Flip-top retaining structure for bottle cap, and bottle

Abstract

A flip-top retaining structure for a bottle cap, and a bottle. The flip-top retaining structure comprises an integrally formed cap body; the cap body is provided with a long tear line and a short tear line in the circumferential direction; two ends of the long tear line are provided with inner side notches in the axial direction of the cap body, and two ends of the short tear line are provided with outer side notches in the axial direction of the cap body; and once the long tear line and the short tear line are torn, parts on the upper sides of the long tear line and the short tear line constitute a flip-top, parts on the lower sides of the long tear line and the short tear line constitute a bottle cap base, and parts between the inner side notches and the outer side notches constitute a connecting strip. By setting the lengths and positions of the inner side notches and the outer side notches, when the flip-top is flipped 180 degrees, there is a contact part between the bottle cap base and the flip-top, and the pulling force of the connecting strip causes elastic deformation of the contact part, or the connecting strip is stretched to generate elastic deformation; and when the flip-top is flipped more than 180 degrees, the contact part or the connecting strip rebounds, so that the flip-top remains in a stress-retained state, ensuring that the flip-top is in an open state, preventing the flip-top from touching the mouth or nose of a user during drinking to avoid interference with drinking, and having the characteristics of being convenient to use and convenient to open. The bottle comprises the flip-top retaining structure and a bottle body.

Description

A flip-top retaining structure for a bottle cap and a bottle Technical Field

[0001] This application relates to packaging containers, and more particularly to a flip-top retaining structure for a bottle cap and a bottle. Background Technology

[0002] The same applicant earlier filed a flip-top beverage bottle cap application, application number 202321018918X, filed on April 27, 2023. It has an outwardly protruding wrench part integrally formed on the lower outer wall of the plate, and an outwardly protruding anti-reverse piece is provided on the top of the bottle cap. In the subsequent actual production and use, the inventor found that the bottle cap has shortcomings. First, the wrench part and the anti-reverse piece protrude outward, which requires high mold and production. Second, during packaging and transportation, the wrench part is easily bumped, causing the plate to crack locally.

[0003] Subsequently, on May 25, 2023, the applicant filed a patent application with application number 2023212962416 entitled "A Pry-Open Beverage Bottle Cap". The cap's flap extends downwards, and there is no outward-extending lever or flap on the cap. This solves the problem that the flap is easily touched during packaging and transportation, causing local cracking of the cap. However, it still has the problem of high production difficulty. This application is a further improvement on this problem.

[0004] In addition, in patent application No. 2023212962416, a circumferential folding groove is provided on the plate, and the part below the folding groove is the handle. When opening, the handle folds outward along the folding groove, and then the handle is lifted upward to break the tear line and open the bottle cap. In subsequent actual testing, the applicant found that because the handle is small, only two fingers can pinch it, and it takes a lot of force to break the tear line, making it inconvenient to open the bottle cap.

[0005] Furthermore, nowadays, when using a flip-top, due to the design and structure of the flip-top itself, it is easy for the flip-top to flip back to its original position relative to the bottle or cap holder and come into contact with the user's mouth or nose. In addition, it is also easy for the flip-top to close the liquid outlet of the bottle or cap holder again. If the user needs to drink at this time, they need to operate the flip-top to open it again, which is inconvenient.

[0006] In addition, some flip-top bottle caps typically consist of two parts: a cap holder and a flip cap. The flip cap and cap holder are connected by a flexible connecting strip. This connecting strip generally has two structures: one with a crease in the middle, where the strip folds along the crease when the flip cap is closed. Bottle caps with this type of connecting strip, due to inherent structural limitations, generally have a limited opening angle of around 135°-150°. Therefore, when using such products, the cap often accidentally touches the user's face. There are two main types of contact surfaces, one being direct contact with the user, especially when drinking water, with the bottle fully or nearly fully upright. The other type has a crease-free structure where the connecting strap is U-shaped when the flip-top is closed. When the flip-top is opened, the strap is straightened (or nearly straightened). However, before the product is sold, the flip-top is closed for extended periods, causing permanent deformation of the connecting strap. This results in a rebound force, causing the flip-top to bounce back, directly affecting the user's experience, such as the flip-top bouncing back and hitting the user's face.

[0007] Therefore, this application addresses the aforementioned issues. Application content

[0008] The purpose of this application is to overcome the shortcomings of the prior art and provide a flip-top retaining structure for a bottle cap that ensures the flip-top remains in the open position, preventing the flip-top from touching the user's mouth or nose during drinking and thus affecting the drinking experience. It is characterized by its ease of use, simple structure, convenient opening, and convenient resealing.

[0009] To address the aforementioned technical problems, this application provides a bottle cap flip-and-hold structure, including a bottle cap seat and a flip cap. A connecting band is provided between the bottle cap seat and the flip cap. When the flip cap is flipped 180 degrees, there is a contact area between the bottle cap seat and the flip cap. The tension of the connecting band causes the contact area to undergo elastic deformation, or the connecting band is stretched to undergo elastic deformation. When the flip cap is flipped more than 180 degrees, the contact area or the connecting band rebounds, keeping the flip cap in a force-holding state. The structure also includes an integrally formed cap body, which has a long tear line and a short tear line along the circumferential direction. The two ends of the long tear line are provided with an inner cut along the axial direction of the cap body, and the two ends of the short tear line are provided with an outer cut along the axial direction of the cap body. After the long tear line and the short tear line break, the upper part of the long tear line and the lower part constitute the flip cap, and the part between the inner cut and the outer cut constitutes the connecting band.

[0010] The long tear line has an arc-shaped structure extending from bottom to top at one end near the connecting strip and is connected to the inner cut. The inner cut is adapted to the arc shape of the long tear line and is a continuation of the long tear line.

[0011] The connecting strip has a sloping structure that slopes towards the center from bottom to top.

[0012] The connecting strip has a reinforcing bar located between the inner and outer incisions.

[0013] The thickness of the rib gradually decreases from the inner cut to the outer cut.

[0014] The long tear line has a downward-bent section in the middle, so that the lower edge of the flap forms a downward-protruding plate.

[0015] A groove is provided between the upper end of the plate and the flip cover.

[0016] A sealing plug is provided on the inner top side of the flip cover.

[0017] The sealing plug has a relief slope at the location corresponding to the plate.

[0018] The sealing plug has a downwardly protruding guide portion at the part away from the plate.

[0019] A sealing ring is provided on the outer surface of the sealing plug.

[0020] The short tear line is located on the top surface of the cover.

