A traction frame

Abstract

The utility model discloses a kind of traction frame, including support column, the lower end of support column is provided with clamping mechanism, the upper end of support column is fixedly connected with fixed frame, the inside of fixed frame is slidably connected with first connecting rod, the end of first connecting rod is provided with first notched, the inside of first notched is rotatably connected with first pulley, the lower end of support column and the side close to first pulley are provided with traction mechanism, the side of support column is provided with second limiting mechanism, the other side of support column and the position corresponding with traction mechanism are provided with cavity, the inside of cavity is provided with first limiting mechanism. The utility model provides a kind of traction frame, through the structural cooperation design of fixed frame, first connecting rod and second limiting mechanism, when the position of patient leg traction needs to be adjusted, it can be conveniently adjusted, and then the convenience of patient leg traction in the overall device use process is improved, it is more convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of traction frame technology, and in particular to a traction frame. Background Technology

[0002] Fractures are one of the most common diseases in orthopedic clinics. The main treatment methods for fractures include conservative treatment and surgical treatment. In the early stages of treatment, patients are prone to swelling due to bleeding and other reasons, especially with lower limb fractures. Therefore, it is necessary to elevate the injured limb to reduce swelling as soon as possible.

[0003] Referring to the orthopedic traction frame with patent number CN210749713U, the patent describes the following: It includes two side mounting frames, each with a fixing component below for securing it to a hospital bed. A horizontally arranged sliding rod connects the two side mounting frames. A one-way bearing, which slides along the axial direction of the sliding rod and can rotate around it, is fitted onto the sliding rod. A drum is fixed to the outer ring of the one-way bearing, and a connecting rope is wound around the drum in the opposite direction to the rotation of the one-way bearing. A locking component is provided between the inner ring of the one-way bearing and the sliding rod to restrict the rotation of the inner ring of the one-way bearing. This invention has the following advantages and effects: The height of the traction frame can be adjusted, thereby enabling patients to achieve better rehabilitation results and improving the practicality of the orthopedic traction frame in actual use.

[0004] However, during the actual implementation process, the applicant discovered the following problems with the patent:

[0005] In practical applications, when the position of the patient's leg traction needs to be adjusted, it is inconvenient to adjust the traction position, which reduces the convenience of traction on the patient's leg during the use of the overall device, making it relatively inconvenient to use.

[0006] Therefore, a traction frame is needed to provide a new technical solution to address the aforementioned technical problems. Utility Model Content

[0007] Based on this, it is necessary to provide a traction frame to address the aforementioned technical problems. Through the structural design of the fixed frame, the first connecting rod, and the second limiting mechanism, the traction position of the patient's leg can be easily adjusted when needed, thereby improving the convenience of traction on the patient's leg during the use of the overall device and making it more convenient to use.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A traction frame used in orthopedics.

[0010] The aforementioned traction frame specifically includes a protective plate and a support column. A clamping mechanism is provided at the lower end of the support column, and a fixed frame is fixedly connected to the upper end of the support column. A first connecting rod is slidably connected inside the fixed frame. A first slot is opened at one end of the first connecting rod, and a first pulley is rotatably connected inside the first slot. A traction mechanism is provided at the lower end of the support column and near the first pulley. A second limiting mechanism is provided on one side of the support column, and a cavity is opened on the other side of the support column at a position corresponding to the traction mechanism. The first limiting mechanism is provided inside the cavity.

[0011] In a preferred embodiment of the traction frame provided by this utility model, the second limiting mechanism includes a first connecting frame. The first connecting frame is located on one side of the fixed frame. A first guide rod is provided at both ends of the first connecting frame. The end of the first guide rod near the fixed frame is fixedly connected to the fixed frame. Both ends of the first connecting frame are slidably connected to the first guide rods at both ends. A first insertion rod is fixedly connected to the middle of the side of the first connecting frame near the fixed frame. A second slot is provided on the side of the fixed frame near the first connecting frame and at a position corresponding to the first insertion rod. The second limiting mechanism is located near the first connecting frame... A plurality of first insertion slots corresponding to the second slot are provided on one side of the frame. The first insertion rod is inserted into and connected to the first insertion slot and the second slot. A first spring is provided on the outer side of the first insertion rod and at the position between the first connecting frame and the fixed frame. One end of the first spring is fixedly connected to the first connecting frame and the other end of the first spring is fixedly connected to the fixed frame. A second connecting frame is fixedly connected to the middle of the lower end of the first connecting frame. A second guide rod is provided at the lower end of the second connecting frame. The end of the second guide rod near the support column is fixedly connected to the support column. The lower end of the second connecting frame is slidably connected to the second guide rod.

