An adjustable wheelchair with Mecanum wheels for stable movement

Abstract

The present invention relates to an adjustable wheelchair that can be stably moved based on Mecanum wheels. An adjustable wheelchair that can be stably moved based on Mecanum wheels, the adjustable wheelchair comprises a base, a seat cushion, a seat back and armrests, the base is used to connect the wheels, the seat cushion is connected to the base through an adjustment component for supporting the weight of the user, the adjustable wheelchair is provided with an adjustment component in a manner that can be adapted to the use of different users, the adjustment component comprises an adjustable component 1 for adjusting the seat height. The adjustable component 1 comprises a first bracket and a second bracket that are arranged crosswise with each other, when the user sits on the wheelchair, the adjustable component 1 is arranged in an arc shape in a manner that can raise the height of the seat by changing the height of one end of the first bracket close to the base and while keeping the seat horizontal and the distance between the first bracket and the second bracket close to the seat cushion unchanged.

Description

Technical Field

[0001] The invention relates to the technical field of rehabilitation auxiliary equipment, and in particular to an adjustable wheelchair with Mecanum wheels for stable movement. Background Art

[0002] According to my country's population statistics in recent years, in 2018, the total population of my country over 65 years old accounted for 11.94%. These elderly people rely heavily on wheelchairs for their daily travel; and due to traffic accidents, sudden accidents, and diseases, a large number of people have lost their walking function. These elderly groups and groups that have lost their walking function have increased the demand for wheelchairs in society. And most of this group of people need to rely entirely on wheelchairs for most of the time, so the comfort and scientificity of wheelchairs are very important. The height of the wheelchair will affect the user's sitting posture. Long-term uncomfortable sitting posture will cause the user's waist, legs, back, neck, etc. to be in an abnormal working position, which is easy to cause joint damage to the user in daily activities. However, due to the large differences in body size among groups, the cost of setting a fixed-size wheelchair alone is high and the universality is low. Therefore, most existing wheelchairs can be adjusted in height to adapt to the safe use of users of different body sizes.

[0003] The existing wheelchair height adjustment method is mainly carried out by screw rods, hydraulic rods and cross rods. For example, CN211067519U discloses a method for adjusting the height of a seat with a screw rod, wherein the height adjustment structure includes a cover, a rocker, a rotating rod, a ratchet, a ratchet, a spring, a first bevel gear, a second bevel gear, a threaded sleeve, a threaded rod, a support block and a telescopic rod. The cover is fastened to the lower end of the middle part of the frame, the left side of the rocker is fixed to the rotating rod, and the left side of the rotating rod passes through the cover and is fixed to the ratchet, the ratchet is arranged on the right side of the lower end of the cover, the spring is tightly wound on the lower end of the ratchet, the right side of the first bevel gear is fixed to the rotating rod, and the first bevel gear and the right side of the second bevel gear are meshed with each other, the second bevel gear is fastened to the middle part of the threaded sleeve, and the bottom of the threaded sleeve is rotated with the inside of the cover through a bearing, the bottom of the threaded rod is meshed and rotated with the threaded sleeve, the bottom of the support block is respectively fixed to the threaded rod and the telescopic rod, and the middle part of the support block slides up and down on the upper end of the cover. This structure adjusts the wheelchair to rise or fall by shaking a rotating rod, which is convenient but laborious, and the screw rod is prone to slippage, so the stability and safety are poor.

