Impact-resistant wheelchair

Abstract

The utility model provides a kind of impact resistance wheelchair, including chair frame, and chair frame is equipped with seat area and footboard area, and the bottom of chair frame is equipped with main wheel and trundle respectively, and main wheel and trundle are separately arranged at the bottom of chair frame four corners. The seat area of chair frame is provided with brake mechanism. The side of chair frame away from trundle is provided with anti-overturning mechanism, and anti-overturning mechanism and brake mechanism are drivingly connected. Anti-overturning mechanism includes brake plate and transmission assembly, and brake plate is rotatably connected to chair frame by pin shaft. Transmission assembly is connected between brake mechanism and brake plate, and the end of brake plate away from transmission mechanism is arranged towards ground and keeps a distance from ground. The utility model can prevent wheelchair from overturning, support and brake wheelchair, and protect the personal safety of user.

Description

Technical Field

[0001] This utility model belongs to the field of wheelchair technology, specifically relating to an impact-resistant wheelchair. Background Technology

[0002] As the primary mode of transportation for people with mobility impairments, the safety and convenience of wheelchairs are paramount. Lightweight, foldable, and portable wheelchairs are particularly prevalent. However, portable wheelchairs suffer from poor impact resistance and are prone to tipping backward. When a wheelchair suddenly accelerates or brakes suddenly, the user's center of gravity shifts backward. Because the axle of the large wheels in traditional portable wheelchairs is relatively forward, when the center of gravity shifts backward beyond the fulcrum, a torque is generated that causes the wheelchair to tip backward around the large wheel as its axis. This sudden tipping can easily cause the user's head and back to hit the ground, resulting in serious secondary injuries and greatly threatening the user's personal safety. To solve this tipping problem, the most common method in existing technology is to add a small anti-tipping wheel at the rear of the wheelchair frame. When the wheelchair is about to tip backward, this anti-tipping wheel prevents it from tipping over, providing safety protection. However, the anti-tipping wheel generates additional rolling resistance during normal wheelchair movement, making the wheelchair cumbersome and difficult to push.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides an impact-resistant wheelchair, which solves the defects of traditional portable wheelchairs that have poor impact resistance and are prone to tipping over, enhances the frontal impact resistance of the wheelchair, and has a simple overall structure and is easy to operate.

[0005] Technical Solution: To achieve the above objectives, this utility model provides an impact-resistant wheelchair, including a frame with a seating area and a footrest area. Main wheels and casters are installed on both sides of the bottom of the frame, located at the four corners of the bottom. A braking mechanism is provided in the seating area. An anti-tipping mechanism is provided on the side of the frame away from the casters, and the anti-tipping mechanism and the braking mechanism are connected by a transmission. The anti-tipping mechanism includes a brake plate and a transmission assembly. The brake plate is rotatably connected to the frame via a pin. The transmission assembly is connected between the braking mechanism and the brake plate. The end of the brake plate away from the transmission mechanism is positioned towards the ground and maintains a distance from the ground. This utility model serves as a mobility aid for people with mobility impairments. The user can sit in the seating area and place their feet in the footrest area. During operation, if the center of gravity shifts backward, the frame rotates around the main wheel axis, and the brake plate abuts against the bottom surface, providing support. Simultaneously, the brake plate, through the transmission assembly, drives the braking mechanism to brake the main wheels, preventing the wheelchair from tipping over and protecting the user's safety.

[0006] Furthermore, in the aforementioned impact-resistant wheelchair, the braking mechanism includes a housing connected to the chair frame. A brake plate and a brake lever are movably connected to the housing shaft, and the brake plate and brake lever are connected via a connecting plate. During braking, the brake lever pushes the braking part of the brake plate into contact with the main wheel. When braking is required, rotating the brake lever causes the lower end of the brake lever to rotate, thereby squeezing the brake plate and causing it to rotate towards the main wheel until the brake plate is tightly fitted against the outer circumference of the main wheel. When not braking, operating the brake lever in the opposite direction pulls the brake plate back to its original position via the connecting plate, disengaging the brake plate from the main wheel and ensuring normal operation. The above structure is simple and easy to operate.

