Foldable barstool

Abstract

The utility model discloses a foldable bar chair, which relates to the technical field of foldable bar chairs, and comprises a support plate, the outer surface of the support plate is provided with a taking hole, the outer surface of the support plate is provided with a magnetic block I, the outer surface of the support plate is fixedly connected with a bulge, and the inner surface of the support plate is fixedly connected with a folding mechanism; the auxiliary plate can rotate around the outer surface of the connecting shaft, when folding is needed, the second magnetic block and the first magnetic block attract each other, the auxiliary plate and the supporting plate are combined, the seat plate rotates around the fixing shaft, the second magnetic plate and the first magnetic plate attract each other, the seat plate and the auxiliary plate are combined, and finally the whole structure becomes a vertical plane and is convenient to carry; the stability of the folding state is ensured through magnetic attraction fixing, the problem that the folded folding chair is likely to be scattered in the moving process is solved, meanwhile, the containing grooves and the protrusions at the bottom of the seat plate can play a fixing role when unfolded, and the sliding condition is prevented.

Description

Technical Field

[0001] This utility model relates to the field of folding bar stool technology, specifically to a foldable bar stool. Background Technology

[0002] Bar stools are high chairs commonly used in bars, cafes, home bars, or to accompany high tables. Although they have a simple structure, they come in a variety of designs, and their seats are usually positioned high.

[0003] Existing foldable bar stools have several drawbacks. First, the folded high stools are not fixed in place and easily fall apart during movement, greatly reducing the efficiency of moving and storing them. Second, different customers have different sitting habits, and the limited length of the stools cannot accommodate everyone. Therefore, this utility model designs a foldable bar stool to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, the technical solution adopted by this utility model is as follows: a foldable bar stool, including a support plate, a retrieval hole on the outer surface of the support plate, a magnet installed on the outer surface of the support plate, a protrusion fixedly connected to the outer surface of the support plate, and a folding mechanism fixedly connected to the inner surface of the support plate; the bottom of the support plate can be used to support the ground, providing a certain support for the folding stool during use, and the retrieval hole facilitates the user to pick up the bar stool by hand after folding.

[0005] The folding mechanism includes a connecting shaft, an auxiliary plate rotatably connected to the outer surface of the connecting shaft, a magnetic plate one mounted on the inner surface of the auxiliary plate, a magnetic block two mounted in a groove on the lower surface of the auxiliary plate, a fixed shaft fixedly connected to the inner surface of the auxiliary plate, a seat plate rotatably connected to the outer surface of the fixed shaft, a magnetic plate two mounted on the upper surface of the seat plate, a placement groove on the lower surface of the seat plate, a magnetic plate three mounted on the lower surface of the seat plate, and an extension component fixedly connected to the lower surface of the seat plate. During use, the auxiliary plate and the support plate cooperate to provide support to the ground, facilitating the user's seating on the folding chair. Magnetic plates one and two have mutual attraction, as do magnetic blocks one and two. The placement groove at the bottom of the seat plate can cooperate with a protrusion on the surface of the support plate. When the seat plate rests on the support plate, the placement groove limits the protrusion, preventing further sliding of the seat plate.

[0006] Furthermore, the inner surface of the support plate is slidably connected to the outer surface of the auxiliary plate, both ends of the connecting shaft pass through and are fixedly connected to the inner surface of the support plate, and the magnetic plate is positioned in the middle of the two placement slots.

[0007] Furthermore, the extension component includes an extension plate, on the inner surface of the bottom of the extension plate a magnetic plate four is mounted, a placement component is slidably connected to the inner surface of the extension plate, a connecting block is fixedly connected to the side of the extension plate near the placement groove, a rotating shaft is fixedly connected to the inner wall of the connecting block, and pressing blocks are sleeved and mounted on both ends of the outer surface of the rotating shaft. Magnetic plates three and four have the ability to attract each other. The cooperation of the rotating shaft and the connecting block can change the flip angle of the extension plate, allowing the extension plate to cooperate with the seat plate, thereby increasing the length of the seat and avoiding limitations.

