CN213910935U - Wheel chair - Google Patents

Abstract

A wheelchair includes a seat, a backrest, a first link, a second link, a third link, an actuating member, and a guide. The chair seat comprises a main chair frame and a sub-chair seat. The sub-seat is arranged in the main seat frame and is pivoted to the main seat frame. The actuating member is fixed on the sub-seat and has an arc-shaped guide groove. The arc-shaped guide groove is provided with a first upper endpoint, a middle low point and a second upper endpoint. The guide rod is fixed on the third connecting rod and inserted into the arc-shaped guide groove. During the process of rotating the backrest from the upright position to the lying position, the sub-seat is actuated by the first connecting rod, the second connecting rod, the third connecting rod and the guide rod to rotate upwards until the guide rod moves from the first upper end point of the arc-shaped guide groove to the middle low point. Subsequently, the sub-seat is driven downward until the guide rod moves to the second upper end point of the arc-shaped guide groove. At this time, the main chair frame and the sub-chair seat are coplanar. The sub-seat of the chair seat of the wheelchair of the utility model can firstly rotate upwards and then rotate downwards in the process that the backrest rotates from the upright position to the flat lying position, so that the patient can not slide downwards.

Description

Wheel chair

Technical Field

The utility model relates to a wheelchair, in particular to a wheelchair which can prevent a patient from sliding down when a backrest rotates from a standing position to a lying position.

Background

The existing wheelchair has a design that the angle between the backrest and the seat can be adjusted. Even wheelchairs exist in which the backrest can be rotated to be coplanar with the seat.

However, these prior art wheelchairs do not take into account patients whose lower body or even the whole body cannot move. In the course of the backrest of these prior art wheelchairs rotating from the upright position to the lying position, the lower body, and even the patient whose whole body is not moving, sitting on the wheelchair will slide off the wheelchair. This can lead to confusion and even injury to the patient as the caregiver operates the wheelchair.

In addition, there are wheelchairs in which the backrest, seat, first and second armrest portions, leg support portion and foot support portion of the wheelchair can be aligned in a common plane to form a mattress. The mattress converted from the wheelchair can be matched with the accommodating space of the bed frame, and the other part of the mattress forms the nursing bed.

However, at present, the wheelchair which can be replaced by the mattress has no lifting function. The wheelchair which can be combined with the bed frame has the lifting function, so that the height of the mattress can be adjusted, and the nursing personnel can take care of the patient in a labor-saving manner.

SUMMERY OF THE UTILITY MODEL

Therefore, the present invention is directed to a wheelchair that does not allow a patient to slide down when a backrest rotates from a standing position to a lying position. Furthermore, the wheelchair of the utility model can be converted into a mattress, has a lifting function and can be combined with a bed frame to form a nursing bed. The nursing staff can save labor and can be prevented from being injured.

A wheelchair in accordance with a preferred embodiment of the present invention includes a transport base, a seat, a backrest, a first actuator, a first linkage assembly, a first actuating member, and a first guide. The chair seat comprises a main chair frame and a sub-chair seat. The main chair frame is fixed on the transportation base. The sub-seat is arranged in the main seat frame and is pivoted to the main seat frame. The backrest is pivoted to the main chair frame. The first actuating device is fixed on the transportation base and is rotatably connected to the backrest. The backrest is capable of being actuated by a first actuation means to rotate relative to the seat between a raised position and a lying position. The first connecting rod combination is provided with a first connecting end and a second connecting end. The first connecting end of the first connecting rod combination is fixed on the backrest. The first actuating member is fixed to the sub-seat. The first actuating member has a first arcuate guide slot. The first arc-shaped guide groove is provided with a first upper endpoint, a first middle low point and a second upper endpoint. The first guide rod is fixed on the second connecting end of the first connecting rod combination and is inserted into the first arc-shaped guide groove of the first actuating member. When the backrest is in the upright position, the first guide bar is located at a first upper end of the first arcuate guide slot of the first actuating member and the main frame is coplanar with the sub-seat. During the process that the backrest is actuated by the first actuating device to rotate from the upright position to the lying position, the sub-seat is actuated by the first connecting rod combination and the first connecting rod to rotate upwards until the first connecting rod is positioned at the first middle low point of the first arc-shaped guide groove. The sub-seat is then driven downward until the first guide bar is located at the second upper end of the first arcuate guide slot. At this time, the main chair frame and the sub-chair seat are coplanar.

