Lightweight wheelchair frame structure

Abstract

A light-weight wheelchair frame structure comprises main body frames arranged on the two sides of a wheelchair, each main body frame is formed by splicing a plurality of rod pieces, each rod piece comprises a core material and a coating layer, each coating layer wraps the corresponding core material and is fixedly connected with the corresponding core material in an interference fit mode, each core material is an aluminum profile, and each coating layer is made of an aluminum alloy material. The coating layer is a thin steel pipe, the aluminum profile serves as a core material, the thin steel pipe serves as the coating layer, the aluminum profile and the thin steel pipe are in interference fit, light weight of the wheelchair frame is achieved, portability and flexibility are remarkably improved, the aluminum profile is reinforced and protected through high strength and hardness of the thin steel pipe, and the structural strength and safety of the wheelchair frame are guaranteed. Meanwhile, due to the design of the central hole of the core material main body part and the convex strip structure, the weight is reduced, the structural stability and the bending resistance are enhanced, the assembly process is simplified, and the connection stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, specifically to a lightweight wheelchair frame structure. Background Technology

[0002] Wheelchairs, as an important assistive mobility tool, are widely used by people with mobility impairments, such as the elderly and disabled. Traditional wheelchair frames are mostly made of steel. While steel has high strength, its weight makes the wheelchair bulky, increasing the difficulty of carrying and transporting it, and limiting its portability and flexibility. Furthermore, steel is prone to rust and corrosion, resulting in a shorter lifespan in humid or outdoor environments, requiring frequent maintenance and parts replacement, thus increasing operating costs.

[0003] In addition, aluminum profiles are increasingly being used in wheelchair manufacturing due to their lightweight and corrosion resistance. However, chair frames made of pure aluminum profiles are relatively weak and are prone to deformation or even damage when subjected to significant external impacts or prolonged high-load use, failing to meet the safety and reliability requirements of wheelchairs in actual use. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a lightweight wheelchair frame structure.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A lightweight wheelchair frame structure includes a main frame mounted on both sides of the wheelchair. The main frame is composed of multiple rods, each rod including a core material and a covering layer. The covering layer wraps around the core material and is fixedly connected to the core material by an interference fit. The core material is an aluminum profile, and the covering layer is a thin steel tube. The core material includes a main body located in the center and support parts located on the outer side of the main body. The main body has a square structure and a central hole is provided at the center of the main body. The support parts are provided in four sets and are respectively connected to the four corners of the main body.

[0007] Furthermore, the thickness of the coating layer is 0.3-0.8 mm.

[0008] In this utility model, the four structural walls of the main body are provided with protruding strip structures that protrude inward.

[0009] Furthermore, the support part has a T-shaped structure. The bottom of the support part is connected to the main body to form a support, and the top of the support part extends arcuately to both sides to form an arcuate surface. The core material is tightly attached to the inner side of the covering layer through the four arcuate surfaces, and an outward-facing cavity is formed between two adjacent sets of support parts.

[0010] In this utility model, the main frame includes an upper support rod, a front support rod, a rear support rod, and a lower support rod. The upper support rod and the front support rod are integrally formed, and the rear support rod and the lower support rod are integrally formed. The top end of the rear support rod is connected to the rear part of the upper support rod, and the front end of the lower support rod is connected to the lower part of the front support rod, thereby forming a frame.

[0011] Furthermore, the main frame also includes an axle support rod for mounting the rear wheel of the wheelchair. The two ends of the axle support rod are respectively connected between the upper support rod and the lower support rod to form a support, and the wheel axle of the wheelchair passes laterally through the middle of the axle support rod.

[0012] Furthermore, the main frame also includes an anti-tilt support rod, one end of which is connected to the rear support rod, and the other end extends downwards and tilts backwards. A roller is installed at the end of the anti-tilt support rod.

[0013] In this utility model, the chair frame structure also includes a backrest support, which is formed by combining two rods. The bottom of the backrest support is connected to the main frame through a connecting plate. The upper part of the rear support rod is provided with a pivot hole, and the rear part of the upper support rod is provided with a positioning hole. After the connecting plate is rotatably installed in the pivot hole, the backrest support can rock back and forth around the pivot hole. The connecting plate is also provided with multiple adjustment holes. A pin passes through the positioning hole and then through one of the adjustment holes to fix the backrest support. When the pin passes through different adjustment holes, the backrest support can be positioned at different angles.

[0014] This utility model has the following advantages and beneficial effects:

[0015] By using aluminum profiles as the core material and thin steel tubes as the cladding layer, and employing an interference fit between the two, the wheelchair frame is made lightweight, significantly improving portability and flexibility. The high strength and hardness of the thin steel tubes reinforce and protect the aluminum profiles, ensuring the structural strength and safety of the frame. Simultaneously, the design of the central hole and raised rib structure in the core material body reduces weight, enhances structural stability and bending resistance, simplifies the assembly process, and improves connection stability.

