JP2005088997A - Bottle cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the sealing property of a bottom lid to the lower end opening of an internal cylinder in a parasite cap, to sufficiently secure the airtightness although a pressure gas is sealed in the internal cylinder, and to prevent the intrusion of a liquid in a bottle into a clearance between the internal peripheral surface of an external cylinder and the external peripheral surface of the internal cylinder. <P>SOLUTION: An annular recess section 3c into which the lower end of the internal cylinder 9 in the parasite cap 2 is pressed is integrally formed at the rim of the bottom lid 3, and a packing 12 made of a material softer than that of the annular recess section is integrally provided on the internal surface of the annular recess section by the simultaneous formation with the annular recess section. A stepped part 6f which closely contacts the internal peripheral surface of the annular recess section in the bottom lid is formed at the lower end of the external cylinder 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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.

  Conventionally, as this kind of bottle cap, for example, those described in Patent Document 1 (Japanese Utility Model Publication No. 44-12957) and Patent Document 2 (Japanese Patent No. 3281730) are known. As a bottle cap that solves the problem caused by the above, a bottle cap as shown in FIGS. 1 to 4 has been proposed first, and a patent application (Japanese Patent Application No. 2002-272185) has been made and commercialized. 1 and 2 show the state before the assembly, FIG. 3 shows the assembled state, and FIG. 4 shows the state set in the bottle.

  The bottle cap includes a parent cap 1, a child cap 2, and a bottom lid 3 that are molded with resin.

  The parent cap 1 is integrally provided with an outer cylinder 6 having upper and lower ends opened on a cap body 5 that covers a mouth portion 50a of a bottle 50 (FIG. 4) such as a PET bottle. The outer cylinder 6 integrally penetrates the top part 5a of the cap body 5 vertically, and the upper part protruding upward from the top part 5a becomes a mouth part 6a whose upper end is open, and the lower part protruding downward from the top part 5a. Is a hanging cylinder portion 6b that hangs downward from its lower end and opens at its lower end while forming a gap with the body portion 5b of the cap body 5. The drooping cylinder portion 6b is tapered with a step near the top portion 5a, and then gradually tapers toward the lower end opening. A minute step portion 6c that slightly increases the thickness is formed in the middle of the inner peripheral surface of the hanging tube portion 6b.

  A female screw 5c is formed on the inner peripheral surface of the body portion 5b of the cap body 5 to be screwed with the male screw 50b of the mouth portion 50a of the bottle 50, and a male screw is provided on the outer peripheral surface of the mouth portion 6a of the outer cylinder 6. 6d is formed. An anti-slip knurl 5d is formed on the outer peripheral surface of the body portion 5b when the finger is put on it.

  The child cap 2 integrally protrudes from the lower surface of the top portion 8a of the cap body 8 with the inner cylinder 9 serving as a raw material and pressurized gas filling section (capsule), and is thin at a position close to the outer periphery of the inner cylinder 9. A short sealing ring 10 is integrally projected. The inner cylinder 9 protrudes much longer than that while forming a gap with the body portion 8b of the cap body 8. The inner cylinder 9 is slightly smaller in diameter than the outer cylinder 6 and can be inserted with a slight gap between the inner cylinder 6 but the length is slightly longer than the outer cylinder 6. Yes. The inner cylinder 9 has the same inner diameter from the upper end to the lower end, but the outer diameter gradually decreases from the upper end to the lower end so that the thickness of the inner cylinder 9 is gradually reduced, and the lower end edge is outward. A protruding edge 9e is formed. Further, on the outer peripheral surface of the inner cylinder 9, a minute step portion 9 c that is slightly thinned is formed.