In one embodiment, the first actuating member may be fixed to the bottom surface of the sub-seat.

In another embodiment, the first actuating member may be fixed to the first side of the sub-seat.

Further, a wheelchair in accordance with a preferred embodiment of the present invention further includes a second linkage assembly, a second actuating member, and a second guide bar. The second connecting rod combination is provided with a third connecting end and a fourth connecting end. The third connecting end of the second connecting rod combination is fixed on the backrest. The second actuating member is fixed to a second side edge of the sub-seat. The second actuating member has a second arcuate guide slot. The second arcuate channel has a third upper end, a second intermediate lower end, and a fourth upper end. The second guide rod is fixed on the fourth connecting end of the second connecting rod combination and is inserted into the second arc-shaped guide groove of the second actuating member. When the backrest is in the upright position, the second guide bar is located at a third upper end of the second arcuate guide slot of the second actuating member and the main frame is coplanar with the sub-seat. During the process that the backrest is actuated by the first actuating device to rotate from the upright position to the lying position, the sub-seat is actuated by the second connecting rod combination and the second guide rod to rotate upwards until the second guide rod is positioned at the second middle low point of the second arc-shaped guide groove. The sub-seat is then driven downward until the second guide bar is located at the fourth upper end of the second arcuate guide slot. At this time, the main chair frame and the sub-chair seat are coplanar.

In one embodiment, the first link assembly includes a first link, a second link, and a third link. The first link has a first end and a second end. The first end of the first connecting rod is used as a first connecting end. The second link has a third end and a fourth end. The third end of the second connecting rod is pivoted with the second end of the first connecting rod. The third link has a fifth end and a sixth end. The fifth end of the third connecting rod is pivoted with the fourth end of the second connecting rod. The sixth tail end of the third connecting rod is used as a second connecting end.

In one embodiment, the second link assembly includes a fourth link, a fifth link and a sixth link. The fourth link has a seventh end and an eighth end. The seventh end of the fourth link is the third link. The fifth link has a ninth end and a tenth end. The ninth end of the fifth connecting rod is pivoted with the eighth end of the fourth connecting rod. The sixth link has an eleventh end and a twelfth end. The eleventh tail end of the sixth connecting rod is pivoted with the tenth tail end of the fifth connecting rod. The twelfth tail end of the sixth connecting rod is used as a fourth connecting end.

Further, a wheelchair in accordance with a preferred embodiment of the present invention further includes a first hand rest portion, a second hand rest portion, a leg support portion, a second actuator, and a foot support portion. The first armrest part is pivoted to the third side edge of the backrest. The second armrest is pivoted to the fourth side of the backrest. The leg support is pivotally connected to the main frame. The second actuator is fixed to the transport base and is rotatably connected to the leg support. The foot support is pivotally connected to the leg support. The leg support can be actuated by the second actuating device to rotate to be coplanar with the main frame. The first backrest part and the second backrest part can rotate to be coplanar with the backrest. The foot support portion is rotatable between a horizontal position and a vertical position relative to the leg support portion. The seat, the backrest, the first armrest part, the second armrest part, the leg support part and the foot support part can jointly form a mattress.

In one embodiment, after the leg support is coplanar with the main frame, the leg support can be actuated by the second actuator to rotate upward to a predetermined angle.

Further, in accordance with a preferred embodiment of the present invention, the wheelchair further comprises at least one third actuator. At least one third actuator is secured to the transport base and is coupled to the main frame. The main chair frame can be actuated by at least one third actuating device to lift and lower relative to the transportation base.

