Anti-stumbling noon break seat with optimized gravity center

Abstract

The utility model provides an anti-stumbling noon break seat with an optimized gravity center, which relates to the field of desks and chairs and comprises a support, a base and a backrest. The support comprises a first transverse rod, a second transverse rod, a first supporting rod, a second supporting rod and a supporting frame body. The first cross rod and the second cross rod extend in the horizontal direction and are parallel to each other; the upper end of the first supporting rod and the upper end of the second supporting rod incline forwards at the angle of 75 degrees. The lower ends of the first support rod and the second support rod are respectively fixed at the 1 / 4 positions behind the first cross rod and the second cross rod; the upper ends of the first supporting rod and the second supporting rod are fixed to the lower side of the supporting frame. According to the anti-stumbling noon break seat with the optimized gravity center, the problem that in the prior art, students are easily stumbled and injured by an overlong horizontal supporting cross rod is solved, and the risk that the students are stumbled by the noon break seat can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of school desks and chairs, specifically to a non-tripping lunch break chair with optimized center of gravity. Background Technology

[0002] In the field of educational facilities, desks and chairs are essential tools for students' daily learning, and their design rationality and functionality have a significant impact on students' learning experience and physical health. With the development of educational concepts and the increasing attention to students' physical and mental health, the functional requirements for desks and chairs are no longer limited to meeting basic learning needs, but also need to adapt to students' comfort and health needs in scenarios such as lunch breaks.

[0003] Traditional school desks and chairs typically have fixed backrest angles that cannot be adjusted to suit students' needs, forcing them to slouch over their desks during lunch breaks. Prolonged use of this posture can have numerous adverse effects on students' health, such as compressing the arms and hindering blood circulation, leading to numbness and soreness; it also puts abnormal bending pressure on the cervical and spinal spine, which can accumulate over time and cause postural problems, affecting students' normal physical development.

[0004] To address the shortcomings of traditional school desks and chairs in terms of lunch break functionality, various improved designs have emerged in the market, including a lunch break desk and chair disclosed in Chinese patent application number 202221369145.5, which is cited in this patent. This lunch break desk and chair improves students' lunch break conditions to a certain extent. By installing a telescopic rod connecting a support plate under the desk and chair, and coordinating with the rotating backrest, it allows students to rest in a near-lying position during their lunch break.

[0005] However, to ensure stability when lying down, the existing desks and chairs designed for lunch breaks typically have a longer horizontal stabilizing crossbar (i.e., the laterally extending legs that rest against the ground) in their support structure than those of ordinary chairs.

[0006] The reasons for the length of the horizontal stabilizing bar are as follows: Figure 1 As shown, Figure 1 This is a side view of the relationship between the standard desk and chair support rod 01 and the horizontal stabilizing crossbar 02; lunch break style desks and chairs, such as... Figure 2 As shown, the lunch break style desk and chair is an improvement over the regular desk and chair in that its backrest 03 is adjustable. By changing the angle of the backrest 03 relative to the seat cushion 04, students can easily lie down for a lunch break. However, in this position, the student and the overall center of gravity of the desk and chair are shifted backward, with the center of gravity point 05. To ensure the stability of the lunch break style desk and chair, the length of the horizontal stabilizing bar 02 is usually extended backward, resulting in an extension 06. After extending the horizontal stabilizing bar, during normal use, the extension 06 will extend beyond the vertical projection of the seat cushion 04. Figure 3 .

[0007] Increasing the length of the horizontal stabilizing bar will take up more space when desks and chairs are stacked and stored, which is not conducive to the efficient use of classroom space. Furthermore, because the horizontal stabilizing bar is longer than the normal length range of ordinary desks and chairs, students are likely to accidentally kick or trip over the part of the horizontal stabilizing bar that exceeds the normal length when they move around in the classroom, which may lead to falls and injuries. Utility Model Content

