A shock-absorbing wheelchair backrest

Abstract

The utility model discloses a wheelchair backrest frame of shock attenuation, including chair seat, still include backrest frame upper segment, backrest frame lower segment, the positive side below of backrest frame upper segment is connected with chair seat to the front, the elastic shock attenuation structure is swingly connected between backrest frame upper segment, backrest frame lower segment, the elastic shock attenuation structure of this product can effectively reduce the transmission of shock wave to backrest frame upper segment when meeting some pit, convex ridge, uneven road during the rolling of wheelchair pushing on the road surface, reduces the transmission of shock wave to chair seat, promotes the comfort of riding, and the weak shock wave of some flat road basically can be eliminated through the elastic shock attenuation structure, makes the patient (patient) sit on the wheelchair without shock feeling, makes the patient sit more comfortably, and the elastic shock attenuation device is used on the wheelchair, and the trolley is stable, and the balance shock attenuation effect is good.

Description

Technical Field

[0001] This utility model relates to a hinged folding frame, and more particularly to a horizontal hinged folding device. Background Technology

[0002] Chinese Patent Publication No. CN217917468U discloses a caster shock absorption device. This product has a caster mounting fork opening between the left and right forks of the caster fork, and a rolling caster is installed there. A corresponding longitudinal elongated left axle hole and a longitudinal elongated right axle hole are horizontally opened at the bottom of the left and right forks. The caster axle passes through the rolling caster and exits through the corresponding longitudinal elongated left and right axle holes. Corresponding left and right caster shock absorption devices are connected to the left and right outer ends of the caster axle, and these devices are movably connected to the outer walls of the corresponding left and right forks. This product provides more balanced force distribution between the two caster shock absorption devices. When the rolling caster encounters potholes, bumps, uneven surfaces, or rough roads during rolling, the two shock absorption devices simultaneously balance and absorb shock at both ends of the caster axle, thus achieving a dual-balance shock absorption effect for the rolling caster.

[0003] Currently, most wheelchairs have elastic shock-absorbing devices installed on the wheelchair casters or between the casters and the frame. This increases the complexity of the caster structure or the structure between the casters and the frame. Since they are close to the ground, they tend to accumulate dust or mud after a period of use, making them difficult to clean.

[0004] Chinese Patent Publication No. CN222584846U discloses a folding wheelchair. The rear of the seat is hinged to the middle section of the backrest frame; the front bottom of the seat is hinged to the top of the front leg frame; the front leg frame is hinged to the front end of a support device, and the rear end of the support device is hinged to the lower part of the backrest frame; a locking device is connected to the front bottom of the seat; a positioning frame is laterally connected to the front bottom of the seat; the bottom of an elastic shock-absorbing device is movably connected to the middle of the front leg frame, and the top of the elastic shock-absorbing device is fixedly connected to the positioning frame; the locking device and the positioning frame are lockable and can be opened; this product allows for easy unlocking and folding of the wheelchair by opening the locking device from the front; an elastic shock-absorbing device is formed between the front leg frame and the seat.

[0005] The above increases the structural complexity between the seat and the front leg frame. The elastic shock absorption device is only set in the middle, and the shock absorption effect is not ideal. When a person sits in the wheelchair, the weight is at the rear. The elastic shock absorption device should be installed at the front and below the seat, which is not ideal for shock absorption at the rear of the wheelchair. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a shock-absorbing wheelchair backrest frame with a reasonable structural design, elastic shock absorption device, stable trolley use, and good balance and shock absorption effect.

[0007] The solution to the above technical problem is as follows: A shock-absorbing wheelchair backrest frame includes a seat, and the wheelchair backrest frame also includes an upper backrest frame section and a lower backrest frame section; the seat is connected forward from the lower front of the upper backrest frame section; and an elastic shock-absorbing structure is movably connected between the upper backrest frame section and the lower backrest frame section.

