Cylindrical helical fastening structure

Abstract

The present application discloses a variable-pitch bottle cap. Variable-pitch threads are provided on a bottle neck, corresponding threads are provided in the bottle cap, and the length of each thread among the corresponding threads is less than the quotient obtained by dividing the circumference of the thread by the number of threads. When the bottle cap is screwed into the bottle neck, since the pitch of the front end of an inner thread of the bottle cap is large, for the same angle of rotation, a screw-in distance is larger, and the pitch of the rear end is smaller, so that locking is easily implemented. In the present invention, the bottle cap can be close fit with the bottle neck, so that content does not easily overflow; the bottle cap can be quickly screwed in and does not easily loosen, thereby improving the use convenience of the bottle cap.

Description

Cylindrical helical fastening structure TECHNICAL FIELD

[0001] The present invention relates to a cylindrical helical fastening structure of a bottle cap, in particular, a variable-pitch bottle cap. BACKGROUND

[0002] The cylindrical helical fastening structure is widely used in bottle caps, such as toothpaste bottle caps, ointment bottle caps, and cosmetic bottle caps. The helical fastening structure of the bottle cap is composed of an inner thread and an outer thread that are matched with each other. Usually, the pitches of the threads are equal. The equal pitches facilitate the matching and twisting of the bottle cap and the bottle neck. The bottle cap with equal pitches can be twisted by a distance of one pitch per one turn. For example, the toothpaste cap is usually twisted by two turns to a distance of two pitches, so that the toothpaste tube is deep enough into the bottle cap to avoid the overflow of the toothpaste. TECHNICAL PROBLEM

[0003] Under the condition of the same caliber, increasing the pitch and the number of threads can accelerate the twisting speed of the bottle cap, but is not conducive to the final fastening of the bottle cap and is prone to loosening. TECHNICAL SOLUTION

[0004] The present application provides a cylindrical helical fastening structure of a bottle cap, which is composed of an inner thread and an outer thread that are matched with each other. The thread on the inner thread or the outer thread is a variable-pitch thread with a front end pitch greater than a rear end pitch. The thread on the corresponding outer thread or inner thread is shorter than the length of the thread circumference divided by the number of threads. The present invention defines the starting end of the contact between the outer thread and the inner thread as the front end and the corresponding terminal end as the rear end. The variable-pitch thread is formed by making the pitch of the front end larger and the pitch of the rear end smaller. The length of the thread circumference is the length of the large outer diameter of the thread. For the convenience of description, the thread on the outer thread or the inner thread corresponding to the variable-pitch thread is referred to as the corresponding thread. In order to twist the variable-pitch thread, the length of each thread of the corresponding thread is limited to be shorter than the length of the thread circumference divided by the number of threads. For example, the corresponding thread corresponding to a single-thread variable-pitch thread is shorter than one circumference; the corresponding thread corresponding to a double-thread variable-pitch thread is shorter than 1 / 2 of the circumference; the corresponding thread corresponding to a three-thread variable-pitch thread is shorter than 1 / 3 of the circumference. The length of each thread of the corresponding thread is calculated from the front end or the vicinity close to the front end.

[0005] The following also provides several optional modes, but not as an additional limitation to the above general scheme, but only as a further supplement or preference, without technical or logical contradiction, each optional mode can be combined with the above general scheme, and can also be combined between multiple optional modes.

[0006] Preferably, the variable pitch thread is a gradually variable pitch thread. For example, the thread is gradually reduced in pitch from a larger pitch at the front end to a smaller pitch at the rear end.

[0007] Preferably, the variable pitch thread is a segmented unequal pitch thread. For example, the thread is maintained at a larger pitch for a segment at the front end to facilitate rapid tightening, and is maintained at a smaller pitch for a segment at the rear end to facilitate locking to prevent loosening. The pitch of the corresponding thread is the same as the pitch at the rear end.

[0008] Preferably, the variable pitch thread is a groove-shaped thread, and the corresponding thread on the external or internal screw is a point-shaped thread. The point-shaped thread is actually a segment of the corresponding thread, and is shortened to a small segment that can be inserted into the groove-shaped variable pitch thread, and appears to be a point. For example, the groove-shaped variable pitch thread is provided in the internal screw, and the thread on the external screw is provided as a point-shaped thread. When the internal screw is screwed onto the external screw, the point-shaped thread on the external screw is inserted into the groove-shaped thread in the internal screw and slides along the groove-shaped thread. Since the pitch of the groove-shaped thread at the front end is larger, the same angle of rotation results in a larger tightening distance, and since the pitch at the rear end is smaller, the locking is facilitated and the loosening is prevented.

