the shearing force when the opposing ends of the dividing band tend to shift up and down without increasing the cross-sectional area of the bridge. In addition, with respect to the tensile force generated during capping, the cross-sectional area can be minimized to the extent necessary to withstand the tensile force, which simplifies the formation of the bridge.

In the tamper- evident band, the bridge is separated when the cap is opened by turning it in the opening direction. When the bridge breaks, for example, the part of the split band protrudes outward in the radial direction of the tamper-evident band, causing the ring shape of the tamper-evident band to become different from when it was unopened, or If the gap between the bands can be emphasized, it will be easier to visually confirm that the cap is closed after opening.

The tamper-evident band can be provided with a mechanism that pushes the split bands outward in the radial direction when the bridge breaks. However, by providing this mechanism to the tamper-evident band, there is a possibility that the adjacent split bands may shift vertically when capping as described above, causing the bridge close to the mechanism to break due to shear.

According to the present invention, two of the four bridges located between the split bands are arranged in positions facing each other in a first radial direction of the tamper evident band, and the remaining two bridges are arranged in positions facing each other in a second radial direction different from the first radial direction, and the ratio of the bridge height to the bridge width of the two bridges arranged in positions facing each other in the second radial direction is different from the ratio of the bridge height to the bridge width of the two bridges arranged in positions facing each other in the first radial direction, and the ratio of the bridge height to the bridge width of the two bridges arranged in positions facing each other in the second radial direction is greater than the ratio of the bridge height to the bridge width of the two bridges arranged in positions facing each other in the first radial direction.

In this way, the two bridges arranged in the second radially opposite position have a higher resistance to shear (shear during capping) than the two bridges arranged in the first radially opposite position. The drag force increases. Therefore, a mechanism for pushing the above-mentioned split band outward can be provided in a portion close to the bridge located at a position opposite to the second radial direction.

Therefore, by providing the above-mentioned mechanism, even if adjacent dividing bands shift vertically and shearing force tends to act on the bridge, it is possible to prevent the bridge from breaking due to shearing during capping. Therefore, the bridge is broken by a proper opening operation, and the above-mentioned mechanism is utilized to cause the tamper-evident band to become irregularly shaped or the split band to protrude outward. Therefore, it becomes easier to take measures to make it clear that an opening operation has been performed.

(Effect of the invention of claim 2 )
According to the invention of claim 2 , when an initial opening operation is performed in which the cap body attached to the spout is turned in the opening direction, the two bridges disposed at opposing positions in the second radial direction Since the rupture and the rupture in the two bridges arranged at positions facing each other in the first radial direction are made asynchronously, the force for dividing the bridges during the opening operation is distributed to the four bridges. Instead of focusing on bridges that will be separated first, they will also concentrate their power on bridges that will be separated later.

In this way, the force to separate the bridges is applied to two bridges at a time, so the resistance from the bridge side when separating is reduced, making it easier to turn the cap when opening. be.

FIG. 2 is an explanatory diagram showing a cap according to an embodiment of the present invention as viewed obliquely from above. It is an explanatory view showing an embodiment in a state seen from the side. It is an explanatory view showing an embodiment in a state seen from above. FIG. 2 is an explanatory diagram showing a cross section of the embodiment. FIG. 3 is an explanatory diagram showing the tamper-evident band in the embodiment as viewed from below. FIG. 2 is an explanatory diagram schematically showing, in cross section, an unopened state in which the cap is attached to the spout. FIG. 3 is an explanatory diagram showing the tamper-evident band in the embodiment as viewed from above. FIG. 2 is an explanatory diagram showing the tamper-evident band in the embodiment as viewed from the side. 4 is an explanatory diagram showing the cap body according to the embodiment as viewed from below. FIG. It is an explanatory view showing a tamper-evident band in an embodiment in a perspective state. FIG. 7 is an explanatory plan view schematically showing the positions of the locking claw of the tamper-evident band, the locking protrusion of the spout, and the spring member when the cap is unopened in the embodiment. FIG. 3 is an explanatory diagram schematically showing a spring member in the embodiment in the form of a vertical cross section. It is an explanatory view showing roughly a spring member in an embodiment in a plane. 13 is an explanatory diagram showing the position of the spring member in the radial direction of the band when no resistance is generated in the spring member and the position of the locking projection of the spout, with the cap body overlapping. FIG. It is an explanatory view showing a state where a long division band is pushed outward by a spring member in a plane. FIG. 2 is an explanatory diagram showing the bridge breakage evaluation results when the studied caps are closed and opened in Tables 1 and 2. FIG. 5 is an explanatory diagram showing the average, maximum, and minimum widths and heights of the bridges of the studied caps, and the average, maximum, and minimum ratios as Tables 3 to 5. FIG. 2 is an explanatory diagram showing the correlation between the ratio and the rupture rate upon closure in the form of a scatter diagram. It is an explanatory view showing the force in the opening direction, the upward force, and the pushing force when the cap is closed using arrows.

Next, the present invention will be explained in detail based on the embodiments shown in FIGS. 1 to 19. In the figure, 1 is a cap that is attached to a spout a that is the mouth of the container, and the cap 1 includes a cap body 2 that is screwed and attached to the spout a, and an annular tamper-evident band 3 located below the cap body 2. The cap body 2 and the tamper-evident band 3 are integrally molded from a synthetic resin material. See Figure 1

(cap body)
The cap body 2 has a peripheral wall 5 extending downward from the periphery of the top plate 4 that can close the spout portion of the spout a on the lower surface side, and the cylindrical portion constituted by the peripheral wall 5 is It has a tapered shape that opens slightly downward. The inner surface of the peripheral wall 5 has an internal thread that is screwed into the external thread of the spout a. Further, the cross-sectional shape of the lower side of the peripheral wall 5 is made thick so as to project outward in the radial direction of the cap, and a slope is formed from the side surface of the peripheral wall 5 to the thick portion. See Figure 4

An inner ring 4a is provided on the lower surface of the top plate 4 in a hanging state. When the cap 1 is attached to the spout a, the inner ring 4a enters the inside of the spout a and is able to come into sliding contact with the inner surface of the spout so that the contents in the container do not leak out. be.