[0012] In a preferred embodiment of the traction frame provided by this utility model, the clamping mechanism includes a frame body, the upper end of which is fixedly connected to the bottom of the support column. A clamping plate is provided inside the frame body, one side of which is in contact with the frame body. An anti-slip strip is fixedly connected to the upper end of the clamping plate. A screw is rotatably connected to the middle of the lower end of the clamping plate. The lower end of the screw passes through the frame body and extends to the outer side of the lower end of the frame body and is fixedly connected to a rotating handle. The screw is threadedly connected to the frame body.

[0013] In a preferred embodiment of the traction frame provided by this utility model, the first limiting mechanism includes a second insertion rod, one end of which is located inside the cavity and slidably connected to the cavity. Slider blocks are fixedly connected to both sides of the end of the second insertion rod located inside the cavity. Sliding grooves are provided on both sides of the cavity, and the sliders are slidably connected to the sliding grooves. A second spring is fixedly connected to the end of the second insertion rod located inside the cavity, and the end of the second spring away from the second insertion rod is fixedly connected to the interior of the cavity.

[0014] In a preferred embodiment of the traction frame provided by this utility model, the traction mechanism includes a winding rod and a second pulley. Connecting blocks are rotatably connected to both sides of the winding rod. One end of each connecting block near the support column is fixedly connected to the support column. A turntable is provided on the side of one of the connecting blocks away from the winding rod. A second connecting rod is fixedly connected to the middle of the turntable on the side near the connecting block. The end of the second connecting rod away from the turntable passes through the connecting block and is fixedly connected to the winding rod. The second connecting rod is rotatably connected to the connecting block. A torsion spring is provided on the outer side of the second connecting rod, located between the turntable and the connecting block. One end of the torsion spring is fixedly connected to the turntable, and the other end is fixedly connected to the connecting block. Multiple second insertion slots corresponding to second insertion rods are arranged in a circumferential array on the turntable. The second insertion rods are inserted into the second insertion slots. The second pulley is located at the upper end of the winding rod, and one end of the second pulley is fixedly connected to the support column.

[0015] In a preferred embodiment of the traction frame provided by this utility model, one end of the traction rope is fixedly connected to the outer side of the winding rod, and the other end of the traction rope passes around the second pulley and is perpendicularly downward from the position of the first pulley and fixedly connected to the connecting plate. A support seat is provided at the lower end of the connecting plate, and connecting ropes are fixedly connected to both sides of the upper end of the support seat. The upper end of the connecting rope is fixedly connected to the connecting plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The traction frame provided by this utility model, through the structural cooperation design of the fixed frame, the first connecting rod and the second limiting mechanism, allows for convenient adjustment when the position of the patient's leg traction needs to be adjusted, thereby improving the convenience of traction of the patient's leg during the use of the overall device and making it more convenient to use.

[0018] The present invention provides a traction frame that, through the structural cooperation design of the traction mechanism and the first limiting mechanism, allows for rapid adjustment of the traction height of the patient's leg when adjustment is required, thereby improving the practicality of traction for the patient's leg. Attached Figure Description

[0019] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the overall structure of a traction frame provided by this utility model;

[0021] Figure 2 A schematic diagram of the structure of the second limiting mechanism of the traction frame provided by this utility model;

[0022] Figure 3 A schematic diagram of the structure of a traction frame clamping mechanism provided by this utility model;

[0023] Figure 4 A schematic diagram of the structure of the first limiting mechanism of the traction frame provided by this utility model;

[0024] Figure 5 A schematic diagram of the structure of a traction mechanism for a traction frame provided by this utility model;

[0025] Figure 6 This utility model provides a structural schematic diagram of a second connecting rod and a torsion spring of a traction frame.

