Folding wheelchair

Abstract

The utility model relates to the technical field of wheelchairs, in particular to a folding wheelchair capable of being folded downwards, which is provided with a movable chassis, a chair seat and a chair back, the chair seat is supported on the movable chassis by a folding support, the folding support comprises a front upper support rod, a front lower support rod, a rear inclined support rod and a cross rod, the lower end of the front lower supporting rod is hinged to the movable chassis, the upper end of the rear inclined supporting rod is hinged to the back face of the chair seat, the lower end of the rear inclined supporting rod is hinged to the movable chassis, and the lower end of the front upper supporting rod and the upper end of the front lower supporting rod are hinged at a first hinge point. The folding wheelchair is further provided with an electric device for driving the first hinge point to move back and forth to conduct electric folding, or the folding wheelchair is further provided with a locking device to conduct manual folding, and the folding support enables the seat of the wheelchair to be good in stability and strong in bearing capacity. During electric folding, the electric push rod bears bearing force on the folding support and only plays an auxiliary role.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, in particular to a foldable wheelchair which can be folded downwards. Background Art

[0002] A wheelchair is a kind of manned tool with wheels added to a chair. As a means of transportation for people with lower limb disabilities, it can be divided into electric and manual wheelchairs.

[0003] As society pays more attention to people with disabilities, more and more people who use wheelchairs to travel participate in various social activities. In order to facilitate users to carry them, more and more foldable wheelchairs have appeared, so that wheelchairs can be easily stored in vehicles and airplanes. It is also because of this kind of travel that the folding process of the wheelchair is required to be quick and convenient.

[0004] Chinese patent publication number CN212816833U discloses a novel foldable wheelchair, which has a movable chassis, a seat and a backrest. The seat is folded toward the movable chassis and the backrest is folded toward the seat by a first folding mechanism and a second folding mechanism, both of which are four-link structures. The advantage is that the wheelchair can be switched from an open state to a folded state, or from a folded state to an open state, with a single operation, and is easy to operate. However, the disadvantage is that when the wheelchair is opened for use, the support of the seat is mainly achieved by an electric push rod, which may cause the wheelchair to have insufficient stability and weak carrying capacity. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a folding wheelchair to overcome the problems of insufficient stability and weak bearing capacity of the existing folding wheelchairs.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a folding wheelchair comprises a mobile chassis, a seat and a seat back, the seat is supported by a folding bracket and is arranged on the mobile chassis, the folding bracket comprises a front upper support rod, a front lower support rod, a rear oblique support rod and a cross rod, the upper end of the front upper support rod is hinged to the back of the seat, the lower end of the front lower support rod is hinged to the mobile chassis, the upper end of the rear oblique support rod is hinged to the back of the seat, the lower end of the rear oblique support rod is hinged to the mobile chassis, the lower end of the front upper support rod and the upper end of the front lower support rod are hinged at a first hinge point, the front end of the cross rod is hinged to the front upper support rod, and the rear end is hinged to the rear oblique support rod. The folding wheelchair also has an electric device for driving the first hinge point to move forward and backward, when the electric device drives the first hinge point to be positioned in the front, the folding bracket is propped up, and when the electric device drives the first hinge point to be positioned in the rear, the folding bracket is folded.

[0007] Specifically, the rear oblique support rod is a forward-leaning support at the upper end. There are two sets of folding supports, which are arranged at intervals on the left and right. The first hinge points of the two sets of folding supports are connected by a folding axis. The folding axis also serves as the hinge axis of the first hinge points of the front upper support rod and the front lower support rod. The electric device drives the folding axis to move forward and backward to prop up and fold the folding support.

[0008] Specifically, the backrest is hinged on the seat, and the folding wheelchair also has a folding device for driving the backrest to swing forward and fold toward the seat, and the folding device is linked with the folding bracket; the structure of the folding device and the linkage between the folding device and the folding bracket is that the folding device includes a push-back rod, the front end of the push-back rod is hinged on the cross bar, and the rear end is hinged on the backrest, and the hinge point between the backrest and the push-back rod is lower than the hinge point between the backrest and the seat.

[0009] Specifically, the electric device is an electric push rod, and the movable end and the fixed end of the electric push rod are respectively arranged on the folding shaft and the movable chassis.