As shown in FIGS. 1 and 2, on the outer periphery of the peripheral wall 5, a plurality of protrusions 5a are integrally provided on the outer circumferential side of the circumferential wall 5 to prevent the fingertips from slipping when turning the cap when opening and closing the cap. It is located. As shown in the figure, each of the finger-holding protrusions 5a is formed in a straight line from the upper side to the lower side of the peripheral wall 5 so as to be convex radially outward of the cap body. In the case of this embodiment, the protrusions 5a do not all have the same amount of protrusion toward the outside in the radial direction, but the protrusions 5a with large protrusions are arranged on all sides, and the protrusions 5a are Two protrusions 5a with a medium overhang amount are arranged between the protrusion 5a with a large protrusion amount, and further between two protrusion ridges 5a with a medium overhang amount, a minimum overhang amount is arranged. A protrusion 5a is arranged.

(tamper-evident band)
As mentioned above, the tamper-evident band 3 is located at the bottom of the peripheral wall 5 of the cap body 2, but it is not integrated over the entire lower side of the peripheral wall 5, but is connected at four points as shown below. It continues to the lower part of the peripheral wall 5 via the section 6. See Figures 7, 9, and 10.

Furthermore, when the cap 1 is screwed onto the spout a and the cap 1 is in the normal position (the position where the spout part of the spout a is closed), the tamper-evident band 3 is attached to the external thread in the height direction of the spout a. It corresponds to a lower height position, and is arranged so as to correspond to the portion where the locking protrusions b protrude outward at four equally spaced locations in the circumferential direction of the spout a. . See Figure 6

(Long division band, short division band)
The tamper-evident band 3 is shaped so as to be divided into four divided band parts, and the four divided band parts are arranged in an annular manner. The four divided band parts consist of two long divided bands 7 and two short divided bands 8 whose length in the band circumferential direction is shorter than the long divided band 7. The long divided bands 7 and the short divided bands 8 are arranged alternately in the band circumferential direction. The long divided band 7 and the short divided band 8 are connected to the cap body 2 via the connecting portion 6 at the upstream end portions 12 and 14 of the long divided band 7 and the short divided band 8 in the opening direction X, respectively. It is continuous with the lower part of the peripheral wall 5. See Figures 7 and 10.

Each of the long divided band 7 and the short divided band 8 includes a band peripheral wall 3a and a band top plate 3b extending from the upper end of the band peripheral wall 3a toward the center of the tamper-evident band 3, as shown in FIG. The band circumferential wall 3a and the band top plate 3b are provided in a vertical cross-sectional shape in an inverted substantially L-shape.

(bridge)
The long divided band 7 and the short divided band 8 which are adjacent in the circumferential direction of the band are separably connected via a bridge 9 which is breakable and breaks when a rotation operation in the opening direction is performed during opening. ing. The tamper-evident band 3 is formed into an annular shape by connecting the adjacent long and short bands 7 and 8 via the breakable bridge 9. See Figure 7

(locking claw)
On the inside of the tamper-evident band 3, as shown in FIGS. 5 and 6, there is a locking pawl 10 that runs along the inner surface of the tamper-evident band 3 and extends in the opening direction. It is provided. As will be described later, the locking pawl 10 is located inside the long band 7 and the short band 8, and the base end portion of the locking pawl 10 is located between the long band 7 and the short band 8. It is integrated with the peripheral wall 3a, and the upper end portion of the locking pawl 10 is integrated with the band top plate 3b of the long split band 7 and the short split band 8.

The locking claw 10 locks with the locking projection b when rotating in the opening direction X during unsealing, and serves to restrict the rotation of the tamper-evident band 3 in the opening direction X. That is, the locking claw 10 is provided so as to lock with the locking projection b when the tamper-evident band 3 is rotated in the opening direction X. The locking claw 10 itself is flexible enough to overcome the locking projection b when rotating in the closing direction Y, and smoothly moves over the locking projection b when rotating in the closing direction Y to initially attach the cap 1 to the spout.

When the cap 1 is attached to the spout for the first time (at the time of capping), the locking claw 10 itself bends and locks onto the inner surface of the divided bands (long divided band 7 and short divided band 8) as described above. It deforms so as to get over the protrusion b, and when it finishes getting over the locking protrusion b, it undergoes elastic deformation and returns to its original shape.

Therefore, when getting over the locking protrusion b, a restoring force acts on the locking protrusion b side, and as a reaction force from the locking protrusion b, the divided bands (long divided band 7 and short divided band 8) themselves are pushed outward. This will force it to push out. Then, a tensile force is generated along the circumferential direction of the tamper-evident band 3 so that the diameter of the tamper-evident band 3 expands, and this tensile force is applied to the bridge 9. Also, as will be described later, the bridge 9 is provided so as not to break.

(Latching claw arrangement)
When the cap 1 is turned in the opening direction X in order to open the cap, the four breakable bridges 9 are broken. All bridges 9 are not broken at the same time. One set of bridges 9 facing in a first radial direction R1 of the tamper-evident band 3 is another set of bridges 9 facing in a second radial direction R2, which is a radial direction different from the first radial direction R1. It is arranged so that it breaks after the breakage of the cap body 2, that is, the break timing is slightly shifted, and a large rotational force is not required when turning the cap body 2 in the opening direction X. See Figure 7

As shown in FIGS. 5, 11, and 14, two locking claws 10 are provided on the inside of the long band 7 and the short band 8, respectively. In order to shift the break timing, the locking pawl 10 is arranged in the circumferential direction of the band so that when the cap body 2 is turned in the opening direction X, the tamper-evident band 3 is also opened. When the long split band 7 begins to rotate in the stopper direction X and the locking pawl 10 provided on the downstream side of the long split band 7 in the open direction The short divided bands 8 are adjacent to each other on the downstream side in the opening direction X, and the locking pawl 10 provided on the downstream side in the opening direction The arrangement is such that they are located close to each other. In addition, in FIG. 14, the arrangement for achieving the non-latching state is indicated by the amount of deviation A.

