Cross rod structure of chair frame

Abstract

The utility model discloses a cross rod structure of a chair frame, and aims to overcome the defects that the transverse pulling force of chair cloth is increased and a back rod is easy to deform when being pulled by the chair cloth due to the fact that the distance between two frame bodies is increased in the folding process of a folding machine. The foldable clothes rack comprises two crossed rods which can be installed between two rack bodies in a foldable mode, the two crossed rods are connected together to form an X-shaped structure, connecting supporting rods are connected between the upper portions of the two crossed rods and the two rack bodies in a rotating mode, two connecting portions are arranged on the connecting supporting rods, at least one connecting supporting rod is a waist groove rod, and the other connecting supporting rod is a waist groove rod. And at least one of the two connecting parts on the waist groove rod is a connecting waist groove, and the two connecting parts are rotationally connected with the cross rod and the frame body respectively. According to the cross rod structure of the chair frame, the pulling force of the chair cloth on the back rod can be reduced in the folding process of the chair frame, and the back rod is not easy to deform.

Description

Technical Field

[0001] The utility model relates to the technical field of folding chairs, and more specifically, it relates to a cross-bar structure of a chair frame. Background Art

[0002] Folding chairs have a wide market due to their advantages of being foldable, occupying little space, and being convenient to carry. A folding chair only includes a chair frame and a chair cloth. The chair cloth is connected to the chair frame, and a person sits on the chair cloth. During the folding and unfolding process, only the chair frame needs to be folded and unfolded. At present, during the folding process of a folding chair, the distance between the left frame body and the right frame body will first increase and then decrease. The increase in the distance between the left frame body and the right frame body increases the lateral pulling force on the chair cloth, and the back rod is easily deformed under the pulling of the chair cloth. Summary of the Utility Model

[0003] In order to overcome the above deficiencies, the utility model provides a cross-bar structure of a chair frame, which can reduce the pulling force of the chair cloth on the back rod during the folding process of the chair frame, and the back rod is not easily deformed.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme: A cross-bar structure of a chair frame includes two cross-bars that can be foldably installed between two frame bodies. The two cross-bars are connected together to form an "X" shape. There are connecting support rods rotatably connected between the upper parts of the two cross-bars and the two frame bodies. Two connecting parts are provided on the connecting support rods. At least one connecting support rod is a waist groove rod, and at least one of the two connecting parts on the waist groove rod is a connecting waist groove. The two connecting parts are respectively rotatably connected to the cross-bar and the frame body.

[0005] The chair cloth is installed on the chair frame to form a complete folding chair structure. When in use, the two frame bodies are unfolded in a direction away from each other, so as to realize the unfolding of the chair cloth. At this time, the upper parts of the two cross-bars are away from each other, and the lower parts are also away from each other. The connecting support rods are connected between the cross-bar and the frame body. A person sits on the chair cloth, which is stable and reliable. When it is necessary to fold the folding chair, the two cross-bars are pulled and folded in a direction close to each other. Since at least one of the connecting parts on the support link is a connecting waist groove, there is a movable space at the position of the connecting waist groove during the folding process. The distance between the two frame bodies does not first increase and then decrease, but directly decreases, avoiding increasing the pulling force on the chair cloth and preventing the back rod from being deformed due to the large pulling force of the chair cloth.

[0006] The cross-bar structure of the chair frame in this patent application can reduce the pulling force of the chair cloth on the back rod during the folding process of the chair frame, and the back rod is not easily deformed.

[0007] Preferably, the two connecting parts on the connecting support rod are both connected with pin shafts. The two pin shafts are respectively connected to the frame body and the cross-bar, and the pin shafts are slidably inserted and connected with the connecting waist groove.

[0008] The rotation of both ends of the connecting rod is realized through a pin shaft, ensuring the reliable deployment and folding of the two cross rods. The pin shaft is slidably inserted into the connecting waist groove, and the pin shaft slides along the connecting waist groove during the deployment and folding processes to avoid getting stuck, which may cause the distance between the two frames to increase, thereby increasing the pulling force on the chair cloth.

[0009] Preferably, a transverse stop bar is provided on the upper part of one cross rod; the transverse stop bar extends forward or backward; the transverse stop bar abuts against the frame.

[0010] The transverse stop bar abuts against the inner side of the frame to prevent the cross rod from sliding to the outside of the frame due to movement. When the transverse stop bar extends forward, it can provide a larger area for leg support, making it more comfortable. When the transverse stop bar extends backward, the cross rod can only move longitudinally.

