JP6691804B2 - Screw cap - Google Patents

Description

  The present invention relates to a screw cap provided with an opening history indicating band (TE band), and more particularly to a screw cap of a type in which a TE band is divided when the cap is opened.

  A screw cap provided with a TE band that clearly indicates the opening history is widely used for quality assurance of the contents of the container and prevention of tampering. That is, in this type of cap, when the cap is swiveled to open the cap, the bridge connecting the cap body and the TE band is broken, thereby clearly showing the fact that the cap is opened. ..

As a screw cap provided with such a TE band, a type in which the TE band itself is divided when opening the cap is known (for example, Patent Documents 1 to 4). In this type of cap, the TE band is connected to the cap body by a connection part that breaks when the cap is opened and a non-breaking connection part that does not break when the cap is opened. The fracture bridge provided on the dividing surface is fractured and divided and opened, and in this state, it is removed together with the cap body from the container opening. That is, the general consumer can recognize the fact that the cap is opened by observing the state in which the TE band is divided.
When the cap provided with such a split type TE band is opened, the TE band does not remain on the container side and is removed from the container mouth while being connected to the cap. Therefore, when the container content is a beverage, The TE band remaining on the container side does not interfere with drinking and drinking, and when the cap is discarded, the cap can be discarded while the TE band is still connected, so the number of garbage is not increased. Another advantage is that it is easy to dispose.

JP 2004-149156 A JP-A-2006-28181 JP, 2013-103721, A JP-A-2015-217966

By the way, a ratchet that engages with an engaging protrusion formed on the outer surface of the container mouth is provided on the inner surface of the above-described split type TE band, and the TE band is engaged by the engagement of the ratchet and the engaging protrusion. Is prevented from rotating in the opening direction, whereby the fracture bridge of the cross section is fractured, the TE band is disrupted, and in this state, it is removed from the container mouth together with the cap body.
The TE band having such a structure is deformed when the portion where the ratchet is not formed is strongly grasped, and when the TE band is opened as it is, the ratchet and the engaging protrusion do not engage with each other, and the fracture bridge of the divided cross section is divided. Instead, the cap body may be removed from the container mouth.

  In order to prevent the above inconvenience, it is sufficient to increase the number of ratchets provided on the inner surface of the TE band. However, if the number of ratchets is increased, the number of ratchets connected by a breakable bridge is increased. When the ratchet formed at the position closest to the opening direction with respect to the cross section engages with the engaging protrusion on the outer surface of the container mouth, the stress applied to the cross section becomes small, and the cross sections are connected. The rupturable bridge does not rupture, stress concentrates on the non-breaking connecting piece connecting the TE bands, and this non-breaking connecting piece breaks, and as a result, the TE band remains at the mouth of the container. In this state, the cap body is easily removed from the container opening, which is apt to occur. Such a tendency is more remarkable when the non-breaking connecting piece is lengthened in order to prevent the TE band that has been once removed from the container mouth and then divided to return to a shape close to the original shape. Like

  Therefore, an object of the present invention is to provide a screw cap provided with an opening history indicating band (TE band) of a type that separates when the cap is opened, and to prevent an erroneous operation of removing the cap from the container mouth without dividing the band. The cap can be effectively prevented, and when the cap is opened, the cap is held in a state where the non-breaking connecting piece connecting the TE band to the cap body is accidentally broken and the TE band remains at the container mouth. It is an object of the present invention to provide a screw cap with a TE band in which the disadvantage of being removed from the mouth is effectively prevented.

Advantageous Effects of Invention According to the present invention, a cap body fixed to a container mouth portion by screw engagement, and an opening history clearly having a tubular shape and connected to a lower end of a skirt portion of the cap body by a non-breaking connecting piece. A screw which is composed of a band and is divided in the circumferential direction by at least one sectional surface extending in the vertical direction, the sectional surface being connected by a breakable bridge that can be broken when the cap is opened. In the cap,
The inner surface of the opening history indicating band having the above-mentioned cross section has an engagement protrusion formed on the outer surface of the container opening so as to prevent rotation in the cap opening direction but allow rotation in the cap opening direction. A plurality of ratchets that can be engaged are provided,
On the inner surface of the band, at least one convex portion capable of overcoming the engaging projection at the time of opening and closing the stopper is provided at a portion located on the opening direction side with respect to the sectional surface, and the plurality of ratchets are provided. Is provided on the side in the opening direction with respect to the convex portion, and a screw cap is provided.