When opening, the locking protrusion b that is locked by the locking claw 10 of the long split band 7 is the one downstream in the opening direction of the two locking claws 10 of the long split band 7, as shown in FIG. This is a locking protrusion b located on the downstream side in the opening direction with respect to the locking claw 10 on the side. Furthermore, the locking protrusion b that the locking claws 10 of the short split band 8 are close to without contacting each other as described above is the locking claw on the downstream side in the opening direction of the two locking claws 10 of the short split band 8. 10, the locking protrusion b is located on the downstream side in the opening direction.

Two locking claws 10 are provided on each of the long and short split bands 7 and 8. This is so that if the locking claw 10 closest to the corresponding locking projection b fails to lock, the locking claw 10 upstream of the failed locking claw 10 in the opening direction will lock onto the locking projection b, breaking the bridge. To ensure that the bridge breaks, two locking claws 10 are provided on each side.

(Bridge with tip break second radial direction R2)
When the cap body 2 is rotated in the opening direction X for opening, the locking claw 10 on the downstream side of the long split band 7 in the opening direction X locks with the locking protrusion b. The rotation of the long dividing band 7 in the opening direction X is restricted and stopped. Moreover, the short divided band 8 adjacent to the downstream end 11 of the long divided band 7 in the opening direction A force to rotate in the opening direction X is applied to the upstream end portion 12 in the direction X via the connecting portion 6 as the cap body 2 moves.

Since the operation of rotating the cap body 2 in the opening direction X for unsealing continues, the downstream end 11 of the long split band 7 in the opening direction the short divided band 8 adjacent to this on the downstream side in the opening direction X; and the long divided band 7 adjacent to this short divided band 8 on the downstream side in the opening direction X. A force is continuously applied to the upstream end 12 of X to rotate it in the opening direction X.

A bridge 9 is located between the downstream end 11 of the long divided band 7 in the opening direction X and the upstream end 14 of the short divided band 8 in the opening direction and a state in which a tensile force is applied to the bridge 9 located between the downstream end 13 of the short divided band 8 in the opening direction X and the upstream end 12 of the long divided band 7 in the opening direction X. becomes.

Furthermore, in this embodiment, the downstream end 11 of the long split band 7 in the opening direction X and the upstream end 14 of the short split band 8 in the opening direction and the bridge 9 located between the downstream end 13 of the short split band 8 in the opening direction X and the upstream end 12 of the long split band 7 in the opening direction X. Of these, the bridge 9 located between the downstream end 13 of the short split band 8 in the opening direction X and the upstream end 12 of the long split band 7 in the opening direction X is broken first. It is provided.

(Bridge of post-rupture first radial direction R1)
If the bridge 9 (early broken bridge) between the upstream end 12 of the long split band 7 in the opening direction X and the downstream end 13 of the short split band 8 in the opening direction X breaks first, The tamper-evident band 3 is split into two parts, and the upstream end 12 of the long split band 7 in the opening direction X is the most outwardly extending part of the tamper-evident band 3 due to the action of a spring member 15, which will be described later. overhangs outward in the radial direction. Then, by changing the position of the long divided band 7 toward the outside in the radial direction of the tamper-evident band 3, the locking claw 10 on the downstream side in the opening direction X of the long divided band 7 moves away from the locking projection b. It is made to come off easily.

As described above, even after the bridge 9 between the upstream end 12 of the long split band 7 in the opening direction X and the downstream end 13 of the short split band 8 in the opening direction The main body 2 is rotated in the opening direction X.

Since the short divided band 8 is connected to the cap body 2 via the connecting part 6 located at the upstream end 14 of the short divided band 8, the above-mentioned continuous movement in the opening direction X of the cap body 2 Due to the rotational operation, a rotational force is applied from the cap body 2 in the opening direction X. Since the locking claw 10 near the downstream end 11 of the long split band 7 in the opening direction X is locked with the locking protrusion b, this locking ( movement stop) and the rotation of the short divided band 8 in the opening direction X, the downstream end 11 of the long divided band 7 in the opening direction X and the upstream end 14 of the short divided band 8 in the opening direction X. A tensile force is applied to the bridge 9 between the two, and this bridge 9 breaks as a post-break bridge. Further, when the bridge 9 is broken, the locking pawl 10 on the downstream side of the long split band 7 in the opening direction X is disengaged from the locking protrusion b.

In this way, all the bridges 9 are not broken at the same time, but a set of bridges 9 facing each other in the second radial direction R2 of the tamper-evident band 3 is broken first as a first breaking bridge, and the second bridge is broken first. Another set of bridges 9 facing in the first radial direction R1, which is a radial direction different from the radial direction R2, is arranged as a post-breaking bridge to break after the breakage of the first breaking bridge, so that the breaking timing is adjusted. It is set to shift.

Then, when opening the package, when the cap is rotated in the opening direction In addition, the drag force from the post-rupture bridge 9 (uncut bridge), which is the next to which tensile force is applied after the first fracture bridge 9 breaks, is also smaller than in the case of four simultaneous fractures. It is smaller in comparison, and the rotational force applied to the cap body 2 in order to cut the bridge 9 can be reduced, making it possible to easily open the cap without requiring a large force for the opening operation.