[0010] Specifically, an opening angle limiting structure is provided between the upper front support rod and the lower front support rod, between the upper front support rod and the seat, and / or between the lower front support rod and the movable chassis, for limiting the upper front support rod and the lower front support rod that are in a straight line when the upper front support rod and the lower front support rod are opened to 180 degrees; or, for limiting the upper front support rod and the lower front support rod when the upper front support rod and the lower front support rod are opened to more than 180 degrees, and the opening angle of the upper front support rod and the lower front support rod is greater than 180 degrees and less than 190 degrees.

[0011] Specifically, the front upper support rod and the front lower support rod are U-shaped brackets with an opening facing forward and a cross-section thereof being U-shaped, the U-shaped bracket being composed of a groove bottom plate and side plates on both sides of the groove bottom plate, the lower end of the front upper support rod and the upper end of the front lower support rod being hinged together by a hinge shaft in an inside-outside nested manner through the opening facing forward; the specific structure of the opening angle limiting structure between the front upper support rod and the front lower support rod is: the groove bottom plate of the front upper support rod and the front lower support rod overlapping front and back at a first hinge point, or the specific structure of the opening angle limiting structure between the front upper support rod and the front lower support rod is: a limiting block extending from the groove bottom plate and a limiting groove on the groove bottom plate, the limiting block and the limiting groove being respectively located on the groove bottom plate of the front upper support rod and the front lower support rod overlapping front and back at the first hinge point, the limiting block being embedded in the limiting groove, to limit the opening angle of the front upper support rod and the front lower support rod.

[0012] Specifically, the front upper support rod and the front lower support rod are U-shaped brackets with an opening facing forward and a U-shaped cross-section. The U-shaped bracket is composed of a groove bottom plate and side plates on both sides of the groove bottom plate. The lower end of the front upper support rod and the upper end of the front lower support rod are hinged together through an articulation axis in an inside-outside nesting manner through the opening facing forward; there is also an assist tension spring between the front upper support rod and the front lower support rod, and the assist tension spring is located in the U-shaped groove intersecting the front upper support rod and the front lower support rod, and its upper end is fixed on the front upper support rod and its lower end is fixed on the front lower support rod, and the assist tension spring is located between the groove bottom of the U-shaped groove and the articulation axis of the first hinge point. When the front upper support rod and the front lower support rod are transformed from a folded state to an opened state, the assist tension spring contracts, and assists the front upper support rod and the front lower support rod to open through tension.

[0013] The above is an electric folding wheelchair. Under the same inventive idea, the utility model also provides a mechanical folding wheelchair, which comprises a mobile chassis, a seat and a backrest. The seat is supported by a folding bracket and is arranged on the mobile chassis. The folding bracket comprises a front upper support rod, a front lower support rod, a rear oblique support rod and a cross rod. The upper end of the front upper support rod is hinged to the back of the seat, the lower end of the front lower support rod is hinged to the mobile chassis, the upper end of the rear oblique support rod is hinged to the back of the seat, the lower end of the rear oblique support rod is hinged to the mobile chassis, the lower end of the front upper support rod and the upper end of the front lower support rod are hinged at a first hinge point, the front end of the cross rod is hinged to the front upper support rod, and the rear end is hinged to the rear oblique support rod. The folding wheelchair also has a locking device, which is locked after the folding bracket is propped up to keep the folding wheelchair in an open state.

[0014] Specifically, the rear oblique support rod is a forward-leaning support rod at the upper end, and there are two sets of folding supports, which are arranged at intervals on the left and right. The first hinge points of the two sets of folding supports are connected by a folding axis, and the folding axis also serves as the hinge axis of the first hinge points of the front upper support rod and the front lower support rod.

[0015] Specifically, the backrest is hinged on the seat, and the folding wheelchair also has a folding device for driving the backrest to swing forward and fold toward the seat, and the folding device is linked with the folding bracket; the structure of the folding device and the linkage between the folding device and the folding bracket is that the folding device includes a push-back rod, the front end of the push-back rod is hinged on the cross bar, and the rear end is hinged on the backrest, and the hinge point between the backrest and the push-back rod is lower than the hinge point between the backrest and the seat.

[0016] Specifically, an opening angle limiting structure is provided between the upper front support rod and the lower front support rod, between the upper front support rod and the seat, and / or between the lower front support rod and the movable chassis, for limiting the upper front support rod and the lower front support rod that are in a straight line when the upper front support rod and the lower front support rod are opened to 180 degrees; or, for limiting the upper front support rod and the lower front support rod when the upper front support rod and the lower front support rod are opened to more than 180 degrees, and the opening angle of the upper front support rod and the lower front support rod is greater than 180 degrees and less than 190 degrees.

