JP4295258B2 - Bottle cap - Google Patents

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 present inventor has already provided a bottle cap of this type disclosed in Japanese Patent Application Laid-Open No. 2005-88997.
This bottle cap seals 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 lower end opening of the inner cylinder. It consists of a bottom lid that stops, covers the parent cap on the mouth of the bottle, and by screwing the child cap onto the outer cylinder of the parent cap, the mouth of the bottle can be sealed together with the upper end opening of the outer cylinder, Further, the bottle cap is a bottle cap in which the bottom cap is removed from the inner cylinder by 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, 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 into the annular groove is integrally formed on the periphery of the bottom lid, and an inner packing made of a softer material than the annular recess is formed simultaneously with the annular recess. Due to the inner surface of the annular groove It is provided integrally.

  In this prior art, when the lower end opening of the inner cylinder is sealed with the bottom cover, the lower end of the inner cylinder of the child cap is press-fitted into the annular groove of the annular recess, and further, in the annular groove The sealing performance is improved by closely contacting the lower end opening edge of the inner cylinder in a state where the inner packing is compressed.

However, even in this case, the airtightness and watertightness by the bottom lid with respect to the lower end opening of the inner cylinder are not perfect, and the raw material stored in the inner cylinder gradually changes in quality due to the liquid in the bottle body. Was inevitable.
JP 2005-88997 A

  The object of the present invention is to further improve the sealing performance of the bottom lid with respect to the lower end opening of the inner cylinder to improve the airtightness and watertightness to a perfect state, and at the same time, also seal the lower end opening of the outer cylinder to seal the inner cylinder. It is also intended to prevent liquid from entering between the outer cylinder and the outer cylinder.

  The present invention provides a sealing structure according to the above prior art, that is, in a state where the lower end portion of the inner cylinder of the child cap is press-fitted into the annular groove of the annular recess of the bottom cover and the inner packing is compressed in the annular groove. In addition to the inner seal structure that is in close contact with the lower end opening edge of the inner cylinder, an outer packing made of a material softer than the annular recess is provided integrally on the outer peripheral upper edge of the annular recess by simultaneous molding with the annular recess. By adding an outer seal structure that seals the outer packing at the lower end opening edge of the outer cylinder and seals even outside the annular recess of the bottom lid, the air tightness and water tightness are further improved. Also, the lower end opening of the outer cylinder is sealed so that liquid intrusion between the inner cylinder and the outer cylinder can be prevented.

  When the outer peripheral upper edge of the annular recess and the lower end opening edge of the outer cylinder are inclined downward from the inner periphery toward the outer periphery, the sealing performance by the outer packing is enhanced. The inclination angle is optimally about 20 degrees.

  Furthermore, when the upper inner peripheral surface following the lower end opening edge of the outer cylinder is in close contact with the outer peripheral surface of the inner cylinder, the effect of preventing liquid from entering between the inner cylinder and the outer cylinder is further improved.

  In the present invention, an outer packing made of a soft material is provided at the outer peripheral upper edge of the annular recess of the bottom lid by simultaneous molding, and the lower end opening edge of the outer cylinder is brought into contact with the outer packing, so that the outer side of the annular recess of the bottom lid However, since the packing seal is performed, it is possible to seal both inside and outside with the inner seal structure inside the annular groove of the annular recess, and the airtightness and watertightness by the bottom lid to the lower end opening of the inner cylinder are fully sealed Can be improved. In addition, the lower end opening of the outer cylinder can be sealed to prevent liquid from entering between the inner cylinder and the outer cylinder.

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

  As shown in FIG. 1, this bottle cap also 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 whose upper and lower ends are opened on a cap body 5 that covers a mouth portion 50a of a bottle 50 (shown by a chain line in 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 5f with the body portion 5b of the cap body 5. The drooping cylinder portion 6b becomes narrower near the top portion 5a and then gradually tapers toward the lower end opening. Further, an annular tooth portion 5g 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 5f.

  On the outer peripheral surface of the mouth portion 6a of the outer cylinder 6, an annular retaining portion 6e is integrally provided between the end of the male screw 6d and the top portion 5a of the cap body 5. At the lower end portion of the inner peripheral surface of the outer cylinder 6, an annular inner surface protrusion 6 f that partially increases the thickness is formed up to the lower end opening edge 6 g of the outer cylinder 6. The lower end opening edge 6g is inclined downward from the inner periphery toward the outer periphery, and the angle θ is about 20 degrees as shown in FIG.