Note that the lag time between the break timing when the first break bridge breaks and when the back break bridge breaks is set to be extremely short, so as not to impair the smooth opening operation.
Hereinafter, in order to clarify the arrangement of two sets of first breaking bridges and two sets of second breaking bridges in the drawings, two bridges 9 which are rear breaking bridges and which face each other in the first radial direction R1 will be shown. The reference numerals 92 and 94 are also indicated for the bridges, and the reference numerals 91 and 93 are also indicated for the two bridges 9 facing each other in the second radial direction R2, which are first broken bridges.

(Spring member)
The cap 1 of the present invention is designed to easily visually confirm that the tamper-evident band 3 has been broken and opened when it is attached to the spout a. The device is such that the tamper-evident band 3 is brought into contact with the outer end c of the locking protrusion b in the spout radial direction from the tamper-evident band 3 side, and the tamper-evident band 3 is connected to the outer end c of the spout radial direction. It is constructed by providing a spring member 15 that urges the device outward. See Figures 12 and 13.

First, the upstream end 12 of each of the long split bands 7 in the opening direction X consists of the band lower side 16 cut out from the upper side of the band peripheral wall 3a and the spring member 15. The band lower side 16 and the downstream end 13 in the opening direction X of the short divided band 8 adjacent to the band lower side 16 are continuous via the bridge 9 (91, 93), which is a tip-broken bridge.

Further, the upstream end 12 of the long split band 7 in the opening direction X corresponds to the connecting portion 6, and the lower side 16 of the band corresponds to the connecting portion 6. A spring member 15 is provided between the band lower side 16 and the connecting portion 6.

The spring member 15 includes a diagonal support 17 whose lower end portion rises continuously with the band lower side 16 and is inclined toward the spout a side (the center side of the tamper-evident band); It consists of a plate-shaped receiving plate 18 that is continuous with the upper end portion of the spout and has a flat surface facing the spout a side (the center side of the tamper-evident band). The upper end portion of the receiving plate 18 of the spring member 15 is continuous with the connecting portion 6.

(Diagonal support of spring member)
The diagonal strut 17 of the spring member 15 is a strut that can be bent and deformed radially outward of the tamper-evident band 3 (radially outward of the spout). Then, the bridges 9 (91, 93) lined up on the lower side of the band 16 are in an unbroken state, and a force is applied to the receiving plate 18 to push the tamper-evident band 3 outward in the radial direction. When the diagonal support 17 is in the opened state, the diagonal support 17 becomes deflected, and the restoring force that tries to restore this deflection causes the band lower side 16, that is, the upstream side of the long split band 7 in the opening direction The end portion 12 is configured to generate a biasing force that biases the tamper-evident band 3 radially outward.

As will be described later, even in the unopened state after capping, the four bridges 9 (91, 92, 93, 94), including the post-rupture bridge 9, are not fractured. A biasing force that biases the upstream end 12 of the long split band 7 in the opening direction is causing it.

(Receiver plate for spring member)
As described above, the upper end portion of the receiving plate 18 of the spring member 15 is continuous with the connecting portion 6. Even when the diagonal strut 17 is bent and deformed, the upper end portion of the receiving plate 18 continues to the connecting portion 6, and even when the tip-broken bridge 9 is broken, the upper end portion of the receiving plate 18 continues to the connecting portion 6. Continuous.

The receiving plate 18 itself is offset toward the center of the tamper-evident band 3 from the position of the band peripheral wall 3a. In addition, in the radial positional relationship of the tamper-evident band 3 when the cap 1 is attached to the spout a and unopened, the flat surface 19 of the receiving plate 18 facing the spout a side and the locking protrusion b of the spout a It is arranged so that it is not connected to the other outer circumferential surface d but is separated from it. See Figure 14

Similarly, in the radial positional relationship of the tamper-evident band 3 when the cap 1 is attached to the spout a and unopened, the position of the flat surface 19 of the receiving plate 18 facing the spout a side is the same as that of the locking protrusion b. It is provided so as to be closer to the center of the tamper-evident band 3 (center side of the spout a) than the spout radial outer end c.

When the cap 1 is attached to the spout a and in an unopened state, and the cap 1 is in the proper closed position relative to the spout a, the spring member 15 is set to be located outside the locking protrusion b.

Further, as described above, the receiving plate 18 is biased toward the center of the tamper-evident band 3 from the position of the band peripheral wall 3a, and overlies the tamper-evident band 3 in the cross-sectional shape of the spout a where the locking protrusion b is located. As shown in FIG. 14 showing the wrapped state, the receiving plate 18 is formed such that the flat surface 19 of the receiving plate 18 enters the area of the locking protrusion b.

Therefore, when the spring member 15 is located outside the locking projection b in an unopened state, the flat surface 19 of the receiving plate 18 and the outer end c of the spout radial direction of the locking projection b correspond to the receiving plate 18. is in contact with the outer end c of the spout radial direction of the locking projection b, and the receiving plate 18 is pushed outward in the spout radial direction by the locking projection b. See Figures 6 and 11.

The receiving plate 18 is pushed outward in the spout radial direction by the locking protrusion b, thereby bending and deforming the diagonal support 17. Then, a restoring force is generated as a resistance against the bending deformation, and this restoring force urges the spring member 15 to push the band lower side 16 radially outward of the tamper-evident band 3. Therefore, the spring member 15 causes the upstream end 12 to be attached to the upstream end 12 of the long split band 7 in the opening direction A biasing force is applied at all times.

As shown in FIG. 13, the ends of the receiving plate 18 facing each other in the circumferential direction of the band are rounded so as to have a surface shape of a circular arc in cross section. When the prevention band 3 moves in the opening direction The projection b is designed to be properly positioned on the outer end surface of the spout in the radial direction.