  An annular lower peripheral edge portion 8c of the trunk portion 8b of the child cap 2 is separable from an upper portion thereof by a thin notch 8d extending over the entire circumference. On the inner peripheral surface of the body portion 8b above the notch 8d, a female screw 8e that is screwed with the male screw 6d of the mouth portion 6a of the outer cylinder 6 is formed. As shown in FIG. 3, the female screw 8e is screwed into the male screw 6c, and the child cap 2 is moved to the mouth of the outer cylinder 6 until the annular lower peripheral edge portion 8c forcibly exceeds the end of the male screw 6d. If it covers 6a, mouth part 6a will be sealed airtight and liquid-tight. At this time, the child cap 2 has its annular lower peripheral edge portion 8c fixed so as not to rotate with respect to the mouth portion 6a, and the lower end portion of the inner cylinder 9 projects from the lower end opening of the drooping cylinder portion 6b of the outer cylinder 6, A minute step portion 9c in the middle of the outer peripheral surface of the inner cylinder 9 and a minute step portion 6c in the middle of the inner peripheral surface of the outer cylinder 6 are close to each other and vertically face each other. Further, the sealing ring 10 is press-fitted into the mouth portion 6 a of the outer cylinder 6, the top portion 8 a of the child cap 2 is pressed against the upper end of the outer tube 6, and the sealing ring 10 is connected to the corner portion of the trunk portion 8 b of the child cap 2. Thus, the mouth portion 6a of the outer cylinder 6 is clamped from inside and outside. An anti-slip knurl 8f is formed on the outer peripheral surface of the body portion 8b, and an arrow 8g is provided on the top surface of the top portion 8a so as to indicate the opening direction.

  The bottom cover 3 includes a pressing portion 3a having a convex upper surface and a concave lower surface, an annular recess 3c that forms an annular groove 3b having a reverse Ω-shaped cross section with the periphery of the pressing portion 3a, and a concave surface of the pressing portion 3a. A protrusion 3d protruding downward from the center of the lower surface is integrally formed. While the lower end portion of the inner cylinder 9 is forcibly fitted into the annular groove 3b, and the pushing portion 3a is pushed into the inner cylinder 9, the bottom lid 3 is made of pressurized gas (inert gas) as shown in FIG. And the lower end opening of the inner cylinder 9 filled with the raw material 11 is hermetically and liquid-tightly sealed.

  In such a bottle cap, when the inner cylinder 9 is raised in the direction of opening the child cap 2, the upper edge of the annular recess 3 c of the bottom cover 3 comes into contact with the lower end edge of the outer cylinder 6 and the bottom cover 3. Is restrained from rising further, the fitting between the protruding edge 9e at the lower end of the inner cylinder 9 and the annular recess 3c of the bottom cover 3 is released, and the bottom cover 3 is dropped from the inner cylinder 9 that is further rising. . When this falls off, the raw material 11 in the inner cylinder 9 is ejected at a stretch together with the pressure gas. The bottom lid 3 settles in the liquid in the bottle.

However, even with such a structure, the following problems occur.
(1) In the child cap 2 and the bottom lid 3, by fitting the bulging protrusion 9e at the lower end of the former inner cylinder 9 and the annular concave groove 3b having an inverted Ω cross section of the latter annular concave 3c, Although an attempt was made to improve the sealing performance of the bottom lid 3 with respect to the lower end opening of the inner cylinder 9, it was not sufficient to ensure the airtightness of the inner cylinder 6 in which the pressure gas was sealed.

(2) In order to facilitate the extraction of the inner cylinder 9 from the outer cylinder 6, a slight gap is formed between the inner peripheral surface of the outer cylinder 6 and the outer peripheral surface of the inner cylinder 9. Since the liquid in the bottle permeates, this gap must be cleaned and sterilized before the bottle cap is set at the mouth of the bottle (before the bottom lid 3 is closed and sealed). Cleaning and sterilization is difficult due to the gaps, and not only the equipment for that is expensive, but also running costs.

(3) After the bottom cap 3 is dropped from the inner cylinder 9 by opening the child cap 2, normally only the child cap 2 is removed from the parent cap 1, and the parent cap 1 is a bottle so as not to accidentally swallow the bottom lid 3. 50, but leave it in the mouth part 50a, but even if it is written in such a way that it should be drunk, the parent cap 1 is forcibly removed from the mouth of the bottle by mischief, and the parent cap 1 comes off There was an example that the bottom lid 3 was accidentally swallowed by drinking with the mouth part of a bottle.