[0008] Furthermore, an arc-shaped block is movably connected to the outer surface of the extrusion block. Pull tubes are fixedly connected to both the upper and lower surfaces of the arc-shaped block. A fixed box is slidably connected to the outer surface of the arc-shaped block, and an extrusion band is fixedly connected to the inner surface of the fixed box. The upper surface of the arc-shaped block is flat, and the lower surface is arc-shaped. During contact with the extrusion block, the arc-shaped surface allows it to slide along the inner surface of the fixed box. When the protrusion of the extrusion block rotates to a horizontal position, the upper surface of the arc-shaped block restricts the rotation of the extrusion block. The extrusion band functions similarly to a spring, possessing both elasticity and a restoring function.

[0009] Furthermore, both ends of the rotating shaft are rotatably connected to the lower surface of the seat plate, and the side of the fixing box away from the connecting block is fixedly connected to the inner surface of the extension plate.

[0010] Furthermore, the placement component includes a drawer, with a bent tube installed on the side of the drawer away from the pivot. A pressing rod is slidably connected to the inner wall of the bent tube, and a pulling rod is fixedly connected to one side of the pressing rod. A spring band is installed on the side of the pulling rod away from the pressing rod. The spring band functions similarly to a spring, possessing elasticity and a restoring function. Supported by the spring band, the two pulling rods slide to both sides and are tightly fitted against both sides of the inner surface of the extension plate.

[0011] Furthermore, the outer surface of the drawer is slidably connected to the inner surface of the extension plate, and the pull rod is installed at both ends of the spring band.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. In this utility model, the auxiliary plate can rotate around the outer surface of the connecting shaft. When folding is required, the second magnetic block and the first magnetic block attract each other, causing the auxiliary plate and the support plate to merge together. The seat plate rotates around the fixed shaft, and the second magnetic plate and the first magnetic plate attract each other, causing the seat plate and the auxiliary plate to merge together. Finally, the entire seat structure is transformed into a vertical plane shape, which is convenient to carry and reduces space occupation. At the same time, the magnetic fixation ensures the stability of the folded state and avoids the problem of the folded chair possibly falling apart during movement. The placement groove and protrusion at the bottom of the seat plate can play a fixing role when unfolded to prevent sliding.

[0014] 2. This utility model rotates the extension plate 180° around the outer surface of the pivot, so that when unfolded, it can form a seamless extension plane with the seat board, increasing the effective length of the seat. The arc-shaped block limits the position below the extrusion block, so that the extended plate after rotation can be stably attached to the outer surface of the seat board, avoiding the problem of the extended plate rotating downward under the action of gravity. Therefore, the increased length of the seat can make it more convenient for different people to use, so that the length of the stool can meet more people to a greater extent. For example, the extension plate can be used as a baby carrier or a temporary work table.

[0015] 3. When it is necessary to place items, the drawer can be pulled out from inside the extension plate. Before pulling it out, press the pull rod with both hands to disengage the squeezing rods on both sides from the inner surface of the extension plate, and then the drawer can be pulled out directly. The operation is simple. When the extension plate is flipped to the vertical surface during the reset process, the squeezing rods on both sides hold the inner surface of the extension plate in place. This prevents the drawer inside the extension plate from sliding out when the extension plate is tilted, further increasing safety and practicality. Attached Figure Description

[0016] Figure 1 This is the front view of this utility model;

[0017] Figure 2 This is a schematic diagram of the folding mechanism of this utility model;

[0018] Figure 3 This is a structural schematic diagram of the seat panel of this utility model;

[0019] Figure 4 This is a schematic diagram of the bottom structure of the seat panel of this utility model;

[0020] Figure 5 This is a cross-sectional view of the extension plate of this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the extrusion block of this utility model;

[0022] Figure 7 This is a structural schematic diagram of the placement component of this utility model.

