Wall switch with novel swing structure

Abstract

According to the wall switch with the novel swing structure, the transmission assembly is arranged between the switch panel and the swing piece assembly, when a user presses the switch panel, swing of the panel is transmitted to the swing piece assembly through the transmission assembly, and the swing piece assembly is promoted to swing in the power-on cavity along with the swing piece assembly. And the pendulous reed positioning structures are respectively positioned on two sides of the pendulous reed assembly and are connected with the pendulous reed assembly, so that the position of the pendulous reed assembly can be accurately limited in a pendulous process of the pendulous reed assembly, and poor circuit contact caused by overlarge pendulous amplitude or position offset of the pendulous reed assembly is avoided, thereby ensuring the stability and reliability of the switch in an on-off process, and improving the reliability of the switch. The service life and the safety performance of the switch are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of switch and electrical appliance technology, specifically to a wall switch with a novel swing structure. Background Technology

[0002] In existing technologies, the swing mechanism of wall switches often uses a simple lever or spring reset design. During long-term use, the swing plate assembly is prone to problems such as swing misalignment and poor contact due to a lack of effective positioning. This not only affects the normal switching function of the switch, but may also cause safety hazards due to unstable circuit contact. Utility Model Content

[0003] In view of this, the present invention provides a wall switch with a novel swing structure.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A wall switch with a novel swing structure includes a switch base, a switch panel, and a transmission assembly. The switch panel is swingably mounted on the switch base, and an energized cavity is formed within the switch base. An energized assembly and a swing plate assembly are disposed within the energized cavity. The transmission assembly is disposed between the switch panel and the swing plate assembly, with its two ends connected to the switch panel and the swing plate assembly, respectively. Pressing the switch panel causes the swing plate assembly to swing via the transmission assembly, thereby controlling the on / off state of the circuit within the energized cavity. A swing plate positioning structure is disposed within the energized cavity, located on both sides of the swing plate assembly and connected to it. The swing plate positioning structure limits the position of the swing plate assembly within the energized cavity.

[0006] Preferably, the swing plate positioning structure includes two swing plate positioning blocks symmetrically arranged on both sides of the swing plate assembly, a swing plate positioning groove is formed between the two swing plate positioning blocks, the swing plate assembly is disposed in the swing plate positioning groove, and swing plate grooves are opened on the opposite end faces of the two swing plate positioning blocks, and the two ends of the swing plate assembly extend into the swing plate grooves and connect with the swing plate positioning blocks.

[0007] Preferably, the swing plate and swing groove have an upper groove and a lower groove that are interconnected. The upper groove has an inverted trapezoidal cross-sectional shape, and the lower groove has a rectangular cross-sectional shape. The width of the lower groove is the same as the minimum width of the upper groove. The bottom of both ends of the swing plate assembly extends into the lower groove and connects with the corresponding swing plate positioning block.

[0008] Preferably, the oscillating plate assembly includes an oscillating plate body and an oscillating plate support block. The oscillating plate body is oscillatingly mounted on the oscillating plate support block, and anti-slip textures are provided on the side end face of the oscillating plate support block that is in contact with the oscillating plate body.

[0009] Preferably, the switch base includes an inner base and an outer base, which are detachably connected. The energized cavity is formed inside the inner base, and a transmission groove communicating with the energized cavity is formed on the outer base. The transmission assembly is disposed in the transmission groove, one end of the transmission assembly extends into the energized cavity and connects with the swing plate assembly, and one end of the switch panel extends into the transmission groove and is movably connected with the transmission assembly.

[0010] Preferably, the transmission assembly includes a swing arm and a swing arm transmission component. The swing arm has a swing portion that extends into the energized cavity and a transmission portion disposed above the swing portion and connected to the swing arm transmission component. The swing arm transmission component is oscillatingly disposed in the transmission groove. During the swinging process of the swing arm transmission, the swing arm drives the swing plate assembly to swing.

[0011] Preferably, a swing plate connecting groove is provided on the swing part of the swing rod, and a spring is provided in the swing plate connecting groove. The two ends of the spring are respectively connected to the groove wall of the swing plate connecting groove and the swing plate assembly. A V-shaped opening is provided on one side of the groove wall of the swing plate connecting groove, and one side of the swing plate assembly extends into the V-shaped opening and connects with the swing part.

