Lightweight bottle cap

Abstract

The utility model provides a kind of light-weight bottle cap, by setting inside inner sealing ring, outer sealing ring and hollow protruding piece in bottle cap top surface inside, multiple sealing structure is realized.Inner sealing ring is tightly abutted with the inner wall of the mouth of bottle, outer sealing ring is attached with the outside wall of the top of mouth, so that the mouth forms double sealing inside and outside in the state of screwing, effectively prevent liquid leakage;Two hollow protruding pieces hold the top surface of mouth, since the hollow structure of hollow protruding piece can produce certain elastic deformation when stressed, so as to buffer the pressure fluctuation produced in assembly process or use, reduce the stress concentration of mouth and bottle cap, improve sealing stability.Meanwhile, the maximum diameter of the protrusion of inner sealing ring close to the side of bottle cap mouth is slightly larger than the protrusion of the side away from bottle cap mouth, can realize preliminary sealing in the initial stage of screwing, and further produce secondary sealing with screwing, form hierarchical sealing structure.Therefore, the sealing performance, assembly reliability and use safety of the application are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of bottle cap technology, specifically a lightweight bottle cap. Background Technology

[0002] Bottle caps, as an important component of beverage bottles, medicine bottles, and other packaging containers, primarily function to reliably seal the bottle opening, preventing leakage of contents and the entry of external impurities, while ensuring good performance during opening and resealing. Existing bottle cap structures typically consist of a cap body and a tamper-evident ring. The cap body engages with the bottle opening via internal threads to achieve a seal, while the tamper-evident ring prevents premature opening, ensuring the integrity of the product during distribution and use.

[0003] However, existing bottle caps still have significant shortcomings in terms of sealing strength. On the one hand, most common bottle caps use a single sealing ring or a simple contact surface structure, resulting in uneven stress on the sealing surface. This makes them prone to leaks during prolonged storage or after external impact. On the other hand, to improve sealing performance, existing technologies often increase the cap wall thickness or enlarge the sealing ring size. However, this not only increases material consumption and production costs but also limits the possibility of lightweight bottle caps. Therefore, improving the sealing reliability and economy of bottle caps has become a problem for those skilled in the art to solve. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a lightweight bottle cap that effectively improves upon the poor sealing reliability of some traditional bottle caps.

[0005] A lightweight bottle cap includes a cap body and an anti-theft ring. The cap body includes a top surface and a side wall connected to the top surface. The end of the side wall away from the top surface forms a cap opening. The inner wall of the side wall has internal threads. An inner sealing ring, an outer sealing ring, and two hollow protrusions protrude from the inner side wall of the top surface towards the cap opening. The inner sealing ring includes an inner sealing ring body and two protrusions on the inner sealing ring body near the side wall. The protrusions near the cap opening are connected to the inner sealing ring body in an arc-shaped manner, and the maximum protrusion diameter of the protrusion near the cap opening is slightly larger than that of the protrusion away from the cap. The maximum protruding diameter of the protrusion on one side of the opening; the outer sealing ring is disposed between the inner sealing ring and the side wall of the bottle cap, and the outer sealing ring is configured as an arc bending towards the side wall of the bottle cap within a predetermined distance from the side near the bottle cap opening to the side away from the bottle cap opening, and a recessed groove is provided between the outer sealing ring and the side wall of the bottle cap, recessed towards the top surface of the bottle cap; two hollow protrusions are disposed between the inner sealing ring and the outer sealing ring, the two hollow protrusions are connected and a spring-loaded component is provided inside the hollow protrusion; the anti-theft ring is connected and disposed on the side wall of the bottle cap away from the top surface of the bottle cap, and multiple protrusions are spaced apart on the inner peripheral wall of the anti-theft ring, and connecting ribs are provided between the protrusions.

[0006] Preferably, the bottle cap body and the anti-theft ring are connected by a connecting bridge with a break point.

[0007] Furthermore, the internal thread is configured as a uniformly distributed three-thread thread.

