TWM543684U - Foldable wheelchair - Google Patents

Description

Foldable wheelchair

The present invention relates to a wheelchair that can be folded, especially a foldable wheelchair structure that is configured to fold and unfold before and after, and allows the foldable wheelchair to be operated as a walker after being folded back and forth.

The operation of the foldable wheelchair can provide physical disability or mobility for people to ride on, and the caregiver can carry the folding wheelchair around to move around. Moreover, the conventional folding wheelchair structure is mainly composed of a connecting rod assembly which can be deployed left and right and folded, and a seat cloth is arranged above the connecting rod assembly, and a front foot portion is arranged at the front end of the connecting rod assembly, and A main body portion is disposed at a rear end of the connecting rod assembly, and a front wheel is disposed on each of two sides of the bottom end of the front leg portion, and a main wheel is disposed on each of two sides of the bottom end of the main body portion, and the wheel diameter of the main wheel is larger than the wheel diameter of the front wheel. The foldable wheelchair structure, when in operation, deploys the link assembly toward the left and right sides, thereby unfolding the seat cloth disposed above the link assembly, and allowing the person with limited mobility to ride on the chair cloth. The caregiver can carry the foldable wheelchair movement by holding the push handle above the main body. The foldable wheelchair structure can be folded by the connecting rod assembly to the left and right sides, and the wheelchair volume can be reduced to reduce the space occupied during the placement, however, when the wheelchair can be folded After the combination, the length of the foldable wheelchair is unchanged from the front end to the rear end, and the two front wheels of the front end of the foldable wheelchair and the two main wheels of the rear end are close to each other, thereby greatly reducing the width of the wheelchair that can be folded, and Except for folding and placement, it cannot be used as a walker. Therefore, the currently available wheelchair structure can only provide a single use, and it is only a space-consuming item after folding, and it cannot produce a multiplication benefit. And there is indeed a need to study and innovate.

To solve this problem, the present invention provides a foldable wheelchair, comprising: a back bracket comprising spaced apart two side bars, the two side bars respectively having a first end and a second end, each side bar further comprising a first pivot portion, a second pivot portion and a third pivot portion formed between the first and second ends, the two rear wheels being rotatably coupled to the second ends of the two side bars, respectively The chair portion includes a base pipe and two connecting plates formed at both ends of the base pipe, each of the connecting plates includes a longitudinal body section and a diagonally extending section, and the seat part further includes a seat frame extending from the base pipe, the chair The frame includes a front end, and each longitudinal section of the connecting plate is pivotally connected to each second pivot of the back bracket, and the seat portion is pivotable relative to the back bracket between a first position and a second position, a latching member, The housing can be movably received in a base tube of the seat portion between a latching position and a release position, a seat panel fixed above the seat frame, and two first links, each of the first links including a first end And a second end, the first end of each first link is pivoted The obliquely extending section of the connecting plate and the two handrails are respectively pivotally connected to the third pivotal portions of the back bracket, and each of the handrails includes a joint, and the respective joints are respectively pivotally connected with the second end of the first link, When the seat portion pivots between the first and second positions, the armrest rods are synchronously pivoted, and a front leg portion includes spaced apart side segments and a horizontal section extending between the two side segments, the front leg portion The horizontal section is pivotally connected to each front end of the seat portion, and the two front wheels are rotatably coupled to the respective side sections of the front leg portion, and the second connecting rods each include a first pivoting end and a second pivoting end. The first pivoting end of each of the second links is pivotally connected to each side of the front leg portion, and the second pivoting ends of the second links are respectively pivotally connected to the first pivot portion of the back bracket.

In a state where the seat portion is at the first position, the seat portion and the back bracket are non-parallel, and each of the front wheels is substantially aligned with each of the rear wheels, and the seat portion and the back bracket are in a state where the seat portion is at the second position. The front wheel and the rear wheel are not aligned. When the seat portion is in the first position and the locking member is in the locked position, the locking member is engaged with the back bracket, and the seat portion is positioned at the first position. When the seat portion is in the first position and the lock member is in the release position, the lock member is not engaged with the back bracket, and the seat portion is pivotable from the first position to the second position.