In the screw cap of the present invention,
(1) The convex portion is provided in an angle range within 45 degrees from the dividing plane on the side in the opening direction.
(2) The protrusion has a lower protrusion height from the inner surface of the band than the ratchet,
(3) A plurality of the dividing planes are formed, the band is multi-divided by the dividing planes, and the convex portion and the plurality of ratchets are formed for each of the divided portions of the band divided by the dividing planes. is being done,
(4) On the inner surface of the TE band, four or more projections and ratchets are provided in total for each divided portion of the band.
(5) The non-breaking connecting piece is a strip having a folded portion,
Is preferred.

  The TE band provided on the screw cap of the present invention is of a split type, and when the cap is opened, the TE band continues to the skirt portion of the cap body, but is in a split open state. Although the opening history of the cap is clearly indicated by the divided state of the TE band, in the present invention, a convex portion (hereinafter referred to as a dummy) having no ratchet function in the vicinity of the opening direction side of the dividing surface on the inner surface of the TE band. It has a remarkable feature in that it is provided with a ratchet).

  That is, this dummy ratchet is formed in such a size or shape that it can get over the engaging projection formed on the outer surface of the container mouth when the cap is rotated in the opening / closing direction. It does not have a ratchet function of tightly engaging with the engaging projection to prevent rotation of the TE band in the opening direction, but like a normal ratchet (hereinafter sometimes referred to as a normal ratchet), it does not come from outside. It has a deformation prevention function that suppresses the deformation of the TE band against the pressing force. In the present invention, since such a dummy ratchet is provided together with a plurality of normal ratchets, the deformation preventing function of the TE band is enhanced, and the deformation of the TE band when the TE band is strongly gripped is effectively suppressed, It is possible to effectively prevent illicit operation of removing the cap together with the TE band from the container mouth without deforming the TE band to divide the band.

  Further, the dummy ratchet is provided in the vicinity of the opening direction of the cross section on the inner surface of the TE band, but the normal ratchets are provided further on the opening direction side than the dummy ratchet. .. In other words, due to the formation of the dummy ratchet, the normal ratchet is provided at a position further away from the dividing surface in the opening direction. Therefore, even if the normal ratchet located closest to the opening direction side engages with the engaging protrusion on the outer surface of the container mouth when the cap is opened, the normal ratchet is divided into sections. Since it exists at a position away from, a large stress is applied to the dividing plane, and the fracture bridge connecting the dividing planes can be rapidly fractured. Therefore, the breakage of the non-breaking connecting piece that connects the TE band to the cap body is effectively prevented, and the cap body is removed from the container opening while the TE band remains at the container opening due to the breaking of the non-breaking connecting piece. It is possible to effectively prevent the inconvenience of being removed.

The side view of the screw cap of this invention. The side sectional view of the screw cap of FIG. The bottom view of the screw cap of FIG. The figure which shows the relationship between the ratchet in the screw cap of FIG. 1, and the protrusion part of a container opening part. FIG. 3 is a half cross-sectional view showing a fitting cross section of the screw cap of FIG. The figure which shows the process which opens the screw cap of FIG. The figure for demonstrating the function of the dummy ratchet formed in the inner surface of the TE band provided in the screw cap of FIG.

  1 to 5, the screw cap of the present invention roughly includes a cap body 1 and a tubular opening history indicating band (TE band) 2, and the cap body 1 is The top plate portion 5 and the skirt portion 6 hanging down from the peripheral portion of the top plate portion 5.

  An inner ring 7 is formed on the inner surface of the top plate portion 5 and extends downward at a distance from the skirt portion 6, and small projections 9 and 9 are formed in a portion between the inner ring 7 and the skirt portion 6. Are formed. A female thread 10 is formed on the inner surface of the skirt portion 6.

A container mouth part to which such a screw cap is attached is shown as a whole by 50 in FIGS. 4 and 5.
The container mouth portion 50 may be, for example, a mouth portion of a bottle depending on the usage of the screw cap, or a tubular spout called a spout welded to a bag-shaped container. Good.
In any form, as can be understood from the half sectional view of FIG. 5, the container mouth portion 50 is an elongated hollow cylindrical body as a whole, and the male thread 51 is formed on the outer surface thereof. An engaging protrusion 53 for controlling the rotation of the TE band 2 is formed below the male thread 51.