[0008] The elastic damping structure includes a left damping device and a right damping device; the left and right sides of the upper and lower sections of the backrest frame are movably connected to corresponding left and right damping devices.

[0009] The upper section of the backrest frame includes an upper left vertical bar, an upper horizontal bar, and an upper right vertical bar. An upper horizontal bar is fixedly connected between the upper left vertical bar and the upper right vertical bar. The upper left vertical bar and the upper right vertical bar are connected together to the lower front of the chair seat. The lower section of the backrest frame includes a lower left vertical bar and a lower right vertical bar; A left shock absorber is movably connected between the bottom of the upper left vertical rod and the top of the lower left vertical rod. A right shock absorber is movably connected between the bottom of the upper right vertical rod and the top of the lower right vertical rod.

[0010] The lower left vertical rod is made of hollow metal tubing; the lower right vertical rod is made of hollow metal tubing. The left shock absorber includes a left pressure spring and a left positioning core. The left pressure spring passes through the left positioning core. The top of the left positioning core is vertically fixed to the bottom of the upper left vertical rod. The lower section of the left positioning core is inserted into the tube hole from the top of the lower left vertical rod. The left pressure spring is clamped between the bottom of the upper left vertical rod and the top of the lower left vertical rod. The right shock absorber includes a right pressure spring and a right positioning core. The right pressure spring passes through the right positioning core. The top of the right positioning core is vertically fixed to the bottom of the upper right vertical rod. The lower section of the right positioning core is inserted into the tube hole from the top of the lower right vertical rod. The right pressure spring is clamped between the bottom of the upper right vertical rod and the top of the lower right vertical rod.

[0011] A left anti-detachment device is provided between the bottom end of the left positioning core and the top opening of the left lower vertical rod. The left anti-detachment device prevents the left positioning core from detaching from the top opening of the left lower vertical rod. A right anti-detachment device is provided between the bottom end of the right positioning core and the top opening of the right lower vertical rod. The right anti-detachment device prevents the right positioning core from detaching from the top opening of the right lower vertical rod.

[0012] The left anti-detachment device includes a left anti-detachment protrusion and a left limiting ring; the bottom end of the left positioning core is fixed with a left anti-detachment protrusion; the top opening of the left lower vertical rod is fixed with a left limiting ring, and the lower section of the left positioning core passes through the left limiting ring and is inserted into the tube hole from the top of the left lower vertical rod; the left positioning core is prevented from detaching by the cooperation of the left anti-detachment protrusion and the left limiting ring. The right anti-detachment device includes a right anti-detachment protrusion and a right limiting ring; the bottom end of the right positioning column core is fixed with the right anti-detachment protrusion; the top opening of the right lower vertical rod is fixed with the right limiting ring, and the lower section of the right positioning column core passes through the right limiting ring and is inserted into the tube hole from the top of the right lower vertical rod; the right positioning column core is prevented from detaching by the cooperation of the right anti-detachment protrusion and the right limiting ring.

[0013] A left stop is fixed to the middle wall of the tube hole of the lower left vertical rod; a right stop is fixed to the middle wall of the tube hole of the lower right vertical rod.

[0014] A lower horizontal bar is fixedly connected between the lower left vertical bar and the lower right vertical bar.

[0015] The upper left vertical rod is made of hollow metal tubing; the upper right vertical rod is made of hollow metal tubing. The top of the left positioning core is vertically inserted into the bottom tube hole of the upper left vertical rod for fixed connection; The top of the right positioning core is vertically inserted into the bottom tube hole of the upper right vertical rod for fixed connection.

[0016] A left reinforcing ring is fixed to the bottom opening of the upper left vertical rod, and the left reinforcing ring is fixedly connected to the left positioning core; a right reinforcing ring is fixed to the bottom opening of the upper right vertical rod, and the right reinforcing ring is fixedly connected to the right positioning core.

