Waterproof and anti-siphon wire harness for vehicle control

Abstract

The utility model discloses a vehicle control waterproof anti-siphon wire harness, comprising a bottom shell provided with a mounting cavity, and positioning convex parts formed on the inner walls of the two sides of the mounting cavity; the PCB is installed in the installation cavity in an embedded mode, the two sides of the PCB make contact with the inner walls of the two sides of the installation cavity, and the positioning grooves in the two sides of the PCB and the positioning protruding parts are positioned in an embedded mode; one end of the first cable is arranged in the mounting cavity in a penetrating manner and is welded, fixed and conducted with the PCB; one end of the second cable is arranged in the mounting cavity in a penetrating manner and is welded and conducted with the PCB, and the second cable and the first cable are conducted through the PCB and are separated by the PCB; the upper cover is fixed at the upper end of the bottom shell and tightly presses the first cable and the second cable; and the colloid is formed after sealant is poured into the mounting cavity and cured, the exterior of the PCB and the peripheries of the end parts of the first cable and the second cable are completely wrapped by the colloid, and the gap between the upper cover and the bottom shell is filled with the colloid. The utility model can realize waterproof and anti-siphon functions, and has a stable structure.

Description

Technical fields:

[0001] This utility model relates to the field of wiring harness technology, and specifically to a waterproof and anti-siphon wiring harness for vehicle control. Background technology:

[0002] Chinese utility model patent application number 202223472464.1 discloses an anti-siphon electrical connection wire, which includes a first wire and a second wire. The first wire has an exposed first metal end at its first conductive wire end, and the second wire has an exposed second metal end at its second conductive wire end. Each first metal end and a second metal end are electrically connected via a conductive clip. A separator is provided between the first and second wires to separate each conductive connection point. An injection-molded connecting layer is provided outside the separator, encasing the extended first and second conductive wires, the separator, and connecting the first and second wires into one unit. Because the first and second conductive wires are disconnected from each other but connected and conductive via the conductive clip, and because the outer portions of the first and second conductive wires are cut off, a complete pressure chamber cannot be formed. Therefore, when siphoning occurs at this part, it is interrupted, and moisture will not enter the lamp body. The first conductive wire and the conductive clip are sealed with an insulating layer, and the second conductive wire and the conductive clip are sealed with an insulating layer, further sealing to prevent the re-formation of a connected space and avoid the re-formation of siphoning.

[0003] The aforementioned electrical connection wires can prevent siphoning, but a conductive buckle is required to connect and conduct the disconnected first and second conductive wires. However, the conductive buckle is small in size, making it inconvenient to operate. Furthermore, the structure of the first and second conductive wires and the conductive buckle is not stable enough, affecting product quality. In addition, a molded connection layer needs to be injection molded on the outside of the separator, the first wire, and the second wire. When molding the injection connection layer, the separator, the first wire, and the second wire need to be positioned inside the injection mold, making the injection mold more complex, with high manufacturing costs and low efficiency.

[0004] In view of the above, the inventors propose the following technical solution. Utility model content:

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a vehicle control waterproof and anti-siphon wiring harness.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a vehicle control waterproof and anti-siphon wiring harness includes: a bottom shell, which has an installation cavity inside, and positioning protrusions are formed on both sides of the inner wall of the installation cavity; a PCB board, which is embedded in the installation cavity of the bottom shell, and the two sides of the PCB board are in contact with the two sides of the inner wall of the installation cavity, and the positioning grooves on both sides of the PCB board are embedded and positioned with the positioning protrusions; a first cable, one end of which passes through the installation cavity of the bottom shell and is welded and fixed to the PCB board for conduction; a second cable, one end of which passes through the installation cavity of the bottom shell and is welded and fixed to the PCB board for conduction, and the second cable and the first cable are conducted through the PCB board and separated by the PCB board; a top cover, which is fixed to the upper end of the bottom shell and presses on the upper ends of the first cable and the second cable to compress the first cable and the second cable; and an adhesive, which is formed by injecting sealant into the installation cavity and curing it, the adhesive completely covering the outside of the PCB board and the outer periphery of the ends of the first cable and the second cable, and filling the gap between the top cover and the bottom shell.

