Sealing element and toggle switch

Abstract

The utility model relates to a sealing element and a toggle switch, and belongs to the technical field of switchs.The sealing element comprises a sealing ring body, an annular lip edge extending in the axial direction is arranged on the inner side of the sealing ring body, the annular lip edge and the sealing ring body are in smooth transition connection through a middle lip edge, and the annular section of the middle lip edge is in a U shape; an annular lip opening extending in the radial direction is formed in the inner side of the annular lip edge. When the annular lip opening and the annular lip edge on the sealing element are sleeved on the handle of the toggle switch, a better fitting sealing effect can be achieved, and the wall surface, in contact with the handle, of the sealing element can be automatically compensated to a certain extent after being abraded so as to be elastically tightened and fitted on the surface of the handle to ensure the sealing performance. Meanwhile, the section of the matching ring is the U-shaped middle lip side, so that the annular lip side has good mobility and adaptability relative to the sealing ring body, large tolerance and angle deviation can be compensated, invasion of external splashed water or dust is prevented, and then the use safety and stability can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of switches, and in particular to a sealing member and a toggle switch. Background Art

[0002] A toggle switch is a commonly used switching element in electronic equipment, automation equipment, communication equipment, instrumentation and other industrial control fields. It is mainly used for on-off control of AC and DC power supply circuits. When in use, it can be moved to the appropriate position as needed to achieve functions such as switching lines or turning on and off signals.

[0003] In the related art, the utility model with authorization publication number CN203553007U and the utility model with authorization publication number CN220121722U both disclose a button switch. The former uses a ball head structure on the handle for movable sealing connection, while the latter uses a simple sealing ring structure for sealing connection on the handle. Both have the problem of poor sealing effect and do not have good dustproof and waterproof effects. Their safety and stability in use need to be improved.

[0004] In view of this, there is an urgent need to improve the sealing structure of the button switch in the prior art to improve the sealing performance of the button switch, so that it has better dustproof and waterproof effects, and improve its safety and stability in use. Summary of the invention

[0005] The embodiment of the present application provides a sealing member and a button switch to improve the sealing performance of the button switch, so that the button switch has better dustproof and waterproof effects, thereby improving the safety and stability of use.

[0006] In a first aspect, an embodiment of the present application provides a sealing member, comprising:

[0007] The sealing ring body has an axially extending annular lip on its inner side, the annular lip and the sealing ring body are smoothly connected by an intermediate lip, the ring cross section of the intermediate lip is U-shaped, and an annular lip extending in the radial direction is provided on the inner side of the annular lip.

[0008] In the first aspect, in some embodiments, one end of the annular lip away from the middle lip protrudes from one end of the sealing ring body, and the middle lip protrudes from the other end of the sealing ring body.

[0009] In the first aspect, in some embodiments, the annular lip is trumpet-shaped, and the cross-sectional size of the annular lip gradually decreases in the direction away from the middle lip.

[0010] In the first aspect, in some embodiments, the annular lip is located at an end of the annular lip away from the middle lip.

[0011] In a second aspect, an embodiment of the present application provides a toggle switch, including:

[0012] A shaft sleeve and a compression sleeve are coaxially connected to each other in a detachable manner, and a handle passes through the shaft sleeve and the compression sleeve from top to bottom. The handle is sleeved with a sealing member described in any one of the above items, and a sealing ring body is located between the shaft sleeve and the compression sleeve.

[0013] In the second aspect, in some embodiments, the outer wall of the handle is provided with an annular surface for fitting onto the annular lip, and an annular groove for engaging the annular lip.

[0014] In the second aspect, in some embodiments, a clamping groove for clamping the sealing ring body is formed between the clamping sleeve and the end surface of the shaft sleeve, and the end surface of the shaft sleeve is an annular surface inclined outward away from the axial center line.

[0015] In the second aspect, some embodiments further include a base and an end cover covering the base, the end cover is fixedly connected to the shaft sleeve, a moving contact bridge and a bracket supporting the moving contact bridge are arranged in the base, and a plurality of pins are arranged on the base along the length direction of the moving contact bridge;

[0016] The handle is movably connected to the shaft sleeve via a pin shaft, a pressure rod is axially slidably connected to the lower part of the handle, and an elastic member is provided on the handle to enable the pressure rod to abut against the moving contact bridge.

[0017] In the second aspect, in some embodiments, the end cover is fixed to the base via a buckle cover, a latching position is provided on the base, and a buckle that cooperates with the latching position is provided on the buckle cover.

[0018] In the second aspect, in some embodiments, the end cover is provided with an annular flange that is plugged into the base, and an outer edge for laterally limiting the buckle cover, and the compression sleeve is axially abutted against the buckle cover.