(4) A part of the outer cylinder 6 of the parent cap 1, that is, the hanging cylinder part 6 b remains in the bottle opening even after the child cap 2 is opened, and the protruding part is the opening of the bottle opening. Since this hinders the outflow of liquid from the liquid, there is a problem that a small amount of unsold drink is generated.

(5) The child cap 2 is formed with a thin notch 8d over the entire circumference in the body portion 8b, so that the upper part of the notch 8d is separated from the lower annular lower peripheral edge portion 8c, and the annular lower peripheral edge Although the portion 8c remains in the mouth of the bottle, since the means for causing separation is a thin notch 8d around the entire circumference, a large twisting force is required for the separation, and therefore, the parent cap 1 There was a risk that the parent cap 1 would also come off the mouth of the bottle.
Japanese Utility Model Publication No. 44-12957 (first page, FIG. 1, FIG. 2) Japanese Patent No. 3281730 (Page 2, FIGS. 1 and 3)

  The first problem of the present invention is to improve the sealing performance of the bottom lid with respect to the lower end opening of the inner cylinder of the child cap, and to ensure sufficient airtightness even if pressure gas is sealed in the inner cylinder. There is.

  The second problem is that the liquid in the bottle can be prevented from entering the slight gap between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder, and cleaning and sterilization work for the gap is prevented. It is to be able to omit.

  A third problem is to prevent accidental ingestion of the bottom cover due to mischief or the like by preventing the parent cap from being removed from the mouth of the bottle.

  A fourth problem is to prevent a leftover based on the outer cylinder of the parent cap from occurring.

  The fifth problem is to reduce the twisting force necessary to open the cap while partially separating the child cap so that the opening operation can be easily performed.

  The present invention seals a parent cap having an outer cylinder to be inserted into the mouth of a bottle, a child cap having an inner cylinder to be inserted into the outer cylinder and serving as a raw material storage section, and a lower end opening of the inner cylinder The bottle cap can be sealed together with the upper end opening of the outer cylinder by screwing the child cap onto the outer cylinder of the parent cap. By rotating the child cap in the opening direction with respect to the outer cylinder of the parent cap, the bottom lid is dropped from the inner cylinder by the outer cylinder of the parent cap, and the bottle cap in which the raw material in the inner cylinder is discharged into the bottle, The first to fourth problems are solved by adopting the following means.

  As for the first problem, an annular recess capable of press-fitting the lower end portion of the inner cylinder is integrally formed on the periphery of the bottom lid, and a packing made of a softer material than the annular recess is formed with the annular recess. It is integrally provided on the inner surface of the annular recess by simultaneous molding.

  In the preferred form, the packing is embedded in the annular recess with a part protruding from the inner surface of the annular recess.

  About the 2nd subject, the step part closely_contact | adhered to the inner peripheral surface of the annular recessed part of a bottom cover is formed in the lower end part of an outer cylinder.

  As for the third problem, a plurality of lock claws are integrally formed on the inner peripheral surface of the parent cap and the outer peripheral surface of the mouth of the bottle, and both lock claws prevent rotation in the opening direction of the parent cap. Further, the rotation in the closing direction has a meshing relationship that allows the rotation.

In the preferred concrete form, the lock claw on the parent cap side and the lock claw on the bottle side each have a valley surface and an inclined shoulder surface, and the valley surfaces of the parent cap face each other to engage with each other. Rotation in the opening direction is prevented.
The number of lock claws on the parent cap side is larger than the number of lock claws on the bottle side.

  About the 4th subject, the slit extended upwards from the lower end to the middle is formed in the outer cylinder of a parent cap.

  For the fifth problem, a band part that cannot be pulled out with respect to the parent cap is attached to the lower edge of the child cap in a partially continuous manner by the bridge, and by forcibly rotating the child cap in the opening direction, The bridge cuts and separates from the band part.

  In the preferable form, the recessed part and convex part which fit up and down are formed between the lower peripheral edge of the child cap and the band part.

