CN217339166U - Foldable wheelchair - Google Patents

Abstract

The utility model provides a foldable wheelchair, which comprises a chassis, a seat component with a seat rod and a backrest rod, and a supporting component with an upper front stay bar and a lower front stay bar and a rear stay bar, wherein the backrest rod is rotationally connected with the seat rod and extends downwards from the joint to form an extension part, two ends of the upper front stay bar are rotationally connected with the middle part of the seat rod and the middle part of the lower front stay bar respectively, two ends of the lower front stay bar are rotationally connected with the middle part of the extension part and the front part of the chassis respectively, and two ends of the rear stay bar are rotationally connected with the lower end part of the extension part and the rear end part of the chassis respectively, so that two four-bar mechanisms between the seat rod and the chassis can be linked, the operation is convenient, the comfort is good, the length of each rod piece can be adjusted by changing the height of the seat rod when the chassis is unfolded, the adaptability is good, the chassis is not folded, the safety is good, and the extension part is sequentially arranged in the left and right directions by making the lower front stay bar, the rear stay bar and the upper front stay bar, when the seat is unfolded, the lower front support rod can be tightly propped against the rear support rod and/or the seat rod to form a support, so that unidirectional self-locking is realized, and the structure is simple.

Description

Foldable wheelchair

Technical Field

The utility model belongs to the field of medical equipment, concretely relates to collapsible wheelchair.

Background

A wheelchair is a medical apparatus, is used for assisting patient's treatment and rehabilitation, usually include the seat, the back, and the wheel assembly used for driving the wheelchair to move, the traditional wheelchair is mostly not collapsible, the occupation space is large, in order to solve this problem, but the collapsible wheelchair appears on the market, its folding mainly includes the folding movements of seat and back and reduction action of the seat height, the conventional collapsible wheelchair does not have linkage on these two movements, need to go on separately, it is inconvenient to operate, there is collapsible wheelchair that can realize linkage too, but this kind of wheelchair mostly realizes linkage through the relative rotation of front wheel support and rear wheel support, because the front, rear wheel support needs to be forked setting, cause the size of the seat not too big, the travelling comfort is not good, and the change degree of the seat height is limited by the change degree that the seat and back are folded, difficult to adjust according to the actual demand of the seat height, when the folding bicycle is folded, the front wheel and the rear wheel can be drawn close to each other, the feet and other parts are easily crushed and injured, the safety is poor, the unfolding bicycle is unstable, the locking mechanism needs to be additionally arranged for locking, and the structure is complex.

Disclosure of Invention

The utility model aims at overcoming the defects of the prior art and providing a foldable wheelchair with convenient operation, good comfort, good adaptability, good safety and simple structure.

In order to achieve the above object, the utility model adopts the technical scheme that the foldable wheelchair comprises:

the bottom of the chassis is connected with a wheel assembly;

the seat assembly comprises a seat rod and a backrest rod, the seat rod is positioned above the chassis, the backrest rod is rotatably connected with the seat rod, and the backrest rod extends downwards from the rotary connection position of the backrest rod and the seat rod to form an extension part;

the support assembly comprises an upper front support rod, a lower front support rod and a rear support rod, the upper end of the upper front support rod is rotatably connected with the middle part of the seat rod, the lower end of the upper front support rod is rotatably connected with the middle part of the lower front support rod, the lower end of the lower front support rod is rotatably connected with the front part of the chassis, the upper end of the rear support rod is rotatably connected with the lower end of the extension part, and the lower end of the rear support rod is rotatably connected with the rear end of the chassis;

the upper end part of the lower front support rod is rotatably connected with the middle part of the extension part, so that a first four-bar linkage mechanism consisting of the extension part, the seat rod, the upper front support rod and the lower front support rod is linked with a second four-bar linkage mechanism consisting of the rear support rod, the extension part, the lower front support rod and the chassis; the lower front support rod and the rear support rod are positioned on a first plane, the upper front support rod and the extension part are positioned on a second plane, the first plane and the second plane are sequentially arranged in the left-right direction, when the backrest rod is turned backwards to unfold the seat assembly, the lower front support rod can be tightly abutted against the rear support rod and/or the seat rod to form a support through linkage, the backrest rod is prevented from being turned backwards continuously, and unidirectional self-locking is realized; when the backrest rod is turned forwards to fold the seat assembly, the backrest rod, the seat rod, the lower front support rod and the rear support rod can be sequentially drawn close to the chassis to be folded through the linkage, and the upper front support rod and the lower front support rod are folded in a staggered mode.