Further, a wheelchair according to a preferred embodiment of the present invention further includes a first guide frame and a second guide frame. The first guide frame is fixed below the fifth side of the main chair frame. The second guide frame is fixed below the sixth side of the main chair frame.

Different from the prior art, according to the utility model discloses a sub-seat support of its seat support of wheelchair can upwards rotate earlier and then rotate downwards at the back from sticking up the position and rotating to the position in-process of lying, causes can not let the disease gliding. The wheelchair of the utility model can be converted into a mattress, has the lifting function and can be combined with a bed frame to form a nursing bed. The nursing staff can save labor and can be prevented from being injured.

The advantages and spirit of the present invention can be further understood by the following detailed description and the accompanying drawings.

Drawings

FIG. 1 is an exterior view of a wheelchair in accordance with a preferred embodiment of the present invention;

FIG. 2 is a side view of the wheelchair 1 with some components removed according to the preferred embodiment of the present invention;

FIG. 3 is a side view of another side of a portion of the components of the structure shown in FIG. 2;

FIG. 4 is another side elevational view of a wheelchair with some elements removed in accordance with a preferred embodiment of the present invention;

FIG. 5 is a side view of another side of a portion of the components of the structure shown in FIG. 4;

figures 6 to 10 are side views of a wheelchair according to a preferred embodiment of the invention with parts of the components removed and with one of its essential components turned from the upright position to the lying position;

FIG. 11 is another side elevational view of a wheelchair with some elements removed in accordance with a preferred embodiment of the present invention;

FIG. 12 is a side elevational view of a portion of the components of a wheelchair in accordance with a preferred embodiment of the present invention;

figure 13 is another side elevational view of some of the elements of a wheelchair in accordance with a preferred embodiment of the present invention;

FIG. 14 is an exterior view of the wheelchair transformed into a mattress position in accordance with the preferred embodiment of the present invention;

FIG. 15 is an external view of the wheelchair and the bed frame to be combined according to the preferred embodiment of the present invention;

FIG. 16 is a side view of a wheelchair in a mattress position with the mattress not raised in accordance with a preferred embodiment of the present invention;

figure 17 is a side view of a wheelchair in a mattress position with the mattress raised in accordance with a preferred embodiment of the present invention;

figure 18 is a side view of a wheelchair in accordance with a preferred embodiment of the present invention with the bed frame engaged and the bed frame not raised;

figure 19 is a side view of a wheelchair with an integrated bed frame and the bed frame raised by the wheelchair according to a preferred embodiment of the invention.

The reference numbers illustrate:

1: wheelchair

10 transport base

11: seat base

112 main chair frame

1122 fifth side

1124 sixth side edge

114 sub-chair seat

1142 the first side edge

1144 second side edge

12, back support

122 the third side edge

124 the fourth side

13 first actuating device

14 first link combination

140 the first connection end

141 second connection end

142 the first connecting rod

1422 first end

1424 second end

144 second connecting rod

1442 third end

1444 fourth end

146 third connecting rod

1462 fifth end

1464 sixth end

15 first actuating member

152 first arc-shaped guide groove

1522 first upper endpoint

1524 first middle Low Point

1526 second upper endpoint

16 first guide rod

17 second connecting rod combination

170 the third connecting end

171 the fourth connecting end

172 fourth connecting rod

1722 seventh terminus

1724 eighth terminus

174 fifth connecting rod

1742 ninth end

1744 tenth end

176 sixth connecting rod

1762 eleventh Ending

1764 at the twelfth end

18 second actuating member

182 the second arc-shaped guide groove

1822 third Top end

1824 middle low point

1826 fourth upper endpoint

19 second guide rod

20 first armrest part

21 second arm rest

22: leg support

Second actuating device

24: foot support

25 third actuating device

26 first guide frame

27 second guide frame

3: bed frame

30, a containing space

302 opening (C)

