A novel folding mechanism and a foldable wheelchair provided with the folding mechanism

Abstract

The object of the present invention is to provide a novel folding mechanism and a wheelchair capable of being quickly folded, so as to increase the convenience of using the wheelchair and enhance the market competitiveness of the product. A novel folding mechanism includes a first folding mechanism and a second folding mechanism. The first folding mechanism and the second folding mechanism are in series four-bar link structures, and the first folding mechanism and the second folding mechanism can move simultaneously. The present invention also provides a foldable wheelchair, which includes a movable chassis, a seat, a backrest and the novel folding mechanism of the present invention. The first folding mechanism is installed between the movable chassis and the seat, and the second folding mechanism is connected between the seat and the backrest.

Description

Technical Field

[0001] The present invention relates to the technical fields of folding mechanisms and wheelchairs, and particularly to a novel folding mechanism and a foldable wheelchair provided with the folding mechanism. Background Art

[0002] A wheelchair is a chair equipped with wheels that can help replace walking, and is divided into electric and manual wheelchairs. It is an important moving tool for the wounded, sick, and disabled for home rehabilitation, turnover transportation, medical treatment, and outdoor activities. The wheelchair not only meets the transportation needs of the physically disabled and those with mobility difficulties, but more importantly, it facilitates the movement and care of the sick by their families, enabling the sick to exercise their bodies and participate in social activities with the help of the wheelchair.

[0003] Wheelchairs have long been a means of transportation for people with lower limb motor disabilities. In order to be more convenient to use, more and more technological improvements have emerged in wheelchairs. For example, in order to facilitate the user to carry, more and more foldable wheelchairs have appeared. However, most of the foldable wheelchairs on the market are manual folding wheelchairs, and the folding process is divided into several steps, which is not convenient to use. Therefore, it is necessary to invent a wheelchair that can be folded conveniently and quickly. Summary of the Invention

[0004] The object of the present invention is to provide a novel folding mechanism and a wheelchair that can be quickly folded, increase the convenience of using the wheelchair, and increase the market competitiveness of the product. A novel folding mechanism includes a first folding mechanism and a second folding mechanism. The first folding mechanism and the second folding mechanism are in series four-bar link structures, and the first folding mechanism and the second folding mechanism can move simultaneously.

[0005] Preferably, the first folding mechanism is a four-bar link structure, including a first support rod, a second support rod, a first folding member, and a fixing member. One end of the first support rod and the second support rod are respectively hinged to the fixing member, and the other end of the first support rod and the second support rod are respectively hinged to the first folding member;

[0006] One end of the second support rod hinged to the first folding member further has a second extension end. The second folding mechanism includes the second extension end, a fourth support rod, a fifth support rod, and a second folding member. The second extension end is hinged to the fourth support rod, the fourth support rod is hinged to the second folding member, the second folding member is hinged to one end of the fifth support rod, and the other end of the fifth support rod is fixedly connected to the first folding member.

[0007] This technical solution provides a novel folding mechanism, which increases the diversity in product design.

[0008] Preferably, the second folding member includes a sixth support rod and a sixth extension end. The sixth support rod is hinged to the fourth support rod and the fifth support rod respectively. The length of the fourth support rod is greater than the lengths of the second extension end and the sixth support rod. One end of the sixth support rod hinged to the fifth support rod has a sixth extension end, and the sixth extension end is the structure that needs to be folded of the second folding member.

[0009] This technical solution realizes the folding and unfolding of the second folding member following the first folding member.

[0010] Preferably, the first folding member includes a third support rod and a third extension end. Both ends of the third support rod are hinged to the first support rod and the second support rod respectively. One end of the third support rod hinged to the first support rod also has a third extension end, and the third extension end is the structure that needs to be folded of the first folding member.

[0011] The present invention also provides a foldable wheelchair, which includes a movable chassis, a seat, a backrest and the novel folding mechanism of the present invention. The first folding mechanism is installed between the movable chassis and the seat, the second folding mechanism is connected between the seat and the backrest. The first folding member includes the seat, and the second folding member includes the backrest.

