Wheelchair with integrated linkage adjustment

Abstract

The application discloses a wheelchair with integrated linkage adjustment, which comprises a backrest support, a seat support, a wheel support, a foot support and a linkage assembly; the linkage assembly comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod; the wheel support is provided with a first rotating seat; the seat support is rotationally connected with the first rotating seat through a connecting shaft; the wheel support is hinged with the first connecting rod, and the backrest support is fixedly connected with the other end of the first connecting rod; the seat support is fixedly connected with the backrest support; the foot support is rotationally installed on a second rotating seat; the third connecting rod is hinged with the wheel support and the second connecting rod; the fourth connecting rod is fixedly connected with the foot support, and the other end of the fourth connecting rod is hinged with the front end of the second connecting rod. The wheelchair can be transformed between a sitting posture and a lying posture by pushing and pulling a handrail handle, so that the backrest support is rotated to drive the seat support and the foot support to rotate simultaneously, thereby reducing the adjustment process of the wheelchair, reducing the adjustment time of the wheelchair and improving the adjustment efficiency of the wheelchair.

Description

Technical Field

[0001] This invention relates to the field of wheelchair technology, and more particularly to a wheelchair with integrated linkage adjustment. Background Technology

[0002] A wheelchair is a chair equipped with wheels that can help replace walking. It is an important mobility tool for the injured, sick, and disabled to use for home rehabilitation, transportation, medical treatment, and outdoor activities. Wheelchairs not only meet the needs of people with physical disabilities and limited mobility, but more importantly, they facilitate the movement and care of family members, and enable patients to exercise and participate in social activities with the help of wheelchairs.

[0003] In existing technologies, adjustment mechanisms are incorporated into wheelchairs to allow users to change posture and avoid prolonged sitting. These mechanisms adjust the tilt angles of the backrest and footrests, enabling users to shift from a sitting to a reclining position. However, in current wheelchairs, the backrest and footrests are adjusted separately, requiring users to adjust the backrest angle first and then the footrest angle, resulting in low efficiency in adjusting wheelchair posture. Summary of the Invention

[0004] In response to the problems raised in the background art, the purpose of this invention is to propose an integrated and interconnected adjustable wheelchair, which solves the problem of low posture adjustment efficiency in existing wheelchairs.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An integrated, interconnected, and adjustable wheelchair includes a backrest support, a seat frame, wheel frames, footrests, and a linkage assembly. The linkage assembly includes a first connecting rod, a second connecting rod, a third connecting rod, and a fourth connecting rod. A first rotating seat is located at the top of each wheel frame. Symmetrical armrest handles are located at the top of the backrest support. The wheel frames are located on the left and right sides of the seat frame, and the seat frame is connected to the first rotating seat via a connecting shaft, allowing the seat frame to rotate around the first rotating seat between the left and right wheel frames. The rear end of each wheel frame is connected to the first rotating seat. One end of the rod is hinged, and the bottom end of the backrest bracket is fixedly connected to the other end of the first connecting rod; the rear end of the seat frame is fixedly connected to the bottom end of the backrest bracket; the front end of the seat frame is provided with a second rotating seat and a rotatable second connecting rod; the top of the footrest is rotatably mounted on the second rotating seat; the bottom end of the third connecting rod is hinged to the front end of the wheel frame, and the top end of the third connecting rod is hinged to the rear end of the second connecting rod; one end of the fourth connecting rod is fixedly connected to the top of the footrest, and the other end of the fourth connecting rod is hinged to the front end of the second connecting rod.

[0007] More preferably, it also includes a rotation locking assembly, which includes a damping gas spring and a first hand grip; the fixed end of the damping gas spring is fixed to the rear side of the seat frame, and the driving end of the damping gas spring is hinged to the rear side of the wheel frame; the first hand grip is sleeved on the armrest handle, and the first hand grip is connected to the switching valve of the damping gas spring through a pull cable structure.

[0008] Furthermore, it also includes two armrest frames and a hinge rod assembly, with the rear sides of the two armrest frames rotatably connected to the left and right sides of the backrest support, respectively; one end of the hinge rod assembly is fixedly connected to the front end of the armrest frame, and the other end of the hinge rod assembly is hinged to the top of the seat frame.