[0004] CN105853081B discloses a height adjustment mechanism, the height adjustment mechanism is composed of a lower bracket inner plate, a lower bracket inner plate connecting plate B, an electric push rod A, a semicircular connecting plate A, a semicircular connecting plate B, a bottom sliding rod, a lower connecting rod bracket A, a guide rail slider A, a guide rail A, a lower bracket outer frame, a lower connecting rod A, a lower bracket inner plate connecting plate A and a lower connecting rod B. The other end of the lower connecting rod B of the height adjustment mechanism is connected to the lower part of the bed backrest of the electric wheelchair bed body, and the other end of the lower connecting rod A is connected to the lower part of the bed calf board of the electric wheelchair bed body through a cam bearing. The electric wheelchair bed body is composed of a lower connecting rod bracket B, a bed backrest, a guide rail slider B, a guide rail B, a bed backrest connecting plate A, a bed backrest connecting plate B, a bed backrest connecting plate C, an armrest bracket, a triangular handle, an electric push rod B, a bed seat plate connecting plate, a bed seat plate, a bed calf board, a bed foot board, an inverted door-shaped outer frame, The invention relates to a bed backrest deformation connecting rod, a bed backrest, a bed backrest deformation connecting rod, a bed calf board long deformation connecting rod and a bed calf board short deformation connecting rod. An inverted door-shaped outer frame is sleeved on the outer wall of the bed calf board and the bed footboard, and the upper end of the inverted door-shaped outer frame extends to the upper part of the bed calf board. The upper end of the inverted door-shaped outer frame is respectively connected to one end of a bed backrest deformation connecting rod through a rotating pin shaft, and the other end of each bed backrest deformation connecting rod is respectively connected to two side surfaces of the bed backrest through a rotating pin shaft, and the outer side of each bed backrest deformation connecting rod is respectively connected to one end of the bed calf board long deformation connecting rod through a rotating pin shaft, and the other end of the bed calf board long deformation connecting rod is connected to one end of the bed calf board short deformation connecting rod through a rotating pin shaft, and the other end of the bed calf board short deformation connecting rod is connected to two side surfaces of the inverted door-shaped outer frame through a rotating pin shaft, and the bed footboard rotates with the bed calf board short deformation connecting rod. This patent uses an electric push rod to push the lower link to change the angle to achieve the height increase or decrease of the wheelchair. However, this method will cause the distance between the upper link and the lower link to change when used, thereby causing the force structure of the wheelchair to change, reducing the user's comfort and possibly reducing the stability of the wheelchair.

[0005] Most existing wheelchairs have a simple structure, and most of them are equipped with universal wheels that can change angles at the front wheels. Since the front wheels need to change their own direction, in order to avoid the wheelchair losing its center of gravity due to the steering of the front wheels, the main weight of the wheelchair is mostly concentrated on the rear wheels. This arrangement makes it very easy to lose the center of gravity in bumpy conditions, and it is difficult to maintain balance. In addition, the existing height adjustment method can support the adjustment of the height while the user is riding, but this method has high requirements for the strength of the threads and the electric push rod. Therefore, due to the user's excessive weight, the threads are easily damaged or slipped during the adjustment process, causing the wheelchair to suddenly lower, causing the patient to fall or be frightened, and the safety is limited.

[0006] In addition, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the inventor studied a large number of documents and patents when making the present invention, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the present invention does not have the characteristics of these prior arts. On the contrary, the present invention already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology. Summary of the invention

[0007] In view of the shortcomings of the prior art, an adjustable wheelchair based on Mecanum wheels for stable movement is disclosed. The adjustable wheelchair comprises at least a base and a cushion, wherein the base is used to connect the wheels, and the cushion is connected to the base through an adjustment assembly for supporting the weight of the user, and the adjustment assembly comprises an adjustable component 1 for adjusting the height of the seat. The adjustable component 1 comprises a first bracket and a second bracket arranged crosswise with each other, and the adjustable component 1 is connected to the base through a movable assembly in a manner that the height of the seat can be increased by changing the height of one end of the first bracket close to the base and keeping the seat horizontal and the distance between the first bracket and the second bracket close to the cushion unchanged. The first bracket and the second bracket are arranged in an arc shape facing the first direction in a manner that the center of gravity offset position of the device is less than a first threshold value when the device is rotated a certain angle toward the first direction. Preferably, the first threshold value is the center of gravity position offset value generated when the straight rods arranged in the same direction are rotated the same angle toward the first direction.