[0012] Preferably, the first folding mechanism includes an A connecting seat, a B connecting seat, a first support rod and a second support rod. The A connecting seat is fixedly installed on the movable chassis, the B connecting seat is fixedly installed under the seat, and the first support rod and the second support rod are hinged between the A connecting seat and the B connecting seat; the first folding member includes the B connecting seat and the seat.

[0013] Preferably, it further includes a hinge rod. The B connecting seat is provided with a hinge hole, and the hinge rod can extend into the hinge hole or disengage from the hinge hole; both the second extension end and the fourth support rod are hinged to the hinge rod.

[0014] Preferably, the second folding mechanism includes a second extension end, a fourth support rod, a fifth support rod and a sixth support rod. One end of the sixth support rod is hinged to the fourth support rod, the other end of the sixth support rod is fixedly connected to the backrest, one end of the fifth support rod is hinged to the backrest, and the other end of the fifth support rod is fixedly connected to the seat.

[0015] This technical solution realizes the primary folding function of a foldable wheelchair of the present invention.

[0016] Preferably, it further includes a first extension end, a first connecting rod, a second connecting rod, and a footrest. The footrest is hinged to the movable chassis. One end of the first support rod hinged to the A connecting seat is provided with a first extension end, the first extension end is hinged to the first connecting rod, the first connecting rod is hinged to the second connecting rod, and the second connecting rod is hinged to the footrest.

[0017] This technical solution also adds the function that the footrest folds and unfolds following the folding and opening of the seat and the backrest, making the functions of the foldable wheelchair of the present invention more diverse.

[0018] Preferably, it further includes a limiting member. The second connecting rod and the footrest are unidirectionally limited by the limiting member. The footrest can be driven by the movement of the second connecting rod to fold or unfold, or can be folded or unfolded manually.

[0019] In this technical solution, the footrest can be folded separately, so that it can avoid blocking the user during the process of transferring to the wheelchair.

[0020] A new folding mechanism provided by the present invention and a foldable wheelchair provided with the folding mechanism can bring at least one of the following beneficial effects:

[0021] 1. Provide a new mechanical design structure form for product design;

[0022] 2. The foldable wheelchair of the present invention has the function of being completely retractable with only one fold, and the operation is convenient and simple;

[0023] 3. The novel foldable wheelchair structure of the present invention is simple, exquisitely designed, small and compact, and the shape is very novel and generous;

[0024] 4. The novel foldable wheelchair of the present invention has a low production and manufacturing cost and is easy to mass-produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above characteristics, technical features, advantages and their implementation manners of a kind of adjustable assisted standing device of the present invention will be further described below in a clear and understandable manner in conjunction with the drawings in the preferred embodiments.

[0026] Figure 1 It is a schematic diagram of the principle of a new folding mechanism of the present invention.

[0027] Figure 2 It is a folding schematic diagram of a new folding mechanism of the present invention.

[0028] Figure 3 It is a structural schematic diagram of a foldable chair frame of a foldable wheelchair of the present invention.

[0029] Figure 4It is a schematic structural diagram of a foldable chair frame of a foldable wheelchair according to the present invention.

[0030] Figure 5 It is a side schematic view of the foldable chair frame of a foldable wheelchair according to the present invention when it is opened.

[0031] Figure 6 It is a side schematic view of the folding process of the foldable chair frame of a foldable wheelchair according to the present invention.

[0032] Figure 7 It is a side schematic view of the foldable chair frame of a foldable wheelchair according to the present invention when it is completely folded.

[0033] Explanation of the reference numerals in the drawings:

[0034] 100. New type of foldable wheelchair; 20. Seat (first folding member); 30. Backrest (second folding member);

[0035] 40. First folding mechanism; 50. Second folding mechanism; 60. Movable chassis;

[0036] 11. A connecting seat; 12. B connecting seat; 13. A hinge hole; 14. B hinge hole; 15. C hinge hole;

[0037] 16. D hinge hole; 17. E hinge hole; 31. Hinge point; 41. First support rod; 42. Second support rod;

[0038] 43. Third support rod; 44. Third extension end; 51. Fourth support rod; 53. Sixth support rod;

[0039] 54. Fifth support rod; 55. Second extension end; 56. Sixth extension end; 52. Hinge rod;

[0040] 61. Footrest; 62. Link rod; 63. Hinge hole; 64. Cross bar; 65. Limiting member;

[0041] 66. Second link rod; 67. First link rod; 68. Second extension end. Specific embodiments

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0043] For the sake of simplicity of the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product as a whole. Additionally, for the sake of simplicity and easy understanding of the drawings, in some figures, only one of the components with the same structure or function is schematically shown, or only one of them is labeled. In this article, "one" not only means "only this one", but also can mean "more than one" situation.