[0017] Specifically, the front upper support rod and the front lower support rod are U-shaped brackets with an opening facing forward and a cross-section thereof being U-shaped, the U-shaped bracket being composed of a groove bottom plate and side plates on both sides of the groove bottom plate, the lower end of the front upper support rod and the upper end of the front lower support rod being hinged together by a hinge shaft in an inside-outside nested manner through the opening facing forward; the specific structure of the opening angle limiting structure between the front upper support rod and the front lower support rod is: the groove bottom plate of the front upper support rod and the front lower support rod overlapping front and back at a first hinge point, or the specific structure of the opening angle limiting structure between the front upper support rod and the front lower support rod is: a limiting block extending from the groove bottom plate and a limiting groove on the groove bottom plate, the limiting block and the limiting groove being respectively located on the groove bottom plate of the front upper support rod and the front lower support rod overlapping front and back at the first hinge point, the limiting block being embedded in the limiting groove, to limit the opening angle of the front upper support rod and the front lower support rod.

[0018] Specifically, the front upper support rod and the front lower support rod are U-shaped brackets with an opening facing forward and a U-shaped cross-section. The U-shaped bracket is composed of a groove bottom plate and side plates on both sides of the groove bottom plate. The lower end of the front upper support rod and the upper end of the front lower support rod are hinged together through an articulation axis in an inside-outside nesting manner through the opening facing forward; there is also an assist tension spring between the front upper support rod and the front lower support rod, and the assist tension spring is located in the U-shaped groove intersecting the front upper support rod and the front lower support rod, and its upper end is fixed on the front upper support rod and its lower end is fixed on the front lower support rod, and the assist tension spring is located between the groove bottom of the U-shaped groove and the articulation axis of the first hinge point. When the front upper support rod and the front lower support rod are transformed from a folded state to an opened state, the assist tension spring contracts, and assists the front upper support rod and the front lower support rod to open through tension.

[0019] Specifically, the locking device includes a lock seat, a torsion spring, a torsion spring lock hook and a lock rod. The lock seat is fixed on the back of the chair back, the lock rod is horizontal and fixed on the push-back rod, the upper end of the torsion spring lock hook is hinged on the lock seat, and the lower end of the torsion spring lock hook has a working part extending forward and hooked on the lock rod and a handle part extending backward. One end of the torsion spring abuts on the lock seat and the other end abuts on the torsion spring lock hook, tending to make the lower end of the torsion spring lock hook swing forward and hook the lock rod. External force acts on the handle part to overcome the torsion spring torsion force and make the working part separate from the lock rod to the release state of the locking device. When the locking device is released, the folding device and the folding bracket can be folded.

[0020] The beneficial effects of the utility model are as follows: the folding wheelchair of the utility model not only makes the folding process of the wheelchair quick and convenient, but also arranges the folding bracket into a roughly figure eight shape, and the support of the seat can be realized by dispersed four-point support, so that the seat of the wheelchair has good stability and strong bearing capacity; the folding wheelchair can be folded electrically or manually, and when folded electrically, the bearing force of the seat can be borne by the folding bracket, and the electric push rod only plays an auxiliary role in the bearing force of the folding bracket, so the seat has a larger bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 This is a three-dimensional diagram of the electric structure of the utility model in the opened state;

[0023] Figure 2 It is a three-dimensional diagram of the folded state of the electric structure of the utility model;

[0024] Figure 3 This is a front view of the electric structure of the utility model in the opened state;

[0025] Figure 4 This is a front view of the electric structure of the utility model in a folded state;

[0026] Figure 5 This is a three-dimensional diagram of the utility model showing the opening state of the booster spring;

[0027] Figure 6 yes Figure 5 A magnified image of point A;

[0028] Figure 7 This is a three-dimensional diagram of the utility model showing the folded state of the booster spring;

[0029] Figure 8 yes Figure 7 The enlarged view of point B;

[0030] Fig. 9 This is a three-dimensional diagram of the manual structure of the utility model in the opened state;

[0031] Fig.10 yes Fig. 9 Enlarged view of point C;

[0032] Fig.11 yes Fig. 9 The enlarged view of point D;

[0033] Fig.12 This is the front view of the manual structure of the utility model in the open state;

[0034] Fig.13 yes Fig.12 Enlarged view of point E.