[0026] The markings in the diagram are explained as follows:

[0027] 1. Support column; 2. Clamping mechanism; 3. First limiting mechanism; 4. Traction mechanism; 5. Fixing frame; 6. First connecting rod; 7. First slot; 8. First pulley; 9. Second limiting mechanism; 10. First insertion slot; 11. First connecting frame; 12. First guide rod; 13. First insertion rod; 14. First spring; 15. Second connecting frame; 16. Second guide rod; 17. Second slot; 18. Frame body; 19. Clamping plate; 20. Anti-slip strip; 21. Screw; 22. Rotary handle; 23. Second insertion rod; 24. Slider; 25. Second spring; 26. Winding rod; 27. Connecting block; 28. Turntable; 29. ​​Second insertion slot; 30. Traction rope; 31. Second pulley; 32. Second connecting rod; 33. Connecting plate; 34. Support base; 35. Connecting rope; 36. Torsion spring. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0029] As described in the background art, in the specific application of this patent, when the position of the patient's leg traction needs to be adjusted, it is inconvenient to adjust the traction position, which reduces the convenience of traction on the patient's leg during the use of the overall device and makes it relatively inconvenient to use.

[0030] To solve this technical problem, this utility model provides a traction frame that is applied in orthopedics.

[0031] For details, please refer to Figure 1 A traction frame specifically includes a support column 1, a clamping mechanism 2 at the lower end of the support column 1, a fixed frame 5 fixedly connected to the upper end of the support column 1, a first connecting rod 6 slidably connected inside the fixed frame 5, a first slot 7 opened at one end of the first connecting rod 6, a first pulley 8 rotatably connected inside the first slot 7, a traction mechanism 4 provided at the lower end of the support column 1 and near the first pulley 8, a second limiting mechanism 9 provided on one side of the support column 1, and a cavity opened on the other side of the support column 1 at a position corresponding to the traction mechanism 4, with a first limiting mechanism 3 provided inside the cavity.

[0032] The traction frame provided by this utility model, through the structural cooperation design of the fixed frame 5, the first connecting rod 6 and the second limiting mechanism 9, allows for convenient adjustment when the position of the patient's leg traction needs to be adjusted, thereby improving the convenience of traction of the patient's leg during the use of the overall device and making it more convenient to use.

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0034] Example 1:

[0035] Please refer to Figure 1 - Figure 3A traction frame includes a support column 1, a clamping mechanism 2 at the lower end of the support column 1, a fixed frame 5 fixedly connected to the upper end of the support column 1, a first connecting rod 6 slidably connected inside the fixed frame 5, a first slot 7 at one end of the first connecting rod 6, a first pulley 8 rotatably connected inside the first slot 7, a traction mechanism 4 at the lower end of the support column 1 and near the first pulley 8, a second limiting mechanism 9 at one side of the support column 1, and a cavity at the other side of the support column 1 and corresponding to the traction mechanism 4, with a first limiting mechanism 3 inside the cavity.

[0036] Through the above structural design, it can be seen that the clamping mechanism 2 can fix the overall structure to both sides of the bed, the support column 1 can support the first connecting rod 6, the second limiting mechanism 9 can limit the adjustment of the first connecting rod 6, the traction mechanism 4 can traction the patient's legs, and the first limiting mechanism 3 can limit the traction height adjustment of the traction mechanism 4 on the patient's legs.