[0007] Furthermore, in the above technical solution, the bottom shell is integrally formed with an upwardly protruding support platform at the bottom of the mounting cavity, and an upwardly protruding positioning post is integrally formed on the support platform; the PCB board is provided with positioning holes for the positioning post, the PCB board is sleeved on the outside of the positioning post through the positioning holes, and the lower end face of the PCB board also abuts against the upper end face of the support platform to be supported by the support platform, so that a gap is formed between the lower end face of the PCB board and the bottom of the mounting cavity to suspend it in the mounting cavity, and the colloid is also filled in the gap to wrap the outside of the PCB board.

[0008] Furthermore, in the above technical solution, the lower end face of the upper cover is formed with a positioning platform that protrudes downward and is adapted to the positioning post. The positioning platform abuts against the upper part of the positioning post and presses against the surface of the PCB board.

[0009] Furthermore, in the above technical solution, the upper periphery of the bottom shell is provided with multiple limiting grooves; the lower end face of the upper cover is formed with multiple fixing posts that are adapted to the limiting grooves, and the fixing posts are embedded and fixed in the limiting grooves, so that the upper cover is positioned at the upper end of the bottom shell, and the upper cover and the bottom shell are also fixed together by ultrasonic melting.

[0010] Furthermore, in the above technical solution, the upper cover is provided with an injection hole that penetrates the installation cavity and is used for injecting sealant, wherein the sealant is epoxy resin sealant.

[0011] Furthermore, in the above technical solution, the two ends of the mounting cavity are respectively provided with a first U-shaped wire groove and a second U-shaped wire groove; the two ends of the lower surface of the upper cover are respectively provided with a first arc-shaped protrusion and a second arc-shaped protrusion corresponding to the first U-shaped wire groove and the second U-shaped wire groove; the first cable passes through the first U-shaped wire groove, the first arc-shaped protrusion presses on the upper end of the first cable, and the adhesive also fills the first gap between the first cable and the first U-shaped wire groove, and the second gap between the first arc-shaped protrusion and the first cable; the second cable passes through the second U-shaped wire groove, the second arc-shaped protrusion presses on the upper end of the second cable, and the adhesive also fills the third gap between the second cable and the second U-shaped wire groove, and the fourth gap between the second arc-shaped protrusion and the second cable.

[0012] Furthermore, in the above technical solution, the other end of the first cable connected to the PCB board is at least divided into a first wire and a second wire, and the first wire and the second wire are respectively connected to a first plug and a second plug with different structures.

[0013] Furthermore, in the above technical solution, the other end of the second cable connected to the PCB board is at least divided into a third wire and a fourth wire, which are respectively connected to a third plug and a fourth plug with different structures.

[0014] Furthermore, in the above technical solution, the bottom shapes of the first U-shaped cable groove and the second U-shaped cable groove are respectively adapted to the first cable and the second cable; the first arc-shaped protrusion and the second arc-shaped protrusion respectively have a first arc-shaped surface and a second arc-shaped surface with shapes respectively adapted to the first cable and the second cable.

[0015] Furthermore, in the above technical solution, the two ends of the mounting cavity are respectively formed with a first extension seat and a second extension seat extending from the outside to the inside and used to support and position the first cable and the second cable, respectively. The first U-shaped cable groove and the second U-shaped cable groove extend through the inner side surfaces of the first extension seat and the second extension seat.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0017] 1. The PCB board is embedded in the mounting cavity of the bottom shell, with both sides of the PCB board in contact with the inner walls of the mounting cavity. The positioning grooves and positioning protrusions on both sides of the PCB board are embedded and positioned to ensure that the PCB board will not move left or right after being installed in the mounting cavity of the bottom shell, thus ensuring the stability of the assembly structure, facilitating subsequent glue filling, and improving product quality.

[0018] 2. The second cable is connected to and separated from the first cable by a PCB board, preventing the gaps within the first and second cables from forming a complete pressure chamber. Therefore, when siphoning occurs at this point, the connection is broken, preventing further moisture entry and achieving anti-siphoning. Furthermore, both the first and second cables are fixed to the PCB board by soldering, which is more convenient and efficient than using conductive clips, and the soldering structure is stable, ensuring reliable conductivity.