[0008] To address the aforementioned technical problems, this utility model provides an anti-tripping nap chair with an optimized center of gravity, which can reduce the risk of students tripping over the nap chair.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] This utility model provides a center-of-gravity optimized anti-tripping nap chair, comprising a frame, a base, and a backrest. The frame includes a first crossbar, a second crossbar, a first support rod, a second support rod, and a support frame. The first and second crossbars extend horizontally and are parallel to each other. Perpendicular to the first crossbar, the two ends of the first and second crossbars are aligned. The first support rod is inclined relative to the horizontal plane. The upper end of the first support rod is inclined forward at a 75° angle. The lower end of the first support rod is fixed to the first crossbar. The lower end of the first support rod is fixed at the rear 1 / 4 of the first crossbar. The upper end of the first support rod is fixed to the support frame. The second support rod is inclined relative to the horizontal plane; the upper end of the second support rod is inclined forward at a 75° angle; the lower end of the second support rod is fixed to the second crossbar; the lower end of the second support rod is fixed at the rear 1 / 4 of the second crossbar; the upper end of the second support rod is fixed to the lower side of the support frame; the base is fixed to the upper side of the support frame; the base has a seat surface for supporting a human body; the backrest is rotatably fixed to the rear side of the support frame; the backrest has a backrest for the human back to lean against; the backrest can change its orientation as the backrest rotates relative to the support frame; in normal use, the backrest can face the direction of the seat surface.

[0011] The optimized center of gravity anti-tripping nap chair provided by this utility model preferably further includes a telescopic rod and a support plate assembly for supporting the legs; the telescopic rod has a fixed part and a telescopic part; the fixed part is fixed to the support frame; the telescopic part is telescopically fixed to the fixed part; the telescopic direction of the telescopic part is parallel to the extension direction of the first crossbar; the support plate assembly is fixed to the telescopic part.

[0012] The optimized center of gravity anti-tripping nap chair provided by this utility model preferably includes the following: the first support rod includes a first fixed tube and a first movable rod; the first fixed tube is fixed to the first crossbar; the first movable rod is slidably fixed inside the first fixed tube; the extension direction of the first movable rod is consistent with the axis direction of the first fixed tube; the upper part of the first movable rod is fixed to the support frame; the second support rod includes a second fixed tube and a second movable rod; the second fixed tube is fixed to the second crossbar; the second movable rod is slidably fixed inside the second fixed tube; the extension direction of the second movable rod is consistent with the axis direction of the second fixed tube; the upper part of the second movable rod is fixed to the support frame.

[0013] The optimized center of gravity anti-tripping nap chair provided by this utility model preferably includes a synchronizing rod in the bracket; the synchronizing rod extends horizontally; the two ends of the synchronizing rod are respectively connected to the first movable rod and the second movable rod; the extension direction of the synchronizing rod is perpendicular to the extension direction of the first crossbar.

[0014] The optimized center of gravity anti-tripping nap chair provided by this utility model preferably includes a limiting and stabilizing rod in the bracket; the limiting and stabilizing rod extends horizontally; the two ends of the limiting and stabilizing rod are respectively connected to the first crossbar and the second crossbar; the extension direction of the limiting and stabilizing rod is perpendicular to the extension direction of the first crossbar.

[0015] This utility model provides a center-of-gravity optimized, anti-tripping lunch break chair, relating to the field of desks and chairs, including a frame, a base, and a backrest; the frame includes a first crossbar, a second crossbar, a first support rod, a second support rod, and a support frame; the first and second crossbars extend horizontally; the extension directions of the first and second crossbars are parallel to each other; perpendicular to the horizontal direction of the first crossbar, the two ends of the first and second crossbars are aligned; the first support rod is inclined relative to the horizontal plane; the upper end of the first support rod is inclined forward at a 75° angle; the lower end of the first support rod is fixed to the first crossbar; the lower end of the first support rod is fixed at the rear 1 / 4 of the first crossbar; the upper end of the first support rod is fixed... The second support rod is fixed to the lower side of the support frame; the second support rod is inclined relative to the horizontal plane; the upper end of the second support rod is inclined forward at an angle of 75°; the lower end of the second support rod is fixed to the second crossbar; the lower end of the second support rod is fixed at the rear 1 / 4 of the second crossbar; the upper end of the second support rod is fixed to the lower side of the support frame; the base is fixed to the upper side of the support frame; the base has a seat surface for supporting a human body; the backrest is rotatably fixed to the rear side of the support frame; the backrest has a backrest for the human back to lean against; the backrest can change its orientation as the backrest rotates relative to the support frame; in normal use, the backrest can face the direction of the seat surface. This utility model provides a center-of-gravity optimized anti-tripping nap chair, solving the problem in the prior art where students are easily tripped and injured by excessively long horizontal support crossbars, and reducing the risk of students tripping over nap chairs. Attached Figure Description

[0016] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0017] Figure 1 This is a schematic diagram of a conventional school desk and chair structure provided in the background technology of this utility model.