32 foldable door frame

322 the first top rod

34 side frame

342 the second top rod

Detailed Description

Referring to fig. 1 to 14, skeleton views without covering cushions schematically show a wheelchair 1 and a bed frame 3 capable of being combined therewith according to a preferred embodiment of the present invention. Figure 1 is an external view of a wheelchair 1 according to a preferred embodiment of the present invention. Figure 2 is a side view of the wheelchair 1 with some elements removed according to the preferred embodiment of the present invention. Fig. 3 is a side view of another side of a portion of the elements of the structure shown in fig. 2. Figure 4 is another side view of the wheelchair 1 with some elements removed according to the preferred embodiment of the present invention. Fig. 5 is a side view of another side of a portion of the elements of the structure shown in fig. 4. Figures 6 to 10 are side views of the wheelchair 1 according to the preferred embodiment of the present invention with some elements removed and a backrest 12 of the essential elements rotated from the upright position to the lying position. Figure 11 is another side view of the wheelchair 1 with some elements removed according to the preferred embodiment of the present invention. Figure 12 is a side view of part of the elements of a wheelchair 1 according to a preferred embodiment of the invention. Figure 13 is another side view of part of the elements of a wheelchair 1 according to a preferred embodiment of the invention. Figure 14 is an external view of the wheelchair 1 according to the preferred embodiment of the present invention converted into a mattress state.

As shown in fig. 1 to 5, a wheelchair 1 according to a preferred embodiment of the present invention includes a transport base 10, a seat 11, a backrest 12, a first actuator 13, a first link assembly 14, a first actuating member 15, and a first guide bar 16.

The seat 11 includes a main frame 112 and a sub-seat 114. The main frame 112 is fixed to the transport base 10. The sub-seat 114 is disposed in the main frame 112 and pivotally connected to the main frame 112. The backrest 12 is pivotally connected to the main frame 112.

The first actuator 13 is fixed to the transport base 10 and is rotatably connected to the backrest 12. The backrest 12 is able to be actuated by first actuation means 13 in rotation with respect to the seat 11 between the upright position and the lying position.

The first link assembly 14 has a first connecting end 140 and a second connecting end 141. The first connecting end 140 of the first linkage assembly 14 is fixed to the backrest 12.

The first actuating member 15 is fixed to the sub-seat 114. The first actuating member 15 has a first arcuate guide slot 152. First arcuate channel 152 has a first upper end 1522, a first intermediate lower point 1524 and a second upper end 1526. The first guide bar 16 is fixed to the second connecting end 141 of the first link assembly 14 and inserted into the first arc-shaped guide groove 152 of the first actuating member 15.

As shown in fig. 2, when the backrest 12 is in the upright position, the first guide bar 16 is located at the first upper end point 1522 of the first arcuate guide slot 152 of the first actuating member 15, and the main frame 112 is coplanar with the sub-seat 114. As shown in fig. 6-10, during the rotation of the backrest 12 from the upright position to the lying position by the first actuator 13, the sub-seat 114 is actuated by the first linkage assembly 14 and the first link 16 to rotate upward until the first link 16 is located at the first middle low point 1524 of the first arcuate guide 152. Subsequently, the sub-seat 114 is driven downward until the first guide bar 16 is located at the second upper end 1526 of the first arcuate guide slot 152. At this time, the main frame 112 and the sub-seat 114 are coplanar.

In one embodiment, the sub-seat 114 may be a plate-like member. The first actuating member 15 may be fixed to the bottom surface of the sub-seat 114.

In another embodiment, the sub-seat 114 may be a plate-like member or a frame-like member. The first actuation member 15 may be secured to a first side 1142 of the child seat 114. The sub-seat 114 shown in fig. 1-5 is an example of a frame-like member.

Further, as shown in fig. 4 and 5, the wheelchair 1 according to the preferred embodiment of the present invention further includes a second link assembly 17, a second actuating member 18 and a second guide rod 19. The second link assembly 17 has a third connecting end 170 and a fourth connecting end 171. The third connecting end 170 of the second link assembly 17 is fixed to the backrest 12. Second actuating member 18 is secured to second side 1144 of child seat 114. The second actuating member 18 has a second arcuate guide slot 182. The second arcuate guide slot 182 has a third upper end point 1822, a second intermediate lower point 1824, and a fourth upper end point 1826. The second guide rod 19 is fixed to the fourth connecting end 171 of the second link assembly 17 and inserted into the second arc-shaped guide groove 182 of the second actuating member 18.