[0044] In this article, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In this article, up, down, left, right, front, and back refer to up, down, left, right, front, and back of the described drawings, and do not completely represent the actual situation.

[0045] A novel folding mechanism. In the first specific embodiment, as Figure 1-2 shown, the schematic diagram of the folding mechanism is drawn using a simplified drawing method.

[0046] In this embodiment, as Figure 1 - Figure 2 shown, a novel folding mechanism of the present invention adopts two series-connected four-bar linkages. Through the upward and downward swinging of the first folding mechanism 40, the folding and opening of the first folding member 20 are realized, and at the same time, the second folding mechanism 50 is linked to drive the folding and opening of the second folding member 30.

[0047] As Figure 1-2 shown, the first folding mechanism 40 is a four-bar structure, including a first support rod 41, a second support rod 42, a first folding member 20, and a fixing member. One end of the first support rod 41 and the second support rod 42 are respectively hinged to the fixing member, and the other ends of the first support rod 41 and the second support rod 42 are respectively hinged to the first folding member 20;

[0048] One end of the second support rod 42 that is hinged to the first folding member 20 further has a second extension end 55. The second folding mechanism 50 includes the second extension end 55, a fourth support rod 51, a fifth support rod 54, and a second folding member 30. The second extension end 55 is hinged to the fourth support rod 51, the fourth support rod 51 is hinged to the second folding member 30, one end of the second folding member 30 is hinged to the fifth support rod 54, and the other end of the fifth support rod 54 is fixedly connected to the first folding member 30.

[0049] The second folding member 30 includes a sixth support rod 53 and a sixth extension end 56. The sixth support rod 53 is respectively hinged to the fourth support rod 51 and the fifth support rod 54. The length of the fourth support rod 51 is greater than the lengths of the second extension end 55 and the sixth support rod 53. One end of the sixth support rod 53 hinged to the fifth support rod 54 has a sixth extension end 56, and the sixth extension end 56 is the structure of the second folding member 30 to be folded.

[0050] The first folding member 20 includes a third support rod 43 and a third extension end 44. Both ends of the third support rod 43 are respectively hinged to the first support rod 41 and the second support rod 42. One end of the third support rod 43 hinged to the first support rod 41 further has a third extension end 44, and the third extension end 44 is the structure of the first folding member 20 to be folded.

[0051] As Figure 1-2 shown, in this embodiment, the third support rod 43, the third extension end 44, and the fifth support rod 54 can be regarded as being on one structural member. By connecting the first folding mechanism 40 and the second folding mechanism 50 in series through the second extension end 55 and the fifth support rod 54, it is possible to fold or open the second folding member 30 while folding or opening the first folding member 20. The third extension end 44 is the structure that the first folding member 20 needs to fold, and the sixth extension end 56 is the structure that the second folding member 30 needs to fold.

[0052] Preferably, in order to make the first folding member 20 horizontal, the first folding mechanism 40 can be tilted, and the connection mode of the first support rod 41 to the fixing member can be changed so that the first support rod 41 is not directly hinged to the fixing member. First, the first support rod 41 is hinged to a connecting member, and then the connecting member is fixedly connected to the fixing member.

[0053] Preferably, both the sixth extension end 56 and the third extension end 44 can be designed as any other structures to be folded.