[0021] The upper end of the connecting strip extends to the top surface of the flap.

[0022] This application also provides a bottle with a flip-top retaining structure using a cap as described above, including a bottle body, the bottle mouth of the bottle body is provided with an external thread, and a support block is provided on the inner side of the plate. When the cap is assembled to the bottle mouth, the lower surface of the support block abuts against the upper surface of the external thread.

[0023] This application also provides a bottle with a flip-top retaining structure using a cap as described above, comprising a bottle body, wherein the bottle mouth of the bottle body is provided with an external thread, and the lower part of the external thread is provided with an upper convex ring and a lower convex ring, and a limiting groove is formed between the upper convex ring and the lower convex ring; the lower inner wall of the cap body is provided with a limiting block that is placed inside the limiting groove after the cap body is assembled to the bottle mouth; when the cap body is rotated in the forward direction and the limiting block is blocked by the lower convex ring, the inner top side of the flip-top seals the bottle mouth; when the cap body is rotated in the reverse direction and the limiting block is blocked by the upper convex ring, the inner top side of the flip-top separates from the upper end wall of the bottle mouth to form a pressure relief gap.

[0024] A sealing plug is provided on the inner side of the top of the flip cap; when the cap is rotated in the forward direction and the limiting block is blocked by the lower convex ring, the sealing plug is fully inserted into the bottle mouth to form a seal; when the cap is rotated in the reverse direction and the limiting block is blocked by the upper convex ring, the sealing plug is partially disengaged from the bottle mouth, so that a pressure relief gap is formed between the sealing plug and the bottle mouth.

[0025] This application also provides a bottle cap flip-cap retaining structure, including a bottle cap seat and a flip cap. The bottle cap seat and the flip cap are connected by a connecting strap. The connecting strap has a crease group consisting of at least two creases, so that the connecting strap forms a structure of at least three segments. Bottle cap straps are provided on both sides of the connecting strap. The two ends of the bottle cap straps are respectively connected to the bottle cap seat and the flip cap. When the flip cap is opened, the connecting strap is folded along the crease group, and the flip cap is fixed by pulling the bottle cap strap. At least one scratch is provided on the connecting strap along the length direction of the crease group.

[0026] The crease group consists of a first crease near the flip cover and a second crease near the bottle cap seat. The first crease and the second crease divide the connecting strip into an upper connecting strip body connected to the flip cover, a lower connecting strip body connected to the bottle cap seat, and a middle connecting strip body located between the first crease and the second crease.

[0027] The thickness of the connecting strap gradually decreases from the flap toward the first crease.

[0028] The thickness of the connecting strip gradually decreases from the bottle cap seat towards the second crease.

[0029] The thickness of the connecting strip gradually increases from the first and second creases on both sides toward the middle.

[0030] The bottle cap strap and the connecting strap are an integral structure.

[0031] The bottle cap strap and the connecting strap are separate structures, and a gap groove is provided between the bottle cap strap and the connecting strap.

[0032] Compared with the prior art, this application has the following advantages:

[0033] 1. This application, by setting the length and position of the inner and outer cuts, ensures that when the cap is flipped 180 degrees, there is a contact point between the cap holder and the cap. The tension of the connecting strap causes elastic deformation at the contact point, or the connecting strap is stretched and causes elastic deformation. When the cap is flipped more than 180 degrees, the contact point or connecting strap rebounds, keeping the cap in a force-holding state. This ensures that the cap remains open, preventing the cap from touching the user's mouth or nose during drinking and affecting the drinking experience. It is convenient to use and easy to open. In addition, it simplifies the structure of the cap and further reduces the difficulty of molding and production.

[0034] 2. The upper end of the plate in this application is provided with a folding groove between it and the flip cover. A support block is provided on the inner side of the plate. When the cap is assembled to the bottle mouth, the lower surface of the support block abuts against the upper surface of the external thread of the bottle mouth. When opened, the plate bends along the folding groove, and the support block rotates on the upper surface of the external thread. Based on the lever principle, an upward force is applied to the flip cover, causing the long tear line to break partially. Then, only a small force is needed to break the entire long tear line, making it easy to open.

[0035] 3. The folding crease of this application does not break after the flip cap is opened. During the process of returning the flip cap to the bottle opening, it will not be affected by the misalignment of the edges of the flip cap and the bottle cap seat. While achieving the flip cap open and maintaining the state, it also solves the problem of interference when returning the cap. Attached Figure Description

[0036] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings, wherein:

[0037] Figure 1 is one of the structural schematic diagrams of Embodiment 1 in this application.

[0038] Figure 2 is a second schematic diagram of the structure of Embodiment 1 in this application.

[0039] Figure 3 is a schematic diagram of the structure when the flip cover shown in Figure 1 is opened 180 degrees.

[0040] Figure 4 is a schematic diagram of the structure after the flip cover shown in Figure 1 is opened to more than 180 degrees.

[0041] Figure 5 is a cross-sectional view of the bottle cap shown in Figure 1 after it has been assembled onto the bottle neck.

[0042] Figure 6 is a schematic diagram of the structure of Embodiment 2 in this application.

[0043] Figure 7 is a cross-sectional view of the bottle cap shown in Figure 6.

[0044] Figure 8 is a schematic diagram of the structure of Embodiment 3 in this application.

[0045] Figure 9 is a cross-sectional view of the sealed state after the bottle cap shown in Figure 8 is assembled to the bottle mouth.

[0046] Figure 10 is a cross-sectional view of the depressurized state after the bottle cap shown in Figure 8 is assembled to the bottle mouth.

[0047] Figure 11 is a schematic diagram of the bottle's structure.

[0048] Figure 12 is a structural schematic diagram of Embodiment 4 in this application.

[0049] Figure 13 is a schematic diagram of the structure of Figure 12 when the flip cover is opened to more than 180 degrees.

[0050] Figure 14 is a structural schematic diagram of Embodiment 5 in this application.

[0051] Figure 15 is a schematic diagram of the structure of Figure 14 when the flip cover is opened to more than 180 degrees.

[0052] Figure 16 is a cross-sectional view of Embodiment 6 of this application.

[0053] Figure 17 is a schematic diagram of the usage state of Embodiment 7 in this application.

[0054] Figure 18 is a three-dimensional structural diagram of Embodiment 8 in this application.

[0055] Figure 19 is a schematic diagram of the usage state of Embodiment 8 in this application.

[0056] Figure 20 is a cross-sectional view of Embodiment 8 of this application.

[0057] Figure 21 is an enlarged schematic diagram of A in Figure 20.