  According to the present invention, since the soft material packing is provided on the inner surface of the annular recess at the peripheral edge of the bottom cover by simultaneous molding, when the lower end opening of the inner cylinder is sealed with the bottom cover, the child cap is attached to the annular recess. In addition to the lower end of the inner cylinder being press-fitted, the seal is very close to the inner cylinder in a state where the packing is compressed in the annular recess. Even if sealed, the airtightness can be sufficiently secured.

  When the packing is embedded in the annular recess, the integrity of the packing and the annular recess is enhanced, and the moldability of the packing is improved.

  When a step portion is formed at the lower end portion of the outer cylinder so as to be in close contact with the inner peripheral surface of the annular recess of the bottom lid, the liquid in the bottle is placed in a slight gap between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder. Can be prevented from entering, and thus cleaning and sterilization of the gap can be omitted.

  Between the inner peripheral surface of the parent cap and the outer peripheral surface of the mouth of the bottle, the locking claw provided on both prevents the rotation in the opening direction of the parent cap and allows the rotation in the closing direction to be allowed. Therefore, the parent cap does not come off from the mouth of the bottle and can prevent accidental ingestion of the bottom lid due to mischief or the like.

  In the outer cylinder of the parent cap, a slit extending upward from the lower end to the middle is formed, and the liquid in the bottle can be discharged through this slit, so that no leftovers do not occur.

  When the child cap is forcibly rotated in the opening direction, the bridge connecting the band part on the lower edge of the child cap is cut, and the child cap is separated from the band part. The twisting force is not required and the opening operation can be easily performed.

  Since a concave portion and a convex portion that are vertically fitted are formed between the lower peripheral edge of the child cap and the band portion, inadvertent separation of the band portion can be prevented.

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

  Since the present embodiment basically has the same structure as the conventional example shown in FIGS. 1 to 4, the same components will be described first with the same reference numerals, and then the differences will be described.

  As shown in FIG. 5, the bottle cap of this embodiment also includes a parent cap 1, a child cap 2, and a bottom lid 3 that are resin-molded.

  The parent cap 1 is integrally provided with an outer cylinder 6 whose upper and lower ends are open on a cap body 5 that covers a mouth portion 50a of a bottle 50 (FIG. 8) such as a PET bottle. The outer cylinder 6 integrally penetrates the top part 5a of the cap body 5 vertically, and the upper part protruding upward from the top part 5a becomes a mouth part 6a whose upper end is open, and the lower part protruding downward from the top part 5a. Is a hanging cylinder portion 6b that hangs downward from its lower end and opens at its lower end while forming a gap with the body portion 5b of the cap body 5. The drooping cylinder portion 6b is tapered with a step near the top portion 5a, and then gradually tapers toward the lower end opening.

  A female screw 5c is formed on the inner peripheral surface of the body portion 5b of the cap body 5 to be screwed with the male screw 50b of the mouth portion 50a of the bottle 50, and a male screw is provided on the outer peripheral surface of the mouth portion 6a of the outer cylinder 6. 6d is formed. An anti-slip knurl 5d is formed on the outer peripheral surface of the body portion 5b when the finger is put on it.

  The child cap 2 integrally protrudes from the lower surface of the top portion 8a of the cap body 8 with the inner cylinder 9 serving as a raw material and pressurized gas filling section (capsule), and is thin at a position close to the outer periphery of the inner cylinder 9. A short sealing ring 10 is integrally projected. The inner cylinder 9 protrudes much longer than that while forming a gap with the body portion 8b of the cap body 8. The inner cylinder 9 is slightly smaller in diameter than the outer cylinder 6 and can be inserted with a slight gap between the inner cylinder 6 but the length is slightly longer than the outer cylinder 6. Yes. The inner cylinder 9 has the same inner diameter from the upper end to the lower end, but the outer diameter gradually decreases from the upper end to the lower end so that the thickness of the inner cylinder 9 is gradually reduced, and the lower end edge is outward. A protruding edge 9e is formed. Further, on the outer peripheral surface of the inner cylinder 9, a minute step portion 9 c that is slightly thinned is formed.