[0019] On the second aspect, in some embodiments, an identification plate serving as a switch direction indicator and a fastening component for axially positioning the identification plate are mounted on the compression sleeve.

[0020] The beneficial effects of the technical solution provided by this application include:

[0021] The embodiment of the present application provides a seal and a button switch. The inner side of the sealing ring body is provided with an axially extending annular lip. The annular lip and the sealing ring body are smoothly connected by an intermediate lip. The ring cross-section of the intermediate lip is U-shaped, and the inner side of the annular lip is provided with an annular lip extending in the radial direction.

[0022] Therefore, when the annular lip and the annular lip edge on the seal are mounted on the handle of the button switch, they can achieve a good fit and sealing effect, and the seal can automatically compensate to a certain extent after the wall surface in contact with the handle is worn, and elastically shrink and fit to the handle surface to ensure the sealing performance. At the same time, with the middle lip edge with a U-shaped ring cross section, the annular lip edge has good mobility and adaptability relative to the sealing ring body, which can compensate for large tolerances and angle deviations, prevent the intrusion of splashing water or dust from the outside, and thus improve the safety and stability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of a seal provided in an embodiment of the present application;

[0025] Figure 2 A structural cross-sectional view of a seal provided in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of the structure of a toggle switch provided in an embodiment of the present application;

[0027] Figure 4 A structural cross-sectional view of a toggle switch provided in an embodiment of the present application;

[0028] Figure 5 A schematic diagram of the structure of a handle provided in an embodiment of the present application;

[0029] Figure 6 A schematic diagram of the structure of the end cover provided in an embodiment of the present application;

[0030] Figure 7 A schematic diagram of the structure of the buckle cover provided in an embodiment of the present application.

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 1. Sealing ring body; 2. Middle lip; 3. Annular lip; 4. Annular lip;

[0033] 5. Bushing; 51. Annular surface; 6. Compression sleeve; 7. Handle; 71. Annular surface; 72. Annular groove; 8. Base; 81. Positioning; 9. End cover; 91. Annular flange; 92. Outer edge;

[0034] 10. Moving contact bridge; 11. Bracket; 12. Pin; 13. Pin shaft; 14. Pressure rod; 15. Elastic part; 16. Buckle cover; 161. Buckle; 17. Identification plate. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] The embodiment of the present application provides a sealing member and a button switch to improve the sealing performance of the button switch, so that the button switch has better dustproof and waterproof effects, thereby improving the safety and stability of use.

[0037] See also Figures 1 to 4 As shown, the first aspect of the embodiment of the present application provides a sealing member, comprising:

[0038] The sealing ring body 1 has an axially extending annular lip 3 on its inner side, the annular lip 3 and the sealing ring body 1 are smoothly connected by an intermediate lip 2, the ring cross section of the intermediate lip 2 is U-shaped, and an annular lip 4 extending in the radial direction is provided on the inner side of the annular lip 3.

[0039] The seal of the embodiment of the present application includes a sealing ring body 1, a middle lip 2, an annular lip 3 and an annular lip 4 which are arranged in sequence from the outside to the inside, and the sealing ring body 1, the middle lip 2, the annular lip 3 and the annular lip 4 are integrally formed. The seal of the present application is installed on the button switch, which has the advantages of good dustproof and waterproof effects, better safety and stability.

[0040] Exemplarily, the seal is made of silicone rubber, which has the advantages of strong corrosion resistance, not easy to age, long service life and good wear resistance. The annular lip 4 and the annular lip edge 3 on the seal are fitted on the handle 7 of the button switch, and the end of the sealing ring body 1 away from the handle 7 is clamped and fixed by the internal structure of the button switch.

[0041] Since the middle lip 2 with a U-shaped ring cross section is connected between the annular lip 3 and the sealing ring body 1, when the handle 7 is swung, the annular lip 3 can swing with the handle 7 in a fitted state, so that the seal has better mobility and adaptability, and can ensure good sealing performance within a certain working pressure and temperature range.

[0042] In addition, since the seal is elastic, it can compensate for larger tolerances and angular deviations, that is, it can better fit the surface of the handle 7. When the wall surface where the seal contacts the handle 7 is worn, it can automatically compensate to a certain extent under the action of elasticity to tighten and fit the surface of the handle 7, thereby ensuring the sealing performance and effectively preventing the intrusion of splashing water or dust from the outside, thereby improving the safety and stability of use.