[0058] Figure 22 is a schematic diagram of the usage state of Embodiment 9 in this application.

[0059] Figure 23 is a schematic diagram of the usage state of Embodiment 10 in this application.

[0060] Figure 24 is a schematic diagram of the usage state of Embodiment 11 in this application.

[0061] Figure 25 is a schematic diagram of the usage state of Embodiment 12 in this application.

[0062] Figure 26 is one of the perspective views of the bottle caps of Embodiments 1-3 in this application.

[0063] Figure 27 is a second perspective view of the bottle caps of Embodiments 1-3 in this application. Detailed Implementation

[0064] The embodiments of this application will now be described in detail with reference to Figures 1-27.

[0065] As shown in Figures 1-11, 26, and 27, this application provides a flip-top retaining structure for a bottle cap, including an integrally molded cap body 1, which is integrally injection molded from a plastic material with a certain elasticity. The cap body 1 has a long tear line 11 and a short tear line 12 along the circumferential direction. The long tear line 11 has inner cutouts 111 at both ends along the axial direction of the cap body 1, and the short tear line 12 has outer cutouts 121 at both ends along the axial direction of the cap body 1. In this application, "along the circumferential direction" refers to along the circumferential surface; it can be an arc line located in the same plane, or an irregular line with upper and lower bends that are not in the same plane. The axial direction is relative to the circumferential direction; it can be a direction parallel to the axis of the bottle cap, or an inclined direction with a certain angle. The long and short tear lines can be indentations, or dotted lines, etc.

[0066] As shown in Figures 1-10, after the long tear line 11 and the short tear line 12 break, the upper part of the long tear line 11 and the short tear line 12 constitutes the flip cover 3, and the lower part constitutes the bottle cap seat 2. The part between the inner cut 111 and the outer cut 121 constitutes the connecting band 4. When the flip cover 3 is flipped 180 degrees, there is a contact part between the bottle cap seat 2 and the flip cover 3. The tension of the connecting band 4 causes the contact part to undergo elastic deformation, or the connecting band 4 is stretched to undergo elastic deformation. When the flip cover 3 is flipped more than 180 degrees, the contact part or the connecting band 4 rebounds, so that the flip cover 3 is in a force-holding state, avoiding the situation where the flip cover touches the user's mouth or nose during drinking and affecting drinking. It has the characteristics of being easy to use and easy to open. In addition, by setting the length and position of the inner and outer cuts, this application makes the flip cover in a force-holding state after it is flipped more than 180 degrees, which simplifies the structure of the bottle cap and further reduces the difficulty of mold making and production.

[0067] Furthermore, the length of the inner slit 111 is greater than the length of the outer slit 121. That is, the connecting band 4 is shorter on the side near the outer slit 121 and longer on the other side near the inner slit 111. When the flip cover 3 is opened and the connecting band 4 is forcibly stretched, the shorter side of the connecting band 4 is stretched less than the other side. This shorter side of the connecting band 4 restricts the opening of the flip cover 3 and the bottle cap seat 2, preventing excessive separation between them and causing instability in the position of the flip cover 3 at the edge between the connecting bands 4. For example, if the flip cover 3 is opened once and this position is inside the bottle opening, it will be flipped to the outside of the bottle cap seat 2 the next time it is opened, serving a positioning function. The longer side of the connecting band 4 increases its length, thereby increasing the maximum length that can be forcibly stretched and preventing breakage.

[0068] The bottle cap is circular. The lengths and positions of the inner cut 111 and the outer cut 121 are appropriately designed. Generally, the distance between the inner cut 111 and the outer cut 121 should be greater than 1 mm. The lengths of the inner cut 111 and the outer cut 121 can be the same or slightly different. Their shapes can be straight segments along the axis, oblique lines with a certain angle to the axis, or curves of any shape. When the flip cap 3 is flipped 180 degrees, the part other than the inner cut 111 is arc-shaped. The length of the cut is less than the sum of the arc heights of the flip cap 3 and the bottle cap seat 2 by 0.1 to 5 mm, thus creating a contact point between the bottle cap seat 2 and the flip cap 3.

[0069] For example: In the first solution, the materials of the bottle cap holder 2 and the flip cover 3 are relatively thin and soft, and elastic deformation occurs at the contact point of the bottle cap holder 2 and / or the flip cover 3. That is, the tension of the connecting band 4 causes elastic deformation at the contact point (the slight stretch of the connecting band 4 can be ignored); when the flip cover 3 is flipped 180 degrees, the contact point and the connecting band 4 are basically on the same plane; after the flip cover 3 is flipped more than 180 degrees, the contact point moves to the top of the connecting band 4. After releasing, the contact point rebounds, which can keep the flip cover 3 in a state of force retention.

[0070] The second option is to make the bottle cap holder 2 and the flip cover 3 thicker and harder, so that they are not easily deformed. This allows the connecting strap 4 to be thinner and more elastic. When the flip cover 3 is flipped 180 degrees, the connecting strap 4 is stretched and undergoes elastic deformation (the slight deformation of the bottle cap holder 2 and the flip cover 3 can be ignored). After the flip cover 3 is flipped more than 180 degrees, the connecting strap 4 rebounds, so that the flip cover 3 is in a state of being held in place by force.

[0071] As shown in Figures 26 and 27, the end of the long tear line 11 near the connecting strip 4 is an arc-shaped structure extending from bottom to top and connected to the inner cut 111. The inner cut 111 is adapted to the arc shape of the long tear line 11 and is a continuation of the long tear line 11. That is, the long tear line 11 and the inner cut 111 form a larger arc-shaped structure. There is always a tear line distance between the flip cap and the bottle cap seat, which can effectively prevent the flip cap from getting stuck in the gap between the bottle cap seat and the bottle mouth when the flip cap is closed.

[0072] Because the connecting strap 4 is constantly stretched outwards during the flip-opening process, after a certain number of uses, it will exhibit inelastic deformation that is difficult to fully recover, forming an outward convex structure on the connecting strap 4, thus creating a prickly, foreign object sensation. The connecting strap 4 has a sloping structure that slopes towards the center from bottom to top. It can be a sloping structure with the same slope throughout, or the slope can gradually decrease from the inner cut 111 to the outer cut 121. That is, the slope is greatest on the side closer to the inner cut 111 and decreases as it gets closer to the outer cut 121. The slope on the side located at the outer cut 121 is consistent with the shape of the cover 1 itself. This application changes the connecting strap from a vertically upward structure to an inwardly sloping structure. On the one hand, this increases the length of the connecting strap, increasing the limit of its elastic deformation. When the flip cover is opened and closed, the length of the connecting strap 4 remains unchanged, thereby reducing the non-elastic deformation of the connecting strap 4 and reducing the feeling of a sharp, foreign object. On the other hand, the surface of the connecting strap 4, when viewed from the overall cover 1, resembles a chamfered structure. However, even after the connecting strap 4 undergoes non-elastic deformation and protrudes, it will not protrude too much from the outer diameter of the cover 1, or even at all. For example, changing from a sloping structure with a large angle of inclination to a sloping structure with a small angle of inclination can also reduce the feeling of a sharp, foreign object.