[0035] In the figure: 1. Chair seat;

[0036] 2. Chair back;

[0037] 3. Bottom frame;

[0038] 4. Folding bracket, 4-1. Front upper support rod, 4-2. Front lower support rod, 4-3. Rear oblique support rod, 4-4. First hinge point, 4-5. Crossbar;

[0039] 5. Folding device, 5-1. Push back rod;

[0040] 6. Folding axis;

[0041] 7. Electric push rod;

[0042] 8. Assist tension spring;

[0043] 9. Limit block;

[0044] 10. Limiting groove;

[0045] 11. Locking device, 11-1. Lock seat, 11-2. Torsion spring, 11-3. Lock hook, 11-4. Lock rod. DETAILED DESCRIPTION

[0046] The present invention will now be further described in detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0047] In order to clearly show the structure of the present invention, the cushions on the seat 1 and the backrest 2 are omitted in the attached drawings.

[0048] Embodiment 1, attached Figures 1 to 8 The utility model is a structure in which the folding process is completed by an electric device. A folding wheelchair comprises a mobile chassis, a seat 1 and a seat back 2. The mobile chassis comprises a bottom frame 3 and wheels mounted on the bottom frame 3. The seat 1 is supported by a folding bracket 4 and is arranged on the bottom frame 3. The seat back 2 is hinged on the seat 1. The folding wheelchair also has a folding device 5 for driving the seat back 2 to swing forward and fold toward the seat 1. The folding device 5 is linked with the folding bracket 4. The folding bracket 4 comprises a front upper support rod 4-1, a front lower support rod 4-2, and a rear oblique support rod 4-3. Rod 4-3 and cross bar 4-5, the upper end of the front upper support rod 4-1 is hinged on the back of the seat 1, the lower end of the front lower support rod 4-2 is hinged on the bottom frame 3, the upper end of the rear oblique support rod 4-3 is hinged on the back of the seat 1, the lower end of the rear oblique support rod 4-3 is hinged on the bottom frame 3, the rear oblique support rod 4-3 is an upper end forward tilting bracket, the lower end of the front upper support rod 4-1 and the upper end of the front lower support rod 4-2 are hinged at the first hinge point 4-4, the front end of the cross bar 4-5 is hinged on the front upper support rod 4-1, and the rear end is hinged on the rear oblique support rod 4-3.

[0049] There are two sets of folding brackets 4, which are arranged at intervals on the left and right. The first hinge points 4-4 of the two sets of folding brackets 4 are connected by a folding shaft 6, and the folding shaft 6 also serves as the hinge axis of the first hinge points 4-4 of the front upper support rod 4-1 and the front lower support rod 4-2;

[0050] The folding wheelchair has an electric device for driving the folding shaft 6 to move forward and backward. When the electric device drives the folding shaft 6 to be positioned in the front, the folding bracket 4 is propped up. When the electric device drives the folding shaft 6 to be positioned in the rear, the folding bracket 4 is folded.

[0051] The folding device 5 and the structure in which the folding device 5 is linked with the folding bracket 4 are that the folding device 5 includes a push-back rod 5-1, the front end of which is hinged on the cross bar 4-5, and the rear end is hinged on the chair back 2, and the hinge point between the chair back 2 and the push-back rod 5-1 is lower than the hinge point between the chair back 2 and the seat 1, that is, there are two high and low hinge points on the chair back 2.

[0052] There are two sets of folding brackets 4, and correspondingly, there are also two sets of folding devices 5, which are arranged at intervals on the left and right.

[0053] The electric device is an electric push rod 7, and the movable end and fixed end of the electric push rod 7 are respectively arranged on the folding shaft 6 and the bottom frame 3. Because the folding device 5 is linked with the folding bracket 4, when the electric push rod 7 drives the folding bracket 4 to open or fold, the folding device 5 is also linked to open or fold, thereby driving the chair back 2 to open or fold.

[0054] The front upper support rod 4-1 and the front lower support rod 4-2 are U-shaped brackets with a U-shaped cross section opening forward. The U-shaped bracket is composed of a groove bottom plate and side plates on both sides of the groove bottom plate. This U-shaped structure can improve strength and reduce component weight.

[0055] An opening angle limiting structure is provided between the front upper support rod 4-1 and the front lower support rod 4-2, which is used for limiting the front upper support rod 4-1 and the front lower support rod 4-2 which are in a straight line when the front upper support rod 4-1 and the front lower support rod 4-2 are opened to 180 degrees; the lower end of the front upper support rod 4-1 and the upper end of the front lower support rod 4-2 are hinged together through an opening facing forward in an inside-outside nested manner through a hinge axis; the specific structure of the opening angle limiting structure between the front upper support rod 4-1 and the front lower support rod 4-2 is: a limiting block extending from the groove bottom plate and a limiting groove on the groove bottom plate, the limiting block and the limiting groove are respectively located on the groove bottom plate where the front upper support rod 4-1 and the front lower support rod 4-2 overlap front and back at the first hinge point 4-4, the limiting block is embedded in the limiting groove, and the opening angle of the front upper support rod 4-1 and the front lower support rod 4-2 is limited.