Likewise, when the back 12 is in the upright position, the second guide bar 19 is positioned at the third upper end 1822 of the second arcuate guide slot 182 of the second actuating member 18, and the main frame 112 is coplanar with the sub-seat 114. During the rotation of the backrest 12 from the upright position to the lying position, which is activated by the first actuator 13, the sub-seat 114 is activated by the second linkage assembly 17 and the second guide bar 19 to rotate upward until the second guide bar 19 is located at the second middle low point 1824 of the second curved guide slot 182. Subsequently, the sub-seat 114 is driven downward until the second guide bar 19 is located at the fourth upper end 1826 of the second curved guide slot 182. At this time, the main frame 112 and the sub-seat 114 are coplanar.

In one embodiment, as shown in fig. 3, the first link assembly 14 includes a first link 142, a second link 144, and a third link 146. The first link 142 has a first end 1422 and a second end 1424. The first end 1422 of the first link 142 serves as the first connection end 140. The second link 144 has a third end 1442 and a fourth end 1444. The third end 1442 of the second link 144 is pivotally connected to the second end 1424 of the first link 142. The third link 146 has a fifth end 1462 and a sixth end 1464. The fifth end 1462 of the third link 146 is pivotally connected to the fourth end 1444 of the second link 144. The sixth end 1464 of the third link 146 serves as the second connection end 141.

In one embodiment, as shown in fig. 5, the second link assembly 17 includes a fourth link 172, a fifth link 174 and a sixth link 176. The fourth link 172 has a seventh end 1722 and an eighth end 1724. The seventh end 1722 of the fourth link 172 serves as the third connection end 170. Fifth link 174 has a ninth end 1742 and a tenth end 1744. The ninth end 1742 of the fifth link 174 is pivotally coupled to the eighth end 1724 of the fourth link 172. Sixth link 176 has an eleventh end 1762 and a twelfth end 1764. An eleventh end 1762 of the sixth link 176 is pivotally connected to a tenth end 1744 of the fifth link 174. The twelfth end 1764 of the sixth link 176 serves as the fourth connection end 171.

Further, as shown in fig. 14, the wheelchair 1 according to the preferred embodiment of the present invention further includes a first hand rest portion 20, a second hand rest portion 21, a leg support portion 22, a second actuator 23, and a foot support portion 24. The first armrest portion 20 is pivotally coupled to a third side edge 122 of the backrest 12. The second armrest portion 21 is pivotally connected to the fourth side 124 of the backrest 12. The leg support portion 22 is pivotally coupled to the main frame 112. The second actuator 23 is fixed to the transport base 10 and is rotatably connected to the leg support 22. The foot support 24 is pivotally connected to the leg support 22. The leg support 22 can be actuated by the second actuator 23 to rotate to be coplanar with the main frame 112. The first and second armrest parts 20 and 21 can rotate to be coplanar with the backrest 12. As shown in fig. 12 and 13, the foot support portion 24 is rotatable relative to the leg support portion 22 between a horizontal position (shown in fig. 12) and a vertical position (shown in fig. 13). The seat 11, backrest 12, first and second armrest portions 20, 21, leg support portions 22 and foot support portions 24 can collectively comprise a mattress (as shown in fig. 14).

In one embodiment, as shown in FIG. 11, after the leg support 22 is coplanar with the main frame 112, the leg support 22 can be actuated by the second actuator 23 to rotate upward to a predetermined angle.

Further, as shown in fig. 1, the wheelchair 1 according to the preferred embodiment of the present invention further comprises at least one third actuator 25. At least one third actuator 25 is fixed to the transport base 10 and is connected to the main frame 112. The main frame 112 can be actuated by at least one third actuator 25 to be raised and lowered relative to the transport base 10. In the example shown in fig. 1, two third actuators 25 are fixed to the transport base 10.