[0043] In some optional embodiments, see Figures 1 to 4 As shown, an embodiment of the present application provides a seal, wherein one end of the annular lip 3 of the seal away from the middle lip 2 protrudes from one end of the sealing ring body 1, and the middle lip 2 protrudes from the other end of the sealing ring body 1.

[0044] The middle lip 2 on the seal of the embodiment of the present application protrudes from the upper end of the seal ring body 1, and the middle lip 2 protrudes from the lower end of the seal ring body 1. This allows the seal ring body 1 to make room, and within a certain range, the annular lip 3 will not be affected from swinging with the handle 7 of the button switch, so that the seal has good mobility and adaptability. Within a certain range of activity, good sealing performance can be guaranteed.

[0045] In some optional embodiments, see Figures 1 to 4 As shown, an embodiment of the present application provides a seal, the annular lip 3 of the seal is in a trumpet shape, and the cross-sectional size of the annular lip 3 gradually decreases in the direction away from the middle lip 2.

[0046] The annular lip 3 on the seal of the embodiment of the present application is in the shape of a trumpet, and the cross-sectional size of the annular lip 3 gradually decreases in the direction away from the middle lip 2, so that during installation, the inside of the trumpet-shaped annular lip 3 can better expand to fit the outer wall surface of the handle 7 of the button switch, which can compensate for larger tolerances and angular deviations, and ensure that the annular lip 3 has better mobility and adaptability.

[0047] In some optional embodiments, see Figures 1 to 4 As shown, an embodiment of the present application provides a seal, wherein the annular lip 4 of the seal is located at one end of the annular lip 3 away from the middle lip 2 .

[0048] The annular lip 4 on the sealing member of the embodiment of the present application is located at the upper end of the annular lip 3, and the annular lip 4 is away from the middle lip 2. During installation, the annular lip 4 can be engaged with the handle 7 of the button switch. When the annular lip 3 swings with the handle 7, the annular lip 4 at the end is not easily deformed, thereby ensuring good sealing performance when the handle 7 swings.

[0049] See also Figures 1 to 7 As shown, the second aspect of the embodiment of the present application provides a toggle switch, including:

[0050] A shaft sleeve 5 and a compression sleeve 6 are coaxially and detachably connected to each other, and a handle 7 passes through the shaft sleeve 5 and the compression sleeve 6 from top to bottom. The handle 7 is sleeved with a seal of any of the above embodiments, and the sealing ring body 1 is located between the shaft sleeve 5 and the compression sleeve 6.

[0051] The toggle switch of the embodiment of the present application includes a coaxially mounted shaft sleeve 5 and a compression sleeve 6, and the shaft sleeve 5 and the compression sleeve 6 are detachable from each other. A seal of any of the above-mentioned embodiments is mounted on the handle 7, and the handle 7 axially passes through the shaft sleeve 5 and the compression sleeve 6, and the sealing ring body 1 on the seal is clamped and fixed by the shaft sleeve 5 and the compression sleeve 6.

[0052] For example, in this embodiment, the clamping sleeve 6 is threadedly connected to the outer wall of the sleeve 5, and a step surface is provided on the clamping sleeve 6 facing the end face of the sleeve 5. The step surface on the clamping sleeve 6 and the end face of the sleeve 5 form a clamping groove for clamping the sealing ring body 1 on the seal.

[0053] During the specific installation, first put the sealing member onto the corresponding position on the handle 7, then insert the handle 7 into the sleeve 5, so that the sealing ring body 1 abuts against the end face of the sleeve 5, and finally install the clamping sleeve 6 onto the sleeve 5, and clamp and fix the sealing ring body 1 through the step surface on the clamping sleeve 6 and the end face of the sleeve 5.

[0054] In the second aspect, in some optional embodiments: see Figure 4 and Figure 6 As shown, an embodiment of the present application provides a toggle switch, wherein a clamping groove for clamping the sealing ring body 1 is formed between the compression sleeve 6 of the toggle switch and the end surface of the shaft sleeve 5, and the end surface of the shaft sleeve 5 is an annular surface 51 inclined outwardly away from the axis center line.

[0055] The clamping sleeve 6 of the embodiment of the present application is threadedly connected to the outer wall of the sleeve 5, and the end face of the sleeve 5 is an annular surface 51 inclined outward away from the axial center line, so that the notch of the clamping groove formed by the step surface on the clamping sleeve 6 and the end face of the sleeve 5 becomes smaller, and the sealing ring body 1 after clamping and fixing is less likely to slip, thereby ensuring the sealing performance when the handle 7 is swung, and having the advantages of better safety and stability in use.

[0056] In the second aspect, in some optional embodiments: see Figures 1 to 5 As shown, an embodiment of the present application provides a toggle switch, and an annular surface 71 for fitting the annular lip 3 and an annular groove 72 for engaging the annular lip 4 are provided on the outer wall of the handle 7 of the toggle switch.