[0009] Specifically, the hinge rod assembly includes a fixed hinge rod and a hinge sleeve rod; the bottom of the hinge sleeve rod is rotatably connected to the seat frame, the top of the hinge sleeve rod is provided with a locking cavity, and the outside of the hinge sleeve rod is provided with a locking hole communicating with the locking cavity; the top of the fixed hinge rod is fixedly connected to the front end of the handrail frame, and the bottom of the fixed hinge rod is provided with a ball; the ball can be locked in the locking hole by fitting the bottom of the fixed hinge rod into the locking cavity.

[0010] More preferably, it also includes a folding armrest frame, the folding armrest frame comprising a first folding handle, a second folding handle, a first hinge seat, a second hinge seat, and a fixing pin; the hinge ends of the first folding handle and the second folding handle are respectively hinged to the two armrest grips, and the folding ends of the first folding handle and the second folding handle extend along a symmetrical line between the two armrest grips; the first hinge seat is mounted on the folding end of the first folding handle, and the first hinge seat has an L-shaped hinge groove, the bottom of which has a through first lock. The first hinge seat has a first rotating hole at its top that communicates with the hinge groove; the second hinge seat is mounted on the folding end of the second folding handle, and the top of the second hinge seat has a rotating part with a second rotating hole; the second hinge seat has a vertically penetrating second locking hole; the first rotating hole and the second rotating hole are connected in sequence by a rotating shaft, so that the second hinge seat is hinged in the hinge groove and can rotate around the axis of the second rotating hole; the fixing pin is detachably connected to the second locking hole and the first locking hole.

[0011] Furthermore, the folding armrest frame also includes a folding pressing component; the top of the folding pressing component is provided with a mounting groove, and the bottom of the mounting groove is provided with a through third locking hole; one end of the folding pressing component is provided with a pressing plate, one end of the pressing plate is connected to the folding pressing component, and the other end of the pressing plate is outward away from the folding pressing component and bent upward; the top of the fixing pin is provided with a mounting frustum, the diameter of the mounting frustum is larger than the diameter of the third locking hole; the bottom of the fixing pin passes through the mounting groove, the third locking hole, the second locking hole and the first locking hole in sequence, so that the folding pressing component is locked onto the top of the first hinge seat.

[0012] Specifically, the wheel frame includes a swivel caster and a shock-absorbing assembly; the shock-absorbing assembly includes a shock-absorbing spring and a connecting column; the top of the connecting column is fixedly installed on the bottom front side of the wheel frame; the swivel caster is fixed to the bottom of the connecting column; the shock-absorbing spring is sleeved on the outside of the connecting column, the top of the shock-absorbing spring is fixedly connected to the connecting seat, and the bottom of the shock-absorbing spring abuts against the top of the swivel caster.

[0013] More preferably, it also includes a braking assembly, which includes a first brake grip, a second brake lever, and a brake element; the first brake grip is mounted on the two armrest handles, the second brake lever is mounted on the wheel frame, and the first brake grip and the second brake lever are respectively driven connected to the brake element via pipelines.

[0014] Specifically, the footrest includes two swing rods, two telescopic rods, two calf pads, and two foot supports; the top ends of the two swing rods are respectively hinged to the second rotating seat, and the bottom ends of the two swing rods are respectively hinged to the top ends of the two telescopic rods; the two foot supports are respectively installed at the bottom ends of the telescopic rods; and the two calf pads are respectively assembled to the middle of the two swing rods.

[0015] Specifically, the angle A between the support surface of the backrest bracket and the horizontal plane ranges from 107 to 137 degrees; the angle B between the support surface of the seat frame and the horizontal plane ranges from 10 to 15 degrees; the angle C between the support surface of the armrest frame and the horizontal plane ranges from 10 to 15 degrees; and the angle D between the support surface of the footrest frame and the horizontal plane ranges from 111 to 141 degrees.