[0054] The present invention also provides a foldable wheelchair 100 that utilizes a novel folding mechanism in the first specific embodiment of the present invention. A foldable wheelchair 100 includes a movable chassis 60 (wheels are not shown in the specification drawings), a seat 20, a backrest 30, a first folding mechanism 40, and a second folding mechanism 50. The first folding mechanism 40 is connected between the movable chassis 60 and the seat 20, and the second folding mechanism 50 is connected between the seat 20 and the backrest 30. Therefore, the first folding mechanism 40 constitutes the main bracket of the foldable wheelchair 100 of the present invention, and the structure of the movable chassis 60 is not specified in the present invention.

[0055] The first folding mechanism 40 can fold and open the seat 20, and the second folding mechanism 50 can fold and open the backrest 30. The first folding mechanism 40 and the second folding mechanism 50 are in series to simultaneously fold or open the seat 20 and the backrest 30.

[0056] Preferably, the number of the first folding mechanisms 20 is at least one, and / or the number of the second folding mechanisms 40 is at least one.

[0057] The movement of the first folding mechanism 40 is driven by a telescopic rod member or manually by the user. This telescopic rod member can be a mature push rod motor on the market or other electric telescopic rod members or hydraulic telescopic rod members or pneumatic telescopic rod members or gas-liquid mixed telescopic rod members. The present invention does not specify the specific installation position of the telescopic rod member, as long as it can drive the movement of the first folding mechanism 40.

[0058] The movement of the second folding mechanism 50 can be driven manually or by a telescopic rod member. This telescopic rod member can be a mature push rod motor on the market or other electric telescopic rod members or hydraulic telescopic rod members or pneumatic telescopic rod members or gas-liquid mixed telescopic rod members. The present invention does not specify the specific installation position of the telescopic rod member for driving the second folding mechanism 50, as long as it can drive the movement of the second folding mechanism 50.

[0059] In the second specific embodiment, as Figure 3 - Figure 7 shown, there are two A connection seats 11 on the movable chassis 60, which are respectively installed on the left and right sides of the movable chassis 60; there are two B connection seats 12 at the lower part of the seat 20, which are respectively installed on the left and right sides of the wheelchair.

[0060] Preferably, the A connection seat 11 can be directly fixedly installed on the movable chassis 60, or can be detachably fixedly connected to the movable chassis 60 through a connecting device. The B connection seat 12 can be directly fixedly installed at the lower part of the seat 20, or can be detachably fixedly connected to the lower part of the seat 20 through a connecting device.

[0061] In this embodiment, the main body bracket of the foldable wheelchair 100 includes two first folding mechanisms 40, which are respectively installed on the left and right sides of the wheelchair; each of the first folding mechanisms 40 is composed of one first support rod 41, one second support rod 42, one A connection seat 11 and one B connection seat 12.

[0062] One end of the first support rod 41 is hinged to the A connection seat 11 through the A hinge hole 13, and the other end is hinged to the B connection seat 12 through the B hinge hole 14. One end of the second support rod 42 is hinged to the A connection seat 11 through the C hinge hole 15, and the other end is hinged to the B connection seat 12 through the D hinge hole 16.

[0063] Therefore, in this embodiment, the number of the first support rod 41 and the second support rod 42 is also two, which are distributed on the left and right sides of the wheelchair.

[0064] Particularly, in the first specific embodiment, the third support rod 43 is replaced by the B connecting seat 12 in the second specific embodiment.

[0065] In this embodiment, as shown in the figure, in the A connecting seat 11, the position of the A hinge hole 13 is higher than that of the C hinge hole 15, and in the B connecting seat 12, the position of the B hinge hole 14 is higher than that of the D hinge hole 16. Then, the first support rod 41 and the second support rod 42 are arranged obliquely in the vertical direction. Thus, the seat 20 is in a horizontal position. The first folding member includes the seat 20 and the B connecting seat connected to the seat 20.

[0066] In this embodiment, an articulated rod 52 is further included. E hinge holes 17 are further provided on the two B connecting seats 12. One end of the second support rod 42 hinged to the D hinge hole 16 further has a second extension end 55, and the second extension end 55 is hinged to the articulated rod 52.