[0009] The screw fastening structure is applied to a bottle cap.

[0010] The application also provides a fastening structure of a bottle cap, comprising a bottle mouth and a bottle cap, the bottle mouth and the bottle cap each having a cylindrical wall extending at a constant diameter, and the two cylindrical walls are connected by a thread. One of the cylindrical walls is provided with a variable pitch thread having a larger front end pitch than a rear end pitch, and the other cylindrical wall is provided with a corresponding thread, the length of the corresponding thread being shorter than the length of the thread circumference divided by the number of threads.

[0011] Optionally, the variable pitch thread is a gradually variable pitch thread.

[0012] Optionally, the variable pitch thread is a segmented unequal pitch thread.

[0013] Optionally, the segments of the unequal pitch thread are connected end to end.

[0014] Optionally, the pitch of the corresponding thread is the same as the pitch at the rear end.

[0015] Optionally, the variable pitch thread is a groove-shaped thread, and the corresponding thread is a point-shaped thread.

[0016] Optionally, the front end of the variable pitch thread is a flared structure to facilitate the entry of the point-shaped thread.

[0017] Optionally, the variable pitch thread is a male thread or a female thread.

[0018] Optionally, the variable pitch thread is a three-line structure. Advantages

[0019] The variable-pitch bottle cap has the advantages that the bottle opening is easily extended into the bottle cap to a relatively deep position, and the content is not easily spilled out, and the bottle cap is locked tightly and is not easily loosened, and the bottle cap is convenient to use.

[0020] The application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a schematic view of a bottle opening provided with a rectangular thread segment unequal-pitch thread.

[0022] Fig. 2 is a schematic view of a bottle cap matched with the bottle opening shown in Fig. 1.

[0023] Fig. 3 is a schematic view of a bottle cap provided with a groove-shaped variable-pitch thread.

[0024] Fig. 4 is a schematic view of a bottle opening matched with the bottle cap shown in Fig. 3.

[0025] Fig. 5 is a structural view of a bottle body and a bottle cap combined according to an embodiment of the application.

[0026] Fig. 6 is a sectional view along an axis of a part of Fig. 5.

[0027] Fig. 7 is a partial structural view of the bottle body of Fig. 5.

[0028] Fig. 8 is a structural view of the bottle cap of Fig. 5.

[0029] Fig. 9 is a structural view of a bottle body and a bottle cap combined according to an embodiment of the application.

[0030] Fig. 10 is a sectional view along an axis of a part of Fig. 9.

[0031] Fig. 11 is a partial structural view of the bottle body of Fig. 9.

[0032] Fig. 12 is a structural view of the bottle cap of Fig. 9.

[0033] Reference signs in the drawings are explained as follows:

[0034] 1, bottle opening; 2, bottle cap; 31, first segment of rectangular thread segment unequal-pitch thread; 32, second segment of rectangular thread segment unequal-pitch thread; 33, third segment of rectangular thread segment unequal-pitch thread; 4, corresponding thread inside bottle cap; 5, bottle cap two; 6, groove-shaped variable-pitch thread inside bottle cap two; 7, bottle opening two; 8, dot-shaped thread on bottle opening two;

[0035] 100, bottle body; 101, front end; 102, rear end; 110, bottle body; 120, bottle opening; 200, bottle cap;

[0036] 300, variable pitch thread; 310, flared structure; 400, corresponding thread;

[0037] 510, first section; 520, second section; 530, third section; 540, fourth section; 550, fifth section; 560, sixth section;

[0038] 610, first section; 620, second section; 630, third section; 640, fourth section; 650, fifth section; 660, sixth section; 670, seventh section; 680, eighth section. Embodiments of the present application

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] It should be noted that when a component is referred to as being “connected” with another component, it can be directly connected with the other component or there can be a middle component. When a component is referred to as being “disposed on” another component, it can be directly disposed on the other component or there can be a middle component.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0042] In the present application, the terms “first”, “second”, etc. are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number or order of the indicated technical features. Therefore, the features defined with “first”, “second” can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of “plurality” is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0043] Embodiment one