[0073] As shown in Figure 27, a rib 44 is provided inside the connecting band 4 between the inner cut 111 and the outer cut 121. The thickness of the rib 44 gradually decreases from the inner cut 111 to the outer cut 121. When the flip cover is opened, the connecting band 4 can be stretched sufficiently without tearing.

[0074] In other embodiments, a bottle cap holder 2 and a flip cover 3 are included. A connecting strap 4 is provided between the bottle cap holder 2 and the flip cover 3. When the flip cover 3 is flipped 180 degrees, there is a contact part between the bottle cap holder 2 and the flip cover 3. The tension of the connecting strap 4 causes the contact part to undergo elastic deformation, or the connecting strap 4 is stretched to undergo elastic deformation. When the flip cover 3 is flipped more than 180 degrees, the contact part or the connecting strap 4 rebounds, so that the flip cover 3 is in a force-holding state. In this structure, although the bottle cap holder 2, the flip cap 3, and the connecting strip 4 are injection molded simultaneously, the bottle cap holder 2 and the flip cap 3 are relatively independent, and there are no other connecting parts between them except for the connecting strip 4. In this structure, the diameter of the flip cap 3 can be larger than the diameter of the bottle cap holder 2. After closing, the flip cap 3 is directly fitted onto the bottle cap holder 2. Alternatively, an inwardly recessed step can be provided at the upper end of the bottle cap holder 2, and the flip cap 3 can be fitted onto the step after closing. A snap-fit ​​structure can also be provided between the flip cap 3 and the bottle cap holder 2 or between the flip cap 3 and the step to keep them snapped together.

[0075] The long tear line 11 has a downward-bent portion 21 in the middle, so that the lower edge of the flap 3 forms a downwardly protruding plate 31. The bending portion 21 is preferably a through cut to facilitate opening the plate 31. The portion of the long tear line 11 below and on both sides of the plate 31 is preferably a through cut. The portion below the plate 31 should have a certain width and a bevel to facilitate opening.

[0076] A folding groove 32 is provided between the upper end of the plate 31 and the flip cover 3. By prying outward from the lower end of the plate 31, the plate 31 bends along the folding groove 32, making it easy to open. The cross-section of the folding groove 32 is V-shaped, and the angles of the two sides of the folding groove 32 can limit the bending angle of the plate 31 along the folding groove 32; for example, the inclination angle of the two sides can be 10-65 degrees, so that the plate 31 can be bent along the folding groove 32 by 20-130 degrees.

[0077] A sealing plug 33 is provided on the inner top side of the flip cap 3. After being assembled to the bottle mouth, the sealing plug 33 is inserted into the bottle mouth to enhance the sealing effect. In order to facilitate the insertion and removal of the sealing plug from the bottle mouth, the height of the sealing plug cannot be very large, as shown in Figure 8.

[0078] The sealing plug 33 is provided with an avoidance slope 331 at the part corresponding to the plate 31, which facilitates the sealing plug 33 to be inserted into or removed from the bottle opening.

[0079] The sealing plug 33 has a downwardly protruding guide portion 332 at the portion away from the plate 31. When the cap is flipped approximately 90 degrees, the end of the guide portion 332 is already above the bottle opening. Upon further flipping, the guide portion 332 first slides into the bottle opening, ensuring that it is not easily misaligned when the cap is closed. Furthermore, the avoidance slope 331 and the guide portion 332 can be provided individually or both for better results.

[0080] To further improve the sealing performance, a sealing ring 333 is provided on the outer surface of the sealing plug 33.

[0081] As shown in Figures 6 and 7, the diameter of the flip cap 3 is smaller than the diameter of the bottle cap seat 2, and the overall shape is "convex". A thin-walled section is formed between the lower end of the flip cap 3 and the upper end of the bottle cap seat 2. The long tear line 11 is formed by the thin-walled section between the bottle cap seat 2 and the flip cap 3. The short tear line 12 can also be formed by the thin-walled section between the bottle cap seat 2 and the flip cap 3. This type of bottle cap is easier to demold and does not require secondary processing of the long tear line 11 and the short tear line 12.

[0082] As shown in Figure 16, the short tear line 12 is located on the top surface of the cap 1, and the upper end of the connecting strap 4 extends to the top surface of the flip cap 3. When flipping the flip cap 3, a certain amount of force needs to be applied, and the flip cap 3 is forcibly flipped backward by hand. The connecting strap 4 will be forcibly stretched to a certain extent. The upper end of the connecting strap 4 extends to the top surface of the flip cap 3, which can increase the length of the connecting strap 4, thereby increasing the limit of the connecting strap 4 that can be forcibly stretched, and preventing the connecting strap 4 from being torn. When the flip cap 3 is flipped to 180° or even 220°, there is a contact point between the cap seat 2 and the flip cap 3. After releasing the force, the connecting strap 4 retracts, so that the There is a tendency for the bottle cap holder 2 and the flip cap 3 to move closer to each other, thereby increasing the friction at the contact points between the bottle cap holder 2 and the flip cap 3. This causes the bottle cap holder 2 and the flip cap 3 to press against each other and be fixed in place. Without external force, they will not return to a state less than 180 degrees, thus preventing the flip cap 3 from springing back and hitting the nose and face when the consumer is drinking. Only when the flip cap 3 is pressed together by external force and the connecting strap 4 is forcibly stretched again will the flip cap 3 return to a state less than 180 degrees and close.

