Foldable wheelchair

Abstract

The foldable wheelchair mainly comprises a left vertical frame, a right vertical frame, a left upper rod, a right upper rod, a left supporting rod, a right supporting rod, a left rear supporting leg and a right rear supporting leg, the left vertical frame and the right vertical frame are of a left-right symmetrical structure, a left front foot wheel is installed at the lower end of the left vertical frame, a right front foot wheel is installed at the lower end of the right vertical frame, and the lower end of the left supporting rod is rotationally connected with the lower end of the inner side of the left vertical frame; the upper end of the left supporting rod is rotationally connected with the upper end of the inner side of the right vertical frame through a right bent rod, the lower end of the right supporting rod is rotationally connected with the lower end of the inner side of the right vertical frame, and the upper end of the right supporting rod is rotationally connected with the upper end of the left vertical frame through a left bent rod. The right rear supporting leg is rotationally connected with the right vertical frame and can be locked through a hook, the right rear wheel is installed at the rear end of the right rear supporting leg, the left upper rod is installed at the upper end in the left vertical frame and can move up and down and be positioned, and the right upper rod is installed at the upper end in the right vertical frame and can move up and down and be positioned.

Description

Technical Field

[0001] The invention relates to a medical walking aid device, in particular to a foldable wheelchair. Background Art

[0002] Walkers help users maintain balance and reduce the risk of falling by increasing the support area when walking. This is especially important for the elderly, disabled people, or people who have unstable walking due to illness; for people with insufficient or injured lower limbs, walkers can share part of the body weight, reduce the burden on the lower limbs, and make walking easier and less laborious; during the rehabilitation process, walkers are often used as a training tool to help patients gradually restore their walking ability; the use of walkers enables people with limited mobility to carry out daily life activities more independently, such as shopping, walking, doing housework, etc., thereby improving their quality of life and self-confidence; walkers are not only a physical aid, but also a psychological support, which reminds people that despite the challenges they face, they can still maintain independence and autonomy; in short, walkers play an important role in helping people with limited mobility maintain balance, reduce burdens, promote rehabilitation, and improve quality of life.

[0003] Wheelchairs are the key to restoring or maintaining mobility for people who have lost the ability to walk due to illness, disability or old age. They allow users to move to different places independently without the help of others to meet their daily life and social needs. The use of wheelchairs enables people with limited mobility to participate in social activities more widely and enjoy a more fulfilling and rich life. For people with insufficient or injured lower limbs, standing or walking for a long time may cause physical fatigue and discomfort. The use of wheelchairs can share part of the body weight, reduce the burden on the lower limbs, and make users more comfortable and relaxed during movement. Wheelchairs are not only a physical assistive tool, but also a psychological support. It represents a positive attitude towards life and hope for the future. By using wheelchairs, users can maintain contact and communication with the outside world and reduce the loneliness and helplessness caused by limited mobility. In summary, wheelchairs play an important role in providing mobility, enhancing independence, promoting rehabilitation, improving quality of life, reducing physical burden and providing psychological support. For people with limited mobility, wheelchairs are an indispensable and important partner in their lives.