[0008] According to a preferred embodiment, the base of the adjustable wheelchair includes a frame, a first support rod and a second support rod. The first support rod includes a first end and a second end, and the second support rod includes a third end and a fourth end. The second end of the first support rod and the fourth end of the second support rod are rotatably connected to each other through a first bearing. A pair of first wheels and a pair of second wheels are symmetrically arranged on the frame, and the second end of the first support rod and the first wheel are movably connected to the frame through a second bearing. The third end of the first support rod and the second wheel are movably connected to the frame through a third bearing. The first support rod, the second support rod and a side of the frame form a triangle in a manner that can ensure the stability of the wheelchair, and a side of the frame is the hypotenuse of the triangle.

[0009] According to a preferred embodiment, the first bracket includes a fifth end and a sixth end, and the fifth end of the first bracket is rotatably connected to the side surface of the seat cushion facing the ground. The sixth end of the first bracket is connected to the base through a movable component in a manner that can change the setting position. The second bracket includes a seventh end and an eighth end, and after the second bracket crosses the first bracket, the seventh end is rotatably connected to the side surface of the seat cushion facing the ground, and the eighth end of the second bracket is connected to the second end of the first support rod and the fourth end of the second support rod through a first bearing.

[0010] The first bracket and the second bracket intersect each other at the first connection point, and the first section of the first bracket, the second section of the second bracket and the third section of the seat cushion form a triangle. The first section is the section from the fifth end of the first bracket to the first connection point, the second section is the section from the seventh end of the second bracket to the first connection point, and the third section is the section between the fifth end of the first bracket and the seventh end of the second bracket on the side surface of the seat cushion close to the ground.

[0011] According to a preferred embodiment, the first connection point is provided with a fixed structure and a connecting rod, and the two ends of the connecting rod are respectively connected to two first connection points arranged on both sides of the wheelchair, and the two opposite first connection points are tightly connected by cooperating with the fixed structure at both ends.

[0012] According to a preferred embodiment, the movable component is arranged on a frame between the first wheel and the second wheel, and the sixth end of the first bracket is connected to the movable component. When the second bracket rotates in a direction away from the ground with the first bearing as the center so that the straight-line distance between the seventh end of the second bracket and the ground increases by S1, the connection point between the sixth end of the first bracket and the movable component is changed from being connected to the first working position of the movable component to being connected to the second working position of the movable component in a manner that the fifth end of the first bracket and the seventh end of the second bracket are in the same horizontal plane while keeping the distance between the fifth end of the first bracket and the seventh end of the second bracket unchanged.

[0013] According to a preferred embodiment, the movable component is adapted to the structure of the first bracket to have at least a first working position and a second working position.

[0014] According to a preferred embodiment, the adjustment assembly further includes an adjustable component 2 for adjusting the height of the armrest. The adjustable component 2 includes a first rod, a second rod, a handle, and a locking component for maintaining the relative position between the first rod and the second rod. The first rod and the second rod are set to different sizes, the first rod and the second rod are coaxially plugged into each other, and the locking component is sleeved outside the plug-in point of the first rod and the second rod and can maintain the connection between the first rod and the second rod based on rotation in a first direction, and can loosen the connection between the first rod and the second rod based on rotation opposite to the first direction.

[0015] According to a preferred embodiment, the locking component includes a lock seat with a plurality of spring sheets at one end and a lock sleeve which is sleeved on the outer side of the lock seat and can rotate forward and backward. The surface of the spring sheets is provided with at least one outwardly convex arc portion, and the inner side of the lock sleeve is provided with inner grooves which are the same in number and matched with the arc portions. When rotating in a first direction, the arc portions enter the inner grooves, so that the squeezing force on the spring sheets disappears, and the spring sheets are separated from the tight connection with the inner rod; when rotating in a second direction, the arc portions escape from the inner grooves, so that the spring sheets are squeezed and tightly embrace the first rod inserted therein, thereby realizing the fixed connection between the first rod and the second rod.

[0016] According to a preferred embodiment, the handle is connected to the end of the first rod away from the second rod through a rotation positioning assembly in such a way that the handle can rotate to a certain angle relative to the first rod and remain at the angle for at least t1 time. After the handle rotates to a certain angle relative to the first rod, it can be positioned by the rotation positioning assembly so that it can remain at the angle for at least t1 time, so that the user can sit in the wheelchair.

