WO2022252886A1

WO2022252886A1 - Foldable wheelchair and folding method therefor

Info

Publication number: WO2022252886A1
Application number: PCT/CN2022/089459
Authority: WO
Inventors: 杨扬
Original assignee: 上海酷哲动力系统有限公司
Priority date: 2021-06-04
Filing date: 2022-04-27
Publication date: 2022-12-08
Also published as: CN115429555A

Abstract

A foldable wheelchair (800), comprising a cushion assembly (80), a front wheel assembly (10), and a rear wheel assembly (20). The upper end of the front wheel assembly (10) and the upper end of the rear wheel assembly (20) are rotatably connected to a front connecting position (P1) and a rear connecting position (P2) of the cushion assembly (80), respectively. The foldable wheelchair (800) further comprises a first driving assembly (100). A first movable member (101) is arranged on the cushion assembly (80) in a forward-backward moving manner, the two ends of a first connecting arm (102) are respectively hinged to the first movable member (101) and a first party of the front wheel assembly (10) and the rear wheel assembly (20), and a first driving unit (103) is used for driving the first movable member (101) to move front and back, such that the first party is rotatably unfolded or folded relative to the cushion assembly (80) under the driving action of the first connecting arm (102). Also provided is a folding method for the foldable wheelchair (800). The foldable wheelchair (800) and the folding method can achieve automatic folding of a wheelchair.

Description

Folding wheelchair and its folding method

technical field

The invention provides a folding wheelchair and a folding method for the folding wheelchair.

Background technique

In recent decades, the large-scale world peace and the development of medical technology have made countries around the world gradually enter the aging society. Assistive travel equipment for the elderly with inconvenient legs and feet has also developed along the trend. After years of development, there are basically two forms, one One is a scooter, and the other is an electric wheelchair. The scooter has three or four wheels. It uses a handle similar to a bicycle to control the forward direction. It has a large radius of maneuver and is difficult to operate indoors. It is almost only suitable for outdoor use. Folding scooter almost has no handrails and no lateral support. It is not safe enough for the elderly, and the hand has to hold the handle all the time to operate the direction, and it is easy to get tired. The wheelchair uses a joystick to control the direction, and the radius of gyration is small, which is suitable for indoor and outdoor operation. At present, there are basically two methods of folding electric wheelchairs on the market. The first is that the two sides of the wheelchair are folded inward, and the seat cushion needs to be removed manually before folding. (If there is any need to disassemble, most of the seats without cushions are a layer of soft fabric, which is very uncomfortable, and the backrest is all soft fabric, without good lumbar support); the second is to use multiple sets of connecting rods These two methods can achieve the purpose of folding the wheelchair and reduce the volume during transportation and storage. After years of development, the existing two solutions have almost reached their limits. The first solution above is simple to operate but The folding method can only reduce the width, and the volume is larger after folding. Although it is not comfortable enough, it is easy to operate, does not need to bend over, has a simple structure and is cheap, and there is still a part of the market; the above-mentioned second solution can reduce both length and height after folding Although the folding volume is smaller than the first solution, and because of the design of the soft seat and backrest, the comfort level is much better than the first one, but most of the products require the user to bend over to operate, and the user needs to There are many folding steps involved, which is very unfriendly to the elderly or disabled people who need wheelchairs to travel. At present, some manufacturers have introduced an independent electric actuator on the basis of this structure to automate part of the folding process. Although such changes It can reduce the inconvenience of the user's operation, but at the same time it also increases the weight of the electric actuator, and the volume also increases to a certain extent.

The present invention intends to provide an automatically foldable folding wheelchair and an automatically foldable folding method for the folding wheelchair.

Contents of the invention

The purpose of the present invention is to provide a folding wheelchair which can realize automatic folding.

Another object of the present invention is to provide a folding method that can realize automatic folding of the wheelchair.

The present invention provides a folding wheelchair, comprising a cushion assembly, a front wheel assembly and a rear wheel assembly, the upper ends of the front wheel assembly and the rear wheel assembly are respectively rotatably connected to the front connection position and the rear connection position of the seat cushion assembly, wherein the folding wheelchair It also includes a first drive assembly, the first drive assembly includes: a first movable part, which can be movably arranged on the seat cushion assembly; the first party; and the first driving unit, which is used to drive the first movable part to move back and forth, whereby the first party can be rotatably unfolded or folded relative to the cushion assembly under the action of the first connecting arm.

The present invention also provides a folding method for a folding wheelchair. The folding wheelchair includes a cushion assembly, a front wheel assembly and a rear wheel assembly. In the state where the rear rollers are supported on the supporting surface, the first side of the front wheel assembly and the rear wheel assembly is turned and folded toward the seat cushion assembly around the first rotation axis until the first side is horizontally supported on the first middle of the supporting surface. Up to state C17, wherein the first axis of rotation is set at the connection between the first party and the cushion assembly; from the first intermediate state C17, under the state that the first party is horizontally supported on the support surface, the seat cushion assembly rotates around the second A rotation axis is rotated and unfolded relative to the first side, and at the same time, the second side of the front wheel assembly and the rear wheel assembly is rotated and folded relative to the seat cushion assembly around the second rotation axis until the seat cushion assembly is close to the position of the first rotation axis Up to the first folded state C20 where the end is supported on the support surface, wherein the second axis of rotation is set at the junction of the second side and the cushion assembly; from the first folded state C20, the end of the seat cushion assembly is supported on the support In the state on the surface, the first party is rotated and folded to the second folded state C23 toward the cushion assembly around the first rotation axis.

The above-mentioned folding wheelchair can drive the front wheel assembly or the rear wheel assembly to fold relative to the seat cushion assembly through the connecting arm through the drive unit to drive the movable parts to move back and forth, which can realize automatic folding. Moreover, during the folding process, especially in step S2 of the above-mentioned folding method, the connecting arms can play an auxiliary supporting role for the entire seat cushion assembly and the rear wheel assembly.

In the above folding method, after the front wheel assembly is rotated and folded to a predetermined angle relative to the seat cushion assembly, the rear wheel assembly is rotated and folded relative to the seat cushion assembly while the seat cushion assembly is unfolded relative to the front wheel assembly, so as to realize the adjustment of the center of gravity of the wheelchair. Automated folding is done with user assistance.

Figure overview

Concrete feature of the present invention, performance are further provided by following embodiment and accompanying drawing thereof.

Figure 1 is a perspective view of an exemplary folding wheelchair according to the present invention.

Figure 2 is an exploded view of an exemplary folding wheelchair.

Figure 3 is a partially exploded view of an exemplary folding wheelchair.

4A is a side view of an exemplary front wheel assembly in one posture.

4B is a perspective view of the pedal assembly in the posture of FIG. 4A.

5A and 5B are side and perspective views, respectively, of an exemplary front wheel assembly in another attitude.

6 is a side view of the exemplary front wheel assembly in yet another attitude.

Fig. 7A and Fig. 7B are respectively perspective views of the arm rest assembly in a fully opened normal use state viewed from two angles.

FIG. 8A and FIG. 8B are perspective views of the arm rest assembly in a fully folded storage state viewed from two angles.

FIGS. 9A and 9B are side views schematically showing the armrest assembly when the armrest folding assembly is in two intermediate states, wherein the intermediate state in FIG. 9B is closer to the folded state than the intermediate state in FIG. 9A .

Fig. 10A, Fig. 10B and Fig. 10C are schematic diagrams exemplarily showing the upside-down of the armrest. In Fig. 10A, the lock hook hooks the hinge shaft and the armrest folding assembly is in the unfolded state. In Fig. 10B, the lock hook breaks away from the hinge shaft and the armrest is folded The assembly is in the unfolded state. In FIG. 10C , the lock hook is disengaged from the hinge shaft and the armrest folding assembly is in the folded state.

Fig. 11A, Fig. 11B and Fig. 11C are schematic diagrams exemplarily showing the armrest locking assembly. The armrest locking assembly is in a locked state in Fig. 11A, is in an unlocked state in Fig. 11B, and is in another unlocked state in Fig. 11C .

Fig. 12 is a schematic diagram exemplarily showing the cooperation of the backrest locking assembly and the backrest assembly.

Fig. 13 is a schematic diagram exemplarily showing an unlocking component.

Fig. 14 is a schematic diagram exemplarily showing the cooperation between the unlocking component and the locking support. .

Fig. 15 is another schematic diagram exemplarily showing the cooperation of the backrest locking assembly and the backrest assembly.

Fig. 16A, Fig. 16B and Fig. 16C are respectively schematic diagrams exemplarily showing the backrest assembly in the backrest unfolded position, the backrest middle position and the backrest folded position.

Fig. 17 is a schematic diagram exemplarily showing that the backrest assembly is in the unfolded position of the handle.

Fig. 18 is a schematic diagram exemplarily showing that the folding wheelchair is in the trunk mode.

Fig. 19A to Fig. 19C are schematic diagrams showing state changes of an exemplary folding process of the manipulation assembly of the folding wheelchair. In Fig. 19A, the folding wheelchair is in a fully unfolded state.

FIG. 19D is a schematic view showing the unlocking operation of the armrest lock assembly of the folding wheelchair after the state of FIG. 19C .

19E to 19H are schematic diagrams showing state changes of an exemplary folding process of folding the armrest assembly of the wheelchair after the state of FIG. 19D .

Fig. 19I to Fig. 19K are schematic diagrams showing state changes of an exemplary folding process of the cushion of the backrest assembly of the wheelchair after the state of Fig. 19H is folded.

FIGS. 19L to 19V are state transition diagrams illustrating an exemplary folding process of folding the leg assembly of the wheelchair after the state of FIG. 19K .

Fig. 20 is a schematic diagram exemplarily showing that the folding wheelchair is in a fully folded state after the state of Fig. 19V.

Fig. 21A to Fig. 21I schematically show the state changes of the exemplary unfolding process of the leg assembly of the folding wheelchair, wherein Fig. 21A shows the state after being unfolded from Fig. 20 .

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be further described below in conjunction with specific embodiments and accompanying drawings. In the following description, more details are set forth in order to fully understand the present invention, but the present invention can obviously be implemented in a variety of other ways different from this description, Those skilled in the art can make similar promotions and deductions based on actual application situations without violating the connotation of the present invention, so the content of this specific implementation manner should not limit the protection scope of the present invention.

For example, the description that the first feature described later in the specification is formed on or above the second feature may include the embodiment in which the first feature and the second feature are formed through direct contact, and may also include an embodiment in which the first feature and the second feature are formed. Embodiments in which additional features are formed, so that there may be no direct connection between the first feature and the second feature. Further, when the first element is described as being connected or combined with the second element, the description includes the embodiment in which the first element and the second element are directly connected or combined with each other, and also includes the use of one or more other intervening elements Joining indirectly connects or joins a first element and a second element to each other.

The following will exemplarily describe the folding wheelchair and the folding method of the folding wheelchair according to the present invention.

1. Folding wheelchair 800

FIG. 1 and FIG. 2 show an exemplary overall structure of the folding wheelchair 800 , wherein FIG. 1 is a perspective view of the folding wheelchair 800 , and FIG. 2 is an exploded schematic view of the folding wheelchair 800 . Each part will be described exemplarily below. It should be understood that the accompanying drawings are all examples only, and should not be construed as limiting the actual protection scope of the present invention.

Referring to FIGS. 1 and 2 , a folding wheelchair 800 may include a cushion assembly 80 . It can be understood that the cushion assembly 80 can provide a cushion 802 for the user to sit on, and the cushion assembly 80 can also include a cushion support 801 supporting the cushion 802 , and the cushion support 801 can also be called the main frame of the folding wheelchair 800 . In the illustrated embodiment, the folding wheelchair 800 may include a front wheel assembly 10, a rear wheel assembly 20, and may also include a backrest assembly 30, a hand arm assembly 40, and the like.

For the convenience of description, spatial relation words such as "lower", "upper", "front", "rear", "left", "right" and so on may be used herein to describe an element or feature shown in the drawings and Relationships to other components or features. It can be understood that the directions herein are all described with reference to the normal use state (as shown in FIG. 19A ) in which the folding wheelchair 800 is fully unfolded everywhere for the user to sit on. For example, the "side" can be the user's Left or right, "Up", "Down", "Front", "Back", etc. are also referred to at this time. In FIG. 19A , the folding wheelchair 800 is supported by the front roller 11 and the rear roller 21 on the support surface G0 , such as the ground. In addition, unless otherwise stated, extending along a specific direction herein does not require strictly following the definition in the mathematical sense, but requires that the extending direction has a component in the specific direction. Preferably, the angle between the extending direction and the specific direction is less than 45°. It is to be understood that these spatially relative terms are intended to encompass other orientations of the element or component in use or operation than the orientation depicted in the figures. For example, if the components in the figures are turned over, particularly in the case where the folding wheelchair 800 of the present invention can be folded, the orientation of elements described as being "under" other elements or features would instead be oriented "below" the other elements or features. Or the feature "upper", for example, during the folding process of the folding wheelchair 800 of the present invention, the parts located on the front side will become located on the lower side. Therefore, the spatial relationship descriptors used in the text should be interpreted accordingly.

1. Chair leg assembly

The folding wheelchair 800 may include a front wheel assembly 10 and a rear wheel assembly 20 . In the illustrated embodiment, the upper ends of the front wheel assembly 10 and the rear wheel assembly 20 are respectively rotatably connected to the front connection position P1 and the rear connection position P2 of the seat cushion assembly 80 . It can be understood that the "front connection position P1" and "rear connection position P2" here are relative to each other, which means that in the aforementioned normal use state (or, fully unfolded state), the front connection position P1 is connected at the rear Bit P2 precedes or post-connects bit P2 after pre-connecting bit P1.

The front wheel assembly 10 and the rear wheel assembly 20 may be collectively referred to as a chair leg assembly. It is understood that it does not exclude that the chair wheel assembly may include other components.

It can be understood that the front wheel assembly 10 includes the front rollers 11 of the folding wheelchair 800 , for example, two front rollers 11 located on the left and right sides in FIG. 1 . The front wheel assembly 10 may also include a front wheel frame 12 supporting the front rollers 11 , and the front wheel assembly 10 may be rotatably connected to the cushion assembly 80 through the upper end of the front wheel frame 12 . The front wheel frame 12 can also be referred to as a front outrigger or a front chair leg, and a front fork 122 connected by a suspension 121 can rollably support the front roller 11 . The front wheel assembly 10 can be switched between the front wheel unfolded position P121 (as shown in FIG. 19K ) and the front wheel folded position P122 (as shown in FIG. 20 ) by the front wheel frame 12 rotating relative to the seat cushion assembly 80 . The included angle α12 between the front wheel frame 12 and the cushion assembly 80 is shown in FIG. For example, it can be at -10-10°.

The rear wheel assembly 20 includes the rear rollers 21 of the folding wheelchair 800 , for example, the two rear rollers 21 on the left and right sides in FIG. 1 . The rear wheel assembly 10 may further include a rear wheel frame 22 supporting the rear rollers 21 , and the rear wheel assembly 20 may be rotatably connected to the cushion assembly 80 through the upper end of the rear wheel frame 22 . The rear wheel frame 22 can also be referred to as a rear outrigger or a rear chair leg, and is, for example, dog-leg-shaped, and its lower end supports the rear roller 21 in a rolling manner.

It can be understood that specific words are used herein to describe embodiments of the present invention, such as "one embodiment", "an embodiment" and/or "another embodiment" means a certain aspect related to at least one embodiment of the present invention. Characteristic, structure or characteristic. Therefore, it should be emphasized and noted that "an embodiment" or "an embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics of one or more embodiments of the present invention may be properly combined. In addition, the use of words such as "first" and "second" to define parts is only for the convenience of distinguishing corresponding parts. If there is no other statement, the above words have no special meaning, so they cannot be understood as protection of the present invention. Scope limitation.

In the illustrated embodiment, the chair leg assembly may further include a driving device, and the driving device may drive the front wheel assembly 10 and/or the rear wheel assembly 20 to rotate relative to the seat cushion assembly 80 to fold or unfold.

Each part of the chair leg assembly will be exemplarily described below.

1.1. Driving device

The drive device may include a first drive assembly 100 and/or a second drive assembly 200, which are respectively used to drive the first party (the front wheel assembly 10 is taken as an example) and/or the second party in the front wheel assembly 10 and the rear wheel assembly 20 respectively. side (the rear wheel assembly 20 is taken as an example in the text). The driving device will be exemplarily described below with reference to FIGS. 1 to 3 .

The first driving assembly 100 may include a first movable member 101 and a first connecting arm 102 . The first movable part 101 is movably disposed on the cushion assembly 80 back and forth. As mentioned above, front and back are relative to the normal use state in Fig. 19A. During the folding process, the "back and forth movement" of the first movable part 101 becomes the movement towards obliquely upward or diagonally downward. Two ends of the first connecting arm 102 are respectively hinged to the first movable member 101 and the aforementioned first party (in the illustrated embodiment, the front wheel assembly 10 ). The first movable part 101 moves back and forth, whereby the front wheel assembly 10 (as an example of the aforementioned first party) drives the first connecting arm 102 through the first movable part 101 to rotate and unfold or fold relative to the seat cushion assembly 80 .

The first driving assembly 100 may also include a first driving unit 103, which is used to drive the first movable member 101 to move back and forth, whereby the front wheel assembly 10 (as an example of the aforementioned first party) is driven by the first connecting arm 102 The bottom is rotatable to expand or fold relative to the cushion assembly 80 . In the illustrated embodiment, the first drive unit 103 can be, for example, a rotary drive source (eg, a rotary motor) that can output rotary motion, and the rotary drive source can drive the first movable member 101 to move back and forth through a screw drive mechanism. The screw drive mechanism may include a first screw 105 and (for example, two) first slide rods 106, the first movable member 101 may be threadedly connected to the first screw 105, and threaded through the first slide rods 106, Therefore, the rotary drive source of the first drive unit 103 outputs rotary motion, which drives the first screw mandrel 105 to rotate, and the first movable member 101 can slide back and forth under the guidance of the first slide bar 106. Driven by the connecting arm 102 , the seat cushion assembly 80 is rotated and unfolded or folded.

The second driving assembly 200 may include a second movable member 201 and a second connecting arm 202 . The second movable part 201 is movably disposed on the cushion assembly 80 back and forth. Both ends of the second connecting arm 202 are respectively hinged to the second movable member 201 and the aforementioned second party (in the illustrated embodiment, the rear wheel assembly 20 ). The second movable part 201 moves back and forth, whereby the rear wheel assembly 20 (as an example of the aforementioned second party) drives the second connecting arm 202 through the second movable part 201 to rotate and unfold or fold relative to the seat cushion assembly 80 .