[0004] The combination of a walker and a wheelchair is an innovative design concept that aims to meet the mobility needs of people with limited mobility in a variety of scenarios. This combined product usually combines the stability of a walker and the convenience of a wheelchair to provide users with more comprehensive and flexible auxiliary support. A walker wheelchair can be used as a walker to provide stable support and balance, and can also be used as a wheelchair to reduce the need to change equipment and facilitate long-distance movement or sitting down when resting. This versatility makes the product more adaptable to different scenarios and needs. Under existing technical conditions, the functions of walkers and wheelchairs are relatively simple, and there are very few products that can be organically combined. Therefore, the development of a wheelchair with a walking aid function, easy to use and quick to fold has significant social significance. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a foldable wheelchair, which mainly includes a left frame, a left upper rod, a left hand brake, a right hand brake, a right upper rod, a right frame, a right support rod, a right rear leg, a left rear wheel, a left rear leg, a left support rod, a right curved rod and a left curved rod, characterized in that: a left upper rod slide with an open upper end is vertically arranged inside the left frame, a left support rod is arranged on the inner side of the upper end of the left frame, and a left positioning rod is arranged on the rear side of the lower end of the left frame; the right frame and the left frame are in a left-right symmetrical structure; a right-facing horizontal bending section is arranged on the upper end of the left support rod, the lower end of the left support rod is rotatably connected to the lower end of the inner side of the left frame, the left end of the right curved rod is rotatably connected to the upper end of the left support rod, and the right end of the right curved rod is rotatably connected to the right The upper inner end of the vertical frame is rotatably connected; the upper end of the right support rod is provided with a left horizontal bending section, the lower end of the right support rod is rotatably connected to the lower inner end of the right vertical frame, the left end of the left bent rod is rotatably connected to the upper inner end of the left vertical frame, and the right end of the left bent rod is rotatably connected to the upper end of the right support rod; the middle position of the left support rod is rotatably connected to the middle position of the right support rod through a pin shaft; the left bar slider is rotatably connected to the left horizontal bending section, the left bar guide rail on the lower side of the left seat bar is installed in cooperation with the left bar slider to form a moving pair, a left bar limiting groove is provided on the left side of the left seat bar, the right bar slider is rotatably connected to the right horizontal bending section, the right bar guide rail on the lower side of the right seat bar is installed in cooperation with the right bar slider to form a moving pair, and a right bar limiting groove is provided on the left side of the left seat bar The left rear wheel is rotatably mounted on the outside of the rear end of the left rear leg, and a long guide groove is provided at the inner rear end of the left rear leg, a left wire tube limit platform is provided on the front side of the long guide groove, and an arc-shaped tooth is provided on the front side of the left end of the left brake block. The block is installed in the above-mentioned long guide groove and can move forward and backward, and the left rear brake spring is installed between the left brake block slide and the left wire tube limit platform; the right rear wheel and its related brake components are in a left-right symmetrical structure with the left rear wheel and its related brake components, and the right rear wheel is rotatably installed on the outer side of the rear end of the right rear support leg; a left rear handle is horizontally arranged on the rear side of the upper end of the left upper rod, a left hand brake is arranged on the lower side of the left rear handle, a left front handle is arranged on the front side of the upper end of the left upper rod, the lower end of the left upper rod is a hollow square rod structure, and the square rod structure at the lower end of the left upper rod is installed in the left upper rod slideway and can move up and down and be positioned; the right upper rod is in a left-right symmetrical structure with the left upper rod, a right hand brake is arranged on the upper end of the right upper rod, and the right upper rod is installed on the upper end of the right stand and can move up and down and be positioned;A left pull wire runs through the left wire tube, which is installed inside the square rod structure of the left upper rod. Its upper port is connected to the front end of the left hand brake, and its lower end is installed on the front side of the left wire tube limiter. The upper end of the left pull wire is tightly connected to the lever handle inside the left hand brake. After the lower end of the left pull wire passes through the lower end of the left wire tube, it is tightly connected to the left brake block. The left hand brake realizes the braking of the left rear wheel through the left pull wire; the right wire tube has the same structure as the left wire tube, and a right pull wire runs through the right wire tube. The right hand brake realizes the braking of the right rear wheel through the right pull wire. ;

[0006] As a further solution of the present invention: the left front caster and the right front caster are both universal wheel structures.

[0007] As a further solution of the present invention: a threaded hole is transversely arranged on the left side of the left slider, and a left locking button is installed in the threaded hole to form a thread pair.

[0008] As a further solution of the present invention: the seat cloth is made of coarse canvas material, and a pull strip is provided on the upper side of the seat cloth.

[0009] As a further solution of the present invention: the upper left locking rod is installed on the rear side of the upper end of the left stand, and the upper left locking rod can move forward and backward to achieve locking and unlocking of the upper left rod.

[0010] As a further solution of the present invention: a notch is provided on the upper side of the left rear leg near the rear end, and the notch is provided to prevent the left rear leg from interfering with the protrusion at the upper end of the left stand when the left rear leg is in a folded storage state.

[0011] As a further solution of the present invention: the left wire tube is a tubular structure with certain flexibility, and the left wire tube cannot be compressed in the axial direction, and a spiral structure is arranged at the upper end of the left wire tube.

[0012] As a further solution of the present invention: a plurality of positioning holes are vertically and evenly spaced on the rear side surface of the square rod structure at the lower end of the upper left rod.

[0013] As a further solution of the present invention: an inner gear ring is arranged on the inner side of the left rear wheel.

[0014] As a further solution of the present invention: the front end of the left hook is provided with a hook-shaped structure, and the front end of the hook-shaped structure is provided with a guiding inclined surface.

[0015] The beneficial effects of the present invention are as follows: (1) When the wheelchair is in a walking aid state, the user can hold the left rear handle and the right rear handle with both hands to assist walking; when the wheelchair is in a wheelchair state, the user can sit on the seat cloth, and the accompanying person can hold the left front handle and the right front handle with both hands to push the wheelchair to walk; when the wheelchair is in a folded storage state, the volume of the wheelchair can be significantly reduced, which is convenient for storage or transportation. (2) The two rear wheels can be braked by two hand brakes, which can ensure the safety of the user in the walking aid state and prevent the wheelchair from losing control and slipping during use. (3) The left upper rod and the right upper rod can be adjusted in height according to the height of the user, making the wheelchair more widely applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention when it is in a walking aid state.

[0017] Figure 2 It is a schematic diagram of the overall structure of the present invention when it is in a wheelchair state.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the upper left rod position in the present invention.

[0019] Figure 4 It is a partial enlarged structural schematic diagram of the left stand position in the present invention.

[0020] Figure 5 It is a partial enlarged structural schematic diagram of the position of the left support rod in the present invention.

[0021] Figure 6 It is a schematic diagram of the partial cross-sectional structure of the front end of the left rear supporting leg in the present invention (locked state).

[0022] Figure 7 It is a schematic diagram of the partial cross-sectional structure of the front end of the left rear supporting leg in the present invention (unlocked state).

[0023] Figure 8 It is a schematic diagram of the partial cross-sectional structure of the rear end of the left rear support leg in the present invention.

[0024] Fig. 9 It is a schematic diagram of the overall structure of the present invention when it is in a folded and stored state.