[0012] Preferably, the inner seat and the outer seat are connected by a snap-fit ​​connection. The inner seat / outer seat is provided with a snap-fit ​​end, and the outer seat / inner seat is provided with a snap-fit ​​connection part corresponding to the snap-fit ​​end. The snap-fit ​​connection part has a slot, and the snap-fit ​​end extends into the snap-fit ​​on the snap-fit ​​connection part and snaps into the inner seat / outer seat.

[0013] Preferably, a seat positioning structure is further provided between the inner seat and the outer seat. The seat positioning structure includes a seat positioning end protruding on the outer seat and a seat positioning groove on the inner seat corresponding to the seat positioning end. Four seat positioning ends are provided and are positioned corresponding to the corners of the inner seat. The seat positioning ends extend into the seat positioning groove and are connected to the inner seat for positioning.

[0014] The beneficial effects of this invention are as follows: By setting a transmission component between the switch panel and the swing plate assembly, when the user presses the switch panel, the panel's swing is transmitted to the swing plate assembly through the transmission component, causing the swing plate assembly to swing within the energized cavity. The swing plate positioning structures are located on both sides of the swing plate assembly and connected to it, enabling precise positioning of the swing plate assembly during its swing. This prevents poor circuit contact caused by excessive swing amplitude or positional deviation, thus ensuring the stability and reliability of the switch during on / off processes and effectively improving the switch's service life and safety performance. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Appendix Figure 2 This is an exploded view of the structure of this utility model;

[0018] Appendix Figure 3 For the appendix Figure 1 Another angle diagram;

[0019] Appendix Figure 4 This is a schematic diagram of the inner seat.

[0020] Appendix Figure 5 This is a schematic diagram of the pendulum rod;

[0021] Appendix Figure 6 This is a schematic diagram showing the exploded structure of the inner and outer base bodies. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] The present invention will now be further described with reference to the accompanying drawings.

[0024] This utility model provides the following technical solution:

[0025] As attached Figure 1-6As shown, this utility model discloses a wall switch with a novel swing structure, including a switch base 1, a switch panel 2, and a transmission assembly 3. The switch panel 2 is swingably mounted on the switch base 1. An energized cavity 4 is formed inside the switch base 1. An energized assembly 5 and a swing plate assembly 6 are disposed inside the energized cavity 4. The transmission assembly 3 is disposed between the switch panel 2 and the swing plate assembly 6. Both ends of the transmission assembly 3 are respectively connected to the switch panel 2 and the swing plate assembly 6. Pressing the switch panel 2 drives the swing plate assembly 6 to swing through the transmission assembly 3, thereby controlling the on / off state of the circuit inside the energized cavity 4. A swing plate positioning structure 61 is disposed inside the energized cavity 4. The swing plate positioning structure 61 is disposed on both sides of the swing plate assembly 6 and connected to the swing plate assembly 6. The swing plate positioning structure 61 limits the position of the swing plate assembly 6 inside the energized cavity 4. Specifically, in this design, a transmission component 3 is installed between the switch panel 2 and the swing plate assembly 6. When the user presses the switch panel 2, the swing of the panel is transmitted to the swing plate assembly 6 through the transmission component 3, causing the swing plate assembly 6 to swing within the energized cavity 4. The swing plate positioning structure 61 is located on both sides of the swing plate assembly 6 and is connected to it. It can accurately limit the position of the swing plate assembly 6 during its swing, preventing poor circuit contact caused by excessive swing amplitude or positional deviation. This ensures the stability and reliability of the switch during the switching process, effectively improving the service life and safety performance of the switch.