The second driving assembly 200 may also include a second driving unit 203, which is used to drive the second movable member 201 to move back and forth, whereby the rear wheel assembly 20 (as an example of the aforementioned second party) is driven by the second connecting arm 202 The bottom can be folded or unfolded relative to the seat cushion assembly 80 by rotation. In the illustrated embodiment, the second drive unit 203 can be, for example, a rotary drive source (eg, a rotary motor) that can output rotary motion, and the rotary drive source can drive the second movable member 201 to move back and forth through a screw drive mechanism. The screw drive mechanism may include a second screw rod 205 and (for example, two) second slide rods 206, the second movable member 201 may be threadedly connected to the second screw rod 205, and threaded through the second slide rod 206, Therefore, the rotary drive source of the second drive unit 203 outputs rotary motion, which drives the second screw mandrel 205 to rotate, and the second movable member 201 can slide back and forth under the guidance of the second slide bar 206. Driven by the connecting arm 202 , the seat cushion assembly 80 is rotated and folded or unfolded.

In the illustrated embodiment, the cushion assembly 80 may include a lower guide rod 104 and an upper guide rod 204 . The lower guide rod 104 can be regarded as the first screw rod 105 and/or the first slide rod 106 . The upper guide rod 204 can be regarded as the second screw rod 205 and/or the second slide rod 206 . Both the lower guide rod 104 and the upper guide rod 204 extend forward and backward and are arranged at the middle position of the seat cushion assembly 80 in the left-right direction. The first movable part 101 is movably arranged on the lower guide rod 104 forward and backward, and the second movable part 201 is arranged on the upper guide rod 204 movably back and forth. This arrangement is beneficial to free up space on the left and right sides of the lower guide bar 104 and the upper guide bar 204 for arranging the folded front wheel assembly 10 and rear wheel assembly 20 of the folding wheelchair 800 , thus making it more compact as a whole.

In the illustrated embodiment, the driving device of the folding wheelchair 800 may further include a position detection unit (not shown) for detecting the movement position of the first movable part 101 and/or the second movable part 201 . The position detection unit may be, for example, a position sensor. For example, in the illustrated embodiment, three proximity sensors may be included for the first movable part 101 to respectively detect whether the first movable part 101 has moved to both ends and the middle position. For another example, it may Two proximity sensors are included for the second movable part 201, respectively detecting whether the second movable part 201 moves to the two ends.

The driving device of the folding wheelchair 800 can also include a controller (not shown), which can transmit a control signal to the first driving unit 103 and/or the second driving unit 203 based on the motion position detected by the aforementioned position detection unit, such as to make it Stop driving, reverse driving or variable speed driving, etc., the specific control signals will be described in detail later. The controller includes one or more hardware processors such as microcontrollers, microprocessors, reduced instruction set computers (RISCs), application specific integrated circuits (ASICs), application specific instruction integrated processors (ASIPs), central processing units (CPUs) ), graphics processing unit (GPU), physical processing unit (PPU), microcontroller unit, digital signal processor (DSP), field programmable gate array (FPGA), advanced RISC machine (ARM), programmable logic device ( PLD), any circuit or processor capable of performing one or more functions, or a combination of one or more of them.

The driving device can also include a remote control handle, which can transmit control signals to the controller. The drive unit may also include a rechargeable battery pack to provide electrical power to other components of the drive unit.

1.2. Front wheel assembly 10

In the illustrated embodiment, the front wheel assembly 10 may further include a pedal assembly 50 . The following will exemplarily describe the pedal assembly 50 with reference to FIGS. 3 to 6 and in conjunction with FIGS. 1 and 2 .

In the illustrated embodiment, the pedal assembly 50 may include a foot pedal assembly 51 . The pedal assembly 51 may include a pedal arm 52 and a pedal 53. The upper end of the pedal arm 52 can be rotatably disposed on the front wheel frame 12 , that is, the pedal arm 52 can rotate relative to the front wheel frame 12 . A pedal 53 may be connected to a lower end of the pedal arm 52 . In the illustrated embodiment, the foot pedal 53 may have a connection portion 531 and may be rotatably connected to (the lower end of) the pedal arm 52 via the connection portion 531 .

In the illustrated embodiment, the pedal assembly 50 may further include a rolling wheel 54 disposed on the pedal assembly 51 . The rolling wheels 54 can be configured to roll and contact the support surface G0 during the rotation and folding process of the front wheel frame 12 of the front wheel assembly 10 relative to the seat cushion assembly 80, as shown in FIG. 19M and FIG. 19N , which will be further described later. . It can be understood that it is not required that the rolling wheels 54 are always in rolling contact with the support surface G0 during the entire process of the front wheel frame 12 being rotated and folded relative to the seat cushion assembly 80 , but may be in rolling contact with the support surface G0 during at least a period of time during this process. For example, before switching from the state of FIG. 19K to the state of FIG. 19L, the front wheel frame 12 of the front wheel assembly 10 is rotated and folded relative to the seat cushion assembly 80, however, the pedal assembly 50 as a whole does not contact the supporting surface G0, until in FIG. 19L , the front end of the pedal 53 of the pedal assembly 50 first contacts the support surface G0. In other words, the rolling wheel 54 is configured to be in a position closer to contact with the supporting surface G0 relative to the connecting portion 531 and/or the pedal arm 52 during the folding process of the pedal assembly 50 . In the embodiments shown in FIGS. 19M to 20 , when the pedal assembly 50 is in any state, the scroll wheel 54 is in a position closer to the contact surface G0 relative to the connecting portion 531 , the pedal arm 52 and even the front wheel frame 12 . Therefore, during the folding process, it is avoided that the connecting portion 531 , the pedal arm 52 or the front wheel frame 12 and the support surface G0 are directly worn, which may cause damage to the support surface G0 or the components of the folding wheelchair 800 . In the illustrated embodiment, the scroll wheel 54 is arranged at the junction of the pedal arm 52 and the pedal 53 of the pedal assembly 51, and the scroll wheel 54 is relative to the rolling center of the pedal assembly 51 and the junction of the pedal 53 ( 531) is consistent with respect to the center of rotation of the pedal arm 52, for example, the connecting portion 531) of the rolling wheel 54, the pedal 53 and the pedal arm 52 are worn through the same hinge H51.

As mentioned above, the front wheel assembly 10 is the aforementioned first party, which can be driven by the first drive assembly 100 to rotate and fold relative to the seat cushion assembly 80 . By adopting the above-mentioned pedal assembly 50, during the process of turning and folding the front wheel assembly 10, which will be described in detail later, relative to the seat cushion assembly 80, the rolling wheel 54 can roll forward on the supporting surface G0, driving the pedal arm 52 to move forward relative to the front wheel assembly 80. When the wheel frame 12 is rotated and unfolded, not only the expanded and folded state between the pedal arm 52 and the pedal 53 in the pedal assembly 50 can be changed, which facilitates subsequent folding. In this process, the pedal assembly 50 can be supported by the rolling friction of the rolling wheel 54 surface G0, so as to reduce the friction and wear generated between the parts of the folding wheelchair 800 and the ground, and also play an auxiliary supporting role.

In the illustrated embodiment, the pedal arm 52 may be provided with a mounting hole 521 whose cross section has an elongation direction L52. In other words, the cross section of the installation hole 521 is shaped with an elongation direction L52, such as a strip hole or a rectangular hole, and the elongation direction L52 can also be called the length direction of the cross section of the installation hole 521 . The installation hole 521 may be opened through the pedal arm 52 as shown in the figure. It can be understood that the extension direction L52 of the installation hole 521 mentioned here can be considered as the extension direction of the maximum inner diameter of the installation hole 521 in the plane where the side wall of the pedal arm 52 is located (the paper surface of FIG. 4A ).

As mentioned above, the pedal 53 can be rotatably connected to the pedal arm 52 through the connecting portion 531, whereby the pedal 53 can rotate relative to the pedal arm 52 to the first pedal unfolded position P531 for the user to step on, As shown in Figure 4A and Figure 4B. 4A is a side view of the front wheel assembly 10 when the pedal 53 is at the first pedal deployment position P531 relative to the pedal arm 52, and FIG. 4B is when the pedal 53 is at the first pedal deployment position P531 relative to the pedal arm 52. A perspective view of the pedal assembly 50 . That is, the relative positional relationship between the pedal arm 52 and the pedal 53 can be adjusted by rotating the connecting portion 531 , for example, the pedal 53 can rotate relative to the pedal arm 52 to the first pedal deployment position P531 . The connection part 531 may also have a deployment fitting part 531a for locking the pedal 53 in the first pedal deployment position P531 relative to the pedal arm 52, which will be described later.

In the illustrated embodiment, the pedal assembly 50 may further include a limiting device 55 . The limiting device 55 may include a limiting rod 56 and a limiting elastic member 57 . The limiting rod 56 can movably pass through the installation hole 521 of the pedal arm 52 along the extension direction L52 of the installation hole 521 . The elastic force of the limiting elastic member 57 has a tendency to move the limiting rod 57 to abut against the side wall of the mounting hole 521 along the elongation direction L52, whereby the limiting rod 57 cooperates with the unfolded matching portion 531a of the connecting portion 531 , so that the pedal 53 remains at the first pedal deployment position P531 relative to the pedal arm 52 . In the first pedal unfolded position P531, for example, the included angle α53 between the pedal 53 and the pedal arm 52 can be, for example, 105° to 135°, including the endpoint values. The pedal unfolded state in which the arm 52 is located is more convenient for the user to place the foot on the pedal 53 .

In the illustrated embodiment, the pedal 53 can be configured to be rotatable relative to the pedal arm 52 to the pedal retracted position P532, as shown in FIGS. 5A and 5B . 5A is a side view of the front wheel assembly 10 when the pedal 53 is in the pedal retracted position P532 relative to the pedal arm 52, and FIG. 5B is a front wheel assembly 10 when the pedal 53 is in the pedal retracted position P532 relative to the pedal arm 52. Perspective view of assembly 10. In the pedal retracted position P532, for example, the included angle α53 between the pedal 53 and the pedal arm 52 can be 85-95°, for example, the pedal 53 and the pedal where the pedal arm 52 is located within the range of the included angle The folded state makes the pedal assembly 50 easier to fold and store, and is also beneficial to the folding process of the folding wheelchair 800 which will be described in detail later.

In the embodiment shown in FIG. 4A and FIG. 4B , the pedal 53 is in the first pedal deployment position P531 relative to the pedal arm 52, and when the pedal assembly 50 is assembled in the folding wheelchair 800, it is in the first pedal deployment position. The pedal arm 52 and the footrest 53 of the P531 are suitable for users to place their feet on the footrest 53 , as shown in FIGS. 19A to 19K for example. In the embodiment shown in FIGS. 5A and 5B , the pedal 53 is at the pedal retracted position P532 relative to the pedal arm 52 , and when the pedal assembly 50 is assembled in the folding wheelchair 800 , the pedal arm at the pedal retracted position P532 52 and the pedal 53 will take up a relatively small space, which is convenient for storage and transportation, as shown in Figure 20.

The limiting device 55 may further include a limiting member 58 . The limiter 58 can be connected with the limiter 56 and is rotatably arranged on the pedal arm 52, for example, through the hinge H58. The connection part 531 also has a retractable matching part 531b. When the pedal 53 is located at the pedal retracted position P532 Next, the limiting member 58 cooperates with the retractable matching portion 531b of the connecting portion 531, so that the pedal 53 is kept at the pedal retracted position P532.

In the illustrated embodiment, the limiting rod 56 is assembled on the pedal arm 52 through the mounting hole 521 . In the assembled state, the limiting rod 56 is arranged through the pedal arm 52 and has a protruding end after passing through the pedal arm 52 . At the same time, the installation hole 521 can be in the shape of a long hole, and the shape is set so that the limit rod 56 installed on the pedal arm 52 can move along the elongation direction L52 of the installation hole 521. The elongation direction L52 is supported by the limit elastic member 57, so that in the illustrated embodiment, the elastically supported limit rod 56 is elastically pressed against one side of the installation hole 521 in the elongation direction L52 in the installation hole 521. at the side walls. For example, in the illustrated embodiment, the limiting elastic member 57 can be disposed in the pedal arm 52 , which is easy to ensure that the limiting elastic member 57 does not interfere with other components during the movement of the limiting rod 56 . It can be understood that, in another embodiment, the limiting elastic member 57 may also be disposed outside the pedal arm 52 . In the illustrated embodiment, the limiting elastic member 57 can be a compression coil spring, and the two ends are respectively connected to the limiting rod 56 and the pedal arm 52. When a force is applied to the limiting rod 56, the limiting elastic member 57 can be elastically compressed , the limit rod 56 moves from the aforementioned side wall of the installation hole 521 in the elongation direction L52 toward the other side wall in the elongation direction L52. At the same time, during the movement, the limit elastic member 57 makes the limit The positioning rod 56 always maintains a tendency to move towards the aforementioned side wall. It can be understood that, in another embodiment, the limiting elastic member 57 may also be a tension spring.

The limiting member 58 and the connecting portion 531 of the pedal 53 are located on the same side of the pedal arm 52. Specifically, in the illustrated embodiment, the limiting member 58 and the connecting portion 531 are located on the opposite outer side of the pedal arm 52 in the assembled state. Location. It can be understood that, in another embodiment, the limiting member 58 and the connecting portion 531 may also be located at a relatively inner side of the pedal arm 52 in an assembled state. Wherein, the limiting member 58 can rotate relative to the pedal arm 52 and is connected with the limiting rod 56 . As can be seen in Fig. 4B, the limiting member 58 can be provided with a connecting hole 580, and the limiting rod 56 is passed through the connecting hole 580. When the limiting rod 56 moves in the installation hole 521 along its elongation direction L52, it can drive the limiting The positioning member 58 moves, so that the limiting member 58 rotates around the joint with the pedal arm 52 (hinge axis H58 in the figure) as the rotation center.

4A and 4B shown in the first foot pedal unfolded position P531, the limit rod 56 of the limit device 55 is elastically supported by the limit elastic member 57 and is matched with the expansion matching portion 531a of the connecting portion 531 of the pedal 53 connected, so that the limit rod 56 and the deployment matching portion 531a jointly limit the relative rotation between the pedal arm 52 and the foot pedal 53, specifically, the elastically supported connection means that when the limit rod 56 and the deployment matching portion 531a is in a position-limited state, the position-limiting elastic member 57 elastically supports the position-limiting rod 56, and is in contact with the unfolding matching portion 531a in this elastically supported state. For example, when the position-limiting rod 56 cooperates with the expansion matching portion 531a to limit the position, the compression coil spring as the position-limiting elastic member 57 may be in a state of being slightly elastically compressed, so as to elastically push against the position-limiting rod 56 toward the deployment matching portion 531a. the trend of. A force is applied to the limit rod 56, so that the limit elastic member 57 is further elastically compressed, thereby allowing the disengagement state between the limit rod 56 and the deployment matching portion 531a, and allowing the relative movement between the pedal arm 52 and the pedal 53. turn. In the illustrated embodiment, the connecting portion 531 may be disposed at one end of the limiting rod 56 after passing through the pedal arm 52 , and cooperate with this end to limit the position. In another embodiment, the connecting portion 531 can also be disposed inside the pedal arm 52 and cooperate with the shaft of the limiting rod 56 to limit the position.

In the stowed pedal position P532 shown in FIGS. 5A and 5B , the stopper 58 of the stopper 55 cooperates with the retractable matching portion 531b of the connecting portion 531 of the pedal 53 to limit the pedal 53 and the pedal. Relative rotation between the arms 52. Apply force to the limit rod 56, so that the limit rod 56 moves along the elongation direction L52 of the mounting hole 521, and the mating state is released between the limit rod 56 and the unfolding matching portion 531a. At this time, the pedal 53 and the pedal The arms 52 can be rotated relative to each other until they move to the pedal retracted position P532 shown in Fig. 5A and Fig. 5B. The position in the hole 521 is fixed, and the stopper 58 will not rotate with the connection between it and the pedal arm 52 (in the figure, the hinge H58) as the center of rotation, thus ensuring that no matter where the pedal 53 is relative to the pedal arm 52 along any direction. Rotating in one direction, the limiting member 58 abuts against the retractable matching portion 531b, so as to maintain the pedal 53 at the pedal retracted position P532 relative to the pedal arm 52 .

In the above-mentioned pedal assembly 50, a matching connecting portion 531, a stop member 58 and a stop rod 56 are set. The adjustment limit of the relative positional relationship between 52 is easy to operate, and can provide a good foundation for realizing the automatic folding of the folding wheelchair 800 .

As mentioned above, the upper end of the pedal arm 52 can be rotatably arranged on the front wheel frame 12, thus, the pedal arm 52 can be arranged to be rotatably folded relative to the front wheel frame 12 to the pedal folded position P522.

In the illustrated embodiment, the front wheel frame 12 may include a force application portion 123, for example, the force application portion 123 may be in the form of a crimp. In the stowed position P522 of the pedals, the force application portion 123 of the front wheel frame 12 can apply force to the limit rod 56, so that the limit rod 56 overcomes the elastic force of the limit elastic member 57 and disengages from the deployment matching portion 531a of the connecting portion 531, Thereby, the pedal 53 is rotatable relative to the pedal arm 52 . That is, when the pedal arm 52 is rotated relative to the front wheel frame 12 to the pedal retracted position P522, the force application portion 123 of the front wheel frame 12 may contact the limit rod 56 to apply a pressing force to the limit rod 56, so that The position limiting rod 56 can release the cooperation with the deployment matching portion 531 a of the connecting portion 531 , so that the position limiting and locking effect on the pedal 53 relative to the pedal arm 52 can be released at the first pedal deployment position P531 . Therefore, the connecting portion 531, that is, the pedal 53 can rotate freely relative to the pedal arm 52. What is shown in FIG. state, as the pressure edge of the force applying part 123, the stop rod 56 is pressed away from the deployment matching part 531a of the connecting part 531, so that under the action of gravity, the pedal 53 relative to the pedal arm 52 starts from the first pedal deployment position P531 Rotate and expand to the flush position where the pedal 53 is substantially flush with the supporting surface G0 , this position can also be referred to as the second pedal deployment position P533 of the pedal 53 relative to the pedal arm 52 .

In the illustrated embodiment, the connecting portion 531 of the pedal 53 may also have a second matching portion 531c. Apply force to the limit rod 56, so that the limit elastic member 57 elastically supporting the limit rod 56 is elastically compressed or stretched, so that the position of the position limit is released between the limit rod 56 and the deployment matching portion 531a, thereby The pedal 53 is allowed to rotate relative to the pedal arm 52 to the flush position shown in FIG. 6 , that is, the aforementioned second pedal deployment position P533. In the second pedal deployment position P533 , the limiting rod 56 can abut against the second matching portion 531 c to jointly limit the continuous rotation of the pedal 53 relative to the pedal arm 52 . The fact that the pedal 53 is flush with the pedal arm 52 can be understood as the pedal 53 moves to the second pedal deployment position P533 where the two have the same extension direction, and the angle α53 between the pedal 53 and the pedal arm 52 can be close to 180°, for example, may be 175° to 185°. In the second pedal unfolded position P533, when the pedal assembly 50 or the folding wheelchair 800 where it is assembled needs to be folded, the pedal 53 can provide the avoidance space required for folding, preventing damage to other parts during the folding process. put one's oar in.