[0025] Figure numbers: 1 left stand, 1.1 left lower connection seat, 1.2 left support rod, 1.3 left upper connection seat, 1.4 left bar limit rod, 1.5 left upper locking rod cavity, 1.6 left positioning rod, 2 left seat bar, 2.1 left bar guide rail, 2.2 left bar limit groove, 3 left lock button, 4 left upper rod, 4.1 left rear handle, 4.2 left front handle, 4.3 positioning hole, 5 left hand brake, 6 right hand brake, 7 right upper rod, 8 seat cloth, 8.1 pull rod, 9 right seat bar, 10 right stand, 10.1 right lower connection seat, 10.2 right support rod, 11 right leg locking rod, 12 right support rod, 12.1 left bar connection seat, 13 right front caster , 14 right wire tube, 15 right rear outrigger, 16 left front caster, 17 left rear wheel, 17.1 inner gear ring, 18 left rear outrigger, 18.1 left hook shaft, 18.2 left outrigger locking rod cavity, 18.3 left wire tube limiting platform, 19 right rear wheel, 20 left outrigger locking rod, 21 left support rod, 22 right curved rod, 23 right upper locking rod, 24 left curved rod, 25 left wire tube, 25.1 left pull wire, 26 left upper locking rod, 27 left upper locking spring, 28 left slider, 29 left leg locking spring, 30 left connecting rod, 31 left hook, 32 left outrigger shaft, 33 left rear brake spring, 34 left brake block, 34.1 left brake block slide. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0027] like Figure 1-9As shown, a foldable wheelchair mainly includes a left stand 1, a left seat bar 2, a left lock button 3, a left upper rod 4, a left hand brake 5, a right hand brake 6, a right upper rod 7, a seat cloth 8, a right seat bar 9, a right stand 10, a right leg locking rod 11, a right support rod 12, a right front caster 13, a right wire tube 14, a right rear leg 15, a left front caster 16, a left rear wheel 17, a left rear leg 18, a right rear wheel 19, a left leg locking rod 20, a left support rod 21, a right curved rod 22, a right upper locking rod 23, a left curved rod 24, a left wire tube 25, a left upper locking rod 26, a left upper locking spring 27, a left bar slider 28, a left leg locking spring 29, a left connecting rod 30, a left hook 31, a left leg rotating shaft 32, a left rear brake spring 33, and a left brake block 34, wherein the left stand 1 is The structure is narrow at the top and wide at the bottom, and a left front caster 16 is installed on the front side of its lower end. The left front caster 16 is a universal wheel structure. A left upper rod slide with an upper end opening is vertically arranged inside the left stand 1. A backward protrusion is also provided on the rear side of the upper end of the left stand 1. A left upper locking rod cavity 1.5 is longitudinally arranged inside the protrusion, and a left support rod 1.2 is transversely arranged on the right end of the outer side of the protrusion. A circular baffle with a larger diameter is arranged on the right end of the left support rod 1.2. The front end of the left upper locking rod cavity 1.5 is connected with the left upper rod slide. A circular hole is arranged on the upper rear side of the lower end of the left stand 1, and a left leg rotating shaft 32 is coaxially fixedly installed in the circular hole. The left leg rotating shaft 32 is a round shaft structure with a smooth appearance, and is fixed at the lower rear side of the lower end of the left stand 1. A left positioning rod 1.6 is provided, a left upper connecting seat 1.3 is provided at the inner upper end of the left stand 1, a left semicircular groove is laterally provided on the upper side of the left upper connecting seat 1.3, a left lower connecting seat 1.1 is provided at the inner lower end of the left stand 1, and a left bar limiting rod 1.4 of a stepped cylindrical structure is also provided at the inner middle position of the left stand 1; the right stand 10 is a left-right symmetrical structure with the left stand 1, the right stand 10 is a structure that is narrow at the top and wide at the bottom, and a right front caster 13 is installed on the front side of its lower end, and the right front caster 13 is a universal wheel structure, a right upper rod slide with an open upper end is vertically provided inside the right stand 10, and a rearward protrusion is also provided on the upper rear side of the right stand 10, and a right upper locking rod cavity is longitudinally provided inside the protrusion, A right support rod 10.2 is laterally arranged at the left outer end of the protrusion, and a circular baffle with a larger diameter is arranged at the left end of the right support rod 10.2. The front end of the right upper locking rod cavity is connected with the right upper rod slideway. A circular hole is arranged on the upper rear side of the lower end of the right vertical frame 10, and a right support leg rotating shaft is coaxially fixedly installed in the circular hole. The right support leg rotating shaft is a circular shaft structure with a smooth appearance. A right positioning rod is fixedly arranged on the lower rear side of the lower end of the right vertical frame 10, a right upper connecting seat is arranged on the upper inner end of the right vertical frame 10, and a right semicircular groove is laterally arranged on the upper side of the right upper connecting seat, a right lower connecting seat 10.1 is arranged on the inner lower end of the right vertical frame 10, and a right bar limiting rod with a stepped cylindrical structure is also provided at the middle position of the inner side of the right vertical frame 10.