[0017] According to a preferred embodiment, the rotation positioning assembly includes a limit assembly, a spring, a shaft passing through the center of the spring and connected to the handle, and a limit plate connected to the end of the shaft away from the handle. The limit assembly includes a limit ring and a clamping block fixedly connected to the shaft at one end close to the shaft. One end of the spring abuts against the clamping block, and the other end abuts against the limit plate. The ninth end of the limit ring away from the handle is connected to the end of the first rod close to the handle. The tenth end of the limit ring relative to the ninth end is provided with a plurality of grooves recessed toward the ninth end for connecting with and fixing the clamping block.

[0018] The beneficial technical effects of the present invention are as follows: based on the adjustment component 1, the height of the seat can be changed without changing the supporting force structure of the seat cushion, and there are two triangular support structures during the adjustment process, so the support is stable; the first support rod and the second support rod are connected by a bearing, so that they can rotate relative to each other to a certain extent when they are strongly squeezed, so as to play a buffering role, reduce the shaking of the seat cushion, and improve the comfort of use. Based on the adjustable component 2, the armrest of the wheelchair can be rotated to a certain angle toward the side, thereby expanding the range of users sitting on the wheelchair, making it easier for users to sit on the wheelchair, and making it easier for caregivers of patients with lower body weakness to carry the patients to the wheelchair from the side, making the use process more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention;

[0020] Figure 2 It is a structural schematic diagram of a preferred embodiment of the adjustable component 2 of the present invention.

[0021] Reference numerals list

[0022] 10: First support rod 11: First end 12: Second end

[0023] 20: Second support rod 21: Third end 22: Fourth end

[0024] 30: first bracket 31: fifth end 32: sixth end

[0025] 40: second bracket 50: movable assembly 60: second rod

[0026] 70: first rod 80: locking component 81: locking sleeve

[0027] 82: Lock seat 90: Handle 100: Rotation positioning assembly

[0028] 110: Limiting ring 120: Block 130: Limiting piece

[0029] 140: Axis DETAILED DESCRIPTION

[0030] The following is a detailed description with reference to the accompanying drawings.

[0031] Mecanum wheels are based on the principle of a central wheel with many axles located around the wheels. The angled peripheral axles convert part of the wheel steering force into a wheel normal force. Depending on the direction and speed of each wheel, the final synthesis of these forces produces a resultant force vector in any required direction, thereby ensuring that the platform can move freely in the direction of the final resultant force vector without changing the direction of the wheel itself. The setting of Mecanum wheels is suitable for free movement in multiple directions in a small space. Since the direction of the axle itself does not need to be changed, the force is stable during the movement and the movement is smooth. Compared with universal wheels that can freely change their own direction to adapt to moving in different directions, a pair of Mecanum wheels will not form contradictory angles with each other due to the change of their own direction, and can adapt to the direction of thrust and move in all directions without changing their own direction. Therefore, it is very stable and safe when used as the front wheel of a wheelchair.