It can be understood that, as mentioned above, during the actual folding process, when the limited position between the limit rod 56 and the unfolded matching portion 531a is released, the pedal 53 can be moved to a substantially flush position by the action of gravity, Just push against the supporting surface G0. Therefore, the second matching portion 531c may not be provided in the connecting portion 531, and the pedal 53 is maintained at approximately the second pedal deployment position P533 by directly relying on the support surface G0.

In the embodiment shown in FIGS. 4A to 6 , the retractable fitting portion 531b and/or the second fitting portion 531c may be a convex portion protruding from the connecting portion 531, and the convex portion may be the self-connecting portion 531 shown in the figure. A protrusion protruding outward from the periphery. Wherein, the retractable matching portion 531b in the shape of a convex portion is connected to the limiting member 58 by snap-fitting, and the second matching portion 531c in the shape of a convex portion is in contact with the limiting rod 56 and is limited by the limiting rod 56. bit. The deployment fitting portion 531a can be a notch opened on the connecting portion 531, and the notch can be formed by indenting from the outer peripheral edge of the connecting portion 531 to the inner side of the connecting portion 531 as shown in the figure. (such as the shaft or the end) is snapped into the groove-shaped expansion fitting part 531a to realize the cooperation between the stop rod 56 and the connecting part 531, and by applying force to the stop rod 56, it can be disengaged from the notch, thereby releasing the limit state.

In the embodiment shown in Fig. 3 to Fig. 6, the limiting member 58 can have a hook portion 581, and the hook portion 581 can protrude from the limiting member body 582, and the limiting member body 582 can be opened for contact with the limiting member. The position bar 56 fits into the connecting hole 580 . There may be an included angle between the extension direction of the hook portion 581 and the extension direction of the stopper body 582, so that when the stopper body 582 is driven by the stopper rod 56 to rotate around the hinge axis H58, the hook portion 581 will also Turn accordingly. The hook portion 581 may be an elastic member, which can be deformed when subjected to an external force, so as to be snapped or released with the protrusion-shaped fitting portion 531b. For example, referring to FIG. 4A , when the connecting portion 531 of the pedal 53 is rotated in the clockwise direction shown in the illustration, the collapsible fitting portion 531b can abut against the upper end surface of the hook body of the hook portion 581 , so that the hook portion 581 is lowered as a whole. bending deformation, the collapsing matching portion 531b snaps into the hook portion 581, thereby completing the snapping. Referring to Fig. 5A, when the connecting part 531 rotates in the counterclockwise direction as shown in the figure, the retractable fitting part 531b can push against the lower end surface of the hook body of the hook part 581, so that the entire hook body is upturned and deformed, and the retractable fitting part 531b automatically The hook part 581 comes out, and the tripping is completed. For example, the hook portion 581 may be made of plastic with a certain degree of elasticity, and for another example, the entire limiting member 58 is configured as an elastic component.

4A and 5A, the hook portion 581 may have an upper end surface 581a, when the pedal 53 moves relative to the pedal arm 52 from the first pedal extended position P531 ( FIG. 4A ) to the pedal retracted position P532 ( FIG. 5A ). ), that is, when the retractable mating portion 531b moves from the unfastened state to the engaged state with the hook portion 581 , the upper end surface 581a is the surface that first contacts the retractable mating portion 531b. The upper end surface 581a can be configured as a slope. For example, the hook portion 581 can have a hook arm 581b and a hook body 581c. When in contact with the retractable fitting portion 531b, the inclined upper end surface 581a can be inclined to fit with the retractable fitting portion 531b, so that the hook portion 581 is deformed, so that the retractable fitting portion 531b is easier to engage with the hook body 581c combine.

Referring to FIGS. 4A and 5A , the pedal arms 52 may be a pair as shown disposed in the pedal assembly 50 . The pedal 53 may extend laterally (or, left and right), and the connecting portion 531 may be two spaced apart along the lateral direction. The two connecting parts 531 are hinged to the pair of pedal arms 52 respectively. In the figure, the two connecting parts 531 and the two pedal arms 52 are respectively hinged by hinges H51 , so that the pedal 53 can rotate relative to the two pedal arms 52 around the hinge H51 . The pedal 53 has a certain length along the lateral direction, and the two pedal arms 52 are hinged to it, which can play a more stable supporting role. In another embodiment, the number of pedal arms 52 may also be one or more than three. Further, the limiting member 58 may be a pair corresponding to the number of the connecting parts 531 . The two limiters 58 are hinged to the two pedal arms 52 through a hinge H58 respectively, so that the two limiters 58 can rotate around the hinge H58 relative to the two pedal arms 52 . It can be understood that there is a one-to-one correspondence between the stoppers 58 and the connecting parts 531 in the figure, so that the number of the stoppers 58 is matched with the number of the connecting parts 531. The portion 531 is provided on the same side of the pedal arm 52 .

In the illustrated embodiment, one end (in FIG. 1 , the lower end) of the first connecting arm 102 can be hinged to the front wheel frame 12 of the front wheel assembly 10, and the first connecting arm 102 can be arranged so that it can be positioned relative to the upper part of the front wheel frame 12. 126 rotates to the joint arm deployment position P101. As mentioned many times before, the upper part 126 of the front wheel frame 12 is only the upper part of the front wheel frame 12 when the folding wheelchair 800 is in the normal use state shown in FIG. 1 or FIG. 19A . 126 may become the front portion of the front wheel frame 12. The included angle α102 between the first connecting arm 102 and the front wheel frame 12 (the upper part 126) is shown in FIG. Since it is not easy to show at this time, it is not shown in the figure) may be, for example, 160-180°. In Fig. 20, when the first connecting arm 102 is rotated to the joint arm deployment position P101 relative to the upper part 126 of the front wheel frame 12, the front wheel frame 12 of the front wheel assembly 10 can be rotated and folded to the front wheel folding position P122 relative to the seat cushion assembly 80 . At the front wheel folding position P122, the left and right front rollers 11 supported by the front wheel frame 12 can be respectively accommodated to the left and right sides of the cushion assembly 80, and the outer diameter of the front rollers 11 can be set to match the cushion assembly 80 The thickness dimension in the thickness direction T80 is equivalent and thus does not protrude.

5B, when the pedal arm 52 is rotated relative to the front wheel frame 12 to the pedal retracted position P522, the front wheel frame 12 can have a pair of pedal arms accommodated in the aforementioned settings in the lateral direction (or, left and right direction). The middle portion 124 between 52 may also have side portions 125 disposed on both sides. The aforementioned force application portion 123 may be disposed on the middle portion 124 to facilitate force application to the shaft of the limiting rod 56 . The side portion 125 may have a receiving notch 125 for conveniently engaging the pedal arm 52 . The included angle α52 between the pedal arm 52 and the front wheel frame 12 is shown in FIG. It is not easy to show, so it is not shown) For example, it can be -5-5°. In addition, in the normal use state shown in FIG. 1 or FIG. 19A , the included angle α52 between the pedal arm 52 and the front wheel frame 12 can be, for example, 155°-175°. The included angle α53 between the pedal 53 and the pedal arm 52 is particularly suitable for the user to place the foot on the pedal 53 .

The pedal arm 52 and the first connecting arm 102 may be respectively provided with a buckling portion 520 and a buckling portion 102a. When the first connecting arm 102 is at the connecting arm unfolded position P101 and the pedal arm 52 is at the pedal retracted position P522, the fastening portion 102a of the first connecting arm 102 can be fastened with the fastening portion 520 of the pedal arm 52, as Figure 5A, Figure 5B or Figure 20.

When the pedal arm 52 and the front wheel frame 12 shown in FIG. 19T have been in the pedal retracted position P522 move together with the first connecting arm 102 to the first position shown in FIG. 20 (as shown in FIG. 5A or FIG. 5B ). When the connecting arm 102 is in the state of the connecting arm unfolded position P101 relative to the front wheel frame 12, the fastening portion 102a and the fastening portion 520 will be fastened to each other as shown in FIG. 12 turns. No matter in which direction the folding wheelchair 800 in the fully folded state shown in FIG. 20 is transported, looseness is not likely to occur. During this period, the buckling portion 102 a and the buckling portion 520 avoid each other.

In the illustrated embodiment, the fastening portion 102a and the fastening portion 520 may respectively be hook structures shown in the figure, and the hook portions of the two hook structures may cooperate with each other to fasten and limit.

In the illustrated embodiment, the fastening portion 102 a is centered at the hinge joint between the first connecting arm 102 and the front wheel frame 12 , and rotates coaxially and synchronously with the first connecting arm 102 relative to the front wheel frame 12 . Referring to FIG. 3 , the first connecting arm 102 and the front wheel frame 12 can be hinged to each other through the hinge axis H102 , so that the first connecting arm 102 and the front wheel frame 12 can rotate relative to each other around the hinge axis H102 . A sleeve 102b is disposed in the front wheel assembly 10 , the fastening portion 102a is formed on the sleeve 102b , and the sleeve 102b is disposed on the hinge axis H102 and configured to rotate synchronously with the first connecting arm 102 . For example, the sleeve 102b may be limited by a limiting member such as a pin so as to rotate synchronously with the first connecting arm 102 , and for another example, the sleeve 102b may be configured as an integral part with the first connecting arm 102 . By configuring the fastening part 102a to rotate coaxially and synchronously with the first connecting arm 102, when the first connecting arm 102 moves, it can drive the fastening part 102a to act synchronously, so as to realize fastening during movement. The avoidance between the part 102a and the buckling part 520.

The above-mentioned front wheel assembly 10 can be rotated and folded relative to the seat cushion assembly 80, thus, the angle between the seat cushion assembly 80 and the supporting surface G0 can be changed, and this feature can also become a kind of feature that can make it easier for the user to sit in the folding wheelchair 800. The way. For example, the front wheel assembly 10 can be rotated and folded relative to the seat cushion assembly 80 through the aforementioned controller to the state where the pedal 53 in FIG. ) step onto the folding wheelchair 800, which is convenient for the user to enter. After the user takes a seat, the front wheel assembly 53 is controlled by the aforementioned controller to get back to the normal walking position. Similarly, if the user needs to leave the folding wheelchair 800, the front wheel assembly 10 can be rotated and folded to the state in FIG. It is very convenient for the user to get off the wheelchair under the premise. Of course, it can be understood that in FIG. 19L , the armrest components described in detail later are all in the folded state, and when it is actually convenient for the user to enter the folding wheelchair 800, the armrest components can all be in the open state.

1.3. Rear wheel assembly 20

Returning to Fig. 1, with reference to Fig. 19A, the upper ends of the front wheel assembly 10 and the rear wheel assembly 20 can be rotatably connected to the front connection position P1 and the rear connection position P2 of the cushion assembly 80 respectively, thus, the front wheel assembly 10 and the rear wheel assembly There may be a front rotation axis O1 and a rear rotation axis O2 between the upper end of the assembly 20 and the cushion assembly 80 .

In the illustrated embodiment, the front rotation axis O1 and the rear rotation axis O2 may be out-of-plane straight lines, whereby the rear wheel assembly 20 (as an example of the aforementioned second party) avoids the front wheel assembly 10 when folded relative to the seat cushion assembly 80 (as an example of the aforementioned first party). In other words, the front rotation axis O1 and the rear rotation axis O2 are not parallel. In FIG. 19A , the front rotation axis O1 is perpendicular to the paper, while the rear rotation axis O2 is not perpendicular to the paper. For example, the rear wheel assembly 20 may face sideways when folded relative to the seat cushion assembly 80 (i.e., the left side rear wheel frame 22 faces to the left, and the right rear wheel frame 22 faces to the right) or toward the side. (That is, the left side rear wheel frame 22 is facing the right side, and the right side rear wheel frame 22 is facing the left side) is retracted after turning over to a certain extent, and the front wheel assembly 10 can be avoided during the turning process. This rear wheel assembly 20 can also be called a rotatable rear wheel assembly.

In the illustrated embodiment, the front rotation axis O1 may extend laterally (or, left and right) of the cushion assembly 80 , and the rear rotation axis O2 may extend obliquely upward toward the side. That is, the left rear rotation axis O2 extends obliquely upward toward the left, and the right rear rotation axis O2 extends obliquely upward toward the right.

In the illustrated embodiment, the rear wheel assembly 20 can be arranged such that the rear wheel assembly 20 is in the rear wheel unfolded position P201 (as shown in FIG. 1 and FIG. 19A to FIG. Figure 1, Figure 19T to Figure 20). Referring to FIG. 19O , at the rear wheel deployment position P201 , the rolling axis O21 of the rear roller 21 of the rear wheel assembly 20 can extend laterally along the cushion assembly 80 , that is, perpendicular to the paper in FIG. 19O . Referring to FIG. 19T , at the rear wheel folding position P202 , the rolling axis O21 of the rear roller 21 can extend along the thickness direction of the cushion assembly 80 , that is, extend forward and backward in FIG. 19T . For example, in the rear wheel deployment position P201, the angle between the rear wheel frame 22 of the rear wheel assembly 20 and the cushion assembly 80 can be 90-110 °, and in the rear wheel expansion position P201, the rear wheel frame 22 of the rear wheel assembly 20 The included angle with the cushion assembly 40 can be 0-10°. In other words, as the rear wheel assembly 20 rotates and folds from the rear wheel unfolded position P201 (eg, FIG. 19P ) to the rear wheel folded position P202 (eg, FIG. 19T ) relative to the seat cushion assembly 80 , the rolling axis O21 of the rear roller 21 changes from the position along the seat cushion. The lateral extension of the assembly 80 becomes extending along the thickness direction of the cushion assembly 80 , and is finally accommodated in the storage box 821 provided below the cushion assembly 80 . In the figure, the two ends of the second connecting arm 202 can be respectively hinged to the second movable member 201 and the rear wheel assembly 20 through a universal joint such as a fisheye joint E1.

In the illustrated embodiment, the rear wheel assembly 20 will also trigger the backrest assembly 30 during the rotation and folding process from the rear wheel unfolded position P201 (eg, FIG. 19P ) to the rear wheel folded position P202 (eg, FIG. 19T ) relative to the seat cushion assembly 80 The folding process will be described in detail later.

In general, an exemplary folding operation of the leg assembly of the folding wheelchair 800 may be described with reference to FIGS. 19K-20 . Among them, in FIG. 19K, the front wheel assembly 10 and its pedal assembly 50 of the folding wheelchair 800 are in an unfolded state. In FIG. 20, the front wheel assembly 10 and its pedal assembly 50 of the folding wheelchair 800 are in a folded state. The folding wheelchair 800 moves from an unfolded state to a plurality of intermediate states of a folded state.

As shown in FIG. 19K , the pedal assembly 50 corresponding to this position is roughly in the state shown in FIG. 4A , and at the same time, the front wheel assembly 10 is roughly in the use state as shown in FIG. 3 . When the first movable part 101 moves toward the rear side in the direction shown in FIG. Rotate so that the front end portion of the pedal 53 is in contact with the support surface G0, and moves to the state shown in FIG. 19L.

When the first movable part 101 continues to move toward the rear side in the direction shown in FIG. 19L , the first connecting arm 102 continues to be driven by the first movable part 101 to continue to drive the front wheel frame 12 to rotate counterclockwise as shown At this time, the pedal 53 is flat on the support surface G0 as a whole under the pressure of the pedal arm 52. In this state, the limit elastic member 57 supporting the limit rod 56 is elastically compressed or stretched to allow The limiting rod 56 is slightly disengaged from the groove-shaped deployment fitting portion 531a, and is not completely disengaged from the deployment fitting portion 531a, and moves to the state shown in FIG. 19M . Specifically, with reference to the movement direction between the pedal 53 and the pedal arm 52 from the first pedal deployment position P531 to the retracted position, the groove-shaped deployment matching portion 531a shown in FIG. 5A is formed by The two protrusion structures define that the protrusion 531f of the groove-like structure is formed at the upstream position of the movement direction, and the protrusion 531g of the groove-like structure is formed at the downstream position relative to the movement direction, and the protrusion 531f is more protruding from the connecting portion 531, so that the limit rod 56 can be slightly disengaged from the groove-shaped deployment fitting part 531a under the action of an external force, and quickly return to the deployment fitting part 531a after the external force is removed, while having a higher protrusion The high protrusion 531f can further prevent the limit rod 56 from being released from the side of the protrusion 531f. In another embodiment, the deployment matching portion 531a is formed by two protruding point structures which may also have the same protruding height.

When the first movable part 101 continues to move toward the rear side in the direction shown in FIG. 19M , the first connecting arm 102 continues to be driven by the first movable part 101 to continue to drive the front wheel frame 12 to rotate counterclockwise as shown At the same time, the front roller 11 rolls toward the rear side in the figure, and the angle between the pedal arm 52 and the front wheel frame 12 gradually increases. After moving to the state shown in FIG. 19N, it continues to move to the state shown in FIG. 19O. During the movement of the folding wheelchair 800 from FIG. 19M to the state of FIG. 19O, the rolling wheels 54 are always in contact with the supporting surface G0, so that rolling friction is generated between the parts of the folding wheelchair 800 and the supporting surface G0, preventing the parts of the folding wheelchair 800 from contacting the supporting surface. Interference between faces G0 causes wear.

After the folding wheelchair 800 moves to the state shown in FIG. 19O, the rolling wheel 54 is in contact with the support surface G0 and rolls, so that the angle between the pedal arm 52 and the support surface G0 gradually decreases, and the foot pedal 53 is no longer in contact with the support surface. When the surface G0 is in contact, the limit rod 56 is reset to cooperate with the deployment matching portion 531a.

The first movable part 101 continues to move toward the rear side in the direction of FIG. 19O, pulling the front wheel frame 12, so that the angle between the front wheel frame 12 and the supporting surface G0 gradually further decreases, and at the same time, the pedal arm hinged to it 52 is under pressure, and the angle between the pedal arm 52 and the support surface G0 is gradually further reduced, while the angle between the pedal arm 52 and the front wheel frame 12 is gradually increased until it moves to the state shown in Figure 19P, and the front wheel The frame 12 and the pedal arm 52 are placed almost horizontally on the support surface G0.

The first movable member 101 continues to move upward toward the rear side in the direction shown in FIG. The force-applying part 123 presses down the limit rod 56, so that the limit rod 56 is no longer in contact with the deployment matching part 531a, and the pedal 53 falls to be flush with the support surface G0 under the action of gravity until it moves to the position shown in Figure 19Q In the state shown, at this time, the limiting rod 56 can abut against the third matching portion 531c. The relative positional relationship between the pedal arm 52 and the pedal 53 in this state is substantially flush as shown in FIG. 6 . The pedal retracted position P522 is located between the pedal arm 52 and the front wheel frame 12 .