[0028] like Figure 2 , Figure 4As shown, the left support rod 21 is a round rod-shaped structure, and a right horizontal bending section is provided at its upper end, and a right bar connecting seat is provided on the upper side of the right end of the right horizontal bending section, and the lower end of the left support rod 21 is rotatably connected to the left lower connecting seat 1.1; the left end of the right curved rod 22 is rotatably connected to the position close to the upper end of the left support rod 21, and the right end of the right curved rod 22 is rotatably connected to the right upper connecting seat; the right support rod 12 is a round rod-shaped structure, and a left horizontal bending section is provided at its upper end, and a left bar connecting seat 12.1 is provided on the upper side of the left end of the left horizontal bending section, and the lower end of the right support rod 12 is rotatably connected to the right lower connecting seat 10.1; the left curved rod 24 has the same structure as the right curved rod 22 However, the installation directions are opposite, the left end of the left curved rod 24 is rotationally connected to the upper left connecting seat 1.3, and the right end of the left curved rod 24 is rotationally connected to the position near the upper end of the right support rod 12; the middle position of the left support rod 21 is rotationally connected to the middle position of the right support rod 12 through a pin shaft; thus, when the left stand 1 and the right stand 10 are opened to both sides, the left horizontal bending section at the upper end of the right support rod 12 can be inserted into the left semicircular groove on the upper side of the upper left connecting seat 1.3, and the left semicircular groove can provide support and limit for the left horizontal bending section. At the same time, the right horizontal bending section at the upper end of the left support rod 21 can be inserted into the right semicircular groove on the upper side of the upper right connecting seat, and the right semicircular groove can provide support and limit for the right horizontal bending section.

[0029] like Figure 2 , Figure 4 As shown, the lower end of the left bar slider 28 is rotatably connected to the left bar connecting seat 12.1, and a threaded hole is horizontally arranged on the left side of the left bar slider 28, in which a left locking button 3 is installed to form a threaded pair; the lower side of the left seat bar 2 is provided with a left bar guide rail 2.1, and the left side of the left seat bar 2 is provided with a left bar limiting groove 2.2, the left bar limiting groove 2.2 is a semi-circular arc groove structure, and the arc diameter of the inner end is larger than the arc diameter of the outer port, the left bar guide rail 2.1 is installed in cooperation with the left bar slider 28 and forms a moving pair, so that the left seat bar 2 can be flipped and slid; and tightening the left locking button 3 can lock the sliding of the left seat bar 2; the right bar slider has the same structure as the left bar slider 28 but is installed in the opposite direction, and the lower end of the right bar slider is rotatably connected to the right bar connecting seat The right side of the right bar slider is connected, and a threaded hole is horizontally arranged on the right side of the right bar slider, in which a right locking button is installed to form a threaded pair; the right seat bar 9 is symmetrical with the left seat bar 2 in structure, and a right bar guide rail is arranged on the lower side of the right seat bar 9, and a right bar limiting groove is arranged on the right side of the right seat bar 9, the right bar limiting groove is a semi-circular arc groove structure, and the arc diameter of the inner end is larger than the arc diameter of the outer end, the right bar guide rail is installed in cooperation with the left bar slider and forms a moving pair, so that the right seat bar 9 can be flipped and slid; and tightening the right locking button can lock the sliding of the right seat bar 9; the seat cloth 8 can be made of coarse canvas material, the left end of which is tightly connected to the right side of the left seat bar 2, the right end of the seat cloth 8 is tightly connected to the left side of the right seat bar 9, and a pull strip 8.1 is also provided on the upper side of the seat cloth 8.

[0030] like Figure 6 , Figure 7 As shown, the front end upper side of the left rear leg 18 is rotatably connected with the left leg rotating shaft 32, the left rear leg 18 is an internally hollow structure, and a left leg locking rod cavity 18.2 is vertically arranged at the upper end of the front end interior, and a left hook rotating shaft 18.1 is arranged at the lower end of the front end interior of the left rear leg 18; the front end of the left hook 31 is provided with a hook-shaped structure, and the front end of the hook structure is provided with a guiding inclined surface, and the rear end of the left hook 31 is rotatably connected with the left hook rotating shaft 18.1; the left leg locking rod 20 is coaxially installed in the left leg locking rod cavity 18.2 and can move up and down, and the upper end of the left leg locking rod 20 is provided with a spherical structure, which is convenient for manual pressing and force application, and a spring retaining ring is provided near the middle position of the left leg locking rod 20, and the lower end of the left leg locking rod 20 is rotatably connected to the upper end of the left connecting rod 30, and the lower end of the left connecting rod 30 is rotatably connected to the middle position of the left hook 31; the left leg locking spring 29 is coaxial When the left rear leg 18 needs to be folded and stored, the left leg locking rod 20 is pressed downward, so that its lower end pushes the left hook 31 to rotate downward through the left connecting rod 30 and releases the hook on the left positioning rod 1.6, and then the left rear leg 18 is rotated upward to complete the folding and storage.