[0032] Example 1

[0033] The present invention provides an adjustable wheelchair for stable movement based on Mecanum wheels. The adjustable wheelchair includes a base, a seat cushion, a backrest and armrests. The base is used to connect the wheels to provide force support for the entire wheelchair. The seat cushion is connected to the base through an adjustment device to obtain support force from the ground. The adjustment component is used to adjust the height of the seat cushion so that the wheelchair can be adapted to users of different body shapes, and reduce the problem of improper sitting posture of users and chronic wear and tear of users' joints during use caused by inappropriate wheelchair height. The adjustment component includes an adjustable component 1 for adjusting the seat height and an adjustable component 2 for adjusting the armrest height. Preferably, the adjustable component 1 includes a first bracket 30 and a second bracket 40, and the first bracket 30 and the second bracket 40 are arranged crosswise with each other. When the user sits on the wheelchair, a pair of adjustable components 1 are respectively arranged on both sides close to the user's hands. The first bracket 30 and the second bracket 40 of the adjustable component 1 are respectively arranged to have an arc with a certain curvature. Preferably, the curvature is 0.02-0.11. The adjustable component 1 can raise the height of the seat by changing the height of one end of the first bracket 30 close to the base and keeping the seat horizontal while keeping the distance between one end of the first bracket 30 and the second bracket 40 close to the seat cushion unchanged. Preferably, the first bracket 30 and the second bracket 40 are arranged in the same bending direction. Preferably, the adjustable component 2 includes a first rod 70 and a second rod 60 plugged into each other, and a locking sleeve 81 for fixing the relative position of the first rod 70 and the second rod 60 is provided at the sleeve joint of the first rod 70 and the second rod 60. The first rod 70 and the second rod 60 can be adjusted to different heights by adjusting the relative position between each other. The locking sleeve 81 locks the relative position between the first rod 70 and the second rod 60 to keep the armrest at a fixed height. Through such a setting, the height of the seat cushion can be adjusted by adjusting the height of the first bracket 30 and the relative connection position between the first bracket 30 and the second bracket 40. And after adjusting the height, the seat cushion always remains horizontal and the distance between the connection point of the first bracket 30 and the seat cushion and the connection point of the second bracket 40 and the seat cushion remains unchanged. Thereby, the structure and force-bearing structure of the wheelchair seat cushion will not be affected. When using the wheelchair, the user does not need to adjust the sitting posture to adapt to the changed force-bearing structure of the seat cushion, so the user can always be kept in the most comfortable and scientific sitting posture.

[0034] According to a preferred embodiment, the base of the adjustable wheelchair includes a frame, a first support rod 10 and a second support rod 20. The first support rod 10 includes a first end 11 and a second end 12, and the second support rod 20 includes a third end 21 and a fourth end 22. The second end 12 of the first support rod 10 and the fourth end 22 of the second support rod 20 are rotatably connected to each other through a first bearing. A pair of first wheels and a pair of second wheels are symmetrically arranged on the frame of the wheelchair, and the first end 11 of the first support rod 10 and the first wheel are movably connected to the frame through a second bearing. Preferably, the first wheel is a Mecanum wheel. Therefore, the first wheel does not need to change its orientation when turning, so the first support rod 10 can be kept in a fixed position of the wheelchair and support stability. The third end 21 of the first support rod 10 and the second wheel are movably connected to the frame through a third bearing. Through such a setting mode, the first support rod 10, the second support rod 20 and a side of the frame form a triangle in a manner that can ensure the stability of the wheelchair, and one side of the frame is the hypotenuse of the triangle. The stability of the triangle is used to achieve the effect of stabilizing the seat on the support frame. Furthermore, since the first support rod 10 can rotate to a certain extent relative to the first bearing and the second bearing; the second support rod 20 can rotate to a certain extent relative to the second bearing and the third bearing, after the seat cushion is connected via the adjustable component 1, the first support rod 10 and the second support rod 20 can play a buffering role when necessary. For example, when the road surface is rough and the wheels shake, the first support rod 10 and the second support rod 20 can rotate slightly relative to the bearings to reduce the shaking amplitude of the wheelchair seat cushion, improve the user's comfort, and reduce the probability of the wheelchair losing its center of gravity and falling over.

[0035] According to a preferred embodiment, the first bracket 30 includes a fifth end 31 and a sixth end 32, the fifth end 31 of the first bracket 30 is rotatably connected to the side surface of the seat cushion facing the ground, and the sixth end 32 of the first bracket 30 is connected to the base through a movable component 50. The setting position of the sixth end 32 of the first bracket 30 can be changed through the connection of the movable component 50, thereby changing the height of the first bracket 30, and then changing the height of the seat. Through the support of the movable component 50, the first bracket 30 can be stably supported so that the seat is maintained at this height. Preferably, the second bracket 40 includes a seventh end and an eighth end, and the seventh end is rotatably connected to the side surface of the seat cushion facing the ground after the second bracket 40 crosses the first bracket 30. Preferably, the eighth end of the second bracket 40 is connected to the second end 12 of the first support rod 10 and the fourth end 22 of the second support rod 20 through a first bearing, so that the adjustment component 1 and the base of the wheelchair are connected to each other to obtain a supporting force. Preferably, the first bracket 30 and the second bracket 40 intersect each other at the first connection point, and the first section of the first bracket 30, the second section of the second bracket 40 and the third section of the cushion form a triangle. Thus, by utilizing the stability of the triangle, the wheelchair device can have higher stability. Preferably, the first section is the section from the fifth end 31 of the first bracket 30 to the first connection point, the second section is the section from the seventh end of the second bracket 40 to the first connection point, and the third section is the section between the fifth end 31 of the first bracket 30 and the seventh end of the second bracket 40 on the side surface of the cushion close to the ground.