[0016] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0017] The wheelchair of this application allows medical staff to rotate the backrest support by pushing or pulling the armrest handles, which in turn rotates the seat frame and the footrest frame simultaneously. Only one adjustment is needed to change the wheelchair from a sitting position to a reclining position, or vice versa, reducing the adjustment process and thus reducing the adjustment time and improving the adjustment efficiency of the wheelchair. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a wheelchair according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of a wheelchair according to another embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram illustrating the connection between the backrest support, seat frame, and wheelchair frame according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of a hinge rod assembly according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of a folding handrail frame according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the footrest frame according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the seating posture structure of a wheelchair according to an embodiment of the present invention;

[0025] Figure 8 This is a structural schematic diagram of a wheelchair in a zero-gravity posture according to an embodiment of the present invention. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0028] A preferred embodiment of this application, such as Figures 1 to 8As shown, a wheelchair with integrated linkage adjustment includes a backrest support 1, a seat frame 2, wheel frames 3, footrests 4, and a linkage assembly. The linkage assembly includes a first connecting rod 51, a second connecting rod 52, a third connecting rod 53, and a fourth connecting rod 54. The top of the wheel frame 3 is provided with a first rotating seat 31. The top of the backrest support 1 is provided with symmetrical armrest handles 11. The left and right sides of the seat frame 2 are respectively provided with the wheel frames 3, and the seat frame 2 is connected to the first rotating seat 31 through the connecting shaft, so that the seat frame 2 can rotate around the first rotating seat 31 between the left and right wheel frames 3. The rear end of each wheel frame 3 is connected to the first rotating seat 31. One end of the connecting rod 51 is hinged, and the bottom end of the backrest bracket 1 is fixedly connected to the other end of the first connecting rod 51; the rear end of the seat frame 2 is fixedly connected to the bottom end of the backrest bracket 1; the front end of the seat frame 2 is provided with a second rotating seat 21 and a rotatable second connecting rod 52; the top of the footrest 4 is rotatably mounted on the second rotating seat 21; the bottom end of the third connecting rod 53 is hinged to the front end of the wheel frame 3, and the top end of the third connecting rod 53 is hinged to the rear end of the second connecting rod 52; one end of the fourth connecting rod 54 is fixedly connected to the top of the footrest 4, and the other end of the fourth connecting rod 54 is hinged to the front end of the second connecting rod 52.

[0029] In this embodiment, when it is necessary to change the wheelchair from a sitting position to a lying position, medical personnel can grasp the armrest handle 11 and pull down the backrest support 1, causing the backrest support 1 to rotate counterclockwise via the first connecting rod 51, thereby tilting the backrest support 1 backward. Furthermore, because the rear side of the seat frame 2 is fixedly connected to the bottom of the backrest support 1, when the backrest support 1 rotates counterclockwise, it exerts a downward and backward pulling force on the seat frame 2; and after receiving this pulling force, the entire seat frame 2 can rotate counterclockwise around the first rotating seat 31. Even further, when the seat frame 2 rotates counterclockwise, it can drive the third connecting rod 53 to rotate clockwise via the second connecting rod 52, thus the clockwise rotation of the third connecting rod 53 also pulls the second connecting rod 52 to rotate counterclockwise. The counterclockwise rotation of the second connecting rod 52 will pull the fourth connecting rod 54 to rotate clockwise, causing the fourth connecting rod 54 to pull the footrest 4 to rotate counterclockwise around the second rotating seat 21, thereby causing the bottom of the footrest 4 to rotate upwards, realizing the transformation of the wheelchair from a sitting position to a lying position.

[0030] Similarly, when changing from a lying to a sitting position, the medical staff pulls the armrest handle 11 upwards, causing the backrest support 1 to rotate clockwise. This causes the backrest support 1 to exert an upward pulling force on the rear end of the seat frame 2, thereby causing the seat frame 2 to rotate clockwise around the first rotating seat 31. When the seat frame 2 rotates clockwise, the second connecting rod 52 drives the third connecting rod 53 to rotate counterclockwise, and the counterclockwise rotation of the third connecting rod 53 also pulls the second connecting rod 52 to rotate clockwise. The clockwise rotation of the second connecting rod 52 can pull the fourth connecting rod 54 to rotate counterclockwise, causing the fourth connecting rod 54 to pull the footrest 4 clockwise around the second rotating seat 21, thereby causing the bottom of the footrest 4 to rotate downwards, realizing the transformation of the wheelchair from a lying to a sitting position.

[0031] Therefore, by pushing and pulling the armrest handle 11, medical staff can rotate the backrest support 1, which in turn can drive the seat frame 2 and the footrest frame 4 to rotate simultaneously. Only one adjustment is needed to change the wheelchair from a sitting position to a reclining position, or vice versa, reducing the adjustment process and thus reducing the adjustment time and improving the adjustment efficiency of the wheelchair.