[0008] Preferably, the protrusion is an arc-shaped protrusion or a triangular protrusion with an arc-shaped tip.

[0009] Preferably, the connection point between the two hollow protrusions is configured as a V-shaped groove.

[0010] Preferably, the connection between the two protrusions is configured as an arc-shaped groove, and an annular rubber ring is provided at the arc-shaped groove.

[0011] Preferably, the outer wall of the bottle cap sidewall is provided with several vertical reinforcing ribs.

[0012] Preferably, the two hollow protrusions are V-shaped hollow protrusions with internal hollow interiors.

[0013] Preferably, the sidewall of the bottle cap adopts a variable thickness design, wherein the thickness of the stress-bearing area with internal threads is greater than the thickness of the non-stress-bearing area without internal threads.

[0014] Preferably, the top surface of the bottle cap includes a relatively thinned first top plate area and a relatively thickened second top plate area. The first top plate area is the annular portion of the top surface of the bottle cap, and the second top plate area is an arc-shaped transition area located near the sidewall of the bottle cap. An X-shaped reinforcing structure for enhancing load-bearing capacity is formed on the inner side of the first top plate area. The thickness of the first top plate area is 0.4 to 0.8 times the thickness of the stress-bearing area.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a lightweight bottle cap that achieves a multi-layered sealing and buffering structure by incorporating an inner sealing ring, an outer sealing ring, and hollow protrusions on the inner side of the cap's top surface. The inner sealing ring abuts tightly against the inner wall of the bottle opening, while the outer sealing ring fits against the outer wall of the top side of the bottle opening, creating a double seal when the bottle opening is tightened, effectively preventing liquid leakage. The two hollow protrusions clamp the top surface of the bottle opening. The hollow structure of these protrusions allows for elastic deformation under stress, buffering pressure fluctuations during assembly or use, reducing stress concentration on the bottle opening and cap, and improving sealing stability. Furthermore, the protrusion on the inner sealing ring closer to the cap opening has a slightly larger maximum diameter than the protrusion further away, enabling initial sealing at the initial tightening stage and further secondary sealing as tightening progresses, forming a graded sealing structure that improves sealing reliability. The interaction between the two protrusions also distributes the pressure during tightening, resulting in a lower torque required for the cap to achieve a good seal. Meanwhile, the anti-theft ring, combined with the protrusion and connecting rib structure, provides protection against detachment during bottle cap opening or transportation, ensuring a secure connection between the cap and the bottle. Therefore, this application significantly improves the sealing performance, assembly reliability, and safety of the bottle cap, making it particularly suitable for lightweight bottle cap design requirements. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the lightweight bottle cap described in this utility model; Figure 2 This is a side view of the bottle cap body of the present invention. Figure 3 This is a schematic diagram of the structure of the bottle cap body described in this utility model; Figure 4 This is a partial cross-sectional structural diagram of the top corner of the bottle cap body described in this utility model.

[0017] in: 10-Bottle cap body, 20-Anti-theft ring, 11-Top surface of bottle cap, 12-Side wall of bottle cap, 13-Internal thread, 14-Inner sealing ring, 15-Outer sealing ring, 16-Hollow protrusion, 17-Recessed groove, 18-Vertical reinforcing rib, 141-Inner sealing ring body, 142-Protrusion, 143-Arc-shaped connecting part, 144-Arc-shaped groove, 111-First top plate area, 112-Second top plate area, 21-Protrusion, 22-Connecting rib. Detailed Implementation

[0018] The embodiments described below are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0019] See Figures 1-4 This embodiment provides a lightweight bottle cap, comprising a bottle cap body 10 and an anti-theft ring 20.

[0020] Specifically, the bottle cap body 10 includes a bottle cap top surface 11 and a bottle cap side wall 12 connected to the bottle cap top surface 11. The end of the bottle cap side wall 12 away from the bottle cap top surface 11 forms a bottle cap opening. The inner wall of the bottle cap side wall 12 is provided with an internal thread 13. The inner side wall of the bottle cap top surface 11 protrudes towards the bottle cap opening and is provided with an inner sealing ring 14, an outer sealing ring 15, and two hollow protrusions 16.