[0017] A chair seat is hinged to the lower front of the upper section of the backrest frame; the chair seat includes a cushion and a base frame, the cushion is fixed to the top of the base frame, the left rear end of the base frame is hinged to the lower left front of the upper section of the backrest frame, and the right rear end of the base frame is hinged to the lower right front of the upper section of the backrest frame.

[0018] The beneficial effects of this shock-absorbing wheelchair backrest frame are as follows: 1. The elastic shock-absorbing structure of this product effectively reduces the transmission of vibration waves to the upper part of the backrest frame and the seat when the wheelchair encounters potholes, bumps, uneven surfaces, etc., improving riding comfort. For weak vibration waves generated on smooth surfaces, the elastic shock-absorbing structure can essentially eliminate them, making the patient feel no vibration while sitting in the wheelchair, thus increasing comfort. This elastic shock-absorbing device provides good stability and balanced shock absorption when used on a wheelchair. 2. This structure is simple, uses few parts, is easy to assemble, reduces production costs, and has a small overall size. 3. Being relatively high off the ground, it is less prone to accumulating dust and dirt, making it easy to clean. Attached Figure Description

[0019] Figure 1 This is a perspective view of the product of this utility model.

[0020] Figure 2 This is a side view of the upper left vertical rod, the left shock-absorbing device, and the lower left vertical rod of the present invention.

[0021] Figure 3 This is a side sectional view of the upper left vertical rod, the left shock-absorbing device, and the lower left vertical rod of the present invention.

[0022] Figure 4 This is a side structural cross-sectional view of the upper left vertical bar and the lower left vertical bar of the present invention.

[0023] Figure 5 This is a side view of the upper right vertical rod, the right shock-absorbing device, and the lower right vertical rod of the present invention.

[0024] Figure 6 This is a side structural cross-sectional view of the upper right vertical rod, the right shock-absorbing device, and the lower right vertical rod of the present invention.

[0025] Figure 7 This is a side structural cross-sectional view of the upper right vertical bar and the lower right vertical bar of the present invention.

[0026] Figure 8 This is a perspective view of the connection structure of the product of this utility model, including a metal base frame, an upper backrest frame, a lower backrest frame, and wheelchair legs.

[0027] Figure 9 This is a perspective view of the connection structure of the product of this utility model, including the chair seat, the upper section of the backrest frame, the lower section of the backrest frame, and the wheelchair legs.

[0028] Figure 10 This is an exploded view of the connection structure of the product of this utility model, including the chair seat, the upper section of the backrest frame, the lower section of the backrest frame, and the wheelchair legs.

[0029] Chair seat 1, seat cushion 11, metal base frame 12, upper backrest frame 2, upper left vertical bar 21, left reinforcing ring 211, upper horizontal bar 22, upper right vertical bar 23, right reinforcing ring 231, lower backrest frame 3, lower left vertical bar 31, lower horizontal bar 32, lower right vertical bar 33, elastic shock absorption structure 4, left shock absorption device 41, pressure spring 411, left positioning column core 412, right shock absorption device 42, right pressure spring 421, right positioning column core 422, left anti-detachment device 5, left anti-detachment protrusion 51, left limiting ring 52, right anti-detachment device 6, right anti-detachment protrusion 61, right limiting ring 62, left stop 7, right stop 8. Detailed Implementation

[0030] like Figures 1-10 As shown: A shock-absorbing wheelchair backrest frame includes a seat 1, with a wheelchair leg frame connected to the front bottom of the seat 1. The four angles of the wheelchair leg frame are used to connect and install wheelchair casters. The shock-absorbing wheelchair backrest frame also includes an upper backrest frame 2 and a lower backrest frame 3. A backrest cushion is connected to the upper backrest frame 2. The seat 1 is connected forward from the front bottom of the upper backrest frame 2. An elastic shock-absorbing structure 4 is movably connected between the upper backrest frame 2 and the lower backrest frame 3. When the wheelchair encounters potholes, bumps, or uneven surfaces while being pushed on the road, the elastic shock-absorbing structure 4 effectively reduces the transmission of vibration waves to the upper backrest frame 2 and the seat 1, improving riding comfort. For some flat surfaces, the weak vibration waves can be largely eliminated by the elastic shock-absorbing structure 4, making the patient feel no vibration while sitting in the wheelchair, thus making the patient more comfortable. This elastic shock-absorbing device provides good stability and balance in wheelchair pushing. This structure is simple, uses fewer parts, is easy to assemble, reduces production costs, and has a small overall size; it is also relatively high off the ground, so it is less likely to accumulate dust and dirt, making it easy to clean.