  In the container mouth portion 50, the male thread 51 formed on the outer surface of the container mouth portion 50 engages with the female thread 10 formed on the inner surface of the skirt portion 6, whereby the cap is formed. The main body 1 is attached to the container mouth 50. In this state, the upper end of the container mouth portion 50 penetrates into the space between the inner ring 7 and the skirt portion 6, and the upper end surface thereof is in contact with the small projections 9 and 9 formed on the inner surface of the top plate portion 5. The pressure contact ensures a good seal.

Further, as shown in FIG. 2, vertical ribs 12 extending in the axial direction at appropriate intervals are provided on the upper portion of the inner surface of the skirt portion 6. The vertical ribs 12 serve as centering when the cap body 1 is attached to the container mouth portion 50, and prevent the cap body 1 from being diagonally worn.
Further, an anti-slip knurl 15 is formed on the outer surface of the skirt portion 6 so that the cap body 1 can be swung smoothly in the closing direction and the opening direction.

  A plurality of normal ratchets (hereinafter, referred to as normal ratchets) 17 are formed on the inner surface of the TE band 2. As shown in FIGS. 3 and 4, these normal ratchets 17 allow rotation in the closing direction Y, but contact with the engaging projections 53 formed on the outer surface of the container mouth 50. Has a shape that limits the rotation of the TE band 2 in the opening direction X.

As can be understood from FIGS. 2, 3, and 4, the TE band 2 has an inner flange 2a formed on the upper end thereof and protruding inward in the horizontal direction. That is, the upper surface of the inner flange 2a faces the rib 25 (described later) for adjusting the gap at the lower end of the skirt portion 6. A normal ratchet 17 is formed so as to be integrally connected to the inner peripheral surface of the TE band 2 and the lower surface of the inner flange 2a. The normal ratchet 17 is radially inward from the inner surface of the skirt portion 6 and is opened. It is directed toward the direction X side (see FIG. 3). By controlling the rotation of the normal ratchet 17 as described above, the TE band 2 exerts the opening history indicating function.
The function of the normal ratchet 17 will be described later.

  Furthermore, the TE band 2 is connected to the lower end of the skirt portion 6 by an elongated strip-shaped strip 21 having a folded portion 21a. The strip 21 functions as a non-breakable connecting piece that does not break when the cap is opened, and when the cap body 1 is removed from the container mouth 50, the TE band 2 does not remain on the container mouth 50 side. It is a member for being removed together with the main body 1 from the container opening 50.

  The upper end of the TE band 2 and the lower end of the skirt portion 6 are connected by a narrow bridge 23. The narrow bridge 23 functions as a breakable connecting piece that breaks when the cap is opened, and the TE band 2 is provided when the cap is supplied or when the cap body 1 is attached to the container mouth 50 (capping). Is provided in order to be stably attached to the container mouth 50 together with the cap body 1 without being deformed.

  Further, a rib 25 for adjusting the gap with the TE band 2 is formed in an arc shape on the lower end surface of the skirt portion 6 except for the portion where the strip 21 is located. That is, by forming such ribs 25, the ribs 25 face the inner flange 2a at the upper end of the TE band 2, and the gap between the TE band 2 and the skirt portion 6 is narrowed, so that the cap can be attached to the shaft. It is possible to relieve the stress when a directional load is applied, and to avoid the breakage of the narrow bridge 23 or the strip 21 described above.

  By the way, the TE band 2 is divided by the vertical slits 30 extending in the vertical direction, and divided sections 30a and 30b facing each other are formed. That is, referring to FIGS. 3 and 4, this cap is swung in the direction indicated by X when the cap is opened and swung in the direction indicated by Y when the cap is closed. The TE band 2 is divided into an opening side portion α located on the opening direction X side and a closing side portion β located on the closing direction Y side. Further, the strip 21 is connected to the opening side α of the TE band 2.