The creation feature is that the front and rear legs and the front and rear of the seat portion are unfolded or folded, and the foldable wheelchair can be erected on the ground after being folded back and forth, so that the auxiliary wheel and the bottom of the main body are supported at the bottom end of the bracket. The wheels on the side are supported on the ground, so that the folding wheelchair volume can be reduced after folding and the wheelchair width can be folded, and the user can carry the handle as a walking aid.

The creation of the present invention will be more clearly understood by the detailed description of the illustrative embodiments of the present invention.

As shown in FIG. 1 , FIG. 2 , FIG. 3 , and FIG. 4 , the wheelchair 10 that can be folded in the present invention includes a back bracket 20 , a seat portion 36 and a front leg portion 72 , thereby forming a front and rear deployment. Or fold the structure. The back bracket 20 includes two side bars 22 extending longitudinally and spaced apart from each other. The two side bars 22 respectively have a first end 24 and a second end 26, and the first ends 24 of the two side bars 22 have a first fixing rod 23, a second fixing rod 25 is disposed between the second ends 26 of the two side rods 22, and the first end 24 of each side rod 22 extends rearward to form a push handle 28, the second side rod 22 A backing member 34 is disposed between the one end 24 and the second end 26. The second end 26 of the two side rods 22 respectively pivots a rear wheel 32. The two side bars 22 further include a first pivot portion 20A, a second pivot portion 20B, and a third pivot portion 20C formed between the first end 24 and the second end 26, respectively, the third pivot portion 20C being located Between the first end 24 and the second pivot 20B. Between the first end 24 and the second end 26 of the two side bars 22, a positioning portion 27 is disposed. The positioning portion 27 is provided with a positioning hole 29, and the positioning portion 27 is located at the first pivot portion 20A and the second pivot portion 20B. between.

As shown in FIG. 1 , FIG. 2 , FIG. 3 , and FIG. 4 , the seat portion 36 includes a base pipe 38 extending in the left-right direction, and the base pipe 38 includes a mounting groove 39 at each end, and The surface of the mounting groove 39 of the base pipe 38 includes a slide 47 extending to the left and right and communicating with the mounting groove 39. The mounting groove 39 is provided with a spring 41 extending left and right, and is disposed to be pressed against one end of the spring 41 and along the left and right sides. An extended latching member 43 (shown in FIG. 3), the surface of the latching member 43 includes a lever 45, the lever 45 is located at the slide 47 and the end of the lever 45 extends out of the slide 47, thereby The lever 45 can be manually moved to move the latching member 43 in the left-right direction between the latching position and a release position in the mounting slot 39. The two ends of the base pipe 38 have a connecting plate 40 extending in the longitudinal direction. Each of the connecting plates 40 has a longitudinal section 42 extending in the longitudinal direction. The ends of the longitudinal sections 42 of the engaging plates 40 are turned to form an obliquely extending section 44. The inclined section 44 of the 40 includes a connecting tube 46, and the side of the longitudinal section 42 of each of the engaging plates 40 includes a blocking piece 48 extending left and right. When the latching member 43 presses the spring 41 and the end of the latching member 43 protrudes from the engaging plate 40, the latching member 43 is in the latching position, and when the latching member 43 is moved at the end and retracted into the engaging plate 40, it is not extended. When the engagement piece 40 is released, the closure member 43 is in the release position.