[0036] According to a preferred embodiment, a fixing structure and a connecting rod are provided at the first connection points of the first bracket 30 and the second bracket 40, and the two ends of the connecting rod are respectively connected to the two first connection points provided on the two sides of the wheelchair, and the fixing structures are respectively matched at the two ends to tightly connect the two opposite first connection points. Preferably, the matching mode of the fixing structure and the connecting rod can be, for example, threaded matching.

[0037] According to a preferred embodiment, the movable component 50 is arranged on the frame between the first wheel and the second wheel, and the sixth end 32 of the first bracket 30 is connected to the movable component 50. Preferably, when the second bracket 40 rotates in a direction away from the ground with the first bearing as the center so that the linear distance between the seventh end of the second bracket 40 and the ground increases by S1, the connection point between the sixth end 32 of the first bracket 30 and the movable component 50 is changed from being connected to the first working position of the movable component 50 to being connected to the second working position of the movable component 50. In this way, the fifth end 31 of the first bracket 30 and the seventh end of the second bracket 40 can be in the same horizontal plane while keeping the distance between the fifth end 31 of the first bracket 30 and the seventh end of the second bracket 40 unchanged. Preferably, S1 can be 2cm-4cm. Preferably, S1 is most preferably 3cm.

[0038] According to a preferred embodiment, the movable component 50 is adapted to the structure of the first bracket 30 to have at least a first working position and a second working position. Wherein, when the first bracket 30 is connected to the first working position of the movable component 50, the wheelchair cushion is maintained at the lowest height. When the first bracket 30 is connected to the second working position of the movable component 50, the wheelchair is raised by S1 cm relative to the lowest position. Preferably, the movable component 50 also includes a third working position. When the first bracket 30 is connected to the third working position of the movable component 50, the wheelchair is raised by 2S1 relative to the lowest position. Preferably, the movable component 50 also includes a fourth working position, and when the first bracket 30 is connected to the fourth working position of the movable component 50, the wheelchair is raised by 3S1 relative to the lowest position. Preferably, the wheelchair is at the highest height at this time.

[0039] According to a preferred embodiment, the adjustable component 2 further includes a first rod 70, a second rod 60, a handle 90, and a locking component 80 for maintaining the relative position between the first rod 70 and the second rod 60. Preferably, the first rod 70 and the second rod 60 are set to different sizes, and the first rod 70 and the second rod 60 are coaxially plugged into each other. Preferably, the size of the first rod 70 is smaller than the size of the second rod 60, and the first rod 70 is inserted into the second rod 60. The locking component 80 is sleeved outside the plug-in point of the first rod 70 and the second rod 60 and can maintain the connection between the first rod 70 and the second rod 60 based on rotation in a first direction, and can loosen the connection between the first rod 70 and the second rod 60 based on rotation in a second direction opposite to the first direction.

[0040] According to a preferred embodiment, the locking component 80 includes a lock seat 82 and a lock sleeve 81. A plurality of springs are arranged at one end of the lock seat 82. One end of the lock seat 82 opposite to the spring is fixedly connected to one end of the second rod 60 near the handle 90. The lock sleeve 81 is sleeved on the outer side of the lock seat 82 and can control the tightness of the connection between the first rod 70 and the second rod 60 by rotating forward and backward. The surface of the spring is provided with at least one convex arc portion. The inner side of the lock sleeve 81 is provided with inner grooves that are the same in number and matched with the arc portions. When rotating in the first direction, the arc portion enters the inner groove, and the squeezing force on the spring disappears, and the spring is separated from the tight connection with the inner rod; when rotating in the second direction, the arc portion escapes from the inner groove, so that the spring is squeezed and tightly embraces the first rod 70 inserted therein, thereby realizing the fixed connection between the first rod 70 and the second rod 60. Through such a setting, the height of the armrest can be adjusted at any value within a certain range, and the adjustment method is simple, and the user can adjust it according to his needs.