[0023] In the diagram: 1. Support plate; 2. Retrieval hole; 3. Magnetic block one; 4. Protrusion; 5. Folding mechanism; 51. Connecting shaft; 52. Auxiliary plate; 53. Magnetic plate one; 54. Magnetic block two; 55. Fixed shaft; 56. Seat plate; 57. Magnetic plate two; 58. Placement slot; 59. Magnetic plate three; 60. Extension component; 601. Extension plate; 602. Magnetic plate four; 603. Placement component; 6031. Drawer; 6032. Bend; 6033. Extrusion rod; 6034. Pulling rod; 6035. Spring band; 604. Connecting block; 605. Rotating shaft; 606. Extrusion block; 607. Arc block; 608. Pull tube; 609. Fixed box; 610. Extrusion band. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0025] Example 1:

[0026] Please see Figure 1 - Figure 3 This utility model provides a technical solution: a foldable bar stool, including a support plate 1, a retrieval hole 2 on the outer surface of the support plate 1, a magnet 3 installed on the outer surface of the support plate 1, a protrusion 4 fixedly connected to the outer surface of the support plate 1, and a folding mechanism 5 fixedly connected to the inner surface of the support plate 1; the bottom of the support plate 1 can be used to support the ground, providing a certain support for the folding stool during use, and the retrieval hole 2 makes it easy for the user to pick up the bar stool by hand after folding;

[0027] Firstly, as Figure 1 The image shows the state of the folding chair during use. The support plate 1 and the folding mechanism 5 work together to form the whole bar stool. After the folding chair is finished, it can be fully retracted to form a flat surface. It can then be taken out through the retrieval hole 2 on the surface of the support plate 1, making it convenient for users to carry.

[0028] The folding mechanism 5 includes a connecting shaft 51, an auxiliary plate 52 rotatably connected to the outer surface of the connecting shaft 51, a magnetic plate 53 mounted on the inner surface of the auxiliary plate 52, a magnetic block 54 mounted in a groove on the lower surface of the auxiliary plate 52, a fixed shaft 55 fixedly connected to the inner surface of the auxiliary plate 52, a seat plate 56 rotatably connected to the outer surface of the fixed shaft 55, a magnetic plate 57 mounted on the upper surface of the seat plate 56, a placement groove 58 formed on the lower surface of the seat plate 56, a magnetic plate 59 mounted on the lower surface of the seat plate 56, and a fixed connection to the lower surface of the seat plate 56. Extension component 60; During the use of the folding chair, the auxiliary plate 52 and the support plate 1 cooperate to form a support for the ground, making it convenient for the user to sit on the surface of the folding chair. Magnetic plate one 53 and magnetic plate two 57 have the ability to attract each other, and magnetic block one 3 and magnetic block two 54 have the ability to attract each other. The placement groove 58 opened at the bottom of the seat plate 56 can cooperate with the protrusion 4 on the surface of the support plate 1. When the seat plate 56 is placed on the surface of the support plate 1, the placement groove 58 limits the protrusion 4 to prevent the seat plate 56 from continuing to slide.

[0029] The inner surface of the support plate 1 is slidably connected to the outer surface of the auxiliary plate 52. Both ends of the connecting shaft 51 pass through and are fixedly connected to the inner surface of the support plate 1. The magnetic plate 3 59 is set in the middle position of the two placement slots 58.

[0030] The auxiliary plate 52 can rotate around the outer surface of the connecting shaft 51, so that the opening angle between the auxiliary plate 52 and the support plate 1 becomes larger and larger. The bottom of the auxiliary plate 52 and the support plate 1 provide support for the entire folding chair. If the auxiliary plate 52 does not rotate around the outer surface of the connecting shaft 51, that is, the magnetic block 54 at the groove on the lower surface of the auxiliary plate 52 and the magnetic block 3 on the inner surface of the support plate 1 attract and stick together, so as to merge the auxiliary plate 52 and the support plate 1, making it convenient for the folding chair to be carried later, and preventing the auxiliary plate 52 and the support plate 1 from separating when they are merged.

[0031] At the same time, the seat plate 56 can also rotate around the outer surface of the fixed shaft 55, combined with Figure 1 , 2 As shown in Figure 3, Figure 3The seat plate 56 rotates counterclockwise around the outer surface of the fixed shaft 55 until the magnetic plate 2 57 on the upper surface of the seat plate 56 adheres to the magnetic plate 1 53 installed on the inner surface of the auxiliary plate 52. Through the adsorption between the magnetic plate 2 57 and the magnetic plate 1 53, the seat plate 56 and the auxiliary plate 52 are merged and adhered together. As mentioned above, the auxiliary plate 52 and the support plate 1 can also adhere to each other. Therefore, the seat plate 56, the auxiliary plate 52, and the support plate 1 are all merged together to form a vertically flat plate. It is more convenient to take it out and carry it through the access hole 2. Due to the adsorption capacity between the various magnetic blocks, the folding chair will not fall apart during the folding and carrying process.