[0032] More preferably, it also includes a rotation locking assembly, which includes a damping gas spring 71 and a first hand grip 72; the fixed end of the damping gas spring 71 is fixed to the rear side of the seat frame 2, and the driving end of the damping gas spring 71 is hinged to the rear side of the wheel frame 3; the first hand grip 72 is sleeved on the armrest handle 11, and the first hand grip 72 is connected to the switching valve of the damping gas spring 71 through a pull wire structure.

[0033] In this embodiment, the wire connection between the first handle 72 and the switching valve is existing technology. Therefore, when it is necessary to change the posture of the wheelchair, medical personnel can grasp the first handle 72 to open the switching valve of the damping gas spring 71, thereby allowing the drive end of the damping gas spring 71 to extend and retract. After grasping the first handle 72, pulling the armrest handle 11 causes the backrest support 1 to rotate, which in turn drives the seat frame 2 and footrest 4 to rotate, allowing the wheelchair to switch between sitting and reclining positions. After the posture change is completed, releasing the first handle 72 closes the switching valve of the damping gas spring 71, locking the drive end of the damping gas spring 71 and preventing it from extending or retracting, thus preventing the seat frame 2 from rotating around the first rotating seat 31. Therefore, when a user leans against the backrest support 1 or a medical professional pushes or pulls the armrest handle 11, the seat frame 2 is locked by the damping gas spring 71 and cannot rotate. Consequently, the backrest support 1, fixedly connected to the seat frame 2, also cannot rotate, thus locking the tilt angle of the backrest support 1. Similarly, when the seat frame 2 is locked by the damping gas spring 71, the second connecting rod 52 is also locked from rotating. Thus, the seat frame 2 can tighten the fourth connecting rod 54 via the second connecting rod 52, thereby tightening the footrest 4 and preventing it from rotating. Therefore, when changing the wheelchair posture, the user can grasp the first hand grip 72, causing the damping gas spring 71 to unlock the seat frame 2. Pulling the backrest support 1 then rotates the seat frame 2 and the footrest 4, achieving a posture change. After the posture change is complete, the damping gas spring 71 locks the seat frame 2, preventing the backrest support 1 and the footrest 4 from rotating, thus locking the adjusted wheelchair posture. More preferably, when the damping gas spring 71 is used to lock the rotation of the seat frame 2, it can also reduce the buffering when the backrest support 1 rotates counterclockwise, ensuring the smooth adjustment of the wheelchair; and when changing from a reclining position to a sitting position, after opening the switch valve of the damping gas spring 71, the backrest support 1 can be supported to rotate clockwise under the elastic action of the damping gas spring 71, so that hospital staff can easily push the backrest support 1, reducing the labor intensity of medical staff.

[0034] Furthermore, it also includes two armrest frames 6 and a hinge rod assembly 60. The rear sides of the two armrest frames 6 are rotatably connected to the left and right sides of the backrest support 1, respectively. One end of the hinge rod assembly 60 is fixedly connected to the front end of the armrest frame 6, and the other end of the hinge rod assembly 60 is hinged to the top of the seat frame 2.

[0035] Wheelchairs typically have handrails for comfortable hand placement. However, existing handrails remain fixed when the wheelchair is in a reclining position, resulting in a large angle between the user's body and the handrail after the wheelchair is adjusted, making it inconvenient to place the hands. Therefore, in this embodiment, the handrail is rotatably connected to the backrest support 1, so that the rotation of the backrest support 1 can move the handrail. Furthermore, the front end of the handrail is hinged to the seat frame 2 via the hinge rod assembly 60. Thus, when the handrail is moved by the backrest support 1, it rotates in the same direction as the backrest support 1 via the hinge rod assembly 60, preventing an excessive angle between the handrail and the backrest seat and ensuring comfortable hand placement for the user.

