JP7749780B1 - Double-layer bottle cap - Google Patents

Abstract

To provide a cap specifically for a two-layer bottle that can efficiently adjust the air pressure inside the bottle and reliably guarantees smooth operation during the deformation and restoration process of the two-layer bottle.
[Solution] This device is used in a two-layer physically deformable bottle. Its distinctive feature is a first positioning ring surrounding the inside of the cap body. The first positioning ring abuts against a second positioning ring on the outside of the bottle mouth, leaving a small gap. Several discontinuous sections are designed on the first positioning ring, and several air vents are provided at the bottle mouth, communicating with the atmospheric pressure space inside the bottle. When the air pressure inside the bottle rises, air from the atmospheric pressure space is discharged through the air vents, the small gaps, and the discontinuous sections. Conversely, when the air pressure inside the bottle drops, outside air enters the atmospheric pressure space through the same passages. This design efficiently regulates the air pressure inside the bottle and reliably ensures smooth operation during the deformation and restoration process of the two-layer bottle.
[Selected Figure] Figure 3

Description

The present invention relates to a dedicated cap for a two-layer bottle.

The related background art for dual-layer bottles and their dedicated caps is as follows. In the following description, the numbers in parentheses are the part numbers used in the original patent documents.

China Patent No. 107922089, "Cap" (hereinafter referred to as "Document 089"). Its main function is to control the air pressure inside the container. The first internal valve (31) controls the flow between the contents and the discharge tube. The second internal valve (32) controls the inflow and outflow of outside air. Based on the pressure difference between the inside and outside of the container, the second internal valve (32) automatically opens or closes the air intake (23), thereby maintaining a stable pressure inside the container.

Chinese Patent No. 110770133, "Discharge Container" (hereinafter referred to as "Document 133"). An air intake hole (19) is provided between the outer container (12) and the inner container (11). The air valve section (41) is elastically deformable, switching between communication between the air intake hole (19) and the outside air inlet hole (34) and blocking this connection. Outside air can be drawn into the space between the outer container (12) and the inner container (11) through the outside air inlet hole (34), the outside air circulation hole (28), the communication groove (20), and the air intake hole (19). Furthermore, when the internal pressure between the outer container (12) and the inner container (11) rises to atmospheric pressure, the air valve section (41) restores its original shape, blocking the air intake hole (19) from the outside.

Taiwan Patent No. I669254, "Two-layer semi-finished product and two-layer bottle made therefrom" (hereinafter referred to as "254 document").
An atmospheric pressure space (33), an air flow path (34), and an air vent (37) are provided between the inner bottle (31) and the outer bottle (32). When the check bottle cap (60) is opened and the outer bottle (32) is pressed, the contents are poured from the inner bottle (31) through the spout (62) and the bottle cap (60) to the outside. At this time, the air in the atmospheric pressure space (33) is released to the outside through the air flow path (34) and the air vent (37) due to the pressure. When the pressure is released, the valve plate (61) seals the spout (62) due to external air pressure, and outside air enters the atmospheric pressure space (33) through the air vent (37) and the air flow path (34). This causes the outer bottle (32) to expand until it returns to its original state, and the air pressure present in the atmospheric pressure space (33) maintains the inner bottle (31) in its volumetrically deformed state.

Chinese Utility Model Publication No. 216003681, "One-way sealed two-layer bottle" (hereinafter referred to as "Document 681").
The bottle includes a soft inner bottle body (2) and an outer bottle body (1) that can be compressed and can be restored to its original state after the compression is released. A gap cavity (7) is formed between the inner bottle body (2) and the outer bottle body (1), and the gap cavity (7) forms a gap opening on one side of the inner bottle body (2) and the outer bottle body (1). A cover (4) covers the bottle mouth of the inner bottle body (2), and the side wall of the cover (4) covers the gap opening. Several second recesses (41) are formed on the inside of the side wall of the cover (4) to allow outside air to enter the gap cavity (7). A rubber ring (5) is wound on the side wall near the gap opening. When the outer bottle body (1) is compressed, the rubber ring (5) seals the gap opening, preventing air from escaping through the gap opening. After the outer bottle body (1) is released from compression, air is allowed to enter the gap cavity (7) in one direction.

Chinese Patent No. 107922089 Chinese Patent No. 110770133 Taiwan Patent No. I669254 China Utility Model Publication No. 216003681

Unlike the above-mentioned prior art, the present invention provides a new type of cap specifically for dual-layer bottles.

