JP2009083925A - Bottle cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bottle cap which can retain the bottom lid of the inner tube at the outer tube so that the bottom lid does not fall into a bottle after a raw material is filled into the inner tube with the lower end opening of the inner tube sealed, a child cap assembled with a parent cap, and the bottom lid separated from the inner tube, and also which improves sealability of the bottom lid. <P>SOLUTION: The bottom lid 3 closes the lower end opening of the inner tube 9 of the child cap 2 by screwing a screw 3e and 9a formed at those and the inner tube 9 is inserted into the outer tube 6 with the bottom lid 3 in the lead till the bottom lid 3 passes the lower end of the outer tube 6 of the parent cap 1. In the process of rotating the child cap 2 in the opening direction, rotation of the bottom lid 3 is prevented by engaging a bottom lid opening tooth 3f of the bottom lid 3 with the bottom lid opening tooth 6i of the outer tube 6 and screwing of each screw is released to separate the bottom lid 3 from the inner tube 9. The separated bottom lid 3 is held on the outer tube 6 with a bottom lid holding ring 3x provided on the bottom lid in one piece. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bottle cap that has a raw material container that contains a powdery or liquid raw material, and that releases the raw material into a bottle by dropping the bottom cover of the raw material container in accordance with the opening operation.

The inventor has already provided the bottle caps disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2004-106888) and Patent Document 2 (Japanese Patent Laid-Open No. 2005-88997).
The bottle caps described in these are: a parent cap having an outer cylinder to be inserted into the mouth of the bottle; a child cap having an inner cylinder to be inserted into the outer cylinder and serving as a raw material storage; and a lower end of the inner cylinder It consists of a bottom lid that seals the opening, covers the cap body of the parent cap over the mouth of the bottle and tightens it, and by screwing the child cap onto the outer cylinder of the parent cap, the upper end opening of this outer cylinder In addition, the bottle mouth can be sealed, and by rotating the child cap in the opening direction with respect to the outer cylinder of the parent cap, the bottom lid is removed from the inner cylinder by the lower end of the outer cylinder of the parent cap. The raw material is released into the bottle.

In the conventional bottle cap, when sealing the lower end opening of the inner cylinder with the bottom lid, the annular recess formed in the bottom lid is closely fitted to the lower end portion of the inner cylinder so as to maintain the sealing performance. It has become.
However, in such fitting, there is a limit to improving the sealing performance no matter how much the contact pressure between the inner cylinder and the bottom lid is increased.

  In the conventional bottle cap, the parent cap, the child cap, and the bottom cover are assembled by inserting the inner cylinder of the child cap into the outer cylinder of the parent cap, screwing the child cap into the outer cylinder of the parent cap, Screw the child cap onto the parent cap until the lower end opening of the cylinder protrudes from the lower end opening of the outer cylinder, that is, after completely assembling the parent cap and child cap, into the inner cylinder which is the raw material storage part The raw material (powder or granule) is filled, and then the lower end opening of the inner cylinder is sealed with a bottom lid. Thereafter, the cap main body of the parent cap is screwed into the bottle mouth portion, the inner cylinder is inserted into the bottle mouth portion together with a part of the outer cylinder, and the bottle cap is attached to the bottle mouth portion.

  However, in such an assembly structure, the parent cap and the child cap must be fully assembled as described above before filling the raw material in the inner cylinder and sealing the lower end opening with the bottom cover. In addition, the assembly is troublesome, the mechanism of the automatic assembly apparatus is complicated, the equipment is expensive, and the time required for the assembly is increased. In addition, when filling the raw material into the inner cylinder, the raw material not only adheres to the outer surface of the inner cylinder, but also adheres to the outer surface of the outer cylinder, and further penetrates between the inner cylinder and the outer cylinder, From this point of view, there is a problem that sufficient cleaning cannot be performed when the bottle cap is cleaned after the raw material is filled.

Further, in the bottle cap described in Patent Document 2, the cap body of the parent cap is screwed into the bottle mouth until it exceeds the lock protrusion on the outer periphery of the bottle mouth, but the cap body of the parent cap is gripped. If you try to forcibly remove it from the bottle mouth while turning the parent cap, you cannot remove it. When the parent cap is removed from the bottle mouth portion, the bottle mouth portion is completely opened, and there is a risk that the bottom lid that has fallen into the bottle may come out of the bottle mouth portion and accidentally ingest the bottom lid.
JP 2004-106888 A JP 2005-88997 A

  The first problem of the present invention is that the bottom cover is sealed to the lower end opening of the inner cylinder by screwing the screws together, and even in such a case, the bottom cover is attached to the inner cylinder. An object of the present invention is to enable opening of the inner cylinder, which must be performed by separating from the lower end, with a simple structure.

  The second problem of the present invention is that after the raw material is filled in the inner cylinder of the child cap and the lower end opening is sealed with the bottom cover, the child cap can be assembled with the parent cap. The assembly of the three parts of the lid is easy, the mechanism of the automatic assembly device can be simplified, the equipment cost and running cost can be reduced, the assembly time can be shortened, and the ease of cleaning and elimination of cleaning unevenness can be reduced. Also, the cleaning device can be simplified.

  In addition to this, the third problem of the present invention is to enable the bottom lid after separation from the inner cylinder to be held on the outer cylinder so as not to fall into the bottle.

  Furthermore, the fourth problem of the present invention is that the parent cap is detached from the bottle mouth portion and the bottle mouth portion is removed by making the structure incapable of forcibly removing it from the bottle mouth portion while turning the parent cap. The purpose is to avoid a situation where the bottle is completely opened and to prevent the bottom lid from coming out of the bottle mouth.