[0032] Because the bottom of the seat plate 56 has a placement groove 58, when the seat plate 56 rotates clockwise around the outer surface of the fixed shaft 55 to a horizontal position, the protrusion 4 will insert into the interior of the placement groove 58. Through the cooperation of the two, the problem of the seat plate 56 sliding due to the possible expansion of the angle between the auxiliary plate 52 and the support plate 1 is avoided. Therefore, the presence of the protrusion 4 restricts the change of the position of the seat plate 56.

[0033] Example 2:

[0034] Please see Figure 1 - Figure 7 This utility model provides a technical solution: Based on Embodiment 1, the extension component 60 includes an extension plate 601, a magnetic plate 602 is installed on the inner surface of the bottom of the extension plate 601, a placement component 603 is slidably connected to the inner surface of the extension plate 601, a connecting block 604 is fixedly connected to the side of the extension plate 601 near the placement groove 58, a rotating shaft 605 is fixedly connected to the inner wall of the connecting block 604, and pressing blocks 606 are sleeved and installed at both ends of the outer surface of the rotating shaft 605. The magnetic plate 59 and the magnetic plate 602 have the ability to attract each other. The cooperation between the rotating shaft 605 and the connecting block 604 can change the flip angle of the extension plate 601, so that the extension plate 601 cooperates with the seat plate 56, which can increase the length of the seat and avoid limitations.

[0035] An arc-shaped block 607 is movably connected to the outer surface of the extrusion block 606. Pull tubes 608 are fixedly connected to both the upper and lower surfaces of the arc-shaped block 607. A fixed box 609 is slidably connected to the outer surface of the arc-shaped block 607, and an extrusion band 610 is fixedly connected to the inner surface of the fixed box 609. The upper surface of the arc-shaped block 607 is flat, and the lower surface is arc-shaped. During contact with the extrusion block 606, the arc-shaped surface allows it to slide along the inner surface of the fixed box 609. When the protrusion 4 of the extrusion block 606 rotates to a horizontal position, the upper surface of the arc-shaped block 607 limits the rotation of the extrusion block 606. The extrusion band 610 functions similarly to a spring, possessing both elasticity and a restoring function.

[0036] Both ends of the rotating shaft 605 are rotatably connected to the lower surface of the seat plate 56, and the side of the fixed box 609 away from the connecting block 604 is fixedly connected to the inner surface of the extension plate 601.

[0037] Rotate the extension plate 601 around the outer surface of the pivot 605, causing the upper surface of the extension plate 601 to rotate away from the bottom of the seat plate 56, until the extension plate 601 rotates 180 degrees, reaching the position shown in the image. Figure 4 and Figure 5 As shown, during the rotation of the extension plate 601, the connecting block 604, the rotating shaft 605, and the pressing block 606 will also rotate. During rotation, the pressing block 606 will first contact the lower surface of the arc-shaped block 607 and push it to slide along the inner surface of the fixed box 609. As the arc-shaped block 607 moves, it will press the internal pressing strip 610. Simultaneously, the arc-shaped block 607 will also cause the pull tube 608 to move away from the pressing block 606 until the protrusion 4 of the pressing block 606 rotates back to a horizontal position. At this point, the rotation of the extrusion block 606 stops, and both the extrusion block 606 and the extension plate 601 are in a horizontal position. After the lower surface of the extrusion block 606 disengages from the arc-shaped surface of the arc-shaped block 607, the arc-shaped block 607 will reset under the elasticity of the extrusion belt 610 and slide back to its original position. The lower part of the extrusion block 606 cannot rotate downwards due to the limitation of the arc-shaped block 607. Therefore, the reset movement of the arc-shaped block 607 can limit the angle of the extension plate 601, preventing the extension plate 601 from rotating downwards under the action of gravity. Through the cooperation of the extension plate 601 and the seat plate 56, the length of the seat can be extended to facilitate use by different people. For example, when the mother sits on the stool, the extra extended length can be used to place the baby, making the overall seat more convenient.