[0011] In another solution, two transverse stop bars are provided on the upper part of one cross rod, and the two transverse stop bars extend forward and backward respectively; the transverse stop bars abut against the frame.

[0012] Setting two transverse stop bars on the cross rod not only realizes the positioning of the cross rod but also provides a larger area for leg support, making it more comfortable.

[0013] Preferably, the cross rod is supported on the connecting rod after deployment.

[0014] The cross rod is supported on the connecting rod after deployment, ensuring the stability of the entire chair frame.

[0015] Preferably, a protective pad is installed on the connecting rod, and the protective pad is supported between the cross rod and the connecting rod.

[0016] The protective pad plays a protective role to prevent wear on the surface during the process of the connecting rod supporting the cross rod.

[0017] Preferably, downwardly turned connecting flanges are provided on both sides of the connecting rod, and the two connecting parts are respectively arranged at positions near the ends on the two flanges.

[0018] The connecting flanges are beneficial to improving the structural strength of the connecting rod and enhancing the stability of the entire chair frame.

[0019] Preferably, reinforcing ribs are provided on the connecting rod.

[0020] The reinforcing ribs can improve the structural strength of the connecting rod and prevent deformation.

[0021] Preferably, the bottom of the frame is in an inverted V-shaped structure, and the frame is formed into a frame-like structure by bending a single pipe fitting, and the two ends of the pipe fitting are tightly connected to form a backrest extension rod.

[0022] The frame of this structure is directly bent from a single pipe fitting, with fewer connection points and good overall structural strength. The inverted V-shaped structure at the bottom provides more stable support.

[0023] In another solution, the frame includes a backrest rod and a U-shaped connecting rod. The upper end of the connecting rod is connected to the backrest rod, and the lower part of the connecting rod is horizontally arranged to form a support crossbar. The lower end of the backrest rod is connected to the support crossbar, and anti-slip pads are installed at both ends of the support crossbar.

[0024] The frame formed by connecting the backrest rod and the connecting rod is convenient to assemble, and the two protective pads installed on the support crossbar play the roles of support and anti-slip.

[0025] Compared with the prior art, the beneficial effects of the present utility model are as follows: (1) The crossbar structure of the chair frame in this patent application can reduce the pulling force of the chair cloth on the backrest rod during the folding process of the chair frame, and the backrest rod is not easily deformed; (2) The horizontal blocking bar blocks the inner side of the frame to prevent the crossbar from sliding to the outside of the frame due to movement. When the horizontal blocking bar extends forward, it can provide a larger area of leg support and is more comfortable. When the horizontal blocking bar extends backward, the crossbar can only move longitudinally. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present utility model.

[0027] Figure 2 It is a schematic structural diagram of the waist groove rod connection of the present utility model.

[0028] Figure 3 It is a schematic structural diagram of Embodiment 2 of the present utility model.

[0029] Figure 4 It is a structural diagram of a connecting support rod of Embodiment 2 of the present utility model.

[0030] Figure 5 It is a schematic diagram of the adjusting mechanism of Embodiment 8 of the present utility model.

[0031] In the figure: 1. Frame, 2. Crossbar, 3. Connecting support rod, 4. Waist groove rod, 5. Connecting waist groove, 6. Pin shaft, 7. Connecting hole, 8. Protective pad, 9. Reinforcing rib, 10. Horizontal blocking bar, 11. Diagonal rod, 12. Seat cloth rod, 13. Connecting head, 14. Plastic end cap, 15. Backrest extension rod, 16. Mounting rod, 17. Backrest rod, 18. Connecting rod, 19. Support crossbar, 20. Anti-slip pad, 21. Connecting sleeve, 22. Adjusting sleeve, 23. Mounting seat, 24. Convex ring, 25. Limiting block, 26. Operating knob, 27. Flange. Detailed Embodiments

[0032] The following will further specifically describe the technical solutions of the present utility model through specific embodiments in combination with the drawings:

[0033] Embodiment 1: A cross-bar structure of a chair frame (see attached Figure 1 , attached Figure 2 ), including two cross-bars 2 that can be foldably installed between two frames 1. Both cross-bars 2 are in a U-shaped structure with the opening facing downwards. The two cross-bars 2 are connected together to form an "X" shape. The middle parts of the two cross-bars 2 are hinged together through a hinge shaft. There are rotating connection struts 3 between the upper parts of the two cross-bars 2 and the two frames 1. After the cross-bars 2 are unfolded, the upper parts are supported on the connection struts 3. Two connection parts are provided on the connection struts 3. At least one connection strut 3 is a waist-groove bar 4. At least one of the two connection parts on the waist-groove bar 4 is a connection waist-groove 5. The two connection parts are respectively rotatably connected to the cross-bar 2 and the frame 1.