In order to achieve the first to third problems, the present invention according to claim 1 has an outer cylinder, and a parent cap that is inserted into the mouth of the bottle and fixed to the mouth. And an inner cylinder that is inserted into the outer cylinder and serves as a raw material storage section, a child cap that opens and closes the upper end opening of the outer cylinder together with the mouth of the bottle, and a bottom lid that seals the lower end opening of the inner cylinder In the bottle cap in which the bottom lid is separated from the inner cylinder by turning the child cap in the opening direction, and the raw material in the inner cylinder is discharged into the bottle,
The bottom lid seals the lower end openings of the inner cylinder by screwing the screws formed on them, and the bottom lid opens the bottom lid opening part of the outer cylinder with the bottom lid after the sealing being the top. The inner cylinder is inserted into the outer cylinder to the extent that it exceeds, and the bottom lid opening teeth that engage with each other are formed on the bottom lid and the bottom lid opening portion of the outer cylinder. When the bottom lid opening teeth of the lid mesh with the bottom lid opening teeth of the outer cylinder, the rotation of the bottom lid is prevented, and the screws of the bottom lid and the inner cylinder are unscrewed so that the bottom lid is removed from the inner cylinder. In addition to being separated, bottom lid fall prevention means for holding the separated bottom lid on the outer cylinder and preventing it from falling into the bottle is provided.

  The invention according to claim 2 is characterized by a specific form of the bottom lid opening structure for opening the bottom lid in the process of turning the child cap in the opening direction, and the bottom lid opening tooth of the outer cylinder is the lower end of the outer cylinder. The bottom lid opening teeth of the edge and the bottom lid are formed on the upper peripheral edge of the bottom lid, and the inner cylinder is inserted into the outer cylinder until the bottom lid exceeds the lower end of the outer cylinder and comes out of the outer cylinder.

  The invention according to claim 3 is characterized in a preferred specific form of the bottom lid fall prevention means, wherein the bottom lid fall prevention means is a bottom lid holding ring fitted to the outer cylinder, and is connected via an elastic connecting portion. The bottom cover separated from the inner cylinder is held on the outer cylinder by being integrally provided on the bottom lid and engaging with a stopper portion provided on the outer cylinder.

  The invention according to claim 4 is characterized in another aspect of the bottom lid fall prevention means, wherein the bottom lid fall prevention means is a bottom lid coupling piece having elasticity that is integrally suspended from the outer cylinder, and this bottom lid coupling means. By connecting the joint portions formed on the piece and the bottom lid and connecting the bottom lid to the outer cylinder via the bottom lid connecting piece, the bottom lid separated from the inner cylinder is held on the outer cylinder. .

  In the invention according to claim 5, since the inner cylinder is inserted into the outer cylinder with the bottom lid after sealing the lower end opening of the inner cylinder, in order to facilitate the insertion, the bottom lid is press-fitted. A slit that allows elastic deformation of the outer cylinder is formed in the outer cylinder.

  The invention according to claim 6 is characterized by yet another aspect of the bottom lid drop prevention means, wherein the bottom lid opening portion is formed in an annular shape in the outer cylinder, and the bottom lid fall prevention means is located below the bottom lid opening portion. A bottom lid separated from the inner cylinder is accommodated in the bowl-shaped part integrally formed with the outer cylinder on the side, and is prevented from falling.

  In the invention according to claim 7, in order to further improve the sealing performance of the bottom cover, the lower end portion of the inner cylinder is fitted into an annular groove formed in the bottom cover, and the mutual screws formed in the fitting portion. Are screwed together so that the bottom lid seals the lower end opening of the inner cylinder.

  In the invention according to claim 8, in order to achieve the fourth problem as well, the parent cap has a cap body that covers the mouth of the bottle, and the upper portion of the outer cylinder protrudes upward from the cap body so that the outer cylinder A male screw that is screwed with the female screw of the child cap is formed in the mouth, and the inner peripheral surface of the cap main body is engaged with the male screw of the bottle mouth to tighten the cap main body. A protrusion is formed on the lower side away from the tightening protrusion, and the distance is determined by engaging the tightening protrusion with the male screw at the mouth of the bottle. When the cap body is tightened, the locking protrusion is forced over the locking collar formed on the outer peripheral surface of the mouth of the bottle below the male screw and is positioned below it. The protrusion is a male mouth of the bottle Flip be loosened cap body until it disengages from the upper end of stopper projections missing characterized in that the distance to maintain the state of being positioned below the locking flange portion.

The invention according to claim 1 has the following effects.
(1) Since the bottom lid is a screw lid that seals the lower end opening of the inner cylinder by screwing together, the sealing performance is high. If the bottom lid is a screw lid, the bottom lid and the inner cylinder cannot be opened without separating the bottom lid and the inner cylinder, but the bottom lid opening teeth that mesh with the bottom lid and the outer cylinder cannot be opened. In the process of forming and turning the child cap, the bottom lid opening teeth of the bottom lid mesh with the bottom lid opening teeth of the outer cylinder, so that the rotation of the bottom lid is prevented, and the bottom lid and the inner cylinder Since the screw can be unscrewed, the bottom cap can be opened at the same time as the child cap is opened, without adding parts or using a special structure.
(2) Filling the inner cylinder of the child cap with the raw material, sealing the lower end opening with the bottom lid, and then inserting the inner cylinder into the outer cylinder with the bottom lid at the top, Since the bottom cover can be automatically separated from the inner cylinder, it is easy to assemble the three parts of the parent cap, the child cap and the bottom cover, the mechanism of the automatic assembly apparatus can be simplified, and the equipment cost In addition, the running cost can be reduced and the assembly time can be shortened. Moreover, since the raw cap is filled in the inner cylinder of the child cap before the child cap is combined with the parent cap, and the lower end opening can be sealed with the bottom lid, the cleaning in such a state is as conventional. Compared with the case where the child cap is combined with the parent cap and the raw material is filled and the bottom lid is sealed, the cleaning unevenness can be eliminated and the cleaning device can be simplified.
(3) Since the bottom lid separated from the inner cylinder of the child cap is held on the outer cylinder of the parent cap and prevented from falling into the bottle, accidental swallowing of the bottom lid can be prevented, and at the time of disposal If the parent cap is removed from the bottle, the bottom lid does not remain in the bottle, so that the bottom lid does not interfere with the bottle recycling process.