[0037] Specifically, the second limiting mechanism 9 includes a first connecting frame 11, which is located on one side of the fixed frame 5. Both ends of the first connecting frame 11 are provided with first guide rods 12. The end of the first guide rod 12 closest to the fixed frame 5 is fixedly connected to the fixed frame 5. Both ends of the first connecting frame 11 are slidably connected to the first guide rods 12 at both ends. A first insertion rod 13 is fixedly connected to the middle of the side of the first connecting frame 11 closest to the fixed frame 5. A second slot 17 is opened on the side of the fixed frame 5 closest to the first connecting frame 11, corresponding to the position of the first insertion rod 13. The second limiting mechanism 9 has multiple slots 17 on the side of the first connecting frame 11 closest to the second slot 17. The first insertion slot 10 and the first insertion rod 13 are connected to the first insertion slot 10 and the second slot 17 respectively. A first spring 14 is provided on the outside of the first insertion rod 13 and at the position between the first connecting frame 11 and the fixed frame 5. One end of the first spring 14 is fixedly connected to the first connecting frame 11 and the other end of the first spring 14 is fixedly connected to the fixed frame 5. A second connecting frame 15 is fixedly connected to the middle of the lower end of the first connecting frame 11. A second guide rod 16 is provided at the lower end of the second connecting frame 15. The end of the second guide rod 16 near the support column 1 is fixedly connected to the support column 1, and the lower end of the second connecting frame 15 is slidably connected to the second guide rod 16.

[0038] Through the above structural design, it can be seen that when it is necessary to adjust the traction position of the traction mechanism 4, the second connecting frame 15 can be pulled away from the support column 1, thereby sliding the second connecting frame 15 on the second guide rod 16 away from the support column 1. At the same time, the second connecting frame 15 drives the first connecting frame 11 to move away from the fixed frame 5. When the first connecting frame 11 moves, the first connecting frame 11 drives the first insertion rod 13 to separate from the first insertion slot 10. At the same time, the first connecting frame 11 pulls the first spring 14, causing the first insertion rod 13 to be pulled away from the support column 10. A spring 14 stores the pulling force. After the first insertion rod 13 separates from the first insertion slot 10, the position of the first connecting rod 6 can be adjusted. While adjusting the position of the first connecting rod 6, the first connecting rod 6 drives the traction mechanism 4 to move the position of the patient being tractioned. After the adjustment is completed, the pulled second connecting frame 15 can be released, and then the first spring 14 releases the stored force to drive the first insertion rod 13 and the first connecting frame 11 to reset, so that the first insertion rod 13 is inserted into the corresponding first insertion slot 10, thereby limiting the position of the first connecting rod 6.

[0039] Specifically, the clamping mechanism 2 includes a frame 18, the upper end of which is fixedly connected to the bottom of the support column 1. A clamping plate 19 is provided inside the frame 18. One side of the clamping plate 19 is in contact with the frame 18. An anti-slip strip 20 is fixedly connected to the upper end of the clamping plate 19. A screw 21 is rotatably connected to the middle of the lower end of the clamping plate 19. The lower end of the screw 21 passes through the frame 18 and extends to the outer side of the lower end of the frame 18 and is fixedly connected to a handle 22. The screw 21 is threadedly connected to the frame 18.

[0040] Through the above structural design, it can be seen that when the overall structure needs to be installed on the bed, the frame 18 can be inserted into one side of the bed, and then the handle 22 can be rotated. The rotation of the handle 22 can drive the screw 21 to rotate at the bottom of the clamping plate 19. When the screw 21 rotates, the connection between the screw 21 and the frame 18 can push the clamping plate 19 to move upward. The upward movement of the clamping plate 19 can drive the anti-slip strip 20 to clamp the bed. Through the cooperation of the frame 18 and the clamping plate 19, the overall structure can be firmly fixed to one side of the bed.

[0041] Example 2:

[0042] The traction frame provided in Embodiment 1 is further optimized, specifically, as follows: Figure 3 - Figure 6As shown, the first limiting mechanism 3 includes a second insertion rod 23. One end of the second insertion rod 23 is located inside the cavity and is slidably connected to the cavity. Slider 24s are fixedly connected to both sides of the end of the second insertion rod 23 located inside the cavity. Sliding grooves are provided on both sides of the cavity. The slider 24s are slidably connected to the sliding grooves. A second spring 25 is fixedly connected to the end of the second insertion rod 23 located inside the cavity. The end of the second spring 25 away from the second insertion rod 23 is fixedly connected to the inside of the cavity.