Preferably, when the lower front stay abuts against the rear stay, the lower front stay is perpendicular to the rear stay.

Preferably, when the lower front stay abuts against the seat post, the lower front stay is perpendicular to the upper front stay.

Preferably, when the seat assembly is unfolded, the backrest rod extends obliquely backwards and upwards, and the included angle between the backrest rod and the vertical direction is 10-20 degrees.

Preferably, the seat post is high in front and low in back and parallel to the chassis when the seat assembly is deployed.

Preferably, the chassis is provided with a connecting seat for rotatably connecting the lower front stay bar and the rear stay bar.

Further preferably, the connecting seat is located outside the first plane.

Preferably, a rotatable armrest is connected to the middle of the back rest lever.

Further preferably, the chassis is of a frame structure, the projection of the chassis in the vertical direction is square, and the wheel assembly is connected to four corners of the bottom of the chassis.

Further preferably, the wheel assembly comprises a motorized wheel assembly.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the utility model provides a foldable wheelchair, which comprises a chassis, a seat component with a seat rod and a backrest rod, and a supporting component with an upper front stay bar and a lower front stay bar and a rear stay bar, wherein the seat rod is positioned above the chassis, the backrest rod is rotationally connected with the seat rod and extends downwards from the joint to form an extension part, two end parts of the upper front stay bar are respectively rotationally connected with the middle part of the seat rod and the middle part of the lower front stay bar, the lower end part of the lower front stay bar is rotationally connected with the front part of the chassis, the upper end part and the lower end part of the rear stay bar are respectively rotationally connected with the lower end part of the extension part and the rear end part of the chassis, through rotationally connecting the upper end part of the lower front stay bar with the middle part of the extension part, a first four-bar linkage mechanism consisting of the extension part, the seat rod, the upper front stay bar and the lower front stay bar is linked with a second four-bar linkage mechanism consisting of the rear stay bar, the extension part, the lower front stay bar and the chassis, the folding process is not influenced by the size of the seat rod, the seat rod with larger size can be selected, the comfort is good, the length of each rod piece of the two four-bar mechanisms can be adjusted through adjusting, the height of the seat rod when the seat rod is unfolded is changed, the adaptability is good, the chassis does not participate in folding, the wheel assembly does not move, the safety is good, the lower front support rod and the rear support rod, the upper front support rod and the extension part are sequentially arranged in the left and right directions, when the seat component is unfolded through backward overturning of the backrest rod, the lower front support rod can tightly abut against the rear support rod and/or the seat rod through linkage to form support, the backrest rod is prevented from being continuously overturned backward, the unidirectional self-locking is realized, the stability is good, and the structure is simple.

Drawings

Fig. 1 is a perspective view of a preferred embodiment of the present invention.

Fig. 2, 3 and 4 are schematic left side views of fig. 1, wherein fig. 2 is in an unfolded state, fig. 4 is in a folded state, and fig. 3 is in an intermediate state during the unfolding and folding transformation.

Wherein: 10. a chassis; 11. a wheel assembly; 12. a connecting seat; 20. a seat assembly; 21. a seat post; 22. a back rest rod; 221. an extension portion; 23. a grab rail; 30. a support assembly; 31. an upper front stay bar; 32. a lower front stay bar; 33. a rear stay bar; 34. a first four-bar linkage; 35. a second four-bar linkage.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to make clear and definite definitions of the protection scope of the present invention.

The utility model describes the fore-and-aft direction, the left-and-right direction and the up-and-down direction are based on the fore-and-aft direction, the left-and-right direction and the up-and-down direction observed when a rider takes the foldable wheelchair.

The invention will be further described with reference to examples of embodiments shown in the drawings.