In addition, as shown in FIGS. 3 and 4, in this example, the slits 30 are formed at two symmetrical positions, and the TE band 2 is formed by the slits 30 so that the opening side α and the closing side are formed. A plurality of normal ratchets 17 and dummy ratchets 60 are formed on each of the TE bands 2 divided by the slit 30.
In the TE band 2 having such dividing planes 30a and 30b and having the normal ratchet 17 on the inner surface thereof, in the present invention, in the vicinity of the dividing planes 30a and 30b (slits 30) on the side of the opening direction X. Further, a dummy ratchet 60 is provided. Like the normal ratchet 17, the dummy ratchet 60 is a convex portion that extends in the axial direction from the inner peripheral surface of the TE band 2 so as to be continuous with the lower surface of the inner flange 2a, but its height is the normal ratchet. It is lower than 17 and has a chevron-shaped flat cross-sectional shape, and is formed in such a manner that when the cap is opened and closed, the engaging projection 53 provided on the outer surface of the container mouth can be overcome. The number of dummy ratchets 60 in each of the divided portions in FIGS. 3, 4 and 7 is one, and the formation angle range (θ ₁ ) of the dummy ratchets 60 extending in the circumferential direction is 20 degrees, and the divided cross section is also divided. The angle (θ ₂ ) on the X side in the opening direction from the points 30a and 30b to the point where the dummy ratchet 17 projects most is disposed at 25 degrees.
The function of the dummy ratchet 60 will be described later.

  Further, the dividing surfaces 30a, 30b formed by the slit 30 are connected to each other by a bridge 31 (31a, 31b) that breaks when the stopper is opened.

  In the cap having the above structure, when the cap body 1 (skirt portion 6) attached to the container opening 50 is rotated in the opening direction X side to open the cap, one of the divided portions of the TE band 2 is opened. The plug side portion α is pulled by the strip 21 and moves in the opening direction X, but the stopper side portion β of the other divided portion divided by the slit 30 is controlled by the ratchet 17 to control the opening direction. The movement toward the X side is restricted, and as a result, the bridges 31a and 31b are broken and the TE band 2 is divided into the opening side α and the closing side β, whereby TE property is exhibited.

  In addition, it is preferable that the strip 21 is provided long so that the folded-back portion 21a is formed. That is, as shown in FIG. 1, the joint between the strip 21 and the skirt portion 6 and the joint between the strip 21 and the TE band 2 are located near the slit 30 that divides the TE band 2 and at the same time. The length of the strip 21 is preferably set to be much longer than the distance between the lower end of the skirt portion 6 and the upper surface of the TE band 2, and the folded portion 21a is formed on the strip 21. By forming such a folded-back portion 21a in the strip 21, once the TE band 2 is completely opened and the TE band 2 is completely divided, the TE band 2 can be returned to a state close to the state before the division. This is because, as a result, excellent TE property can be exhibited at the time of resealing.

Referring to FIG. 6 showing the process of opening the screw cap, when the cap body 1 in which the cap body 1 is attached to the container mouth 50 is rotated in the opening direction, the cap body 1 rises. However, as shown in FIG. 4, one of the plurality of normal ratchets 17 engages with the engagement protrusion 53 of the container mouth 50, and the rotation of the TE band 2 is suppressed. In this case, since the above-mentioned dummy ratchet 60 rides over the engagement protrusion 53, it does not have a function of suppressing the rotation of the TE band 2.
When any of the normal ratchets 17 engages with the engagement protrusion 53 and acts to prevent this rotation, the distance between the skirt portion 6 and the TE band 2 gradually increases, and the strip 21 is folded back. The portion 21a gradually extends, and the narrow bridge 23 described above breaks (FIG. 6A).

  Further, when the cap body 1 is rotated in the opening direction, the strip 21 is in a fully extended state, whereby the opening side α of one of the divided parts of the TE band 2 is opened by the strip 21 in the opening direction. It will be pulled to the X side (FIG. 6 (b)).

  Subsequently, when the cap body 1 is further rotated in the opening direction, the cap body 1 is further raised, and the opening side α of one of the divided portions of the TE band 2 is pulled by the strip 21 in the opening direction X side. However, the closing side β of the other split portion of the TE band 2 is restricted in its turning by the engagement with the normal ratchet 17 described above, so that the dividing surfaces 30a and 30b are connected to each other. Stress concentrates on the existing bridges 31a and 31b, the bridges 31a and 31b are broken, and the TE band 2 is divided (FIG. 6C). That is, the divided TE bands 2 are connected by the hanging strip 21, and the consumer can clearly recognize that the TE band 2 has been opened once.