[0016] In addition, the modular design of the main frame and the bolt connection method further reduce the assembly difficulty, while the adjustable angle design of the backrest support enhances the comfort and personalization of use. Overall, it is highly practical and has significant comprehensive benefits. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the wheelchair in this embodiment;

[0019] Figure 2 This is a schematic diagram of the main frame structure in this embodiment;

[0020] Figure 3 This is a cross-sectional view of the rod in this embodiment;

[0021] Figure 4 This is a schematic diagram of the installation of the chair back bracket in this embodiment;

[0022] Figure 5 This is an anatomical diagram of the main frame in this embodiment. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. However, this utility model is not limited to the following embodiments.

[0024] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0026] like Figures 1 to 5As shown, this embodiment discloses a lightweight wheelchair frame structure, including a main frame 1 set on both sides of the wheelchair. The main frame 1 is spliced ​​from multiple rods. Each rod includes a core material 11 and a covering layer 12. The covering layer 12 wraps around the core material 11 and is tightly connected to the core material 11. Specifically, the connection is fixed by an interference fit. The core material 11 is made of aluminum profile stretched and formed. Aluminum profile has the characteristics of low density and light weight. Its density is about one-third that of steel, which can effectively reduce the overall weight of the wheelchair frame. For example, 6061-T6 aluminum alloy profile is selected. This profile has good mechanical properties and processing performance. The tensile strength can reach 290MPa and the yield strength is 240MPa, which can provide a certain structural strength while ensuring lightweight.

[0027] Furthermore, the cladding layer 12 is a thin steel tube, which has high strength and hardness, and can strengthen and protect the aluminum profile. For the main load-bearing members, the cladding layer 12 is made of Q235 steel thin tube with a thickness of 0.5-0.8mm to improve the local load-bearing capacity; in the parts with less stress, the cladding layer 12 is made of Q235 steel thin tube with a thickness of 0.3-0.5mm to further reduce the weight.

[0028] In this embodiment, the core material 11 has a specific structure including a main body 111 located in the middle and a support 112 located outside the main body 111. The main body 111 has a square structure and a central hole 110 is provided at the center of the main body 111. The central hole 110 reduces structural redundancy and reduces the weight of the core material 11 while ensuring structural strength. In addition, when splicing the end of one rod with the body of another rod, the bolt can be passed through the body of the rod and tightened into the central hole 110 at the end of the other rod to achieve fixation, eliminating the welding step and reducing the assembly difficulty.

[0029] Furthermore, in order to improve the structural stability of the main body 111, protruding rib structures 113 are provided on the four structural walls of the main body 111. The rib structures 113 can increase the wall thickness of the main body 111, and after being stretched and formed along the axial direction, they can improve the bending resistance of the rod. In addition, when the rods are spliced, after the bolts are tightened in the central hole 110, the inner rib structures 113 can clamp the bolts, thereby improving the connection stability.

[0030] Furthermore, the support portion 112 is provided in four sets and is respectively connected to the four corners of the main body portion 111. Specifically, the support portion 112 has a T-shaped structure. The bottom of the support portion 112 is connected to the main body portion 111 to form a support, and the top of the support portion 112 extends arcuately to both sides, so that the top of the support portion 112 forms an arcuate surface. The core material 11 is tightly attached to the inner side of the covering layer 12 through the four arcuate surfaces. In the above structure, an outward-facing cavity is formed between two adjacent sets of support portions 112. The cavity can absorb a certain amount of deformation. When it is necessary to drill holes in the rod, the cavity can also provide a positioning function.

[0031] In this embodiment, the main frame 1 includes an upper support rod 13, a front support rod 14, a rear support rod 15, and a lower support rod 16. The upper support rod 13 and the front support rod 14 are integrally formed, specifically by bending one of the rods in the middle. The rear support rod 15 and the lower support rod 16 are integrally formed, specifically by bending another rod in the middle. The top end of the rear support rod 15 is connected to the rear part of the upper support rod 13, and the front end of the lower support rod 16 is connected to the lower part of the front support rod 14, thereby forming a frame. Preferably, the upper support rod 13 and the rear support rod 15, and the lower support rod 16 and the front support rod 14 are all fixed by bolts. Specifically, the bolts pass through the upper support rod 13 and are tightened into the center hole 110 at the top end of the rear support rod 15, and the bolts pass through the front support rod 14 and are tightened into the center hole 110 at the front end of the lower support rod 16. Using bolts for fixing facilitates assembly and reduces assembly difficulty.

[0032] Furthermore, the main frame 1 also includes a wheel axle support rod 17 for mounting the rear wheel of the wheelchair. Both ends of the wheel axle support rod 17 are connected to the upper support rod 13 and the lower support rod 16 respectively by bolts to form a support. Similarly, two bolts are passed through the upper support rod 13 and the lower support rod 16 respectively and tightened to fix them in the center hole 110 at the end of the wheel axle support rod 17. The wheel axle of the wheelchair passes laterally through the middle of the wheel axle support rod 17.