[0019] 3. This utility model uses a potting method to form a colloid in the mounting groove, and the colloid completely covers the outside of the PCB board and the outer periphery of the ends of the first and second cables, especially the welding parts of the first and second cables to the PCB board. This not only enhances the stability of the assembly structure, but also has ideal impact resistance and waterproof performance, thus improving product quality. Attached image description:

[0020] Figure 1 This is a perspective view of the present invention;

[0021] Figure 2 This is a perspective view of the present invention from another angle;

[0022] Figure 3 This is an exploded view of the present invention (without a plug);

[0023] Figure 4 This is a structural diagram of the present invention after the top cover is removed (without the plug);

[0024] Figure 5 This is a structural diagram of the upper cover in this utility model;

[0025] Figure 6 This is a structural diagram of the bottom shell of this utility model. Detailed implementation method:

[0026] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0027] See Figure 1-6 As shown, a vehicle control waterproof and anti-siphon wiring harness includes: a bottom shell 1, a PCB board 2, a first cable 3, a second cable 4, a top cover 5, and an adhesive 6.

[0028] The bottom shell 1 has an internal mounting cavity 11, and positioning protrusions 12 are formed on both sides of the inner wall of the mounting cavity 11. The PCB board 2 is embedded in the mounting cavity 11 of the bottom shell 1, and the two sides of the PCB board 2 are in contact with the inner walls of the mounting cavity 11. The positioning grooves 21 on both sides of the PCB board 2 are embedded and positioned with the positioning protrusions 12, so as to ensure that the PCB board 2 will not move left or right after being installed in the mounting cavity 11 of the bottom shell 1, thus ensuring the stability of the assembly structure, facilitating subsequent glue filling, and improving product quality.

[0029] The first cable 3 and the second cable 4 can be formed by cutting a single cable. One end of the first cable 3 passes through the mounting cavity 11 of the bottom shell 1 and is soldered and fixed to the PCB board 2 for conductivity. One end of the second cable 4 also passes through the mounting cavity 11 of the bottom shell 1 and is soldered and fixed to the PCB board 2 for conductivity. The second cable 4 and the first cable 3 are connected through the PCB board 2 and separated by it, preventing the gaps within the first cable 3 and the second cable 4 from forming a complete pressure chamber. Therefore, when siphoning occurs at this point, it is interrupted, preventing moisture from entering further, thus achieving the purpose of preventing siphoning. Furthermore, both the first cable 3 and the second cable 4 are fixed to the PCB board 2 by soldering, which is more convenient and efficient than using conductive clips, and the soldering structure is stable, providing stable and reliable conductivity.

[0030] The upper cover 5 is fixed to the upper end of the bottom shell 1 and presses against the upper ends of the first cable 3 and the second cable 4 to compress the first cable 3 and the second cable 4, ensuring a more stable assembly mechanism. The assembly structure of the bottom shell 1 and the upper cover 5 is as follows: the upper periphery of the bottom shell 1 is provided with multiple limiting grooves 15; the lower end surface of the upper cover 5 is formed with multiple fixing posts 52 that are adapted to the limiting grooves 15. These fixing posts 52 are embedded and fixed in the limiting grooves 15, positioning the upper cover 5 at the upper end of the bottom shell 1, preventing misalignment during assembly and ensuring the accuracy of the assembly structure. Furthermore, the upper cover 5 and the bottom shell 1 are also fixed together by ultrasonic melting, resulting in a stable and robust assembly structure that improves product quality.

[0031] The assembly structure of the bottom shell 1, PCB board 2 and top cover 5 is as follows: The bottom shell 1 has two upwardly protruding support platforms 13 integrally formed at the bottom of the mounting cavity 11, and the support platforms 13 also have upwardly protruding positioning posts 14 integrally formed on them; The PCB board 2 is provided with positioning holes 22 for the positioning posts 14. The PCB board 2 is sleeved on the outside of the positioning posts 14 through the positioning holes 22, and the lower end face of the PCB board 2 also abuts against the upper end face of the support platform 13 to be supported by the support platform 13, so that a gap is formed between the lower end face of the PCB board 2 and the bottom of the mounting cavity 11 to suspend it in the mounting cavity 11. This ensures that the PCB board 2 is stably positioned in the mounting cavity 11 of the bottom shell 1, and the support platform 13 stably supports the PCB board 2. The positioning posts 14 are assembled with the positioning holes 22 of the PCB board 2 to stably position the PCB board 2. The colloid 6 is also filled in the gap to wrap the outside of the PCB board 2.