  On the inner peripheral surface of the body portion 8b of the child cap 2, a female screw 8e that is screwed with the male screw 6d of the mouth portion 6a of the outer cylinder 6 is formed. An anti-slip knurl 8f is formed on the outer peripheral surface of the body portion 8b, and an arrow 8g is provided on the top surface of the top portion 8a so as to indicate the opening direction.

  The bottom cover 3 includes a pressing portion 3a having a convex upper surface and a concave lower surface, an annular recess 3c that forms an annular groove 3b having a reverse Ω-shaped cross section with the periphery of the pressing portion 3a, and a concave surface of the pressing portion 3a. A protrusion 3d protruding downward from the center of the lower surface is integrally formed.

The above configuration is the same as the conventional example shown in FIGS. 1 to 4, and the following configuration is different.
As for the bottom lid 3, an annular packing 12 made of a material softer than the annular recess 3c, such as silicon rubber or polypropylene, is formed in the annular recess 3c at the periphery of the bottom lid 3 by simultaneous molding with the annular recess 3c. It is integrally provided on the inner surface. Specifically, a part of the packing 12 protrudes from the inner surface of the annular recess 3c, is embedded in the bottom of the annular recess 3c, and is integrated with the annular recess 3c.

  As for the child cap 2, an annular band portion 13 formed integrally with the child cap 2 is attached to the lower peripheral edge of the body portion 8b so as to be separable and partially connected thereto. That is, the trunk portion 8b and the band portion 13 of the child cap 2 are only slightly connected together by a bridge 14 which is a small connecting portion, and are separated when the bridge 14 is cut. In addition, small concave portions 15a are provided at the lower peripheral edge of the body portion 8b of the child cap 2, and small convex portions 15b are provided at the band portion 13, respectively. The concave portions 15a and the convex portions 15b are fitted to each other. . In addition, you may connect the trunk | drum 8b and the band part 13 of the child cap 2 integrally by these fitting parts so that these recessed parts 15a and the convex parts 15b may serve as the bridge | bridging 14. FIG.

  Regarding the parent cap 1, an annular retaining portion 6 e is integrally provided on the outer peripheral surface of the mouth portion 6 a of the outer cylinder 6 between the end of the male screw 6 d and the top portion 5 a of the cap body 5. In addition, slits 16 extending from the lower end to the middle of the hanging cylinder portion 6b of the outer cylinder 6 are provided at a plurality of locations (for example, 3 locations). Further, a large number of locking claws 17 are integrally formed on the lower peripheral edge of the inner peripheral surface of the body portion 5b of the cap body 5 as shown in FIG. Each lock claw 17 has a trough surface 17a and an inclined shoulder surface 17b toward one direction of the circumference of the body portion 5b, and the inner peripheral surface of the body portion 5b is continuous in a sawtooth shape as a whole. Yes.

  On the other hand, as shown in FIGS. 10 and 11, a plurality of locking claws 18 are integrally formed on the outer peripheral surface of the mouth portion 50 a of the bottle 50 so as to protrude on the reinforcing flange portion 50 c. The lock claw 18 also has a valley surface 18a and an inclined shoulder surface 18b. The direction of the lock claw 18 is opposite to that of the lock claw 17 on the parent cap 1 side, and the size is larger than that. For example, four are provided at intervals of 90 degrees.

Example 1 having such a configuration is in an assembled state as follows.
In the assembly of the parent cap 1 and the child cap 2, as shown in FIG. 6, the female screw 8e of the child cap 2 is screwed into the male screw 6d of the parent cap 1, and the annular band portion 13c is prevented from coming off. When the child cap 2 is put on the mouth portion 6a of the outer cylinder 6 until it is forcibly exceeded, the mouth portion 6a is hermetically and liquid-tightly sealed. At this time, the band portion 13 of the child cap 2 is prevented from being removed by the retaining portion 6e, and the lower end portion of the inner cylinder 9 protrudes from the lower end opening of the hanging cylinder portion 6b of the outer cylinder 6, A minute step portion 9c in the middle of the outer peripheral surface is located where the inner diameter of the hanging cylinder portion 6b is narrowed. Further, the sealing ring 10 is press-fitted into the mouth portion 6 a of the outer cylinder 6, the top portion 8 a of the child cap 2 is pressed against the upper end of the outer tube 6, and the sealing ring 10 is connected to the corner portion of the trunk portion 8 b of the child cap 2. Thus, the mouth portion 6a of the outer cylinder 6 is clamped from inside and outside.