[0056] There is also an assisting tension spring 8 between the front upper support rod 4-1 and the front lower support rod 4-2. The assisting tension spring 8 is located in a U-shaped groove intersecting the front upper support rod 4-1 and the front lower support rod 4-2, and its upper end is fixed on the front upper support rod 4-1, and its lower end is fixed on the front lower support rod 4-2. The assisting tension spring 8 is located between the bottom of the U-shaped groove and the folding axis 6. When the front upper support rod 4-1 and the front lower support rod 4-2 are transformed from a folded state to an open state, the assisting tension spring 8 contracts, and assists the front upper support rod 4-1 and the front lower support rod 4-2 to open through tension.

[0057] The electric folding and opening process of the folding wheelchair of this embodiment 1 is as follows:

[0058] The folding and opening are completed by the electric push rod 7. When the electric push rod 7 is pushed out, the folding bracket 4 and the folding device 5 are activated, the seat 1 rises, and the backrest 2 opens. When the electric push rod 7 is retracted, the seat 1 falls, and the backrest 2 is folded.

[0059] When the folding bracket 4 is opened, the front upper support rod 4-1 and the front lower support rod 4-2 are opened to 180 degrees, and the front upper support rod 4-1 and the front lower support rod 4-2 are in a straight line, and the load-bearing force of the seat 1 can be borne by the folding bracket 4, and the electric push rod 7 only plays an auxiliary role in the load-bearing force of the folding bracket 4, so the seat 1 has a large load-bearing capacity. However, in the prior art described in the background technology, the load-bearing force of the seat 1 is borne by the electric push rod 7, and the safety of the wheelchair completely depends on the self-locking function of the electric push rod 7, which is very risky.

[0060] Embodiment 2, as Figures 9 to 13 As shown, a folding wheelchair is folded manually.

[0061] The structure of the folding wheelchair of the second embodiment is substantially the same as that of the first embodiment, except that the electric push rod is removed, but a locking device 11 is additionally provided.

[0062] The locking device 11 includes a lock seat 11-1, a torsion spring 11-2, a lock hook 11-3 and a lock rod 11-4. The lock seat 11-1 is fixed on the back of the chair back, and the lock rod 11-4 is horizontally fixed on the push-back rod 5-1. The upper end of the lock hook 11-3 is hinged on the lock seat 11-1, and the lower end of the lock hook 11-3 has a working part extending forward and hooked on the lock rod 11-4 and a handle part extending backward. One end of the torsion spring 11-2 abuts on the lock seat 11-1 and the other end abuts on the lock hook 11-3, tending to make the lower end of the lock hook 11-3 swing forward and hook the lock rod 11-4. The external force acting on the handle part overcomes the torsion of the torsion spring 11-2 and can make the working part disengage from the lock rod 11-4 to the released state of the locking device. When the locking device is released, the folding device 5 and the folding bracket 4 can be folded.

[0063] The locking rod 11 - 4 is specifically installed on the locking rod seat, and is fixed to the push-back rods 5 - 1 on both sides through the seat rod of the locking rod seat.

[0064] Of course, the locking device 11 can be replaced by a locking device 11 of other structures of a manually foldable wheelchair in the prior art.

[0065] The manual folding and opening process of the folding wheelchair of this embodiment 2 is as follows:

[0066] When folding, first release the locking device 11, manually push the folding shaft 6 backward, and the folding bracket 4 overcomes the tension of the auxiliary tension spring to start folding, and then press the seat 1 or the backrest 2 to make the folding bracket 4 and the folding device 5 continue to fold, and finally complete the folding of the folding wheelchair.

[0067] When opening, just hold the seat 1 with both hands and lift it up hard, the auxiliary tension spring 8 between the front upper support rod 4-1 and the front lower support rod 4-2 will shrink, and the upper front support rod 4-1 and the front lower support rod 4-2 will be fully straightened through the tension force, the folding bracket 4 will be fully opened, the seat 1 will rise, and the folding device 5 linked with the folding bracket 4 will also be fully opened, thereby completing the rotation and opening of the chair back 2.