[0057] The outer wall of the handle 7 of the embodiment of the present application has an annular surface 71 and an annular groove 72. When installed, the annular lip 3 on the seal expands and fits the annular surface 71 on the handle 7 to ensure the fit and seal. The annular lip 4 on the seal is engaged in the annular groove 72 on the handle 7. When the handle 7 swings, the annular lip 3 can be prevented from slipping to a certain extent, further ensuring the fit and seal.

[0058] In the second aspect, in some optional embodiments: see Figure 4 and Figure 6 As shown, the embodiment of the present application provides a toggle switch, which also includes a base 8 and an end cover 9 covering the base 8, the end cover 9 is fixedly connected to the shaft sleeve 5, a moving contact bridge 10 and a bracket 11 supporting the moving contact bridge 10 are provided in the base 8, and a plurality of pins 12 are provided on the base 8 along the length direction of the moving contact bridge 10;

[0059] The handle 7 is movably connected to the shaft sleeve 5 via a pin shaft 13 , a pressure rod 14 is axially slidably connected to the lower part of the handle 7 , and an elastic member 15 is provided on the handle 7 to enable the pressure rod 14 to abut against the moving contact bridge 10 .

[0060] The shaft sleeve 5 of the embodiment of the present application is provided with a radially penetrating mounting hole, and the handle 7 is provided with a radially penetrating through hole, which is located below the annular surface 71. When the handle 7 is inserted into the shaft sleeve 5 for installation, the mounting hole and the through hole are aligned, and then the pin shaft 13 is inserted into the mounting hole and the through hole, so that the handle 7 can swing in the shaft sleeve 5 to realize the swing switch action.

[0061] In this example, the button switch includes a base 8 and an end cover 9 installed on the base 8. The end cover 9 and the lower end of the sleeve 5 are integrally formed. The base 8 has a cavity in it, and a bracket 11 is installed in the cavity. A V-shaped moving contact bridge 10 is placed on the bracket 11, and moving contacts are riveted at both ends of the moving contact bridge 10. Three pins 12 with screws are installed at the bottom end of the base 8, and static contacts in the extended base 8 are riveted on the pins 12.

[0062] A slide groove with a lower opening is provided in the handle 7, and the elastic member 15 is a spring and is installed in the slide groove. The pressure rod 14 extends into the slide groove and a groove with an upper opening is provided on the pressure rod 14. The spring extends into the groove. Under the elastic action of the spring, the pressure rod 14 abuts against the middle of the moving contact bridge 10.

[0063] When the handle 7 swings to the right around the pin 13, the pressure rod 14 slides along the moving contact bridge 10 to the left end of the moving contact bridge 10, and the right end of the moving contact bridge 10 tilts up, so that the left end moving contact contacts the left end static contact, and cooperates with the middle static contact to form a passage with the moving contact bridge 10 through the bracket 11, thereby forming a passage for the two pins 12 on the left side.

[0064] When the handle 7 swings to the left around the pin 13, the pressure rod 14 slides along the moving contact bridge 10 to the right end of the moving contact bridge 10, and the left end of the moving contact bridge 10 tilts up, so that the moving contact at the right end contacts the static contact at the right end, and cooperates with the middle static contact to form a passage with the moving contact bridge 10 through the bracket 11, thereby forming a passage for the two pins 12 on the right side.

[0065] In the second aspect, in some optional embodiments: see Figures 3 to 7 As shown, an embodiment of the present application provides a button switch, the end cover 9 of the button switch is fixed to the base 8 through a buckle cover 16, the base 8 is provided with a latching position 81, and the buckle cover 16 is provided with a buckle 161 that cooperates with the latching position 81.

[0066] The end cover 9 of the button switch of the embodiment of the present application is fastened to the open end of the base 8 through the buckle cover 16, the base 8 is provided with a clamping position 81, and the buckle cover 16 is provided with a buckle 161 for connecting the clamping position 81. Exemplarily, in this embodiment, the clamping position 81 is a protrusion integrally formed on the front and rear walls of the base 8, and the buckle 161 is a U-shaped frame integrally formed on the front and rear sides of the buckle cover 16. When installed, the U-shaped frames on both sides of the buckle cover 16 can be correspondingly hooked on the protrusions on the front and rear walls of the base 8, thereby fastening the end cover 9 to the base 8.