[0018] Figure 2 This is a schematic diagram of a conventional lunch break desk and chair structure for daily study, provided by the background technology of this utility model.

[0019] Figure 3 This is a schematic diagram of a conventional lunch break desk and chair setup for a lunch break scenario, provided by the background technology of this utility model.

[0020] Figure 4 This is a schematic diagram of the overall structure of the anti-tripping lunch break chair with optimized center of gravity provided in Embodiment 1 of this utility model for daily study scenarios.

[0021] Figure 5 This is a schematic diagram of the overall structure of the anti-tripping lunch break chair with optimized center of gravity provided in Embodiment 1 of this utility model during the lunch break period.

[0022] Figure 6 This is a partial structural diagram of the first support rod of the anti-tripping nap chair with optimized center of gravity provided in Embodiment 1 of this utility model.

[0023] Figure 7 This is a partial structural diagram of the second support rod of the anti-tripping nap chair with optimized center of gravity provided in Embodiment 1 of this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without inventive effort are within the protection scope of the present utility model.

[0025] Example 1: The anti-tripping nap chair with optimized center of gravity provided in Example 1 of this utility model, such as... Figures 4 to 7As shown, the support includes a bracket 1, a base 2, and a backrest 3. The bracket 1 includes a first crossbar 11, a second crossbar 12, a first support rod 13, a second support rod 14, and a support frame 15. The first crossbar 11 and the second crossbar 12 extend horizontally. The extension directions of the first crossbar 11 and the second crossbar 12 are parallel to each other. In the horizontal direction perpendicular to the first crossbar 11, the front ends and rear ends of the first crossbar 11 and the second crossbar 12 are aligned respectively. The first support rod 13 is inclined relative to the horizontal plane. The upper end of the first support rod 13 is inclined forward at an angle of 75°. The lower end of the first support rod 13 is fixed to the first crossbar 11. The lower end of the first support rod 13 is fixed at the rear 1 / 4 of the first crossbar 11. The upper end of the first support rod 13 is fixed to the support frame. The second support rod 14 is inclined relative to the horizontal plane; the upper end of the second support rod 14 is inclined forward at an angle of 75°; the lower end of the second support rod 14 is fixed to the second crossbar 12; the lower end of the second support rod 14 is fixed at the rear 1 / 4 of the second crossbar 12; the upper end of the second support rod 14 is fixed to the lower side of the support frame 15; the base 2 is fixed to the upper side of the support frame 15; the base 2 has a seat surface 21 for supporting a human body; the backrest 3 is rotatably fixed to the rear side of the support frame 15; the backrest 3 has a backrest 31 for the human back to lean against; the backrest 31 can change its orientation as the backrest 3 rotates relative to the support frame 15; in normal use, the backrest 3 can face the direction of the seat surface 21.

[0026] The optimized center of gravity anti-tripping nap chair of Embodiment 1 of this utility model is suitable for both daily study and lunch break scenarios. In the daily study scenario, the backrest 31 of the backrest 3 remains vertical; during the lunch break scenario, the backrest 3 rotates and is fixed relative to the support 1, and the backrest 31 tilts backward, forming an ergonomic obtuse angle with the support 1, providing comfortable support for the student's back and facilitating a nap in a lying position.