[0026] Furthermore, the pendulum positioning structure 61 includes two pendulum positioning blocks 7 symmetrically arranged on both sides of the pendulum assembly 6, forming a pendulum positioning groove 8 between the two pendulum positioning blocks 7. The pendulum assembly 6 is disposed within the pendulum positioning groove 8, and pendulum swing grooves 9 are formed on the opposite end faces of the two pendulum positioning blocks 7. Both ends of the pendulum assembly 6 extend into the pendulum swing grooves 9 and connect with the pendulum positioning blocks 7. Specifically, in this embodiment, the two pendulum positioning blocks 7 are symmetrically distributed on both sides of the pendulum assembly 6, and the pendulum positioning groove 8 formed between them provides installation space for the pendulum assembly 6, ensuring that the pendulum assembly 6 can move stably within the groove. The pendulum swing grooves 9 are formed on the opposite end faces of the pendulum positioning blocks 7, and both ends of the pendulum assembly 6 extend into the swing grooves. This structural design prevents the pendulum assembly 6 from swinging with excessive amplitude or deflection, and the inner wall of the swing groove can limit the movement trajectory of the pendulum assembly 6. Meanwhile, the two symmetrically arranged pendulum positioning blocks 7 can also clamp the pendulum assembly 6 from both sides, further enhancing the stability of the pendulum assembly 6 in the power-on cavity 4 and preventing it from loosening due to vibration or external force during long-term use, thereby ensuring the accuracy and stability of circuit on / off control.

[0027] Furthermore, the swing plate groove 9 has an upper groove 10 and a lower groove 11 that are interconnected. The upper groove 10 has an inverted trapezoidal cross-sectional shape, and the lower groove 11 has a rectangular cross-sectional shape. The width of the lower groove 11 is the same as the minimum width of the upper groove 10. The bottom ends of the swing plate assembly 6 extend into the lower groove 11 and connect with the corresponding swing plate positioning block 7. Specifically, in this embodiment, the upper groove 10 of the swing plate groove 9 is designed as an inverted trapezoid, which can provide sufficient space for the swing of the swing plate assembly 6 at both ends, avoiding a hard collision between the swing plate assembly 6 and the swing plate positioning block 7 when the swing reaches its limit position, thus playing a buffering role. The rectangular cross-section of the lower groove 11 is adapted to the bottom ends of the swing plate assembly 6. After the bottom of the swing plate assembly 6 extends into the lower groove 11, the inner wall of the lower groove 11 can limit the swing plate assembly 6 from the horizontal and vertical directions, preventing the swing plate assembly 6 from swaying left and right or moving up and down during the swing. Meanwhile, the width of the lower groove 11 is the same as the minimum width of the upper groove 10, which makes the movement trajectory of the swing plate assembly 6 smoother during the transition from the lower groove 11 to the upper groove 10, without any jamming. This ensures the smooth swing of the swing plate assembly 6, thereby improving the feel and response speed of the entire switch operation. This groove structure design, which is wider at the top and narrower at the bottom, not only meets the space requirements of the swing plate assembly 6 when swinging, but also ensures the stability of the position of the swing plate assembly 6 through the precise limiting of the lower groove 11, effectively enhancing the overall reliability of the swing plate positioning structure 61.

[0028] Furthermore, the oscillating plate assembly 6 includes an oscillating plate body 12 and an oscillating plate support block 13. The oscillating plate body 12 is oscillatingly mounted on the oscillating plate support block 13, and anti-slip textures 14 are provided on the end face of the oscillating plate support block 13 that contacts the oscillating plate body 12. Specifically, in this embodiment, the oscillating plate support block 13 serves as the mounting base for the oscillating plate body 12, providing it with a stable support platform. The anti-slip textures 14 increase the friction between the oscillating plate body 12 and the oscillating plate support block 13. When the oscillating plate body 12 oscillates on the oscillating plate support block 13, it effectively prevents relative sliding between the oscillating plate body 12 and the support block, ensuring that the oscillation action of the oscillating plate body 12 can be transmitted accurately and stably, avoiding oscillation delay or positional deviation caused by sliding, thereby further improving the accuracy and reliability of the oscillating plate assembly 6 in the circuit switching control process. At the same time, the anti-slip textures 14 can also disperse the pressure on the contact surface between the oscillating plate body 12 and the support block to a certain extent, reducing wear during long-term use and extending the overall service life of the oscillating plate assembly 6.