  According to the second aspect of the present invention, when the child cap is opened, the inner lid is inserted into the outer cylinder until the bottom lid exceeds the lower end of the outer cylinder and comes out of the outer cylinder. Since the formed bottom lid opening tooth meshes with the bottom lid opening tooth formed at the lower end edge of the outer cylinder and the bottom lid is separated from the inner cylinder, the bottom lid can be easily and reliably separated.

  According to the third aspect of the present invention, the bottom cover separated from the inner cylinder is held in the outer cylinder by the bottom cover holding ring provided integrally with the bottom cover via the elastic connecting portion. Can be completed simultaneously with the assembly of the child cap and the parent cap.

  According to the fourth aspect of the present invention, the bottom cover separated from the inner cylinder is elasticized by connecting the joints of the bottom cover connecting piece and the bottom cover, which are integrally suspended from the outer cylinder, to each other. Since the bottom cover connecting piece having the shape holds the outer cylinder, the holding structure is simple, and molding and assembly are easy.

  According to the invention of claim 5, the outer cylinder is elastically deformed and pushed open as the bottom lid is pressed, so the inner cylinder is removed from the bottom lid after sealing the lower end opening of the inner cylinder. When the child cap and the parent cap are assembled by being inserted into the cylinder, the assembly is easy.

  According to the sixth aspect of the invention, the bottom lid separated from the inner cylinder is accommodated in the bowl-shaped portion formed integrally with the outer cylinder to prevent the fall, so that the bottom lid can be reliably dropped into the bottle. Can be prevented.

  According to the seventh aspect of the present invention, the lower end portion of the inner cylinder is fitted in the annular concave groove formed in the bottom cover in the same manner as in the prior art, and the screw formed in the fitting portion is screwed together. Since the bottom lid seals the lower end opening of the inner cylinder, the sealing performance is further enhanced.

  According to the eighth aspect of the present invention, the cap main body portion of the parent cap is placed on the bottle mouth portion, and the tightening protrusion formed on the inner peripheral surface of the cap main body portion is engaged with the male screw of the bottle mouth portion and rotated. When tightened while tightening, the retaining protrusion formed on the inner peripheral surface of the cap main body forcibly gets over the locking collar of the bottle mouth and is positioned below it. If you try to remove the parent cap from the bottle mouth and loosen the cap body until the tightening protrusion is removed from the upper end of the male screw on the bottle mouth, the parent cap will idle relative to the bottle mouth. The retaining protrusion is located below the locking collar, and in order to remove the parent cap from this state, the pulling force is sufficient for the retaining protrusion to climb over the locking collar. This is not possible without forcing the parent cap. Therefore, if the force required for pulling out is strengthened to such an extent that it is impossible by finger force alone, there is no fear of forcibly opening the parent cap and accidentally swallowing the bottom cover.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the bottle cap according to the first embodiment includes a parent cap 1, a child cap 2, and a bottom lid 3 that are resin-molded. 8 to 12 show the relationship between these three parts in an enlarged sectional view.

  The parent cap 1 is made of polyethylene terephthalate in the same manner as a polyethylene terephthalate PET bottle 50 (shown by a chain line in FIGS. 10 to 12; hereinafter referred to as a bottle). Is integrally provided with an open outer cylinder 6. The outer cylinder 6 integrally penetrates the top part 5a of the cap body part 5 vertically, and the upper part protruding upward from the top part 5a becomes a mouth part 6a whose upper end is open, and protrudes downward from the top part 5a. The lower part is a hanging cylinder part 6b that hangs downward from the lower end thereof and opens at the lower end while forming a gap 5c with the body part 5b of the cap body part 5. As shown in FIG. 5, two or more vertically long slits 6c reaching from the middle to the lower end are formed at equal intervals in the drooping cylinder portion 6b, and the drooping cylinder portion 6b extends from the upper end portion of the slit 6c toward the lower end. The inner diameter from the middle gradually becomes smaller than the outer diameter of the bottom lid 3. On the outer peripheral surface of the hanging cylinder portion 6b above the slit 6c, an annular sealing projection 6d is formed. Further, an annular tooth portion 5d having a sharp tip edge (lower edge) is integrally formed on the lower surface of the top portion 5a so as to protrude in the gap 5c.

  A male screw 6e is formed on the outer peripheral surface of the mouth portion 6a of the outer cylinder 6, and a child cap locking collar portion 6f is integrally provided between the terminal end and the top portion 5a. On the other hand, an annular bottom cover drop prevention stopper portion 6g is integrally formed on the inner periphery of the lower end of the drooping cylinder portion 6b of the outer cylinder 6, and the lower end opening of the drooping cylinder portion 6b is formed by this annular stopper portion 6g. 6h is small with a step. Further, the hanging cylinder portion 6b of the outer cylinder 6 is divided by a slit 6c, and a plurality of bottom lid opening teeth 6i are formed at intervals in the circumferential direction at the lower end edge thereof.