[0041] According to a preferred embodiment, the handle 90 is connected to the end of the first rod 70 away from the second rod 60 by the rotation positioning assembly 100 in a manner that it can rotate to a certain angle relative to the first rod 70 and remain at the angle for at least t1 time. Preferably, the t1 time is the maximum time required for the user to sit on the wheelchair, for example, it can be 5 minutes. Through such a setting, the armrest can be rotated to a fixed angle as needed and maintained at this angle. When the user needs to get on and off the wheelchair, the armrest can be rotated to the outside of the wheelchair so that the user can get on the wheelchair from the side. Preferably, the rotation angle of the armrest can be 30°-90°, and most preferably 45°. Such a setting is particularly suitable for when the user's body is unable to exert force, and rotating the armrest to sit on the wheelchair from the side will make it easier for the caregiver to apply force to carry the user to the wheelchair.

[0042] According to a preferred embodiment, the rotation positioning assembly 100 includes a limiting ring 110, a spring, a shaft 140, a block 120 and a limiting plate 130. The ninth end of the limiting ring 110 away from the handle 90 is connected to the end of the first rod 70 close to the handle 90, and the tenth end of the limiting ring 110 relative to the ninth end is provided with a plurality of grooves recessed toward the ninth end for connecting with and fixing the block 120. The shaft 140 passes through the center of the spring and is connected to the handle 90. The limiting plate 130 is connected to the end of the shaft 140 away from the handle 90. The side surface of the first limiting plate contacts the inner side wall of the limiting ring 110, and the first limiting plate can slide relative to the inner side wall of the limiting ring 110. The block 120 is fixedly connected to the handle 90, and the block 120 can match the shape of the groove, so that the block 120 can be limited to move by the groove, thereby limiting the movement of the handle 90, so that the handle 90 is kept at a fixed angle. A second limiting piece is also provided in the limiting ring 110, and the second limiting piece is provided between the clamping block 120 and the first limiting piece. Both ends of the spring are connected to the first limiting piece and the second limiting piece respectively. A hole for the shaft 140 to pass through is provided in the middle of the second limiting piece. Preferably, the size of the hole is larger than the size of the shaft 140, so that the shaft 140 will not touch the second limiting piece during the movement.

[0043] When the adjustable component 2 is in use, the user can pull the handle 90 to drive the first limit plate to slide relative to the inner wall of the limit ring 110 toward the handle 90. As a result, the spring is compressed, and the block 120 fixedly connected to the handle 90 also disengages from the groove. At this time, the user changes the angle of the handle 90 by holding the handle 90 and rotating it. When the angle is changed to a suitable angle, the handle 90 is released, and the handle 90 can be reset downward based on the release of the elastic potential energy of the spring and gravity, and the block 120 is connected to the groove again, so that the angle of the handle 90 is fixed at this angle. When it is necessary to adjust again, just use the same method again.