The technical features of this invention are as follows:

A cap specifically for a two-layer bottle, the cap is attached to the mouth of the two-layer bottle, the two-layer bottle including an outer-layer bottle that is physically deformable and reversible, an inner-layer bottle that is physically deformable inside the outer-layer bottle, and an atmospheric pressure space between the inner-layer bottle and the outer-layer bottle. The cap includes a central pouring hole and a check valve used to seal or open the central pouring hole, and has the following features:

The first positioning ring is attached to the inner wall of the cap body of the dedicated cap, surrounding it. The first positioning ring abuts against the second positioning ring, which surrounds the outer wall of the bottle mouth. There is a small gap between the inner wall and the second positioning ring. The first positioning ring has several discontinuous portions.

Several air vents are provided in the bottle mouth above the second positioning ring, and these air vents communicate with the atmospheric pressure space.

If the air pressure in the atmospheric pressure space changes and becomes higher than atmospheric pressure, the air in the atmospheric pressure space is discharged to the outside through the air vent, the small gap, and the discontinuous portion.

If the air pressure in the atmospheric pressure space changes and becomes lower than atmospheric pressure, outside air will enter the atmospheric pressure space through the discontinuity, the small gap, and the air vent.

In an embodiment of the present invention, the bottle mouth comprises a first bottle mouth molded on the inner bottle and a second bottle mouth molded on the outer bottle. The first bottle mouth is provided with an external thread, and the second bottle mouth is provided with the second positioning ring. The inner wall of the cap body is provided with an internal thread, and the internal thread and the external thread are coupled together to fasten the bottle.

The effects of the present invention are as follows:

Air pressure regulation: The design of small gaps and discontinuous sections allows the air pressure inside the bottle to quickly equalize, efficiently regulating the air pressure inside the bottle, ensuring smooth operation during the deformation and restoration process of the double-layer bottle and preventing damage to the bottle body.

Compared to prior art, the advantages of this invention are as follows:

Compared to the prior art (Patent Document 089), the dedicated cap of the present invention does not require the installation of components such as the air intake and second internal valve of Prior Art Document 089, or similar components. Compared to Prior Art Document 133, the dedicated cap of the present invention does not require the installation of components such as the air valve and external air intake hole of Prior Art Document 133, or similar components. The structure of the dedicated cap of the present invention is simpler than that of the prior art.

While prior documents (Document 089) (Document 133) control air entry and discharge from the top of the cap, the present invention allows air to enter and discharge from the bottom of the special cap. When controlling air entry and discharge from the top of the cap, the air entry and discharge route involves the threads on the cap and bottle neck, making the air entry and discharge route long and the threads slightly obstructing the air route, which can result in problems with slow air entry and discharge. The special cap of the present invention allows air to enter and discharge from the bottom, which does not involve the threads on the cap and bottle neck, making the air entry and discharge route short and allowing for smooth air entry and discharge.

The caps in the prior documents (Document 089) and (Document 133) are mated with the threads on the bottle mouth of the outer layer bottle. The dedicated cap of the present invention and the bottle mouth of the dual-layer bottle have two positioning mechanisms: the first is the connection between the internal threads of the dedicated cap and the external threads on the bottle mouth of the inner layer bottle, and the second is the connection between the first positioning ring and the second positioning ring on the bottle mouth of the outer layer bottle. The dedicated cap of the present invention is positioned and mated with both the bottle mouths of the inner layer bottle and the outer layer bottle.

The bottle body in the prior art document (Document 254) does not cover the air vent (part number 37) of the dual-layer bottle, making it easy for external foreign objects to block the air vent, thereby preventing air from entering and escaping from the dual-layer bottle. The dedicated cap of the present invention covers the air vent, effectively preventing the problem of external foreign objects blocking the air vent, thereby ensuring smooth and unobstructed air entry and exit from the dual-layer bottle.

The prior art document (Document 681) allows outside air to enter the cavity between the inner and outer bottles only through the second recess (part number 41) in the bottom of the cap, but does not allow air within the cavity to be expelled when the bottles are compressed. The dedicated cap of the present invention allows outside air to enter the atmospheric pressure space between the inner and outer bottles from the bottom of the dedicated cap, and also allows air within the atmospheric pressure space to be expelled from the bottom of the dedicated cap when compressed.

1 is a top view of a two-layer bottle cap according to the present invention; FIG. FIG. 2 is an exploded view of the dedicated cap of FIG. 1; FIG. 2 is a three-dimensional external view of the dedicated cap of FIG. 1 as seen from below. FIG. 2 is a vertical cross-sectional view of the dedicated cap of FIG. 1. 1 is a vertical cross-sectional view of the dedicated cap of the present invention joined to the bottle mouth of a two-layer bottle. FIG. FIG. 6 is a partial enlarged view of FIG. 5 . This is a vertical cross-sectional view of the dedicated cap of the present invention joined to the bottle mouth, illustrating how air is expelled from inside the bottle. This is a vertical cross-sectional view of the dedicated cap of the present invention joined to the bottle mouth, illustrating the intrusion of air into the bottle. 1 is a schematic diagram of the combination of the special cap of the present invention with a two-layer bottle, illustrating the exhaustion of internal air. 1 is a schematic diagram of the combination of the special cap of the present invention with a two-layer bottle, illustrating the intrusion of air into the bottle.