As shown in fig. 1 to 4, the utility model provides a foldable wheelchair, comprising: the seat comprises a chassis 10, a seat assembly 20 and a support assembly 30, wherein the chassis 10 is of a frame structure, the projection of the chassis 10 in the vertical direction is square, the bottom of the chassis 10 is connected with four wheel assemblies 11, the four wheel assemblies 11 are respectively connected to four corners of the bottom of the chassis 10, and the wheel assemblies 11 comprise electric wheel assemblies so as to realize electric drive; the seat assembly 20 comprises a seat rod 21 and a backrest rod 22, the seat rod 21 is positioned above the chassis 10, the lower end of the backrest rod 22 is rotatably connected with the rear end of the seat rod 21, and the lower end of the backrest rod 22 continuously extends downwards from the rotary connection position of the backrest rod 22 and the seat rod 21 to form an extension part 221; the support assembly 30 includes an upper front brace 31, a lower front brace 32 and a rear brace 33, the upper end of the upper front brace 31 is rotatably connected to the middle of the seat bar 21, the lower end of the upper front brace 31 is rotatably connected to the middle of the lower front brace 32, the upper end of the lower front brace 32 is rotatably connected to the middle of the extension 221, the lower end of the lower front brace 32 is rotatably connected to the front of the chassis 10, the upper end of the rear brace 33 is rotatably connected to the lower end of the extension 221, and the lower end of the rear brace 33 is rotatably connected to the rear of the chassis 10, so that two four-bar linkages are formed between the seat bar 21 and the chassis 10, the two four-bar linkages are respectively a first four-bar linkage 34 composed of the extension 221, the seat bar 21, the upper front brace 31 and the lower front brace 32 and a second four-bar linkage 35 composed of the rear brace 33, the extension 221, the lower front brace 32 and the chassis 10, and the two four-bar linkages share the lower front brace 32 and the extension 221, the two four-bar mechanisms can form linkage, so that folding of the seat assembly 20 and reduction of the height of the seat rod 21 are synchronously realized, the operation is convenient, in the folding process of the seat assembly 20, the seat rod 21 is in a parallel downward moving state, interference on the folding process is avoided, namely, the size of the seat rod 21 does not influence the folding process, the seat rod 21 with larger size can be selected, the riding comfort is improved, the height of the seat rod 21 in the unfolding process can be changed by adjusting the length and the connecting position of each rod piece (such as the connecting position of the front support rod 32 and the extension part 221) in the two four-bar mechanisms, and the four-bar mechanisms are suitable for different requirements of users and have good adaptability; the chassis 10 does not act and participate in folding in the folding process, the relative position of the wheel component 11 does not change, the phenomena of crushing and hurting feet of people do not exist, and the safety is better; the lower front support rod 32 and the rear support rod 33 are positioned on a first plane, the upper front support rod 31 and the extension part 221 are positioned on a second plane, the first plane and the second plane are sequentially arranged in the left-right direction, when the backrest rod 22 is turned backwards to unfold the seat assembly 20, the lower front support rod 32 can be tightly abutted against the rear support rod 33 through linkage to form support, the backrest rod 22 is prevented from being turned backwards continuously, unidirectional self-locking is realized, after unfolding, locking can be realized only by pressing the backrest rod backwards after a user sits, an additional locking mechanism is not needed, the structure is simpler, and in order to ensure safety, a common safety mechanism can be arranged in the two four-bar mechanisms, and the bars can not rotate relatively when unfolding; when the backrest rod 22 is turned forward to fold the seat assembly 20, the backrest rod 22, the seat rod 21, the lower front stay 32 and the rear stay 33 can be sequentially drawn toward the chassis 10 to be folded through linkage, and the upper front stay 31 and the lower front stay 32 are folded in a staggered manner, so that the folded effect is better, and the occupied space is smaller.

In this embodiment, in order to facilitate the user to press the back rod 22 backwards, when the seat assembly 20 is unfolded, the back rod 22 is inclined and extended backwards and upwards, the included angle between the back rod 22 and the vertical direction is 10 °, of course, the size of the included angle can be changed by adjusting the length and the connection position of each rod member in the two four-bar mechanisms, and in order to prevent the discomfort and the potential overturning hazard caused by excessive backward leaning, the adjustment range of the included angle is preferably 10-20 °.