[0034] In this embodiment, the connection strut 3 connected to the rear part of the right frame 1 is a waist-groove bar 4, and the connection part on the waist-groove bar 4 connected to the cross-bar 2 is a connection waist-groove 5. That is to say, in this embodiment, one waist-groove bar 4 is provided, and one connection waist-groove 5 is provided on this waist-groove bar 4, and this connection waist-groove 5 is connected to the cross-bar 2.

[0035] Both connection parts on the connection strut 3 are connected with pin shafts 6. The two pin shafts 6 are respectively connected to the frame 1 and the cross-bar 2. The pin shaft 6 is slidably inserted into the connection waist-groove 5. Connection holes 7 are provided in the connection parts of the connection strut 3, and the connection holes 7 in the connection part of the waist-groove bar 4 directly form a long strip-shaped connection waist-groove 5. The connection strut 3 is connected to the pin shaft 6 through the connection hole 7 or the connection waist-groove 5, so that the connection strut 3 can rotate around the pin shaft 6. The pin shaft 6 at one end of the connection strut 3 is riveted to the cross-bar 2, and the pin shaft 6 at the other end of the connection strut 3 is riveted to the frame 1.

[0036] A protective pad 8 is installed on the connection strut 3. The protective pad 8 is supported between the cross-bar 2 and the connection strut 3. An opening facing downwards is provided on the protective pad 8. The opening of the slot of the protective pad 8 facing downwards is inserted onto the connection strut 3, and the protective pad 8 and the connection strut 3 are firmly connected by screws. The cross-bar 2 is supported on the protective pad 8 to prevent surface damage. Reinforcing ribs 9 are provided on the connection strut 3. The reinforcing ribs 9 can improve the structural strength of the connection strut 3, thereby improving the load-bearing capacity of the connection strut 3.

[0037] Two transverse bars 10 are provided on the upper part of a cross bar 2. The two transverse bars 10 extend forward and backward respectively. The transverse bars 10 are blocked on the frame 1. The transverse bars 10 are arranged on the cross bar 2 connected to the right frame 1 at the upper part. The cross bar 2 connected to the waist groove rod 4 includes two inclined bars 11 and a seat cloth rod 12 connected between the two inclined bars 11. The other cross bar 2 is formed into a U-shaped structure by bending a single pipe. One end of the inclined bar 11 is provided with a C-shaped connecting head 13. The connecting head 13 fits to the outer wall of the seat cloth rod 12 and the fastening between the connecting head 13 and the seat cloth rod 12 is realized by rivets. A plastic end cap 14 is inserted and connected at the transverse bar 10. The fastening between the plastic end cap 14 and the seat cloth rod 12 is realized by rivets. After the cross bar 2 is fully unfolded, it is blocked on the frame 1 by the plastic end cap 14 instead of the transverse bar 10 directly blocking on the frame 1, reducing wear.

[0038] The bottom of the frame 1 is in an inverted V-shaped structure. The frame 1 is formed into a frame-like structure by bending a single pipe fitting. The two ends of the pipe fitting are tightly connected to form a backrest extension rod 15. The upper and lower parts of the cross bar 2 are respectively connected to the two frames 1. The two cross bars 2 are inclined. The height of the cross bar 2 after unfolding is lower than the height of the upper frame of the frame 1.

[0039] The chair cloth is installed on the chair frame to form a complete folding chair structure. When in use, the two frames 1 are unfolded in the direction away from each other, so as to realize the unfolding of the chair cloth. At this time, the upper parts of the two cross bars 2 are away from each other, and the lower parts are also away from each other. The connecting support rod 3 is connected between the cross bar 2 and the frame 1. People sit on the chair cloth, which is stable and reliable. When the folding chair needs to be folded, the two cross bars 2 are pulled and folded in the direction close to each other. Since at least one connecting part on at least one support link is a connecting waist groove 5, there is a movable space at the position of the connecting waist groove 5 during the folding process. The distance between the two frames 1 does not increase first and then decrease, but directly decreases, avoiding increasing the pulling force on the chair cloth and preventing the back rod from being deformed due to the large pulling force of the chair cloth.