[0044] Figure 1 shows a bottle mouth 1 with three-line rectangular thread segment variable pitch thread. The variable pitch thread is divided into three segments. The first segment 31 at the front end of the bottle mouth 1 is 120 degrees in rotation with equal pitch, and the pitch is the largest. The second segment 32 in the middle is 120 degrees in rotation with equal pitch, but the pitch is half of that of the first segment 31. The third segment 33 at the back end is 60 degrees in rotation with equal pitch, but the pitch is the smallest, half of that of the second segment 32. Figure 2 is a bottle cap 2 that matches the bottle mouth 1 in Figure 1, with three-line rectangular thread corresponding thread 4 on the inside. The length of each line of the corresponding thread is less than 1 / 3 of the circumference of the thread outer diameter, and the pitch is equal to that of the third segment 33 at the back end of the bottle mouth. When the bottle cap 2 is put on the bottle mouth 1, since each line of the thread on the inside of the bottle cap is less than 1 / 3 of the circumference of the thread, there is space for the rectangular thread on the bottle mouth to enter, so it can be twisted in and twisted. Since the pitch at the front end of the bottle mouth is larger, the distance twisted in is larger for the same angle of twist, and the third segment 33 at the back end is easier to lock in because the pitch is smaller and consistent with the pitch of the corresponding thread of the bottle cap, so it is not easy to come off.

[0045] This embodiment has been tested by actual modeling 3D printing. The original equal pitch toothpaste cap needs to be twisted 2 turns 720 degrees for the toothpaste bottle mouth to be twisted in 10 mm. The redesigned variable pitch spiral bottle cap only needs to be twisted more than half a turn to be twisted in 10 mm, and it is not easy to come off.

[0046] Example Two

[0047] Figure 3 shows a bottle cap two 5 with a groove-shaped variable pitch thread. Three-line groove-shaped variable pitch thread 6 is provided inside the bottle cap two 5. Figure 4 shows a bottle mouth two 7 that corresponds to the bottle cap two 5, with three-line point-shaped thread 8 provided thereon. When the bottle mouth two is put on the bottle cap two, the point-shaped thread on the bottle mouth two is embedded in the groove-shaped thread inside the bottle cap two and slides in along the groove-shaped thread. Since the pitch at the front end of the groove-shaped thread is larger, the distance twisted in is larger for the same angle of twist, and the pitch at the back end is smaller, making it easier to lock in and not easy to come off.

[0048] This embodiment has been tested by actual modeling 3D printing, and can be easily and quickly twisted in and locked in. Another advantage of the groove-shaped variable pitch thread is that the inner diameter of the bottle cap and the outer diameter of the bottle mouth can be combined more tightly, making it more difficult for the contents of the bottle to spill out.

[0049] Example Three

[0050] In some application scenarios, further prevention of the bottle cap from coming off is required. A recess that matches the corresponding point-shaped thread can be provided at the end of the groove-shaped variable pitch thread, which further prevents the bottle cap from coming off when the point-shaped thread is embedded in the corresponding recess. This recess that matches the corresponding point-shaped thread constitutes a locking structure that prevents the bottle cap from coming off.

[0051] Example Four

[0052] This is a screw and nut locking device. A variable pitch thread is set on the screw, and the matching nut has a thread length per thread line shorter than the outer diameter circumference of the thread divided by the number of thread lines. This screw and nut structure allows for easy and quick tightening, and can be used in scenarios where high tightening force is not required.

[0053] This application provides a fastening structure for a bottle cap suitable for a bottle body 100. The bottle body 100 includes a bottle body 110 and a bottle opening 120 disposed thereon. The fastening structure for the bottle cap consists of the bottle opening 120 and a bottle cap 200 adapted to be screwed onto it. The bottle opening 120 can be integrally formed with the bottle body 110, and the shape of the bottle body 110 is not limited, making this structure widely applicable to packaging such as toothpaste, cosmetics, or beverages. The materials of the bottle body 100 and the bottle cap 200 can be independently selected from stainless steel, glass, or plastic, etc.