  In the assembly of the child cap 2 and the bottom lid 3, as shown in FIG. 7, the annular concave groove 3 b having a reverse Ω cross section of the annular concave portion 3 c of the bottom lid 3 and the lower end of the inner cylinder 9 of the child cap 2 are swollen. The projecting edge 9e is forcibly fitted, and the projecting portion of the packing 12 is compressed at the lower end of the inner cylinder 9. Then, the bulging ridge 9e at the lower end of the inner cylinder 6 is pressed into the annular groove 3 having an inverted Ω cross section while the protruding portion of the packing 12 is compressed. The blockage by the lid 3 has a very high sealing performance, and even if a pressure gas is sealed in the inner cylinder 9, the airtightness can be sufficiently secured.

  As shown in FIG. 8, the raw material 11 is sealed together with the pressure gas in the inner cylinder 9, and as the raw material, green tea, coffee, tea, concentrated minerals, deep sea water extracted minerals, health foods, drugs, concentrated Examples include fruit juice, dairy products, alcohol, concentrated vegetables, soup ingredients, vitamins, sugars, medicinal herbs, fermented bacteria, etc. in powders, granules, tablets or liquids. Moreover, as the pressure gas, an inert gas that can safely maintain the quality of the raw material 11 is good, and examples thereof include nitrogen, helium, argon, carbon dioxide, nitrous oxide, or a mixed gas thereof.

  When the bottle cap of this embodiment assembled as described above is attached to the mouth portion 50a of a bottle 50 such as a plastic bottle as shown in FIG. 8, the outer cylinder 6 is inserted into the bottle mouth portion 50a, The cap 1 is turned in the closing direction so that the female screw 5c of the cap body 5 is screwed into the male screw 50b of the bottle mouth portion 50a, and the lock claw 17 of the cap body 5 of the parent cap 1 is on the bottle mouth portion 50a side. Until the lock claw 18 is engaged, the parent cap 1 is further rotated in the closing direction to seal the bottle mouth portion 50a.

  That is, as shown in the sectional view of FIG. 12, when the parent cap 1 is turned in the closing direction (arrow C direction), the inclined shoulder surface 17b of the lock claw 17 on the parent cap 1 side is locked on the bottle mouth portion 50a side. Since the lock claw 18 is moved over the shoulder surface 18b that faces the inclined claw 18 while sliding, the parent cap 1 can be rotated in the closing direction even if the lock claw 18 is present. It can be tightened firmly until it reaches However, after that, when turning the parent cap 1 in the opening direction (arrow O direction), the trough surface 17a of the locking claw 17 on the parent cap 1 side is connected to the trough surface 18a of the locking claw 18 on the bottle mouth portion 50a side. Faced with each other, the rotation of the parent cap 1 is prevented, so that the parent cap 1 cannot be removed from the bottle mouth portion 50a.

  On the other hand, in the case of the child cap 2, when this is rotated in the opening direction with respect to the parent cap 1, the child cap 2 is screwed upward with respect to the mouth 6a of the outer cylinder 6 of the parent cap 1. 2 is restricted from rising by the retaining portion 6e on the side of the parent cap 1, so that as shown in FIG. In addition, the fitting between the concave portion 15a and the convex portion 15b is released.

  When the child cap 2 is further rotated, the inner cylinder 9 is also raised while rotating. However, as shown in FIG. 14, the annular recess 3 c of the bottom cover 3 is brought into contact with the lower end of the outer cylinder 6 of the parent cap 1. Since the bottom lid 3 is restrained from further rising, the bottom lid 3 comes off and falls off from the inner cylinder 9 which is further raised as shown in FIG. When this falls off, the raw material 11 in the inner cylinder 9 is ejected at a time together with the pressure gas, and the bottom lid 3 is settled in the liquid in the bottle 50.