[0007] Furthermore, in the aforementioned impact-resistant wheelchair, the transmission assembly includes a gear mechanism and a transmission rod, the brake plate is connected to the transmission rod and the gear mechanism via a transmission connection, and the gear mechanism and the brake plate are connected to a drive connection.

[0008] Furthermore, in the aforementioned impact-resistant wheelchair, the brake plate is L-shaped, comprising a horizontal section and a vertical section, with the vertical section bent downwards from the horizontal section. A pin is rotatably connected to the side of the horizontal section closest to the vertical section. The axis of the pin is parallel to the axis of the main wheel. During normal operation, the bottom end of the vertical section maintains a distance from the ground to avoid contact with the ground and generating additional resistance. When the wheelchair's center of gravity shifts backward due to sudden acceleration or emergency braking, the chair frame rotates around the axis of the main wheel, and the bottom end of the vertical section contacts the ground first. The reaction force from the ground pushes the vertical section, causing the horizontal section to rotate downwards around the pin, thereby triggering the linkage of the transmission components. The eccentrically positioned pin acts as a lever, improving braking sensitivity and braking force.

[0009] Furthermore, in the aforementioned impact-resistant wheelchair, the horizontal section and one end of the transmission rod are provided with a slot. The slot faces upward and opens towards the transmission rod, allowing the transmission rod to be rotatably connected within the slot. When the brake plate rotates, the slot can adapt to changes in the angle of the transmission rod, ensuring smooth transmission.

[0010] Furthermore, in the aforementioned impact-resistant wheelchair, the gear mechanism includes a housing containing a meshing first gear and a second gear. The first gear and the brake plate are coaxially and synchronously connected, and a transmission rod is rotatably connected to the second gear on the side away from the first gear. When the brake plate is subjected to force and rotates, it drives the second gear to rotate via the transmission rod. The second gear then drives the first gear to rotate, thereby driving the brake plate to achieve braking, forming a linkage mechanism for anti-tipping and braking. Simultaneously, the first and second gears can be configured with an appropriate gear ratio to improve braking sensitivity.

[0011] Furthermore, in the aforementioned impact-resistant wheelchair, the footrest area of ​​the chair frame is equipped with a crash bar, which is curved in shape. The crash bar is a steel rod wrapped with elastic rubber. The curved design of the crash bar can disperse the force of a frontal impact. When the footrest area is hit by a collision, the rubber layer absorbs the impact energy, and the steel rod provides structural protection, effectively protecting the user's feet from injury. As can be seen from the above technical solution, this utility model has the following beneficial effects: This impact-resistant wheelchair, through the linkage design of the anti-tipping mechanism and the braking mechanism, solves the defects of traditional portable wheelchairs, such as poor impact resistance and easy tipping over. The anti-tipping mechanism does not affect the wheelchair's portability and is suitable for foldable lightweight wheelchairs. When it is about to tip over, the brake plate first contacts the ground to prevent tipping, and at the same time, the transmission component automatically triggers the braking mechanism to brake the main wheels, providing double protection for the user and ensuring their personal safety. The arc-shaped anti-collision bar enhances frontal impact resistance. This utility model has a simple overall structure and is easy to operate, making it suitable for daily use by people with mobility impairments. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the impact-resistant wheelchair of this utility model; Figure 2 As shown Figure 1 A magnified view of a portion of the image; Figure 3 As shown Figure 1 A magnified view of a portion of the image; Figure 4 This is a cross-sectional view of the impact-resistant wheelchair of this utility model; Figure 5 This is a schematic diagram of the structure of the transmission assembly; Figure 6 As shown Figure 4 A magnified view of a portion of the image.