In order to further improve the stability in the unfolded state, in this embodiment, when the seat assembly 20 is unfolded, the lower front stay 32 is perpendicular to the rear stay 33, so that the lower front stay 32, the chassis 10 and the rear stay 33 form a stable right triangle structure, the part of the lower front stay 32 rotatably connected with the extension part 221 is located at the upper rear part of the abutting part of the lower front stay 32 and the rear stay 33, and due to the limitation of the included angle between the backrest rod 22 and the vertical direction, the distance between the rotatably connected part and the abutting part is relatively short, so that the moment radius of the force of the backrest rod 22 turning backwards acting on the abutting part is relatively short, thereby improving the stability in the supporting process.

To further improve the comfort of the user and the high-grade lever of the foldable wheelchair, in the embodiment, when the seat assembly 20 is unfolded, the seat lever 21 is at an angle of 5 ° between the front, the rear and the lower, and the horizontal plane, and the seat lever 21 is also parallel to the chassis 10, that is, the chassis 10 is in an inclined state of the front, the rear and the lower, which can be realized by adjusting the turning radius of the wheel assembly 11 and the connecting position of the rotating shaft of the wheel assembly 11 and the chassis 10.

In order to further improve the riding comfort, a rotatable armrest 23 is connected to the middle of the backrest rod 22, and the armrest 23 may be an armrest with a locking function according to the prior art.

For the convenience of connection, the chassis 10 is further provided with a connecting seat 12 for rotatably connecting the lower front brace 32 and the lower rear brace 33, and the connecting seat 12 is protruded upward and is located outside the first plane to avoid interference with the movement of the two four-bar linkages.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (10)

1. A collapsible wheelchair comprising:

the bottom of the chassis is connected with a wheel assembly;

the seat assembly comprises a seat rod and a backrest rod, the seat rod is positioned above the chassis, the backrest rod is rotatably connected with the seat rod, and the backrest rod extends downwards from the rotary connection position of the backrest rod and the seat rod to form an extension part;

the support assembly comprises an upper front support rod, a lower front support rod and a rear support rod, the upper end of the upper front support rod is rotatably connected with the middle part of the seat rod, the lower end of the upper front support rod is rotatably connected with the middle part of the lower front support rod, the lower end of the lower front support rod is rotatably connected with the front part of the chassis, the upper end of the rear support rod is rotatably connected with the lower end of the extension part, and the lower end of the rear support rod is rotatably connected with the rear end of the chassis;

the method is characterized in that:

the upper end part of the lower front support rod is rotatably connected with the middle part of the extension part, so that a first four-bar linkage mechanism consisting of the extension part, the seat rod, the upper front support rod and the lower front support rod is linked with a second four-bar linkage mechanism consisting of the rear support rod, the extension part, the lower front support rod and the chassis; the lower front support rod and the rear support rod are located on a first plane, the upper front support rod and the extending portion are located on a second plane, and the first plane and the second plane are sequentially arranged in the left-right direction.

2. The foldable wheelchair as recited in claim 1, wherein: when the lower front supporting rod abuts against the rear supporting rod, the lower front supporting rod is perpendicular to the rear supporting rod.

3. The foldable wheelchair as recited in claim 1, wherein: when the lower front stay bar abuts against the seat bar, the lower front stay bar is perpendicular to the upper front stay bar.

4. The foldable wheelchair as recited in claim 1, wherein: when the seat assembly is unfolded, the backrest rod extends obliquely backwards and upwards, and an included angle between the backrest rod and the vertical direction is 10-20 degrees.

5. The foldable wheelchair of claim 1, wherein: the seat post is high in front and low in back and parallel to the chassis when the seat assembly is deployed.

6. The foldable wheelchair as recited in claim 1, wherein: and the chassis is provided with a connecting seat which is used for rotatably connecting the lower front support rod and the rear support rod.

7. The foldable wheelchair as recited in claim 6, wherein: the connecting seat is positioned on the outer side of the first plane.

8. The foldable wheelchair of claim 1, wherein: the middle part of the backrest rod is connected with a rotatable armrest.

9. The foldable wheelchair as recited in any one of claims 1 to 8, wherein: the chassis is of a frame structure, the projection of the chassis in the vertical direction is in a shape of a Chinese character kou, and the wheel assemblies are connected to four corners of the bottom of the chassis.

10. The foldable wheelchair as recited in claim 9, wherein: the wheel assembly includes a motorized wheel assembly.

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