[0031] like Figure 1 , Figure 2As shown, the front end upper side of the right rear leg 15 is rotatably connected with the right leg rotating shaft, and the right rear leg 15 is an internally hollow structure, and a right leg locking rod cavity is vertically arranged at the upper end of its front end interior, and a right hook rotating shaft is arranged at the lower end of the front end interior of the right rear leg 15; the right hook has the same structure as the left hook 31, a hook-shaped structure is arranged at the front end of the right hook, and a guide inclined surface is arranged at the front end of the hook structure, and the rear end of the right hook is rotatably connected with the right hook rotating shaft; the right leg locking rod 11 is coaxially installed in the right leg locking rod cavity and can move up and down, and a spherical structure is arranged at the upper end of the right leg locking rod 11, and the spherical structure is convenient for manual pressing and force application, and a spring retaining ring is arranged near the middle position of the right leg locking rod 11, and the lower end of the right leg locking rod 11 is rotatably connected to the upper end of the right connecting rod, and the lower end of the right connecting rod is rotatably connected to the middle position of the right hook; The right leg locking spring is coaxially installed at the lower end of the right leg locking rod cavity, and the upper end of the right leg locking spring is pressed against the lower side of the above-mentioned spring retaining ring, so that under the elastic force of the right leg locking spring, the right leg locking rod 11 always has a tendency to drive the right hook to rotate upward; when it is necessary to open the right rear leg 15, the right rear leg 15 is rotated downward clockwise, and the right positioning rod will contact the guiding inclined surface at the front end of the right hook, causing the right hook to rotate downward and open, until the front end of the right rear leg 15 is attached and pressed against the right stand 10, the right hook is rotated upward, and the hook-shaped structure at its front end clamps the right positioning rod, completing the opening and locking of the right rear leg 15; when it is necessary to fold and store the right rear leg 15, the right leg locking rod 11 is pressed downward, so that its lower end pushes the right hook to rotate downward through the right connecting rod and releases the hook on the right positioning rod, and then the right rear leg 15 is rotated upward to complete the folding and storage.

[0032] like Figure 2 , Figure 8 As shown, a notch is provided on the upper side of the left rear leg 18 near the rear end, and the notch is to prevent the left rear leg 18 from interfering with the protrusion at the upper end of the left stand 1 when the left rear leg 18 is in the folded storage state; an inner gear ring 17.1 is provided on the inner side of the left rear wheel 17, and the left rear wheel 17 is rotatably mounted on the outer side of the rear end of the left rear leg 18, and a long guide groove is provided on the inner rear end of the left rear leg 18, and a left wire tube limit platform 18.3 is provided on the front side of the long guide groove, and the left wire tube limit platform 1 8.3 is provided with a circular hole that passes through from front to back; the front side of the left end of the left brake shoe 34 is provided with arc-shaped teeth, and the right end of the left brake shoe 34 is provided with a left brake shoe slide 34.1, which is installed in the above-mentioned long guide groove and can move forward and backward; the left rear brake spring 33 is installed between the left brake shoe slide 34.1 and the left wire tube limit platform 18.3, so that under the elastic force of the left rear brake spring 33, the left brake shoe 34 always has a tendency to move backward.

[0033] A notch is provided on the upper side of the right rear leg 15 near the rear end, and the notch is for avoiding interference between the right rear leg 15 and the protrusion at the upper end of the right stand 10 when the right rear leg 15 is in the folded storage state; an inner gear ring is provided on the inner side of the right rear wheel 19, and the right rear wheel 19 is rotatably mounted on the outer side of the rear end of the right rear leg 15, and a long guide groove is provided on the inner rear end of the right rear leg 15, and a right wire tube 14 limit platform is provided on the front side of the long guide groove, and a circular hole is provided on the right wire tube 14 limit platform that passes through the front and rear; arc-shaped teeth are provided on the front side of the right end of the right brake shoe, and a right brake shoe slide is provided on the left end of the right brake shoe, and the right brake shoe slide is installed in the above-mentioned long guide groove and can move forward and backward; the right rear brake spring is installed between the right brake shoe slide and the right wire tube 14 limit platform, so that under the elastic force of the right rear brake spring, the right brake shoe always has a tendency to move backward.

[0034] like Figure 3 As shown, the left upper rod 4 is a T-shaped structure, and a left rear handle 4.1 is horizontally arranged on the rear side of its upper end. The left rear handle 4.1 can provide support for the user's left hand in the walking-assisting state, and a left hand brake 5 is fixedly arranged on the lower side of the left rear handle 4.1. A left front handle 4.2 is obliquely arranged downward on the front side of the upper end of the left upper rod 4. When in the wheelchair state, the left front handle 4.2 can be convenient for the accompanying person to hold and push with his right hand. The lower end of the left upper rod 4 is a hollow square rod structure, and a plurality of positioning holes 4.3 are vertically and evenly spaced on the rear side surface of the square rod structure. The square rod structure at the lower end of the left upper rod 4 is installed in the left upper rod slide and can move up and down; the left upper locking rod 26 is coaxially installed in the left upper locking rod cavity 1.5 and constitutes a moving pair , a disc is provided at the rear end of the upper left locking rod 26, which helps the user to pull the upper left locking rod 26 backward by hand; the upper left locking spring 27 is installed at the rear end inside the upper left locking rod cavity 1.5, and under the elastic force of the upper left locking spring 27, the front end of the upper left locking rod 26 is inserted into the corresponding positioning hole 4.3 to achieve position locking of the upper left rod 4; when the height position of the upper left rod 4 needs to be adjusted, only the upper left locking rod 26 needs to be pulled backward to disengage the front end of the upper left locking rod 26 from the positioning hole 4.3. After adjusting the upper left rod 4 to a suitable height position, release the holding of the upper left locking rod 26, so that the front end of the upper left locking rod 26 is inserted into the new corresponding positioning hole 4.3 under the elastic force of the upper left locking spring 27.