  A plurality of locking protrusions 5e that are long in the circumferential direction are integrally formed at the lower end portion of the inner peripheral surface of the body 5b of the cap body 5. 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. A male screw 5c is formed on the outer peripheral surface of the mouth portion 6a of the outer cylinder 6. A screw 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 downward. The inner cylinder 9 protrudes much longer than that while forming a gap with the body portion 8b of the cap body 8.

  Thus, the inner cylinder 9 which is open only at the lower end is slightly smaller in diameter than the outer cylinder 6 and can be inserted with a slight gap 7 formed between the inner cylinder 9 and the outer cylinder 6 as shown in FIG. However, the length is slightly longer than the outer cylinder 6. The lower end of the inner cylinder 9 is a protruding edge 9a that bulges outward, and a shallow annular groove 9b is formed on the upper outer peripheral surface following the protruding edge 9a.

  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 formed on the top surface of the top portion 8a so as to indicate an opening direction and a closing direction. Yes.

  Further, an annular band portion 13 integrally formed with the child cap 2 is attached to the lower peripheral edge of the body portion 8b of the child cap 2 so as to be separated 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, a concave portion 15a is provided at the lower peripheral edge of the body portion 8b of the child cap 2, and a convex portion 15b is provided at a plurality of locations on the band portion 13, respectively. The concave portion 15a and the convex portion 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.

  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 front end surface (lower end surface) of the protrusion 3d is a concave surface 3g that is recessed in an arc shape.

  An annular inner packing 12A made of a material softer than the annular recess 3c, such as silicon rubber or polypropylene, is integrally provided on the bottom surface in the annular recess 3b by simultaneous molding with the annular recess 3c.

  In addition, the annular outer peripheral upper edge 3f of the annular recess 3c has a protruding edge 3e that swells inward, and, like the lower end opening edge 6g of the outer cylinder 6, is inclined downward from the inner periphery toward the outer periphery, The angle is also about 20 degrees. An annular outer packing 12B made of the same material as the inner packing 12A is integrally provided on the outer peripheral upper edge 3f by simultaneous molding with the annular recess 3c.

  On the other hand, as shown in FIG. 4, on the outer peripheral surface of the mouth part 50a of the bottle 50, a lock hook part 50d is integrally formed between the male screw 50b and the reinforcing hook part 50c.

The present embodiment 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. 2, 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 13 is further 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 watertightly sealed. At this time, the band portion 13 of the child cap 2 is prevented from being removed by the retaining portion 6 e, and the lower end portion of the inner cylinder 9 projects from the lower end opening of the hanging cylinder portion 6 b of the outer cylinder 6. The inner surface protrusion 6 f at the lower end of the inner surface is in close contact with the outer peripheral surface of the inner cylinder 9. 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. 3, 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 protruding edge 9e is forcibly fitted, and the inner packing 12A is compressed by the lower end opening edge 9c of the inner cylinder 9. Then, the lower end opening edge 9c of the inner cylinder 6 is in a state in which the protruding edge 9a of the inner cylinder 9 is press-fitted into the annular groove 3 having a reverse Ω cross section while the inner packing 12A is compressed. The protruding edge 3e that swells inward partially enters the annular groove 9b on the outer peripheral surface of the inner cylinder 9, and presses the protruding edge 9a of the inner cylinder 9 in the vertical direction. The blockage by the bottom lid 3 has a very high sealing performance, and even if the pressure gas is sealed in the inner cylinder 9, the airtightness can be sufficiently secured.

  In addition, the outer packing 12B of the outer peripheral upper edge 3f of the annular recess 3c of the bottom lid 3 is pressed against the lower end opening edge 6g of the outer cylinder 6, and compressed between the outer peripheral upper edge 3f and the lower end opening edge 6g. The lower end opening of the outer cylinder 6 is also sealed by the bottom cover 3. As a result, the gap 7 between the outer cylinder 6 and the inner cylinder 9 is also sealed. This gap 7 is also doubled by the inner surface protrusion 6f of the outer cylinder 6 being in close contact with the outer peripheral surface of the inner cylinder 9. Sealed.

  Therefore, between the lower end opening of the inner cylinder 9 and the annular recess 3c of the bottom lid 3, there is a seal by the inner packing 12A inside the annular recess 3c and a seal by the outer packing 12B outside the annular recess 3c. It will be heavily sealed. In particular, in the outer seal structure, the outer peripheral upper edge 3f of the annular recess 3c and the lower end opening edge 6g of the outer cylinder 6 are inclined downward from the inner periphery toward the outer periphery. The seal performance tends to be reduced by the fact that the pressure tends to be less likely to accumulate and the compressive force applied to the outer packing 12B is added in three dimensions, and the pressure contact force of the lower end opening edge 6g of the outer cylinder 6 against the outer packing 12B is averaged. improves. When the downward inclination angle θ was about 20 degrees, the sealing performance was the highest.