[0038] When the extension plate 601 needs to be reset, the user only needs to pull the pull tube 608 away from the extrusion block 606 with both hands. The pull tube 608 will also drive the arc block 607 to move, so that the upper surface of the arc block 607 is disengaged from below the protrusion 4 of the extrusion block 606. At this time, the protrusion 4 of the arc block 607 is no longer limited by the arc block 607. Under the action of gravity, the extension plate 601 drives the extrusion block 606, the connecting block 604, and the rotating shaft 605 to rotate, so that the extension plate 601 rotates to a vertical position. At this time, the protrusion 4 of the extrusion block 606 is no longer above the arc block 607, and the pull tube 608 can be released. The pull tube 608 resets again under the elasticity of the extrusion band 610. When the pull tube 608 moves a certain distance, it will poke the groove on the upper surface of the fixing box 609, which also limits the distance of movement of the pull tube 608.

[0039] At this point, rotate the extension plate 601 and the rotating shaft 605 clockwise by a certain angle until the magnetic plate 602 at the bottom of the extension plate 601 and the magnetic plate 59 on the inner wall of the bottom of the seat plate 56 are attracted together. The magnetic plate 602 is attracted by the magnetic plate 59. The magnetic plates in this device all have strong magnetic functions, but they can be separated by human intervention.

[0040] The placement component 603 includes a drawer 6031. A bent tube 6032 is installed on the side of the drawer 6031 away from the pivot 605. A pressing rod 6033 is slidably connected to the inner wall of the bent tube 6032. A pull rod 6034 is fixedly connected to one side of the pressing rod 6033. A spring band 6035 is installed on the side of the pull rod 6034 away from the pressing rod 6033. The spring band 6035 has the same function as a spring, both having elasticity and return functions. Under the support of the spring band 6035, the two pull rods 6034 slide to both sides respectively and are tightly attached to both sides of the inner surface of the extension plate 601.

[0041] The outer surface of drawer 6031 is slidably connected to the inner surface of extension plate 601, and pull rod 6034 is installed at both ends of spring band 6035.

[0042] Rotate the extension plate 601 to Figure 4 When the drawer is in the position shown, if you need to place some items, you can pull the drawer 6031 out from the inside of the extension plate 601. However, before pulling it out, you can press the pull rod 6034 with both hands to bring the pull rods 6034 on both sides of the spring band 6035 closer together. As they come closer, they will squeeze the spring band 6035. During the process of the pull rods 6034 coming closer together, they will drive the pressing rod 6033 to move, so that the end of the pressing rod 6033 away from the pull rod 6034 will disengage from the inner surface of the extension plate 601. After disengagement, you can pull the drawer 6031 out from the inside of the extension plate 601 using the pull rod 6034. You can then place some items inside the drawer 6031 for later use.

[0043] Working principle:

[0044] The auxiliary plate 52 can rotate around the outer surface of the connecting shaft 51. When folding is required, the second magnetic block 54 and the first magnetic block 3 attract each other, causing the auxiliary plate 52 and the support plate 1 to merge. The seat plate 56 rotates around the fixed shaft 55, and the second magnetic plate 57 and the first magnetic plate 53 attract each other, merging the seat plate 56 with the auxiliary plate 52. Finally, the entire structure becomes a vertical plane, which is convenient to carry. The magnetic fixation ensures the stability of the folded state and avoids the problem of the folding chair possibly falling apart during movement. At the same time, the placement groove 58 and the protrusion 4 at the bottom of the seat plate 56 can play a fixing role when unfolded to prevent sliding.

[0045] Rotating the extension plate 601 180° around the outer surface of the pivot 605 allows it to form a seamless extension plane with the seat plate 56 when unfolded, increasing the effective length of the seat. Simultaneously, the arc-shaped block 607 limits the position of the pressing block 606 below, ensuring that the rotated extension plate 601 firmly adheres to the outer surface of the seat plate 56, preventing it from rotating downwards under gravity. Therefore, increasing the seat's length facilitates use by different people, allowing the stool to accommodate more individuals. For example, the extension plate 601 can be used as a baby carrier or a temporary worktable.