[0032] Furthermore, the lower end face of the upper cover 5 is formed with a downwardly protruding positioning platform 51 that is adapted to the positioning post 14. The positioning platform 51 abuts against the upper surface of the positioning post 14 and presses against the upper surface of the PCB board 2, thereby ensuring that the PCB board 2 is stably installed in the bottom shell 1. This facilitates the subsequent injection of sealant to form an adhesive, ensuring that the adhesive completely covers the outside of the PCB board 2 and the outer periphery of the ends of the first cable 3 and the second cable 4. The positioning platform 51 also has a groove, which is fitted around the upper periphery of the positioning post 14 to form a stable assembly.

[0033] The colloid 6 is formed by injecting sealant into the mounting cavity 11 and allowing it to cure. This colloid 6 completely covers the exterior of the PCB board 2 and the outer periphery of the ends of the first cable 3 and the second cable 4, and fills the gap between the upper cover 5 and the bottom shell 1. This invention uses a potting method to form the colloid in the mounting groove, and the colloid completely covers the exterior of the PCB board 2 and the outer periphery of the ends of the first cable 3 and the second cable 4, especially covering the solder joints of the first cable 3 and the second cable 4 with the PCB board 2. This not only enhances the stability of the assembly structure but also provides ideal impact resistance and waterproof performance, improving product quality.

[0034] The upper cover 5 is provided with an injection hole 53 that passes through the mounting cavity 11 and is used for injecting sealant, wherein the sealant is epoxy resin sealant.

[0035] The mounting cavity 11 has a first U-shaped wire groove 111 and a second U-shaped wire groove 112 at both ends, respectively. The bottom shapes of the first U-shaped wire groove 111 and the second U-shaped wire groove 112 are adapted to the first cable 3 and the second cable 4, respectively. The lower surface of the upper cover 5 has a first arc-shaped protrusion 54 and a second arc-shaped protrusion 55 at both ends, respectively, which are adapted to the first U-shaped wire groove 111 and the second U-shaped wire groove 112. The first arc-shaped protrusion 54 and the second arc-shaped protrusion 55 have a first arc-shaped surface 541 and a second arc-shaped surface 551, respectively, which are adapted to the first cable 3 and the second cable 4, respectively. The first cable 3 passes through the first U-shaped wire groove 111 and is installed in a way that fits the bottom of the first U-shaped wire groove 111. The first arc-shaped protrusion 54 is inserted into the first U-shaped wire groove 111 and presses against the upper end of the first cable 3. The first arc-shaped surface 541 of the protrusion 54 is adapted to the upper end of the first cable 3, and the colloid 6 is also filled in the first gap between the first cable 3 and the first U-shaped groove 111, and the second gap between the first arc-shaped protrusion 54 and the first cable 3; the second cable 4 is inserted into the second U-shaped groove 112, and the lower end of the second cable 4 is adapted to the bottom of the second U-shaped groove 112. The second arc-shaped protrusion 55 is inserted into the second U-shaped groove 112 and presses on the upper end of the second cable 4. The second arc-shaped surface 551 of the second arc-shaped protrusion 55 is adapted to the upper end of the second cable 4, thereby ensuring that the first cable 3 and the second cable 4 are stably installed at both ends of the bottom shell 1 and the top cover 5, respectively. The colloid 6 is also filled in the third gap between the second cable 4 and the second U-shaped groove 112, and the fourth gap between the second arc-shaped protrusion 55 and the second cable 4.

[0036] Furthermore, the mounting cavity 11 has a first extension seat 101 and a second extension seat 102 formed at both ends, extending from the outside inward and respectively used to support and position the first cable 3 and the second cable 4. The first U-shaped cable groove 111 and the second U-shaped cable groove 112 extend and penetrate the inner surfaces of the first extension seat 101 and the second extension seat 102. In other words, the purpose of adding the first extension seat 101 and the second extension seat 102 in this invention is to increase the length of the first U-shaped cable groove 111 and the second U-shaped cable groove 112, thereby increasing the contact area between the first U-shaped cable groove 111 and the second U-shaped cable groove 112 and the first cable 3 and the second cable 4, respectively, thereby enhancing the support and positioning effect.