  When the bottle cap of the present embodiment assembled as described above is attached to the mouth portion 50a of the bottle 50 such as a plastic bottle as shown in FIG. 4, the outer cylinder 6 is inserted into the bottle mouth portion 50a, The parent cap 1 is turned in the closing direction so that the female screw 5c of the cap main body 5 is screwed into the male screw 50b of the bottle mouth portion 50a, and the lock protrusion 5e of the cap body 5 of the parent cap 1 is further connected to the bottle mouth portion 50a. The parent cap 1 is further rotated in the direction of closing until the annular tooth portion 5g of the cap body 5 bites into the opening edge of the bottle mouth portion 50a, forcibly exceeding the lock collar portion 50d on the side, and the bottle mouth portion 50a. Is sealed. Thus, the parent cap 1 cannot be removed from the bottle mouth portion 50a unless a strong force is applied.

  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 the bridge 14 which is a connecting portion with the band portion 13 is cut and the band portion 13 is separated, and further, the concave portion 15a The fitting with the convex part 15b is also released.

  When the child cap 2 is further rotated, the inner cylinder 9 is also raised while rotating, but the annular recess 3c of the bottom cover 3 is in contact with the lower end opening edge 6g of the outer cylinder 6 of the parent cap 1. The bottom cover 3 is restrained from rising, while the inner cylinder 9 is further lifted, so that the bottom cover 3 is detached from the inner cylinder 9 and falls off. 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.

FIG. 3A is a perspective view and FIG. 2B is a cross-sectional view of the embodiment of the present invention before assembly. In a state where the parent cap and the child cap are assembled, (A) is a perspective view and (B) is a sectional view. Furthermore, in the state which assembled the bottom cover, (A) is a perspective view, (B) is sectional drawing. It is sectional drawing of the state with which the bottle was mounted | worn.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Parent cap 2 Child cap 3 Bottom cover 3a Pushing part 3b Annular recessed groove 3c Annular recessed part 3d Projection 3e Projection edge 3f Outer periphery upper edge 3g Concave surface 5 Cap main body 5a Top part 5b Trunk part 5c Female screw 5d Knurl 5e Lock projection part 5f Gap 5g Ring tooth part 6 Outer cylinder 6a Mouth part 6b Drooping cylinder part 6d Male thread 6e Retaining prevention part 6f Inner surface protrusion part 6g Lower end opening edge 7 Gap 8 Cap body 8a Top part 8b Body part 8e Female thread 8f Knurl 8g Arrow 9 Inner cylinder 9a Projection Edge 9b Annular groove 9c Lower end opening edge 11 Raw material 12A Inner packing 12B Outer packing 13 Band part 14 Bridge 15a Concave part 15b Convex part 50 Bottle 50a Mouth part 50b Male thread 50c Reinforcement collar part 50d Lock collar part

Claims (3)

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 an upper surface sealing the lower end opening of the inner cylinder is convex. A bottom cover having a pressing portion to be formed, and an annular convex portion is integrally formed on the periphery of the bottom lid, and a lower end portion of the inner cylinder is press-fitted between the pressing portion and the annular convex portion. An annular groove is formed, and an inner packing made of a softer material than the annular convex portion is integrally provided on the bottom surface of the annular concave groove by simultaneous molding with the annular convex portion. The upper end opening of the outer cylinder and the mouth of the bottle can be sealed by screwing the child cap onto the outer cylinder of the parent cap, and the child cap is attached to the outer cylinder of the parent cap. By turning in the opening direction, the bottom lid can be Is falling, the bottle cap material in the inner cylinder is discharged into the bottle,
Wherein an upper surface of the annular projection of the bottom lid and the lower end opening surface of the outer cylinder is tilted down direction from the inner circumference to the outer circumference,
An annular outer packing made of a softer material than the annular protrusion is integrally provided on the inclined upper surface of the annular protrusion by simultaneous molding with the annular protrusion,
The child cap screwed into the outer cylinder of the parent cap, in a state where the lower end of the inner cylinder is press-fitted into the annular groove of the bottom cover, the inclined lower end opening surface of the outer cylinder in said outer gasket is pressed A bottle cap characterized by   The bottle cap according to claim 1, wherein an inclination angle of the upper surface of the annular convex portion and the lower end opening surface of the outer cylinder is 20 degrees.   The bottle cap according to claim 1, wherein an inner peripheral surface on an upper side following a lower end edge of the outer cylinder is in close contact with an outer peripheral surface of the inner cylinder.

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