[0043] Specifically, the traction mechanism 4 includes a winding rod 26 and a second pulley 31. Connecting blocks 27 are rotatably connected to both sides of the winding rod 26. One end of the connecting block 27 near the support column 1 is fixedly connected to the support column 1. A turntable 28 is provided on the side of one connecting block 27 away from the winding rod 26. A second connecting rod 32 is fixedly connected to the middle of the turntable 28 near the connecting block 27. The end of the second connecting rod 32 away from the turntable 28 passes through the connecting block 27 and is fixedly connected to the winding rod 26. The second connecting rod 32 and the connecting block 26... 7. A torsion spring 36 is provided on the outer side of the second connecting rod 32 and at the position between the turntable 28 and the connecting block 27. One end of the torsion spring 36 is fixedly connected to the turntable 28, and the other end of the torsion spring 36 is fixedly connected to the connecting block 27. The circumferential array of the turntable 28 has multiple second insertion slots 29 corresponding to the second insertion rod 23. The second insertion rod 23 is inserted into the second insertion slot 29. The second pulley 31 is located at the upper end of the winding rod 26, and one end of the second pulley 31 is fixedly connected to the support column 1.

[0044] Furthermore, one end of a traction rope 30 is fixedly connected to the outside of the winding rod 26. The other end of the traction rope 30 passes around the second pulley 31 and is fixedly connected to the first pulley 8 vertically downward from the position of the first pulley 8 and to a connecting plate 33. A support base 34 is provided at the lower end of the connecting plate 33. Connecting ropes 35 are fixedly connected to both sides of the upper end of the support base 34. The upper end of the connecting ropes 35 is fixedly connected to the connecting plate 33.

[0045] Through the above structural design, it can be seen that the support seat 34 can provide traction support for the patient's legs. When it is necessary to adjust the traction height of the support seat 34, the second insertion rod 23 can be pressed into the cavity, thereby moving the second insertion rod 23 into the cavity. When the second insertion rod 23 moves into the cavity, it compresses the second spring 25 inside the cavity, causing the second spring 25 to store the compressing force. At the same time, when the second insertion rod 23 is pressed, the insertion of the second insertion rod 23 and the second insertion slot 29 is separated. After the second insertion rod 23 and the second insertion slot 29 are separated, the rotation limit of the turntable 28 can be released. When it is necessary to lower the traction of the support seat 34, the rotation limit of the turntable 28 can be released by pulling the support seat 34 downward, thereby pulling the traction rope 30 through the connecting plate 33. When the traction rope 30 is pulled, the traction rope 30 wound on the winding rod 26 is released outward. Simultaneously, the release of the traction rope 30 drives the winding rod 26 to rotate. The winding rod 26, through the second connecting rod 32, drives the turntable 28 to rotate. The rotation of the turntable 28 compresses the torsion spring 36, which stores the compressing force, thereby lowering the height of the support seat 34. When it is necessary to raise the height of the support seat 34, the pulled support seat 34 can be released, and the torsion spring 36 releases the stored force, driving the turntable 28 to rotate back to its original position. The rotation of the turntable 28, through the second connecting rod 32, drives the winding rod 26 to rotate back to its original position, thereby winding the traction rope 30, thus raising the height of the support seat 34. After adjustment, the pressed second insertion rod 23 can be released, and the second spring 25 releases the stored force to push the second insertion rod 23 to insert into the corresponding second insertion slot 29, thereby limiting the rotation of the turntable 28 and limiting the height position of the support seat 34.

Claims

1. A traction frame, characterized in that, The support includes a support column (1), a clamping mechanism (2) is provided at the lower end of the support column (1), a fixed frame (5) is fixedly connected to the upper end of the support column (1), a first connecting rod (6) is slidably connected inside the fixed frame (5), a first slot (7) is opened at one end of the first connecting rod (6), a first pulley (8) is rotatably connected inside the first slot (7), a traction mechanism (4) is provided at the lower end of the support column (1) and near the first pulley (8), a second limiting mechanism (9) is provided on one side of the support column (1), and a cavity is opened on the other side of the support column (1) at a position corresponding to the traction mechanism (4), and a first limiting mechanism (3) is provided inside the cavity.