[0035] The right upper rod 7 is a T-shaped structure, and a right rear handle is horizontally arranged on the rear side of its upper end. The right rear handle can provide support for the user's right hand when in the walking-assisting state. A right-hand brake 6 is fixedly arranged on the lower side of the right rear handle. A right front handle is obliquely arranged downward on the front side of the upper end of the right upper rod 7. When in the wheelchair state, the right front handle can be convenient for the accompanying person to hold and push with his left hand. The lower end of the right upper rod 7 is a hollow square rod structure, and a plurality of positioning holes are vertically evenly spaced on the rear side surface of the square rod structure. The square rod structure at the lower end of the right upper rod 7 is installed in the right upper rod slide and can move up and down; the right upper locking rod 23 is coaxially installed in the right upper locking rod cavity and constitutes a moving pair. A disc is provided at the rear end of the locking rod 23, which helps the user to pull the upper right locking rod 23 backwards by hand; the upper right locking spring is installed at the rear end inside the upper right locking rod cavity, and under the elastic force of the upper right locking spring, the front end of the upper right locking rod 23 is inserted into the corresponding positioning hole to achieve the position locking of the upper right rod 7; when it is necessary to adjust the height position of the upper right rod 7, it is only necessary to pull the upper right locking rod 23 backwards to disengage the front end of the upper right locking rod 23 from the positioning hole, and after adjusting the upper right rod 7 to a suitable height position, release the holding of the upper right locking rod 23, so that its front end is inserted into the new corresponding positioning hole under the elastic force of the upper right locking spring.

[0036] like Figure 3 , Figure 6 , Figure 8 As shown, the structure of the left wire tube 25 is the same as that of the brake line. The left wire tube 25 is a tubular structure with a certain flexibility, and the left wire tube 25 cannot be compressed in the axial direction. A left pull wire 25.1 runs through the inside of the left wire tube 25. The left pull wire 25.1 can be made of a steel wire rope. A spiral structure is provided at the upper end of the left wire tube 25 to facilitate the extension and contraction of the left wire tube 25. The left wire tube 25 is installed inside the square rod structure of the left upper rod 4, and its upper port is connected to the front end of the left hand brake 5. The lower end of the left wire tube 25 passes downward through the left upper rod slideway and then passes out from the inner side of the lower end of the left stand 1, and then passes through the inner side of the front end of the left rear support leg 18, and then is installed on the front side of the left wire tube limit platform 18.3; the upper end of the left pull wire 25.1 The left end is tightly connected with the lever handle inside the left handbrake 5, and the lower end of the left pull wire 25.1 passes through the lower end of the left wire tube 25, passes through the left wire tube limit platform 18.3 and the left rear brake spring 33 in sequence, and is tightly connected with the left brake block slide 34.1; thereby, by squeezing the left handbrake 5, the left pull wire 25.1 can be pulled to move the left brake block 34 forward, so that the arc-shaped teeth on the front side of the left end of the left brake block 34 mesh with the inner gear ring 17.1, thereby braking the left rear wheel 17; after releasing the pinching of the left handbrake 5, the left rear brake spring 33 pushes the left brake block 34 to move backward and releases the brake on the left rear wheel 17. At the same time, the left pull wire 25.1 pulls the lever handle in the left handbrake 5 to return to its original position.

[0037] The structure of the right wire tube 14 is the same as that of the left wire tube 25, the outer side of which is a tubular structure with certain flexibility, and the right wire tube 14 cannot be compressed in the axial direction, and a right pull wire runs through the inside thereof, and the right pull wire can be made of a steel wire rope, and a spiral structure is provided at the upper end of the right wire tube 14 to facilitate the extension and contraction of the right wire tube 14, and the right wire tube 14 is installed inside the square rod structure of the right upper rod 7, and its upper port is connected to the front end of the right hand brake 6, and its lower end passes downward through the left upper rod slideway and then passes through the inner side of the lower end of the right stand 10, and then passes through the inner side of the front end of the right rear leg 15, and then is installed on the front side of the right wire tube 14 limit platform ; The upper end of the right pull wire is tightly connected to the lever handle inside the right-hand brake 6, and the lower end of the right pull wire passes through the lower end of the right wire tube 14, passes through the right wire tube 14 limit platform, the right rear brake spring in sequence, and is tightly connected to the right brake block slide; thereby pinching the right hand brake 6, the right pull wire can be pulled to move the right brake block forward, so that the arc-shaped teeth on the front side of the right end of the right brake block mesh with the inner gear ring on the right rear wheel 19, thereby braking the right rear wheel 19; after releasing the pinch on the right hand brake 6, the right rear brake spring pushes the right brake block to move backward and releases the brake on the right rear wheel 19. At the same time, the right pull wire pulls the lever handle in the right hand brake 6 to return to its original position.