[0013] In the diagram: 1. Chair frame, 11. Seating area, 12. Footrest area, 13. Anti-collision bar, 2. Main wheel, 3. Caster, 4. Braking mechanism, 41. Housing, 42. Brake plate, 421. Braking part, 43. Brake lever, 44. Connecting plate, 5. Anti-tipping mechanism, 51. Brake plate, 511. Pin, 512. Horizontal section, 513. Vertical section, 5111. Groove, 52. Gear mechanism, 521. First gear, 522. Second gear, 53. Transmission rod. Detailed Implementation

[0014] Example 1 like Figure 1-2The illustrated impact-resistant wheelchair includes a frame 1, which has a seating area 11 and a footrest area 12. Main wheels 2 and casters 3 are respectively installed on both sides of the bottom of the frame 1, located at the four corners of the bottom. A braking mechanism 4 is installed in the seating area 11 of the frame 1. An anti-tipping mechanism 5 is located on the side of the frame 1 away from the casters 3, and the anti-tipping mechanism 5 is kinetically connected to the braking mechanism 4. The anti-tipping mechanism 5 includes a brake plate 51 and a transmission assembly. The brake plate 51 is rotatably connected to the frame 1 via a pin 511. The transmission assembly is connected between the braking mechanism 4 and the brake plate 51. The end of the brake plate 51 away from the transmission mechanism is positioned towards the ground and maintains a distance of 5-7 cm from the ground. like Figure 3 The shock-resistant wheelchair shown includes a braking mechanism 4 comprising a housing 41 connected to the seat frame 1. A brake plate 42 and a brake lever 43 are movably connected to the housing 41 via a shaft. The brake plate 42 and brake lever 43 are connected by a connecting plate 44. During braking, the brake lever 43 pushes the braking part 421 of the brake plate 42 into contact with the main wheel 2. When braking is required, rotating the brake lever 43 causes its lower end to rotate and press against the brake plate 42, causing the brake plate 42 to rotate towards the main wheel 2 until it is in close contact with the outer circumferential surface of the main wheel 2. When not braking, operating the brake lever 43 in the opposite direction pulls the brake plate 42 back to its original position via the connecting plate 44, disengaging the brake plate 42 from the main wheel 2 and ensuring normal operation. The outer circumference of the braking part 421 is fitted with a high-friction coefficient rubber sleeve. The surface of the rubber sleeve has evenly distributed oblique anti-slip textures, effectively increasing the contact friction with the outer circumferential surface of the main wheel 2 and improving the stability and reliability of braking.

[0015] like Figure 4 The shock-resistant wheelchair shown has a transmission assembly including a gear mechanism 52 and a transmission rod 53. The brake plate 51 is connected to the gear mechanism 52 via the transmission rod 53, and the gear mechanism 52 is connected to the brake plate 42 via a drive connection.

[0016] In this embodiment, the brake plate 51 is L-shaped, comprising a horizontal section 512 and a vertical section 513, with the vertical section 513 bent downwards from the horizontal section 512. A pin 511 is rotatably connected to the side of the horizontal section 512 near the vertical section 513. The axis of the pin 511 is parallel to the axis of the main wheel 2. During normal operation, the bottom end of the vertical section 513 maintains a distance from the ground to avoid contact with the ground and generating additional resistance. When the wheelchair's center of gravity shifts backward due to sudden acceleration or emergency braking, the chair frame 1 rotates around the axis of the main wheel 2, and the bottom end of the vertical section 513 contacts the ground first. The reaction force from the ground pushes the vertical section 513 to drive the horizontal section 512 to rotate downwards around the pin 511, thereby triggering the linkage of the transmission components. The eccentrically positioned pin 511 acts as a lever, improving the braking sensitivity and braking force.

[0017] like Figure 5 The impact-resistant wheelchair shown has a slot 5111 at one end of the horizontal section 512 and the transmission rod 53. The slot 5111 opens upwards and toward the transmission rod 53, and the transmission rod 53 is rotatably connected to the slot 5111. When the brake plate 51 rotates, the slot 5111 can adapt to the angle change of the transmission rod 53 to ensure smooth transmission. The slot 5111 provides support to ensure braking stability.

[0018] like Figure 6 The shock-resistant wheelchair shown includes a gear mechanism 52 comprising a housing containing a first gear 521 and a second gear 522 meshing with each other. The first gear 521 and a brake plate 42 are coaxially and synchronously connected. A transmission rod 53 is rotatably connected to the side of the second gear 522 away from the first gear 521. When the brake plate 51 is rotated under force, the transmission rod 53 drives the second gear 522 to rotate, which in turn drives the first gear 521 to rotate, thereby driving the brake plate 42 to achieve braking, forming a linkage mechanism for anti-tipping and braking. The gear ratio of the first gear 521 and the second gear 522 is preferably 1:1.5 or 1:2.