Further, as shown in fig. 15, the wheelchair 1 according to the preferred embodiment of the present invention further includes a first guide frame 26 and a second guide frame 27. The first guide frame 26 is fixed under the fifth side 1122 of the main frame 112. The second guide frame 27 is fixed under the sixth side 1124 of the main frame 112. The wheelchair 1 according to a preferred embodiment of the present invention can be combined with a bed frame 3 to form a nursing bed. The elements of the bed frame 3 constitute the accommodation space 30. The bed frame 3 comprises a collapsible door frame 32 and a side frame 34 opposite the collapsible door frame 32. The collapsible door frame 32 can be collapsed horizontally to form the opening 302. The wheelchair 1 according to the present invention can be moved into the accommodation space 30 through the opening 302 formed by the collapsible mast 32 through the transport base 10. The bed frame 3 further comprises at least a first top bar 322 and at least a second top bar 342. At least one first top bar 322 is fixed to the collapsible door frame 32. When the collapsible door frame 32 is closed, the at least one first push rod 322 extends toward the accommodating space 30. At least one second push rod 342 is fixed to the side frame 34 and extends toward the accommodating space 30. At least one first top bar 322 corresponds to the first guide frame 26. At least one second push rod 342 corresponds to the second guide frame 27.

Please refer to fig. 16, 17, 18 and 19. As shown in fig. 16 and 17, the at least one third actuator 25 can lift the main frame 112, i.e. the wheelchair 1 can be lifted into a mattress. Figure 16 depicts in a side view the wheelchair 1 according to a preferred embodiment of the invention in a mattress-forming condition with the mattress not raised. Figure 17 depicts in side view the wheelchair 1 according to a preferred embodiment of the invention in a mattress-forming condition with the mattress raised.

As shown in fig. 10 and 11, when the wheelchair 1 according to the present invention is moved into the receiving space 30 of the bed frame 3, at least one first push rod 322 extends into the first guide frame 26, and at least one second push rod 342 extends into the second guide frame 27. When the at least one third actuator 25 is lifted into the wheeled chair 1 with mattress, the bed frame 3 is lifted with the wheeled chair 1 with mattress by means of the at least one first bar 322 extending into the first guide 26 and the at least one second bar 342 extending into the second guide 27. Figure 18 depicts in a side view the bed frame 3 incorporating the wheelchair 1 according to a preferred embodiment of the invention without the bed frame 3 being raised. Figure 19 depicts in a side view the bed frame 3 incorporating the wheelchair 1 according to a preferred embodiment of the invention and the bed frame 3 is raised by the wheelchair 1.

Through the above detailed description of the present invention, it can be clearly understood that the sub-seat of the wheelchair seat of the present invention can be rotated upward and then rotated downward in the process of rotating the backrest from the standing position to the lying position, so that the patient can not slide down. The wheelchair of the utility model can be converted into a mattress, has the lifting function and can be combined with a bed frame to form a nursing bed. The labor is saved for the nursing personnel, and the nursing personnel can be prevented from being injured.

The foregoing detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the invention to the particular embodiments disclosed. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The claims are thus to be accorded the broadest interpretation in view of the foregoing description so as to encompass all possible variations and equivalent arrangements.

Claims (10)

1. A wheelchair, comprising:

a transport base;

the seat comprises a main seat frame and a sub-seat, the main seat frame is fixed on the transportation base, and the sub-seat is arranged in the main seat frame and is pivoted to the main seat frame;

a backrest pivotally connected to the main frame;

first actuating means fixed to said transport base and rotatably connected to said backrest, wherein said backrest is capable of being actuated by said first actuating means to rotate between a cocked position and a lie-flat position relative to said seat;

the first connecting rod combination is provided with a first connecting end and a second connecting end, and the first connecting end of the first connecting rod combination is fixed on the backrest;

the first actuating component is fixed on the sub-seat, and is provided with a first arc-shaped guide groove which is provided with a first upper endpoint, a first middle low point and a second upper endpoint; and