[0038] Walker status: Figure 1 As shown, the left stand 1 and the right stand 10 are in the unfolded state, the right-hand horizontal bending section of the upper end of the left support rod 21 is inserted into the right semicircular groove on the upper side of the right upper connecting seat, and the left-hand horizontal bending section of the upper end of the right support rod 12 is inserted into the left semicircular groove on the upper side of the left upper connecting seat 1.3, the left rear leg 18 is opened backwards and locked by the left hook 31, the right rear leg 15 is opened backwards and locked by the right hook, the left seat bar 2 and the right seat bar 9 are slid forward and flipped, so that the lower ends of the two are respectively equipped with the left bar limiting rod 1.4 and the front side of the right bar limiting rod to prevent the left seat bar 2 and the right seat bar 9 from swinging during the walking assistance process, the height of the left upper rod 4 and the right upper rod 7 are adjusted according to the user's height and locked by the left upper locking rod 26 and the right upper locking rod 23 respectively; then the user can hold the left rear handle 4.1 with his left hand and the right rear handle with his right hand for assisted walking.

[0039] Wheelchair status: Figure 2As shown, the left stand 1 and the right stand 10 are in the unfolded state, the right horizontal bending section of the upper end of the left support rod 21 is inserted into the right semicircular groove on the upper side of the right upper connecting seat, and the left horizontal bending section of the upper end of the right support rod 12 is inserted into the left semicircular groove on the upper side of the left upper connecting seat 1.3, the left rear leg 18 is opened backwards and locked by the left hook 31, the right rear leg 15 is opened backwards and locked by the right hook, the left seat bar 2 and the right seat bar 9 are slid backwards and turned over, so that the left bar limiting groove 2.2 is inserted into the left support rod 1.2, and the right bar limiting groove is inserted into the right support rod, the left locking button 3 and the right knob are tightened to lock the sliding of the left seat bar 2 and the right seat bar 9 respectively. 8 are all in a horizontal state, the left support rod 1.2 can limit the forward and backward movement of the left seat bar 2, and can prevent the left seat bar 2 from moving left and right, and provide support for the left seat bar 2, the right support rod can limit the forward and backward movement of the right seat bar 9, and can prevent the right seat bar 9 from moving left and right, and provide support for the right seat bar 9, the height of the left upper rod 4 and the right upper rod 7 are adjusted according to the user's sitting height and are locked by the left upper locking rod 26 and the right upper locking rod 23 respectively, the user's arms can be placed on the left rear handle 4.1 and the right rear handle respectively, to improve the riding comfort; then the user can sit on the upper side of the seat cloth 8, and the accompanying person can hold the right front handle with his left hand and the left front handle with his right hand to push the wheelchair to walk.

[0040] The folding and storage principle of the wheelchair: Figure 2 , Fig. 9 As shown, in the wheelchair state, the left upper rod 4 and the right upper rod 7 are moved downward and positioned, and the pull bar 8.1 is pulled upward to lift the middle position of the seat cloth 8 upward, and the two sides of the seat cloth 8 respectively drive the upper ends of the right support rod 12 and the left support rod 21 to be retracted to the middle position, so that the left vertical frame 1 and the right vertical frame 10 are simultaneously moved toward the middle and brought together, the left support leg locking rod 20 is pressed downward to release the lock of the left rear support leg 18, the left rear support leg 18 is rotated upward to realize the storage action of the left rear support leg 18, the right support leg locking rod 11 is pressed downward to release the lock of the right rear support leg 15, the right rear support leg 15 is rotated upward to realize the storage action of the right rear support leg 15, and the seat cloth 8 is pressed downward to fold the seat cloth 8 in the middle position between the left vertical frame 1 and the right vertical frame 10, thereby completing the storage action of the wheelchair.

[0041] The unfolding principle of the wheelchair: Figure 1 , Fig. 9As shown, the left rear leg 18 is rotated downward to lock the left hook 31, the right rear leg 15 is rotated downward to lock the right hook, and the left stand 1 and the right stand 10 are pulled apart to both sides respectively, so that the left support rod 21 and the right support rod 12 are opened, and the right horizontal bending section at the upper end of the left support rod 21 is inserted into the right semicircular groove on the upper side of the right upper connecting seat, and the left horizontal bending section at the upper end of the right support rod 12 is inserted into the left semicircular groove on the upper side of the left upper connecting seat 1.3; thereafter, if the left seat bar 2 and the right seat bar 9 are flipped forward, the walker state can be entered; if the left seat bar 2 and the right seat bar 9 are kept horizontal, the wheelchair state can be entered.