[0036] Specifically, the hinge rod assembly 60 includes a fixed hinge rod 61 and a hinge sleeve rod 62. The bottom of the hinge sleeve rod 62 is rotatably connected to the seat frame 2, and the top of the hinge sleeve rod 62 is provided with a locking cavity 621. The outside of the hinge sleeve rod 62 is provided with a locking hole 622 communicating with the locking cavity 621. The top of the fixed hinge rod 61 is fixedly connected to the front end of the armrest frame 6, and the bottom of the fixed hinge rod 61 is provided with a ball bearing 611. The ball bearing 611 can be locked into the locking hole 622 by fitting the bottom of the fixed hinge rod 61 into the locking cavity 621. The bottom end of the hinge sleeve rod 62 is hinged to the seat frame 2 and can swing under the action of external force. The top end of the fixed hinge rod 61 is fixedly connected to the handguard frame, while the bottom end of the fixed hinge rod 61 is inserted into the locking cavity 621, so that the handguard frame is hinged to the seat frame 2, allowing the handguard frame to rotate clockwise or counterclockwise. More preferably, the bottom of the fixed hinge rod 61 is also provided with a ball bearing 611. Through the locking action between the ball bearing 611 and the locking hole 622, the fixed hinge rod 61 is securely inserted into the locking cavity 621, preventing the fixed hinge rod 61 from disconnecting from the hinge sleeve rod 62 when the handguard frame rotates, thus ensuring the hinge between the handguard frame and the seat frame 2. When it is necessary to lift the wheelchair user from the side of the wheelchair, the ball bearing 611 can be pressed, and then the fixed hinge rod 61 can be pulled out. This causes the fixed hinge rod 61 to lose its hinge with the hinge sleeve rod 62, thereby causing the handguard frame to lose its hinge with the seat frame 2. After disconnecting the hinge between the fixed hinge rod 61 and the hinge sleeve rod 62, the handrail is driven to rotate around the connection point between it and the backrest support 1, so that the handrail is upright, making it easier to lift the user off the wheelchair from the side.

[0037] More preferably, it also includes a folding armrest frame 8, which includes a first folding handle 81, a second folding handle 82, a first hinge seat 83, a second hinge seat 84, and a fixing pin 85; the hinge ends of the first folding handle 81 and the second folding handle 82 are respectively hinged to the two armrest grips 11, and the folding ends of the first folding handle 81 and the second folding handle 82 extend along a symmetrical line between the two armrest grips 11; the first hinge seat 83 is installed on the folding end of the first folding handle 81, and the first hinge seat 83 has an L-shaped hinge groove 831, the bottom of which has a through first locking hole; The first hinge seat 83 has a first rotating hole 832 at its top that communicates with the hinge groove 831; the second hinge seat 84 is mounted on the folding end of the second folding handle 82, and the top of the second hinge seat 84 has a rotating part with a second rotating hole 841; the second hinge seat 84 has a vertically penetrating second locking hole 842; the first rotating hole 832 and the second rotating hole 841 are connected in sequence by a rotating shaft, so that the second hinge seat 84 is hinged in the hinge groove 831, and the second hinge seat 84 can rotate around the axis of the second rotating hole 841; the fixing pin 85 is detachably connected to the second locking hole 842 and the first locking hole.

[0038] In this embodiment, the folding armrest 8 provides a gripping space for the wheelchair pusher, allowing for better pushing and pulling of the wheelchair. The seat frame 2 in this embodiment has an existing folding structure at its bottom, which allows the backrest support 1 and the seat frame 2 to fold or open symmetrically from left to right. Therefore, to allow the folding armrest 8 to fold along with the seat frame 2 and the backrest support 1, a first hinge seat 83 and a second hinge seat 84 are respectively provided between the first folding handle 81 and the second folding handle 82. The second hinge seat 84 is connected to the first rotating hole 832 of the first hinge seat 83 via a pivot, allowing the second hinge seat 84 to rotate within the hinge groove 831. This allows the first folding handle 81 and the second folding handle 82 to move closer or further apart, thus enabling the folding or opening of the folding armrest 8. More preferably, to lock the folding armrest frame 8 in its open position, the fixing pin 85 can be sequentially connected to the second locking hole 842 and the first locking hole, preventing the second hinge seat 84 from rotating within the hinge groove 831, thus preventing the folding armrest frame 8 from folding and ensuring its open position. When it is necessary to fold the folding armrest frame 8, simply pull out the fixing pin 85, and the second hinge seat 84 can rotate within the hinge groove 831, thereby folding.