[0031] Preferably, the elastic shock absorption structure 4 includes a left shock absorption device 41 and a right shock absorption device 42; the upper section 2 of the backrest frame and the lower section 3 of the backrest frame are movably connected on the left and right sides by corresponding left shock absorption devices 41 and right shock absorption devices 42, which makes the wheelchair stable, symmetrical and balanced on the left and right sides, and improves the overall balance and shock absorption stability of the wheelchair. It can maintain stable shock absorption even in complex road conditions, further improving the comfort experience of the rider and reducing the discomfort that may be caused by sitting in a wheelchair for a long time; the symmetrical design of the left shock absorption device 41 and the right shock absorption device 42 further optimizes the vibration dispersion effect, so that the wheelchair can provide stable support and shock absorption in various road conditions, effectively relieving back pressure of the rider and improving the overall riding comfort.

[0032] Preferably, the upper section 2 of the backrest frame includes a left upper vertical bar 21, an upper horizontal bar 22, and a right upper vertical bar 23. The upper horizontal bar 22 is welded and fixedly connected between the left upper vertical bar 21 and the right upper vertical bar 23. The upper horizontal bar 22 is generally made of metal tubing. There is at least one upper horizontal bar 22, or there can be two or three upper horizontal bars 22. The front of the left upper vertical bar 21 and the right upper vertical bar 23 are connected to the chair seat 1, which supports the rear of the chair seat 1. The left upper vertical bar 21 and the right upper vertical bar 23 enhance the stability and firmness of the structure through the upper horizontal bar 22, making the overall structure of the backrest frame sturdy and not easily deformed, ensuring durability under long-term use.

[0033] The lower section 3 of the backrest frame includes a lower left vertical rod 31 and a lower right vertical rod 33; a lower horizontal rod 32 is welded and fixedly connected between the lower left vertical rod 31 and the lower right vertical rod 33. The lower horizontal rod 32 is generally made of metal tube, and there is at least one lower horizontal rod. The combination of the lower left vertical rod 31, the lower right vertical rod 33, and the lower horizontal rod enhances the stability and firmness of the structure.

[0034] A left shock absorber 41 is movably connected between the bottom of the upper left vertical rod 21 and the top of the lower left vertical rod 31; A right shock absorber 42 is movably connected between the bottom of the upper right vertical rod 23 and the top of the lower right vertical rod 33.

[0035] The above describes the specific structure of the upper section 2 and lower section 3 of the backrest frame, and the specific structure of their connection with the left shock absorption device 41 and the right shock absorption device 42, forming a frame-type wheelchair backrest shock absorption structure. This structure facilitates production and assembly.