As shown in FIGS. 1 and 2, the seat portion 36 includes two seat frames 56 spaced apart in the left-right direction, and the two frame frames 56 respectively have a front end 58 and a rear end 60 spaced apart in the front-rear direction. A pull rod 63 is disposed at the front end 58 of the two chair frame 56. A pair of posts 62 are disposed between the two chair frames 56. The rear end 60 of the two frame frames 56 is fixed to the surface of the base pipe 38. The seat portion 36 further includes a seat panel 131 having an upper surface 133 and a lower surface 135 spaced apart in the longitudinal direction, and the lower surface 135 of the seat panel 131 is abutted against the seat frame 56. Each of the longitudinal sections 42 of each of the engaging plates 40 is pivotally connected to each of the second pivot portions 20B of the back bracket 20 by a pivot 49, so that the seat portion 36 can be rotated by the pivot 49, and A position pivots between a position and a second position. When the seat portion 36 is in the first position, the seat portion 36 is non-parallel to the back bracket 20, and the angle between the seat portion 36 and the back bracket 20 is between 90 110 and 110 ,, that is, When the seat portion 36 is in the first position, the seat portion 36 is substantially perpendicular to the back bracket 20, and when the seat portion 36 is in the first position, the end of the locking member 43 extends into the back bracket. The positioning hole 29 of the positioning portion 27 of the side bar 22 of the 20 is in a locked state (as shown in FIG. 3), and the seat portion 36 is fully deployed forward in front of the back bracket 20 (as shown in Figs. 4 and 5). As shown, the flap 48 of the engagement plate 40 is located in front of each side bar 22 and can be used as a terminal stop when the seat portion 36 is rotated to the first position to prevent excessive rotation of the seat portion 36. When the end of the latching member 43 is withdrawn from the positioning hole 29 of the positioning portion 27, the latching member 43 is in the releasing position, so that the seat portion 36 can be the pivoting center 49 as the center of rotation, and the first position toward the back bracket 20 Rotate backwards to the second position.

As shown in FIG. 1 and FIG. 2, the wheelchair 10 of the present invention further includes two first links 50, each of the first links 50 having a first end 52 and a second end spaced apart in the longitudinal direction. The first end 52 of each of the first links 50 is pivotally disposed on the post 46 provided on the side of the obliquely extending section 44 of each of the engaging plates 40. The wheelchair 10 and the front and rear folding wheelchairs 10 further include two handrails 111. Each of the handrails 111 has a joint 113 at one end thereof. The adapter 113 has a pivoting plate 115 extending in the front-rear direction. The connecting plate 115 is pivotally disposed at the second end 54 of each of the first links 50.

As shown in FIG. 1 and FIG. 2, the foldable wheelchair 10 further includes a hook plate 64 having a hook end 66 and a pivot end 68 spaced apart in the front-rear direction. The hook end 66 has a slot 70. The hook end 66 and the pivot end 68 have a paddle 71. The pivoting end 68 of the hook plate 64 is pivotally disposed on the surface of the grab bar 111 and adjacent thereto. Adapter 113.

As shown in FIGS. 1 and 2, the front leg portion 72 of the foldable wheelchair 10 has a cross section 74 extending in the left-right direction, and the two ends of the cross section 74 have a side section 76 extending toward the longitudinal direction. The cross section 74 has a first pivoting arm 78, each side section 76 has a second pivoting arm 80, and a round frame 96 is disposed at the end of each side section 76. A front wheel 98 is pivoted at the bottom end of each wheel frame 96, and each side section 76 is disposed. A stand 117, a pedal 119 is disposed on each of the stand 117, and each of the stand 117 is rotatable between the longitudinal and front and rear angles. The forefoot 72 is pivoted with the first pivot 78 and the front end 58 of the seat frame 56 of the seat portion 36.

As shown in FIG. 1 and FIG. 2, the wheelchair 10 can be folded and includes two second links 82. Each of the second links 82 has a first pivoting end 84 and a space spaced apart in the front-rear direction. The second pivoting end 86 is pivotally disposed with the second pivoting end 80 of the front leg portion 72. The second pivoting end 86 is pivotally disposed on the side rails 22 of the back bracket 20 A pivot 20A. The foldable wheelchair 10 further includes two extending arms 88. The two extending arms 88 have a positioning end 90 and a supporting end 92 spaced apart in the front-rear direction, and the positioning end 90 of each extending arm 88 is fixed to each second. The connecting rod 82 and the supporting end 92 of each extending arm 88 are provided with an auxiliary wheel 94.