  The inner peripheral surface of the body portion 5b of the cap main body 5 is integrally formed with an annular retaining protrusion 5e that goes around the inner peripheral surface at the lower end thereof. On the upper side, an annular tightening projection 5f that also goes around the inner peripheral surface is formed integrally. Further, on the outer peripheral surface of the body part 5b of the cap body part 5, a reinforcing collar part 5g for increasing the thickness of the body part 5b outward is integrally formed with a lower end part opposite to the retaining protrusion part 5e. The knurl 5h is formed on the outer peripheral surface above the upper surface.

  The child cap 2 integrally hangs an inner cylinder 9 serving as a raw material and pressurized gas filling part (capsule) from the lower surface of the top part 8a of the cap body part 8, and is thin at a position close to the outer periphery of the inner cylinder 9. The short sealing ring 10 is integrally protruded downward from the top 8a. The inner cylinder 9 protrudes much longer than that while forming a gap 8 c between the inner body 9 and the body 8 b of the cap body 8.

  Thus, the inner cylinder 9 which is open only at the lower end has a smaller diameter than the outer cylinder 6 of the parent cap 1, and forms a gap 7 between the inner cylinder 9 and the outer cylinder 6 as shown in FIGS. 4, 10 and 11. However, the length is slightly longer than the outer cylinder 6. A spiral screw 9 a is formed on the outer peripheral surface of the lower end portion of the inner cylinder 9 so as to slightly exceed one turn.

  On the inner peripheral surface of the body portion 8b of the cap body portion 8, a female screw 8d that is screwed with the male screw 6e of the mouth portion 6a of the outer cylinder 6 is formed. On the other hand, an anti-slip knurl 8e is provided on the outer peripheral surface of the body portion 8b when the finger is put on the body 8b.

  Also, on the lower side of the body portion 8b of the cap body portion 8, a locking separation ring 11 is slightly connected to the body portion 8b by a bridge 8f which is a small connecting portion, so that the cap body portion 8 is integrated. It is resin molded. The cap body 8 and the locking separation ring 11 are separated when the bridge 8f is cut. On the inner peripheral surface of the locking separation ring 11, an annular separation projection 11 a that makes a round is integrally formed.

  Furthermore, a small concave portion 8g is provided at the lower peripheral edge of the body portion 8b of the child cap 2, and a small convex portion 11b is provided at a plurality of locations on the upper peripheral edge of the locking separating ring 11, and the concave portion 8g and the convex portion 11b are mutually connected. It is mated. It should be noted that the body 8b and the locking separation ring 11 may be integrally connected at the fitting portion so that the concave portion 8g and the convex portion 11b also serve as the bridge 8f.

  The bottom lid 3 is integrally formed of transparent polyethylene terephthalate as a whole, and as shown in FIGS. 1, 2, 6 and 7, a central convex portion 3a is formed to protrude from the center of the upper surface, and an inner peripheral wall 3b. An annular concave groove 3d is formed between the outer peripheral wall 3c and the outer peripheral wall 3c. Then, in this annular groove 3d, a spiral screw 3e is formed on the inner peripheral surface of the outer peripheral wall 3c so that it slightly exceeds one turn, and a plurality of bottom lid opening teeth 3f are provided on the upper end edge of the outer peripheral wall 3c. They are formed at intervals in the circumferential direction. A plurality of reinforcing ribs 3g are integrally formed between the central convex portion 3a and the inner peripheral wall 3b. The lower peripheral surface of the outer peripheral wall 3c is a tapered truncated cone surface.

  Further, the bottom lid 3 is integrally molded with a bottom lid holding ring 3x through a thin plate-like coupling portion 3y having elasticity. The connecting portion 3y can be bent, but has a restoring force to restore the extended state by its own elasticity. The bottom cover holding ring 3x is composed of a large ring portion 3xa and a small ring portion 3xb that is continuous in the axial direction. The outer diameter of the large ring portion 3xa is the inner diameter of the stopper 6g for preventing the bottom cover from falling off the outer cylinder 6. The outer diameter of the small ring portion 3xb is smaller than the inner diameter of the bottom lid drop prevention stopper portion 6g.

  One end of the connecting portion 3y is integrally continuous with the outer peripheral surface of the bottom lid 3, and the other end of the connecting portion 3y is integrally continuous with the outer peripheral surface of the small ring portion 3xb of the bottom lid holding ring 3x. The bottom lid 3 is formed with a relief recess 3z for the connecting portion 3y from the base portion of the connecting portion 3y to the upper edge of the bottom lid 3.

  On the other hand, as shown in FIGS. 11 and 12, a locking collar 50d is integrally formed on the outer peripheral surface of the mouth 50a of the bottle 50 between the male screw 50b and the reinforcing collar 50c. The upper surface of the locking collar portion 50d is a slope inclined with an arc, but the lower surface is a horizontal plane. Such a structure of the bottle mouth portion 50a is common to ordinary PET bottles regardless of the size of the bottle.

  In the bottle cap according to the first embodiment having such a configuration, the three parts of the parent cap 1, the child cap 2, and the bottom lid 3 are assembled as follows.

  The bottom cover holding ring 3x is fitted on the outer periphery of the inner cylinder 9 as shown in FIG. 2, and the raw material 12 is placed in the inner cylinder 9 of the child cap 2 in a pressure gas atmosphere such as nitrogen gas as shown in FIG. Then, the connecting portion 3y of the bottom lid 3 is bent and the screw 3e and 9a are screwed together while fitting the annular concave groove 3d of the bottom lid 3 to the lower end portion of the inner cylinder 9 of the child cap 2. Then, as shown in an enlarged view of the fitting state in FIG. 8, the lower end portion of the inner cylinder 9 is press-fitted into the annular concave groove 3d, and the screws 9a and 3e are screwed together. As a result, the lower end opening of the inner cylinder 9 is sealed with high sealing performance. The connecting portion 3 y of the bottom lid 3 is fitted into the relief recess 3 z on the outer peripheral surface of the bottom lid 3.