[0021] In this application, the inner sealing ring 14 includes an inner sealing ring body 141 and two protrusions 142 disposed on the side of the inner sealing ring body 141 near the bottle cap sidewall 12. The protrusion 142 near the bottle cap opening is connected to the inner sealing ring body 141 by an arc-shaped connection portion 143, and the maximum protrusion diameter of the protrusion 142 near the bottle cap opening is slightly larger than the maximum protrusion diameter of the protrusion 142 away from the bottle cap opening; the outer sealing ring 15 is disposed on the inner sealing ring 141. 4. Between the bottle cap sidewall 12 and the outer sealing ring 15, the outer sealing ring 15 is set in an arc shape bent towards the bottle cap sidewall 12 within a predetermined distance from the side near the bottle cap opening to the side away from the bottle cap opening. A recessed groove 17 is provided between the outer sealing ring 15 and the bottle cap sidewall 12, which is recessed towards the top surface 11 of the bottle cap. Two hollow protrusions 16 are provided between the inner sealing ring 14 and the outer sealing ring 15. The two hollow protrusions 16 are connected and a spring-loaded component is provided inside the hollow protrusion 16.

[0022] Specifically, the anti-theft ring 20 is connected to the side of the bottle cap sidewall 12 away from the top surface 11 of the bottle cap. Multiple protrusions 21 are spaced apart on the inner peripheral wall of the anti-theft ring 20, and connecting ribs 22 are provided between the protrusions 21. The protrusions 21 engage with the bottom of the bottle neck, thereby achieving connection when the bottle cap is installed with the bottle neck. This ensures that the anti-theft ring 20 can be reliably held on the side of the bottle cap sidewall 12 away from the top surface 11 of the bottle cap, preventing the bottle cap from accidentally falling off during opening or transportation. Simultaneously, the connecting ribs 22 between the protrusions 21 not only enhance the overall strength and toughness of the anti-theft ring 20, but also act as a buffer when the bottle cap is subjected to force, ensuring a stable fit between the anti-theft ring 20 and the bottle cap, and improving safety and durability.

[0023] It should be noted that the inner sealing ring 14 of this application, by providing two protrusions 142, with the protrusion 142 closer to the bottle cap opening being slightly larger than the protrusion 142 further away from the bottle cap opening, allows the bottle cap to achieve a gradual seal during the tightening process. The protrusion 142 closer to the bottle opening first contacts the inner wall of the bottle opening, forming an initial seal, while the protrusion 142 further strengthens the sealing effect, thereby effectively improving the overall sealing reliability. Compared to a structure with only one protrusion 142, this design can disperse the axial pressure during tightening, reduce local stress concentration, and avoid excessive force at a single point leading to seal failure or material damage. At the same time, the gradual sealing by the two protrusions 142 can also adapt to minor differences in bottle opening size or slight deformation, improving sealing stability and leak-proof performance. Furthermore, the arc-shaped connection 143 between the two protrusions 142 provides cushioning, enhances elasticity and adaptability, makes the opening and closing process smoother, and extends the service life of the seal. Furthermore, the difference between the maximum protrusion diameter of the protrusion 142 on the side of the bottle cap opening and the maximum protrusion diameter of the protrusion 142 on the side away from the bottle cap opening is 0.2 mm to 0.6 mm. This design enables a gradual seal when tightening the bottle cap. The protrusion 142 closer to the bottle opening first forms an initial seal, and then the protrusion 142 further away from the bottle opening further enhances the sealing effect, effectively preventing excessive deformation of the sealing ring or localized stress concentration. Compared to using two identical protrusions 142, this structure not only avoids localized stress concentration caused by excessive instantaneous contact pressure, but also improves sealing reliability, enhances the tightening feel, and extends the service life of the seal.