The present invention is used for the operation of the foldable wheelchair 10, which rotates the seat portion 36 away from the front of the back bracket 20, and when the seat portion 36 is rotated to the first position, the base tube 38 is blocked at both ends. The end of the member 43 extends into the positioning hole 29 of the positioning portion 27 of each side bar 22 of the back bracket 20, so that the latching member 43 is in a locked state, and the seat portion 36 is fully deployed and engaged and positioned in front of the back bracket 20, At the bottom of the side bracket 22 of the back bracket 20, the rear wheel 32 is erected on the ground. The front wheels 98 at the bottom end of the side section 76 of the front leg portion 72 are erected on the ground and are aligned with the rear wheels 32. The extension arm 88 The auxiliary wheel 94 is not in contact with the ground, so that the seat portion 36 is stably fully deployed, and the person who is physically disabled or inconvenient to move can sit on the seat panel 131 and the foot step on the pedal 119, so that the caregiver can use the hand The push handle 28 is held to perform the folding of the wheelchair 10 to move.

The present invention is used for the operation of folding the wheelchair 10 before and after folding. After the wheelchair 10 that can be folded is used, the latch 43 can be manually moved to move the latch 43 to the release position, and the lever can be pulled by hand. 63 or pulling the seat panel 131 to rotate the seat portion 36 rearward toward the back bracket 20, so that the seat portion 36 is folded rearward toward the back bracket 20 with the pivot 49 as a center of rotation, and when the seat portion 36 is rotated backward At the same time, the front leg portion 72 and the second second link 82 are rearwardly folded toward the back bracket 20, whereby the two extension arms 88 are rotated along with the two second links 82, so that the two extensions are extended. The auxiliary wheel 94 provided at one end of the arm 88 and the rear wheel 32 of the back bracket 20 can be erected to the ground, and the hook plate 64 can be utilized when the seat portion 36 is rotated toward the second bracket 20 to the second position. The slot 70 of the hook end 66 is hooked on the wheel frame 96 of the front leg portion 72, and the front leg portion 72 is folded back to abut the front of the seat portion 36 and the hook plate is obtained. 4, the positioning of the buckle, at this time, the seat portion 36 and the back bracket 20 are substantially parallel, and each front wheel 98 and each of the rear wheels 32 are not aligned back and forth, thus, the entire foldable wheelchair 10, after the front and rear folding operation, Although the overall volume is reduced, but the overall width is not changed, the width of the back bracket 20 is maintained to be the same as the width of the shoulder of the human body, and the disabled or slightly injured person is used in the wheelchair 10 which can be folded. After the combination, the wheelchair 10 can still be used as a walking aid for carrying out operations or rehabilitation activities.

The basic teachings of this creation have been described in the preceding paragraphs, and many extensions and variations will be apparent to those having ordinary skill in the art, for example, the latching member 43 provided at the two ends of the base pipe 38 and The spring 41 can be locked or unlocked for the front and rear unfolding of the seat portion 36 as long as one set is provided. Moreover, the two chair frames 56 of the seat portion 36 form an integrated frame 56 structure, and the seat plate 131 can still be fixed thereon without affecting the seat portion 36 being able to be received toward the back bracket 20 in the unlocked state. Operation.

The present invention disclosed in the specification is to be considered as illustrative and not restrictive. The scope of the present invention is defined by the scope of the appended claims, and is not intended to be limited by the scope of the invention.