  In this way, the inner cylinder 9 of the child cap 2 is filled with the raw material 12 together with the pressure gas and sealed with the bottom lid 3 in advance, and then the bottom lid 3 is placed at the top as shown in FIGS. When the inner cylinder 9 is inserted into the outer cylinder 6 and the female screw 8d is screwed into the male screw 6e of the parent cap 1 while the child cap 2 is rotated, the bottom cover 3 is moved as shown in FIG. While sliding down the bottom lid drop prevention stopper 6g of the drooping cylinder portion 6b of the cylinder 6, it descends to the outside of the outer cylinder 6, and the lower half of the drooping cylinder portion 6b in which the slit 6e is formed is expanded from the inside. Elastically deform.

  When the inner cylinder 9 is further inserted into the outer cylinder 6, the bottom cover 3 further descends with the drooping cylinder portion 6 b expanded and elastically deformed, and protrudes from the lower end opening 6 h beyond the lower end of the outer cylinder 6. To do. At the same time, the drooping cylinder 6b is restored to its original size.

  When the female screw 8d of the child cap 2 is screwed to the male screw 6e of the parent cap 1 to the end, as shown in FIGS. 4 and 10, the bottom cover 3 is located at a position slightly away from the lower end outside the outer cylinder 6. In addition, the small ring portion 3xb of the bottom lid holding ring 3x is located in the lower end opening 6h formed on the inner periphery of the stopper portion 6g of the outer cylinder 6, and the large ring portion 3xa of the bottom lid holding ring 3x is It remains in the cylinder 6 and engages with the stopper part 6g on the upper side, and the connecting part 3y penetrates the inside and outside of the lower end opening 6h of the outer cylinder 6 in a state of being fitted into the relief recess 3z of the bottom cover 3.

  In addition, the separation protrusion 11a on the inner peripheral surface of the lock separation ring 11 of the child cap 2 is positioned in the immediate vicinity of the lower side of the child cap lock 6f forcibly beyond the child cap locking collar portion 6f of the parent cap 1. 2 is locked to the parent cap 1. Further, the top portion 8a of the child cap 2 is pressed against the upper end of the outer cylinder 6, and the sealing ring 10 is press-fitted into the mouth portion 6a of the outer cylinder 6, so that the outer cylinder is joined with the corner portion of the trunk portion 8b of the child cap 2. The 6 mouth portions 6a are sandwiched from inside and outside, and the mouth portion 6a of the outer cylinder 6 is sealed with high sealing performance.

  When attaching the bottle cap of Example 1 assembled in this way to the mouth portion 50a of the bottle 50, the outer cylinder 6 is inserted into the bottle mouth portion 50a as shown in FIG. 10 and the parent cap 1 is closed. , The annular tightening protrusion 5f of the cap body 5 is engaged with the male screw 50b of the bottle mouth 50a and screwed, and the retaining protrusion 5e of the cap body 5 of the parent cap 1 is used as the bottle. The parent cap 1 is further rotated in the closing direction until the annular collar 5d of the cap main body 5 bites into the opening edge of the bottle mouth 50a, forcibly exceeding the locking collar 50d on the mouth 50a side. Then, the bottle mouth portion 50a is sealed. In this state, the sealing projection 6d on the outer peripheral surface of the outer cylinder 6 is also in pressure contact with the inner peripheral surface of the bottle mouth portion 50a, so that the parent cap 1 and the bottle mouth portion 50a are engaged with the pressure contact and the annular tooth portion 5d. And double sealed.

  On the other hand, the gap 7 formed between the inner cylinder 9 and the outer cylinder 6 has a slit 6 c formed in the hanging cylinder portion 6 b of the outer cylinder 6 and communicates with the inside of the bottle 50. It does not become a reservoir for the content liquid inside.

  To open the bottle cap, the child cap 2 is rotated in the opening direction with respect to the parent cap 1. Then, the child cap 2 is screwed upward with respect to the opening 6a of the outer cylinder 6 of the parent cap 1, but the locking separation ring 11 of the child cap 2 is for child cap locking on the parent cap 1 side. Since the rise is restricted by the flange 6f, as shown in FIG. 11, the bridge 8f, which is the connecting portion with the cap body 8, is cut to separate the locking separation ring 11, and the recess 8g and the protrusion 11b are further separated. The mating with is also released.

  When the child cap 2 is further rotated, as shown in the figure, the inner cylinder 9 also rises with the bottom cover 3 while rotating, so that the upper peripheral edge of the bottom cover 3 is the outer cylinder of the parent cap 1. 6, the bottom lid opening teeth 3 f and 6 i are engaged with each other. Although the inner cylinder 9 rises while rotating further, the bottom lid 3 cannot rotate with the inner cylinder 9 because the bottom lid opening teeth 3f and 6i are engaged with each other, and the inner cylinder 9 further rotates in this state. As it rises, the screw 3e of the bottom cover 3 and the screw 9a of the inner cylinder 9 are unscrewed, and the bottom cover 3 is detached from the inner cylinder 9 and separated as shown in FIG. When this is separated, the lower end opening of the inner cylinder 9 is opened, and the raw material 12 in the inner cylinder 9 is jetted into the bottle 50 together with the pressure gas. However, the bottom lid 3 has its bottom lid retaining ring 3x held down by the bottom lid drop prevention stopper 6g of the outer cylinder 6 so that the bottom lid retaining ring 3x does not sink into the bottle 50. The connecting portion 3y is suspended from the outer cylinder 6, and the connecting portion 3y is restored and extends, so that the inner cylinder 9 is kept open.