[0054] Both the bottle neck 120 and the bottle cap 200 have cylindrical walls extending with equal diameters, and the two cylindrical walls are connected by threads. One of the bottle neck 120 and the bottle cap 200 is provided with a variable pitch thread (hereinafter referred to as variable pitch thread 300). The variable pitch thread 300 extends helically around its axis and has a front end 101 and a rear end 102 along its own extension direction. The front end 101 is the end that contacts first when the two are joined, and the corresponding end 102 is the rear end. The variable pitch thread 300 has at least two sections of threads with different pitches along its own extension direction. Between adjacent sections of threads, the pitch of the thread at the front end is greater than the pitch of the thread at the rear end. Correspondingly, the other of the bottle neck 120 and the bottle cap 200 is provided with a corresponding thread 400. The pitch of the corresponding thread 400 is equal to the pitch of the thread at the rear end of the variable pitch thread 300. The corresponding thread 400 can be one or more threads, and the length of each thread 400 (the extension length along the helix) is shorter than the major diameter circumference of the thread divided by the number of threads.

[0055] In this application, when the bottle cap 200 is screwed onto the bottle neck 120, the thread pitch at the front end of the variable-pitch thread 300 is larger, while the thread pitch at the rear end is smaller and equal to the pitch of the corresponding thread 400. In the initial stage of screwing the bottle cap 200 onto the bottle neck, the front threads of the corresponding thread 400 and the variable-pitch thread 300 engage, resulting in a greater axial movement distance of the bottle cap 200. When the bottle cap 200 is fully rotated, the corresponding thread 400 and the variable-pitch thread 300 interlock, locking the bottle cap 200 securely and preventing it from easily coming loose.

[0056] In one embodiment, the variable pitch thread 300 can be a convex thread or a concave thread. When the variable pitch thread 300 is a convex thread, the corresponding thread 400 can be either a convex thread or a concave thread; when the variable pitch thread 300 is a concave thread, the corresponding thread 400 is a convex thread. Specific adjustments can be made according to the actual needs of the product. Several thread structures are provided below.

[0057] In one embodiment, the variable pitch thread 300 is a tapered thread, i.e. the thread pitch decreases gradually from front to back. The thread pitch of the corresponding thread 400 is equal to the thread pitch at the end of the variable pitch thread 300.

[0058] In another embodiment, the variable pitch thread 300 is divided into two sections, the front section is a tapered thread, e.g. a linear tapered thread, and the rear section is an equal pitch thread, the thread pitch of which is equal to or smaller than the thread pitch at the end of the linear tapered thread. The thread pitch of the corresponding thread 400 is equal to the thread pitch of the equal pitch thread.

[0059] In one specific calculation example, L = 25 mm, P0= 5 mm, Pn= 55 mm, then P(x) = 5 + 2x mm. The thread pitch of the corresponding thread 400 = 5 mm.

[0060] In one specific calculation example, L = 25 mm, P0= 5 mm, Pn= 55 mm, then P(x) = 5 + 2x mm. The thread pitch of the corresponding thread 400 = 5 mm.

[0061] In other embodiments, the variable pitch thread 300 is a segmented unequal pitch thread, which is divided into at least two sections along the axis, and the adjacent sections are connected end to end except the front and rear sections. In which, the thread pitch in the same section is equal. For example, Figs. 5-8, the bottle mouth 120 is provided with a variable pitch thread 300, specifically, the thread minor diameter is 28 mm, the variable pitch thread 300 is provided with six sections of threads with different thread pitches in sequence from front to back along the axis and the variable pitch thread 300 is a three-line structure. The rotation angle of the first section 510 is 72 degrees, the thread pitch is 72 mm; the rotation angle of the second section 520 is 36 degrees, the thread pitch is 48 mm; the rotation angle of the third section 530 is 36 degrees, the thread pitch is 36 mm; the rotation angle of the fourth section 540 is 36 degrees, the thread pitch is 24 mm; the rotation angle of the fifth section 550 is 18 degrees, the thread pitch is 18 mm; the rotation angle of the sixth section is 90 degrees, the thread pitch is 12 mm; the axial length L of the variable pitch thread 300 is 30 mm. Correspondingly, the bottle cap 200 is provided with a three-line structure of the corresponding thread 400, the thread pitch of the corresponding thread 400 and the sixth section of the variable pitch thread 300 is equal, the thread pitch is 12 mm.