10‧‧‧ Wheelchair 20‧‧‧Back bracket 20A‧‧‧First pivot 20B‧‧‧Second pivot 20C‧‧‧Three pivot 22‧‧‧ Sidebar 23‧‧‧First fixed rod 24 ‧‧‧First end 25‧‧‧Second fixed rod 26‧‧‧Second end 27‧‧‧ Positioning part 28‧‧‧ Pusher 29‧‧‧ Positioning hole 32‧‧‧ Rear wheel 34‧‧ Back Fittings 36‧‧‧Seats 38‧‧‧Bases 39‧‧‧ Mounting troughs 40‧‧‧Connecting plates 41‧‧‧ Springs 42‧‧‧Length section 43‧‧‧Locking parts 44‧‧‧ Oblique extension Paragraph 45‧‧ ‧Tie 46‧‧‧Receive 48‧‧ ‧Flap 49‧‧‧Pivot 50‧‧‧ First Link 52‧‧‧ First End 54‧‧‧ Second End 56‧‧‧ Chair frame 58‧‧‧ front end 60‧‧‧ rear end 62‧‧‧ post 64‧‧‧ hook plate 63‧‧‧ rod 66‧‧‧ hook end 68‧‧‧ pivot end 70‧‧‧ slot 71‧‧‧Picks 72‧‧‧Front foot 74‧‧‧cross section 76‧ Side section 78‧‧‧First pivot 80‧‧‧Second pivot 82.‧‧Second link 84‧‧‧First pivoting end 86‧‧‧Second pivoting end 88‧‧‧ Extension arm 90‧‧‧ Positioning end 92‧‧‧ Supporting end 94‧‧‧Assisting wheel 96‧‧‧ Wheel frame 98‧‧‧ Front wheel 111‧‧‧Handrail lever 113‧‧‧ Adapter 115‧‧‧ pivoting plate 117 ‧‧‧Foot frame 119‧‧‧ pedal 131‧‧‧ chair panel 133‧‧‧ upper surface 135‧‧‧ lower surface

The first picture is an exploded perspective view of a wheelchair that can be folded.

The second picture shows the stereoscopic appearance of the wheelchair combination that can be folded.

Fig. 3 is a cross-sectional view taken along line 3-3 of Fig. 2;

Figure 4 is a perspective view of another perspective of a wheelchair that can be folded.

Figure 5 is a side view of the use of a wheelchair that can be folded.

Figure 6 is a side view of the folding operation of the foldable wheelchair.

Figure 7 is a perspective view of the folding operation of the wheelchair that can be folded.

Figure 8 is a side view of the folded and folded wheelchair.

Figure 9 is a perspective view of the folding and folding of the wheelchair.

All of the drawings are merely illustrative of the basic teachings of the present invention, and the extension of the number, position, relationship, and size of the components constituting the preferred embodiment will be explained in the drawings. Post-related changes are implemented in industry skills. In addition, the changes in the exact dimensions and size ratios associated with specific strengths, weights, strengths and similar requirements are also within the skill of the industry after reading and understanding the teachings of this creation.

In the different figures, the same reference numerals are used to designate the same or similar elements. In addition, please refer to the text such as "first", "second", "main", "end", "part", "segment", etc. and the like. The terminology is only for the viewer to refer to the construction in the figure and is only used to help describe the creation.