In the embodiment, when the cap body 2 is in an angular position that properly closes the spout a, including an unopened state, the locking protrusion b and the spring member 15 correspond in positional relationship in the spout circumferential direction. , the locking protrusion b and the spring member 15 are set to be lined up in the spout radial direction. See Figure 6

The receiving plate 18 itself may have any shape as long as it does not engage with the locking protrusion b when the tamper-evident band 3 rotates in the closure direction Y during the initial attachment of the cap 1, and may have the shape described above. Not limited.

(Extrusion of split band by spring member)
In this embodiment, by rotating the unopened cap 1 in the opening direction The bridge 9 (92, 94) is provided to break after the bridge 93) breaks. When the cap body 2, which was removed from the spout a after the later broken bridge 9 (92, 94) is broken, is reattached to the spout a and screwed to close it, the locking protrusion b on the spout a side and the locking protrusion b on the spout a side as described above The upstream end 12 in the opening direction X of the long divided band 7 of the tamper-evident band 3 cut into four pieces corresponds to each other.

Then, the receiving plate 18 of the spring member 15 at the upstream end 12 of the long split band 7 in the opening direction The projection b pushes the spout radially outward. That is, the spring member 15 is a part of the long split band 7, and the receiving plate 18 of the spring member 15, which is continuous with the cap body 2, is located closer to the center than the band peripheral wall 3a, and the diagonal support 17 is tilted without bending. Since it has a straight line shape, the long divided band 7 is in a state of projecting radially outward of the tamper-evident band 3 (radially outward of the spout). See Figure 15

Even if the cap 1 is attached to the spout a after being opened, the long divided band 7 will protrude outward as described above, so that it can be easily confirmed visually that the cap 1 has been opened.

Even if the protruding long split band 7 is pushed in, the long split band 7 is pushed out by the action of the restoring force from the spring member 15 side overlapping the locking protrusion b, making it impossible to restore the long split band 7 to the unbroken tamper-evident band 3 state. Therefore, it is possible to maintain a shape that makes it easy to determine that it has been opened.

(Bridge height and width)
The cap 1 of the present embodiment can solve the above-mentioned problem, and it is possible to prevent fraud when manufacturing a product that attaches this cap 1 to a spout a provided on a flexible container or the like, that is, when capping. The four bridges 9 (91, 92, 93, 94) of the tamper-evident band 3 do not break, and furthermore, they cannot be opened by regular opening operations, such as when opened by a user (for example, a purchaser) who handles container products. It is provided so that all the bridges 9 (91, 92, 93, 94) are broken when turned in the stopper direction X.

In this way, in order to prevent the four bridges 91 to 94 from breaking during capping and to ensure that all four bridges 91 to 94 are broken when unsealing, in the present invention, each of the four bridges 91 to 94 is The height H of the bridges 91 to 94 is greater than the width T of the bridge.

The height H of the bridges 91 to 94 refers to the distance from the position of the upper end surface to the position of the lower end surface of the bridges 91 to 94, and is indicated by the symbol H in FIGS. 2 and 8, for example. There is. In terms of the height H of the bridges 91 to 94 and the direction of the tensile force applied to the bridges 91 to 94, a tensile force is applied to the bridge 9 along the circumferential direction of the tamper-evident band 3 during capping and opening. The distance perpendicular to the direction in which this tensile force is applied and in the cap height direction is defined as the height H of the bridges 91 to 94.

The width T of the bridges 91 to 94 is indicated using the symbol T in FIG. 5, which shows the tamper-evident band 3 viewed from below, for example. To explain the width T of the two post-break bridges 92 and 94 facing in the first radial direction R1, the tangent line touching the position of the outer surface of the bridges 92 and 94 (the curved surface along the circumferential direction of the tamper-evident band) This refers to the distance in the radial direction of the tamper-evident band 3 between the inner surface (the curved surface along the circumferential direction of the tamper-evident band 3), and the direction in which the tensile force is applied (the tamper-evident band 3). This refers to the distance perpendicular to the circumferential direction of the tamper-evident band 3) and apart in the radial direction of the tamper-evident band 3.

To explain the width T of the two first-break bridges 91 and 93 facing in the second radial direction R2, there is a tangent line touching the outer surface of the bridges 91 and 93, and a downstream of the short split band 8 of the bridges 91 and 93. The position of the boundary with respect to the side end 13 indicates the distance apart in the radial direction of the tamper-evident band 3, perpendicular to the direction in which the tensile force is applied, and in the radial direction of the tamper-evident band 3. Refers to the distance apart. The tip-break bridges 91 and 93 are formed in a shape in which the thickness gradually decreases toward the downstream end 13, and the width T indicates the distance at the minimum thickness.

(Different ratios of height to width)
In the cap 1 of this embodiment, the ratio of height H to width T of the two first-break bridges 91, 93 (bridges 9 arranged in opposing positions in the second radial direction R2) is different from the ratio of height H to width T of the two rear-break bridges 92, 94 (bridges 9 arranged in opposing positions in the first radial direction R1), and the ratio of height H to width T of the first-break bridges 91, 93 is greater than the ratio of height H to width T of the rear-break bridges 92, 94.

As shown, the broken-off bridges 91 , 93 are located between the lower band edge 16 on which the spring member 15 is located and the downstream end 13 of the short split band 8 and are adjacent to the spring member 15 . These bridges are in position and are designed to resist shear forces compared to post-rupture bridges 92, 94.

(Range of height to width ratio)
In addition, in the cap 1 of the present embodiment, in order to obtain a cap 1 in which the bridge 9 does not break during capping and all bridges 9 break when opened, the height H of the bridge 9 with respect to the width T is set at a good value. The study to determine the ratio was conducted as follows.