the first guide rod is fixed on the second connecting end of the first connecting rod combination and is inserted into the first arc-shaped guide groove;

wherein when said backrest is in said upright position, said first guide is at said first upper end of said first arcuate channel and said main seat frame is coplanar with said sub-seat, during rotation of said backrest from said upright position to said lie-flat position actuated by said first actuator, said sub-seat is actuated by said first linkage combination and said first guide to rotate upwardly until said first guide is at said first intermediate lower point of said first arcuate channel, and then said sub-seat is driven downwardly until said first guide is at said second upper end of said first arcuate channel, at which time said main seat frame is coplanar with said sub-seat.

2. The wheelchair of claim 1 wherein the first actuation member is secured to a bottom surface of the sub-seat.

3. The wheelchair of claim 1 wherein said first actuating member is secured to said first side of said sub-seat.

4. The wheelchair of claim 3 further comprising:

the second connecting rod combination is provided with a third connecting end and a fourth connecting end, and the third connecting end of the second connecting rod combination is fixed on the backrest;

a second actuating member secured to a second side of the sub-seat, the second actuating member having a second arcuate guide slot with a third upper endpoint, a second middle lower endpoint, and a fourth upper endpoint; and

the second guide rod is fixed on the fourth connecting end of the second connecting rod combination and is inserted into the second arc-shaped guide groove;

wherein when said backrest is in said upright position, said second link is at said third upper end of said second arcuate slot and said main seat frame is coplanar with said sub-seat, during rotation of said backrest from said upright position to said lie-flat position actuated by said first actuator, said sub-seat is actuated by said second link combination and said second link to rotate upwardly until said second link is at said second middle low point of said second arcuate slot, whereupon said sub-seat is driven downwardly until said second link is at said fourth upper end of said second arcuate slot, whereupon said main seat frame is coplanar with said sub-seat.

5. The wheelchair of claim 4 wherein the first linkage assembly comprises:

the first connecting rod is provided with a first tail end and a second tail end, and the first tail end of the first connecting rod is used as the first connecting end;

a second link having a third end and a fourth end, the third end of the second link pivotally connected to the second end of the first link; and

the third connecting rod is provided with a fifth tail end and a sixth tail end, the fifth tail end of the third connecting rod is pivoted with the fourth tail end of the second connecting rod, and the sixth tail end of the third connecting rod is used as the second connecting end.

6. The wheelchair of claim 5 wherein the second linkage assembly comprises:

a fourth link having a seventh end and an eighth end, the seventh end of the fourth link being the third connection end;

a fifth link having a ninth end and a tenth end, the ninth end of the fifth link pivotally connected to the eighth end of the fourth link; and

a sixth link having an eleventh end and a twelfth end, the eleventh end of the sixth link being pivotally connected to the tenth end of the fifth link, the twelfth end of the sixth link being the fourth connecting end.

7. The wheelchair of claim 6 further comprising:

a first armrest part pivoted to a third side of the backrest;

a second armrest part pivoted to a fourth side of the backrest;

a leg support pivotally coupled to the main frame;

a second actuating device fixed to the transport base and rotatably connected to the leg support; and

a foot support pivotally connected to the leg support;

the leg supporting part can be actuated by the second actuating device to rotate to be coplanar with the main chair frame, the first hand rest part and the second hand rest part can rotate to be coplanar with the backrest, and the foot supporting part can rotate between a horizontal position and a vertical position relative to the leg supporting part.

8. The wheelchair of claim 7 wherein the leg support is actuatable by the second actuation device to rotate upward to a predetermined angle after the leg support is coplanar with the main frame.

9. The wheelchair of claim 7 further comprising:

and the at least one third actuating device is fixed on the transportation base and connected to the main chair frame, wherein the main chair frame can be actuated by the at least one third actuating device to ascend and descend relative to the transportation base.

10. The wheelchair of claim 9 further comprising:

the first guide frame is fixed below the fifth side of the main chair frame; and

and the second guide frame is fixed below the sixth side of the main chair frame.

Images