[0083] As shown in Figures 12 and 13, this application discloses a flip-top retaining structure for a bottle cap, comprising a circular cap body 1 integrally injection molded, vacuum-formed, or blow-formed from plastic material. The cap body 1 has an open connecting tear line 13, which can be a dotted line, a continuous or discontinuous indentation, etc. The cap body 1 also has a folding indentation 14 along the circumferential direction, which can be one or two or more parallel indentations. The two ends of the folding indentation 14 are connected to the two ends of the connecting tear line 13. After the breakage, the upper part of the connecting tear line 13 forms the flip cover 3, the lower part forms the bottle cap seat 2, and the folding indentation 14 forms the connecting band 4 connecting the flip cover 3 and the bottle cap seat 2. When the flip cover 3 is flipped more than 180 degrees along the folding indentation 14, the parts on both sides of the connecting band 4 are stretched to generate an inward pulling force. This pulling force causes the contact part between the flip cover 3 and the bottle cap seat 2 to be squeezed and generate an elastic deformation of more than 0.5 mm. At the same time, the middle part of the connecting band 4 arches upward to generate an outward tension, keeping the flip cover 3 in the flipped state. The larger the arc length of the folding indentation 14, the greater the deformation caused by the compression of the contact area between the flip cap 3 and the bottle cap seat 2, and the greater the rebound force will be. The folding indentation does not break after the flip cap is opened, and it will not be interfered with by the misalignment of the edges of the flip cap and the bottle cap seat during the process of putting the flip cap back on the bottle mouth. By reasonably setting the arc length of the folding indentation 14 according to the size of the bottle cap, it is convenient to open the bottle cap to keep the flip cap open, and it is also convenient to put the cap back on.

[0084] As shown in Figures 14 and 15, this application discloses a flip-top retaining structure for a bottle cap, comprising a circular cap body 1 integrally injection molded, vacuum-formed, or blow-molded from plastic material. The cap body 1 has an open connecting tear line 13, which can be a dotted line, a continuous or discontinuous indentation, etc. The cap body 1 also has a circumferential folding indentation 14, which can be one or two or more parallel indentations. Two axial fracture portions 15 are provided between each end of the folding indentation 14 and the end of the connecting tear line 13. These fracture portions 15 can be continuous or non-continuous. Cuts, etc.; After the connecting tear line 13 breaks, the upper part of the connecting tear line 13 forms the flip cover 3, the lower part forms the bottle cap seat 2, the part between the two broken parts 15 forms the bottle cap band 5 connecting the flip cover 3 and the bottle cap seat 2, and the folding indentation 14 forms the connecting band 4 connecting the flip cover 3 and the bottle cap seat 2; when the flip cover 3 is flipped more than 180 degrees, the bottle cap band 5 is stretched to generate an inward pulling force. This pulling force causes the contact part between the flip cover 3 and the bottle cap seat 2 to be squeezed to generate an elastic deformation of more than 0.5 mm. At the same time, the connecting band 4 arches upward to generate an outward tension, so that the flip cover 3 remains in the flipped state. The smaller the height of the fracture 15, the greater the tensile force generated; the larger the arc length of the folding indentation 14, the greater the deformation caused by the compression of the contact area between the flip cap 3 and the bottle cap seat 2, and the greater the rebound force. The folding indentation does not break after the flip cap is opened, and it will not be interfered with by the misalignment of the edges of the flip cap and the bottle cap seat during the process of putting the flip cap back on the bottle mouth. By reasonably setting the arc length of the folding indentation 14 and the height of the fracture 15 according to the size of the bottle cap, it is easy to open the bottle cap to keep the flip cap open, and it is also easy to put the cap back on.

[0085] As shown in Figures 12-15, a sealing plug 33 is provided on the inner top side of the flip cap 3. A downwardly protruding guide portion 332 is provided on the side of the sealing plug 33 near the folding indentation 14. During the cap-closing process, the guide portion 332 first extends into the bottle mouth, facilitating the complete insertion of the sealing plug 33 into the bottle mouth. A sealing ring 333 is provided on the outer surface of the sealing plug 33, providing a tighter seal with the inner wall of the bottle mouth.

[0086] The diameter of the flip cover 3 can be the same as the diameter of the bottle cap seat 2, and the whole is cylindrical; or the diameter of the flip cover 3 can be smaller than the diameter of the bottle cap seat 2, and the whole is stepped; the folding indentation 14 is the thin-walled part between the bottle cap seat 2 and the flip cover 3.

[0087] As shown in Figures 12-15, the connecting strap 4 consists of a lower connecting strap 41 and an upper connecting strap 42. The lower end of the lower connecting strap 41 is connected to the bottle cap seat 2, and the upper end of the upper connecting strap 42 is connected to the flip cap 3. The folding indentation 14 is located at the connection point between the lower connecting strap 41 and the upper connecting strap 42. As shown in Figure 15, when an external force flips the flip cap 3 open to approximately 180 degrees, under the tension of the two bottle cap straps 5, a forcefully intersecting force occurs between the lower connecting strap 41 and the upper connecting strap 42. Because the lower connecting strap 41 and the upper connecting strap 42 are connected together, they will not cross each other. Due to the forced backward folding of the flip cover 3, the folding angle between the lower connecting strap 41 and the upper connecting strap 42 will be greater than 180°. When the flip cover 3 is released, the pulling action of the cap strap 5 keeps the lower connecting strap 41 and the upper connecting strap 42 at an angle greater than 180°. When the flip cover 3 needs to be closed, the cap strap 5 is pulled back. When the lower connecting strap 41 and the upper connecting strap 42 are folded back to a state less than 180°, the thickness of the lower connecting strap 41 gradually decreases from the bottle cap seat 2 towards the flip cap 3, and the thickness of the upper connecting strap 42 gradually decreases from the flip cap 3 towards the bottle cap seat 2. When the flip cap 3 is opened to a state greater than 180°, the lower connecting strap 41 and the upper connecting strap 42 are more likely to deform, thereby making it easier for the lower connecting strap 41 and the upper connecting strap 42 to fold back to a state greater than 180°.

[0088] As shown in Figure 17, a bottle cap flip-cap retaining structure includes a bottle cap seat 2 and a flip cap 3. Symmetrical connecting bands 4 are provided between the bottle cap seat 2 and the flip cap 3. The bottle cap seat 2 has an upwardly protruding vertical piece 23 located between the connecting bands 4. The vertical piece 23 has a spring-loaded part 231. When the bottle cap seat 2 is screwed onto the bottle, the spring-loaded part 231 fits tightly against the bottle opening. When the flip cap 3 is flipped, it rotates along the outer side of the spring-loaded part, thus preventing the edge of the flip cap 3 from inserting between the spring-loaded part and the bottle opening, which would prevent the flip cap 3 from getting stuck and causing it to be unable to be closed or opened.