[0046] When you need to place something, you can pull the drawer 6031 out from inside the extension plate 601. Before pulling it out, press the pull rod 6034 with both hands to disengage the squeezing rods 6033 on both sides from the inner surface of the extension plate 601, and then you can pull the drawer 6031 out directly. The operation is simple. When the extension plate 601 is flipped to a vertical position during the reset process, the squeezing rods 6033 on both sides will hold the inner surface of the extension plate 601 in place. That is, when the extension plate 601 is tilted, the drawer 6031 inside the extension plate 601 will not slip out from the inside, which increases safety and practicality.

[0047] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A foldable bar stool, comprising a support plate (1), characterized in that: The outer surface of the support plate (1) is provided with a retrieval hole (2), a magnetic block (3) is installed on the outer surface of the support plate (1), a protrusion (4) is fixedly connected to the outer surface of the support plate (1), and a folding mechanism (5) is fixedly connected to the inner surface of the support plate (1). The folding mechanism (5) includes a connecting shaft (51), an auxiliary plate (52) is rotatably connected to the outer surface of the connecting shaft (51), a magnetic plate (53) is installed on the inner surface of the auxiliary plate (52), a magnetic block (54) is installed in the groove on the lower surface of the auxiliary plate (52), a fixed shaft (55) is fixedly connected to the inner surface of the auxiliary plate (52), a seat plate (56) is rotatably connected to the outer surface of the fixed shaft (55), a magnetic plate (57) is installed on the upper surface of the seat plate (56), a placement groove (58) is opened on the lower surface of the seat plate (56), a magnetic plate (59) is installed on the lower surface of the seat plate (56), and an extension component (60) is fixedly connected to the lower surface of the seat plate (56).

2. A foldable bar stool according to claim 1, characterized in that: The inner surface of the support plate (1) is slidably connected to the outer surface of the auxiliary plate (52), both ends of the connecting shaft (51) are through and fixedly connected to the inner surface of the support plate (1), and the magnetic plate three (59) is set in the middle position of the two placement slots (58).

3. A foldable bar stool according to claim 1, characterized in that: The extension component (60) includes an extension plate (601), a magnetic plate four (602) is installed on the inner surface of the bottom of the extension plate (601), a placement component (603) is slidably connected to the inner surface of the extension plate (601), a connecting block (604) is fixedly connected to the side of the extension plate (601) near the placement groove (58), a rotating shaft (605) is fixedly connected to the inner wall of the connecting block (604), and a pressing block (606) is sleeved and installed at both ends of the outer surface of the rotating shaft (605).

4. A foldable bar stool according to claim 3, characterized in that: An arc-shaped block (607) is movably connected to the outer surface of the extrusion block (606). Pull tubes (608) are fixedly connected to both the upper and lower surfaces of the arc-shaped block (607). A fixed box (609) is slidably connected to the outer surface of the arc-shaped block (607). An extrusion belt (610) is fixedly connected to the inner surface of the fixed box (609).

5. A foldable bar stool according to claim 4, characterized in that: Both ends of the rotating shaft (605) are rotatably connected to the lower surface of the seat plate (56), and the side of the fixed box (609) away from the connecting block (604) is fixedly connected to the inner surface of the extension plate (601).

6. A foldable bar stool according to claim 3, characterized in that: The placement component (603) includes a drawer (6031), a bent tube (6032) is installed on the side of the drawer (6031) away from the pivot (605), a pressing rod (6033) is slidably connected to the inner wall of the bent tube (6032), a pulling rod (6034) is fixedly connected to one side of the pressing rod (6033), and a spring band (6035) is installed on the side of the pulling rod (6034) away from the pressing rod (6033).

7. A foldable bar stool according to claim 6, characterized in that: The outer surface of the drawer (6031) is slidably connected to the inner surface of the extension plate (601), and the pull rod (6034) is installed at both ends of the spring band (6035).

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