(1) In the above study, a cap molded from a four-cavity mold and a currently available cap (hereinafter referred to as a commercially available product) were used.
(2) Using these caps, evaluate bridge breakage (presence or absence of breakage) when capping (capping) and opening (opening), and compare the bridge breakage evaluation results when capping (Table 1) and Table 2 (Fig. 16). The evaluation results are shown in Table 1.Evaluation results of bridge breakage when the bottle is opened.
(3) Capping was performed using a filling device manufactured by Toyo Jidoki Co., Ltd. Thereafter, bridge breakage was visually evaluated.
(4) Opening (opening) was performed by turning the capped container with the hands of multiple people. Thereafter, bridge breakage was visually evaluated.

(Cap mold used for study)
(1) In molding the cap for consideration, a molding die with four cavities #1, #2, #3, and #4 having the same cavity was prepared in advance. In order to mold a study cap for evaluating bridge breakage by varying the above ratio, we first used cavity #4, which can mold the current product, as a standard, and other cavities (#1 to 3). The following processing was performed on the bridge forming area.
(2) In cavity #1, the height H of the bridges 91 and 93 is 0.06 mm higher than the height H of the bridges 91 and 93 in the cap molded in the reference cavity #4. The targeted processing was applied.
(3) In cavity #2, the height H of bridges 91, 92, 93, 94 is 0.03 mm higher than the height H of bridges 91, 92, 93, 94 in the cap molded in reference cavity #4. The process was done to form a taller cap.
(4) A molding die having four cavities was manufactured in this way, and a cap for examination was molded using this molding die. Note that the cap molded with cavity #2 was not used for study.
(5) The commercially available product also used for consideration is a cap with a tamper-evident function that can be attached to the spout a of the container described above. This commercially available product is manufactured with the aim of ensuring that the bridge does not break when capping, but breaks when opening, and bridges are placed at four locations around the circumference of the tamper-evident band. It is a cap that has been used.
Note that the commercially available product does not have a portion corresponding to the spring member in the tamper-evident band 3 of the present invention. Furthermore, it was not newly molded for this study.

(Evaluation of bridge breakage when closing the cap)
Using the four types of caps, capping was performed using a filling device manufactured by Toyo Jidoki Co., Ltd. as described above, and the presence or absence of broken bridges when closing the caps with these four types of caps was evaluated. Figure 16) shows this. Note that in Tables 1 and 2, Cap 1, Cap 2, Cap 3, and Cap 4 are four types of caps for consideration.

(Cap 1 in the table)
For cap 1 in the table, the height H of the bridge at the position corresponding to bridges 91 and 93 is 0.06 mm higher than the height H of the bridge at the position corresponding to bridges 91 and 93 of the cap in reference cavity #4. Cavity #1 is used, which has been processed with the aim of molding a cap of the type, and the cap is molded by this cavity #1.
As described above, the bridges 91 and 93 are located at opposite positions in the second radial direction R2. Therefore, the bridges located at positions corresponding to these bridges 91 and 93 are also located at positions opposite to each other in the second radial direction R2, and the bridge corresponding to bridge 91 is given the symbol (1), and the bridge corresponding to bridge 93 is (3) is shown.
Similarly, since the bridges 92 and 94 are located at positions facing each other in the first radial direction R1, bridges corresponding to these bridges 92 and 94 are also located at positions facing each other in the first radial direction R1. The bridge corresponding to the bridge 94 is indicated by the symbol (2), and the bridge corresponding to the bridge 94 is indicated by the symbol (4).

(Cap 2 in the table)
For cap 2 in the table, the height H of the bridges at positions corresponding to bridges 91, 92, 93, and 94 is higher than the height H of the bridges at positions corresponding to bridges 91 to 94 of the cap in reference cavity #4. Cavity #3, which was processed with the aim of molding a cap that is 0.03 mm higher, is used, and the cap is molded with this cavity #3.

(Cap 3, Cap 4 in the table)
Cap 3 in the table is a reference cap, and cap 4 in the table is the above-mentioned commercial product.

(When the valve is closed - evaluation results)
Regarding bridge breakage during plugging, none of the bridges broke in cap 1 molded from cavity #1 as shown in Table 1. Furthermore, bridges (2) and (4) corresponding to the rear break bridge (first radial direction R1) did not break in any of the caps 1 to 4 examined.
Therefore, it can be determined that caps 1 and 4 are good in terms of preventing bridge breakage when capping.

(Evaluation of bridge breakage when opening the bottle)
The caps of the containers capped using four types of caps were opened by turning the caps with the hands of multiple people as described above. Thereafter, bridge breakage was visually evaluated, and the presence or absence of bridge breakage is shown in Table 2 (FIG. 16).

(Evaluation results when opened)
Regarding the breakage of bridges when opening the bottle, as shown in Table 2, in Cap 1, all bridges broke. In Caps 2 and 3, only bridge (2) did not break. In Cap 4, many bridges did not break.
From the evaluation results when opening the cap, it can be judged that the cap 1 is good in terms of bridge breakage when opening the cap, since all bridges are broken. In addition, it can be judged that the cap 4 (distributed product) is molded with emphasis on the point that the bridge does not break during capping.

From the above, it can be determined that Cap 1 is good in the evaluation results for bridge breakage when the cap is closed and when it is opened. Therefore, it can be determined that by molding a cap under the conditions of cavity #1, a good cap can be obtained in which no bridge breakage occurs when the cap is closed and all bridges break when the cap is opened.

Normally, when a large number of synthetic resin products are continuously molded from one molding die, the molded products are molded with a slight molding error. Even in this synthetic resin cap that is molded using the four-cavity mold described above, there are molding errors in each molding, and the bridges (1) to each other, the bridges (2) to each other, and the bridges (2) to each other. The widths and heights of the bridges (3) and the bridges (4) are not exactly the same, and there is a slight molding error. Therefore, in Cap 1, which was judged to be good in both bridge breakage (closed) and bridge non-breakage (opened), the width and height values of bridges (1), (2), (3), and (4) , a good range can be derived for the ratio of height to width.