[0039] Specifically, the folding armrest frame 8 further includes a folding pressing member 86; the top of the folding pressing member 86 is provided with a mounting groove 860, and the bottom of the mounting groove 860 is provided with a through third locking hole; one end of the folding pressing member 86 is provided with a pressing plate 861, one end of the pressing plate 861 is connected to the folding pressing member 86, and the other end of the pressing plate 861 is outward away from the folding pressing member 86 and bent upward; the top of the fixing pin 85 is provided with a mounting frustum 851, the diameter of the mounting frustum 851 is larger than the diameter of the third locking hole; the bottom of the fixing pin 85 passes through the mounting groove 860, the third locking hole, the second locking hole 842 and the first locking hole in sequence, so that the folding pressing member 86 is snapped onto the top of the first hinge seat 83.

[0040] In this embodiment, to facilitate the removal of the fixing pin 85, the folding armrest frame 8 is further provided with a folding pressing member 86. The top of the folding pressing member 86 is provided with a mounting slot 860, and the mounting slot 860 is provided with a through third locking hole. Therefore, when the folding armrest frame 8 is fixed open, the bottom of the fixing pin 85 passes through the mounting slot 860, the third locking hole, the second locking hole 842, and the first locking hole in sequence, making it impossible for the second hinge seat 84 to lock. At this time, the locking frustum 851 at the top of the fixing pin 85 is engaged in the mounting slot 860. This arrangement prevents the fixing pin 85 from falling out of the mounting slot 860, the third locking hole, the second locking hole 842, and the first locking hole, thereby causing the second hinge seat 84 to lose the engagement of the fixing pin 85, allowing the second hinge seat 84 to rotate within the hinge groove 831. When folding is required, the pressing plate 861 of the folding pressing member 86 can be pressed down. The pressing plate 861 moves downward, causing the entire folding pressing member 86 to tilt upward at the top of the second hinge seat 84. The tilting upward of the folding pressing member 86 causes the fixing pin 85 to move upward, causing the bottom rod of the fixing pin 85 to disengage from the first locking hole, thereby allowing the second hinge seat 84 to resume rotation and fold.

[0041] Specifically, the wheel frame 3 includes swivel casters 32 and a shock-absorbing assembly; the shock-absorbing assembly includes a mounting bracket, a shock-absorbing spring 34, and a connecting seat; the connecting seat is fixedly installed on the bottom front side of the wheel frame 3, and a connecting post 33 is provided at the bottom of the connecting seat; the shock-absorbing spring 34 is sleeved on the outside of the connecting post 33, and the top of the shock-absorbing spring 34 is fixedly connected to the connecting seat; the top of the mounting bracket is provided with a connecting hole, which is connected to the connecting post 33, so that the mounting bracket is installed at the bottom of the connecting seat, and the bottom of the shock-absorbing spring 34 abuts against the top of the mounting bracket; the swivel casters 32 are installed on the mounting bracket.

[0042] In this embodiment, the omnidirectional wheelchair enables omnidirectional steering, adapting to use in confined spaces and providing users with greater convenience. Furthermore, a shock-absorbing spring 34 is provided between the omnidirectional wheel and the wheel frame 3, reducing vibration during wheelchair movement and thus minimizing the user's sense of jolts and improving comfort.

[0043] More preferably, it also includes a braking assembly, which includes a first brake grip 91, a second brake handle 92, and a brake element 93. The first brake grip 91 is mounted on the two armrest handles 11, and the second brake handle 92 is mounted on the wheel frame 3. The first brake grip 91 and the second brake handle are respectively driven connected to the brake element 93 via pipelines. In this embodiment, the brake element 93 is a commonly used braking structure for wheelchairs, and the driving connection of the pipelines between the first brake grip 91 and the second brake handle and the brake element 93 is also a conventional wheelchair braking function. The first brake grip 91 is fitted onto the armrest handles 11, making it convenient for medical personnel to brake when pushing the wheelchair. The second brake handle is set on the wheelchair frame, making it convenient for the user to pull when moving the wheelchair, thereby allowing the wheelchair to stop quickly.