[0036] Preferably, the lower left vertical rod 31 is made of a hollow metal tube, such as an iron tube, steel tube, or aluminum tube; the lower right vertical rod 33 is made of a hollow metal tube, such as an iron tube, steel tube, or aluminum tube. The left shock absorber 41 includes a left pressure spring 411 and a left positioning core 412. The left pressure spring 411 passes through the outer wall of the left positioning core 412. The top of the left positioning core 412 is vertically welded and fixed to the bottom of the upper left vertical rod 21. The lower section of the left positioning core 412 is inserted into the tube hole from the top of the lower left vertical rod 31, which plays a role in sliding and positioning up and down, so that it fits perfectly through. The left positioning core 412 can move up and down in the tube hole of the lower left vertical rod 31. The left pressure spring 411 is clamped between the bottom of the upper left vertical rod 21 and the top of the lower left vertical rod 31 to form elastic shock absorption. The right shock absorber 42 includes a right pressure spring 421 and a right positioning core 422. The right pressure spring 421 is inserted through the right positioning core 422. The top of the right positioning core 422 is vertically fixed to the bottom of the upper right vertical rod 23. The lower section of the right positioning core 422 is inserted into the tube hole from the top of the lower right vertical rod 33, which plays a role in sliding and positioning up and down, so that it fits perfectly through. The right positioning core 422 can move up and down in the tube hole of the lower right vertical rod 33. The right pressure spring 421 is clamped between the bottom of the upper right vertical rod 23 and the top of the lower right vertical rod 33 to form elastic shock absorption.

[0037] The aforementioned left damping device 41 and right damping device 42 have good structural balance and damping stability, provide smooth damping, and have a good vibration wave dispersion effect.

[0038] Preferably, a left anti-detachment device 5 is provided between the bottom end of the left positioning core 412 and the top opening of the left lower vertical rod 31. The left anti-detachment device 5 prevents the left positioning core 412 from detaching from the top opening of the left lower vertical rod 31, ensuring normal use.

[0039] A right anti-detachment device 6 is provided between the bottom end of the right positioning core 422 and the top opening of the right lower vertical rod 33. The right anti-detachment device 6 prevents the right positioning core 422 from detaching from the top opening of the right lower vertical rod 33, ensuring normal use.

[0040] Preferably, the left anti-detachment device 5 includes a left anti-detachment protrusion 51 and a left limiting ring 52; the left anti-detachment protrusion 51 is welded and fixed to the bottom end of the left positioning core 412; the left limiting ring 52 is welded and fixed to the top opening of the left lower vertical rod 31, and the lower section of the left positioning core 412 passes through the left limiting ring 52 and is inserted into the tube hole from the top of the left lower vertical rod 31; the left positioning core 412 is prevented from detaching by the cooperation of the left anti-detachment protrusion 51 and the left limiting ring 52. The size of the left anti-detachment protrusion 51 is larger than the annular hole of the left limiting ring 52, so the left anti-detachment protrusion 51 cannot be dislodged from the annular hole of the left limiting ring 52, thus achieving the anti-detachment of the left positioning core 412. This anti-detachment structure is simple, easy to manufacture, and small in size; the left limiting ring 52 can also reinforce the top opening of the left lower vertical rod 31 to prevent the tube opening from being weak and bursting.

[0041] The right anti-detachment device 6 includes a right anti-detachment protrusion 61 and a right limiting ring 62; the bottom end of the right positioning core 422 is welded and fixed with the right anti-detachment protrusion 61; the top opening of the right lower vertical rod 33 is welded and fixed with the right limiting ring 62, and the lower section of the right positioning core 422 passes through the right limiting ring 62 and is inserted into the tube hole from the top of the right lower vertical rod 33; the right positioning core 422 is prevented from detaching by the cooperation of the right anti-detachment protrusion 61 and the right limiting ring 62. The size of the right anti-detachment protrusion 61 is larger than the annular hole of the right limiting ring 62, so the right anti-detachment protrusion 61 cannot be dislodged from the annular hole of the right limiting ring 62, thus achieving the anti-detachment of the right positioning core 422. This anti-detachment structure is simple, easy to manufacture, and small in size; the left limiting ring 52 can also reinforce the top opening of the right lower vertical rod 33 to prevent the tube opening from being weak and bursting.