[0024] Preferably, the bottle cap body 10 and the anti-theft ring 20 are connected by a connecting bridge with a break point. The connecting bridge with the break point allows the bridge to break when the user first opens the bottle cap, thereby separating the anti-theft ring 20 from the bottle cap body 10. This ensures the initial sealing security of the bottle cap body 10, facilitates subsequent normal opening and use by the user, and avoids damage to the overall structure, thus improving the reliability of the bottle cap and the user experience.

[0025] Furthermore, the internal thread 13 is configured as a uniformly distributed three-thread thread. The three-thread structure can significantly increase the lead under the same pitch conditions, reducing the number of rotations required for tightening and improving assembly efficiency; the multiple evenly distributed engagement points can more evenly transmit the axial preload to the top surface 11 of the cap and the sealing structure, reducing local stress and the risk of jamming, thereby reducing the opening / tightening torque and improving the smoothness of repeated opening and closing.

[0026] Preferably, the protrusion 142 is an arc-shaped protrusion 142 or a triangular protrusion 142 with an arc-shaped tip. This allows for smooth contact with the inner wall of the bottle opening during the tightening process of the bottle cap, reducing friction and stress concentration, and preventing damage to the sealing ring or scratches on the bottle opening. At the same time, the arc-shaped design provides a certain degree of cushioning and elasticity, adapting to slight differences in the size of the bottle opening, thereby improving sealing reliability and service life.

[0027] Preferably, the connection between the two protrusions 142 is configured as an arc-shaped groove 144, and an annular rubber ring is provided at the arc-shaped groove 144. This significantly enhances the sealing performance between the bottle cap and the bottle mouth. The annular rubber ring forms a tight sealing surface when the bottle cap contacts the bottle mouth, effectively preventing liquid leakage or evaporation. Simultaneously, the arc-shaped groove 144 between the protrusions 142 provides good structural guidance and connection support for the bottle cap, ensuring that the bottle cap maintains a stable position during tightening or fastening, preventing tilting or misalignment. The elasticity and friction of the rubber ring make the bottle cap smoother and more controllable during rotation or fastening, improving user comfort and adapting to deformation under different temperature and pressure conditions, maintaining long-term effective sealing and cushioning performance, suitable for various usage environments, thereby comprehensively improving the stability, durability, and user experience of the bottle cap structure.

[0028] Preferably, the outer wall of the bottle cap sidewall 12 is provided with a plurality of vertical reinforcing ribs 18. This enhances the structural strength and deformation resistance of the bottle cap sidewall 12, prevents deformation caused by external forces during opening or tightening, and improves the durability and stability of the bottle cap during long-term use.

[0029] Preferably, the two hollow protrusions 16 are internally hollow, V-shaped hollow protrusions 16, and the hollow protrusions 16 have multiple air holes on their sides. The hollow protrusions 16 also have multiple spring-loaded components inside. In this application, the spring-loaded components are internal reinforcing ribs, which are connected from one side of the top surface 11 of the bottle cap to the tip of the bottom of the hollow protrusion 16. Preferably, the connection point between the two hollow protrusions 16 is a V-shaped groove. In use, the top of the bottle mouth abuts against the V-shaped groove. The air holes on the sides of the hollow protrusions 16 can form an air buffer under pressure, thereby reducing the direct impact force between the bottle mouth and the bottle cap, improving sealing performance and impact resistance. It also helps to accommodate tolerances generated at the bottle mouth during cap production, resulting in a better sealing effect compared to a solid structure. It should be noted that the hollow protrusions 16 are flexible hollow protrusions 16, such as rubber hollow protrusions 16. The reinforcing ribs are used to reset the hollow protrusion 16 after it is compressed, and also to facilitate sealing.