[0029] Furthermore, the switch base 1 includes an inner base 15 and an outer base 16, which are detachably connected. The energized cavity 4 is formed inside the inner base 15, and a transmission groove 17 communicating with the energized cavity 4 is formed on the outer base 16. The transmission component 3 is disposed in the transmission groove 17, with one end of the transmission component 3 extending into the energized cavity 4 and connecting with the oscillating plate component 6. One end of the switch panel 2 extends into the transmission groove 17 and is movably connected with the transmission component 3. Specifically, in this embodiment, the inner base 15 and the outer base 16 are detachably connected, which facilitates separation during switch installation or maintenance. This allows for the inspection or replacement of core components such as the energized component 5 and the oscillating plate component 6 within the energized cavity 4 without the need to completely disassemble the switch base 1, greatly improving the convenience of installation and maintenance. The transmission groove 17 on the outer base 16 provides an installation channel for the transmission component 3. One end of the transmission component 3 passes through the transmission groove 17 and extends into the energized cavity 4 to connect with the swing plate assembly 6, while the other end is movably connected to the switch panel 2 extending into the transmission groove 17. This structural design allows the swing of the switch panel 2 to be accurately transmitted to the swing plate assembly 6 through the transmission component 3 within the transmission groove 17. At the same time, the transmission groove 17 also guides the movement of the transmission component 3, preventing deviation or jamming during transmission and ensuring smooth switch operation. In addition, the separate structure of the outer base 16 and the inner base 15 can save material costs.

[0030] Furthermore, the transmission assembly 3 includes a swing arm 18 and a swing arm transmission component 19. The swing arm 18 has a swing portion 20 extending into the energized cavity and a transmission portion 21 disposed above the swing portion 20 and connected to the swing arm transmission component 19. The swing arm transmission component 19 is oscillatingly disposed within the transmission groove 17. During the oscillation of the swing arm 18, the swing arm 18 drives the swing plate assembly to oscillate. Specifically, in this embodiment, the swing arm transmission component 19 serves as an intermediate component connecting the switch panel 2 and the swing arm 18. One end of the component is movably connected to the switch panel 2, and the other end is connected to the transmission portion 21 of the swing arm 18. When the user presses the switch panel 2, the oscillation of the panel drives the swing arm transmission component 19 to rotate around its own axis within the transmission groove 17, thereby driving the swing portion 20 of the swing arm 18 to oscillate synchronously within the energized cavity 4 via the transmission portion 21. The swing part 20 is directly connected to the swing plate assembly 6, and its swing motion is directly transmitted to the swing plate assembly 6, causing the swing plate assembly 6 to complete the circuit on / off control under the limit of the swing plate positioning structure 61.

[0031] Specifically, the rocker arm transmission component 19 is provided with a swing end 28, and the wall of the transmission groove 17 is provided with a swing hole 29 corresponding to the swing end 28. The swing end 28 extends into the swing hole 29 and is rotatably connected to the transmission groove 17, so that the rocker arm transmission component 19 can swing flexibly within the transmission groove 17 with the swing end 28 as the axis. Similarly, the rocker arm 18 protrudes to form a rocker arm connection end 30, and the wall of the central part of the transmission groove 17 is provided with a rocker arm hole 31 corresponding to the rocker arm connection end 30. The rocker arm connection end 30 extends into the rocker arm hole 31 and is rotatably connected to the wall of the transmission groove 17, so that the rocker arm 18 can swing with the rocker arm connection end 30 as the axis. This double rotational connection structure ensures that the rocker arm transmission component 19 and the rocker arm 18 can rotate flexibly during transmission, reduce transmission resistance, and enable the operating force of the switch panel 2 to be efficiently transmitted to the rocker plate assembly 6.