[0027] Compared to existing technologies, in existing technologies, the support rod extends vertically and is located at the center of the lower horizontal bar. When the nap chair is switched to a reclining position and used by the student, the center of gravity formed by the student and the nap chair is behind the support rod, making the chair prone to tilting backward. This embodiment makes an improvement: Firstly, the first support rod 13 is fixed at the rear 1 / 4 of the first horizontal bar 11, and the second support rod 14 is fixed at the rear 1 / 4 of the second horizontal bar 12. In this way, when the student is lying on the nap chair, the center of gravity of the student and the main body of the chair (excluding the first and second horizontal bars) is located near the area above the connection between the first horizontal bar 11 and the first support rod 13, and the connection between the second horizontal bar 12 and the second support rod 14. This reduces the center of gravity (during the nap period, when the student is using the chair) from the center of gravity (provided by the first horizontal bar 11 for the student and the main body of the chair). The horizontal distance between the support points reduces the lever arm and improves the stability of the nap chair. On the other hand, this embodiment uses the first support rod 13 and the second support rod 14, which are set at an angle. In daily study scenarios, the center of gravity of the entire structure consisting of the support frame 15, the base 2, the backrest 3, and the student is located near the midpoint between the midpoint of the first crossbar 11 and the midpoint of the second crossbar 12. If the connection point between the first support rod 13, the second support rod 14, and the support frame 15 is moved abruptly, the center of gravity in daily study scenarios will be in front of the connection point, and the seat may tilt forward and fall. Therefore, this embodiment keeps the position of the force application point on the support frame 15 unchanged, and by adjusting the connection position between the first support rod 13, the second support rod 14, and the first crossbar 11 and the second crossbar 12, it ensures that the nap chair can maintain a stable balance in both usage scenarios.

[0028] First, since the first support rod 13 and the second support rod 14 are fixed at the rear 1 / 4 of the first crossbar 11 and the second crossbar 12, this design ensures that when the student is lying down, the center of gravity of the student and the main body of the seat (excluding the first and second crossbars) is located near the connection between the first crossbar 11 and the first support rod 13, and the connection between the second crossbar 12 and the second support rod 14. At this time, the horizontal distance between the center of gravity and the support point (i.e., the contact area between the first and second crossbars and the ground) is small. According to the lever principle, a smaller lever arm will generate a smaller torque that causes the seat to tip over under the same gravity. Therefore, in this case, the seat can maintain balance by relying only on the existing length of the first crossbar 11 and the second crossbar 12, without the need to extend the crossbars to extend the stabilizing lever arm to ensure stability. That is, this embodiment reduces the lever arm of the applied pressure, so that a small stabilizing lever arm (in this embodiment, the stabilizing lever arm is the length from the connection point between the first support rod 13 and the first crossbar 11 to both ends of the first crossbar 11) can be used to maintain balance (the prior art extends the stabilizing lever arm). Secondly, in this embodiment, both the first support rod 13 and the second support rod 14 are tilted forward at 75°. This tilting design changes the way force is transmitted: in a lying position, the weight of the person is transmitted to the tilted support rod through the seat. Gravity is decomposed into components along the direction of the support rod and perpendicular to the direction of the support rod. The component along the direction of the support rod puts pressure on the support rod, while the component perpendicular to the direction of the support rod causes the support rod to tend to tilt to the side. However, due to the tilt of the support rod, the ground generates a reverse supporting force on the support rod. This supporting force can also be decomposed into horizontal (forward) and vertical (upward) components. The horizontal component can balance the force that causes the support rod to tilt backward due to the decomposition of gravity at the rear, enhancing the stability of the seat in the front-to-back horizontal direction. This structure itself has good anti-tipping ability. Even if the first crossbar 11 and the second crossbar 12 are not extended, they can effectively resist the instability caused by changes in human posture. Therefore, the length of the first crossbar 11 and the second crossbar 12 in this embodiment is shorter than the horizontal support crossbar of a conventional nap chair, reducing the risk of students tripping.

[0029] The optimized center of gravity anti-tripping nap chair provided in Embodiment 1 of this utility model solves the problem in the prior art that students are easily tripped and injured by excessively long horizontal support bars, and can reduce the risk of students tripping over the nap chair.