[0068] In the embodiments 1 and 2 of the present invention, it is not excluded that there is only one set of the folding bracket 4 and the folding device 5;

[0069] In the embodiment 1 of the present invention, the folding wheelchair is driven to prop up and fold by the electric push rod 7, and it is not excluded that the booster spring 8 is omitted;

[0070] In the embodiments 1 and 2 of the present invention, it is not excluded that an opening angle limiting structure is provided between the front upper support rod 4-1 and the seat and / or between the front lower support rod 4-2 and the movable chassis, so as to limit the front upper support rod 4-1 and the front lower support rod 4-2 which are in a straight line when the front upper support rod 4-1 and the front lower support rod 4-2 are opened to 180 degrees;

[0071] In embodiments 1 and 2 of the present invention, it is not excluded that the opening angle limiting structure limits the front upper support rod 4-1 and the front lower support rod 4-2 when they are opened to over 180 degrees, and the opening angle of the front upper support rod 4-1 and the front lower support rod 4-2 is greater than 180 degrees and less than 190 degrees. After the front upper support rod 4-1 and the front lower support rod 4-2 are opened to over 180 degrees, the front upper support rod 4-1 and the front lower support rod 4-2 are limited.

[0072] In the embodiments 1 and 2 of the present invention, it is not excluded that the seat back 2 is not folded, but is directly fixed to the seat 1, and accordingly, the folding device 5 is no longer needed.

[0073] With the above-mentioned ideal embodiment of the utility model as inspiration, through the above-mentioned description content, relevant staff can make various changes and modifications without departing from the scope of the technical idea of ​​the utility model. The technical scope of the utility model is not limited to the contents in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A folding wheelchair, comprising a mobile chassis, a seat (1) and a seat back (2), wherein the seat (1) is supported by a folding bracket (4) and arranged on the mobile chassis, wherein: The folding bracket (4) comprises a front upper support rod (4-1), a front lower support rod (4-2), a rear oblique support rod (4-3) and a cross rod (4-5); the upper end of the front upper support rod (4-1) is hinged to the back of the seat (1); the lower end of the front lower support rod (4-2) is hinged to the moving chassis; the upper end of the rear oblique support rod (4-3) is hinged to the back of the seat (1); the lower end of the rear oblique support rod (4-3) is hinged to the moving chassis; the lower end of the front upper support rod (4-1) and the upper end of the front lower support rod (4-2) are hinged at a first hinge point (4-4); the front end of the cross rod (4-5) is hinged to the front upper support rod (4-1) and the rear end is hinged to the rear oblique support rod (4-3); The folding wheelchair also has an electric device for driving the first hinge point (4-4) to move forward and backward. When the electric device drives the first hinge point (4-4) to be positioned in the front, the folding bracket (4) is propped up. When the electric device drives the first hinge point (4-4) to be positioned in the rear, the folding bracket (4) is folded.

2. The folding wheelchair according to claim 1, characterized in that: The rear oblique support rod (4-3) is a forward-leaning support at the upper end; There are two sets of folding brackets (4), which are arranged at intervals on the left and right. The first hinge points (4-4) of the two sets of folding brackets (4) are connected by a folding shaft (6). The folding shaft (6) also serves as the hinge shaft of the first hinge points (4-4) of the front upper support rod (4-1) and the front lower support rod (4-2). The electric device drives the folding shaft (6) to move forward and backward to prop up and fold the folding bracket (4).

3. The folding wheelchair according to claim 1, characterized in that: The backrest (2) is hinged on the seat (1), and the folding wheelchair also has a folding device (5) for driving the backrest (2) to swing forward and fold toward the seat (1), and the folding device (5) is linked with the folding bracket (4); The folding device (5) and the structure in which the folding device (5) and the folding bracket (4) are linked are that the folding device (5) comprises a push back rod (5-1), the front end of the push back rod (5-1) is hinged on the cross bar (4-5), and the rear end is hinged on the chair back (2), and the hinge point between the chair back (2) and the push back rod (5-1) is lower than the hinge point between the chair back (2) and the seat (1).

4. The folding wheelchair according to claim 2, characterized in that: The electric device is an electric push rod (7), and the movable end and the fixed end of the electric push rod (7) are respectively arranged on the folding shaft (6) and the movable chassis.