[0019] In this embodiment, the footrest area 12 of the chair frame 1 is provided with a crash bar 13, which is curved. The crash bar 13 is a steel bar wrapped with elastic rubber.

[0020] The working process of this utility model is as follows: When the center of gravity of the wheelchair shifts backward during the movement of the wheelchair, the chair frame 1 flips backward around the axis of the main wheel 2. The vertical section 513 of the brake plate 51 first contacts the ground. The vertical section 513 is subjected to the reaction force of the ground, which pushes the horizontal section 512 to rotate downward around the pin 511. The horizontal section 512 pulls the transmission rod 53 to move downward. The transmission rod 53 drives the second gear 522 to rotate. The second gear 522 meshes and drives the first gear 521 to rotate, which in turn drives the braking part 421 of the brake plate 42 to contact the main wheel 2 to achieve braking. At the same time, because the braking part 421 is in contact with the main wheel 2 and no longer rotates, the brake plate 51 stops rotating. The vertical section 513 of the brake plate 51 provides support force to prevent the wheelchair from continuing to tip backward. The whole process is smooth and coordinated, achieving braking while preventing tipping and protecting the user's safety.

[0021] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. An impact-resistant wheelchair, characterized in that: The chair includes a chair frame (1), which has a seating area (11) and a footrest area (12). The chair frame (1) has main wheels (2) and casters (3) installed on both sides of its bottom. The main wheels (2) and casters (3) are located at the four corners of the bottom of the chair frame (1). A brake mechanism (4) is provided at the seating area (11) of the chair frame (1). An anti-tipping mechanism (5) is provided on the side of the chair frame (1) away from the casters (3). The anti-tipping mechanism (5) and the brake mechanism (4) are connected by transmission. The anti-tipping mechanism (5) includes a brake plate (51) and a transmission assembly. The brake plate (51) is rotatably connected to the chair frame (1) through a pin (511). The transmission assembly is connected between the brake mechanism (4) and the brake plate (51). The brake plate (51) is set towards the ground at the end away from the transmission mechanism and maintains a distance from the ground.

2. The impact-resistant wheelchair according to claim 1, characterized in that: The braking mechanism (4) includes a housing (41) connected to the chair frame (1). The housing (41) is movably connected to a brake plate (42) and a brake lever (43). The brake plate (42) and the brake lever (43) are connected by a connecting plate (44). When braking, the brake lever (43) pushes the braking part (421) provided on the brake plate (42) to contact the main wheel (2).

3. The impact-resistant wheelchair according to claim 2, characterized in that: The transmission assembly includes a gear mechanism (52) and a transmission rod (53). The brake plate (51) is connected to the gear mechanism (52) via the transmission rod (53). The gear mechanism (52) and the brake plate (42) are connected in a driving manner.

4. The impact-resistant wheelchair according to claim 3, characterized in that: The brake plate (51) is L-shaped and includes a horizontal section (512) and a vertical section (513). The vertical section (513) is bent downward from the horizontal section (512). The pin (511) is rotatably connected to the side of the horizontal section (512) near the vertical section (513).

5. The impact-resistant wheelchair according to claim 4, characterized in that: The horizontal section (512) and the transmission rod (53) are provided with a slot (5111) at one end. The slot (5111) is upward and opens to the side of the transmission rod (53). The transmission rod (53) is rotatably connected to the slot (5111).

6. The impact-resistant wheelchair according to claim 3, characterized in that: The gear mechanism (52) includes a housing, in which a first gear (521) and a second gear (522) mesh with each other. The first gear (521) and the brake plate (42) are coaxially and synchronously connected. The transmission rod (53) is rotatably connected to the side of the second gear (522) away from the first gear (521).

7. The impact-resistant wheelchair according to claim 1, characterized in that: The footrest area (12) of the chair frame (1) is provided with a crash bar (13), and the crash bar (13) is curved.

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