[0030] Preferably, the bottle cap sidewall 12 adopts a variable thickness design, wherein the thickness of the stress-bearing area with the internal thread 13 is greater than the thickness of the non-stress-bearing area without the internal thread 13. The thickness of the stress-bearing area is 1.2 to 1.5 times the thickness of the non-stress-bearing area (i.e., the middle area of ​​the bottle cap sidewall 12 is the stress-bearing area, and the top and bottom are the non-stress-bearing areas). This variable thickness design can effectively enhance the load-bearing capacity of the stress-bearing area during tightening or unscrewing of the bottle cap, prevent the internal thread 13 from deforming or breaking due to excessive force, and at the same time ensure that the non-stress-bearing area maintains a lighter structural weight, reducing overall material consumption and achieving a lightweight design. By setting the thickness of the stress-bearing area to 1.2 to 1.5 times the thickness of the non-stress-bearing area, the bottle cap can withstand greater tightening force during use without being easily damaged, while maintaining good feel and operational stability.

[0031] Preferably, the top surface 11 of the bottle cap includes a relatively thinned first top plate area 111 and a relatively thickened second top plate area 112. The first top plate area 111 is the annular portion of the top surface 11 of the bottle cap, and the second top plate area 112 is an arc-shaped transition area located near the side wall 12 of the bottle cap. An X-shaped reinforcing structure for enhancing load-bearing capacity is formed on the inner side of the first top plate area 111. The thickness of the first top plate area 111 is 0.4 to 0.8 times the thickness of the stress-bearing area. By forming a relatively thinned first top plate area 111 and a relatively thickened second top plate area 112 on the top surface 11 of the bottle cap, a combination of lightweighting and enhanced strength is achieved. The first top plate area 111, as the annular portion, effectively enhances its load-bearing capacity through the X-shaped reinforcing structure, preventing deformation or breakage of the top plate even under external impact or when the bottle cap is twisted, while simultaneously reducing the overall weight. The arc-shaped transition area of ​​the second top plate region 112 near the side wall 12 of the bottle cap is thickened, enabling the bottle cap to better withstand lateral pressure when tightened or subjected to force, ensuring the overall structural stability and sealing of the bottle cap. In addition, the thickness of the first top plate region 111 is controlled within the range of 0.4 to 0.8 times the thickness of the stress-bearing area, maintaining the elasticity and toughness of the top plate while, in conjunction with the X-shaped reinforcing structure, making the stress on the top plate more even, thereby improving the durability and safety of the bottle cap. The overall design takes into account lightweight, strength, and operational comfort.

[0032] Preferably, the outer peripheral wall of the inner sealing ring 14 is provided with a rubber layer. During the tightening process of the bottle cap, the rubber layer can achieve flexible compression and fit with the inner wall of the bottle opening, overcoming the problem of poor sealing caused by the dimensional tolerance or deviation of the bottle opening; at the same time, the rubber material has good elasticity and resilience, and can automatically restore its shape after being subjected to force, ensuring that the bottle cap can still maintain a reliable seal after repeated opening and closing, and extending the service life of the bottle cap.

[0033] This invention provides a lightweight bottle cap. By incorporating an inner sealing ring 14, an outer sealing ring 15, and hollow protrusions 16 on the inner side of the cap's top surface 11, a multi-layered sealing and buffering structure is achieved. The inner sealing ring 14 tightly abuts against the inner wall of the bottle opening, while the outer sealing ring 15 fits against the outer wall of the top side of the bottle opening, creating a double seal when the bottle opening is tightened, effectively preventing liquid leakage. The two hollow protrusions 16 clamp the top surface of the bottle opening. Because the hollow structure of the protrusions 16 allows for elastic deformation under stress, it buffers pressure fluctuations generated during assembly or use, reducing stress concentration at the bottle opening and cap, and improving sealing stability. Meanwhile, the maximum diameter of the protrusion 142 on the side of the inner sealing ring 14 closest to the bottle cap opening is slightly larger than that on the side furthest from the bottle cap opening. This allows for initial sealing at the initial tightening stage, and further secondary sealing as tightening progresses, forming a graded sealing structure that improves sealing reliability. Simultaneously, the cooperation between the two protrusions 142 disperses the pressure during tightening, resulting in lower torque required for the bottle cap to achieve a good seal. Furthermore, the anti-theft ring 20, combined with the protrusion 21 and connecting rib 22, provides anti-detachment protection during opening or transportation of the bottle cap body 10, ensuring a secure connection between the bottle cap and the bottle body. Therefore, this application significantly improves the sealing performance, assembly reliability, and safety of the bottle cap, making it particularly suitable for lightweight bottle cap design requirements.