[0044] It should be noted that the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the present invention description and its drawings are illustrative and do not constitute a limitation of the claims. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. An adjustable wheelchair for stable movement based on Mecanum wheels, the adjustable wheelchair comprising at least a base and a seat cushion, the base being used to connect the wheels, the seat cushion being connected to the base via an adjustment assembly for supporting the weight of a user, the adjustment assembly comprising an adjustable component for adjusting the seat height, It is characterized in that The adjustable component 1 comprises a first bracket (30) and a second bracket (40) arranged crosswise with each other, and the adjustable component 1 is connected to the base through a movable component (50) in such a way that the height of the seat can be increased by changing the height of one end of the first bracket (30) close to the base and keeping the seat horizontal and the distance between the first bracket (30) and the second bracket (40) close to the seat cushion unchanged, wherein: The base comprises a frame, a first support rod (10) and a second support rod (20), wherein the second end (12) of the first support rod (10) and the fourth end (22) of the second support rod (20) are rotatably connected to each other via a first bearing; The first bracket (30) and the second bracket (40) are arranged in an arc shape facing the first direction in such a way that when the device is rotated by a certain angle toward the first direction, the center of gravity offset position of the device is smaller than a first threshold value; The fifth end (31) of the first bracket (30) is rotatably connected to a surface of the seat cushion facing the ground, and the sixth end (32) of the first bracket (30) is connected to the base via the movable component (50); After the second bracket (40) intersects with the first bracket (30) at the first connection point, the seventh end is rotatably connected to the surface of the seat cushion facing the ground; the eighth end of the second bracket (40) is connected to the second end (12) of the first support rod (10) and the fourth end (22) of the second support rod (20) through the first bearing.

2. The adjustable wheelchair according to claim 1, characterized in that: The first support rod (10) and the second support rod (20) are respectively connected to different positions of a side edge of the frame in a manner that they can form a stable triangle with the frame.

3. The adjustable wheelchair according to claim 2, characterized in that: One end of the first bracket (30) and the second bracket (40) close to the seat cushion is respectively connected to a side of the seat cushion facing the ground so that the first section of the first bracket (30), the second section of the second bracket (40) and the third section of the seat cushion form a triangle.

4. The adjustable wheelchair according to claim 3, characterized in that: The first connection point is provided with a fixing structure and a connecting rod, and the two ends of the connecting rod are respectively connected to the two first connection points arranged on both sides of the wheelchair, and the two opposite first connection points are tightly connected by cooperating with the fixing structure at both ends.

5. The adjustable wheelchair according to claim 4, characterized in that: When the second bracket (40) rotates in a direction away from the ground with the first bearing as the center so that the straight-line distance between the seventh end of the second bracket (40) and the ground increases by S1, the connection point between the sixth end (32) of the first bracket (30) and the movable component (50) is changed from the first working position to the second working position.

6. The adjustable wheelchair according to claim 5, characterized in that: The movable component (50) is adapted to the structure of the first bracket (30) and is set to a shape that can have at least a first working position and a second working position.

7. The adjustable wheelchair according to claim 6, characterized in that: The adjustment assembly also includes an adjustable component 2 for adjusting the height of the armrest. The second adjustable component comprises a first rod (70), a second rod (60), a handle (90), and a locking component (80) for maintaining the relative position between the first rod (70) and the second rod (60). The first rod (70) and the second rod (60) are coaxially plugged into each other, and the locking component (80) is sleeved outside the plug-in point of the first rod (70) and the second rod (60) and can release or maintain the connection between the first rod (70) and the second rod (60) based on rotation in opposite directions.

8. The adjustable wheelchair according to claim 7, characterized in that: The locking component (80) comprises a lock seat (82) with a plurality of spring sheets at one end and a lock sleeve (81) sleeved on the outer side of the lock seat (82) and capable of positive and negative rotation, the spring sheets are provided with at least one outwardly convex arc portion on the surface, and the lock sleeve (81) is provided with inner grooves having the same number as the arc portions and matching with each other on the inner side, and the lock sleeve (81) releases or maintains the connection between the first rod (70) and the second rod (60) based on whether the arc portions match the inner grooves.

9. The adjustable wheelchair according to claim 8, characterized in that: The handle (90) is connected to an end of the first rod (70) away from the second rod (60) through a rotation positioning assembly (100) in such a manner that the handle (90) can be rotated to a certain angle relative to the first rod (70) and maintained at the angle for at least t1 time.

10. The adjustable wheelchair according to claim 9, characterized in that: The rotation positioning assembly (100) comprises at least a spring and a limit assembly, the handle (90) is connected to the limit assembly in a manner that allows positioning after rotation, and the handle (90) is connected to the spring via a shaft that penetrates the spring in a manner that allows tight connection with the limit assembly based on the elastic potential energy of the spring after rotation into position.

Images