[0037] The other end of the first cable 3 connected to the PCB board 2 is at least divided into a first wire 31 and a second wire 32. The first wire 31 and the second wire 32 are respectively connected to a first plug 33 and a second plug 34 with different structures to meet different usage requirements. The first plug 33 is provided with a first elastic latch 331 for locking with the first socket. The upper end of the second plug 34 is formed with a first buckle 341 for locking with the second socket, and both sides of the second plug 34 are formed with first latches 342 for locking with the second socket.

[0038] The other end of the second cable 4, which connects to the PCB board 2, is at least divided into a third wire 41 and a fourth wire 42. These wires are respectively connected to a third plug 43 and a fourth plug 44 with different structures to meet different usage requirements. A first elastic pressure plate 431 is formed on the third plug 43. When the third plug 43 is inserted into the third socket, the first elastic pressure plate 431 elastically presses against the upper surface of the third socket. A second buckle 441 is formed on the upper end of the fourth plug 44 for locking with the fourth socket.

[0039] In summary, the PCB board 2 is embedded in the mounting cavity 11 of the bottom shell 1. The two sides of the PCB board 2 contact the inner walls of the mounting cavity 11, and the positioning grooves 21 and positioning protrusions 12 on both sides of the PCB board 2 are embedded and positioned to ensure that the PCB board 2 will not move left or right after being installed in the mounting cavity 11 of the bottom shell 1, thus ensuring the stability of the assembly structure, facilitating subsequent glue application, and improving product quality. The second cable 4 is connected to the first cable 3 through the PCB board 2 and is separated by the PCB board 2, preventing the gaps in the first cable 3 and the second cable 4 from forming a complete pressure chamber. Therefore, when siphoning occurs at this part, it is disconnected, and moisture will not continue to enter, thus achieving the purpose of anti-siphoning. Furthermore, both the first cable 3 and the second cable 4 are fixed and connected to the PCB board 2 by welding. Compared with using conductive clips, this method is more convenient, more efficient, and provides a stable welding structure with reliable conductivity. This utility model uses a potting method to form a colloid in the mounting groove, and the colloid completely covers the outside of the PCB board 2 and the outer periphery of the ends of the first cable 3 and the second cable 4. In particular, it covers the welding parts of the first cable 3 and the second cable 4 to the PCB board 2, which not only enhances the stability of the assembly structure, but also has ideal impact resistance and waterproof performance, thus improving product quality.

[0040] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. A vehicle control waterproof and anti-siphon wiring harness, characterized in that: It includes: The bottom shell (1) has an internal mounting cavity (11), and the inner walls on both sides of the mounting cavity (11) are formed with positioning protrusions (12); PCB board (2) is embedded in the mounting cavity (11) of the bottom shell (1), and the two sides of PCB board (2) are in contact with the inner walls of the two sides of the mounting cavity (11), and the positioning grooves (21) on both sides of the PCB board (2) are embedded and positioned with the positioning protrusions (12). The first cable (3) has one end inserted into the mounting cavity (11) of the bottom shell (1) and is soldered and fixed to the PCB board (2) for conduction. The second cable (4) has one end inserted into the mounting cavity (11) of the bottom shell (1) and is soldered and fixed to the PCB board (2) for conduction. The second cable (4) and the first cable (3) are connected through the PCB board (2) and separated by the PCB board (2). The top cover (5) is fixed to the upper end of the bottom shell (1) and presses against the upper ends of the first cable (3) and the second cable (4) to press the first cable (3) and the second cable (4) tightly; The colloid (6) is formed by injecting sealant into the mounting cavity (11) and curing it. The colloid (6) completely covers the outside of the PCB board (2) and the outer periphery of the ends of the first cable (3) and the second cable (4), and fills the gap between the top cover (5) and the bottom shell (1).