[0062] In other embodiments, as shown in FIGS. 9-12, the outer wall of the bottle mouth 120 has a diameter of 15 mm and is provided with a recess-shaped variable pitch thread 300. The variable pitch thread 300 is a segmented unequal pitch thread and has a three-line structure, is divided into eight segments from front to back, and the pitch decreases gradually. The first segment 510 has a rotation angle of 72 degrees and a pitch of 72 mm; the second segment 520 has a rotation angle of 36 degrees and a pitch of 48 mm; the third segment 530 has a rotation angle of 36 degrees and a pitch of 36 mm; the fourth segment 540 has a rotation angle of 36 degrees and a pitch of 24 mm; the fifth segment 550 has a rotation angle of 36 degrees and a pitch of 18 mm; the sixth segment has a rotation angle of 36 degrees and a pitch of 12 mm; the seventh segment has a rotation angle of 36 degrees and a pitch of 9 mm; the eighth segment has a rotation angle of 90 degrees and a pitch of 6 mm; and the axial length L of the variable pitch thread 300 is 30 mm. The inner wall of the bottle cap 200 is provided with a corresponding thread 400 protruding therefrom, which is a convex point-shaped thread. In fact, it is a segment of thread with a pitch of 6 mm and a rotation angle of 15 degrees. The cross-sectional shape of the thread along the spiral line is rectangular, and the front end and the rear end along the spiral line are rounded for easy rotation.

[0063] When the variable pitch thread 300 is recess-shaped, in order to facilitate engagement, in an embodiment, as shown in FIG. 11, the front end of the variable pitch thread 300 is provided with a flared structure 310 for facilitating the entry of the point-shaped thread.

[0064] The cylindrical spiral fastening structure of the present application adopts a variable pitch structure. Compared with the prior art, at the initial stage of rotation of the bottle cap, the axial movement distance of the bottle cap is greater for the same rotation angle. After rotation to the position, since the pitch is small and the pitches of the respective threads of the bottle cap and the bottle mouth are equal, the bottle cap can be fully locked and is not easy to loosen, thereby improving the convenience of use of the bottle cap.

[0065] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as within the scope of the present disclosure. When the technical features in different embodiments are embodied in the same figure, it is considered that the figure also discloses the combination of the respective embodiments involved.

[0066] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application.

Claims

1. A cylindrical spiral fastening structure composed of an inner screw and an outer screw which are fitted to each other, characterized in that, The thread on the inner or outer screw is variable pitch thread with the front end pitch being greater than the rear end pitch, and the corresponding thread on the outer or inner screw is shorter than the length of the thread circumference divided by the number of thread lines. ​ 2. The helical fastening structure of claim 1 wherein, The variable pitch thread is gradually variable pitch thread.

3. The helical fastening structure of claim 1, wherein, The variable pitch thread is segmented unequal pitch thread.

4. The helical fastening structure of claim 1 wherein, The variable pitch thread is groove-shaped, and the corresponding thread on the outer or inner screw is point-shaped thread.

5. The helical fastening structure of claim 1 wherein, The application is applied to a bottle cap.

6. A bottle cap fastening structure comprising a bottle mouth and a bottle cap, each of the bottle mouth and the bottle cap having a cylindrical wall extending with a constant diameter, the cylindrical walls being connected by a thread, characterized in that, One of the cylindrical walls is provided with variable pitch thread with the front end pitch being greater than the rear end pitch, and the corresponding thread on the other cylindrical wall is shorter than the length of the thread circumference divided by the number of thread lines.

7. The bottle cap fastening structure according to claim 6, wherein The variable pitch thread is gradually variable pitch thread.

8. The bottle cap fastening structure according to claim 6, wherein The variable pitch thread is segmented unequal pitch thread.

9. The bottle cap fastening structure according to claim 6, wherein The unequal pitch thread of each segment is connected end to end.

10. The bottle cap fastening structure according to claim 6, wherein The pitch of the corresponding thread is equal to the rear end pitch.

11. The bottle cap fastening structure according to claim 6, wherein The variable pitch thread is groove-shaped, and the corresponding thread is point-shaped thread.

12. The bottle cap fastening structure according to claim 11, wherein The front end of the variable pitch thread is flared structure for facilitating the point-shaped thread to enter.

13. The bottle cap fastening structure according to claim 6, wherein The variable pitch thread is male thread or female thread.

14. The bottle cap fastening structure according to claim 6, wherein The variable pitch thread is three-line structure.

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