[0042] Preferably, a left stop 7 is horizontally or welded to the middle wall of the tube hole of the lower left vertical rod 31. When the bottom end of the left positioning core 412 is pressed down against the left stop 7, the downward movement is stopped, preventing the left pressure spring 411 from being over-compressed frequently and preventing the left positioning core 412 from being damaged due to excessive downward movement. A right stop 8 is fixed to the middle wall of the tube hole of the lower right vertical rod 33. When the bottom end of the right positioning core 422 is pressed down against the right stop 8, the downward movement is stopped, preventing the right pressure spring 421 from being over-compressed frequently and preventing the right positioning core 422 from being damaged due to excessive downward movement.

[0043] Preferably, the upper left vertical rod 21 is made of a hollow metal tube, such as an iron tube, steel tube, or aluminum tube; the upper right vertical rod 23 is made of a hollow metal tube, such as an iron tube, steel tube, or aluminum tube. The top of the left positioning core 412 is vertically inserted into the bottom tube hole of the upper left vertical rod 21 and welded to fix it, further providing the firmness of the fixed connection.

[0044] The top of the right positioning core 422 is vertically inserted into the bottom tube hole of the upper right vertical rod 23 and welded to fix it, further providing the firmness of the fixed connection.

[0045] Preferably, a left reinforcing ring 211 is welded and fixed to the bottom opening of the upper left vertical rod 21 to prevent the opening from becoming weak and bursting, thus thickening and reinforcing the opening. The left reinforcing ring 211 is fixedly connected to the left positioning core 412. A right reinforcing ring 231 is welded and fixed to the bottom opening of the upper right vertical rod 23 to prevent the opening from becoming weak and bursting, thus thickening and reinforcing the opening. The right reinforcing ring 231 is fixedly connected to the right positioning core 422.

[0046] Preferably, the upper section 2 of the backrest frame is hinged to the seat 1 at the lower front, which facilitates the hinged folding of the seat 1 and the upper section 2 of the backrest frame. When packaged or not in use, the hinged folding compresses the space and can be used to make a folding wheelchair. The above-mentioned hinge structure is simple, easy to assemble, low in cost, and durable.

[0047] Preferably, the chair seat 1 includes a seat cushion 11 and a metal base frame 12. The seat cushion 11 is fixed to the top of the metal base frame 12 with screws. The left rear end of the metal base frame 12 is movably hinged to the lower left front of the upper section 2 of the backrest frame, and the right rear end of the metal base frame 12 is movably hinged to the lower right front of the upper section 2 of the backrest frame, so as to facilitate the formation of a hinged folding structure.

[0048] That is: the left rear end of the metal base frame 12 is cross-connected with the lower part of the upper left vertical rod 21, and then a screw is used to pass through the left rear end of the metal base frame 12 and the lower left part of the upper left vertical rod 21 from the outside to fix it and form a movable hinge connection; the right rear end of the metal base frame 12 is cross-connected with the lower part of the upper right vertical rod 23, and then a screw is used to pass through the right rear end of the metal base frame 12 and the lower part of the upper right vertical rod 23 from the outside to fix it and form a movable hinge connection.

Claims

1. A shock-absorbing wheelchair backrest frame, including a seat, characterized in that: It also includes an upper backrest frame and a lower backrest frame; a chair seat is connected to the front of the upper backrest frame from below; an elastic shock-absorbing structure is movably connected between the upper backrest frame and the lower backrest frame; The elastic damping structure includes a left damping device and a right damping device; the left and right sides of the upper section and lower section of the backrest frame are movably connected to corresponding left and right damping devices. The upper section of the backrest frame includes an upper left vertical bar, an upper horizontal bar, and an upper right vertical bar. An upper horizontal bar is fixedly connected between the upper left vertical bar and the upper right vertical bar. The upper left vertical bar and the upper right vertical bar are connected together to the lower front of the chair seat. The lower section of the backrest frame includes a lower left vertical bar and a lower right vertical bar; A left shock absorber is movably connected between the bottom of the upper left vertical rod and the top of the lower left vertical rod. A right shock absorber is movably connected between the bottom of the upper right vertical rod and the top of the lower right vertical rod. The lower left vertical rod is made of hollow metal tubing; the lower right vertical rod is made of hollow metal tubing. The left shock absorber includes a left pressure spring and a left positioning core. The left pressure spring passes through the left positioning core. The top of the left positioning core is vertically fixed to the bottom of the upper left vertical rod. The lower section of the left positioning core is inserted into the tube hole from the top of the lower left vertical rod. The left pressure spring is clamped between the bottom of the upper left vertical rod and the top of the lower left vertical rod. The right shock absorber includes a right pressure spring and a right positioning core. The right pressure spring passes through the right positioning core. The top of the right positioning core is vertically fixed to the bottom of the upper right vertical rod. The lower section of the right positioning core is inserted into the tube hole from the top of the lower right vertical rod. The right pressure spring is clamped between the bottom of the upper right vertical rod and the top of the lower right vertical rod.