The first movable part 101 changes the moving direction in the direction shown in Fig. 19Q, and moves toward the front side downward, thereby pulling the seat cushion assembly 80 to rotate in the counterclockwise direction as shown in the figure, and continues to pull until the folding wheelchair 800 is gradually turned over from Fig. 19R to the state shown in Fig. 19S. At the same time, the rear wheel assembly 20 is rotated and folded relative to the cushion assembly 80 under the pull of the second connecting arm 202 until the state shown in FIG. 19T, that is, in FIG. Rear wheel folding position P202.

The first movable part 101 changes the moving direction in the direction of FIG. 19T, and moves towards the top of the figure, thereby pulling the front wheel frame 12 to rotate in the counterclockwise direction of the figure. Press the end 804 of the pedal arm 52 and the front wheel frame 12 to be in the pedal retracted position P522. Therefore, when the front wheel frame 12 rotates in the counterclockwise direction as shown in the figure, it can drive the pedal arm 52 to follow, with the same The kinematic relationship of the seat is rotated relative to the cushion assembly 80, and moves to the state shown in FIG. 20 through the states shown in FIG. 19U and FIG. 19V in sequence.

In the state shown in FIG. 20 , the buckling portion 102a and the buckling portion 520 cooperate with each other to limit the position, thereby preventing the pedal arm 52 from detaching from the front wheel frame 12. At the same time, the folding of the connecting portion 531 of the pedal 53 The matching portion 531b also cooperates with the limiting member 58 of the limiting device 55 to limit the position, as shown in FIG. 5A , so far the entire front wheel assembly 10 is completely engaged with the seat cushion assembly 80 to facilitate transportation. Moreover, at this time, the entire folding wheelchair 800 is folded, and at this time, the rolling wheels 54 can serve as rolling wheels for transporting the folding wheelchair 800 in the folded state.

2. Supporting components

In the illustrated embodiment, the folding wheelchair 800 may include a rest assembly. The armrest assembly can be described with reference to FIGS. 7A to 18 . The backrest assembly may include a backrest assembly 30 and/or a handrest assembly 40 . It can be understood that the backrest assembly 30 can be used for the user to sit on the seat cushion assembly 80 of the folding wheelchair 800, and the hand-held assembly 40 can include an armrest 4 for the user to sit on the seat cushion assembly 80 of the folding wheelchair 800. help.

In the illustrated embodiment, the backrest assembly 30 can be rotatably and foldably installed on the cushion assembly 80 through the hinge H30, for example. In the illustrated embodiment, the backrest assembly may further include a backrest locking assembly 60 , which may be used to keep the backrest assembly 30 in the backrest deployment position P301 relative to the seat cushion assembly 80 . In the illustrated embodiment, the armrest assembly may further include an unlocking assembly 70 , which may be used to release the state locking of the backrest assembly 30 relative to the seat cushion assembly 80 by the backrest locking assembly 60 .

2.1. Backrest component 30

An example structure of the backrest assembly 30 can be seen in FIGS. 7A to 8B .

Referring to FIG. 7A and FIG. 7B , the backrest assembly 30 may include a backrest frame 31 , and the backrest frame 31 may have a mounting section 311 extending vertically (that is, up and down in a normal use state) on the side. The installation section 311 defined as extending vertically may substantially extend strictly along the direction D1 in FIG. 7A or FIG. 9A , as long as the direction D1 has a vertical component. Preferably, the angle between the direction D1 and the vertical is less than 45°, further preferably, the direction D1 is inclined backward by 10-30° relative to the vertical, and further preferably, inclined backward by 13°, so as to improve the user's back Rely on comfort. In other words, the backrest assembly 30 may have a vertically extending installation segment 311 on the side. In the illustrated embodiment, the backrest assembly 30 (the backrest frame 31) can have installation sections 311 on both sides (left and right), and the two installation sections 311 can be made of two pipes such as steel pipes, In another embodiment, the two installation sections 311 may also be composed of two parts on two sides of a back panel.

In the illustrated embodiment, the back frame 31 may include two vertical tubes 313 and a horizontal tube 314, the horizontal tube 314 connects the two vertical tubes 313 on the upper side of the two vertical tubes 313, and the two vertical tubes 313 can support On a folding wheelchair 800 such as a cushion assembly 80 . The two vertical tubes 313 and the horizontal tubes 314 can be formed by bending a single tube, or can be welded after processing respectively. The two vertical pipes 313 can respectively provide the aforementioned two installation sections 311 .

The backrest assembly 30 may further include a backrest 32, and the backrest 32 may provide a backrest surface 321 for the user to lean on. The back cushion 32 can be made of soft material, for example, to improve the comfort of the user's backrest.

The backrest assembly 30 may also include upper and

lower push rods

331 , 332 . The back cushion 32, the two

push rods

331, 332 and the back rest frame 31 can constitute the hinge four-bar mechanism A3. Wherein, the back cushion 32 and the backrest frame 31 respectively constitute the connecting rod and the frame of the four-bar hinge mechanism A3, and the two

push rods

331, 332 constitute the two connecting rods of the four-bar hinge mechanism A3.

Those skilled in the art know that the hinged four-bar mechanism is a four-bar mechanism in which all kinematic pairs are revolving pairs, one of the components is called a frame as a supporting base, and the component directly hinged with the frame is called a link rod. The components directly connected to the frame are called connecting rods, and among them, the connecting rods that can make a full circle rotation can also be called cranks, and the connecting rods that can only swing back and forth within a certain angle range can also be called cranks. rocker. In the hinged four-bar mechanism A3, the back cushion 52 and the backrest frame 31 respectively constitute the connecting rod and the frame of the hinged four-bar mechanism A3, and the push rod 331 and the push rod 332 respectively constitute the upper and lower connecting frames of the hinged four-bar mechanism A3. pole. That is, the two ends of the back cushion 52 can be respectively hinged with the first end (in FIG. 7B, the upper end) of the push rod 331 and the first end (in FIG. 7B, the upper end) of the push rod 332. end can be respectively hinged with the second end (in Fig. 7B, the lower end) of the push rod 331 and the second end (in Fig. The hinged position of the backrest frame 31 and the push rod 331 is located at the upper side. It can be understood that the back cushion 52, the push rod 331, the push rod 332 and the back frame 31 form the hinged four-bar mechanism A3, which means that it forms the hinged four-bar mechanism A3 in at least one state, and it does not rule out that there may be a hinged four-bar mechanism A3 in another state. Other composition relations, in other words, the four members (that is, the back cushion 52, the push rod 331, the push rod 332 and the back frame 31) that make up the hinged four-bar mechanism A3 may not always be hinged to each other, but at least have mutual hinges so that Form the state of the hinged four-bar mechanism A3.

The back cushion 32 is arranged to be switchable relative to the backrest frame 31 from the cushion push-out position P321 (shown in FIG. 19G , see also FIGS. 7A and 7B ) to the The cushion stowed position P322 (shown in Figure 19K, see also Figures 8A and 8B). The cushion 32 is closer to the front side at the cushion pushing position P321 than at the cushion folding position P322. In other words, the cushion 32 moves from the cushion push-out position P321 to the cushion stowed position P322, substantially from rear to front. In addition, the cushion intermediate position P320 shown in FIGS. 19H to 19J includes a plurality of positions where the cushion 32 may be closer to the front side or the rear side than at the cushion push-out position P321 . In the illustrated embodiment, the back cushion 32 moves from the back cushion pushing position P321 to the back cushion folding position P322, and can also move from bottom to top at the same time. In a preferred embodiment, at the push-out position P321 of the back cushion, the side projection of the back cushion 32 can coincide with the backrest frame 31 .

The backrest assembly 30 may further include a backrest elastic member S33. One end of the backrest elastic member S33 can be connected to one push rod 331 of the two

push rods

331 , 332 , and the other end is connected to the back cushion 32 . The elastic force of the backrest elastic member S33 makes the back cushion 32 have a tendency to switch from the middle position of the back cushion P320 to the push-out position P321 of the back cushion or the folded position of the back cushion P322. That is to say, by setting the backrest elastic member S33, it is difficult to maintain the back cushion 32 at the middle position P320 of the back cushion, but it will always be stably maintained at the cushion push-out position P321 or the back cushion folded position P322. In the position P321 where the backrest is pushed out, it is convenient for the user to lean on the back, and in the position P322 where the backrest is folded, it is convenient for the user to store, that is, the backrest elastic member S33 provides the retaining force for the backrest 32 after it is unfolded or folded. The above structure makes the structure simple and reliable under the condition of realizing diversified functions. For example, the backrest elastic member S33 can be a tension spring, so that the stretching amount of the stretching spring is the smallest when the cushion is pushed out at the position P321 or the backrest folded position P322, and the stretching amount is the largest at the middle position of the cushion P320. In the illustrated embodiment, the back cushion 32 is provided with a spring post 324 , the push rod 331 is provided with a spring post 334 , and the backing elastic member S33 is a tension spring connected and fixed between the spring post 324 and the spring post 334 .

In the illustrated embodiment, two upper and lower push rods are respectively provided on both sides of the back cushion 32. For example, the upper and lower push rods on the right side are marked with 331 and 332, while the upper and lower push rods on the left side are marked with 331 and 332 respectively. The rods are indicated at 331a, 332a (as shown in Figure 7A). The back cushion 32, the two push rods (such as 331, 332, or 331a, 332a) on each side and the mounting section 311 on the side where the two push rods are located all constitute a hinge four-bar mechanism. In other words, one side of the cushion 32 is connected to the installation section 311 on the one side through the

push rods

331, 332, and the other side is connected to the installation section 311 on the other side through the

push rods

331a, 332a. This structure is more reliable.

The above-mentioned backrest assembly 30, especially its back cushion 32, can be pushed out, opened or folded, and even the side projection of the folded back cushion 32 can overlap with the backrest frame 31, which can provide good back especially lumbar support when opened.

2.2. Hand-held component 40

Referring to FIGS. 7A to 11C , example configurations of the handrail assembly 40 , which may include the armrest 4 , are shown.

Referring to FIG. 9A , the hand-holding assembly 40 may include a hand-held folding assembly 43 , and the hand-holding folding assembly 43 may include the aforementioned armrest 4 . The hand folding assembly 43 may also include a first rod 41 and a second rod 42 .

The armrest 4 can have a rod section 401 . The rod segment 401 of the armrest 4 , the first rod 41 , the second rod 42 and the installation segment 311 of the backrest assembly 30 can form a hinge four-bar mechanism A1. In the hinged four-bar mechanism A1, the rod section 401 of the armrest 4 and the installation section 311 of the backrest assembly 30 respectively constitute the connecting rod and the frame of the hinged four-bar mechanism A1, and the first rod 41 and the second rod 42 constitute the hinged four-bar respectively. Linkage rods on the upper and lower sides of mechanism A1. That is, the two ends of the rod section 401 can be respectively hinged with the first end (in FIG. 9A , the upper end) of the first rod 41 and the first end (in FIG. 9A , the upper end) of the second rod 42, and the two ends of the mounting section 311 The ends can be hinged with the second end (in FIG. 9A , the lower end) of the first rod 41 and the second end (in FIG. 9A , the lower end) of the second rod 42 respectively, wherein, compared with the mounting section 311 and the second rod 42 The hinged position of the mounting section 311 and the first rod 41 is located on the upper side. The rod segment 401 of the armrest 4 is the part of the armrest 4 that provides the hinged position B41 hinged with the first rod 41 and the hinged position B42 hinged with the second rod 42 . In the illustrated embodiment, the second rod 42 is hinged to the backrest assembly 30 (specifically, the mounting section 311) through the locking support 6 which will be described in detail later, instead of being directly hinged to the backrest assembly 30, the second rod 42 is connected to the locking The hinge axis of the support 6 can be arranged coaxially with the hinge axis H30 of the backrest assembly 30 and the locking support 6 .

In the above-mentioned hand-held assembly 40, the armrest 4 of the hand-held folding assembly 43 provides a rod section 401 as a connecting rod of the hinged four-bar mechanism, and the backrest assembly 30 provides an installation section 311 as a frame of the hinged four-bar mechanism, and the armrest 4 can be Move flexibly relative to the backrest assembly 30, so that the size of the structure formed by the armrest 4 and the backrest assembly 20 can be changed at least in the front-rear direction, whereby the hand-held assembly 40 can be in a state where the front-rear size of the overall structure is large and the front-to-back direction Easily switch between states of smaller size. In the state where the front and rear dimensions of the overall structure are large, the user can hold the armrest 4 by hand, which can also be called the use state of the hand-held assembly 40 at this time. In the state where the front and rear dimensions of the overall structure are small, it is convenient for the user to arrange the hand arm assembly 40 and the backrest assembly 30 , which can also be referred to as the storage state of the hand arm assembly 40 . When using the above-mentioned hand-held assembly 40 , when switching from the use state to the storage state, the user can operate a small range of motion during the process of turning over the armrest 4 , and the user can comfortably turn over the armrest 4 while sitting on the folding wheelchair 800 .

In the illustrated embodiment, the hinge four-bar mechanism A1 is configured to switch from the four-bar unfolded state (as shown in FIG. 19D ) to the four-bar folded state (as shown in FIG. 19H ). The switching process can be referred to FIG. 19D to FIG. 19H. The hinge four-bar mechanism A1 switches from the four-bar unfolded state of FIG. 19D to the four-bar folded state of FIG. 19H through the intermediate states of FIG. 19E, FIG. 19F, and FIG. In the unfolded state shown in FIG. 19D , the angle between the first rod 41 and the rod segment 401 is α41 and the jaw faces downward. α41 can be 150-180°, and more preferably, α41 can be 170-180°. . In the four-bar folded state shown in FIG. 19H , the angle between the first bar 41 and the bar section 401 is α42 (not shown in the figure because it is not easy to show), and the jaws are upward, and α42 is 0-30°. Even more preferably, α42 is 0-10°. In the four-bar intermediate state of FIG. 19E , FIG. 19F and FIG. 19G , the included angle between the first bar 41 and the bar segment 401 is shown by α40. In the four-bar unfolded state of FIG. 19D , the user can use the hand-held assembly 40 , that is, the hand-held armrest 4 , and in the four-bar folded state of FIG. 19H , the user can store the hand-held assembly 40 . In the illustrated preferred embodiment, α41 is 173.6°, and α42 is 5.4°. In this way, the unfolding can be made more fully and the folding can be more compact. The hinged four-bar mechanism A1 can be configured as a crank-rocker mechanism, wherein the first rod 41 constitutes the crank of the crank-rocker mechanism, and the second rod 42 constitutes the rocker of the crank-rocker mechanism. For example, the first rod 41 as a crank may be the shortest rod among the four members constituting the hinge four-bar mechanism A1. It can be understood that the rod length is based on the distance between the hinge positions (hinge center) at both ends of each component, not necessarily the length of the component itself.

In the illustrated embodiment, the four-bar unfolded state shown in FIG. 19D also corresponds to the armrest unfolded state of the armrest 4, and the angle α43 between the armrest 4 and the backrest assembly 30 (specifically, the installation section 311) can be 90- 120°, preferably 101.4°. In the four-bar folded state shown in FIG. 19H , which also corresponds to the folded state of the armrest 4, the angle α43 between the armrest 4 and the backrest assembly 30 (specifically, the installation section 311) can be -10-20°, preferably , 0°. From FIG. 19D to FIG. 19H , the included angle α43 first increases and then decreases. It can be understood that, taking -10° as an example, the angle between the armrest 4 and the backrest assembly 30 being -10° means that the armrest 4 is inclined backward by 10° relative to the backrest assembly 30 .

In the illustrated embodiment, the armrest assembly 40 may further include an armrest locking assembly 44 . The armrest locking assembly 44 can lock the state of the hinge four-bar mechanism A1. For example, the hinge four-bar mechanism A1 can be locked in the four-bar unfolded state in FIG. 19D , or in the folded state in FIG. 19H , or locked in any four-bar intermediate state through the armrest locking component 44 . For example, the armrest locking assembly 44 can be a detachable fastener, which can fix the first rod 41 constituting the hinge four-bar mechanism A1, be fixed to other components of the hinge four-bar mechanism A1, or be fixed to the backrest assembly 30, Alternatively, other parts of the wheelchair 800 such as the cushion assembly 80 may be folded so that the first rod 41 cannot rotate relative to the hinged position at either end. Fasteners can be, for example, screws, bolts, or locking pins, tapes, ropes, shackles, and the like.

As before, the hinged four-bar mechanism A1 has a four-bar unfolded state for hand-holding, as shown in FIG. 19D . An armrest lock assembly 44 may be used to lock the four-bar deployed state. This can make the entire structure more reliable when the user uses it, and will not lose stability.

The armrest locking assembly 44 can lock the state of the hinge four-bar mechanism A1 by locking the rod section 401 , the first rod 41 , the second rod 42 of the armrest 4 and the installation section 311 of the backrest assembly 30 . That is to say, two members can be arbitrarily selected among the four members of the rod section 401, the first rod 41, the second rod 42 and the installation section 311, and the armrest locking assembly 44 can lock the selected two members, so that These two components cannot move relative to each other, so that the state of the hinge four-bar mechanism A1 is locked and maintained.

Referring to FIGS. 10A to 11C , the armrest locking assembly 44 may include a handle 441 , a locking block 442 and a third rod 443 . The armrest 4 can have a branch 402 . As shown in FIG. 11A , the handle 441 , the lock block 442 , the third rod 443 and the branch section 402 (in FIG. 11A , simplified as dotted lines for better clarity) form a hinge four-bar mechanism A2. Wherein, the branch section 402 and the third rod 443 constitute the frame and the connecting rod of the four-bar hinge mechanism A2 respectively, and the handle 441 and the lock block 442 constitute two connecting rods of the four-bar hinge mechanism A2. That is, the two ends of the branch section 402 can be hinged with the first position 4411 of the handle 441 and the first position 4421 of the lock block 442 respectively, and the two ends of the third rod 443 can be respectively connected with the second position 4412 of the handle 441 and the lock block. The second position 4422 of 442 is hinged. The branch section 402 of the armrest 4 is the part of the armrest 4 that provides the hinged position B441 hinged with the handle 441 and the hinged position B442 hinged with the lock block 442 . It can be understood that the rod segment 401 and the branch segment 402 of the armrest 4 are not required to be two separate parts, but may be the same part, or two parts that partially overlap. Similar to the aforementioned hinged four-bar mechanism A1, the four members (that is, the handle 441, the lock block 442, the third rod 443 and the branch 402) constituting the hinged four-bar mechanism A2 may not always be hinged to each other, but at least have They are hinged to each other to form the state of the hinged four-bar mechanism A2, which is the case in the illustrated embodiment, which will be described in detail later.