[0033] Furthermore, the main frame 1 also includes an anti-tilt support rod 18, one end of which is connected to the rear support rod 15, and the other end extends downwards and tilts backwards. A roller is installed at the end of the anti-tilt support rod 18.

[0034] In this embodiment, the chair frame structure also includes a backrest support 2, which is formed by combining two rods. The bottom of the backrest support 2 is connected to the main frame 1 via a connecting plate 21. The connecting plate 21 can adjust the tilt angle of the backrest support 2. Specifically, a pivot hole 150 is provided on the upper part of the rear support rod 15, and a positioning hole 130 is provided on the rear part of the upper support rod 13. The top of the connecting plate 21 is fixedly connected to the backrest support 2, and the bottom is rotatably installed in the pivot hole 150. The backrest support 2 can rock back and forth around the pivot hole 150. At the same time, multiple adjustment holes 210 are also provided on the connecting plate 21. By passing a pin 22 through the positioning hole 130 and then through one of the adjustment holes 210, the backrest support 2 can be fixed to prevent rocking. When the pin 22 passes through different adjustment holes 210, the backrest support 2 can be positioned at different angles, thereby realizing the tilt angle adjustment.

[0035] The above description in this specification is merely an illustrative example of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the specific embodiments described or adopt similar methods to replace them, as long as they do not deviate from the content of this specification or exceed the scope defined in the claims, they shall all fall within the protection scope of this invention.

Claims

1. A lightweight wheelchair frame structure, comprising a main frame (1) disposed on both sides of the wheelchair, wherein the main frame (1) is composed of multiple rods spliced ​​together, characterized in that: The rod includes a core material (11) and a cladding layer (12). The cladding layer (12) wraps around the core material (11). The cladding layer (12) and the core material (11) are fixedly connected by an interference fit. The core material (11) is an aluminum profile, and the cladding layer (12) is a thin steel tube. The core material (11) includes a main body (111) located in the middle and a support part (112) located outside the main body (111). The main body (111) has a square structure and a central hole (110) is provided at the center of the main body (111). The support part (112) has four sets and is respectively connected to the four corners of the main body (111).

2. The lightweight wheelchair frame structure according to claim 1, characterized in that: The thickness of the coating layer (12) is 0.3-0.8 mm.

3. The lightweight wheelchair frame structure according to claim 1, characterized in that: The main body (111) has four structural walls with protruding rib structures (113) that extend inward.

4. The lightweight wheelchair frame structure according to claim 3, characterized in that: The support part (112) has a T-shaped structure. The bottom of the support part (112) is connected to the main body part (111) to form a support. The top of the support part (112) extends arcuately to both sides, so that the top of the support part (112) forms an arcuate surface. The core material (11) is tightly attached to the inner side of the covering layer (12) through four arcuate surfaces. An outward-facing cavity is formed between two adjacent sets of support parts (112).

5. The lightweight wheelchair frame structure according to claim 1, characterized in that: The main frame (1) includes an upper support rod (13), a front support rod (14), a rear support rod (15) and a lower support rod (16). The upper support rod (13) and the front support rod (14) are integrally formed, and the rear support rod (15) and the lower support rod (16) are integrally formed. The top end of the rear support rod (15) is connected to the rear part of the upper support rod (13), and the front end of the lower support rod (16) is connected to the lower part of the front support rod (14), thereby forming a frame.

6. The lightweight wheelchair frame structure according to claim 1, characterized in that: The main frame (1) also includes a wheel axle support rod (17) for mounting the rear wheel of the wheelchair. The two ends of the wheel axle support rod (17) are respectively connected between the upper support rod (13) and the lower support rod (16) to form a support. The wheel axle of the wheelchair passes laterally through the middle of the wheel axle support rod (17).

7. The lightweight wheelchair frame structure according to claim 6, characterized in that: The main frame (1) also includes an anti-tilt support rod (18), one end of which is connected to the rear support rod (15), and the other end extends downward at an angle to the rear. A roller is installed at the end of the anti-tilt support rod (18).

8. The lightweight wheelchair frame structure according to claim 7, characterized in that: It also includes a backrest support (2), which is formed by combining two rods. The bottom of the backrest support (2) is connected to the main frame (1) through a connecting plate (21). The upper part of the rear support rod (15) is provided with a pivot hole (150), and the rear part of the upper support rod (13) is provided with a positioning hole (130). The connecting plate (21) is rotatably installed in the pivot hole (150) so that the backrest support (2) can swing back and forth around the pivot hole (150). The connecting plate (21) is also provided with multiple adjustment holes (210). The backrest support (2) is fixed by passing a pin (22) through the positioning hole (130) and then through one of the adjustment holes (210). When the pin (22) passes through different adjustment holes (210), the backrest support (2) can be positioned at different angles.

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