[0030] As a preferred embodiment, this model further includes a telescopic rod 4 and a support plate assembly 5 for supporting the legs. The telescopic rod 4 has a fixed part 41 and a telescopic part 42. The fixed part 41 is fixed to the support frame 15. The telescopic part 42 is telescopically fixed to the fixed part 41. The telescopic direction of the telescopic part 42 is parallel to the extension direction of the first crossbar 11. The support plate assembly 5 is fixed to the telescopic part 42. The fixing method of the support plate assembly 5 and the telescopic part 42 adopts existing technology and will not be described in detail here. The telescopic rod 4 and the leg support plate assembly 5 are designed to provide a platform for students to support their feet. In daily study scenarios, the telescopic part 42 retracts relative to the fixed part 41 and is positioned vertically below the support frame 15. The leg support plate assembly 5 moves with the telescopic part 42 to below the support frame 15, i.e., below the base 2, to avoid affecting the student's normal sitting posture. In the lunch break scenario, the telescopic part 42 extends relative to the fixed part 41 and moves to the front of the support frame 15. The leg support plate assembly 5 moves with the telescopic part 42 to the front of the support frame 15, allowing students to place their feet on the leg support plate assembly 5 and assume a lying position.

[0031] To meet the needs of students of different heights, in this embodiment, the first support rod 13 includes a first fixed tube 131 and a first movable rod 132; the first fixed tube 131 is fixed to the first crossbar 11; the first movable rod 132 is slidably fixed inside the first fixed tube 131; the extension direction of the first movable rod 132 is consistent with the tube axis direction of the first fixed tube 131; the upper part of the first movable rod 132 is fixed to the support frame 15; the second support rod 14 includes a second fixed tube 141 and a second movable rod 142; the second fixed tube 141 is fixed to the second crossbar 12; the second movable rod 142 is slidably fixed inside the second fixed tube 141; the extension direction of the second movable rod 142 is consistent with the tube axis direction of the second fixed tube 141; the upper part of the second movable rod 142 is fixed to the support frame 15. The sliding of the first movable rod 132 relative to the first fixed tube 131 can change the length between the upper end of the first movable rod 132 and the lower end of the first fixed rod 131, thereby adjusting the length of the first support rod 13 (the specific connection method and position adjustment method of the first movable rod 132 and the first fixed rod 131 are existing technologies and will not be elaborated here). The change in the length of the first support rod 13 changes the distance between the upper and lower ends of the first support rod 13, thereby adjusting the distance between the support frame 15 and the first crossbar 11, thereby realizing the height adjustment of the support frame 15, and thus realizing the height adjustment of the base 2. When the first movable rod 132 slides relative to the first fixed tube 131, it is necessary to simultaneously control the sliding of the second movable rod 142 relative to the second fixed tube 141 to ensure that the base 2, which has the support frame 15 fixed on the support frame 15, is in a balanced posture.

[0032] As a preferred embodiment, the bracket 1 further includes a synchronizing rod 16; the synchronizing rod 16 extends horizontally; its two ends are respectively connected to a first movable rod 132 and a second movable rod 142; the extension direction of the synchronizing rod 16 is perpendicular to the extension direction of the first crossbar 11. The synchronizing rod 16 facilitates the length adjustment and balance of the first support rod 13 and the second support rod 14.

[0033] As a preferred embodiment, the bracket 1 further includes a limiting and stabilizing rod 17; the limiting and stabilizing rod 17 extends horizontally; its two ends are respectively connected to the first crossbar 11 and the second crossbar 12; the extending direction of the limiting and stabilizing rod 17 is perpendicular to the extending direction of the first crossbar 11. The limiting and stabilizing rod 17 can ensure the stability of the position between the first crossbar 11 and the second crossbar 12.