2. A traction frame according to claim 1, characterized in that, The second limiting mechanism (9) includes a first connecting frame (11), which is located on one side of the fixed frame (5). Both ends of the first connecting frame (11) are provided with first guide rods (12). The end of the first guide rod (12) near the fixed frame (5) is fixedly connected to the fixed frame (5). Both ends of the first connecting frame (11) are slidably connected to the first guide rods (12) at both ends. A first insertion rod (13) is fixedly connected to the middle of the side of the first connecting frame (11) near the fixed frame (5). A second slot (17) is opened on the side of the fixed frame (5) near the first connecting frame (11) and corresponding to the first insertion rod (13). The second limiting mechanism (9) on the side near the first connecting frame (11) has multiple slots corresponding to the second slot (17). The first plug-in slot (10) is connected to the first plug-in slot (10) and the second slot (17). A first spring (14) is provided on the outside of the first plug-in rod (13) and at the position between the first connecting frame (11) and the fixed frame (5). One end of the first spring (14) is fixedly connected to the first connecting frame (11), and the other end of the first spring (14) is fixedly connected to the fixed frame (5). A second connecting frame (15) is fixedly connected to the middle of the lower end of the first connecting frame (11). A second guide rod (16) is provided at the lower end of the second connecting frame (15). One end of the second guide rod (16) near the support column (1) is fixedly connected to the support column (1), and the lower end of the second connecting frame (15) is slidably connected to the second guide rod (16).

3. A traction frame according to claim 2, characterized in that, The clamping mechanism (2) includes a frame (18), the upper end of which is fixedly connected to the bottom of the support column (1). A clamping plate (19) is provided inside the frame (18), one side of which is in contact with the frame (18). An anti-slip strip (20) is fixedly connected to the upper end of the clamping plate (19). A screw (21) is rotatably connected to the middle of the lower end of the clamping plate (19). The lower end of the screw (21) passes through the frame (18) and extends to the outside of the lower end of the frame (18) and is fixedly connected to a handle (22). The screw (21) is threadedly connected to the frame (18).

4. A traction frame according to claim 3, characterized in that, The first limiting mechanism (3) includes a second plug rod (23), one end of which is located inside the cavity and is slidably connected to the cavity. Sliders (24) are fixedly connected to both sides of the end of the second plug rod (23) located inside the cavity. Sliding grooves are provided on both sides of the cavity. The sliders (24) are slidably connected to the sliding grooves. A second spring (25) is fixedly connected to the end of the second plug rod (23) located inside the cavity. The end of the second spring (25) away from the second plug rod (23) is fixedly connected to the inside of the cavity.

5. A traction frame according to claim 4, characterized in that, The traction mechanism (4) includes a winding rod (26) and a second pulley (31). Connecting blocks (27) are rotatably connected to both sides of the winding rod (26). One end of each connecting block (27) near the support column (1) is fixedly connected to the support column (1). A turntable (28) is provided on the side of one connecting block (27) away from the winding rod (26). A second connecting rod (32) is fixedly connected to the middle of the turntable (28) near the connecting block (27). The end of the second connecting rod (32) away from the turntable (28) passes through the connecting block (27) and is fixedly connected to the winding rod (26). The second connecting rod (32) and the connecting block (26) are... 7) Rotary connection, a torsion spring (36) is provided on the outer side of the second connecting rod (32) and at the position between the turntable (28) and the connecting block (27). One end of the torsion spring (36) is fixedly connected to the turntable (28), and the other end of the torsion spring (36) is fixedly connected to the connecting block (27). The turntable (28) has a plurality of second insertion slots (29) corresponding to the second insertion rod (23) in a circumferential array. The second insertion rod (23) is inserted into the second insertion slots (29). The second pulley (31) is located at the upper end of the winding rod (26), and one end of the second pulley (31) is fixedly connected to the support column (1).

6. A traction frame according to claim 5, characterized in that, One end of a traction rope (30) is fixedly connected to the outside of the winding rod (26). The other end of the traction rope (30) passes around the second pulley (31) and is perpendicularly downward from the position of the first pulley (8) and fixedly connected to a connecting plate (33). A support seat (34) is provided at the lower end of the connecting plate (33). Connecting ropes (35) are fixedly connected to both sides of the upper end of the support seat (34). The upper end of the connecting ropes (35) is fixedly connected to the connecting plate (33).

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