[0040] Embodiment 2: A cross bar structure of a chair frame (see attached Figure 3 and attached Figure 4 ), including two cross bars 2 that can be foldably installed between two frames 1. The two cross bars 2 are both in a U-shaped structure with the opening facing down. The two cross bars 2 are connected together to form an "X" shape. The middle parts of the two cross bars 2 are hinged together by a hinge shaft. There are rotatably connected connecting support rods 3 between the upper parts of the two cross bars 2 and the two frames 1. The upper part of the cross bar 2 is supported on the connecting support rod 3 after unfolding. Two connecting parts are provided on the connecting support rod 3. At least one connecting support rod 3 is a waist groove rod 4. At least one of the two connecting parts on the waist groove rod 4 is a connecting waist groove 5. The two connecting parts are respectively rotatably connected to the cross bar 2 and the frame 1.

[0041] In this embodiment, the connecting rod 3 connected to the rear part of the right frame body 1 is a waist groove rod 4, and the connecting part of the waist groove rod 4 connected to the cross rod 2 is a connecting waist groove 5. That is to say, in this embodiment, a waist groove rod 4 is provided, and a connecting waist groove 5 is provided on the waist groove rod 4, and the connecting waist groove 5 is connected to the cross rod 2.

[0042] Both connecting parts on the connecting rod 3 are connected with pin shafts 6, and the two pin shafts 6 are respectively connected to the frame body 1 and the cross rod 2. The pin shaft 6 is slidably inserted and connected to the connecting waist groove 5. Connecting holes 7 are provided at the connecting parts of the connecting rod 3, and the connecting holes 7 at the connecting parts on the waist groove rod 4 directly form a long strip-shaped connecting waist groove 5. The connecting rod 3 is connected to the pin shaft 6 through the connecting hole 7 or the connecting waist groove 5, so that the connecting rod 3 can rotate around the pin shaft 6. The pin shaft 6 at one end of the connecting rod 3 is riveted to the cross rod 2, and the pin shaft 6 at the other end of the connecting rod 3 is riveted to the frame body 1.

[0043] A protective pad 8 is installed on the connecting rod 3, and the protective pad 8 is supported between the cross rod 2 and the connecting rod 3. A slot with an opening facing down is provided on the protective pad 8. The slot opening of the protective pad 8 is inserted downward onto the connecting rod 3, and the protective pad 8 and the connecting rod 3 are fixedly connected by screws. The cross rod 2 is supported on the protective pad 8 to prevent surface damage. Reinforcing ribs 9 are provided on the connecting rod 3, and the reinforcing ribs 9 can improve the structural strength of the connecting rod 3, thereby improving the bearing capacity of the connecting rod 3. Connecting flanges 27 that turn downward are provided on both sides of the two connecting rods 3 connected to the left frame body 1, and the two connecting parts are respectively arranged at positions near the ends on the two flanges 27, and the lower edges of the flanges 27 are inclined.

[0044] A transverse stop bar 10 is provided on the upper part of a cross rod 2; the transverse stop bar 10 extends forward or backward; the transverse stop bar 10 abuts against the frame body 1. In this embodiment, the transverse stop bar 10 extends backward. The transverse stop bar 10 is provided on the cross rod 2 connected to the upper part of the right frame body 1. The cross rod 2 connected to the waist groove rod 4 includes an inclined rod 11 and an L-shaped mounting rod 16, and the other cross rod 2 is formed by bending a single pipe into a U-shaped structure. A C-shaped connecting head 13 is provided at one end of the inclined rod 11, and the connecting head 13 is attached to the outer wall of the mounting rod 16 and the connecting head 13 and the mounting rod 16 are fastened by rivets. The transverse stop bar 10 is provided at the rear end of the mounting rod 16, and a plastic end cap 14 is inserted and connected at the transverse stop bar 10, and the plastic end cap 14 and the mounting rod 16 are fastened by rivets. After the cross rod 2 is fully unfolded, it is blocked on the frame body 1 by the plastic end cap 14 instead of the transverse stop bar 10 directly blocking on the frame body 1, reducing wear.