5. The folding wheelchair according to claim 1 or 2, characterized in that: An opening angle limiting structure is provided between the front upper support rod (4-1) and the front lower support rod (4-2), between the front upper support rod (4-1) and the seat, and / or between the front lower support rod (4-2) and the movable chassis, for limiting the front upper support rod (4-1) and the front lower support rod (4-2) that are in a straight line when the front upper support rod (4-1) and the front lower support rod (4-2) are opened to 180 degrees; Alternatively, it is used to limit the front upper support rod (4-1) and the front lower support rod (4-2) when they are opened to more than 180 degrees, and the opening angle of the front upper support rod (4-1) and the front lower support rod (4-2) is greater than 180 degrees and less than 190 degrees.

6. The folding wheelchair according to claim 5, characterized in that: The front upper support rod (4-1) and the front lower support rod (4-2) are U-shaped brackets with a U-shaped cross section and an opening facing forward. The U-shaped bracket is composed of a groove bottom plate and side plates on both sides of the groove bottom plate. The lower end of the front upper support rod (4-1) and the upper end of the front lower support rod (4-2) are hinged together through the opening facing forward in an inner-outer nesting manner through a hinge shaft. The specific structure of the opening angle limiting structure between the front upper support rod (4-1) and the front lower support rod (4-2) is as follows: the front upper support rod (4-1) and the front lower support rod (4-2) overlap each other at the first hinge point (4-4). Alternatively, the specific structure of the opening angle limiting structure between the front upper support rod (4-1) and the front lower support rod (4-2) is: a limiting block extending from the groove bottom plate and a limiting groove on the groove bottom plate, the limiting block and the limiting groove are respectively located on the groove bottom plates where the front upper support rod (4-1) and the front lower support rod (4-2) overlap front and rear at the first hinge point (4-4), and the limiting block is embedded in the limiting groove to limit the opening angle of the front upper support rod (4-1) and the front lower support rod (4-2).

7. The folding wheelchair according to claim 1 or 2, characterized in that: The front upper support rod (4-1) and the front lower support rod (4-2) are U-shaped brackets with a U-shaped cross section and an opening facing forward. The U-shaped bracket is composed of a groove bottom plate and side plates on both sides of the groove bottom plate. The lower end of the front upper support rod (4-1) and the upper end of the front lower support rod (4-2) are hinged together through the opening facing forward in an inner-outer nesting manner through a hinge shaft. A booster tension spring (8) is also provided between the front upper support rod (4-1) and the front lower support rod (4-2). The booster tension spring (8) is located in a U-shaped groove intersecting the front upper support rod (4-1) and the front lower support rod (4-2), and its upper end is fixed on the front upper support rod (4-1) and its lower end is fixed on the front lower support rod (4-2). The booster tension spring (8) is located between the groove bottom of the U-shaped groove and the hinge axis of the first hinge point (4-4). When the front upper support rod (4-1) and the front lower support rod (4-2) are transformed from a folded state to an opened state, the booster tension spring (8) contracts, and assists the front upper support rod (4-1) and the front lower support rod (4-2) to open through a pulling force.

8. A folding wheelchair, comprising a mobile chassis, a seat (1) and a seat back (2), wherein the seat (1) is supported by a folding bracket (4) and arranged on the mobile chassis, wherein: The folding bracket (4) comprises a front upper support rod (4-1), a front lower support rod (4-2), a rear oblique support rod (4-3) and a cross rod (4-5); the upper end of the front upper support rod (4-1) is hinged to the back of the seat (1); the lower end of the front lower support rod (4-2) is hinged to the moving chassis; the upper end of the rear oblique support rod (4-3) is hinged to the back of the seat (1); the lower end of the rear oblique support rod (4-3) is hinged to the moving chassis; the lower end of the front upper support rod (4-1) and the upper end of the front lower support rod (4-2) are hinged at a first hinge point (4-4); the front end of the cross rod (4-5) is hinged to the front upper support rod (4-1) and the rear end is hinged to the rear oblique support rod (4-3); The folding wheelchair also has a locking device (11), which is locked after the folding bracket (4) is propped up, so as to keep the folding wheelchair in an open state.

9. The folding wheelchair according to claim 8, characterized in that: The rear oblique support rod (4-3) is a forward-leaning support at the upper end; There are two sets of folding brackets (4), which are arranged at intervals on the left and right. The first hinge points (4-4) of the two sets of folding brackets (4) are connected by a folding axis (6), and the folding axis (6) also serves as the hinge axis of the first hinge points (4-4) of the front upper support rod (4-1) and the front lower support rod (4-2).