  As can be seen from the above opening process, the length of the strip 21 is very long, and after opening the very long hanging strip 21 has the severed TE band 2 hanging down. . Therefore, it is very difficult to return it to its original shape, and when it is used for resealing, the strip 21 will have a considerably distorted form, and therefore, a general consumer can use the cap once opened. You can easily recognize the fact that there is. In particular, when the cap is small, the diameter of the TE band 2 is considerably small, so that the division of the TE band 2 is very likely to be overlooked. However, by setting the length of the strip 21 to be long, the resealing is The distortion is so large that it does not return to the state before opening shown in FIG. 6A, so that it can be easily recognized by general consumers and excellent TE property can be secured.

  As shown in FIGS. 1 and 6, in the screw cap having the above-described structure, the lower end of the skirt portion 6 of the cap body 1 and the upper end portion of the TE band 2 (the upper surface of the inner flange 2a) are It is preferable to provide guide protrusions 35a and 35b which are engaged with each other when opening or closing. That is, each of the protrusions 35a and 35b has an upright surface and an inclined surface, and when the cap is closed when the cap is attached to the mouth portion of the container, the upright surfaces abut and engage with each other, and the cap body 1 The rotation of the (skirt portion 6) in the closing direction is transmitted to the TE band 2, and the inclined surfaces come into contact with each other in the initial stage when the cap is opened, and the TE band 2 is rotated by the rotation of the cap body 1. It will be pushed down. As a result, the strip 21 can be closed and opened without applying an excessive load to the strip 21.

  Further, in the above-described screw cap, as shown in FIG. 1, a notch 37 that allows the folded portion 21a of the strip 21 is provided on the upper surface of the plugging side portion β divided by the slit 30. Preferably. This makes it possible to effectively avoid the inconvenience of having to increase the distance between the skirt portion 6 and the TE band 2 due to the formation of the long strip 21.

  By the way, in the screw cap having the structure including the TE band 2 of the split type as described above, since the folded portion 21a is provided when the cap is opened, tension is not applied to the strip 21 at a stretch, In the strip 21, the folded-back portion 21a is gradually extended and the tension is gradually applied. That is, the folded-back portion 21a becomes a play to relieve the tension. Therefore, with the screw cap having such a structure, it is ideal that the inconvenience that the strip 21 is broken when the cap is opened, that is, the inconvenience that the TE band 2 remains on the container side is effectively prevented.

However, generally speaking, when the normal ratchet 17 provided on the inner surface of the TE band 2 and the engagement projection 53 on the outer surface of the container mouth are engaged to prevent the TE band 2 from rotating in the opening direction, It is necessary to increase the number of normal ratchets 17.
That is, in the TE band 2 of this type, in the portion where the normal ratchet 17 is not formed, the distance between the inner surface of the TE band 2 and the outer surface of the container mouth portion 50 is increased by the height of the normal ratchet 17. Therefore, the gap portion is easily deformed by the external pressure. As a result, when the number of the normal ratchets 17 is small and the distance between the adjacent normal ratchets 17 is large, the deformation preventing function of the normal ratchets 17 is not sufficiently exerted, and when the TE band 2 is strongly gripped, the TE band 2 becomes large. When the TE band 2 is deformed and swung in the opening direction as it is, the TE band is not divided, and the cap body 1 and the TE band 2 are still connected to each other, and the cap body 1 is connected to the container mouth portion. The TE band 2 is detached from the TE band 2 (in short, the TE band 2 is pulled out at the bottom), and can be attached to the container mouth section 50 again. The function will be greatly impaired.
Therefore, in such a split type TE band 2, it is usually desirable to provide as many normal ratchets 17 as possible and to reduce the distance between the normal ratchets 17 so that the normal ratchets 17 sufficiently exhibit the deformation preventing function. That is why.

  However, as the number of normal ratchets 17 is increased, the normal ratchets 17 are formed at positions closer to the opening direction X side of the above-mentioned dividing surfaces 30a and 30b (slits 30). When the normal ratchet 17 (indicated by 17a in FIGS. 3 and 4) formed at a position close to the opening direction X side of the dividing surfaces 30a and 30b is engaged with the engagement protrusion 53, Since the distance between the normal ratchet 17a and the dividing planes 30a and 30b is short, the stress applied to the breaking bridge 31 (31a, 31b) connecting the dividing planes 30a and 30b is small, and as a result, the breaking bridge is broken. The strip 31 does not break, and the strip 21 extends as the plug is opened, and the strip 21 eventually breaks.

