Double-layer bottle cap

Abstract

To provide a cap exclusively for a two-layered bottle, which can efficiently adjust the air pressure inside the bottle and reliably guarantees smooth operation in the process of deformation and restoration of the two-layered 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.

Description

[Technical Field]

[0001] The present invention relates to a dedicated cap for a two-layer bottle. [Background technology]

[0002] The related background art of the two-layer bottle and its dedicated cap is as follows: In the following description, the numbers in parentheses are the part numbers of the original patent documents.

[0003] Chinese 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 inlet (23), thereby maintaining a stable pressure inside the container.

[0004] Chinese Patent No. 110770133, "Discharge Container" (hereinafter referred to as "Document 133"). An air intake hole (19) is provided between an outer container (12) and an inner container (11). An air valve section (41) is elastically deformable, and switches between communication between the air intake hole (19) and an outside air inlet hole (34) and blocking the communication. 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). 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.

[0005] Taiwan Patent No. I669254, "Two-layer semi-finished product and two-layer bottle made therefrom" (hereinafter referred to as "Document 254"). 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. At this time, the pressure causes air in the atmospheric pressure space 33 to be expelled through the air flow path 34 and the air vent 37. 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 in the atmospheric pressure space 33 maintains the inner bottle 31 in its reduced, deformed state.

[0006] 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. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Chinese Patent No. 107922089 [Patent Document 2] Chinese Patent No. 110770133 [Patent Document 3] Taiwan Patent No. I669254 [Patent Document 4] China Utility Model Publication No. 216003681 Summary of the Invention

[0008] Unlike the above-mentioned prior art documents, the present invention provides a new type of double-layer bottle cap.

[0009] The technical features of the present invention are as follows:

[0010] A cap for a dual-layer bottle, the cap being attached to the mouth of the dual-layer bottle, the dual-layer bottle including an outer-layer bottle capable of physical deformation and recovery, an inner-layer bottle inside the outer-layer bottle capable of physical deformation, 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:

[0011] The first positioning ring is provided around the inner wall of the cap body of the dedicated cap. The first positioning ring abuts against a second positioning ring that 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.

[0012] A number of air vents are provided in the bottle mouth above the second positioning ring, and the air vents communicate with the atmospheric pressure space.

[0013] 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.

[0014] 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.

[0015] 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 mouth. [Effects of the Invention]

[0016] The effects of the present invention are as follows.

[0017] Air pressure regulation: The design of small gaps and discontinuous sections allows the air pressure inside the bottle to be quickly equalized, effectively 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.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] Compared with 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 the prior art (Patent Document 089) or similar components. Compared with the prior art (Patent 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 the prior art (Patent Document 133) or similar components. The structure of the dedicated cap of the present invention is simpler than that of the prior art.

[0020] While the prior art (Reference 089) (Reference 133) controls air entry and discharge from the top of the cap, the present invention controls air entry 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 controls air entry 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.

[0021] The caps in the prior art (Document 089) (Document 133) are connected to 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 connected to both the bottle mouths of the inner layer bottle and the outer layer bottle.

[0022] The bottle body of the prior art (Reference 254) does not cover the air vent (part number 37) of the dual-layer bottle, which makes 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 and effectively prevents the problem of external foreign objects blocking the air vent, thereby ensuring smooth and unobstructed air entry and exit from the dual-layer bottle.

[0023] The prior art (Patent Document 681) allows outside air to enter the cavity between the inner and outer bottles only through the second recess (part number 41) at the bottom of the cap, but does not allow the air in 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 the air in the atmospheric pressure space to be expelled from the bottom of the dedicated cap when compressed. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a top view of a two-layer bottle cap according to the present invention; FIG. [Figure 2] FIG. 2 is an exploded view of the dedicated cap of FIG. 1. [Figure 3] FIG. 2 is a three-dimensional external view of the dedicated cap of FIG. 1 as seen from below. [Figure 4] FIG. 2 is a vertical cross-sectional view of the dedicated cap of FIG. 1. [Figure 5] 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. [Figure 6] FIG. 6 is a partially enlarged view of FIG. 5. [Figure 7] 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. [Figure 8] 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. [Figure 9] 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. [Figure 10] 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. DETAILED DESCRIPTION OF THE INVENTION

[0025] In order to facilitate the explanation of the gist of the present invention as set forth in the above description of the invention, the present invention will now be described by way of examples. It should be noted that the various different articles in the examples are depicted based on the proportions, dimensions, deformation amounts, or displacement amounts appropriate for the explanation, but are not depicted based on the actual proportions of the parts. Furthermore, in the following description, parts arranged in the same or symmetrical manner are designated by the same reference numerals.