10. The folding wheelchair according to claim 8, characterized in that: The backrest (2) is hinged on the seat (1), and the folding wheelchair also has a folding device (5) for driving the backrest (2) to swing forward and fold toward the seat (1), and the folding device (5) is linked with the folding bracket (4); The folding device (5) and the structure in which the folding device (5) and the folding bracket (4) are linked are that the folding device (5) comprises a push back rod (5-1), the front end of the push back rod (5-1) is hinged on the cross bar (4-5), and the rear end is hinged on the chair back (2), and the hinge point between the chair back (2) and the push back rod (5-1) is lower than the hinge point between the chair back (2) and the seat (1).

11. The folding wheelchair according to claim 8 or 9, characterized in that: An opening angle limiting structure is provided between the front upper support rod (4-1) and the front lower support rod (4-2), between the front upper support rod (4-1) and the seat, and / or between the front lower support rod (4-2) and the movable chassis, for limiting the front upper support rod (4-1) and the front lower support rod (4-2) that are in a straight line when the front upper support rod (4-1) and the front lower support rod (4-2) are opened to 180 degrees; Alternatively, it is used to limit the front upper support rod (4-1) and the front lower support rod (4-2) when they are opened to more than 180 degrees, and the opening angle of the front upper support rod (4-1) and the front lower support rod (4-2) is greater than 180 degrees and less than 190 degrees.

12. The folding wheelchair according to claim 11, characterized in that: The front upper support rod (4-1) and the front lower support rod (4-2) are U-shaped brackets with a U-shaped cross section and an opening facing forward. The U-shaped bracket is composed of a groove bottom plate and side plates on both sides of the groove bottom plate. The lower end of the front upper support rod (4-1) and the upper end of the front lower support rod (4-2) are hinged together through the opening facing forward in an inner-outer nesting manner through a hinge shaft. The specific structure of the opening angle limiting structure between the front upper support rod (4-1) and the front lower support rod (4-2) is as follows: the front upper support rod (4-1) and the front lower support rod (4-2) overlap each other at the first hinge point (4-4). Alternatively, the specific structure of the opening angle limiting structure between the front upper support rod (4-1) and the front lower support rod (4-2) is: a limiting block extending from the groove bottom plate and a limiting groove on the groove bottom plate, the limiting block and the limiting groove are respectively located on the groove bottom plates where the front upper support rod (4-1) and the front lower support rod (4-2) overlap front and rear at the first hinge point (4-4), and the limiting block is embedded in the limiting groove to limit the opening angle of the front upper support rod (4-1) and the front lower support rod (4-2).

13. The folding wheelchair according to claim 8 or 9, characterized in that: The front upper support rod (4-1) and the front lower support rod (4-2) are U-shaped brackets with a U-shaped cross section and an opening facing forward. The U-shaped bracket is composed of a groove bottom plate and side plates on both sides of the groove bottom plate. The lower end of the front upper support rod (4-1) and the upper end of the front lower support rod (4-2) are hinged together through the opening facing forward in an inner-outer nesting manner through a hinge shaft. A booster tension spring (8) is also provided between the front upper support rod (4-1) and the front lower support rod (4-2). The booster tension spring (8) is located in a U-shaped groove intersecting the front upper support rod (4-1) and the front lower support rod (4-2), and its upper end is fixed on the front upper support rod (4-1) and its lower end is fixed on the front lower support rod (4-2). The booster tension spring (8) is located between the groove bottom of the U-shaped groove and the hinge axis of the first hinge point (4-4). When the front upper support rod (4-1) and the front lower support rod (4-2) are transformed from a folded state to an opened state, the booster tension spring (8) contracts, and assists the front upper support rod (4-1) and the front lower support rod (4-2) to open through a pulling force.

14. The folding wheelchair according to claim 9, characterized in that: The locking device (11) comprises a lock seat (11-1), a torsion spring (11-2), a lock hook (11-3) and a lock rod (11-4); the lock seat (11-1) is fixed on the back of the chair back; the lock rod (11-4) is horizontal and fixed on the back push rod (5-1); the upper end of the lock hook (11-3) is hinged on the lock seat (11-1); the lower end of the lock hook (11-3) has a working portion extending forward and hooked on the lock rod (11-4); A handle portion extends backwards, one end of the torsion spring (11-2) abuts against the lock seat (11-1) and the other end abuts against the lock hook (11-3), tending to make the lower end of the lock hook (11-3) swing forward to hook the lock rod (11-4), and an external force acts on the handle portion to overcome the torsion of the torsion spring (11-2), so that the working part can be separated from the lock rod (11-4) to a released state of the locking device, and when the locking device (11) is released, the folding device (5) and the folding bracket (4) can be folded.

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