In the present invention, such an inconvenience is effectively prevented by providing the dummy ratchet 60 between the dividing surfaces 30a and 30b and the normal ratchet 17a.
That is, referring to FIG. 7 showing the function of the dummy ratchet 60, when the dummy ratchet 60 comes into contact with the engaging projection 53 on the outer surface of the container mouth portion when opening the stopper, the dummy ratchet 60 gets over the engaging projection 53. The dummy ratchet 60 does not prevent the TE band 2 from rotating in the opening direction X, which is a big difference from the normal ratchet 17. As can be understood from this, although the dummy ratchet 60 is formed at a position close to the dividing surface 30a, 30b on the side in the opening direction X, the dummy ratchet 60 prevents the fracture of the fracture bridge 31. It will not be done.

  In addition, provision of such a dummy ratchet 60 means that a plurality of normal ratchets 17 are provided on the opening direction X side with respect to the dummy ratchet 60. That is, even with the normal ratchet 17a existing at the position closest to the opening direction X side of the dividing planes 30a and 30b, the dummy ratchet 60 is formed between the normal ratchet 17a and the dividing planes 30a and 30b. Therefore, even if the number of normal ratchets 17 is increased, an appropriate space is maintained between the normal ratchet 17a closest to the dividing planes 30a, 30b and the dividing planes 30a, 30b, and the normal ratchet 17a is Even when it comes into contact with the engagement protrusion 53, stress is effectively applied to the breaking bridge 31, causing the breaking bridge 31 to break, so that the cap body 1 can be removed together with the TE band 2 without breaking the strip 21.

  Further, since a proper distance is maintained between the normal ratchet 17a closest to the dividing planes 30a and 30b and the dividing planes 30a and 30b, there is a concern that the deformation resistance to external pressure at this portion may be reduced. Since the dummy ratchet 60 is present in the portion, the deterioration of the deformation resistance is effectively prevented.

  Therefore, in the present invention, the number of normal ratchets 17 can be effectively prevented by increasing the number of normal ratchets 17 to prevent the TE band 2 from slipping out when the TE band 2 is strongly gripped and deformed. The breakage of the strip 21 at the time of opening the stopper due to the increase can be effectively prevented.

In the present invention, the number of normal ratchets 17 may be set to a number that can effectively prevent the TE band 2 from slipping off according to the diameter of the cap (the diameter of the TE band 2) and the like. The number of normal ratchets 17 per divided part of the TE band 2 is preferably 3 or more, particularly 4 or more. For example, the number of normal ratchets 17 in each of the divided portions in FIGS. 3, 4, and 7 is four.
Further, the range of the formation angle (θ ₃ ) of one normal ratchet 17 extending in the circumferential direction varies depending on the total number and the diameter of the cap and cannot be unconditionally specified, but the function of one normal ratchet In order to be sufficiently exerted, a small diameter cap applied to a spout such as a spout is not particularly limited, but normally the angle (θ ₃ ) is preferably about 10 to 30 degrees. From the same viewpoint, the interval (angle range θ ₄ ) between adjacent normal ratchets 17 is preferably about 15 to 35 degrees. Incidentally, in FIGS. 3, 4 and 7, the angle θ ₃ is 20 degrees and the angle θ ₄ is 25 degrees.

The total number of dummy ratchets 60 and normal ratchets 17 per divided portion of the TE band 2 is preferably four or more. The number of divided parts in FIGS. 3, 4, and 7 is one dummy ratchet 60, four normal ratchets 17, and a total of five dummy ratchets 17.
Further, since the dummy ratchet 60 is designed to ride over the engagement projection 53 when the plug is opened, as long as it is provided between the normal ratchet 17a closest to the dividing planes 30a and 30b and the dividing planes 30a and 30b. , Can also be provided in other parts. For example, it may be provided between the normal ratchets 17 adjacent to each other, and further, a dummy may be provided between the normal ratchet 17 and the dividing planes 30a, 30b located on the Y side in the closing direction Y with respect to the dividing planes 30a, 30b. It is also possible to provide a ratchet 60.
In order to fully exert the function of the dummy ratchet 17, it is preferable that the formation angle range (θ ₁ ) of the dummy ratchet 60 is set to about 10 to 30 degrees. , 30b to the point where the dummy ratchet 17 is most projected, the angle (θ ₂ ) on the X side in the opening direction is preferably within 45 degrees, and particularly within 35 degrees. Incidentally, in the examples of FIGS. 3, 4, and 7, the angle θ ₁ is 20 degrees and the angle θ ₂ is 25 degrees, as described above.