[0034] The above-disclosed embodiments are merely some preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model patent application shall still fall within the scope of the present utility model.

Claims

1. A lightweight bottle cap, characterized in that: Includes a bottle cap and a security ring. The bottle cap body includes a top surface and a side wall connected to the top surface. The end of the side wall away from the top surface forms the cap opening. The inner wall of the side wall has internal threads. An inner sealing ring, an outer sealing ring, and two hollow protrusions protrude from the inner side wall of the top surface towards the cap opening. The inner sealing ring includes an inner sealing ring body and two protrusions located on the side of the inner sealing ring body near the cap side wall. The protrusions near the cap opening are connected to the inner sealing ring body in an arc-shaped manner, and the protrusions near the cap opening are connected to the inner sealing ring body in an arc-shaped manner. The maximum protrusion diameter of the side protrusion is slightly larger than the maximum protrusion diameter of the side protrusion away from the bottle cap opening; the outer sealing ring is disposed between the inner sealing ring and the bottle cap sidewall, and the outer sealing ring is configured as an arc bending towards the bottle cap sidewall within a predetermined distance from the side near the bottle cap opening to the side away from the bottle cap opening; a recessed groove is provided between the outer sealing ring and the bottle cap sidewall, recessed towards the top surface of the bottle cap; two hollow protrusions are disposed between the inner sealing ring and the outer sealing ring, the two hollow protrusions are connected, and a spring-loaded component is provided inside the hollow protrusion; The anti-theft ring is connected to the side wall of the bottle cap away from the top surface of the bottle cap. Multiple protrusions are spaced apart on the inner peripheral wall of the anti-theft ring, and connecting ribs are provided between the protrusions.

2. The lightweight bottle cap as described in claim 1, characterized in that, The bottle cap body and the anti-theft ring are connected by a connecting bridge with a break point.

3. The lightweight bottle cap as described in claim 2, characterized in that, The internal thread is configured as a uniformly distributed three-thread thread.

4. The lightweight bottle cap as described in claim 1, characterized in that, The protrusion is an arc-shaped protrusion or a triangular protrusion with an arc-shaped tip.

5. The lightweight bottle cap as described in claim 1, characterized in that, The connection between the two hollow protrusions is configured as a V-shaped groove.

6. The lightweight bottle cap as described in claim 1, characterized in that, The connection between the two protrusions is set as an arc-shaped groove, and an annular rubber ring is provided at the arc-shaped groove.

7. The lightweight bottle cap as described in claim 1, characterized in that, The outer wall of the bottle cap sidewall is provided with several vertical reinforcing ribs.

8. The lightweight bottle cap as described in claim 1, characterized in that, The two hollow protrusions are V-shaped hollow protrusions with internal hollow interiors.

9. The lightweight bottle cap as described in claim 1, characterized in that, The bottle cap sidewall adopts a variable thickness design, wherein the thickness of the stress-bearing area with internal threads is greater than the thickness of the non-stress-bearing area without internal threads.

10. The lightweight bottle cap as described in claim 1, characterized in that, The top surface of the bottle cap includes a relatively thinned first top plate area and a relatively thickened second top plate area. The first top plate area is a circular portion of the top surface of the bottle cap, and the second top plate area is an arc-shaped transition area located near the side wall of the bottle cap. An X-shaped reinforcing structure for enhancing load-bearing capacity is formed on the inner side of the first top plate area.

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