[0067] The second folding mechanism 50 includes two second extension ends 55, two fourth support rods 51, two sixth support rods 53, and two fifth support rods 54. The fourth support rods 51 are hinged to the articulated rod 52. The two fourth support rods 51 are distributed at both ends of the articulated rod 52. One end of each of the two sixth support rods 53 is hinged to the fourth support rod 51, and the other end is fixedly connected to the backrest 30. One end of the fifth support rod 54 (shown as a bent pipe between the seat 20 and the backrest 30 in the figure) is fixedly connected to the seat 20, and one end is hinged to the backrest 30 through a hinge point 31. The backrest 30 is also a sixth extension end 56.

[0068] The second extension end 55, the fourth support rod 51, the sixth support rod 53, and the fifth support rod 54 form a four-bar linkage mechanism, and the length of the fourth support rod 51 is greater than the lengths of the second extension end 55 and the sixth support rod 53.

[0069] Therefore, in this embodiment, the first folding mechanism 40 and the second folding mechanism 50 are connected in series through the second extension end 55 and the fifth support rod 54, and the seat 20 and the backrest 30 can be folded and opened simultaneously.

[0070] Both ends of the articulated rod 52 have a telescopic function. When the seat 20 and the backrest 30 of the foldable wheelchair 100 of the present invention are opened, both ends of the articulated rod 52 extend into the two E hinge holes 17 respectively, and then the first folding structure 40 is fixed as the main body bracket, and the seat 20 and the backrest 30 are in an open form.

[0071] When the foldable wheelchair 100 of the present invention is folded, the two ends of the hinge rod 52 first contract and disengage from the E hinge hole 17. The two ends of the hinge rod 52 are compressed between the two B connectors 12 and slide between the two B connectors 12. At this time, the first support rod 41 and the second support rod 42 are driven to swing downward, and then the seat 20 is folded. While the second support rod 42 swings downward, the second extension end 55 swings upward, driving the hinge rod 52 to swing upward. The fourth support rod 51 is used to push the sixth support rod 53 to swing forward, thereby driving the backrest 30 to rotate forward around the hinge point 31 to fold the backrest 30.

[0072] Conversely, when the foldable wheelchair 100 of the present invention is to be opened again, the first folding mechanism 40 can be directly driven to swing upward. The hinge rod 52 slides between the two B connectors 12. The second support rod 42 swings upward, and then the second extension end 55 moves downward. The second extension end 55 drives the sixth support rod 53 to swing backward through the fourth support rod 51, driving the backrest 30 to rotate backward around the hinge point 31 to open the backrest 30. At the same time, when the hinge rod 52 slides to the E hinge hole 17, the originally compressed two ends lose the pressure from the B connectors 12, elongate, and extend into the E hinge hole 17 for fixation, and the opening process of the entire wheelchair is completed.

[0073] In the present invention, the telescopic function of the two ends of the hinge rod 52 can be controlled electrically or manually. The telescopic structure of the two ends of the hinge rod 52 can be a mechanical spring, an electric spring, a hydraulic device, a pneumatic device, etc. The present invention does not limit the specific telescopic structure of the hinge rod 52. The hinge rod 52 is a telescopic structure, and the present invention does not specify this telescopic structure. As long as the telescopic structure meets the usage requirements.

[0074] The driving mechanism for driving the first folding mechanism 40 and its installation position are not specifically defined in the present invention. The driving mechanism can act on the first support rod 41, or on the second support rod 42, or on the second extension end 55, or on the hinge rod 52. Even the driving mechanism can directly act on the seat 20, as long as it can drive the first folding mechanism 40 to move. The present invention does not specify this driving mechanism and its installation position.

[0075] More preferably, the second folding mechanism 50 can also be driven to realize the folding and opening of the foldable wheelchair 100 of the present invention. Similarly, the driving mechanism for driving the second folding mechanism 50 and its installation position are not specifically defined in the present invention. The driving mechanism can act on the second extension end 55, or on the hinge rod 52, or on the fourth support rod 51, or on the sixth support rod 53. Even the driving mechanism can directly act on the backrest 30, as long as it can drive the second folding mechanism 50 to move. The present invention does not specify this driving mechanism and its installation position.

[0076] Moreover, the present invention does not specifically limit the driving force for driving the movement of the first folding mechanism 40 and the second folding mechanism 50, which can be manual or electric.