  As shown in FIG. 13, after the child cap 2 is removed from the parent cap 1, the parent cap 1 is tried to be removed from the bottle mouth portion 50a, and the parent cap 1 is rotated in a loosening direction with respect to the male screw 50b of the bottle mouth portion 50a. Then, the annular tightening protrusion 5f of the cap main body portion 5 of the parent cap 1 exceeds the upper end of the male screw 50b of the bottle mouth portion 50a, and the parent cap 1 idles with respect to the bottle mouth portion 50a. However, even in such a state, the retaining protrusion 5e of the cap body 5 is separated from the tightening protrusion 5f by a distance L, so that the locking collar 50d on the bottle mouth portion 50a side is separated. Even if the main cap 1 is left at the lower side and the parent cap 1 is forcibly pulled out from the bottle mouth portion 50a, the retaining cap 5e cannot get over the locking collar portion 50d, so that the parent cap 1 is prevented from being pulled out. Is done. The bottom lid 3 cannot come out of the bottle 50 as long as the parent cap 1 remains in the bottle mouth portion 50a.

  Although the parent cap 1 and the bottom lid 3 remain in the bottle 50, they are made of the same polyethylene terephthalate as the bottle 50, so that the bottle 50 and the plastic bottle can be recycled.

  A reinforcing collar 5g is formed on the outer surface of the cap main body 5 opposite to the retaining protrusion 5e, and the wall thickness is increased on the outer side. It is impossible at all.

Although the tightening projection 5f that meshes with the male screw 50b of the bottle mouth portion 50a and fastens the cap main body 5 of the parent cap 1 has an annular shape, it may be a screw (spiral).
Further, after the raw material 12 is put in the inner cylinder 9 of the child cap 2 and sealed with the bottom lid 3, the inner cylinder 9 is inserted into the outer cylinder 6 of the parent cap 1 with the bottom lid 3 at the top. After the child cap 2 and the parent cap 1 are assembled, the parent cap 1 is attached to the bottle 50. The parent cap 1 is first attached to the bottle 50, and then the child cap 2 is sealed with the bottom lid 3. May be assembled to the parent cap 1 in the same manner as described above.

Next, Example 2 shown in FIGS. 14 to 16 will be described.
The second embodiment is different from the first embodiment in the structure in which the bottom lid 3 after being separated from the inner cylinder 9 of the child cap 2 is held by the outer cylinder 6 of the parent cap 1, but is otherwise the same as the first embodiment. It is.

  In the second embodiment, an elastic long plate-like bottom lid connecting piece 6j is integrally suspended from a hanging cylinder portion 6b of the outer cylinder 6, and a joint having a neck portion and a head portion at the center of the bottom surface of the bottom lid 3. The protrusion 3h is integrally provided. The bottom cover connecting piece 6j is formed by making two cuts where the drooping cylinder portion 6b is present and integrally extending further downward than the lower end of the drooping cylinder portion 6b. A notch or recess 6k is formed in the base portion of the bottom cover connecting piece 6j so as to be easily bent, and a notch or recess 6l is formed in the intermediate portion so as to be easily bent toward the center of the outer cylinder 6. Has been. Moreover, as shown in FIG. 17, the joint hole 6m is formed in the front-end | tip part of the bottom cover connection piece 6j, and the notch 6n following the joint hole 6m is formed.

  Also in the case of the second embodiment, as in the case of the first embodiment, as shown in FIG. 14, the raw material 12 is filled together with the pressure gas in the inner tube 9 of the child cap 2 and sealed with the bottom lid 3 in advance. Then, by rotating the child cap 2 and screwing the female screw 8d with the male screw 6e of the parent cap 1, the inner tube 9 is moved into the outer tube 6 while the outer tube 6 is expanded with the bottom cover 3 at the head. In this case, in the case of the second embodiment, the bottom lid connecting piece 6j is bent into an L shape using a jig, for example. As shown in FIG. 15, the joint protrusion 3h of the bottom lid 3 is fitted into the joint hole 6m of the bottom lid coupling piece 6j, and the bottom lid 3 is coupled to the bottom lid coupling piece 6j.

  Also in the case of the second embodiment, when the child cap 2 is rotated in the opening direction with respect to the parent cap 1, the child cap 2 rises and the upper peripheral edge of the bottom cover 3 hits the lower end opening edge of the outer cylinder 6 of the parent cap 1. Since the bottom lid opening teeth 3f and 6i mesh with each other, the bottom lid 3 cannot rotate together with the inner cylinder 9, and the screw 3e of the bottom lid 3 and the screw 9a of the inner cylinder 9 are disengaged. As shown in FIG. 4, the bottom lid 3 is separated from the inner cylinder 9 and separated. In the case of the second embodiment, the separated bottom lid 3 is suspended from the outer cylinder 6 by the restored bottom lid coupling piece 6j. Will be held at.

  Even in the case of the second embodiment, the parent cap 1 is first attached to the bottle 50, and then the child cap 2 sealed with the bottom lid 3 is assembled to the parent cap 1 in the same manner as described above. Good.