[0034] In summary, this utility model provides a center-of-gravity optimized anti-tripping nap chair, relating to the field of desks and chairs, including a frame, a base, and a backrest; the frame includes a first crossbar, a second crossbar, a first support rod, a second support rod, and a support frame; the first and second crossbars extend horizontally; the extension directions of the first and second crossbars are parallel to each other; perpendicular to the horizontal direction of the first crossbar, the two ends of the first and second crossbars are aligned; the first support rod is inclined relative to the horizontal plane; the upper end of the first support rod is inclined forward at a 75° angle; the lower end of the first support rod is fixed to the first crossbar; the lower end of the first support rod is fixed at the rear 1 / 4 of the first crossbar; the first support rod... The upper end is fixed to the lower side of the support frame; the second support rod is inclined relative to the horizontal plane; the upper end of the second support rod is inclined forward at a 75° angle; the lower end of the second support rod is fixed to the second crossbar; the lower end of the second support rod is fixed at the rear 1 / 4 of the second crossbar; the upper end of the second support rod is fixed to the lower side of the support frame; the base is fixed to the upper side of the support frame; the base has a seat surface for supporting a human body; the backrest is rotatably fixed to the rear side of the support frame; the backrest has a backrest for the human back to lean against; the backrest can change its orientation as the backrest rotates relative to the support frame; in normal use, the backrest can face the direction of the seat surface. This utility model provides a center-of-gravity optimized anti-tripping nap chair, solving the problem in the prior art where students are easily tripped and injured by excessively long horizontal support bars, and reducing the risk of students tripping over nap chairs.

[0035] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A center of gravity optimized anti-slip lunch break chair, characterized by, The support frame, the base and the backrest; The support frame comprises a first horizontal rod, a second horizontal rod, a first support rod, a second support rod and a support frame body; The first horizontal rod and the second horizontal rod extend horizontally and in parallel to each other, and the two ends of the first horizontal rod and the second horizontal rod are aligned in the horizontal direction of the first horizontal rod; The first support rod is inclined relative to the horizontal plane, the upper end of the first support rod is inclined forward at an angle of 75°, the lower end of the first support rod is fixed on the first horizontal rod, the lower end of the first support rod is fixed on the rear 1 / 4 of the first horizontal rod, and the upper end of the first support rod is fixed on the lower side of the support frame body; The second support rod is inclined relative to the horizontal plane, the upper end of the second support rod is inclined forward at an angle of 75°, the lower end of the second support rod is fixed on the second horizontal rod, the lower end of the second support rod is fixed on the rear 1 / 4 of the second horizontal rod, and the upper end of the second support rod is fixed on the lower side of the support frame body; The base is fixed on the upper side of the support frame body, and the base has a seat surface for bearing the human body; The backrest is rotatably fixed on the rear side of the support frame body, and the backrest has a backrest surface for the human back to lean against; The orientation of the backrest surface can be changed with the rotation of the backrest relative to the support frame body; In the normal use state, the backrest surface can be oriented toward the seat surface.

2. The anti-trip lunch chair with optimized gravity center according to claim 1, further comprising a telescopic rod and a supporting plate assembly for supporting the legs; The telescopic rod has a fixed part and a telescopic part, the fixed part is fixed on the support frame body, the telescopic part is telescopically fixed on the fixed part, and the telescopic direction of the telescopic part is parallel to the extension direction of the first horizontal rod; The supporting plate assembly is fixed on the telescopic part.

3. The anti-trip lunch chair with optimized gravity center according to claim 1, wherein the first support rod comprises a first fixed tube and a first movable rod; The first fixed tube is fixed on the first horizontal rod, the first movable rod is slidably fixed in the first fixed tube, the extension direction of the first movable rod is consistent with the tube axis direction of the first fixed tube, and the upper part of the first movable rod is fixed on the support frame body; The second support rod comprises a second fixed tube and a second movable rod; The second fixed tube is fixed on the second horizontal rod, the second movable rod is slidably fixed in the second fixed tube, the extension direction of the second movable rod is consistent with the tube axis direction of the second fixed tube, and the upper part of the second movable rod is fixed on the support frame body.

4. The anti-trip lunch chair with optimized gravity center according to claim 3, wherein the support frame further comprises a synchronous rod; The synchronous rod extends horizontally; The two ends of the synchronous rod are connected with the first movable rod and the second movable rod respectively; The extension direction of the synchronous rod is perpendicular to the extension direction of the first horizontal rod.

5. The anti-trip lunch chair with optimized gravity center according to claim 1, wherein the support frame further comprises a limiting and stabilizing rod. ​ ​ ​ ​ The limiting and stabilizing rod extends horizontally; Two ends of the limiting and stabilizing rod are connected with the first horizontal rod and the second horizontal rod respectively; The extending direction of the limiting and stabilizing rod is perpendicular to the extending direction of the first horizontal rod.

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