[0044] Specifically, the footrest 4 includes two swing rods 41, two telescopic rods 42, two calf pads 43, and two foot supports 44. The top ends of the two swing rods 41 are respectively hinged to the second rotating seat 21, and the bottom ends of the two swing rods 41 are respectively hinged to the top ends of the two telescopic rods 42. The two foot supports 44 are respectively installed at the bottom ends of the telescopic rods 42. The two calf pads 43 are respectively assembled to the middle of the two swing rods 41. The footrest 4 is hinged to the two second rotating seats 21 at the front end of the seat frame 2 via the two swing rods 41, so that the swing rods 41 can rotate around the second swing seats, thereby adjusting the tilt angle of the footrest 4. Furthermore, calf pads 43 are also provided in the middle of the two swing rods 41, which can support the lower legs of the user and increase the user's comfort. Furthermore, a foot support 44 is provided at the bottom of the swing arm 41 to support the user's feet. The foot support 44 can be adjusted by the telescopic rod 42 to meet the needs of users of different heights.

[0045] Preferably, the angle A between the supporting surface of the backrest bracket and the horizontal plane ranges from 107 to 137 degrees; the angle B between the supporting surface of the seat frame and the horizontal plane ranges from 10 to 15 degrees; the angle C between the supporting surface of the armrest frame and the horizontal plane ranges from 10 to 15 degrees; and the angle D between the supporting surface of the footrest frame and the horizontal plane ranges from 111 to 141 degrees. In this embodiment, the backrest bracket 1 can be pushed and pulled, allowing the wheelchair to freely switch between sitting and reclining positions, preventing the user from remaining in the same posture for extended periods. Different users have different preferred reclining angles. Therefore, the backrest bracket 1, armrest frame 6, seat frame 2, and footrest frame 4 can be adjusted within a certain range to accommodate different reclining angles. Furthermore, when the backrest support 1 of the wheelchair is set to 107 degrees, the tilt angles of the seat frame 2 and armrest frame 6 are both 10 degrees, and the tilt angle of the footrest 4 is 111 degrees. This allows the wheelchair to adopt a slightly backward-tilted sitting posture, enabling the user's shoulders and back to rest flat against the backrest support 1, preventing the user from leaning forward and bending due to prolonged sitting. Even further, when the backrest support 1 is fully pulled down, it will be at 137 degrees, the seat frame 2 and armrest frame 6 at 15 degrees, and the footrest 4 at 141 degrees, placing the user in a zero-gravity sitting posture. This allows the user to experience the comfort of weightlessness, naturally relaxing the spine, reducing pressure on internal organs, promoting blood circulation in the legs, relaxing the limbs, increasing blood circulation, and promoting metabolism. This effectively relieves lower limb fatigue for users who sit for long periods.

[0046] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A wheelchair with integrated linkage adjustment, characterized in that, Includes backrest support, seat frame, wheel frame, footrest, and linkage components; The linkage component includes a first connecting rod, a second connecting rod, a third connecting rod, and a fourth connecting rod; The top of the wheel frame is provided with a first rotating seat; The top of the backrest support is equipped with symmetrical armrests. The seat frame is provided with wheel frames on the left and right sides respectively, and the seat frame is movably connected to the first rotating seat through a connecting shaft, so that the seat frame can rotate around the connecting shaft between the wheel frames on the left and right sides. The rear end of each wheel frame is hinged to one end of the first connecting rod, and the bottom end of the backrest bracket is fixedly connected to the other end of the first connecting rod; the rear end of the seat frame is fixedly connected to the bottom end of the backrest bracket. The front end of the frame is provided with a second rotating seat and a rotatable second connecting rod; The top of the footrest is rotatably mounted on the second rotating seat; The bottom end of the third connecting rod is hinged to the front end of the wheel frame, and the top end of the third connecting rod is hinged to the rear end of the second connecting rod. One end of the fourth connecting rod is fixedly connected to the top of the footrest, and the other end of the fourth connecting rod is hinged to the front end of the second connecting rod; It also includes a rotation locking assembly, which comprises a damping gas spring and a first hand grip; The fixed end of the damping gas spring is fixed to the rear side of the seat frame, and the driving end of the damping gas spring is hinged to the rear side of the wheel frame. The first hand grip is fitted onto the armrest handle, and the first hand grip is connected to the switching valve of the damping gas spring via a pull cable structure; It also includes two armrest frames and hinge rod assemblies, with the rear sides of the two armrest frames rotatably connected to the left and right sides of the backrest support, respectively. One end of the hinge rod assembly is fixedly connected to the front end of the handrail frame, and the other end of the hinge rod assembly is hinged to the top of the seat frame.