[0089] As shown in Figure 17, the flip cover 3 has a pry bar 24 corresponding to the spring piece 231, which extends the outer edge of the flip cover 3. When the flip cover 3 is flipped, the pry bar rotates along the outer side of the spring piece, further preventing the edge of the flip cover 3 from being inserted between the spring piece and the bottle mouth. Moreover, during the flipping process, the pry bar 24 pries the spring piece 231 against each other, thereby producing a sound. This is the maximum flipping angle designed for the flip cover 3. If it continues to be flipped, there is a possibility of damaging the bottle cap, which serves as a reminder.

[0090] When the flip cover 3 is closed, the lever portion 24 is located above the spring portion 231. The edge of the lever portion 24 is flush with the outer wall of the spring portion 231, or the edge of the lever portion 24 extends beyond the outer wall of the spring portion 231. This ensures that when the flip cover 3 is opened, the lever portion can rotate along the outer side of the spring portion, and when the flip cover 3 is closed, the lever portion will not interfere with the spring portion. If the bottle cap diameter is large, the overall strength of the bottle cap decreases (i.e., a large-diameter bottle cap is more prone to deformation than a small-diameter bottle cap). The spring portion warps outward and separates from the bottle mouth, and the edge of the lever portion abuts against the inner wall of the spring portion. When opened again, the edge of the lever portion directly inserts into the gap between the spring portion and the bottle mouth.

[0091] As shown in Figures 18-25, this application discloses a bottle cap flip-cap retaining structure, including a bottle cap seat 2 and a flip cap 3. The bottle cap seat 2 and the flip cap 3 are connected by a connecting strap 4. The connecting strap 4 has a crease group consisting of at least two creases, so that the connecting strap 4 forms a structure of at least three segments. Bottle cap straps 5 are provided on both sides of the connecting strap 4. The two ends of the bottle cap straps 5 are respectively connected to the bottle cap seat 2 and the flip cap 3. When the flip cap 3 is flipped open, the connecting strap 4 folds along the crease group, and the bottle cap straps 5 pull the flip cap 3 to fix the flip cap 3. When the cap is opened, the connecting strap folds along the crease group and pulls the cap in place by the cap strap 5. This effectively solves the problem of the cap hitting the user's face due to the elasticity of the connecting strap. At the same time, it greatly increases the opening angle of the cap to about 270° (as shown in Figures 23-25), which can easily solve the problem of the cap coming into direct contact with the user's face when drinking water.

[0092] As shown in Figure 21, the crease group consists of a first crease 401 near the flip cover 3 and a second crease 402 near the bottle cap seat 2. The first crease 401 and the second crease 402 divide the connecting strip 4 into an upper connecting strip 42 connected to the flip cover 3, a lower connecting strip 41 connected to the bottle cap seat 2, and a middle connecting strip 43 located between the first crease 401 and the second crease 402. The first crease 401 and the second crease 402 can be narrow grooves or relatively wide recesses. They can be straight lines or curved lines. Furthermore, the first crease 401 and the second crease 402 can be even wider recesses, allowing them to connect and form a single crease.

[0093] The connecting strip 4 has at least one scratch along the length of the crease group. The scratch can be located on the first crease 401 and the second crease 402. That is, the first crease 401 and the second crease 402 can be directly cut open, and the two ends are still connected. If it is completely cut open, the bottle cap seat 2 and the flip cap 3 will separate. Alternatively, when the flap 3 is opened, the scratches can be located outside the first crease 401 and the second crease 402. (Depending on the actual structure, the scratches may not crack if the requirements of the flap 3 are met. Therefore, whether the scratches crack or not when the flap 3 is opened is within the scope of protection.) This can increase the length that the connecting strap 4 can extend, thereby further increasing the opening angle of the flap 3. It can also better match creases of different widths and achieve a better flap effect. (For example, the narrower the crease, the smaller the length that can be stretched, and the smaller the opening angle of the flap. If the opening angle is too large, it is easy to exceed the limit of the stretchable crease, causing the crease to break directly. If it is combined with scratches, even if the width of the crease is narrow, it can crack during the opening of the flap, thereby increasing the limit of the stretchable crease of the connecting strap and achieving a better flap effect.) At the same time, it can also reduce the difficulty of opening the flap.

[0094] When an external force flips the cap 3 open to approximately 180 degrees, the connecting strap 4 changes from a folded state (i.e., the state when the cap 3 is closed) to a straightened state. Since the cap strap 5 restricts the range of motion of the cap 3, when the cap 3 is actually flipped to about 150 degrees, the cap strap 5 is in a straightened state, thus limiting the cap 3 from flipping further backward. At this point, greater force needs to be applied to forcibly stretch the cap strap 5, allowing the cap 3 to continue flipping backward. When the cap 3 is flipped to 180 degrees, the cap strap 5 is stretched to its longest state (even when stretched to this state, the cap strap 5 still has room for further stretching, and this is within the range of elastic deformation, preventing the cap strap 5 from becoming unable to retract after being stretched). Therefore, within the range of 150°-180°, and since the connecting strap 4 is not broken, the middle part of the connecting strap 4 will be in a state of relative compression (that is, the upper connecting strap 42 moves towards the lower connecting strap 41, the lower connecting strap 41 moves towards the upper connecting strap 42, and the middle connecting strap 43, the first crease 401 and the second crease 402 will change accordingly); the thickness of the upper connecting strap 42 gradually decreases from the flip cover 3 towards the first crease 401, and the thickness of the lower connecting strap 41 gradually decreases from the cap seat 2 towards the second crease 402, so that the upper connecting strap 42 and the lower connecting strap 41 can deform more easily, thus making it easier for the flip cover 3 to be folded to a state greater than 180°.

[0095] When the flip cover 3 is opened more than 180°, the cap band 5 retracts, thereby continuing to flip the flip cover 3 backward until the cap band 5 retracts to the initial state. At this time, the flip cover 3 is in its normal open state (as shown in Figures 23-25).

[0096] The thickness of the connecting strap 43 gradually increases from the first crease 401 and the second crease 402 on both sides towards the middle, increasing the strength between the connecting straps 43. This prevents irreversible deformation of the connecting strap 43 caused by the upper connecting strap 42 and the lower connecting strap 41 pressing against each other when the flap 3 is within the range of 150°-180°, thus affecting the opening and closing of the flap 3. If the connecting strap 43 is compressed, forming an arch in the middle, the distance between the first crease 401 and the second crease 402 will shorten, thereby shortening the connecting strap 4 as a whole, making it impossible for the flap 3 to close smoothly.