Claims

1. A foldable wheelchair, mainly comprising a left stand, a left upper rod, a left hand brake, a right hand brake, a right upper rod, a right stand, a right support rod, a right rear leg, a left rear wheel, a left rear leg, a right rear wheel, a left support rod, a right curved rod, and a left curved rod, characterized in that: A left upper rod slide with an open upper end is vertically arranged inside the left frame, a left support rod is arranged on the inner side of the upper end of the left frame, and a left positioning rod is arranged on the rear side of the lower end of the left frame; the right frame and the left frame are in a left-right symmetrical structure; the upper end of the left support rod is arranged with a right horizontal bending section, the lower end of the left support rod is rotatably connected to the lower end of the inner side of the left frame, the left end of the right bent rod is rotatably connected to the upper end of the left support rod, and the right end of the right bent rod is rotatably connected to the upper end of the inner side of the right frame; the upper end of the right support rod is arranged with a left horizontal bending section, the lower end of the right support rod is rotatably connected to the lower end of the inner side of the right frame, the left end of the left bent rod is rotatably connected to the upper end of the inner side of the left frame, and the right end of the left bent rod is rotatably connected to the upper end of the right support rod; the middle position of the left support rod is rotatably connected to the middle position of the right support rod through a pin shaft; the left slider is connected to the left The left guide rail on the lower side of the left seat bar is installed in cooperation with the left slider to form a moving pair, a left limiting groove is arranged on the left side of the left seat bar, the right slider is rotatably connected to the right horizontal bending section, the right guide rail on the lower side of the right seat bar is installed in cooperation with the right slider to form a moving pair, and a right limiting groove is arranged on the right side of the right seat bar; the front end of the left rear leg is rotatably connected to the lower end of the left upright frame, and the rear end of the left hook is rotatably connected to the left hook rotating shaft; the left leg locking rod is installed inside the front end of the left rear leg and can move up and down, the lower end of the left leg locking rod is rotatably connected to the middle position of the left hook through the left connecting rod, and the left leg locking spring is coaxially installed with the left leg locking rod; the right rear leg and related connecting parts form a left-right symmetrical structure with the left rear leg and related connecting parts. The right rear leg is rotatably connected to the right upright and locked by the right hook; the left rear wheel is rotatably installed on the outer side of the rear end of the left rear leg, and a long guide groove is provided on the inner rear end of the left rear leg, and a left wire tube limit platform is provided on the front side of the long guide groove, and an arc-shaped tooth is provided on the front side of the left end of the left brake block, and the left brake block is installed in the above-mentioned long guide groove and can move forward and backward, and the left rear brake spring is installed between the left brake block slide and the left wire tube limit platform; the right rear wheel and its related brake components are symmetrical with the left rear wheel and its related brake components, and the right rear wheel is rotatably installed on the outer side of the rear end of the right rear leg; a left rear handle is horizontally provided on the rear side of the upper end of the left upper rod, and a left hand brake is provided on the lower side of the left rear handle, and a left front handle is provided on the front side of the upper end of the left upper rod, and the lower end of the left upper rod is a hollow square rod structure. The square rod structure at the lower end of the left upper rod is installed in the left upper rod slide and can move up and down and be positioned; the right upper rod and the left upper rod are in a left-right symmetrical structure, the upper end of the right upper rod is provided with a right hand brake, and the right upper rod is installed on the upper end of the right stand and can move up and down and be positioned; a left pull wire runs through the left wire tube, the left wire tube is installed inside the square rod structure of the left upper rod, its upper end is connected with the front end of the left hand brake, and its lower end is installed on the front side of the left wire tube limit platform, the upper end of the left pull wire is tightly connected with the lever handle inside the left hand brake, and the lower end of the left pull wire is tightly connected with the left brake block after passing through the lower end of the left wire tube, and the left hand brake realizes the braking of the left rear wheel through the left pull wire; the right wire tube has the same structure as the left wire tube, a right pull wire runs through the right wire tube, and the right hand brake realizes the braking of the right rear wheel through the right pull wire.

2. A foldable wheelchair according to claim 1, characterized in that: The left front caster and the right front caster are both universal wheel structures.

3. A foldable wheelchair according to claim 1, characterized in that: A threaded hole is transversely arranged on the left side of the left slider, and a left locking button is installed in the threaded hole to form a thread pair.

4. A foldable wheelchair according to claim 1, characterized in that: The seat cloth is made of coarse canvas material, and a draw bar is provided on the upper side of the seat cloth.

5. A foldable wheelchair according to claim 1, characterized in that: The left upper locking rod is installed on the rear side of the upper end of the left stand, and the left upper locking rod can move forward and backward to achieve locking and unlocking of the left upper rod.

6. A foldable wheelchair according to claim 1, characterized in that: A notch is provided on the upper side of the left rear leg near the rear end, and the notch is used to prevent the left rear leg from interfering with the protrusion at the upper end of the left stand when the left rear leg is in a folded storage state.

7. A foldable wheelchair according to claim 1, characterized in that: The left wire tube is a tubular structure with certain flexibility, and the left wire tube cannot be compressed in the axial direction. The upper end of the left wire tube is provided with a spiral structure.

8. The foldable wheelchair according to claim 1, characterized in that: A plurality of positioning holes are vertically and evenly spaced on the rear side surface of the square rod structure at the lower end of the left upper rod.

9. The foldable wheelchair according to claim 1, characterized in that: An inner gear ring is arranged on the inner side of the left rear wheel.

10. The foldable wheelchair according to claim 1, characterized in that: The front end of the left hook is provided with a hook-shaped structure, and the front end of the hook-shaped structure is provided with a guiding inclined surface.

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