[0045] The frame body 1 includes a backrest rod 17 and a U-shaped connecting rod 18. The upper end of the connecting rod 18 is connected to the backrest rod 17. The lower part of the connecting rod 18 is horizontally arranged to form a support crossbar 19. The lower end of the backrest rod 17 is connected to the support crossbar 19. Anti-slip pads 20 are installed at both ends of the support crossbar 19. The upper and lower parts of the crossbar 2 are respectively connected to the two frame bodies 1, and the two crossbars 2 are inclined. After the crossbar 2 is unfolded, its height is lower than that of the connecting rod 18.

[0046] Install the chair cloth on the chair frame to form a complete folding chair structure. When in use, unfold the two frame bodies 1 in the direction away from each other, so as to realize the unfolding of the chair cloth. At this time, the upper parts of the two crossbars 2 are away from each other, and the lower parts are also away from each other. The connecting support rod 3 is connected between the crossbar 2 and the frame body 1. People can sit on the chair cloth stably and reliably. When the folding chair needs to be folded, pull the two crossbars 2 in the direction close to each other for folding. Since at least one connecting part on the support connecting rod is a connecting waist slot 5, there is a movable space at the position of the connecting waist slot 5 during the folding process. The distance between the two frame bodies 1 does not increase first and then decrease, but directly decreases, avoiding increasing the pulling force on the chair cloth and preventing the back rod from being deformed due to the large pulling force of the chair cloth.

[0047] Embodiment 3: A crossbar structure of a chair frame, whose structure is similar to that of Embodiment 1 or Embodiment 2. The main difference is that in this embodiment, the connecting support rod 3 connected to the rear part of the right frame body 1 is a waist slot rod 4, and the connecting part of the waist slot rod 4 connected to the frame body 1 is a connecting waist slot 5. That is to say, in this embodiment, a waist slot rod 4 is provided, and a connecting waist slot 5 is provided on the waist slot rod 4, and the connecting waist slot 5 is connected to the frame body 1. Other structures are the same as those in Embodiment 1 or Embodiment 2.

[0048] Embodiment 4: A crossbar structure of a chair frame, whose structure is similar to that of Embodiment 1 or Embodiment 2. The main difference is that in this embodiment, the two connecting support rods 3 connected to the front and rear parts of the right frame body 1 are both waist slot rods 4, and the connecting part of the waist slot rod 4 connected to the crossbar 2 is a connecting waist slot 5. That is to say, in this embodiment, two waist slot rods 4 are provided, and a connecting waist slot 5 is provided on each of the two waist slot rods 4, and the connecting waist slot 5 is connected to the crossbar 2. Other structures are the same as those in Embodiment 1 or Embodiment 2.

[0049] Embodiment 5: A crossbar structure of a chair frame, whose structure is similar to that of Embodiment 1 or Embodiment 2. The main difference is that in this embodiment, the two connecting support rods 3 connected to the front and rear parts of the right frame body 1 are both waist slot rods 4, and the connecting part of the waist slot rod 4 connected to the frame body 1 is a connecting waist slot 5. That is to say, in this embodiment, two waist slot rods 4 are provided, and a connecting waist slot 5 is provided on each of the two waist slot rods 4, and the connecting waist slot 5 is connected to the frame body 1. Other structures are the same as those in Embodiment 1 or Embodiment 2.

[0050] Embodiment 6: The cross-bar structure of a chair frame is similar to that of Embodiment 1 or Embodiment 2. The main difference is that in this embodiment, the connecting rod 3 connected to the rear part of the right frame body 1 is a waist-groove rod 4, and both connecting parts on the waist-groove rod 4 are connecting waist-grooves 5. That is to say, in this embodiment, a waist-groove rod 4 is provided, and two connecting waist-grooves 5 are provided on the waist-groove rod 4. The two connecting waist-grooves 5 are respectively connected to the cross-bar 2 and the frame body 1. Other structures are the same as those in Embodiment 1 or Embodiment 2.

[0051] Embodiment 7: The cross-bar structure of a chair frame is similar to that of Embodiment 1 or Embodiment 2. The main difference is that in this embodiment, the two connecting rods 3 connected to the front and rear parts of the right frame body 1 are both waist-groove rods 4, and both connecting parts on the waist-groove rod 4 are connecting waist-grooves 5. That is to say, in this embodiment, two waist-groove rods 4 are provided, and two connecting waist-grooves 5 are provided on each of the two waist-groove rods 4. The two connecting waist-grooves 5 on the same connecting rod 3 are respectively connected to the cross-bar 2 and the frame body 1. Other structures are the same as those in Embodiment 1 or Embodiment 2.