Then, we next measured the width and height of bridges (1), (2), (3), and (4) of cap 1, which is molded using cavity #1, and investigated the optimum range of height-to-width ratio. We also measured the width and height of bridges (1), (2), (3), and (4) of caps 2 and 3, which are molded using cavity #3 and cavity #4, and derived the range of height-to-width ratio. The results are explained below.

(Measurement of the width and height of the bridge against the consideration cap)
Measure the width and height of bridges (1), (2), (3), and (4) of caps 1, 2, and 3 molded from cavities #1, #3, and #4, and average the obtained values. (Width, Height Ave), Maximum (Width, Height Max), Minimum (Width, Height Min) as shown in Figure 17 Table 3 Width, Height Ave, Table 4 Width, Height Max, Table 5 Width , height Min, and the average, maximum, and minimum ratios of height to width are also shown in Tables 3 to 5.
The length dimension was measured using an image dimension measuring instrument KEYENCE IM7030 manufactured by KEYENCE Co., Ltd. under the condition of a projecting light source. The number of samples (n number) is 10.

(Scatter plot)
From the measured values, the ratio of height to width (height/width) at bridges (1) and (3) of cap 1, cap 2, and cap 3, and the bridge (1 ) and (3) were plotted as a scatter plot to confirm the presence or absence of a correlation. As a result, as shown in the scatter diagram shown in FIG. 18, it was found that there was a correlation between the rupture rate upon closure and the ratio (height/width) of bridges (1) and (3).

It was also confirmed that the range of the ratio (height/width) of the bridges (1) and (3) of the cap 1 fell within the range of the extremely good rupture rate (%) based on the above correlation.

Based on the measurement results, it can be determined that the bridge ratio (height/width) that does not break when the cap is closed is within the range of 1.11 to 1.30 for bridges (1) and (3). Further, regarding the ratio (height/width) of bridges (2) and (4), it can be determined that a range of 1.01 to 1.22 is good based on the performance of cap 1.

From the above, as shown in this embodiment, it is preferable that the height H of each of the four bridges 9 (91, 92, 93, 94) be larger than the width T of the bridge.
Furthermore, the ratio of the bridge height H to the width T of the bridges 91 and 93 at positions facing each other in the second radial direction R2 is greater than the ratio of the height H of the bridge at positions facing each other in the first radial direction R1. The ratio of the height H of the bridge to the width T of the bridge in 92 and 94 is preferably greater.
Note that the range of the ratio between the bridge that breaks first and the bridge that breaks later is 1.01 to 1.22 for the bridges 92 and 94 that break first, and 1.11 to 1.30 for the bridges 91 and 93 that break first. However, as described above, the ratio (height/width) of the bridges 91 and 93 that break first is made larger than the ratio (height/width) of the bridges 92 and 94 that break later.

(shear)
In the cap 1 according to the embodiment of the present invention, as described above, the ratio of the height H to the width T of the first broken bridges 91 and 93 is the same as the height to the width T of the later broken bridges 92 and 94. It is said to be larger than the ratio of H. The tip-broken bridges 91 and 93 are located between the band lower side 16 at the upstream end 12 of the long split band 7 in the opening direction X and the downstream end 13 of the short split band 8 in the opening direction X. This bridge is located in a position where the diagonal support 17 exists nearby, and is formed as a bridge that is more effective in resisting shearing force (force along the cap height direction) than the later-breaking bridges 92 and 94. It is something that exists.

Here, in order to clearly explain that the tip-break bridges 91 and 93 are formed as bridges that resist the shearing force applied during capping, we will explain the long split band 7 where the band lower side 16 is present. The upstream end 12 in the opening direction X is rephrased as the downstream end 12 of the long split band 7 in the closing direction Y (the portion indicated by the reference numeral 12 itself remains unchanged). In addition, the downstream end 13 of the short split band 8 in the opening direction do not have).

As shown in FIGS. 5 and 7, the band lower side 16, which is the downstream end 12 in the closure direction Y of the long split band 7, is connected to the cap body 2 in the vertical direction via the connecting portion 6 and the diagonal support 17. (see FIG. 12), and the lower side 16 of the band is a portion that is directly supported by the cap body 2 from above. Further, a locking pawl 10 is arranged inside the upstream end 13 of the short split band 8 in the closure direction Y. As shown in the figure, the bridges 91 and 93 are arranged close to the spring member 15 continuous to the cap body 2, and are also arranged close to the locking claw 10.

During capping, when the locking pawl 10 of the short split band 8 rides over the locking protrusion b, resistance is generated to the movement of the locking pawl 10, and the split band 8 with the locking pawl 10 riding on the locking protrusion b moves in the closing direction. It becomes difficult to move toward Y and downward.
At this time, as shown in FIG. 19, a force F1 directed in the opening direction The upstream end 13 in direction Y becomes difficult to move downward.

On the other hand, on the band lower side 16 which is the downstream end 12 in the closing direction Y of the long divided band 7 adjacent to the short divided band 8, there is a connection part 6 and a spring from the cap body 2 that descends while rotating to close. A downward force F3 is applied via the member 15 (diagonal support 17), and the cap main body 2 rotates in the closing direction Y while moving downward. Therefore, the positions of the upstream ends 13 of the adjacent short divided bands 8 and the downstream ends 12 (band lower sides 16) of the long divided bands 7 are shifted in the vertical direction.

Since the positions of the upstream end 13 of the short split band 8, which is difficult to move downward due to the upward force F2, and the downstream end 12 of the long split band 7, which moves downward due to the downward force F3, are shifted in the vertical direction, a shear force, which is a force along the cap height direction, is applied to the previously broken bridges 91, 93.
However, as described above, the pre-break bridges 91, 93 are provided such that the ratio of the bridge height H to the bridge width T is greater than 1, so that the bridges 91, 93 do not break against the shear force during capping.