[0032] Furthermore, a swing plate connecting groove 22 is provided on the swing portion 20 of the swing rod 18. A spring 23 is provided in the swing plate connecting groove 22. The two ends of the spring 23 are respectively connected to the groove wall of the swing plate connecting groove 22 and the swing plate assembly 6. A V-shaped opening 24 is provided on one side of the groove wall of the swing plate connecting groove 22. One side of the swing plate assembly 6 extends into the V-shaped opening 24 and connects with the swing portion 20. Specifically, in this embodiment, the spring 23 can act as a transmission structure to drive the swing plate body 12 to swing. The V-shaped opening 24 on one side of the groove wall of the swing plate connecting groove 22 can connect with the swing plate body 12 when the force of the spring 23 is insufficient, thereby driving the swing plate body 12 to swing. This forcibly separates the silver point on the swing plate body 12 from the silver point on the energizing component 5, avoiding the problem of incomplete power disconnection caused by the silver point sticking when the circuit is disconnected, and improving the safety performance of the switch.

[0033] Furthermore, the inner seat 15 and the outer seat 16 are connected by a snap-fit ​​connection. The inner seat 15 / outer seat 16 is provided with a snap-fit ​​end 25, and the outer seat 16 / inner seat 15 is provided with a snap-fit ​​connecting part 26 corresponding to the snap-fit ​​end 25. The snap-fit ​​connecting part 26 has a latch 27, and the snap-fit ​​end 25 extends into the snap-fit ​​on the snap-fit ​​connecting part 26 to snap-fit ​​with the inner seat 15 / outer seat 16. Specifically, in this embodiment, the snap-fit ​​connection method is simple to operate, and the inner seat 15 and outer seat 16 can be quickly assembled and disassembled without additional tools. The snap-fit ​​end 25 is designed as a protruding structure with a certain degree of elasticity. When the inner seat 15 and the outer seat 16 are mated, the snap-fit ​​end 25 undergoes elastic deformation under external force, smoothly extending into the latch 27 of the snap-fit ​​connection part 26. After the position is in place, the snap-fit ​​end 25 returns to its original shape and locks tightly against the inner wall of the latch 27, thereby firmly connecting the inner seat 15 and the outer seat 16. This connection structure not only ensures the stability of the connection between the two and prevents separation due to vibration or other factors during use, but also facilitates easy disassembly of the inner seat 15 and the outer seat 16 by applying a reverse force to deform the snap-fit ​​end 25 again when maintenance is required, further improving the overall assembly efficiency and maintenance convenience of the switch.

[0034] Furthermore, a seat positioning structure is provided between the inner seat 15 and the outer seat 16. This seat positioning structure includes a seat positioning end 34 protruding from the outer seat 16 and a seat positioning groove 35 on the inner seat 15 corresponding to the seat positioning end 34. Four seat positioning ends 34 are provided, corresponding to the corner positions of the inner seat 15. Each seat positioning end 34 extends into the seat positioning groove 35 and is positioned to connect with the inner seat 15. Specifically, in this embodiment, the four seat positioning ends 34 correspond to the four corner positions of the inner seat 15. When assembling the inner seat 15 and the outer seat 16, the seat positioning ends 34 can be accurately inserted into the seat positioning grooves 35, initially defining the relative positions of the two in space and preventing misalignment between the inner seat 15 and the outer seat 16 during the snap-fit ​​connection process. The engagement of the positioning end 34 and the positioning groove 35 ensures accurate alignment between the energized cavity 4 and transmission groove 17 on the inner seat 15 and their corresponding components on the outer seat 16. This prevents problems such as misalignment during assembly, which could lead to improper installation of the transmission assembly 3 or mismatch between the sway assembly 6 and the energized assembly 5. Simultaneously, the positioning structures at the four corners enhance the overall structural strength of the inner seat 15 and outer seat 16 after connection, making them less prone to relative displacement under external impact, further ensuring the stability and reliability of the internal components of the switch. This combination of positioning structure and snap-fit ​​connection provides dual protection, improving assembly accuracy and enhancing connection stability, thus offering strong support for the long-term stable operation of the switch.

[0035] The wall switch also includes a pressure plate 32 and a steel frame 33. The pressure plate 32 is disposed between the switch panel 2 and the base 1, and the steel frame 33 is disposed on the base.