[0052] Embodiment 8: A cross-bar structure of a chair frame (see attached Figure 5 ), which is similar to any one of Embodiments 1 to 7. The main difference is that in this embodiment, an adjustment mechanism is installed on the cross-bar 2. The adjustment mechanism includes a connecting sleeve 21. An adjustment sleeve 22 is threadedly connected to the outer wall of the connecting sleeve 21. An installation seat 23 is movably sleeved outside the connecting sleeve 21. The connecting part on the connecting rod 3 is rotatably connected to the installation seat 23. A convex ring 24 is provided on the adjustment sleeve 22. The installation seat 23 is connected with a limit block 25. The convex ring 24 is axially limited between the installation seat 23 and the limit block 25. The connecting sleeve 21 is fixedly connected to the cross-bar 2. The adjustment sleeve 22 rotates to adjust its position, thereby realizing the pushing and pulling of the installation seat 23 and adjusting the position of the installation seat 23. An operation handle 26 is provided on the outer wall of the adjustment sleeve 22. After the folding chair is used for a long time, the chair cloth will be deformed, resulting in the backrest part of the chair cloth not being tightened when the two frame bodies 1 are fully unfolded. At this time, by rotating the adjustment sleeve 22, the connection position between the cross-bar 2 and the connecting rod 3 is adjusted, so as to ensure that the chair cloth is in a tightened state when the two frame bodies 1 are fully unfolded, improving the riding comfort. Other structures are the same as any one of Embodiments 1 to 7.

[0053] The above-described embodiments are only preferred solutions of the present invention, and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. A cross-bar structure of a chair frame, characterized in that, It includes two cross bars that can be foldably installed between two frames. The two cross bars are connected together to form an "X" shaped structure. There are connecting support bars rotatably connected between the upper parts of the two cross bars and the two frames respectively. Two connecting parts are provided on the connecting support bars. At least one connecting support bar is a waist groove bar, and at least one of the two connecting parts on the waist groove bar is a connecting waist groove. The two connecting parts are rotatably connected to the cross bar and the frame respectively.

2. The cross-bar structure of a chair frame according to claim 1, characterized in that, The two connecting parts on the connecting support bar are both connected with pin shafts. The two pin shafts are respectively connected with the frame and the cross bar, and the pin shafts are slidably inserted and connected with the connecting waist groove.

3. The cross-bar structure of a chair frame according to claim 1, characterized in that, A transverse stop bar is provided on the upper part of one cross bar; the transverse stop bar extends forward or backward; the transverse stop bar abuts against the frame.

4. The cross-bar structure of a chair frame according to claim 1, characterized in that Two transverse stop bars are provided on the upper part of one cross bar, and the two transverse stop bars extend forward and backward respectively; the transverse stop bars abut against the frame.

5. The cross-bar structure of a chair frame according to claim 1, characterized in that The cross bar is supported on the connecting support bar after being unfolded.

6. The cross-bar structure of a chair frame according to claim 1, characterized in that, A protective pad is installed on the connecting support bar, and the protective pad is supported between the cross bar and the connecting support bar.

7. The cross-bar structure of a chair frame according to claim 1, characterized in that, Connecting flanges that turn downwards are provided on both sides of the connecting support bar, and the two connecting parts are respectively arranged at positions close to the ends on the two flanges.

8. A cross-bar structure of a chair frame according to any one of claims 1 to 7, characterized in that Reinforcing ribs are provided on the connecting support bar.

9. A cross-bar structure of a chair frame according to any one of claims 1 to 7, characterized in that, The bottom of the frame is in an inverted V-shaped structure. The frame is formed by bending a single pipe into a frame structure, and the two ends of the pipe are tightly connected to form a backrest extension rod.

10. A cross-bar structure of a chair frame according to any one of claims 1 to 7, characterized in that, The frame includes a backrest rod and a U-shaped connecting rod. The upper end of the connecting rod is connected to the backrest rod. The lower part of the connecting rod is horizontally arranged to form a support cross bar. The lower end of the backrest rod is connected to the support cross bar, and anti-slip pads are installed at both ends of the support cross bar.

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