10‧‧‧ Wheelchair

20‧‧‧Back bracket

20A‧‧‧First Pivot

20B‧‧‧Second pivot

20C‧‧‧The third pivot

22‧‧‧ Sidebar

23‧‧‧First fixed rod

24‧‧‧ first end

25‧‧‧Second fixed rod

26‧‧‧ second end

27‧‧‧ Positioning Department

28‧‧‧ push

29‧‧‧Positioning holes

32‧‧‧ Rear wheel

34‧‧‧Backrest

36‧‧‧Seat department

38‧‧‧Base rod

39‧‧‧Installation slot

40‧‧‧Connecting board

41‧‧‧ Spring

42‧‧‧

43‧‧‧Locking parts

44‧‧‧ oblique section

46‧‧‧ take over

48‧‧ ‧Flap

49‧‧‧ pivot

50‧‧‧ first link

52‧‧‧ first end

54‧‧‧second end

56‧‧‧ Chair frame

58‧‧‧ front end

60‧‧‧ Backend

62‧‧‧Post

63‧‧‧ lever

64‧‧‧ hook board

66‧‧‧ hook end

68‧‧‧ pivot end

70‧‧‧ slotted

71‧‧ ‧ picks

72‧‧‧Front foot

74‧‧‧cross section

76‧‧‧ side section

78‧‧‧First pivot

80‧‧‧Second pivot

82‧‧‧Second link

84‧‧‧First pivoting end

86‧‧‧Second pivot

88‧‧‧Extension arm

90‧‧‧ Positioning end

92‧‧‧Support

94‧‧‧Assistance wheel

96‧‧‧ round frame

98‧‧‧ Front wheel

111‧‧‧Handrail

113‧‧‧Adapter

115‧‧‧ pivot board

117‧‧‧foot stand

119‧‧‧ pedal

131‧‧‧ Chair board

133‧‧‧ upper surface

135‧‧‧ lower surface

Claims (8)