2. The shock-absorbing wheelchair backrest frame according to claim 1, characterized in that: A left anti-detachment device is provided between the bottom end of the left positioning core and the top opening of the left lower vertical rod. The left anti-detachment device prevents the left positioning core from detaching from the top opening of the left lower vertical rod. A right anti-detachment device is provided between the bottom end of the right positioning core and the top opening of the right lower vertical rod. The right anti-detachment device prevents the right positioning core from detaching from the top opening of the right lower vertical rod.

3. The shock-absorbing wheelchair backrest frame according to claim 2, characterized in that: The left anti-detachment device includes a left anti-detachment protrusion and a left limiting ring; the bottom end of the left positioning core is fixed with a left anti-detachment protrusion; the top opening of the left lower vertical rod is fixed with a left limiting ring, and the lower section of the left positioning core passes through the left limiting ring and is inserted into the tube hole from the top of the left lower vertical rod; the left positioning core is prevented from detaching by the cooperation of the left anti-detachment protrusion and the left limiting ring. The right anti-detachment device includes a right anti-detachment protrusion and a right limiting ring; the bottom end of the right positioning column core is fixed with a right anti-detachment protrusion; the top opening of the right lower vertical rod is fixed with a right limiting ring, and the lower section of the right positioning column core passes through the right limiting ring and is inserted into the tube hole from the top of the right lower vertical rod. The right positioning column core is prevented from detaching by the right anti-detachment protrusion and the right limit ring.

4. A shock-absorbing wheelchair backrest frame according to any one of claims 1 to 3, characterized in that: A left stop is fixed to the middle wall of the tube hole of the lower left vertical rod; a right stop is fixed to the middle wall of the tube hole of the lower right vertical rod.

5. A shock-absorbing wheelchair backrest frame according to any one of claims 1 to 3, characterized in that: A lower horizontal bar is fixedly connected between the lower left vertical bar and the lower right vertical bar.

6. A shock-absorbing wheelchair backrest frame according to any one of claims 1 to 3, characterized in that: The upper left vertical rod is made of hollow metal tubing; the upper right vertical rod is made of hollow metal tubing. The top of the left positioning core is vertically inserted into the bottom tube hole of the upper left vertical rod for fixed connection; The top of the right positioning core is vertically inserted into the bottom tube hole of the upper right vertical rod for fixed connection.

7. A shock-absorbing wheelchair backrest frame according to claim 6, characterized in that: A left reinforcing ring is fixed to the bottom opening of the upper left vertical rod, and the left reinforcing ring is fixedly connected to the left positioning core; a right reinforcing ring is fixed to the bottom opening of the upper right vertical rod, and the right reinforcing ring is fixedly connected to the right positioning core.

8. A shock-absorbing wheelchair backrest frame according to any one of claims 1 to 3, characterized in that: A chair seat is hinged to the lower front of the upper section of the backrest frame; the chair seat includes a cushion and a base frame, the cushion is fixed to the top of the base frame, the left rear end of the base frame is hinged to the lower left front of the upper section of the backrest frame, and the right rear end of the base frame is hinged to the lower right front of the upper section of the backrest frame.

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