[0097] When the flip cover 3 is opened, the opening sides of the first crease 401 and the second crease 402 approach each other until they meet, which is the maximum opening angle of the flip cover 3. The opening sides of the first crease 401 and the second crease 402 can be perpendicular to the bottom of the crease, or they can form an obtuse angle or an acute angle with the bottom of the crease. When it is an obtuse angle, the distance between the opening sides of the crease and the point of contact is greater, and the angle of the flip cover 3 is larger; conversely, when it is an acute angle, the angle of the flip cover 3 is smaller. The specific angle can be adjusted according to the actual bottle structure and the scope of use. For example, for a condiment bottle, the flip cover 3 will not hit the user's face, so the opening angle of the flip cover 3 can be relatively smaller. For a beverage bottle, the opening angle of the flip cover 3 can be relatively larger. The opening angle can also be adjusted according to the diameter (width) of the bottle. For example, in common mineral water bottles, the ratio of the bottle body to the bottle opening is relatively small. When the flip cover 3 is opened to about 270°, the flip cover 3 will not abut against the bottle body. On the other hand, if the ratio of the bottle body to the bottle opening is relatively large, that is, when the width of the bottle body is large, if the flip cover 3 is opened at too large an angle, the flip cover 3 will abut against the upper part of the bottle body, making it unable to reach the maximum opening angle, and thus easily springing back.

[0098] Depending on the different bottle body structures, the dimensions of the connecting upper belt 42, connecting lower belt 41, and connecting middle belt 43 are adaptively changed, and the positional distance between the first crease 401 and the second crease 402 is specially designed according to the bottle body structure.

[0099] Furthermore, the connection point between the connecting strip 4 and the flip cover 3 is located at any one of the upper, middle, or lower ends of the flip cover 3.

[0100] The connecting strip 43 can have a uniform thickness, or it can be thicker at both ends than in the middle, giving the connecting strip 43 an arc-shaped structure. The first crease 401 and the second crease 402 are the relatively thinner positions of the connecting strip 4.

[0101] As shown in Figure 19, the bottle cap strap 5 and the connecting strap 4 are an integral structure, which makes the structure simpler.

[0102] As shown in Figure 22, the bottle cap strap 5 and the connecting strap 4 are separate structures, with a gap groove between them to prevent them from interfering with each other when the flip cover 3 is opened. If the flip cover 3 is opened, the bottle cap strap 5 will be forcibly stretched. If the bottle cap strap 5 and the connecting strap 4 are connected, the connecting strap 4 will also be stretched synchronously. Furthermore, since the bottle cap strap 5 and the connecting strap 4 act as a wider connecting strap, the range of elastic deformation is reduced, and it may even break directly.

[0103] As shown in Figures 23-25, the connection point between the connecting strip 4 and the bottle cap seat 2 is located at any one of the upper, middle, or lower ends of the bottle cap seat 2.

[0104] The bottle cap strip 5 has a curved structure, which can be a single bend or a combination of multiple bends in opposite directions, such as a wave structure. The curved structure can be a bend in the left-right direction or a bend in the front-back direction. By bending, the length of the bottle cap strip 5 can be increased, thereby further increasing the extension length.

[0105] The connecting strip 4 has a curved structure, which is the same principle as the curved structure of the bottle cap strip 5. The curved structure of the connecting strip 4 and the bottle cap strip 5 are similar in shape, which ensures the consistency of the overall appearance and avoids the situation where the bottle cap strip 5 has a multi-layer wave structure while the connecting strip 3 has a single curved structure.

[0106] As shown in Figures 5 and 8-11, this application discloses a bottle with a flip-top retaining structure for a bottle cap as described above. The bottle body 100 has an external thread 110 at its opening. A support block 311 is provided on the inner side of the plate 31. The support block 311 is located entirely or partially below the folded groove 32. Here, "below" means that the support block 311 is entirely or partially located below the circumferential plane of the folded groove 32. When the cap 1 is assembled to the bottle opening, the lower surface of the support block 311 abuts against the upper surface of the external thread 110. After the plate 31 is bent approximately 90 degrees along the folded groove 32, it continues to be lifted upwards. Based on the lever principle, an upward force is applied to the flip-top, causing partial breakage of the long tear line. Then, only a small force is needed to completely break the long tear line, facilitating opening.

[0107] As shown in Figures 5 and 8-11, to ensure safe use, this application provides a bottle with a flip-top retaining structure using the cap described above, comprising a bottle body 100. The bottle mouth of the bottle body 100 is provided with an external thread 110. The lower part of the external thread 110 is provided with an upper convex ring 120 and a lower convex ring 130, and a limiting groove is formed between the upper convex ring 120 and the lower convex ring 130. The lower inner wall of the cap body 1 is provided with a limiting block 22, which is placed inside the limiting groove after the cap body 1 is assembled to the bottle mouth. When the cap body 1 is rotated in the forward direction and the limiting block 22 is blocked by the lower convex ring 130, the top inner side of the flip-top 3 seals the bottle mouth. When the cap body 1 is rotated in the reverse direction and the limiting block 22 is blocked by the upper convex ring 120, the top inner side of the flip-top 3 separates from the upper wall of the bottle mouth to form a pressure relief gap. A sealing plug 33 is provided on the inner top side of the flip cap 3. When the cap 1 is rotated clockwise so that the limiting block 22 is blocked by the lower convex ring 130, the sealing plug 33 is fully inserted into the bottle mouth to form a seal. When the cap 1 is rotated counterclockwise so that the limiting block 22 is blocked by the upper convex ring 120, the sealing plug 33 partially disengages from the bottle mouth, creating a pressure relief gap between the sealing plug 33 and the bottle mouth. This type of bottle is suitable for holding carbonated beverages and other liquids containing gas. When opening, the cap is rotated first to release pressure, preventing liquid from spraying out when opening.

[0108] In other embodiments, a sealing plug 33 is provided on the inner side of the top of the flip cover 3, and a sealing ring 333 is provided on the outer surface of the sealing plug 33. The sealing ring 333 has an upward pressure relief bend. When the cover 1 is rotated in the forward direction and the limiting block 22 is blocked by the lower convex ring 130, the sealing ring 333 is fully inserted into the bottle mouth to form a seal. When the cover 1 is rotated in the reverse direction and the limiting block 22 is blocked by the upper convex ring 120, the pressure relief bend is completely or partially disengaged from the bottle mouth, so that a pressure relief gap is formed between the pressure relief bend and the bottle mouth.