2. The vehicle control waterproof and anti-siphon wiring harness according to claim 1, characterized in that: The bottom shell (1) has an upwardly protruding support platform (13) integrally formed at the bottom of the mounting cavity (11), and an upwardly protruding positioning post (14) is also integrally formed on the support platform (13); the PCB board (2) is provided with a positioning hole (22) for the positioning post (14), the PCB board (2) is sleeved on the outside of the positioning post (14) through the positioning hole (22), and the lower end face of the PCB board (2) also abuts against the upper end face of the support platform (13) to be supported by the support platform (13), so that a gap is formed between the lower end face of the PCB board (2) and the bottom of the mounting cavity (11) to be suspended in the mounting cavity (11), and the colloid (6) is also filled in the gap to wrap the outside of the PCB board (2).

3. The vehicle control waterproof and anti-siphon wiring harness according to claim 2, characterized in that: The lower end face of the upper cover (5) is formed with a positioning platform (51) that protrudes downward and is adapted to the positioning post (14). The positioning platform (51) abuts against the positioning post (14) and presses against the upper surface of the PCB board (2).

4. The vehicle control waterproof and anti-siphon wiring harness according to any one of claims 1-3, characterized in that: The upper periphery of the bottom shell (1) is provided with multiple limiting grooves (15); the lower end face of the top cover (5) is formed with multiple fixing posts (52) that are adapted to the limiting grooves (15). The fixing posts (52) are embedded and fixed in the limiting grooves (15), so that the top cover (5) is positioned at the upper end of the bottom shell (1), and the top cover (5) and the bottom shell (1) are also fixed together by ultrasonic melting.

5. The vehicle control waterproof and anti-siphon wiring harness according to any one of claims 1-3, characterized in that: The upper cover (5) is provided with a through-mount cavity (11) and an injection hole (53) for injecting sealant, wherein the sealant is epoxy resin sealant.

6. The vehicle control waterproof and anti-siphon wiring harness according to claim 5, characterized in that: The mounting cavity (11) is provided with a first U-shaped wire groove (111) and a second U-shaped wire groove (112) at both ends; the lower surface of the upper cover (5) is provided with a first arc-shaped protrusion (54) and a second arc-shaped protrusion (55) corresponding to the first U-shaped wire groove (111) and the second U-shaped wire groove (112) at both ends; the first cable (3) passes through the first U-shaped wire groove (111), the first arc-shaped protrusion (54) presses on the upper end of the first cable (3), and the colloid (6) is also filled in. The first gap between the first cable (3) and the first U-shaped groove (111), the second gap between the first arc-shaped protrusion (54) and the first cable (3); the second cable (4) is inserted into the second U-shaped groove (112), the second arc-shaped protrusion (55) presses on the upper end of the second cable (4), and the colloid (6) also fills the third gap between the second cable (4) and the second U-shaped groove (112), and the fourth gap between the second arc-shaped protrusion (55) and the second cable (4).

7. The vehicle control waterproof and anti-siphon wiring harness according to any one of claims 1-3, characterized in that: The other end of the first cable (3) connected to the PCB board (2) is divided into a first wire (31) and a second wire (32), and the first wire (31) and the second wire (32) are respectively connected to a first plug (33) and a second plug (34) with different structures.

8. The vehicle control waterproof and anti-siphon wiring harness according to claim 7, characterized in that: The other end of the second cable (4) connected to the PCB board (2) is divided into at least a third wire (41) and a fourth wire (42), which are respectively connected to a third plug (43) and a fourth plug (44) with different structures.

9. The vehicle control waterproof and anti-siphon wiring harness according to claim 6, characterized in that: The bottom shapes of the first U-shaped groove (111) and the second U-shaped groove (112) are adapted to the first cable (3) and the second cable (4), respectively; the first arc-shaped protrusion (54) and the second arc-shaped protrusion (55) have a first arc-shaped surface (541) and a second arc-shaped surface (551) respectively adapted to the first cable (3) and the second cable (4).

10. The vehicle control waterproof and anti-siphon wiring harness according to claim 6, characterized in that: The mounting cavity (11) has a first extension seat (101) and a second extension seat (102) formed at both ends, extending from the outside to the inside and used to support and position the first cable (3) and the second cable (4), respectively. The first U-shaped wire groove (111) and the second U-shaped wire groove (112) extend through the inner side of the first extension seat (101) and the second extension seat (102), respectively.

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