[0036] Specifically, the power-conducting component 5 is a copper sheet as in the prior art, so it will not be described in detail here.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wall switch with a novel swing structure, comprising a switch base, a switch panel, and a transmission assembly, wherein the switch panel is swingably mounted on the switch base, an energized cavity is formed within the switch base, an energized assembly and a swing plate assembly are disposed within the energized cavity, and the transmission assembly is disposed between the switch panel and the swing plate assembly, with both ends of the transmission assembly connected to the switch panel and the swing plate assembly respectively; pressing the switch panel causes the swing plate assembly to swing via the transmission assembly, thereby controlling the on / off state of the circuit within the energized cavity, characterized in that: The energized cavity is provided with a pendulum positioning structure, which is located on both sides of the pendulum assembly and connected to the pendulum assembly. The pendulum positioning structure limits the position of the pendulum assembly in the energized cavity.

2. The wall switch with a novel swing structure according to claim 1, characterized in that: The swing plate positioning structure includes two swing plate positioning blocks symmetrically arranged on both sides of the swing plate assembly. A swing plate positioning groove is formed between the two swing plate positioning blocks. The swing plate assembly is disposed in the swing plate positioning groove. Swing plate grooves are opened on the opposite end faces of the two swing plate positioning blocks. Both ends of the swing plate assembly extend into the swing plate grooves and connect with the swing plate positioning blocks.

3. The wall switch with a novel swing structure according to claim 2, characterized in that: The swing plate and swing groove have an upper groove and a lower groove that are interconnected. The upper groove has an inverted trapezoidal cross-sectional shape, and the lower groove has a rectangular cross-sectional shape. The width of the lower groove is the same as the minimum width of the upper groove. The bottom of both ends of the swing plate assembly extends into the lower groove and connects with the corresponding swing plate positioning block.

4. The wall switch with a novel swing structure according to any one of claims 1-3, characterized in that: The oscillating plate assembly includes an oscillating plate body and an oscillating plate support block. The oscillating plate body is oscillatingly mounted on the oscillating plate support block, and anti-slip textures are provided on the side end face of the oscillating plate support block that is in contact with the oscillating plate body.

5. The wall switch with a novel swing structure according to claim 1, characterized in that: The switch base includes an inner base and an outer base, which are detachably connected. The energized cavity is formed inside the inner base, and a transmission groove communicating with the energized cavity is formed on the outer base. The transmission component is disposed in the transmission groove, one end of the transmission component extends into the energized cavity and connects with the swing plate component, and one end of the switch panel extends into the transmission groove and is movably connected with the transmission component.

6. The wall switch with a novel swing structure according to claim 1, characterized in that: The transmission assembly includes a swing arm and a swing arm transmission component. The swing arm has a swinging part that extends into the energized cavity and a transmission part that is disposed above the swinging part and connected to the swing arm transmission component. The swing arm transmission component is oscillatingly disposed in the transmission groove. During the swinging process of the swing arm transmission, the swing arm drives the swing plate assembly to swing.

7. The wall switch with a novel swing structure according to claim 6, characterized in that: The swing arm has a swing plate connecting groove on its swing part. A spring is installed in the swing plate connecting groove. The two ends of the spring are respectively connected to the groove wall of the swing plate connecting groove and the swing plate assembly. A V-shaped opening is opened on one side of the groove wall of the swing plate connecting groove. One side of the swing plate assembly extends into the V-shaped opening and connects with the swing part.

8. The wall switch with a novel swing structure according to claim 5, characterized in that: The inner seat and the outer seat are connected by a snap-fit ​​connection. The inner seat / outer seat is provided with a snap-fit ​​end, and the outer seat / inner seat is provided with a snap-fit ​​connection part corresponding to the snap-fit ​​end. The snap-fit ​​connection part has a slot, and the snap-fit ​​end extends into the snap-fit ​​on the snap-fit ​​connection part and snaps into the inner seat / outer seat.

9. The wall switch with a novel swing structure according to claim 8, characterized in that: A seat positioning structure is also provided between the inner seat and the outer seat. The seat positioning structure includes a seat positioning end protruding on the outer seat and a seat positioning groove on the inner seat corresponding to the seat positioning end. Four seat positioning ends are provided and are positioned corresponding to the corners of the inner seat. The seat positioning ends extend into the seat positioning groove and are connected to the inner seat for limiting.

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