Claims

1. A flip cover retaining structure of a bottle cap, characterized by The device includes a bottle cap holder (2) and a flip cap (3). A connecting strap (4) is provided between the bottle cap holder (2) and the flip cap (3). When the flip cap (3) is flipped 180 degrees, there is a contact part between the bottle cap holder (2) and the flip cap (3). The tension of the connecting strap (4) causes the contact part to undergo elastic deformation, or the connecting strap (4) is stretched to undergo elastic deformation. When the flip cap (3) is flipped more than 180 degrees, the contact part or the connecting strap (4) rebounds, so that the flip cap (3) is in a force-holding state. The device also includes an integrally formed cap body (1). The cap body (1) is provided with a circumferentially oriented... The long tear line (11) and the short tear line (12) are provided with an inner cut (111) at both ends of the long tear line (11) along the axial direction of the cap body (1) and an outer cut (121) at both ends of the short tear line (12) along the axial direction of the cap body (1). After the long tear line (11) and the short tear line (12) are broken, the upper part of the long tear line (11) and the short tear line (12) constitute the flip cap (3) and the lower part constitutes the bottle cap seat (2). The part between the inner cut (111) and the outer cut (121) constitutes the connecting strip (4).

2. The flip cover retaining structure of a bottle cap according to claim 1, wherein The long tear line (11) has an arc-shaped structure extending from bottom to top at one end near the connecting band (4), and is connected to the inner cut (111). The inner cut (111) is adapted to the arc shape of the long tear line (11) and is a continuation of the long tear line (11).

3. The flip cover retaining structure of claim 1, wherein The connecting strip (4) has a sloping structure that slopes towards the center from bottom to top.

4. The flip cover retaining structure of claim 3, wherein The connecting band (4) is provided with a rib (44) between the inner cut (111) and the outer cut (121); or, the connecting band (4) is provided with a rib (44) between the inner cut (111) and the outer cut (121), and the thickness of the rib (44) gradually decreases from the inner cut (111) to the outer cut (121).

5. A flip cover retaining structure for a bottle cap according to any one of claims 2 to 4, characterized in that The long tear line (11) has a downward bending part (21) in the middle, so that the lower edge of the flap (3) forms a downward protruding plate (31).

6. The flip cover retaining structure of claim 5, wherein A groove (32) is provided between the upper end of the plate (31) and the flip cover (3).

7. The flip cover retaining structure of claim 5, wherein A sealing plug (33) is provided on the inner top side of the flip cover (3); or a sealing plug (33) is provided on the inner top side of the flip cover (3), and the sealing plug (33) is provided with a relief slope (331) at the part corresponding to the plate (31); or a sealing plug (33) is provided on the inner top side of the flip cover (3), and the sealing plug (33) is provided with a downward protruding guide part (332) at the part away from the plate (31); or a sealing plug (33) is provided on the inner top side of the flip cover (3), and a sealing ring (333) is provided on the outer surface of the sealing plug (33).

8. A bottle cap flip-cap retaining structure according to any one of claims 2-4, characterized in that... The short tear line (12) is located on the top surface of the cover (1), and / or the upper end of the connecting strip (4) extends to the top surface of the flip cover (3).

9. A bottle employing a flip-top retaining structure for a bottle cap as described in any one of claims 5-7, characterized in that... Includes a bottle body (100), the bottle mouth of the bottle body (100) is provided with an external thread (110), and a support block (311) is provided on the inner side of the plate (31). When the cap (1) is assembled to the bottle mouth, the lower surface of the support block (311) abuts against the upper surface of the external thread (110).

10. A bottle employing a flip-top retaining structure for a bottle cap as described in any one of claims 2-8, characterized in that... The bottle includes a bottle body (100), the bottle mouth of which is provided with an external thread (110), the lower part of which is provided with an upper convex ring (120) and a lower convex ring (130), and a limiting groove is formed between the upper convex ring (120) and the lower convex ring (130); the lower inner wall of the cap (1) is provided with a limiting block (22) which is placed inside the limiting groove after the cap (1) is assembled to the bottle mouth; when the cap (1) is rotated in the forward direction and the limiting block (22) is blocked by the lower convex ring (130), the top inner side of the flip cap (3) seals the bottle mouth; when the cap (1) is rotated in the reverse direction and the limiting block (22) is blocked by the upper convex ring (120), the top inner side of the flip cap (3) separates from the upper end wall of the bottle mouth to form a pressure relief gap.

11. The bottle of claim 10, wherein A sealing plug (33) is provided on the inner side of the top of the flip cap (3); when the cap (1) is rotated in the forward direction and the limiting block (22) is blocked by the lower convex ring (130), the sealing plug (33) is fully inserted into the bottle mouth to form a seal; when the cap (1) is rotated in the reverse direction and the limiting block (22) is blocked by the upper convex ring (120), the sealing plug (33) is partially disengaged from the bottle mouth, so that a pressure relief gap is formed between the sealing plug (33) and the bottle mouth.

12. A flip cover retaining structure of a bottle cap, characterized by The device includes a bottle cap holder (2) and a flip cap (3). The bottle cap holder (2) and the flip cap (3) are connected by a connecting strap (4). The connecting strap (4) has a crease group consisting of at least two creases, so that the connecting strap (4) forms a structure of at least three segments. Bottle cap straps (5) are provided on both sides of the connecting strap (4). The two ends of the bottle cap straps (5) are respectively connected to the bottle cap holder (2) and the flip cap (3). When the flip cap (3) is opened, the connecting strap (4) is folded along the crease group and the flip cap (3) is pulled by the bottle cap straps (5) to fix the flip cap (3). The connecting strap (4) has at least one scratch along the length direction of the crease group.

13. The flip cover retaining structure of claim 12, wherein The crease group consists of a first crease (401) near the flip cover (3) and a second crease (402) near the bottle cap seat (2). The first crease (401) and the second crease (402) divide the connecting strip (4) into an upper connecting strip (42) connected to the flip cover (3), a lower connecting strip (41) connected to the bottle cap seat (2), and a middle connecting strip (43) located between the first crease (401) and the second crease (402).

14. The flip cover retaining structure of claim 13, wherein The thickness of the connecting strap (42) gradually decreases from the flap (3) toward the first crease (401); And / or, the thickness of the connecting lower strap (41) gradually decreases from the bottle cap seat (2) toward the second crease (402); And / or, the thickness of the strip (43) in the connection gradually increases from the first crease (401) and the second crease (402) on both sides toward the middle.

15. The flip cover retaining structure of claim 12, wherein The bottle cap strap (5) and the connecting strap (4) are an integral structure; And / or, the bottle cap strip (5) and the connecting strip (4) are separate structures, and a gap groove is provided between the bottle cap strip (5) and the connecting strip (4).

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