[0067] In the second aspect, in some optional embodiments: see Figures 3 to 7 As shown, an embodiment of the present application provides a button switch, the end cover 9 of which is provided with an annular flange 91 which is plugged into the base 8, and an outer edge 92 for laterally limiting the buckle cover 16, and the clamping sleeve 6 is axially abutted against the buckle cover 16.

[0068] The bottom surface of the end cover 9 of the toggle switch of the present application embodiment is integrally formed with a downwardly protruding annular flange 91, and the top surface is integrally formed with an upwardly protruding outer edge 92. During installation, the annular flange 91 is plugged into the open end of the base 8, and the outer edge 92 is used to prevent the buckle cover 16 from sliding sideways. In this example, the top surface of the buckle cover 16 is flush with the top surface of the outer edge 92. Furthermore, the compression sleeve 6 is threadedly connected to the shaft sleeve 5. During installation, the bottom end of the compression sleeve 6 can axially press the top surface of the buckle cover 16 to ensure the reliability of the buckle cover 16 after installation.

[0069] In the second aspect, in some optional embodiments: see Figure 3 and Figure 4 As shown, the embodiment of the present application provides a toggle switch, on which a compression sleeve 6 is mounted an identification plate 17 for indicating the switch direction, and a fastening component for axially positioning the identification plate 17 .

[0070] The compression sleeve 6 of the toggle switch of the embodiment of the present application is a threaded tube with external threads, and a sign 17 for indicating the switch direction is horizontally passed through the threaded tube, and a fastening component for axially positioning the sign 17 is also installed on the threaded tube. Exemplarily, in this example, the fastening component includes a first nut for supporting the sign 17, and a stop washer and a flat washer coaxially arranged between the first nut and the sign 17 for raising the sign 17, and a second nut for pressing the sign 17 downward is also installed on the threaded tube.

[0071] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0072] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0073] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A seal, It is characterized in that include: A sealing ring body (1) is provided with an axially extending annular lip (3) on its inner side, the annular lip (3) and the sealing ring body (1) are smoothly transitioned and connected via an intermediate lip (2), the intermediate lip (2) has a U-shaped cross section, and an annular lip opening (4) extending in the radial direction is provided on the inner side of the annular lip (3).

2. The seal according to claim 1, Features: One end of the annular lip (3) away from the middle lip (2) protrudes from one end of the sealing ring body (1), and the middle lip (2) protrudes from the other end of the sealing ring body (1).

3. The seal according to claim 1, Features: The annular lip (3) is in a trumpet shape, and the cross-sectional dimensions of the annular lip (3) gradually decrease in a direction away from the middle lip (2).

4. The seal according to claim 1, Features: The annular lip (4) is located at an end of the annular lip (3) away from the middle lip (2).

5. A toggle switch, It is characterized in that include: A shaft sleeve (5) and a compression sleeve (6) are coaxially connected to each other in a detachable manner, and a handle (7) passes through the shaft sleeve (5) and the compression sleeve (6) from top to bottom, wherein the seal according to any one of claims 1 to 4 is mounted on the handle (7), and a sealing ring body (1) is located between the shaft sleeve (5) and the compression sleeve (6).

6. The toggle switch according to claim 5, Features: The outer wall of the handle (7) is provided with an annular surface (71) for fitting the annular lip edge (3), and an annular groove (72) for engaging the annular lip opening (4).

7. The toggle switch according to claim 5, Features: A clamping groove for clamping the sealing ring body (1) is formed between the compression sleeve (6) and the end surface of the shaft sleeve (5), and the end surface of the shaft sleeve (5) is an annular surface (51) that is inclined outward away from the axis.

8. The toggle switch according to claim 5, Features: It also comprises a base (8) and an end cover (9) covering the base (8), wherein the end cover (9) is fixedly connected to the shaft sleeve (5), a moving contact bridge (10) and a bracket (11) supporting the moving contact bridge (10) are arranged in the base (8), and a plurality of pins (12) are arranged on the base (8) along the length direction of the moving contact bridge (10); The handle (7) is movably connected to the shaft sleeve (5) via a pin shaft (13); a pressure rod (14) is axially slidably connected to the lower portion of the handle (7); and an elastic member (15) is provided on the handle (7) for making the pressure rod (14) abut against the moving contact bridge (10).

9. The toggle switch according to claim 8, Features: The end cover (9) is fixed to the base (8) via a buckle cover (16); a clamping position (81) is provided on the base (8); and a buckle (161) matched with the clamping position (81) is provided on the buckle cover (16).

10. The toggle switch according to claim 9, Features: The end cover (9) is provided with an annular flange (91) which is plugged into the base (8), and an outer edge (92) for laterally limiting the buckle cover (16), and the compression sleeve (6) is axially abutted against the buckle cover (16).

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