  Even if the child cap 2 is pulled out, the parent cap 1 cannot be removed from the bottle mouth portion 50a due to the engagement of the lock claws 17 and 18 as described above, and the outer diameter of the bottom cap 3 is that of the parent cap 1. Since it is larger than the inner diameter of the lower end opening of the outer cylinder 6 and cannot pass through the outer cylinder 6, a situation in which the bottom lid 3 is accidentally swallowed does not occur.

  Even after the child cap 2 is removed, the parent cap 1 remains with the hanging cylinder portion 6b of the outer cylinder 6 inserted into the bottle mouth portion 50a as shown in FIG. Since the slit 16 extending partway from the lower end is formed, the liquid that has entered between the drooping cylinder portion 6 b and the bottle mouth portion 50 a can be discharged through the slit 16.

  Next, a second embodiment of the present invention will be described. FIG. 17 is a sectional view of the entire bottle cap, and FIG. 18 is an enlarged sectional view of a portion different from the first embodiment.

  In order to facilitate the extraction of the inner cylinder 9 with respect to the outer cylinder 6, if a slight gap 19 is formed between the inner circumferential surface of the outer cylinder 6 and the outer circumferential surface of the inner cylinder 9, a bottle is formed in the gap 19. Since the liquid in the main body 50 permeates, the gap must be cleaned and sterilized before the bottle cap is set in the mouth 50a of the bottle 50.

  Therefore, in the second embodiment, in order to prevent the liquid from entering the gap 19, in addition to the configuration of the first embodiment, a step portion whose outer diameter is reduced stepwise is formed on the outer peripheral surface of the lower end portion of the outer cylinder 6. 6f is formed, and when the bottom lid 3 is closed, the step 6f enters the annular recess 3c of the bottom lid 3 and closely contacts the inner peripheral surface of the annular recess 3c, and seals the gap 19 at the contact portion. It is a thing.

  When the minute protrusion 6g is formed on the entire outer periphery of the stepped portion 6f, the minute protrusion 6g bites into the inner peripheral surface of the annular recess 3c, so that the sealing performance is improved.

  Further, an outward projecting edge 9 e is formed at the lower end of the inner cylinder 9, and an inward projecting portion 3 e is formed at an intermediate portion of the inner peripheral surface of the annular recess 3 c of the bottom cover 3. For this reason, when the inner cylinder 9 is raised while rotating when the child cap 2 is rotated and opened, the protruding edge 9e of the inner cylinder 9 goes upward while being pressed against the inward protruding part 3e of the annular recess 3c. Therefore, since the annular recess 3c is slightly expanded, the inner peripheral surface thereof is slightly separated from the stepped portion 6f. In this state, the upper peripheral edge and the inward projection 3e of the annular recess 3c are engaged with the lower end of the outer cylinder 7. Thus, the bottom lid 3 can be removed without hindrance. The outward projecting edge 9e and the inward projecting portion 3e also improve the sealing performance between the lower end of the inner cylinder 9 and the bottom cover 3.

  Further, since the outer peripheral surface of the outer cylinder 6 is in close contact with the inner peripheral surface of the bottle mouth portion 50a, the liquid in the bottle main body 50 does not enter between them.

  In the above-described embodiment, the case where the bottle 50 according to the present invention is applied to the bottle 50 in which the mouth part 50a is narrowed with respect to the bottle body part has been described. It can also be applied to other bottles.