Next, Example 3 shown in FIGS. 18 to 21 will be described.
As shown in FIG. 18, in the third embodiment, an annular bottom lid opening portion 6o is integrally formed in the middle of the inner peripheral surface of the outer cylinder 6 of the parent cap 1, and below the bottom lid opening portion 6o. The bottomless flange 6p is integrally formed. The inner peripheral surface of the bottom lid opening portion 6o is a conical surface whose inner diameter gradually decreases from the upper end toward the lower end, and bottom cover opening teeth 6i are formed on the lower end peripheral surface. The bowl-shaped portion 6p has a number of vertically long slits 6q formed in its body portion, and although it has no bottom, the bottom lid fall prevention stopper portion 6r having an inner diameter smaller than the outer diameter of the bottom cover 3 is provided at the lower end of the body portion. The inner periphery is formed in a ring shape. A stopper collar 6 s for the parent cap 1 itself is integrally formed on the outer peripheral edge of the upper end of the outer cylinder 6, and a seal projection 6 t is formed annularly in the middle of the outer peripheral surface of the outer cylinder 6. Yes.

  The bottom lid 3 in the third embodiment has a structure in which the bottom lid retaining ring 3x and the connecting portion 3y in the first embodiment are omitted from the bottom lid 3.

  In the case of Example 3, after the raw material 12 is filled together with the pressure gas in the inner cylinder 9 of the child cap 2 and sealed in advance with the bottom lid 3, as shown in FIG. Then, the inner cylinder 9 is inserted into the outer cylinder 6 until the bottom lid 3 exceeds the bottom lid opening portion 6o. Even if the bottom lid 3 exceeds the bottom lid opening portion 6o, the bottom lid 3 does not go out of the outer cylinder 6 and remains in the bowl-shaped portion 6p.

  As shown in FIG. 20, with respect to the bottle 50, the parent cap 1 keeps the outer cylinder 6 until the stopper collar 6 s at the upper end of the outer cylinder 6 hits the upper edge of the mouth 50 a of the bottle 50 and is locked down. 6 is press-fitted into the mouth portion 50 a of the bottle 50. The seal projection 6t on the outer peripheral surface of the outer cylinder 6 is pressed against the inner peripheral surface of the mouth portion 50a of the bottle 50 to seal between them. The child cap 2 is screwed so that the female screw 8d is screwed into the male screw 50b of the mouth portion 50a of the bottle 50 and the stopper ring 6s of the outer cylinder 6 is pressed from above by the sealing ring 10 of the child cap 2.

  In the case of the third embodiment, when the child cap 2 is rotated in the opening direction with respect to the mouth portion 50a of the bottle 50, the child cap 2 rises and the upper peripheral edge of the bottom lid 3 opens the bottom lid of the outer cylinder 6 of the parent cap 1. When the bottom lid opening teeth 3f and 6i are engaged with each other at the portion 6o, the bottom lid 3 cannot rotate with the inner cylinder 9, and the screw 3e of the bottom lid 3 and the screw 9a of the inner cylinder 9 are disengaged. The bottom lid 3 is detached from the inner cylinder 9 and separated. As shown in FIG. 21, the separated bottom lid 3 is slidably accommodated in a bowl-shaped portion 6p of the outer cylinder 6, and is formed on the inner peripheral edge of the lower end of the trunk portion of the bowl-shaped portion 6p from the outer diameter of the bottom lid 3. Since the bottom lid drop prevention stopper 6r having a small inner diameter is formed, the bottom lid 3 remains in the bowl-shaped portion 6p and does not fall into the bottle.

It is an exploded view of the bottle cap of Example 1 of this invention, (A) is the perspective view, (B) is sectional drawing. In the state which assembled | assembled the child cap and bottom cover of Example 1, (A) is a perspective view, (B) is sectional drawing. FIG. 2A is a perspective view, and FIG. 2B is a cross-sectional view, with the parent cap included in FIG. In a state where the parent cap is assembled, (A) is a perspective view and (B) is a cross-sectional view. It is an expansion cross-sectional view of the drooping cylinder part of the outer cylinder of a parent cap. It is a partially cutaway perspective view of a bottom cover. It is a top view of a bottom cover. It is an expanded sectional view of the state in the middle of assembling the child cap which sealed the inner cylinder first with the bottom cover with the parent cap. It is the same expanded sectional view. It is an expanded sectional view of the state where the bottle cap of Example 1 was attached to the bottle. It is an expanded sectional view which shows a state when a child cap is rotated and the locked state with respect to a bottle is cancelled | released, and the bottom lid opening tooth and the bottom lid opening tooth of the outer cylinder of the parent cap mesh. It is an expanded sectional view of the state where the bottom cover was separated from the inner cylinder and suspended from the outer cylinder, and the raw material in the inner cylinder was released. It is sectional drawing which shows that extraction of the parent cap from a bottle mouth part is prevented after opening. It is a bottle cap of Example 2 of this invention, Comprising: It is an expanded sectional view of the state in the middle of assembling the child cap which sealed the inner cylinder previously with the bottom cover. It is an expanded sectional view of the state where the bottle cap of Example 2 was attached to the bottle. It is a bottle cap of Example 2, Comprising: A bottom cover isolate | separated from the inner cylinder, it was suspended by the outer cylinder, and it is an expanded sectional view of the state by which the raw material in an inner cylinder was discharge | released. 6 is a plan view of a part of a bottom lid connecting piece in Embodiment 2. FIG. It is an exploded sectional view of the bottle cap of Example 3 of the present invention. It is a bottle cap of Example 3, Comprising: It is an expanded sectional view of the state in the middle of assembling the child cap which sealed the inner cylinder previously with the bottom cover. It is an expanded sectional view of the state where the bottle cap of Example 3 was attached to the bottle. It is a bottle cap of Example 3, Comprising: A bottom cover isolate | separated from the inner cylinder, it was suspended by the outer cylinder, and it is an expanded sectional view of the state by which the raw material in an inner cylinder was discharge | released.