A foldable wheelchair comprising: a back bracket comprising spaced apart two side bars, the two side bars respectively having a first end and a second end, each side bar further comprising a first and a second respectively formed a first pivot portion, a second pivot portion and a third pivot portion between the ends; two rear wheels respectively rotatably coupled with the second ends of the two side bars; a seat portion including a base tube And two connecting plates formed at two ends of the base pipe, each of the connecting plates includes a longitudinal body portion and a diagonally extending portion, the seat portion further includes a seat frame extending from the base pipe, the seat frame including a front end, the connecting plate Each of the longitudinal sections is pivotally connected to each of the second pivots of the back bracket, and the seat portion is pivotable relative to the back bracket between a first position and a second position; a latching member can be in a latched position and a The release position is movably received in the base pipe of the seat portion; a seat plate is fixed on the seat frame; and the first link includes a first end and a second end, each of the first link First end of the first link The two armrests are respectively pivotally connected to the third pivots of the back brackets, and each of the handrails includes a joint, and each of the joints and the second end of the first link respectively And the seat portion synchronously pivots when the seat portion pivots between the first position and the second position; a front foot portion including the spaced side portions and a horizontal portion extending between the two side portions, the front foot The cross section of the portion is pivotally connected to each front end of the seat portion; the two front wheels are rotatably coupled to the respective side portions of the front leg portion; and the second connecting rods each include a first pivoting end and a second pivot a first pivoting end of each second link is pivotally connected to each side of the front leg portion, and a second pivoting end of each second link is respectively pivotally connected to the first pivot portion of the back bracket; In a state in which the portion is in the first position, the seat portion is non-parallel to the back bracket, and each of the front wheels is substantially aligned with each of the rear wheels, and the seat portion is substantially parallel to the back bracket in a state where the seat portion is at the second position. And each front wheel is not aligned with each rear wheel, and is located first in the seat portion And the locking member is in the locked position, the locking member is engaged with the back bracket, the seat portion is positioned in the first position, and the locking member and the back are in a state where the seat portion is in the first position and the locking member is in the releasing position. The bracket is not fitted, and the seat portion is pivotable from the first position to the second position. The wheelchair capable of folding as described in claim 1, further comprising: two extending arms, each of which includes a positioning end fixed to the second link and a support end; two auxiliary wheels, respectively The support end of the extension arm is pivotally connected; in the state where the seat portion is in the first position, each of the auxiliary wheels is aligned with the front and rear wheels and each rear wheel is located between the front wheel and the auxiliary wheel, and is located at the second position in the seat portion In the state, each of the auxiliary wheels is aligned with the rear wheel and each of the auxiliary wheels is located in front of the rear wheel, and each of the rear wheels and each of the auxiliary wheels supports the wheelchair. The folding wheelchair according to claim 1, wherein each of the connecting plates further comprises a blocking piece formed on one side of the longitudinal section; and in a state where the seat part is in the first position, each of the blocking pieces respectively abuts Each of the side bars of the back bracket is spaced apart from the side bars of the back bracket in a state where the seat portion is in the second position. The wheelchair capable of folding as described in claim 1, further comprising: a hook plate pivotally mounted on the back bracket, the hook plate including a hook end; wherein the seat portion is in the first position The hook end of the hook plate is separated from the front leg portion. In a state where the seat portion is at the second position, the hook end of the hook plate is engaged with the front leg portion, so that the seat portion is positioned at the second position. A foldable wheelchair includes: a back bracket including two first ends and two second ends; two rear wheels respectively pivotally connected to the two second ends of the back bracket; a seat portion, including a two connecting plates pivotally connected to the back bracket and a front end spaced apart from the connecting plate, each connecting plate comprising an obliquely extending section, the seat portion being pivotable relative to the back bracket between a first position and a second position Two armrest bars respectively pivotally connected to the back brackets, each of the handrail bars including a joint formed at the end; two first links each including a first end pivotally connected to each of the obliquely extending sections of the connecting plates And a second end pivotally connected to the adapter of the grab bar, respectively, the seat portion is synchronously pivoted when the seat portion is pivoted between the first and second positions; a front leg portion and a front end of the seat portion The two front wheels are rotatably coupled to the front leg; the two second links each include a first pivoting end pivotally connected to the front leg and a second pivoting end pivotally connected to the back bracket. Said The chair portion is located between each of the handrail bars and each of the second links; in a state where the seat portion is at the first position, the seat portion and the back bracket are non-parallel, and each front wheel is substantially aligned with each of the rear wheels, in the seat In the state in which the portion is in the second position, the seat portion is substantially parallel to the back bracket, and each of the front wheels is not aligned with each of the rear wheels. The wheelchair capable of folding as described in claim 5, further comprising: two extension arms each including a positioning end fixed to the second link and a support end; two auxiliary wheels, respectively The support end of the extension arm is pivotally connected; in the state where the seat portion is in the first position, each of the auxiliary wheels is aligned with the front and rear wheels and each rear wheel is located between the front wheel and the auxiliary wheel, and is located at the second position in the seat portion In the state, each of the auxiliary wheels is aligned with the rear wheel and each of the auxiliary wheels is located in front of the rear wheel, and each of the rear wheels and each of the auxiliary wheels supports the wheelchair. The foldable wheelchair according to claim 5, wherein each of the connecting plates further comprises a blocking piece formed on one side of the longitudinal section; and in a state where the seat part is in the first position, each of the blocking pieces respectively abuts Each of the side bars of the back bracket is spaced apart from the side bars of the back bracket in a state where the seat portion is in the second position. The foldable wheelchair of claim 5, wherein the seat portion further comprises a base rod and a mounting groove formed in the base rod, further comprising: a latching member in a latching position and a The release position is displaceably accommodated in the mounting groove of the seat portion, and the latching member is in the locked position, a part of the latching member is located outside the mounting slot, and the latching member is in the releasing position, and the latching member is completely retracted and mounted. a hook plate pivoted on the back bracket, the hook plate includes a hook end; in a state where the seat portion is in the first position, the hook end of the hook plate is separated from the front leg portion, in the seat portion In a state of being in the first position and the locking member is in the locked position, the locking member is engaged with the back bracket, the seat portion is positioned at the first position, and the seat portion is in the first position and the locking member is in the released position, and is locked The piece is not fitted to the back bracket, and the seat portion can be pivoted from the first position to the second position, and in the state where the seat portion is in the second position, the card Hook end plate and the front engaging leg portion, causing the seat portion is positioned at the second position.