To facilitate explanation of the gist of the present invention as set forth in the above description of the invention, examples will now be provided. It should be noted that the various different articles in the examples are depicted based on proportions, dimensions, deformations, or displacements appropriate for the explanation, but are not drawn based on the actual proportions of the parts. Furthermore, in the following description, parts that are similarly and symmetrically arranged will be designated by the same numbers.

As shown in Figures 1 to 4, the dual-layer bottle cap of the present invention includes a cap body 10, a hinged lid 1 connected to the cap body 10, a check valve 20 provided on the cap body 10, and a spout 30 provided on the check valve 20 and fixed to the cap body 10.

The cap body 10 is a molded plastic part and includes a top portion 101 and a body portion 102 that is connected perpendicularly to the circumference of the top portion 101. The body portion 102 has an inner wall 11 that is provided with an internal thread 12, and a first positioning ring 13 that is provided near the bottom end of the inner wall 11 of the body portion 102. The first positioning ring 13 has several discontinuous portions 131. The top portion 101 is concentrically surrounded by an annular side wall 16 and a separation wall 17. The separation wall 17 surrounds a bearing surface 18, and an annular mounting groove 19 is formed between the separation wall 17 and the bearing surface 18. The inner ring of the annular side wall 16 has a concave first locking portion 161. The bearing surface 18 has a central pouring hole 181.

The check valve 20 is made of an elastic plastic molded part that is physically deformable and recovers to its original shape. The check valve 20 includes an annular base 21 that is connected to and surrounds a film-like valve plate 22. The valve plate 22 has elasticity that allows it to move up and down, and several peripheral pouring holes 23 are formed around the periphery of the valve plate 22. The check valve 20 is attached to the annular mounting groove 19 of the cap body 10 by the annular base 21, and the valve plate 22 forms a downward concave arc that contacts the support surface 18 and closes the central pouring hole 181.

The spout 30 is a molded plastic part and includes a horizontal cover 31, an annular recessed wall 32 molded near the center of the bottom surface of the cover 31, an annular engagement wall 33 molded near the periphery of the bottom surface of the cover 31, and a spout 35 molded to protrude upward from the center of the cover 31.

A protruding second locking portion 331 is provided on the outer surface of the annular engagement wall 33. The spouting portion 30 locks onto the first locking portion 161 via the second locking portion 331, connecting and fixing the spouting portion 30 to the cap body 10. The annular insertion wall 32 of the spouting portion 30 presses against the annular base 21, ensuring that the check valve 20 is fixed between the cap body 10 and the spouting portion 30.

As shown in Figures 5 and 6, the dedicated cap is attached to the bottle mouth 50 of the two-layer bottle.

The two-layer bottle includes an outer bottle 42 that is physically deformable and reversible. The outer bottle 42 contains an inner bottle 41 that is also physically deformable, and an atmospheric pressure space 43 is provided between the inner bottle 41 and the outer bottle 42. The outer bottle 42 has several air vents 44 that communicate with the outside, and each of the air vents 44 communicates with the atmospheric pressure space 43. The bottle mouth 50 is composed of a first bottle mouth 45 molded on the inner bottle 41 and a second bottle mouth 47 molded on the outer bottle 42. The first bottle mouth 45 has an external thread 46, and the second bottle mouth 47 has a second positioning ring 48. The air vent 44 is located above the second positioning ring 48.

The internal thread 12 and external thread 46 of the dedicated cap are mated and tightened, and the first positioning ring 13 of the dedicated cap abuts the second positioning ring 48, thereby mating and positioning the dedicated cap with the first bottle mouth 45 and the second bottle mouth 47. The inner wall 11 of the cap body 10 blocks the air vent 44. There is a small gap 49 between the inner wall 11 of the dedicated cap and the second positioning ring 48. The valve plate 22 of the check valve 20 is tightly attached to the support surface 18 of the cap body 10, closing both the central injection hole 181 and the peripheral injection holes 23, preventing outside air from entering the inner bottle 41.

As shown in Figures 7 to 10, when the outer bottle 42 is pressed, the inner bottle 41 is also pressed at the same time, causing both the outer bottle 42 and the inner bottle 41 to shrink and deform. When the air pressure in the atmospheric pressure space 43 changes and becomes higher than atmospheric pressure, the air in the atmospheric pressure space 43 is discharged to the outside through the air vent 44, the small gap 49, and the discontinuous portion 131. When the inner bottle 41 is subjected to pressure and undergoes volumetric deformation, the contents 60 (represented by an arrow filled with fine dots) press against the valve plate 22 through the central pouring hole 181 of the cap body 10, causing the valve plate 22 to elastically deform, bend, and rise up, separating from the support surface 18. The bent and raised valve plate 22 opens the central pouring hole 181 and the peripheral pouring holes 23, allowing the contents 60 to be released through the peripheral pouring holes 23 toward the pouring outlet 35.