[0077] More preferably, a foldable wheelchair of the present invention can be directly manually folded. First, the two ends of the articulated rod 52 are retracted to disengage from the E hinge hole 17, and then the wheelchair of the present invention is directly folded. It can also be directly manually opened, until the two ends of the articulated rod 52 slide to the E hinge hole 17 and extend into the E hinge hole 17 for fixation.

[0078] In the third specific embodiment, on the basis of the foregoing embodiment, the number of the first folding mechanism 40 and the second folding mechanism 50 is 1. The first folding mechanism 40 includes 1 first support rod 41, 1 second support rod 42, 1 A connection seat, and 1 B connection seat. One end of the first folding mechanism 40 is connected to the middle of the movable chassis 60, and the other end is connected between the seats 20.

[0079] The second folding mechanism 50 includes a second extension end 55 on 1 second support rod, 1 fourth support rod 51, 1 sixth support rod 53, and a fifth support rod 54. The fourth support rod 51 is hinged to the articulated rod 52. One end of the sixth support rod 53 is respectively hinged to the fourth support rod 51, and the other end is fixedly connected to the backrest 30. The seat 20 and the backrest 30 are hinged by a bent pipe (the fifth support rod 54).

[0080] One end of the fifth support rod 54 is fixedly connected to the seat 20, and the other end is hinged to the backrest 30.

[0081] In the fourth specific embodiment, on the basis of the foregoing embodiment, the number of the first folding mechanism 40 is 1, and the number of the second folding mechanism 50 is 2.

[0082] The first folding mechanism 40 includes 1 first support rod 41, 1 second support rod 42, 1 A connection seat, and 1 B connection seat. One end of the first folding mechanism 40 is connected to the middle of the movable chassis 60, and the other end is connected between the seats 20. The second extension end 55 of the second support rod 42 is hinged to the middle of the articulated rod 52.

[0083] The second folding mechanism 50 includes a second extension end 55, a fourth support rod 51, a sixth support rod 53, and a fifth support rod 54. The number of the fourth support rod 51 and the second extension end 55, and the sixth support rod 53 and the fifth support rod 54 is 2. The fourth support rod 51 is hinged to both ends of the hinge rod 52. One end of the sixth support rod 53 is respectively hinged to the fourth support rod 51, and the other end is fixedly connected to the chair back 30. The second extension end 55, the fourth support rod 51, the sixth support rod 53, and the fifth support rod 54 form a four-bar linkage mechanism.

[0084] In the fifth specific embodiment, on the basis of the foregoing embodiments, as Figure 3-7 shown, the movable chassis 60 of a foldable wheelchair according to the present invention further includes a footrest 61 for placing the feet of the user. The footrest 61 can be folded independently or together with the seat 20 and the chair back 30.

[0085] As Figure 2 - Figure 5 shown, a cross bar 64 is provided on the movable chassis 60, and there are 2 connecting rods 62 on the cross bar 64. The footrest 61 is hinged between the 2 connecting rods 62 through 2 hinge holes 63.

[0086] One end of the first support rod 41 hinged to the A hinge hole 13 further specifically has a second extension end 68. The second extension end 68 is hinged to the first connecting rod 67. The first connecting rod 67 is hinged to the second connecting rod 66. The second connecting rod 66 is hinged to the footrest 61. The second extension end 68, the first connecting rod 67, the second connecting rod 66, and the movable chassis 60 form a new four-bar linkage. When the first support rod 41 swings downward (i.e., the seat is folded), the footrest 61 is driven to fold upward through the second extension end 68; when the first support rod 41 swings upward (i.e., the seat is opened), the footrest 61 is driven to rotate downward and open through the second extension end 68.

[0087] Preferably, a limiting member 65 is provided at the place where the footrest 61 is hinged to the second connecting rod 66. The connecting rod 66 and the footrest 61 are unidirectionally limited by the limiting member 65. When the connecting rod 66 moves, it will drive the footrest 61 to fold. When the wheelchair is unfolded, the footrest 61 can also be manually turned up to avoid the footrest 61 blocking the process of the user transferring to the wheelchair.