In the hinge four-bar mechanism A2, the handle 441 is set to be rotatable relative to the branch 402 of the armrest 4, so that the lock block 442 rotates between the locking position P441 and the unlocking position P442 relative to the branch 402 of the armrest 4, as shown in Figure 11A to Figure 11B shows. In the locking position P441 in FIG. 11A , the locking block 442 is fastened to the first rod 41 constituting the hinge four-bar mechanism A1 , thereby locking the first rod 41 and the armrest 4 , as shown in FIG. 10A . At the unlocking position P442 , the locking block 442 disengages from the first rod 41 , thereby unlocking the locking connection between the first rod 41 and the armrest 4 . That is, pull the handle 441 so that the handle 441 rotates relative to the armrest 4 at the hinged position B441, and under the drive of the third rod 443 hinged with the handle 441, the lock block 442 hinged with the third rod 443 can be at the hinged position. B442 rotates relative to the armrest 4, so that it can be freely switched between the locked position P441 that is engaged with the first rod 41 and the unlocked position P442 that is disengaged from the first rod 41, and then can be in the locked state where the first rod 41 and the armrest 4 are locked. And switch between the unlocked states where the first lever 41 and the armrest 4 are disengaged. In the locked state, the first rod 41 is locked with the armrest 4, so that the state of the hinge four-bar mechanism A1 can be locked.

In the illustrated embodiment, the locking block 442 may have a locking hook 4420 . The first rod 41 may be fixedly connected with a hinge shaft H41 and hinged to the installation section 311 of the backrest assembly 30 through the hinge shaft H41 . Referring to FIG. 10A , in the locking position P441 , the locking hook 4420 of the locking block 442 is hooked to the hinge shaft H41 to which the first rod 41 is fixed, whereby the locking block 442 is fastened to the first rod 41 . This armrest locking assembly 44 has a compact structure and is easy to operate. The locking block 442 may have a locking hook 4420 on one side (in FIG. 11A , the front side), as before, for hooking the hinge shaft H41 to which the first rod 41 is fixed. The locking block 442 has a protruding finger portion 4423 on the other side (rear side in FIG. 11A ), which is convenient for the user to pull the locking block 442 upwards from the rear side of the armrest locking assembly 44 to disengage the locking block 442 from the locking position P441. The lock block 442 may have perforations at the first position 4421 and the second position 4422 , through which the hinge shafts pass through, so as to be hinged with the branch section 402 and the third rod 443 of the armrest 4 , thereby forming the armrest locking assembly 44 . Referring to FIG. 10C, the lock block 442 can also be provided with a magnet 4424. When the armrest assembly 40 is in the folded state of the armrest in FIG. The binding force of the folded state, in other words, can realize the locking of the folded state of the armrest.

Referring to FIG. 11A , the hinged four-bar mechanism A2 may be an anti-parallelogram mechanism. Those skilled in the art know that the antiparallelogram mechanism, that is, the line connecting the two hinge points of the frame and the connecting rod connecting the two hinge points intersects. In the hinge four-bar mechanism A2, the hinged position between the locking block 442 and the third rod 443 (that is, the second position 4422 of the locking block 442) as the link rod is located at the hinged position between the locking block 442 and the branch section 402 (that is, , the upper side of the first position 4421 of the lock block 442 or the hinged position B442 of the branch 402), the hinged position between the handle 441 and the branch 402 (that is, the first position 4411 of the handle 441 or the hinged position B441 of the branch 402 ) is located on the upper side of the hinge position between the handle 441 and the third rod 443 (that is, the second position 4412 of the handle 441). In this way, fingers gently pull the front end of the handle 441 upwards, that is, the handle rotates clockwise (in FIG. 11B , marked as R1) along the clockwise direction of FIG. direction (marked as R2 in FIG. 11B ), the lock hook 4420 located below the hinged position B442 can change from the locked position P441 in FIG. 11A to the unlocked position P442 in FIG. 11B .

In the embodiment shown in FIG. 11A and FIG. 11B , an elastic member S441 is provided between the handle 441 and the armrest 4 , and the elastic force of the elastic member S441 makes the handle 441 have a tendency to keep the locking block 442 at the locking position P441 . For example, in Fig. 11A, a compression spring is arranged between the front end of the handle 441 and the part above the handle 441 of the armrest 4. As the elastic member S441, the elastic force of the compression spring makes the front end of the handle 441 have a tendency to move downward, that is, , the handle 441 has a tendency to rotate counterclockwise around the hinge position B441 in FIG. That is, the handle 441 has a tendency to keep the lock block 442 in the locked position P441. That is, the elastic member S441 provides a pre-tightening force for maintaining the locked position of the handle 441 . In another embodiment, the elastic member S441 may also be a tension spring disposed between the front end of the handle 441 and the part of the armrest 4 below the handle 441 .

In the illustrated embodiment, in the hinge four-bar mechanism A2, the hinge axis H443 used to hinge the third rod 443 and the handle 441 is located in the slideway 414 . The slideway 414 allows one end (in FIG. 11A , the front end) of the third rod 443 to slide relative to the handle 441 . In the illustrated embodiment, the hinge shaft H443 can be fixedly connected to the third rod 443, and the slideway 414 is formed by the slideway of the handle 441, and the slideway is in the form of a waist-shaped hole extending forward and backward. It can be understood that, in another embodiment, the hinge shaft H443 may also be fixedly connected to the handle 441 , and the slideway 414 may be provided by the third rod 443 . Generally speaking, from the locking position P441 in FIG. 11A , when the locking block 442 is rotated counterclockwise around the hinged position B442 (as shown in the direction R2 in FIG. 11C ), the thrust of the locking block 442 on the third rod 443 is not enough to overcome the force of the elastic member S441. elastic force, so the handle 441 will not rotate around the hinge position B441 relative to the branch section 402 of the armrest 4, that is, at this moment, the handle 441 and the armrest 4 can be regarded as an integral control bracket fixed to each other, and the third rod 443 The front end of the front end will slide along the slideway 414 from the state of FIG. 11A forward (as shown in the direction T1 in FIG. 11C ), thereby reaching another unlocked state of FIG. 11C . In this process, the lock block 442, the third rod 443 and the aforementioned integral control bracket (composed of the armrest 4 and the handle 441) form a structure similar to a crank slider mechanism or a rocker slider mechanism, wherein the aforementioned integral control bracket, lock The block, the third bar and the hinge shaft respectively constitute the rack of the slider-crank mechanism (or rocker-slider mechanism), the crank (or rocker), the connecting rod and the slide block sliding along the slideway 414 . For the illustrated third lever 443, the third lever 443 can rotate relative to the handle 441 through the hinge H443 located at one end of the slideway 414 (rear end in FIG. Slide forward along the slideway 414 and slide forward relative to the handle 441 . In other words, the armrest locking assembly 44 can be switched from the state of FIG. 11A to the state of FIG. 11B , and can also be switched from the state of FIG. 11A to the state of FIG. 11C . As before, the four members (that is, the handle 441, the lock block 442, the third rod 443 and the branch 402) that make up the hinged four-bar mechanism A2 may not always be hinged to each other, but have mutual hinges to form the hinged four-bar mechanism The state of A2 (shown in Fig. 11A and Fig. 11B) has the state in which the third rod 443 is not hinged relative to the handle 441 but constitutes a crank slider mechanism (or a rocker slider mechanism) (as shown in Fig. 11A and Fig. 11B ). 11C).

In the illustrated embodiment, an elastic member S442 may be provided between the third rod 443 and the armrest 4, and the elastic force of the elastic member S442 makes the third rod 443 have a tendency to keep the locking block 442 at the locking position P441. For example, in Fig. 11A, a compression spring is arranged between the third rod 443 and the part above the third rod 443 of the armrest 4. As the elastic member S442, the elastic force of the compression spring makes the front end of the third rod 443 have a tendency to move backward. Tendency, through the pushing action of the third rod 443, the lock block 442 has a tendency to rotate clockwise around the hinge position B442 in FIG. In actual setting, it is easier to overcome the elastic force of the elastic member S442 when actively rotating the locking block 442 counterclockwise, but it is more difficult to overcome the elastic force of the elastic member S441. That is, the elastic member S442 provides the pre-tightening force of the locking block 442 .

The above structure enables the user not only to unlock the locking block 442 by pulling up or lifting the front end of the handle 441 at the front side, but also to actively pull the locking block 442 at the rear side to realize unlocking.

FIG. 10C shows an example configuration in which the armrest lock assembly 44 cooperates with the armrest 4 . The armrest 4 has a shell 45 extending forward and backward and having an inverted U-shaped cross section. Both the rod section 401 and the branch section 402 of the aforementioned armrest 4 can be provided by the casing 45 . Armrest lock assembly 44 may be housed within housing 45 . And the manipulation end (that is, the front end) of the handle 441 can be exposed at the front end of the housing 45 for manipulation to make the handle 441 rotate relative to the armrest 4 . In this way, it is convenient for the user to pull the handle 441 from the front side to switch the state of the armrest locking assembly 44 .

In the illustrated embodiment, the armrest assembly may include two handrail assemblies 40 . The two handrail assemblies 40 can be respectively installed to the installation sections 311 on the two sides of the backrest assembly 30 .

In the above handrail assembly 40, the user can unlock the state lock of the handrail folding assembly 43 with one hand without changing the sitting posture, so the armrest 4 can be folded with a small range of motion.

2.3. Manipulation component 90

In the illustrated embodiment, the folding wheelchair 800 may further include a control component 90 , which may be used to control the forward direction of the folding wheelchair 800 . The manipulation component 90 can be arranged at the front end of the armrest 4 . In this way, it is convenient for the user to control the forward direction of the folding wheelchair 800 when sitting on the folding wheelchair 800, which is also ergonomic. In the illustrated embodiment, the control assembly 90 can be arranged at the front end of the armrest 4 by being connected to the front end of the handle 441 , so that the whole structure is simpler and more compact.

Referring to FIG. 7A to FIG. 8B , the control assembly 90 may include a control seat 901 and a control bracket 902 , wherein the control bracket 902 may be arranged at the front end of the armrest 4 . The control seat 901 may be provided with a control lever 903 for manual control. The joystick 903 can be in any existing form, for example, it can be a rocker, and the user can manually manipulate the joystick 903, and the joystick 903 can convert its own motion into the control system of the folding wheelchair 800, as the aforementioned control unit can handle. electronic information to control the forward direction of the folding wheelchair 800 .

The control seat 901 can be foldably supported on the control bracket 902 and can be configured to operate in an open state (shown in FIG. 19A, see also FIG. 7A and FIG. Referring to the switching between FIG. 8A and FIG. 8B ), FIG. 19B also shows the control intermediate state switching from the manipulation open state of FIG. 19A to the manipulation collapse state of FIG. 19C . In the unfolded state of control in FIG. 19A , the control seat 901 is opened to the front side of the control bracket 902 , and the control rod 903 is exposed on the upper side of the control seat 901 . In the folded state of FIG. 19C , the control seat 901 is folded above the control bracket 902 , and the control lever 903 is located on the lower side of the control seat 901 . As shown in Figure 7A, the control bracket 902 can include a support plate 906 and two pillars 905 distributed left and right at the front end of the support plate 906, the rear end of the control seat 901 can be hinged with the two pillars 905, and the rear end of the control seat 901 It is arranged between two pillars 905 , so that the control seat 901 can be folded and supported on the control bracket 902 relative to the control bracket 902 . 7A and FIG. 7B in the open state of control, the control seat 901 and the support plate 906 of the control bracket 902 can be roughly in the state of opening 180°, while in the control folded state of FIG. 14 and FIG. 15 , the control seat 901 and the control The support plate 906 of the bracket 902 may be in a state of being folded at approximately 0°. In the figure, the support plate 906 may also have a placement hole 904, allowing the control rod 903 located at the lower side of the control seat 901 to pass through in the control and retracted state. The above-mentioned control seat 901 can protect its control rod 903 when it is folded (or called folding).

2.4. Backrest locking assembly 60

In the illustrated embodiment, the folding wheelchair 800 may further include a backrest locking assembly 60 . The backrest locking assembly 60 can keep the backrest assembly 30 in the backrest deployment position P301 relative to the seat cushion assembly 80 . The backrest locking assembly 60 can be seen in FIGS. 12 to 17 .

In the illustrated embodiment, the backrest locking assembly 60 may include a locking support 6 . The locking bracket 6 may be mounted to the cushion assembly 80 . The locking support 6 may be provided with a locking slot 62 . The backrest lock assembly 60 may also include a mating assembly 61 . The mating assembly 61 may be mounted to (the backrest frame 31 of) the backrest assembly 30 . The mating assembly 61 may be provided with a lock shaft 63 .

As mentioned above, (the backrest frame 31 of) the backrest assembly 30 can be rotatably mounted on the seat cushion assembly 80 via the hinge H30, for example. The backrest assembly 30 is set to be rotatable to the backrest deployment position P301, refer to Fig. 19A to Fig. 19R and Fig. 16A, both Fig. 16A and Fig. 19A to Fig. 19R show that the backrest assembly 30 is in the backrest deployment position P301. Referring to FIG. 19K and FIG. 16A , in the backrest deployment position P301 , the lock shaft 63 is snapped into the lock groove 62 , whereby the backrest assembly 30 is in the backrest deployment position P301 relative to the seat cushion assembly 80 . In other words, the backrest assembly 30 (the backrest frame 31 ) can be locked in the backrest unfolded position P301 relative to the seat cushion assembly 80 through the locking shaft 63 snapping into the locking groove 62 .

The backrest locking assembly 60 may further include a backrest locking elastic member S301. Back against the elastic force of the locking elastic member S301 has a tendency to keep the locking shaft 63 locked into the locking slot 62 . That is, the elastic force provided by the backrest locking elastic member S301 enables the backrest assembly 30 to remain in the backrest deployment position P301 relative to the seat cushion assembly 80.

The lock shaft 63 and the lock groove 62 of the above-mentioned backrest locking assembly 60 are respectively connected to the backrest assembly 30 and the seat cushion assembly 80 connected by the rotating pair, and the lock shaft 63 is snapped into the lock groove 62, so that the backrest assembly 30 is relatively The seat cushion assembly 80 is in the unfolded position P301 against the back, which is available for the user to lean against. In the folding wheelchair 800, in the unfolded state of the backrest, the angle α30 (shown in FIG. 16A ) between the backrest assembly 30 and the cushion assembly 80 is preferably 90-120°, more preferably 98-108°, as shown in the figure In the preferred embodiment, it is 103°, so as to improve the user's backrest comfort.

In the illustrated embodiment, the locking support 6 may include a locking block 601 and a base 602 . The locking block 601 provides the aforementioned locking groove 62 , and the locking block 601 is mounted on the base 602 , and the locking support 6 is mounted on the cushion assembly 80 through the base 602 . Referring to FIG. 14 , the locking block 601 may include two flat pieces 601b, 601a arranged at intervals (in the figure, along the left-right direction). The lock slot 62 can be considered to be jointly formed by two flat parts 601a, 601b respectively provided at the rear ends of the

notches

62a, 62b opening towards the rear side. Referring to FIG. 13 , the base 602 can be configured to include a bottom plate 602 a and mounting blocks 602 b extending upward from both sides of the bottom plate 602 a, and the two flat parts 601 a and 601 b constituting the locking block 601 can be respectively fixed and mounted to the base 602 by screws, for example. The opposite sides of the two mounting blocks 602b. Referring to FIG. 12 and FIG. 13 , the hinge shaft H30 passes through the mounting block 602 b of the base 602 , and the part of the backrest assembly 30 through which the hinge shaft H30 passes is disposed between the two mounting blocks 602 b. The base 602 may be mounted to the cushion assembly 80 via the bottom plate 602a.

In the illustrated embodiment, the mating assembly 61 may include a locking bracket 65 . The locking bracket 65 can be rotatably installed on the backrest assembly 30 . The lock shaft 63 is disposed at one end 651 of the lock bracket 65 , as shown in FIG. 12 . In Fig. 12, the locking bracket 65 is hinged to the backrest assembly 30, for example, through the hinge shaft H65, and the lock shaft 63 is arranged at the rear end of the locking bracket 65, and can rotate relative to the backrest assembly 30 as the locking bracket 65 rotates around the hinge axis H65. Activity. This structure is convenient for the lock shaft 63 to snap into the lock groove 62 .

In the illustrated embodiment, the backrest locking elastic member S301 may be disposed between the locking bracket 65 of the mating assembly 61 and the backrest assembly 30 . For example, referring to FIG. 15 , the locking bracket 65 may have a front wall 653 and two protruding arms 654 respectively protruding from both sides of the front wall toward the rear side. The front wall 653 and the two protruding arms 654 roughly form a U-shaped structure. The U-shaped structure of the locking bracket 65 can contain the standpipe 313 (or, the installation section 311) of the backrest assembly 30 from the front side, and the hinge H65 passes through the two protruding arms 654 of the locking bracket 65 and is contained between the two protruding arms 654. The standpipe 313 between them is used to realize the rotatable installation of the locking bracket 65 on the backrest assembly 30 . The backrest locking elastic member S301 may be a compression spring, which is connected between the front wall 653 of the locking bracket 65 and the standpipe 313. FIG. Compression spring of elastic member S301. And the lock shaft 63 is arranged horizontally between the two protruding arms 654 . As the lock bracket 65 rotates relative to the hinge shaft H65 around the direction that the lock shaft 63 snaps into the lock groove 62, the compression deformation of the compression spring decreases gradually, thus, the elastic force of the compression spring can make the lock bracket 65 have Rotate the lock shaft 63 in the direction of locking into the lock slot 62 . In FIG. 15 , the locking bracket 65 rotates around the direction in which the lower end 651 moves forward, and the locking shaft 63 will snap into the locking slot 62 . The above-mentioned structure is simple in construction and more compact in arrangement.

In the illustrated embodiment, corresponding to each vertical tube 313 of the backrest frame 31 of the backrest assembly 30 , a backrest locking assembly 60 may be provided respectively. In the illustrated embodiment, an unlocking lever 66 is connected between an end 652 (shown in FIG. 12 ) opposite to the locking shaft 63 of the two locking brackets 65 that are backed by the locking assembly 60, and the unlocking lever 66 can be manipulated manually, so that The locking bracket 65 is rotated until the locking shaft 63 disengages from the locking groove 62, so as to realize the manual unlocking of the backrest deployment position P301.

2.5. Unlock component 70

Referring to FIGS. 12 to 17 , the armrest assembly of the folding wheelchair 800 may further include an unlocking assembly 70 . The unlocking component 70 can release the state locking of the backrest component 30 relative to the seat cushion component 80 by the backrest locking component 60 .