2. The wheelchair with integrated linkage adjustment according to claim 1, characterized in that, The hinge rod assembly includes a fixed hinge rod and a hinge sleeve rod; The bottom of the hinged sleeve is rotatably connected to the base frame, the top of the hinged sleeve is provided with a locking cavity, and the outside of the hinged sleeve is provided with a locking hole communicating with the locking cavity; The top of the fixed hinge rod is fixedly connected to the front end of the handrail frame, and the bottom of the fixed hinge rod is provided with a ball bearing. The ball can be secured in the mounting hole by fitting the bottom of the fixed hinge rod into the mounting cavity.

3. The wheelchair with integrated linkage adjustment according to claim 1, characterized in that, It also includes a folding handrail frame, which includes a first folding handle, a second folding handle, a first hinge seat, a second hinge seat, and a fixing pin; The hinged ends of the first folding handle and the second folding handle are respectively hinged to the two armrest handles, and the folding ends of the first folding handle and the second folding handle extend towards the line of symmetry between the two armrest handles. The first hinge seat is installed on the folding end of the first folding handle. The first hinge seat has an L-shaped hinge groove, and the bottom of the hinge groove has a through first locking hole. The top of the first hinge seat has a first rotating hole that communicates with the hinge groove. The second hinge seat is installed on the folding end of the second folding handle. The top of the second hinge seat is provided with a rotating part, and the rotating part is provided with a second rotating hole. The second hinge seat is provided with a vertically penetrating second locking hole. The first rotating hole and the second rotating hole are connected in sequence by a rotating shaft, so that the second hinge seat is hinged in the hinge groove, and the second hinge seat can rotate about the axis of the second rotating hole. The fixing pin is detachably connected to the second locking hole and the first locking hole.

4. The wheelchair with integrated linkage adjustment according to claim 3, characterized in that, The folding armrest frame also includes a folding pressing component; The top of the folding pressing component is provided with a mounting slot, and the bottom of the mounting slot is provided with a through third locking hole; One end of the folding pressing member is provided with a pressing plate, one end of the pressing plate is connected to the folding pressing member, and the other end of the pressing plate is outward away from the folding pressing member and bent upward; The top of the fixing pin is provided with a locking frustum, the diameter of which is larger than the diameter of the third locking hole; The bottom of the fixing pin passes through the mounting slot, the third locking hole, the second locking hole and the first locking hole in sequence, so that the folding pressing member is snapped into the top of the first hinge seat.

5. The wheelchair with integrated linkage adjustment according to claim 1, characterized in that, The wheel frame includes swivel casters and shock absorption components; The damping assembly includes a damping spring and a connecting column; The top of the connecting column is fixedly installed to the bottom front side of the wheel frame; the swivel caster is fixed to the bottom of the connecting column; The shock-absorbing spring is sleeved on the outside of the connecting column, the top of the shock-absorbing spring is fixedly connected to the connecting column, and the bottom of the shock-absorbing spring abuts against the top of the swivel caster.

6. The wheelchair with integrated linkage adjustment according to claim 1, characterized in that, It also includes a brake assembly, which includes a first brake lever, a second brake handle, and a brake element; The first brake grip is mounted on the two armrest handles, the second brake lever is mounted on the wheel frame, and the first brake grip and the second brake lever are respectively connected to the brake components via pipelines.

7. The wheelchair with integrated linkage adjustment according to claim 1, characterized in that, The footrest includes two swing rods, two telescopic rods, two calf pads, and two foot supports; The top ends of the two swing rods are respectively hinged to the second rotating seat, and the bottom ends of the two swing rods are respectively hinged to the top ends of the two telescopic rods; The two support legs are respectively installed at the bottom end of the telescopic rod; The two calf pads are respectively fitted to the middle of the two swing rods.

8. The wheelchair with integrated linkage adjustment according to claim 1, characterized in that, The angle A between the support surface of the backrest bracket and the horizontal plane ranges from 107 to 137 degrees. The angle B between the support surface of the frame and the horizontal plane is in the range of 10-15 degrees; The angle C between the support surface of the handrail and the horizontal plane is in the range of 10-15 degrees; The angle D between the support surface of the footrest and the horizontal plane ranges from 111 to 141 degrees.

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