Shearing force is also applied to the post-rupture bridges 92 and 94 during capping. That is, when the locking pawl 10 of the long split band 7 gets over the locking protrusion b during capping, a force F1 directed in the opening direction X and an upward force F2 are applied, and the locking pawl of the short band 8 10 gets over the locking protrusion b, a force F1 in the opening direction X and an upward force F2 are applied. Then, by shifting the timing of applying the upward force F2, the end of the long split band 7 (downstream end 11 in the opening direction The position of the end portion of the band 8 (the upstream end portion 14 in the opening direction X) is also shifted in the vertical direction.

Also, for the bridges 92 and 94 that are to be broken later, the ratio of the bridge height H to the bridge width T is set to be greater than 1, so that the bridges 92 and 94 will not break against the shearing force during capping. It is set in.

The band is disposed continuously from the cap body 2 to the band lower side 16 supported via the connecting part 6 and the spring member 15, and the band lower side 16 moves downward while being pushed by the cap body 2 during capping. There is a high possibility that the vertical displacement of the first-broken bridges 91 and 93 during capping will be larger than the vertical displacement of the later-broken bridges 92 and 94.
However, the bridges 91 and 93 that break first have a ratio of the bridge height H to the bridge width T that is larger than the ratio of the bridges 92 and 94 that break later, so that the lower side 16 of the band to which the downward force F3 is applied during capping. Since the bridges 91 and 93 in consecutive positions have enhanced ability to withstand shearing force, the bridges 91 and 93 that break first will not break during capping.
Therefore, in the cap 1 of the present embodiment, the four bridges 9 are not separated when capping, and all four bridges 9 are properly separated when opened, which is highly effective in preventing unauthorized opening. It is equipped with the following.

1... Cap 2... Cap body 3... Tamper-evident band 6... Connecting portion 7... Long split band 8... Short split band 9... Bridge 91... Bridge with tip break (arranged in second radial direction)
92... Post-rupture bridge (arranged in the first radial direction)
93...Bridge with tip break (arranged in second radial direction)
94... Post-rupture bridge (arranged in the first radial direction)
10...Latching claw 11...Downstream end in the opening direction (long split band)
12...Upstream end in opening direction (long split band)
13...Downstream end in opening direction (short split band)
14...Upstream end in opening direction (short split band)
15...Spring member 16...Band lower side 17...Diagonal support 18...Receiving plate , 94 arrangement)
R2...Second radial direction (bridge 91, 93 arrangement with tip breakage)
T...Width of the bridge H...Height of the bridge F1...Force directed in the opening direction from the locking protrusion side F2...Force directed upward from the locking protrusion side F3...Force applied downward from the cap body

Claims (3)

The cap body includes a cap body that is screwed and attached to the spout, and a tamper-evident band that is located at the bottom of the cap body via a connecting part, and the tamper-proof band is adjacent to the four divided bands. It consists of four breakable bridges that connect the matching divided bands, and each of the divided bands has a lock that locks onto a locking protrusion of the spout when the spout rotates in the opening direction to restrict rotation in the opening direction. The cap is provided with a locking claw, and the bridge is broken when the locking claw locks with the locking protrusion and rotation of the split band in the opening direction is restricted,
The bridge has a height greater than a width of the bridge;
The divided bands and the bridges are arranged alternately in the circumferential direction of the tamper-evident band, and two of the bridges located between adjacent divided bands are arranged in a first position of the tamper-evident band. The remaining two bridges are arranged at opposing positions in a radial direction, and the remaining two bridges are arranged at opposing positions in a second radial direction different from the first radial direction,
The ratio of the height of the bridge to the bridge width of the two bridges arranged at opposite positions in the second radial direction, and the ratio of the bridge height to the bridge width of the two bridges arranged at opposite positions in the first radial direction. It is different from the ratio of the bridge height to the bridge width in the bridge,
The ratio of the height of the bridge to the width of the bridge in the bridges disposed at positions facing each other in the second radial direction is such that the ratio of the height of the bridge to the width of the bridges in the bridges located at positions facing each other in the first radial direction is A cap characterized in that the ratio of the height of the bridge to the width of the bridge is greater . A cap comprising a cap body that is attached by screwing onto a spout, and a tamper-evident band that is located at the bottom of the cap body via a connecting portion, the tamper-evident band being made up of four split bands and four breakable bridges that connect adjacent split bands, the split bands being provided with locking claws that lock onto the locking projections of the spout when rotated in the opening direction, thereby restricting rotation in the opening direction, the bridges being broken when the locking claws lock onto the locking projections to restrict rotation of the split bands in the opening direction,
The bridge has a height greater than a width,
The split bands and the bridges are alternately arranged in a circumferential direction of the tamper-evident band, and two of the bridges between adjacent split bands are arranged at positions opposite each other in a first radial direction of the tamper-evident band, and the remaining two bridges are arranged at positions opposite each other in a second radial direction different from the first radial direction,
A cap characterized in that when an initial opening operation is performed by rotating the cap body attached to the spout in the opening direction, the breakage of two bridges arranged in opposing positions in the second radial direction and the breakage of two bridges arranged in opposing positions in the first radial direction occur non-simultaneously. The four divided bands are two long divided bands and two short divided bands whose length in the band circumferential direction is shorter than the long divided bands, and the long divided bands and the short divided bands are They are located alternately in the circumferential direction of the band.
Each of the two bridges disposed at opposing positions in the second radial direction is connected to a downstream end of the short divided band in the opening direction and an upstream end of the long divided band in the opening direction. The cap according to claim 1 or 2, wherein the cap is a bridge located between the caps .

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