In the illustrated embodiment, the unlocking assembly 70 may include a trigger lever 71 and an unlocking member 72 . The trigger lever 71 is rotatably mounted to the cushion assembly 80 . In the figure, the trigger lever 71 is rotatably mounted to the base 602 of the locking support 6 , for example, via a hinge H70 , thereby being rotatably mounted to the cushion assembly 80 . The unlocking member 72 is movably supported on the locking support 6, and is configured to be pushed by one end of the trigger lever 71 (in FIG. 14, the upper end 712 of the trigger lever 71) as the trigger lever 71 rotates, thereby pushing the lock shaft 63 to disengage. The lock groove 62, whereby the backrest assembly 30 is unlocked from the backrest deployment position P301. 13 to 14 and 16A to 16B, the trigger lever 71 is rotatably mounted to the cushion assembly 80 (not shown in FIGS. The trigger end 711 (lower end in the figure) of the lever 71, the trigger lever 71 rotates around the hinge H70, so far, the upper end 712 of the trigger lever 71 will contact and push the unlocking part 72 to move backward, so the unlocking part 72 will push the lock backward. shaft 63, so that the lock shaft 63 disengages from the lock groove 62, thereby reaching the state of FIG. 16B.

In the illustrated embodiment, by turning the backrest assembly 30 relative to the cushion assembly 80 (or the locking support 6) to leave the backrest deployment position P301, such as reaching the backrest intermediate position P300 in FIG. 16B , the lock shaft 63 is disengaged from the lock The slot 62 allows the backrest assembly 30 to be folded relative to the cushion assembly 80 to the backrest folding position P302 shown in FIG. 16C under the action of gravity. In the middle position of backrest P300, the backrest assembly 30 is tilted forward. The included angle α30 between the back assembly 30 and the horizontally extending cushion assembly 80 is less than 90°.

The structure of the above-mentioned unlocking assembly 70 allows the lock shaft 63 to be pushed out from the lock groove 62 quickly and conveniently only by pulling the trigger lever 71, so that the backrest assembly 30 can be disengaged from the backrest deployment position P301, for example, under the action of gravity. Reaching the backrest folding position P302, the structure is simple, and the function of unlocking with simple operation can be realized.

16A and 16B, the unlocking assembly 70 may further include an elastic member S70, the elastic force of the elastic member S70 has a tendency to make the trigger lever 71 push the unlocking member 72, that is, the elastic force of the elastic member S70 has the ability to disengage the lock shaft 63 Lock slot 62 trend. For example, the elastic member S70 can be a torsion spring arranged around the hinge axis H70, one end of the torsion spring abuts against the trigger end 711 of the trigger lever 71, and the other end abuts against the base 602 such as its bottom plate 602a, thus, as an elastic member The torsion spring of S70 always has a tendency to push the trigger end 711 of the trigger lever 71 , that is, its elastic force has a tendency to make the trigger lever 71 push the unlocking member 72 .

In the illustrated embodiment, the locking block 601 is provided with a sliding groove 603 on both sides (left and right in the figure). 13 to 14, each flat piece (for example, 601a) is provided with a sliding groove 603 on the side opposite to another flat piece (for example, 601b), so that the locking block 601 provides a sliding slot on both sides. Groove 603. This installation structure can provide enough space for activities and makes the structure more compact.

The unlocking member 72 may include two side walls 721 and a bottom wall 722 forming a U shape. The two sidewalls 721 are slidingly matched with the sliding slots 603 on both sides of the locking block 601 respectively. And the bottom wall 722 is promoted by the trigger rod 71 (in the figure, its upper end 712), and the free ends of the two side walls 721 (that is, the end opposite to the end connected with the bottom wall 722, among the figures, the rear end) promote For the lock shaft 63, refer to FIG. 16A to FIG. 16B.

In the illustrated embodiment, the two ends of the lock slot 62 in the slot length direction may respectively communicate with the slide slots 603 on both sides of the lock block 601 . The lock groove 62 extends along the left and right, that is, the groove length direction of the lock groove 62 is the left and right direction. Lock groove 62 is at left end (constituting the left end of the left side notch 62b of lock groove 62), right end (constituting the right end of the right side notch 62a of lock groove 62) respectively with locking block 601 at the chute 603 of left side (constituting locking The chute 603 of the flat part 601b of the block 601) and the chute 603 on the right side (the chute 603 of the flat part 601a constituting the locking block 601) communicate.

Free ends of the two sidewalls 721 are respectively provided with protrusions 723 protruding toward each other, and the protrusions 723 are stopped by the groove bottom 621 of the locking groove 62 . That is, referring to FIG. 13 and FIG. 14 , the rear end of the left side wall 721 is provided with a protrusion 723 protruding to the right, and the rear end of the right side wall 721 is provided with a protrusion 723 protruding to the left. The hook 723 is hooked to the groove bottom 621 of the lock groove 62 , that is, is stopped by the groove bottom 621 of the lock groove 62 . In the above structure, the groove bottom 621 of the locking groove 62 stops the protrusion 723 of the side wall 721, which can limit the forward displacement of the unlocking member 72, and the locking block 601 stops the bottom wall 722, which can limit the backward displacement of the unlocking member 72. The chute 603 can not only guide the unlocking member 72 to move back and forth to push the lock shaft 63, but also limit the unlocking member 72 in the up and down direction, so the unlocking member 72 is reliably installed on the locking block 601 and can slide forward and backward for a certain distance. Preferably, when the unlocking member 72 is at the position shown in FIG. Only by overcoming the elastic force of the elastic member S70 can it enter the locking groove 62 .

In the illustrated embodiment, the elastic force of the elastic member S70 can make the protrusion 723 of the side wall 721 of the unlocking member 72 block the opening of the lock groove 62, prevent the lock shaft 63 from entering the lock groove 62, and thus lean against the locking elastic member S301 so that The force of the lock shaft 63 snapping into the lock groove 62 can overcome the force of the elastic member S70 preventing the lock shaft 63 from entering the lock groove 62 . For example, the elastic force of the back-to-lock elastic member S301 may be greater than the elastic force of the elastic member S70. The backrest assembly 30 can be manually rotated to (or close to) the backrest deployment position P301. Under the elastic force of the backrest locking elastic member S301, the lock shaft 63 can push the unlocking member 72 from the position in FIG. 14 to the position in FIG. 13 At the same time, the lock shaft 63 can also enter the lock groove 62 to realize the opening or unfolding of the backrest assembly 30 and fix it. In the illustrated embodiment, the locking support 6 also has a bayonet 7 . The backrest assembly 30 is configured to be rotatable to the handle deployment position P303 via the backrest deployment position P301 , that is, to rotate from the status position in FIG. 16A to the status position in FIG. 17 . As shown in FIG. 17 , the lock shaft 63 is snapped into the bayonet 7 , whereby the backrest assembly 30 is in the handle unfolded position P303 relative to the seat cushion assembly 80 . In the folding wheelchair 800, at the handle unfolded position P303, the angle α30 between the backrest assembly 30 and the seat cushion assembly 80 is preferably 180-220°, more preferably 188-198°, and is 193° in the illustrated preferred embodiment .

In this way, for the folding wheelchair 800, starting from the folded state C23 in FIG. 20 , the backrest assembly 30 is rotated from the backrest folding position P302 to the handle unfolding position P303 relative to the seat cushion assembly 80, and the rolling of the pedal assembly 50 of the front wheel assembly 10 The wheels 54 can be similar to the small rollers of the luggage, and the backrest assembly 30 is similar to the pull rod, handle or handle of the luggage, and the cushion assembly 80 is similar to the box of the luggage, thereby forming the luggage mode in FIG. 18 , The entire folding wheelchair 800 can be pulled.

Referring to Fig. 14, the bayonet 7 is a notch that is open on both sides in the locking support 6. In the figure, it is a notch that is open on both the front side and the lower side provided under the locking block 601 of the locking support 6. Such a notch structure can make It is easy for the user to operate to make the lock shaft 63 disengage from the bayonet socket 7 . In the figure, the rotation direction of the backrest assembly 30 from the backrest unfolded position P301 to the handle unfolded position P303 and from the backrest unfolded position P301 to the backrest folded position P302 is opposite.

In the illustrated embodiment, the locking block 601 of the locking support 6 can provide a smooth rolling surface 6011 for guiding the locking shaft 63 into the locking groove 62 , for example, from FIG. 16B to FIG. 16A . “Smooth rolling surface 6011 ” means that the curvature of every point of the rolling surface 6011 on the rolling path of the lock shaft 63 is continuous. Similar to the rolling surface 6011 , the locking block 601 can also provide a smooth rolling surface 6012 for guiding the lock shaft 63 to snap into the bayonet 7 , for example from FIG. 16A to FIG. 17 . The flat parts 601 a , 601 b constituting the locking block 601 may both have part of side surfaces extending along arcs, so as to form

smooth rolling surfaces

6011 , 6012 . Preferably, the lock shaft 63 is a circular shaft, which facilitates rolling along the rolling

surfaces

6011 and 6012 . The arcs extended by the rolling

surfaces

6011 and 6012 may be consistent.

In the illustrated embodiment, when the above-mentioned unlocking assembly 70 is used in the illustrated folding wheelchair 800, it can cooperate with the rear wheel assembly 20 (shown in FIG. 19S ) of the folding wheelchair 800 to rotate and fold toward the seat cushion assembly 80 to be automatically unlocked.

In the illustrated embodiment, the folding wheelchair 800 can be set such that, when the rear wheel frame 22 of the rear wheel assembly 20 is rotated and folded from the rear wheel deployment position P201 to the rear wheel deployment position P202 relative to the seat cushion assembly 80, the rear wheel frame 22 Pushing the trigger lever 71 of the unlocking assembly 70 makes the trigger lever 71 rotate, and then the trigger lever 71 pushes the lock shaft 63 out of the lock groove 62 . As shown in FIG. 13 , the trigger end 711 of the trigger lever 71 may be provided with a roller 711 a, and the rear wheel frame 22 rolls in contact with the trigger end 711 of the trigger lever 71 .

It can be understood that during the process of the rear wheel frame 22 of the rear wheel assembly 20 relative to the seat cushion assembly 80 from the rear wheel deployment position P201 to the rear wheel deployment position P202, the rear wheel frame 22 does not need to be pushed all the way to trigger the unlocking assembly 70 rod 71, but can begin to push the trigger rod 71 at a certain position in this process, for example, the middle position P200 of the rear wheel shown in Figure 19S, and the rear wheel frame 22 starts to contact the trigger rod 71 of the push unlock assembly 70. The roller 711a of the trigger end 711.

Therefore, starting from the state of FIG. 19S , the backrest assembly 30 starts to automatically rotate and fold relative to the seat cushion assembly 80 from the backrest unfolded position P301 to the backrest folded position P302 under the action of gravity. That is, when the rear wheel frame 22 of the rear wheel assembly 20 is rotated and folded from the rear wheel unfolded position P201 to the rear wheel intermediate position P200 shown in FIG. The trigger end 711 of the rod 71, the rear wheel frame 22 continues to rotate and fold relative to the seat cushion assembly 80 from the middle position P200 of the rear wheel, and the rear wheel frame 22 will automatically pull the trigger end 711 of the trigger rod 71. The unlocking assembly 70 unlocks the backrest deployment position P301 caused by the locking shaft 63 being locked into the lock groove 62, so the backrest assembly 30 is disengaged from the backrest deployment position P301, as shown in FIGS. 16A to 16B , under the action of gravity Reach the back-to-fold position P302, as shown in Figure 19V. That is, during the folding process of the folding wheelchair 800, the seat cushion assembly 80 of the folding wheelchair 800 is approximately in a vertical position, and the rear wheel frame 22 of the folding wheelchair 800 is in contact with the trigger end 711 of the trigger lever 71, thereby pushing and touching the trigger lever 71. When the unlocking part 72 is contacted, the unlocking part 72 will push out the lock shaft 63 in the lock groove 62, and the unlocked backrest assembly 30 will automatically fold under the action of gravity.

2. Folding method

The present invention also provides a folding method F0 for folding the wheelchair. The folding wheelchair is described with reference to the folding wheelchair 800 provided above, but it can be understood that the folding method F0 provided by the present invention is not limited to the folding wheelchair 800 with the above structure. The following will exemplarily describe the folding method F0 of the folding wheelchair provided by the present invention with reference to FIGS. 19A to 20 .

For the folding method F0, the folding wheelchair 800 may include a cushion assembly 80 , a front wheel assembly 10 and a rear wheel assembly 20 .

The folding method F0 includes steps S1, S2, and S3 described below.

Step S1: From the front and rear wheel unfolded state C11 (as shown in Figure 19K), in the state where the front roller 11 of the front wheel assembly 10 and the rear roller 21 of the rear wheel assembly 20 are supported on the support surface G0, the front wheel assembly 10 (as the example of the first party in the front wheel assembly 10 and the rear wheel assembly 20 in the figure) turn and fold towards the cushion assembly 80 around the front rotation axis O1 (as the example of the first rotation axis in the figure), until the front wheel assembly 10 (as an example of the aforementioned first party in the figure) until the first intermediate state C17 (as shown in FIG. ) is arranged at the connection between the front wheel assembly 10 (as an example of the aforementioned first party) and the cushion assembly 80 (in the figure, the front connection position P1).

This process can be regarded as the process of the folding wheelchair 800 "kneeling" towards the front side.

For example, the front and rear wheel deployment state C11 is shown in FIG. The frame 22 is in an unfolded state relative to the cushion assembly 80 (that is, both are approximately in a standing state) so that the user can sit on the cushion assembly 80 . In Fig. 19K, under the state C11 of front and rear wheel expansion, the front wheel assembly 10 (the front wheel frame 12) can be in the front wheel expansion position P121 relative to the cushion assembly 80, and the rear wheel assembly 20 (the rear wheel frame 22) can be relative to the seat cushion assembly 80. The seat cushion assembly 80 is in the unfolded position P201 of the rear wheels.

The first intermediate state C17 (as shown in FIG. 19Q ) is shown in FIG. 19Q , wherein “the front wheel assembly 10 is horizontally supported on the support surface G0” means that, compared with the front and rear wheel unfolded state C11, the front wheel assembly 10 is particularly It is that the front wheel frame 12 is in a horizontal state with respect to the support surface G0 instead of a standing state, or the front wheel assembly 10 is stably supported on the support surface G0 by at least two front and rear fulcrums when viewed from the side, rather than only by the front rollers 11 This is a fulcrum support. In other words, for the illustrated embodiment, from the unfolded state C11 of the front and rear wheels shown in FIG. 19K to the first intermediate state C17 (as shown in FIG. 19Q ) shown in FIG. The support becomes jointly supported by the front roller 11 of the front wheel assembly 10 and other parts. In Fig. 19Q, in the first intermediate state C17 (as shown in Fig. 19Q), the front wheel assembly 10 (the front wheel frame 12) can be between the front wheel unfolded position P121 and the front wheel folded position P122 relative to the seat cushion assembly 80 The front wheel intermediate position P120, the rear wheel assembly 20 (the rear wheel frame 22) can be in the rear wheel unfolded position P201 relative to the seat cushion assembly 80.

Step S2: From the first intermediate state C17 (shown in FIG. 19Q ), in the state where the front wheel assembly 10 (as an example of the aforementioned first party in the figure) is horizontally supported on the support surface G0, the seat cushion assembly 80 The forward rotation axis O1 (in the figure as an example of the first axis of rotation) rotates and expands relative to the front wheel assembly 10 (in the figure as an example of the aforementioned first party), and at the same time, the rear wheel assembly 20 (in the figure as an example of the front wheel assembly 10 and the example of the second party in the rear wheel assembly 20) around the rear rotation axis O2 (as the example of the second rotation axis in the figure) relative to the seat cushion assembly 80 to rotate and fold until the seat cushion assembly 80 is close to the front rotation axis O1 (in the figure The first folded state C20 (as shown in FIG. 19T ) is supported on the support surface G0 by the end 804 (the front end of the seat cushion assembly 80 in the normal use state in the figure) at the position where it is used as an example of the first rotation axis) So far, wherein, the rear rotation axis O2 (in the figure as an example of the second rotation axis) is set at the connection between the rear wheel assembly 20 (in the figure as an example of the aforementioned second party) and the cushion assembly 80 (in the figure, the rear connection position P2).

It should be understood that in step S2, "the seat cushion assembly 80 rotates and unfolds around the front rotation axis O1, and at the same time, the rear wheel assembly 20 rotates and folds relative to the seat cushion assembly 80" means that at least for a period of time, the two rotational movements are performed simultaneously, and the two The turning motions can start at different times and end at different times. Preferably, in the illustrated embodiment, the two rotational movements start at the same time, but do not end at the same time.

The first folded state C20 is shown in FIG. 19T, wherein, "the end 804 of the cushion assembly 80 is supported on the support surface G0" can be understood as that the end 804 of the cushion assembly 80 is stabilized by at least two fulcrums from the front and rear when viewed from the side. Supported on the support surface G0, the at least two front and rear fulcrums may directly contact the support surface G0, or as in the illustrated embodiment, indirectly contact the support surface G0 through the pedal 53 and the rolling wheel 54. Alternatively, "the end portion 804 of the cushion assembly 80 is supported on the support surface G0" can be understood as the center of gravity of the cushion assembly 80 passes through the end surface of the end portion 804 from the side.

In the process from the first intermediate state C17 shown in FIG. 19Q (as shown in FIG. 19Q ) to the first folded state C20 shown in FIG. 19T , the folding wheelchair 800 is supported from the front wheel assembly 10 while the rear roller 22 Support becomes the horizontal support of the front wheel assembly 10 alone, and then becomes the support of the end 804 of the cushion assembly 80 (in the figure, indirectly through the pedal 53 and the rolling wheel 54). In Fig. 19T, under the first folded state C20, the front wheel assembly 10 (the front wheel frame 12) can return to the front wheel with respect to the cushion assembly 80 (more precisely, the seat cushion assembly 80 is relative to the front wheel frame 12). The unfolded position P121, and the rear wheel assembly 20 (the rear wheel frame 22 ) can be in the rear wheel folded position P202 relative to the seat cushion assembly 80 .

Step S3: From the first folded state C20 (as shown in FIG. 19T ), in the state where the aforementioned end portion 804 of the cushion assembly 80 is supported on the supporting surface G0, make the front wheel assembly 10 (as the aforementioned first side in the figure) example) around the front rotation axis O1 (as an example of the first rotation axis in the figure) to the seat cushion assembly 80 to rotate and fold to the second folded state C23 (as shown in FIG. 20 ).

The second folded state C23 is shown in FIG. 20 . In the illustrated second folded state C23 , the front wheel assembly 10 (the front wheel frame 12 ) can be rotated and folded to the front wheel folded position P122 relative to the seat cushion assembly 80 . In FIG. 20 , in the second folded state C23 , the front wheel assembly 10 (the front wheel frame 12 ) can be in the front wheel folded position P122 relative to the seat cushion assembly 80 .