[0026] As shown in Figures 1 to 4, the cap for a two-layer bottle 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.

[0027] 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 provided with 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.

[0028] The check valve 20 is made of an elastic plastic molded part that can be physically deformed and restored 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 provided on the periphery of the valve plate 22. The check valve 20 is mounted in 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.

[0029] The spout 30 is a plastic molded part and includes a horizontal cover portion 31, an annular recessed wall 32 molded near the center of the bottom surface of the cover portion 31, an annular engagement wall 33 molded near the periphery of the bottom surface of the cover portion 31, and a spout 35 molded to protrude upward from the center of the cover portion 31.

[0030] A protruding second locking portion 331 is provided on the outer surface of the annular engagement wall 33. The spouting portion 30 locks the first locking portion 161 by the second locking portion 331, thereby connecting and fixing the spouting portion 30 and the cap body 10. The annular fitting wall 32 of the spouting portion 30 presses the annular base 21, so that the check valve 20 is fixed between the cap body 10 and the spouting portion 30.

[0031] As shown in Figures 5 and 6, the dedicated cap is coupled to the bottle mouth 50 of the two-layer bottle.

[0032] The two-layer bottle includes an outer-layer bottle 42 that is physically deformable and recoverable, a physically deformable inner-layer bottle 41 inside the outer-layer bottle 42, and an atmospheric pressure space 43 between the inner-layer bottle 41 and the outer-layer bottle 42. The outer-layer 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-layer bottle 41 and a second bottle mouth 47 molded on the outer-layer 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.

[0033] The internal thread 12 and the external thread 46 of the dedicated cap are mated and tightened, and the first positioning ring 13 of the dedicated cap abuts against 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 the central pouring hole 181 and the peripheral pouring holes 23, preventing outside air from entering the inner bottle 41.

[0034] 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 and separate from the support surface 18. The bent and raised valve plate 22 opens the central pouring hole 181 and the peripheral pouring holes 23, and the contents 60 are released through the peripheral pouring holes 23 toward the pouring outlet 35.

[0035] When the pressure on the outer bottle 42 is released and the air pressure in the atmospheric space 43 drops below atmospheric pressure, ambient air is injected into the atmospheric space 43 through the discontinuous portion 131, the small gap 49, and the air vent 44, filling the atmospheric space 43 with air. When the release of the contents of the inner bottle 41 to the outside is stopped, the ambient air pressure returns the valve plate 22 to its original state of adhering to the support surface 18, sealing the central injection hole 181 and the peripheral injection holes 23, preventing ambient 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 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. [Explanation of symbols]

[0036] 1 hinged cap 10 Cap body 101 Top 102 Torso 11 Inner wall 12 internal threads 13 First positioning ring 131 Discontinuous section 16 Annular sidewall 161 First locking part 17 Separation wall 18 Bearing surface 181 Center spout hole 19 Annular mounting groove 20. Check valve 21 Circular Base 22 Valve plate 23 Peripheral injection hole 30 Pour section 31 Cover 32 Annular inset wall 33 Annular engagement wall 331 Second locking part 35 spout 41 Inner bottle 42 outer bottle 421 Outside wall 43 Atmospheric pressure space 44 Air vent 45 First bottle mouth 46 external thread 47 Second bottle mouth 48 Second positioning ring 49 A small gap 50 Bottle mouth 60 Contents

Claims

1. 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.

2. 2. The cap for a two-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, the internal thread and the external thread being coupled together to fasten the bottle.

3. 2. The cap for a two-layer bottle according to claim 1, wherein a support surface is provided at 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.

4. The two-layer bottle cap according to claim 3, wherein a pouring portion is provided on the check valve and fixed to the top, and the pouring portion is provided with a pouring outlet.

5. 5. 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 a peripheral position of a bottom surface of the cover portion, the pouring outlet is provided in the cover portion, the top is provided with an annular side wall, a second locking portion is provided on an outer surface of the annular engagement wall, and a first locking portion is provided on an inner surface of the annular side wall, the second locking portion is connected to the first locking portion, and the pouring portion is connected to and fixed with the cap body.

6. 6. The cap for a two-layer bottle according to claim 5, wherein a separating 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 separating wall and the support surface, the check valve includes an annular base, the annular base is mounted in the annular mounting groove, and the bottom surface of the cover part of the spout part has an annular fitting wall, which presses against the annular base.

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