[0088] Preferably, a limiting device is further added to the footrest 61 to lock it when the footrest 61 rotates to the vertical state. The present invention does not further specify the structure of this limiting device as long as the footrest 61 can be locked in the vertical state. Therefore, the footrest 61 can be folded independently, manually, or driven by a driving device.

[0089] In summary, a novel folding mechanism of the present invention has the advantages of delicate design and ingeniously using a four-bar linkage mechanism to achieve complex series motion. The foldable chair frame of a foldable wheelchair of the present invention has various advantages such as convenient folding, fast folding, and simple structure.

[0090] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A novel folding mechanism for a foldable wheelchair, comprising a first folding mechanism and a second folding mechanism. The first folding mechanism and the second folding mechanism are series-connected four-bar structures, and the first folding mechanism and the second folding mechanism can move simultaneously; The first folding mechanism is a four-bar structure, including a first support rod, a second support rod, a first folding member, and a fixing member. One end of the first support rod and the second support rod are respectively hinged to the fixing member, and the other ends of the first support rod and the second support rod are respectively hinged to the first folding member; One end of the second support rod hinged to the first folding member further has a second extension end. The second folding mechanism includes the second extension end, a fourth support rod, a fifth support rod, and a second folding member. The second extension end is hinged to the fourth support rod, the fourth support rod is hinged to the second folding member, one end of the second folding member is hinged to the fifth support rod, and the other end of the fifth support rod is fixedly connected to the first folding member; The first folding mechanism is inclined, and the first support rod is fixedly connected to the fixing member through a connecting member, so that the first folding member is in a horizontal state; The second folding member includes a sixth support rod and a sixth extension end. The sixth support rod is respectively hinged to the fourth support rod and the fifth support rod. The length of the fourth support rod is greater than the lengths of the second extension end and the sixth support rod. One end of the sixth support rod hinged to the fifth support rod has a sixth extension end, and the sixth extension end is the structure that the second folding member needs to fold; The first folding member includes a third support rod and a third extension end. Both ends of the third support rod are respectively hinged to the first support rod and the second support rod. One end of the third support rod hinged to the first support rod further has a third extension end, and the third extension end is the structure that the first folding member needs to fold.

2. A foldable wheelchair, comprising a movable chassis, a seat, a backrest, and the novel folding mechanism according to claim 1. The first folding mechanism is installed between the movable chassis and the seat, the second folding mechanism is connected between the seat and the backrest, the first folding member includes the seat, and the second folding member includes the backrest.

3. A foldable wheelchair according to claim 2, characterized in that The first folding mechanism includes an A connecting seat and a B connecting seat, a first support rod and a second support rod. The A connecting seat is fixedly installed on the movable chassis, the B connecting seat is fixedly installed under the seat, and the first support rod and the second support rod are hinged between the A connecting seat and the B connecting seat; the first folding member includes the B connecting seat and the seat.

4. A foldable wheelchair according to claim 3, characterized in that It further includes a hinge rod. The B connecting seat is provided with a hinge hole, and the hinge rod can extend into the hinge hole or disengage from the hinge hole; both the second extension end and the fourth support rod are hinged to the hinge rod.

5. A foldable wheelchair according to claim 4, characterized in that The second folding mechanism includes a second extension end, a fourth support rod, a fifth support rod and a sixth support rod. One end of the sixth support rod is hinged to the fourth support rod, the other end of the sixth support rod is fixedly connected to the backrest, one end of the fifth support rod is hinged to the backrest, and the other end of the fifth support rod is fixedly connected to the seat.

6. A foldable wheelchair according to claim 5, characterized in thatIt further includes a first extension end, a first connecting rod, a second connecting rod and a footrest. The footrest is hinged to the movable chassis. One end of the first support rod hinged to the A connecting seat is provided with a first extension end, the first extension end is hinged to the first connecting rod, the first connecting rod is hinged to the second connecting rod, and the second connecting rod is hinged to the footrest.

7. A foldable wheelchair according to claim 6, wherein It further includes a limiting member. The second connecting rod and the footrest are unidirectionally limited by the limiting member. The footrest can be driven by the movement of the second connecting rod to fold or open, or can be folded or opened manually.

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