It can be understood that, in another embodiment, the rear wheel assembly 20 can also be used as an example of the aforementioned first party, that is, first, the rear wheel assembly 20 is rotated and folded around the rear rotation axis O2, in other words, the folding wheelchair 800 faces the rear side "kneel". Preferably, as in the illustrated embodiment, the aforementioned first party is the front wheel assembly 10 , that is, the second party is the rear wheel assembly 20 . The inventor considers that most elderly people need to lean against the backrest assembly 30 when using a wheelchair, and the overall center of gravity is relatively rearward. Therefore, the overall structural center of gravity of the folding wheelchair is also relatively rearward. In addition, the front wheel assembly 10 is rotated and folded first, which also facilitates the folding of the pedal assembly 50 when the front wheel assembly 10 is provided with the pedal assembly 50 .

In the illustrated embodiment, the folding wheelchair 800 may further include the first driving assembly 100 and/or the second driving assembly 200 as mentioned above. The first drive assembly 100 may include a first movable part 101 and a first connecting arm 102, the first movable part 101 is movably arranged on the cushion assembly 80 forward and backward, and the two ends of the first connecting arm 102 are respectively hinged to the first movable part 101 And front wheel assembly 10 (in the figure as the example of aforementioned first party). The second drive assembly 200 may include a second movable part 201 and a second connecting arm 202, the second movable part 201 is movably arranged on the cushion assembly 80 back and forth, and the two ends of the second connecting arm 202 are respectively hinged to the second movable part 201 And rear wheel assembly 20 (in the figure as the example of the aforementioned second party).

In the illustrated folding method F0, the front wheel assembly 10 (as an example of the aforementioned first party in the figure) can be driven by the first connecting arm 102 by making the first driving unit 103 drive the first movable member 101 to move back and forth. and/or, the rear wheel assembly 20 (as an example of the aforementioned second party in the figure) can be driven by the second drive unit 203 to drive the second movable member 201 to move forward and backward Driven by the second connecting arm 202 , the seat cushion assembly 80 is rotated and unfolded or folded.

For example, in the folding method F0, the front wheel assembly 10 (as an example of the aforementioned first party in the figure) and/or the rear wheel assembly can be determined by detecting the movement position of the first movable part 101 and/or the second movable part 201 20 (as an example of the aforementioned second party in the figure) relative to the unfolded and folded state of the cushion assembly 80.

As an example, for example, when the proximity sensor detects that the first movable member 101 reaches the moving position shown in FIG. Movement, so that the seat cushion assembly 80 is rotated and unfolded relative to the front wheel assembly 10 , and at the same time, the second driving unit 203 is triggered to drive the second movable member 201 to move forward to drive the rear wheel assembly 20 to rotate and fold relative to the seat cushion assembly 80 . For another example, in step S1, in the process of "kneeling" the folding wheelchair 800 toward the front side, a trigger signal may be transmitted to the controller through a control handle such as a remote controller, so that the controller transmits an activation signal to the first drive unit 103, so that the second A driving unit 103 drives the first movable part 101 to move backward, so that the front wheel assembly 10 is rotated and folded relative to the seat cushion assembly 80, and the entire folding wheelchair 800 kneels down.

In the above folding method F0, the shift of the center of gravity can be realized by selectively changing the positions of the front wheel assembly 10 and the rear wheel assembly 20, especially in step S2, by controlling the rotational unfolding speed between the front wheel assembly 10 and the seat cushion assembly 80 And the rotation and folding speed between the rear wheel assembly 20 and the cushion assembly 80, for example, by controlling the speed of motion of the first movable part 101 and the second movable part 102, can well control the transfer of the center of gravity of the entire folding wheelchair 800, so that The whole folding process went smoothly.

For example, in the folding wheelchair 800, the weight of the left and right rear wheel assemblies 20 can account for about 1/3 of the weight of the entire wheelchair, and the center of gravity of the entire wheelchair can be greatly changed by changing its position. 20 can be positioned under the wheelchair cushion 802 in the folded state, and can be positioned at the rear side of the wheelchair cushion 802 in the unfolded state. the front.

In the illustrated folding method F0, when the rear wheel assembly 20 (as the example of the aforementioned second party in the figure) is rotated and folded relative to the seat cushion assembly 80, the rear wheel assembly 20 (as the example of the aforementioned second party in the figure) avoids For the front wheel assembly 10 (in the figure as an example of the aforementioned first party), refer to FIG. 19R.

In the illustrated folding method F0, when the rear wheel assembly 20 (as the example of the aforementioned second party in the figure) is rotated and folded relative to the seat cushion assembly 80, the rear wheel assembly 20 (as the example of the aforementioned second party in the figure) The rolling axis of the rear roller 21 (as an example of a roller in the figure) is changed from extending along the side of the cushion assembly 80 to extending along the thickness direction T80 of the cushion assembly 80 , as can be referred to the comparison of FIG. 19Q and FIG. 19T .

As mentioned above, the front wheel assembly 10 may include a front wheel frame 12 supporting the front rollers 11 , and the front wheel assembly 10 is rotatably connected to the cushion assembly 80 through the upper end of the front wheel frame 12 . In the illustrated embodiment, the front wheel assembly 10 of the folding wheelchair 800 may further include a pedal assembly 50 . The pedal assembly 50 may include a pedal assembly 51 and a scroll wheel 54 . Wherein, the pedal assembly 51 may include a pedal arm 52 and a pedal 53 . The upper end of the pedal arm 52 can be rotatably arranged on the front wheel frame 12 , and the pedal 53 can be connected with the lower end of the pedal arm 52 . The scroll wheel 54 can be disposed on the pedal assembly 51 .

In the illustrated folding method F0, the folding wheelchair 800 reaches the second intermediate state C15 (as shown in FIG. 19O ) from the unfolded state C11 of the front and rear wheels (as shown in FIG. The first intermediate state C17 (as shown in Figure 19Q), in the process from the second intermediate state C15 (as shown in Figure 19O) to the first intermediate state C17 (as shown in Figure 19Q), the rolling wheel 54 is on the supporting surface Rolling on G0 drives the pedal arm 52 of the pedal assembly 51 to rotate and unfold relative to the front wheel frame 12 .

In the illustrated folding method F0, the pedal 53 can be rotated relative to the pedal arm 52 to the first pedal unfolded position P531 and the second pedal unfolded position P533. Wherein, the angle α53 between the pedal 53 and the pedal arm 52 is respectively the first predetermined value V1 and the second predetermined value V2 at the first pedal deployment position P531 and the second pedal deployment position P533, and the second predetermined value V2 is greater than The first predetermined value V1. As mentioned above, the footrest assembly 51 in the first pedal unfolded position P531 can allow the user to place the foot on the pedal 53 . The first predetermined value V1 may be, for example, 105° to 135°.

In the illustrated folding method F0, the folding wheelchair 800 can reach the first intermediate state C17 (as shown in FIG. 19Q ) from the second intermediate state C15 (as shown in FIG. 19O ) via the third intermediate state C16 (as shown in FIG. 19P ). ). In the process from the second intermediate state C15 (as shown in FIG. 19O ) to the third intermediate state C16 (as shown in FIG. 19P ), the pedal 53 can be kept at the first pedal extended position P531 relative to the pedal arm 52 . In the process from the third intermediate state C16 (as shown in FIG. 19P ) to the first intermediate state C17 (as shown in FIG. 19Q ), the pedal 53 can be rotated from the first pedal deployment position P531 relative to the pedal arm 52 Deploy to the second pedal deployment position P533. As mentioned above, the second predetermined value V2 corresponding to the second pedal deployment position P533 may be 175-185°. Therefore, the pedal 53 can be rotated relative to the pedal arm 52 from the first pedal unfolded position P531 to a flat position where the pedal 53 is substantially flush with the support surface G0, without interfering with the subsequent folding action.

It should be understood that the second intermediate state C15 (as shown in FIG. 19O ) is not necessarily the initial state in which the scroll wheel 54 starts to contact the support surface G0 but may be a state in which the scroll wheel 54 has been in contact with the support surface G0 for a period of time. For example, in the illustrated embodiment, the folding wheelchair 800 also goes through the intermediate states C12 and C13 sequentially during the process from the unfolded state C11 of the front and rear wheels (as shown in FIG. 19K ) to the second intermediate state C15 (as shown in FIG. 19O ). and C14. In the intermediate state C12, the front end of the pedal 53 of the pedal assembly 50 begins to contact the supporting surface G0; then the pedal 53 of the pedal assembly 50 is gradually flattened to the intermediate state C13. The angle α53 between the plates 53 can be slightly reduced; then from the intermediate state C13 to the intermediate state C14, under the state where the pedal 53 is flat on the support surface G0, the rolling wheel 54 rolls forward, during this process , the angle α53 between the pedal arm 52 and the pedal 53 can be slightly increased; The angle α53 returns to the angle at which the pedal 53 is in the first pedal deployed position P531 relative to the pedal arm 52 .

In the illustrated folding method F0, during the process from the second intermediate state C15 (as shown in FIG. 19O ) to the third intermediate state C16 (as shown in FIG. 19P ), a limiting device (for example, the aforementioned The limit device 55 of the pedal assembly 50) makes the pedal 53 remain in the first pedal unfolded position P531 relative to the pedal arm 52, and makes the pedal arm 52 rotate to the pedal retracted position P522 relative to the front wheel frame 12 (as shown in Figure 19P As shown, also refer to Fig. 5B), and make in the pedal folded position P522, the front wheel frame 12 releases the limit effect of the limit device 55, thereby, the pedal 53 under the action of gravity relative to the pedal arm 52 from The first pedal deployment position P531 shown in FIG. 19P rotates to the second pedal deployment position P533 shown in FIG. 19Q, thereby arriving at the first intermediate state C17 from the third intermediate state C16 (as shown in FIG. 19P) (as shown in FIG. 19Q Show).

For example, as mentioned in the previous description of the pedal assembly 50, the force application portion 123 of the front wheel frame 12 can contact the limit rod 56 of the limit device 55 shown in FIGS. 3 to 5B to apply compression to the limit rod 56. Force, so that the limit rod 56 can release the cooperation with the expansion matching portion 531a of the connecting portion 531 of the pedal 53, so that the limit function of the limit device 55 can be released.

In the illustrated folding method F0, in the second folded state C23 shown in FIG. 20 , the pedal arm 52 can be kept at the pedal retracted position P522 relative to the front wheel frame 12 . For example, the buckling portion 520 of the pedal arm 52 and the buckling portion 102a of the first connecting arm 102 shown in FIGS. 3 to 5B can be fastened to each other, so that the pedal arm 52 is kept at the pedal retracted position P522.

In the illustrated folding method F0, in the second folded state C23 shown in FIG. 20 , the pedal 53 can be held at the pedal retracted position P532 with respect to the pedal arm 52 . For example, the stopper 58 of the stopper 55 shown in FIG. 3 to FIG. 5B can cooperate with the retractable matching part 531b of the connecting part 531 of the pedal 53, so that the pedal 53 is kept at the pedal retracted position P532 .

As mentioned above, the rear wheel assembly 20 includes a rear wheel frame 22 supporting the rear rollers 21 , and the rear wheel assembly 20 can be rotatably connected to the cushion assembly 80 through the upper end of the rear wheel frame 22 .

In the illustrated embodiment, the folding wheelchair 800 may include a backrest assembly 30 foldably mounted on a seat cushion assembly 80 . The folding wheelchair 800 may further include a backrest locking assembly 60 for locking the backrest assembly 30 in the unfolded backrest position P301 relative to the seat cushion assembly 80 . The folding wheelchair 800 may further include an unlocking component 70 for unlocking the backrest component 30 from the unfolded position P301 of the backrest.

In the illustrated folding method F0, in the process from the first intermediate state C17 (as shown in FIG. 19Q ) to the first folded state C20 (as shown in FIG. 19T ), the rear wheel frame 22 of the rear wheel assembly 20 can be made During the process of folding relative to the seat cushion assembly 80 , the unlocking assembly 70 is triggered to unlock the backrest assembly 30 from the backrest unfolded position P301 , so that the backrest assembly 30 is folded relative to the seat cushion assembly 80 under the action of gravity.

In the illustrated embodiment, the backrest assembly 30 may have a vertically extending installation segment 311 on the side. The folding wheelchair 800 may also include armrests 4 .

In the illustrated folding method F0, before the backrest assembly 30 is folded relative to the seat cushion assembly 80 under the action of gravity, the armrest 4 may be folded relative to the installation section 311 of the backrest assembly 30 . For example, as shown in FIG. 19D to FIG. 19H , the armrest 4 can be folded relative to the installation section 311 through the hinge four-bar mechanism A1 . This folding operation can be performed manually. In the folded state of the armrest shown in FIG. 19H , the angle α43 between the armrest 4 and the installation section 311 may be -10-20°.

In the illustrated embodiment, the folding wheelchair 800 may include a control component 90 for controlling the forward direction of the folding wheelchair 800 . As mentioned above, the control assembly 90 may include a control seat 901 and a control bracket 902 , wherein the control bracket 902 may be arranged at the front end of the armrest 4 . The control seat 901 may be provided with a control lever 903 for manual control. The control seat 901 can be foldably supported on the control bracket 902 .

In the illustrated folding method F0, before the backrest assembly 30 is folded relative to the seat cushion assembly 80 under the action of gravity, further, before the armrest 4 is folded relative to the installation section 311, the control bracket 902 is opened from the control state (as shown in FIG. 19A) to switch to the control folded state (as shown in FIG. 19C). As shown in FIG. 19A , in the open state of the control, the control seat 901 is opened to the front side of the control bracket 902 , and the control rod 903 is exposed on the upper side of the control seat 901 . As shown in FIG. 19C , in the folded control state, the control seat 901 is folded above the control bracket 902 , and the control lever 903 is located on the lower side of the control seat 901 .

In the illustrated embodiment, the backrest assembly 30 may include a backrest frame 31 and a cushion 32 providing a backrest surface 321 , and the backrest assembly 30 may be foldably installed on the seat cushion assembly 50 through the backrest frame 31 .

In the illustrated folding method F0, before the backrest assembly 30 is folded relative to the seat cushion assembly 80, the backrest 32 can be pushed from the backrest push-out position P321 to the backrest folding position P322 relative to the backrest frame 31, wherein the backrest 32 is placed on the backrest. The pushed-out position P321 is closer to the front side than the cushion-folded position P322. For example, referring to FIG. 19G to FIG. 19K , the back cushion 32 can be pushed from the back cushion pushing position P321 to the back cushion folding position P322 relative to the backrest frame 31 through the hinge four-bar mechanism A3 .

21A to 21I show part of the process of unfolding the folding wheelchair 800 from the folded state C23 shown in FIG. 20 .

From the folded state C23 shown in FIG. 20 to the state of FIG. 21B via the state of FIG. 21A, the first movable member 101 moves downward, and the front wheel frame 12 of the front wheel assembly 10 is driven relative to the seat cushion assembly by the first connecting arm 102. 80 rotate and deploy to the state where the front wheel frame 12 is placed horizontally, as shown in Figure 21B. In addition, it should be understood that the folding wheelchair 800 in the folded state C23 shown in FIG. The lower side part 806 is supported on the support surface G0, and it starts to unfold from this state. At this time, the movement of the first movable part 101 can also drive the seat cushion assembly 80 to rotate and unfold relative to the front wheel frame 12 of the front wheel assembly 10, as shown in FIG. 21B status.

From the state of FIG. 21B, the rear wheel frame 22 of the rear wheel assembly 20 rotates and unfolds relative to the cushion assembly 80, as shown in FIG. 21C, and then simultaneously, the seat cushion assembly 80 rotates and folds relative to the front wheel frame 12 of the front wheel assembly 10 As shown in Fig. 21D, until the state shown in Fig. 21E. Similar to the previous folding method, "simultaneously" here means that at least a period of time is simultaneous, but the start time and end time of the two turning movements are not necessarily the same. In the illustrated embodiment, the rear wheel frame 22 first starts to rotate and unfold relative to the cushion assembly 80, as shown in FIG. 21C , and then, the seat cushion assembly 80 starts to rotate and fold relative to the front wheel frame 12, as shown in FIG. 21D . In the state shown in FIG. 21E , the rear wheel assembly 20 is rotated relative to the seat cushion assembly 80 to the rear wheel unfolded position P201 , and the seat cushion assembly 80 is rotated and folded relative to the front wheel frame 12 of the front wheel assembly 10 to a predetermined angle.

From the state shown in Figure 21E, the seat cushion assembly 80 and the front wheel frame 12 of the front wheel assembly 10 start to rotate and unfold, and then go through Figure 21F, Figure 21G and Figure 21H to reach the state of Figure 21I. Roughly, it can be understood that the front legs of the folding wheelchair 800 start to climb up. From the state shown in FIG. 21E via the state shown in FIG. 21F to the state shown in FIG. 21G , the pedal arm 52 of the pedal assembly 50 is naturally rotated and retracted relative to the front wheel frame 12, and the rolling wheel 54 of the pedal assembly 50 is in the Rolling on the supporting surface G0, the pedal 53 also rides on the supporting surface G0. From the state shown in FIG. 21G to the state shown in FIG. 21H, as the angle between the seat cushion assembly 80 and the front wheel frame 12 of the front wheel assembly 10 expands to a predetermined value, the pedal assembly 50 as a whole breaks away from the supporting surface G0, as shown in FIG. 21H. Then continue to rotate between the cushion assembly 80 and the front wheel frame 12 of the front wheel assembly 10 until the state of FIG. 21I.

For the unfolding process of other parts of the folding wheelchair 800 such as the backrest assembly 30, the hand-holding assembly 40, and the manipulation assembly 90, reference can be made to the reverse process of the aforementioned folding process, which will not be repeated here.

The above-mentioned folding wheelchair 800 can be equipped with an inertial measurement unit, such as including an angle sensor, a gyroscope + an accelerometer, etc., so that the folding wheelchair 800 can only be operated in a safe state, and the starting position of unfolding can only be vertical (as shown in Fig. 20) or horizontally (that is, the aforementioned situation where the end 804 of the folding wheelchair 800 in the folded state C23 faces the front side and the lower side 806 is supported on the supporting surface G0), the starting position of folding can only be is horizontal (as shown in Figure 19K).

On the whole, for the folding wheelchair shown in the figure, the user can first fold the control component, then unlock and fold the hand-held component, then get up and fold the cushion of the backrest component, and then send an instruction for the folding wheelchair to perform automatic folding action, first , the front wheel assembly including the pedal assembly performs a folding action, and the folding action of the front wheel assembly is stopped when the pedals in the pedal assembly are deployed, and then the left and right rear wheel assemblies start to carry out under the drive of the second drive unit Folding action, at the same time, the front wheel assembly is unfolded again, and the left and right rear wheel assemblies are folded to avoid position. Before the left and right rear wheel assemblies are completely folded, the unlocking assembly of the support assembly will be triggered. 1. When the right rear wheel assembly is fully folded, the backrest assembly will also be automatically folded. At this time, the front wheel assembly can be in a fully unfolded position, so it can be folded again. After the front wheel assembly is in place, the folding operation of the whole machine is completed. At this time, if it is necessary to move, the backrest assembly of the folding wheelchair can be pulled to the state shown in Figure 18 for use.