FIG. 2A is a perspective view and FIG. 2B is a cross-sectional view of the conventional example before assembly. In the same state, (A) is a perspective view and (B) is a cross-sectional view. In the assembled state, (A) is a perspective view and (B) is a cross-sectional view. It is sectional drawing of the state set to the bottle of the prior art example. In the state before the assembly of Example 1 of the present invention, (A) is a perspective view, (B) is a sectional view. In the same state, (A) is a perspective view and (B) is a cross-sectional view. In the assembled state, (A) is a perspective view and (B) is a cross-sectional view. It is sectional drawing of the state set to the bottle of the Example. It is a bottom view of the parent cap in the same Example. It is a perspective view which shows the bottle side. It is a top view of the mouth. It is sectional drawing which shows the meshing state of the lock nail | claw by the side of a parent cap, and the lock nail | claw by the side of a bottle mouth part. It is sectional drawing which shows opening operation of Example 1, and is a state when the band part of a child cap isolate | separated. Similarly, this is the state immediately before the annular recess of the bottom lid and the inner end of the child cap are disengaged. Similarly, the bottom lid is in a state of falling off. Similarly, this is the state after the child cap is removed. It is sectional drawing of the state before the assembly of Example 2 of this invention. It is an expanded sectional view of the principal part.

Explanation of symbols

1 parent cap 2 child cap 3 bottom lid 3a push-in portion 3b annular groove 3c annular recess 3d protrusion 3e inward projection 5 cap body 5a top 5b trunk 5c female screw 5d knurl 6 outer cylinder 6a mouth 6b drooping cylinder 6d Male screw 6e retaining portion 6f step portion 6g minute protrusion 8 cap body 8a top portion 8b barrel portion 8e female screw 8f knurl 8g arrow 9 inner cylinder 9c step portion 9e protruding edge 11 raw material 12 packing 13 band portion 14 bridge 15a recess 15b convex Part 16 Slit 17 Lock claw 17a Valley surface 17b Shoulder surface 18 Lock claw 18a Valley surface 18b Shoulder surface 19 Clearance 50 Bottle 50a Mouth part 50b Male thread 50c Reinforcement collar

Claims (9)

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 section, and a bottom lid for sealing the lower end opening of the inner cylinder; The bottle cap can be sealed together with the upper end opening of the outer cylinder by screwing the child cap onto the outer cylinder of the parent cap. In the bottle cap in which the bottom lid is dropped from the inner cylinder by the outer cylinder of the parent cap by turning in the opening direction with respect to the outer cylinder of the cap, and the raw material in the inner cylinder is discharged into the bottle,
An annular recess that can press-fit the lower end of the inner cylinder is integrally formed on the periphery of the bottom lid, and a packing made of a softer material than the annular recess is annularly formed by simultaneous molding with the annular recess. A bottle cap characterized by being integrally provided on the inner surface of the recess.   The bottle cap according to claim 1, wherein a part of the packing protrudes from the inner surface of the annular recess and is embedded in the annular recess.   The bottle cap according to claim 1, wherein a stepped portion that is in close contact with the inner peripheral surface of the annular concave portion of the bottom lid is formed at a lower end portion of the outer cylinder.   A plurality of locking claws are integrally formed on the inner peripheral surface of the parent cap and the outer peripheral surface of the mouth of the bottle, respectively, and both locking claws prevent rotation in the opening direction of the parent cap and rotation in the closing direction. The bottle cap according to claim 1, wherein the bottle cap has an allowable meshing relationship.   The lock claw on the parent cap side and the lock claw on the bottle side each have a valley surface and an inclined shoulder surface, and the rotation of the parent cap in the opening direction is prevented by engaging each other's valley surface facing each other. The bottle cap according to claim 4, wherein the bottle cap is formed.   The bottle cap according to claim 4 or 5, wherein the number of lock claws on the parent cap side is larger than the number of lock claws on the bottle side.   The bottle cap according to claim 1, 2, 3, 4, 5 or 6, wherein a slit extending upward from the lower end to the middle is formed in the outer cylinder of the parent cap.   A band part that cannot be pulled out with respect to the parent cap is attached to the lower peripheral edge of the child cap by partially connecting with the bridge, and the bridge is cut by forcibly rotating the child cap in the opening direction. The bottle cap according to claim 1, 2, 3, 4, 5, 6, or 7.   The bottle cap according to claim 8, wherein a concave portion and a convex portion that are vertically fitted are formed between the lower peripheral edge of the child cap and the band portion.

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