When the pressure on the outer bottle 42 is released and the air pressure in the atmospheric pressure space 43 drops below atmospheric pressure, outside air is injected into the atmospheric pressure space 43 through the discontinuous portion 131, the small gap 49, and the air vent 44, filling the atmospheric pressure space 43. When the release of the contents of the inner bottle 41 to the outside stops, the outside air pressure restores the valve plate 22 to its original state of being attached to the support surface 18, sealing the central injection hole 181 and the peripheral injection holes 23, preventing outside air from entering the inner bottle 41. The inner bottle 41 does not recover from its volumetric deformation due to its thin wall, the release of the contents, and the air pressure in the atmospheric pressure space 43. By repeatedly compressing and releasing the outer bottle 42, the contents are pushed out of the inner bottle 41, eventually resulting in a nearly empty bottle.

1 Hinged cap 10 Cap body 101 Top portion 102 Body portion 11 Inner wall 12 Internal thread 13 First positioning ring 131 Discontinuous portion 16 Annular side wall 161 First locking portion 17 Separation wall 18 Support surface 181 Central pouring hole 19 Annular mounting groove 20 Check valve 21 Annular base 22 Valve plate 23 Peripheral pouring hole 30 Pour portion 31 Cover portion 32 Annular insertion wall 33 Annular engagement wall 331 Second locking portion 35 Pour outlet 41 Inner layer bottle 42 Outer layer bottle 421 Outer wall 43 Atmospheric pressure space 44 Air vent 45 First bottle mouth portion 46 External thread 47 Second bottle mouth portion 48 Second positioning ring 49 Slight gap 50 Bottle mouth portion 60 Contents

Claims (6)

A cap for a two-layer bottle, the cap being attached to the mouth of the two-layer bottle, the two-layer bottle including an outer-layer bottle that is physically deformable and recoverable to its original state, the outer-layer bottle having an inner-layer bottle that is physically deformable inside, an atmospheric pressure space between the inner-layer bottle and the outer-layer bottle, the cap including a central pouring hole and a check valve used to seal or open the central pouring hole,
a first positioning ring provided around the inner wall of the cap body of the dedicated cap and abutting against a second positioning ring surrounding the outer wall of the bottle mouth portion, with a small gap between the inner wall and the second positioning ring and with several discontinuous portions;
several air vents are provided at the bottle mouth above the second positioning ring, and the air vents communicate with the atmospheric pressure space;
When the air pressure in the atmospheric pressure space changes and becomes higher than atmospheric pressure, the air in the atmospheric pressure space is discharged to the outside through the air vent, the small gap, and the discontinuous portion,
When the air pressure in the atmospheric pressure space changes and becomes lower than atmospheric pressure, outside air enters the atmospheric pressure space through the discontinuous portion, the small gap, and the air vent.
A cap designed specifically for double-layered bottles. The cap for a dual-layer bottle according to claim 1, wherein the bottle mouth is composed of a first bottle mouth molded on the inner layer bottle and a second bottle mouth molded on the outer layer bottle, the first bottle mouth having an external thread, the second bottle mouth having the second positioning ring, and the inner wall of the cap body having an internal thread that is coupled with the external thread for fastening. The cap for a two-layer bottle according to claim 1, wherein a support surface is provided on the top of the cap body, the support surface is provided with the central pouring hole, the check valve is attached to the top, the check valve includes a valve plate that can elastically deform up and down, the valve plate is used to seal or open the central pouring hole, and several peripheral pouring holes are provided on the periphery of the valve plate. The two-layer bottle cap described in claim 3, wherein a pouring portion is provided above the check valve and fixed to the top, and the pouring portion is provided with a pouring outlet. The cap for a two-layer bottle according to claim 4, wherein the pouring portion includes a cover portion and an annular engagement wall molded at the peripheral position of the bottom surface of the cover portion, the pouring outlet is provided in the cover portion, an annular side wall is provided at the top, a second locking portion is provided on the outer surface of the annular engagement wall, and a first locking portion is provided on the inner surface of the annular side wall, the second locking portion is coupled to the first locking portion, and the pouring portion is coupled and fixed to the cap body. A two-layer bottle cap as described in claim 5, wherein a separation wall is provided on the top surface of the cap body so as to be concentric with the annular side wall, an annular mounting groove is formed between the separation wall and the support surface, the check valve includes an annular base that is mounted within the annular mounting groove, and the bottom surface of the cover portion of the spout portion has an annular fitting wall that presses against the annular base.