  Further, in the present invention, two vertical slits 30 are provided in the example of the drawing, and the TE band 2 is formed with two sets of sectional surfaces 30a and 30b, which are divided into two. It is possible to provide three or four slits 30 and divide each into the opening side α and the closing side β, but the number of slits 30 is not limited to two. It is possible to provide more than one or two, and each of the TE bands 2 divided by the plurality of slits 30 is provided with the above-mentioned normal ratchet 17 and dummy ratchet 60, and further corresponds to each slit 30. Then, the strip 21 is provided.

  Further, in the above-described example, the strip 21 having the folded portion is used as the non-breaking connecting piece that connects the TE band 2 and the cap body 1, but, of course, a strip 21 having no such folded portion is used. It is also possible to use it as a non-breaking connecting piece. However, when the one having the folded portion is used as the non-breaking connecting piece, such connecting piece is likely to cause the breaking when the number of the normal ratchet 17 is most increased, and thus the breaking can be prevented. The invention is most effective in the mode in which the strip 21 having the folded portion is used as the non-breaking connecting piece.

Further, in the present invention, as shown in FIG. 1 and the like, the slit 30 has a shape including a curved line instead of a straight line, and one of the dividing planes 30a has a curved shape which is recessed with the axial line Z as a reference. It is desirable to form a curved portion (curved concave portion) and a curved convex portion that protrudes on the other divided surface 30b with the axial line Z as a reference. Such a form is described in detail in Patent Document 4. That is, the dividing surfaces 30a and 30b of such a form are connected by the fracture bridges 31a and 31b, and the residue when the bridges 31a and 31b are fractured is left on the dividing surface 30a side which is the curved concave portion, It is preferable to set the shapes of the bridges 31a and 31b, specifically, to make the cross section 30a side of the bridges 31a and 31b thin. Thereby, when the bridges 31a and 31b are broken, it is possible to effectively prevent hand-cutting due to a breakage residue.
Of course, the number of such fracture bridges 31a and 31b is not limited to two, and may be one or three or more as long as the bridge fracture is effectively performed.

  The above-mentioned screw cap of the present invention is most suitable for mounting a ratchet type screw cap on the mouth part of a small diameter container such as a spout provided as a mouth part in a bag-shaped container (pouch). The cap is not limited to such a spout cap, and can also be suitably used as a cap used at the mouth of a container such as a bottle.

1: Cap body 2: TE band 17: Normal ratchet (normal ratchet)
21: Non-breakable connecting piece (strip)
23: Breakable connection piece 30: Vertical slits 30a, 30b: Divided section 31a, 31b: Breaking bridge 50: Container mouth 53: Projection 60: Dummy ratchet (projection)

Claims (6)

The cap main body is fixed to the container opening by screw engagement, and the opening history indicating band having a tubular shape and connected to the lower end of the skirt of the cap main body by a non-breaking connecting piece. In the screw cap, the band is divided in the circumferential direction by at least one sectional surface extending in the vertical direction, and the sectional surface is connected by a breakable bridge that can be broken when the cap is opened.
The inner surface of the opening history indicating band having the above-mentioned cross section has an engagement protrusion formed on the outer surface of the container opening so as to prevent rotation in the cap opening direction but allow rotation in the cap opening direction. A plurality of ratchets that can be engaged are provided,
On the inner surface of the band, at least one convex portion capable of overcoming the engaging projection at the time of opening and closing the stopper is provided at a portion located on the opening direction side with respect to the sectional surface, and the plurality of ratchets are provided. Are all formed on the side in the opening direction with respect to the convex portion.   The screw cap according to claim 1, wherein the convex portion is provided within an angle range of 45 degrees or less from the dividing surface on the side in the opening direction.   The screw cap according to claim 1, wherein the protrusion has a lower protruding height from the inner surface of the band than the ratchet.   A plurality of the dividing planes are formed, the band is multi-divided by the dividing planes, and the convex portion and the plurality of ratchets are formed for each of the divided portions of the band divided by the dividing planes. The screw cap according to any one of claims 1 to 3.   The screw cap according to claim 4, wherein a total of four or more of the convex portions and the ratchet are provided on the inner surface of the TE band for each divided portion of the band.   The screw cap according to claim 1, wherein the non-breakable connecting piece is a strip having a folded portion.