Explanation of symbols

1 parent cap 2 child cap 3 bottom lid 3a central convex portion 3b inner peripheral wall 3c outer peripheral wall 3d annular concave groove 3e screw 3f bottom lid opening tooth 3g rib 3h joint projection 3x bottom lid holding ring 3y connecting portion 3z escape recess 4 cap body 4a Top portion 4b Body portion 4c Female thread 4d Bridge 4e Recess 5 Cap body portion 5a Top portion 5b Body portion 5c Gap 5d Annular tooth portion 5e Retaining protrusion 5f Tightening protrusion 5g Reinforcement flange 5h Knurl 6 Outer tube 6a Mouth 6b Drooping cylinder 6c Slit 6d Seal projection 6e Male thread 6f Child cap lock collar 6g Bottom cover fall prevention stopper 6h Bottom opening 6i Bottom cover opening tooth 6j Bottom cover connection piece 6k, 6l Cut or recess 6m Joint hole 6n Notch 6o bottom lid opening 6p collar 6q slit 6r bottom lid drop prevention stopper 6s stopper collar 6t seal Projection 7 Gap 8 Cap body 8a Top 8b Body 8c Gap 8d Female thread 8e Knurl 8f Bridge 8g Recess 9 Inner tube 9a Projection edge 9b Ring groove 10 Sealing ring 11 Locking separation ring 11a Separation projection 12 Raw material 13 Stop cylinder 13a Stopper projection 13b Slit 13c Seal projection 13d Bottom lid fall prevention projection 13e Bottom lid opening tooth 13f Notch 50 Bottle 50a Mouth 50b Male thread 50c Reinforcement collar 50d Locking collar

Claims (8)

An outer cylinder, a parent cap that is inserted into the mouth of the bottle and fixed to the mouth, and an inner cylinder that is inserted into the outer cylinder and serves as a raw material storage section. It consists of a child cap that opens and closes the upper end opening together with the mouth of the bottle and a bottom lid that seals the lower end opening of the inner cylinder. By rotating the child cap in the opening direction, the bottom lid is separated from the inner cylinder, In the bottle cap where the raw material in the cylinder is released into the bottle,
The bottom lid seals the lower end opening of the inner cylinder by screwing a screw formed thereon, and the bottom lid opening portion of the outer cylinder is formed with the bottom lid after the sealing being the top. The inner cylinder is inserted into the outer cylinder until the bottom cover is crossed, and bottom cover opening teeth that engage with the bottom cover and the bottom cover opening portion of the outer cylinder are formed. Turn the child cap in the opening direction. As the bottom lid opening teeth of the bottom lid mesh with the bottom lid opening teeth of the outer cylinder, the rotation of the bottom lid is prevented, and the bottom screw and the inner cylinder are unscrewed from each other, The lid is separated from the inner cylinder, and bottom lid fall prevention means for holding the separated bottom lid on the outer cylinder and preventing the lid from falling into the bottle is provided. Bottle cap.   The bottom cover opening tooth of the outer cylinder is formed at the lower edge of the outer cylinder, and the bottom cover opening tooth of the bottom cover is formed at the upper peripheral edge of the bottom cover. The bottle cap according to claim 1, wherein the bottle cap is inserted into the outer cylinder.   The bottom lid fall prevention means is a bottom lid holding ring that fits into the outer cylinder, and is provided integrally with the bottom lid via an elastic connecting portion and engages with a stopper portion provided on the outer cylinder. The bottle cap according to claim 1 or 2, wherein the bottom lid separated from the inner cylinder is held by the outer cylinder.   The bottom lid drop prevention means is an elastic bottom lid connecting piece that is integrally suspended from the outer cylinder. The bottom lid connecting piece and the bottom lid are joined to each other so that the bottom lid The bottle cap according to claim 1 or 2, wherein the bottom cap separated from the inner cylinder is held in the outer cylinder by being connected to the outer cylinder via the bottom lid connecting piece.   The bottle cap according to any one of claims 1 to 4, wherein a slit that allows elastic deformation of the outer cylinder accompanying press-fitting of the bottom lid is formed in the outer cylinder.   The bottom lid opening part is formed annularly in the outer cylinder, and the bottom lid fall prevention means is a bowl-shaped part integrally formed with the outer cylinder below the bottom lid opening part, and the bottom lid separated from the inner cylinder The bottle cap according to claim 1, wherein the bottle cap is accommodated in the bowl-shaped portion so as to be prevented from falling.   The lower end of the inner cylinder is fitted into an annular groove formed in the bottom cover, and the screws formed on the fitting portion are screwed together so that the bottom cover seals the lower end opening of the inner cylinder. It has become, The bottle cap in any one of Claims 1-6 characterized by the above-mentioned.   The parent cap has a cap body that covers the mouth portion of the bottle, and the upper portion of the outer cylinder protrudes upward from the cap body to become the mouth portion of the outer cylinder. The male screw that engages with the female screw of the child cap in this mouth portion Further, on the inner peripheral surface of the cap body portion, there is formed a tightening protrusion that engages with the male screw of the bottle mouth and tightens the cap body portion, and is separated from the tightening protrusion. A retaining projection is formed on the lower side of the bottle, and the distance between the projection and the bottle is lower than the male screw when the tightening projection is engaged with the male screw of the bottle mouth and the cap body is tightened. The cap body until the locking protrusion formed on the outer peripheral surface of the section is forced over the locking collar and positioned below it, and the tightening protrusion is disengaged from the upper end of the male screw at the mouth of the bottle Loosen Bottle cap according to claim 1, locking projections missing characterized in that the distance to maintain the state of being positioned below the locking flange portion.

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