When unfolding, as mentioned above, the folding wheelchair can be placed in two positions to start the automatic unfolding action. The first is to place the whole machine vertically, and the second is to place the whole machine horizontally. It can be simply converted to the state of FIG. 21B by unfolding the front wheel assembly. Then the left and right rear wheel assemblies are rotated out respectively under the driving action of the second drive unit. The front wheel assembly is unfolded again. At this time, since the position of the center of gravity has been transferred from the right side of the front roller to the left side of the front roller, so along with the expansion of the front wheel assembly, the entire folding wheelchair can also be completed from the vertical state (as shown in Figure 20). ) to the horizontal state (as shown in Figure 21I). After the driving device is driven, the front wheel assembly and the rear wheel assembly participating in the deployment of the whole machine can be locked by the screw rod in the driving device, so as to ensure the stability of the structure. Then, the user can open the backrest assembly, which will be automatically locked when the backrest assembly moves to the unfolded position of the backrest, and then the folded back cushion can be turned up. After sitting on the cushion assembly, the user can put down the armrests on both sides, and the armrests can also be locked after being put down. Finally, the user can open the folded control assembly to operate the folding wheelchair.

The above-mentioned folding wheelchair can automatically fold or open the wheelchair and transform the posture of the wheelchair through the transfer of the center of gravity, without the user's participation. The rear wheel assembly can be folded and stored under the seat cushion by simple rotation, and the front wheel assembly can also be stored under the seat cushion when folded. Among them, the angle between the front wheel assembly and the ground can be changed to achieve the purpose of changing the angle between the seat cushion and the ground, so that the function of the foot pedal touching the ground to form a slope and easy entry and exit of the folding wheelchair can be developed.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention, all fall within the scope of protection defined by the claims of the present invention.

Claims

A folding wheelchair, comprising a cushion assembly, a front wheel assembly and a rear wheel assembly, the upper ends of the front wheel assembly and the rear wheel assembly are respectively rotatably connected to the front connection position and the rear connection position of the seat cushion assembly, which characterized in that,

The folding wheelchair also includes a first drive assembly, and the first drive assembly includes:

The first movable part is arranged on the cushion assembly in a forward and backward manner;

a first connecting arm, the two ends of which are respectively hinged to the first movable member and the first of the front wheel assembly and the rear wheel assembly; and

The first driving unit is used to drive the first movable part to move back and forth, whereby the first party can be rotatably unfolded or folded relative to the cushion assembly under the driving action of the first connecting arm.
The folding wheelchair according to claim 1, characterized in that,

There is a front rotation axis and a rear rotation axis between the upper ends of the front wheel assembly and the rear wheel assembly and the cushion assembly;

The front rotation axis and the rear rotation axis are parallel straight lines, whereby the second side of the front wheel assembly and the rear wheel assembly avoids the first side when folded relative to the cushion assembly. .
The folding wheelchair according to claim 2, characterized in that,

The front rotation axis extends along the side of the cushion assembly, and the rear rotation axis extends obliquely upward toward the side.
The folding wheelchair according to claim 2, characterized in that,

said first party is said front wheel assembly;

The rear wheel assembly is arranged such that the rear wheel assembly rotates between the rear wheel unfolded position and the rear wheel folded position relative to the seat cushion assembly, and in the rear wheel unfolded position, the rear rollers of the rear wheel assembly The rolling axis extends along the side of the cushion assembly, and at the folded position of the rear wheels, the rolling axis of the rear roller extends along the thickness direction of the cushion assembly.
The folding wheelchair according to claim 1, characterized in that,

The folding wheelchair also includes a second drive assembly, and the second drive assembly includes:

The second movable part is movable back and forth on the cushion assembly;

a second connecting arm, the two ends of which are respectively hinged to the second movable member and the second side of the front wheel assembly and the rear wheel assembly; and

The second driving unit drives the second movable member to move back and forth, whereby the second party can be folded or unfolded relative to the cushion assembly under the driving action of the second connecting arm.
The folding wheelchair according to claim 5, characterized in that,

The cushion assembly includes a lower guide rod and an upper guide rod, the lower guide rod and the upper guide rod both extend forward and backward and are arranged at the middle position of the cushion in the left and right direction of the cushion assembly;

The first movable part is movably arranged on the lower guide rod back and forth, and the second movable part is arranged on the upper guide rod movably back and forth.
The folding wheelchair according to claim 5, wherein the folding wheelchair further comprises:

a position detection unit, configured to detect the movement position of the first movable part and/or the second movable part;

A controller transmits a control signal to the first drive unit and/or the second drive unit based on the movement position detected by the position detection unit.
The folding wheelchair according to claim 1, wherein the first party is the front wheel assembly, the front wheel assembly includes a front wheel frame supporting the front rollers, and the front wheel assembly passes through the front wheel The upper end of the frame is rotatably connected to the cushion assembly;

The front wheel assembly also includes a pedal assembly, and the pedal assembly includes:

Pedal assembly, including:

a pedal arm, the upper end of which is rotatably arranged on the front wheel frame;

a pedal connected to the lower end of the pedal arm; and

The rolling wheels are arranged on the footrest assembly and are configured to roll and contact the ground when the front wheel frame is turned and folded relative to the seat cushion assembly.
The folding wheelchair according to claim 8, characterized in that,

The pedal arm is provided with a mounting hole whose cross section has an elongation direction;

The foot pedal has a connection portion and is rotatably connected to the pedal arm through the connection portion, whereby the foot pedal is rotatable relative to the pedal arm to a first pedal for a user to step on an unfolded position, wherein the connecting portion has an unfolded fitting portion;

The pedal assembly also includes a limiting device, and the limiting device includes:

a limit rod movably penetrating through the installation hole of the pedal arm along the elongation direction; and

The limiting elastic member, the elastic force of the limiting elastic member has a tendency to make the limiting rod move along the elongation direction to abut against the side wall of the installation hole, whereby the limiting rod Cooperating with the deployment fitting portion of the connecting portion, the pedal is maintained in the first pedal deployment position relative to the pedal arm.
The folding wheelchair according to claim 9, characterized in that,

The front wheel frame includes a force application part;

The pedal arm is arranged to be rotatable and folded relative to the front wheel frame to the stowed position of the pedals, and at the stowed position of the pedals, the force applying part exerts force to the limit rod, so that the limit rod Overcoming the elastic force of the position-limiting elastic member, the deployment matching portion of the connecting portion is disengaged, whereby the pedal is rotatable relative to the pedal arm.
The folding wheelchair according to claim 9, characterized in that,

The pedal arm is arranged to be rotatable relative to the front wheel frame and folded to the stowed position of the pedal, and the first connecting arm is arranged to be rotatable to the connecting arm unfolded position relative to the upper part of the front wheel frame, and the pedal The arm and the first connecting arm are respectively provided with a buckling part and a buckling part. When the first connecting arm is located at the position where the connecting arm is deployed and the pedal arm is located at the position where the pedal is folded, the The fastening portion of the first connecting arm is fastened with the fastening portion of the pedal arm.
The folding wheelchair according to claim 9, characterized in that,

The pedal is configured to be rotatable relative to the pedal arm to the retracted position of the pedal, and the limiting device further includes a limiting member connected to the limiting rod and rotatably disposed on the In the pedal arm, the connecting portion further has a retractable fitting portion, and when the pedal is located at the pedal retracted position, the limiting member cooperates with the retractable fitting portion of the connecting portion, The pedal is kept at the retracted position of the pedal.
The folding wheelchair according to claim 1, further comprising:

a backrest assembly rotatably mounted to the cushion assembly; and

Backrest locking assembly, including:

a locking support mounted to the cushion assembly and provided with a locking groove;

The matching component is installed to the backrest component and is provided with a lock shaft, and the backrest component is locked in the backrest deployment position relative to the seat cushion component by snapping the lock shaft into the lock groove; and

Back against the locking elastic part, the elastic force of the back against the locking elastic part has a tendency to keep the lock shaft locked into the lock slot.
The folding wheelchair according to claim 13, further comprising:

Unlock components, including:

a trigger lever rotatably mounted to the cushion assembly; and

The unlocking part is movably supported on the locking support, and is configured to be pushed by one end of the trigger lever as the trigger lever rotates, thereby pushing the lock shaft out of the lock slot, thereby, The backrest assembly is unlocked from the backrest deployed position.
The folding wheelchair according to claim 14, characterized in that,

The first party is the front wheel assembly, the rear wheel assembly includes a rear wheel frame supporting the rear roller, and the rear wheel assembly is rotatably connected to the cushion assembly through the upper end of the rear wheel frame;

The folding wheelchair is configured such that when the rear wheel frame is rotated and folded from the rear wheel unfolded position to the rear wheel folded position relative to the seat cushion assembly, the rear wheel frame pushes the trigger lever so that the The trigger lever rotates, and then the trigger lever pushes the lock shaft out of the lock groove.
The folding wheelchair according to claim 13, characterized in that,

The matching component includes a locking bracket, the locking bracket is rotatably mounted on the backrest component, and the locking shaft is arranged at one end of the locking bracket.
The folding wheelchair according to claim 1, further comprising:

Back against the assembly, with vertically extending mounting sections on the sides;

The hand-held assembly includes a folding assembly, the folding assembly includes an armrest, a first bar and a second bar, the armrest has a bar section, the bar section, the first bar, the second bar and the mounting Sections form a hinged four-bar mechanism, wherein the rod section and the mounting section constitute the connecting rod and the frame of the hinged four-bar mechanism respectively, and the first rod and the second rod constitute the hinged four-bar mechanism respectively. Link rods on the upper and lower sides of the rod mechanism;

Wherein, the hinged four-bar mechanism is configured to be switchable from the four-bar unfolded state to the four-bar folded state. In the four-bar unfolded state, the angle between the first bar and the bar section is α1 and the jaw faces toward Next, in the four-bar folded state, the included angle between the first bar and the bar segment is α2 and the jaw faces upward, wherein α1 is 170-180°, and α2 is 0-10°.
The folding wheelchair according to claim 1, further comprising:

Handheld components, including armrests; and

The control component is used to control the forward direction of the wheelchair, including:

a control seat provided with a joystick for manual control; and

The control bracket is arranged at the front end of the armrest, and the control seat is foldably supported on the control bracket so as to be switchable between the control opened state and the control folded state. state, the control seat is opened to the front side of the control bracket, the control rod is exposed on the upper side of the control seat, and in the control folded state, the control seat is folded to the control bracket above, the control lever is located at the lower side of the control seat.
The folding wheelchair according to claim 1, further comprising a backrest assembly,

The backrest assembly includes:

The backrest has vertically extending mounting sections at the sides;

Cushions, providing a backrest;

The upper and lower push rods, the back cushion, the two push rods and the backrest frame form a hinge four-bar mechanism, wherein the back cushion and the backrest frame constitute the hinge four-bar mechanism respectively. The connecting rod and the frame, the two push rods constitute the two connecting rods of the hinge four-bar mechanism, and the back cushion is arranged to be switchable from the back cushion push-out position to the back cushion via the middle position of the back cushion relative to the back rest frame a stowed position, the cushion being closer to the front side in the cushion push-out position than in the cushion stowed position; and

Back against the elastic member, one end is connected to one of the two push rods, and the other end is connected to the back cushion, the elastic force of the back against the elastic member makes the back cushion have a transition from the middle position of the back cushion to the back cushion. The tendency of the pushed-out position of the cushion or the stowed position of said cushion.
A folding method of a folding wheelchair, the folding wheelchair includes a cushion assembly, a front wheel assembly and a rear wheel assembly, characterized in that,

The folding method includes:

From the front and rear wheel deployment state C11, in the state where the front roller of the front wheel assembly and the rear roller of the rear wheel assembly are supported on the supporting surface, the first of the front wheel assembly and the rear wheel assembly turn and fold the seat cushion assembly around the first rotation axis until the first intermediate state C17 where the first side is horizontally supported on the supporting surface, wherein the first rotation axis is set on the first square and the joint of the cushion assembly;

From the first intermediate state C17, in the state where the first side is horizontally supported on the supporting surface, the cushion assembly rotates and unfolds relative to the first side around the first rotation axis, and at the same time , the second side of the front wheel assembly and the rear wheel assembly is rotated and folded relative to the seat cushion assembly around the second rotation axis until the end of the seat cushion assembly close to the position of the first rotation axis Supported on the supporting surface until the first folded state C20, wherein the second rotation axis is set at the connection between the second side and the cushion assembly;

From the first folded state C20, in the state where the end portion of the cushion assembly is supported on the supporting surface, the first party is rotated and folded toward the cushion assembly around the first rotation axis to the second folded state C23.
The folding method according to claim 20, characterized in that,

The first party is the front wheel assembly.
The folding method according to claim 20, characterized in that,

The folding wheelchair also includes:

The first driving assembly includes a first movable part and a first connecting arm, the first movable part is arranged on the cushion assembly in a forward and backward manner, and the two ends of the first connecting arm are respectively hinged to the first movable part and the first party, by making the first drive unit drive the first movable part to move back and forth, so that the first party is rotated relative to the cushion assembly under the action of the first connecting arm or fold; and/or

The second drive assembly includes a second movable part and a second connecting arm, the second movable part is arranged on the cushion assembly in a forward and backward manner, and the two ends of the second connecting arm are respectively hinged to the second movable part and the second part, by making the second driving unit drive the second movable part to move back and forth, so that the second part is rotated and unfolded relative to the cushion assembly under the action of the second connecting arm or fold.
The folding method according to claim 22, characterized in that,

By detecting the movement position of the first movable part and/or the second movable part, the unfolded and folded state of the first side and/or the second side relative to the cushion assembly is determined.
The folding method according to claim 20, characterized in that,

When the second party is turned and folded relative to the cushion assembly, the second party avoids the first party; and/or

When the second side is turned and folded relative to the cushion assembly, the rolling axis of the roller of the second side changes from extending along the side of the cushion assembly to extending along the thickness direction of the cushion assembly.
The folding method according to claim 20, characterized in that,

The first party is the front wheel assembly, the front wheel assembly includes a front wheel frame supporting the front rollers, and the front wheel assembly is rotatably connected to the cushion assembly through the upper end of the front wheel frame;

The front wheel assembly also includes a pedal assembly, and the pedal assembly includes:

Pedal assembly, including:

a pedal arm, the upper end of which is rotatably arranged on the front wheel frame;

a pedal connected to the lower end of the pedal arm; and

a scroll wheel, arranged on the pedal assembly;

The folding wheelchair reaches the first intermediate state C17 from the unfolded state C11 of the front and rear wheels via the second intermediate state C15 in which the rolling wheels contact the supporting surface, and from the second intermediate state C15 to the first intermediate state C17. During an intermediate state C17, the rolling wheel rolls on the supporting surface, driving the pedal arm to rotate and unfold relative to the front wheel frame.
The folding method according to claim 25, characterized in that,

so that the pedal can be rotated relative to the pedal arm to a first pedal deployment position and a second pedal deployment position, wherein the angle between the pedal and the pedal arm is within the range of the first pedal The expanded position and the second pedal expanded position are respectively a first predetermined value V1 and a second predetermined value V2, and the second predetermined value V2 is greater than the first predetermined value V1;

The folding wheelchair reaches the first intermediate state C17 from the second intermediate state C15 via the third intermediate state C16, and in the process from the second intermediate state to the third intermediate state C16, the footrests are opposite to each other. When the pedal arm is kept at the first pedal extended position, during the process from the third intermediate state C16 to the first intermediate state C17, the pedal relative to the pedal arm moves from the The first pedal deployment position is rotated to the second pedal deployment position, wherein the second predetermined value V2 is 175-185°.
The folding method according to claim 26, characterized in that,

In the process from the second intermediate state to the third intermediate state C16, the pedal is kept at the first pedal extended position relative to the pedal arm by a limiting device, and the The pedal arm rotates relative to the front wheel frame to the stowed position of the pedals, so that at the stowed position of the pedals, the front wheel frame releases the limiting effect of the limiting device, whereby the pedals The first intermediate state C17 is reached from the third intermediate state C16 by rotating relative to the pedal arm from the first pedal deployment position to the second pedal deployment position under the force of gravity.
The folding method according to claim 25, characterized in that,

In said second folded state C23, said pedal arm remains in a stowed pedal position relative to said front wheel frame; and/or

In the second folded state C23, the pedal is maintained in a pedal stowed position relative to the pedal arm.
The folding method according to claim 20, characterized in that,

The second party is the rear wheel assembly, the rear wheel assembly includes a rear wheel frame supporting the rear rollers, and the rear wheel assembly is rotatably connected to the cushion assembly through the upper end of the rear wheel frame;

The folding wheelchair also includes:

a backrest component, foldably installed on the cushion component;

a backrest locking assembly for locking the backrest assembly in a backrest deployed position relative to the seat cushion assembly; and

an unlocking component, configured to unlock the backrest component from the unfolded position of the backrest;

In the process from the first intermediate state C17 to the first folded state C20, the unlocking assembly is triggered to release the backrest assembly from the backrest assembly during the process of folding the rear wheel frame relative to the seat cushion assembly. It is unlocked by the unfolded position, so that the backrest assembly is folded relative to the seat cushion assembly under the action of gravity.
The folding method according to claim 29, characterized in that,

The backrest assembly has a vertically extending installation section on the side;

The folding wheelchair also includes armrests;

Before the backrest assembly is folded relative to the seat cushion assembly under the action of gravity, the armrest is folded relative to the installation section, and in the folded state of the armrest, the fourth clip between the armrest and the installation section The angle is -10-20°.
The folding method according to claim 30, characterized in that,

The folding wheelchair also includes a control component for controlling the forward direction of the folding wheelchair;

The control components include:

a control seat provided with a joystick for manual control; and

A control bracket is arranged at the front end of the armrest, and the control seat is foldably supported on the control bracket;

Before the armrest is folded relative to the installation section, the control bracket is switched from the control open state to the control fold state, and in the control open state, the control seat is opened to the control bracket On the front side, the control lever is exposed on the upper side of the control seat. In the control retracted state, the control seat is folded above the control bracket, and the control lever is located under the control seat. side.
The folding method according to claim 29, characterized in that,

The backrest assembly includes a backrest frame and a cushion providing a backrest surface, and the backrest assembly is foldably installed on the cushion assembly through the backrest frame;

Before the backrest assembly is folded relative to the seat cushion assembly, pushing the cushion relative to the backrest frame from a cushion push-out position to a cushion stowed position, wherein the cushion is in the cushion push-out position compared to The folded position of the back cushion is closer to the front side.