TWI768520B - Wheel chair - Google Patents

Abstract

The invention discloses a wheelchair including a seat, a backrest, a first linker, a second linker, a third linker, an actuating member and a guiding rod. The seat includes a main seat frame and a sub-seat. The sub-seat is disposed in the main seat frame and pivoted to the main seat frame. The actuating member is mounted on the sub-seat, and has an arc-shaped guiding groove. The arc-shaped guiding groove has a first upper end point, a middle lower point and a second upper end point. The guiding rod is mounted on the third linker, and inserted into the arc-shaped guiding groove. During the rotation of the backrest from an upright position to a lying position, the sub-seat is actuated by the first linker, the second linker, the third linker and the guiding rod to rotate upwards until the guiding rod moves from the first upper end point to the middle lower point of the arc-shaped guiding groove. Then, the sub-seat is actuated to rotate downwards until the guiding rod moves to the second upper end point of the arc-shaped guiding groove. At this time, the main seat frame and the sub-seat are coplanar.

Description

wheelchair

The present invention relates to a wheelchair and, in particular, to a wheelchair that does not allow the patient to slide down during the rotation of the backrest from the upright position to the lying position.

Existing wheelchairs have designs in which the backrest can be adjusted to the angle between the seat and the seat. There are even wheelchairs with backrests that can be rotated to be flush with the seat.

However, these prior art wheelchairs do not take into account patients who cannot move the lower body or even the whole body. During the rotation of the backrest of these prior art wheelchairs from the erected position to the flat-lying position, the patient sitting in the wheelchair with the lower body or even the whole body immobile may slip off the wheelchair. This can lead to difficulties for caregivers to operate the wheelchair, and can even result in patient injury.

In addition, existing wheelchairs have also been able to adjust the backrest, seat, first armrest, second armrest, leg support and foot support to be coplanar to form a mattress. The mattress converted from the wheelchair can match the accommodation space of the bed frame, and one can form a nursing bed.

However, up to now, the wheelchair that can be replaced with a mattress has not been seen to have the function of lifting and lowering. It has never been seen that a wheelchair that can be combined with the bed frame has the function of lifting and lowering, and then Adjust the height of mattresses so caregivers can care for patients with less effort.

Therefore, one technical problem to be solved by the present invention is to provide a wheelchair that does not allow the patient to slide down when the backrest is rotated from the upright position to the lying position. Further, the wheelchair according to the present invention can be converted into a mattress, has a lifting function, and can also be combined with a bed frame to form a nursing bed. It also saves the caregivers effort and avoids injury to the caregivers.

A wheelchair according to a preferred embodiment of the present invention includes a transport base, a seat, a backrest, a first actuating device, a first link assembly, a first actuating member, and a first guide rod. The seat includes a main seat frame and a sub seat. The main chair frame is fastened to the transport base. The sub-seat seat is arranged in the main seat frame and is pivotally connected to the main seat frame. The backrest is pivotally connected to the main seat frame. The first actuating device is fixed to the transport base and is rotatably connected to the backrest. The backrest is actuated by the first actuating means to rotate relative to the seat between an upright position and a reclining position. The first connecting rod assembly has a first connecting end and a second connecting end. The first connecting end of the first connecting rod assembly is fixed on the backrest. The first actuating member is fixed on the sub-seat seat. The first actuating member has a first arcuate guide groove. The first arc-shaped guide groove has a first upper end point, a first middle low point and a second upper end point. The first guide rod is fixed on the second connecting end of the first link assembly, and is inserted into the first arc guide groove of the first actuating member. When the backrest is in the upright position, the first guide rod is located at the first upper end point of the first arc-shaped guide groove of the first actuating member, and the main seat frame and the sub seat are coplanar and the included angle is 0 degrees. During the rotation of the backrest from the upright position to the reclining position actuated by the first actuating means, the sub-seat seat is actuated by the first link The combination and the first guide rod is actuated and then rotated upward until the first guide rod is located at the first middle low point of the first arc-shaped guide groove. Then, the sub-seat is driven downward until the first guide rod is located at the second upper end point of the first arc guide groove. At this time, the main seat frame and the sub-seat seat are coplanar and the included angle is 0 degrees.

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

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

Further, the wheelchair according to the preferred embodiment of the present invention further includes a second link assembly, a second actuating member and a second guide rod. The second connecting rod assembly has a third connecting end and a fourth connecting end. The third connecting end of the second link assembly is fixed on the backrest. The second actuating member is fixed on the second side edge of the sub-seat seat. The second actuating member has a second arcuate guide slot. The second arc-shaped guide groove has a third upper end point, a second middle low point and a fourth upper end point. The second guide rod is fixed on the fourth connecting end of the second link assembly, and is inserted into the second arc guide groove of the second actuating member. When the backrest is in the upright position, the second guide rod is located at the third upper end point of the second arc-shaped guide groove of the second actuating member, and the main seat frame and the sub seat are coplanar and the included angle is 0 degrees. During the rotation of the backrest from the upright position to the reclining position actuated by the first actuating device, the sub-seat seat is actuated by the second link combination and the second guide rod and then rotates upward until the second guide rod is located in the first At the second middle low point of the two arc-shaped guide grooves. Then, the sub-seat is driven downward until the second guide rod is located at the fourth upper end point of the second arc guide groove. At this time, the main seat frame and the sub-seat seat are coplanar and the included angle is 0 degrees.

In a specific 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 link is used as the first connection end. The second link has a third end and a fourth end. The third end of the second link is pivotally connected with the second end of the first link. The third link has a fifth end and a sixth end. The fifth end of the third link is pivotally connected with the fourth end of the second link. The sixth end of the third link is used as the second connecting end.

In an 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 used as the third connection end. The fifth link has a ninth end and a tenth end. The ninth end of the fifth link is pivotally connected with the eighth end of the fourth link. The sixth link has an eleventh end and a twelfth end. The eleventh end of the sixth link is pivotally connected with the tenth end of the fifth link. The twelfth end of the sixth link is used as the fourth connection end.

Further, the wheelchair according to 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 actuating device and a foot support portion. The first hand rest is pivotally connected to the third side of the backrest. The second handrest is pivotally connected to the fourth side of the backrest. The leg support is pivotally connected to the main seat frame. The second actuating device 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 and then rotated to be coplanar with the main seat frame and at an included angle of 180 degrees. The first hand rest and the second hand rest are rotatable and coplanar with the backrest, and the included angle is 0 degrees. The foot support is rotatable relative to the leg support between a horizontal position and a vertical position. Seat, backrest, first hand rest, second hand rest, leg support The support portion and the foot support portion can together form a mattress.

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

Further, the wheelchair according to a preferred embodiment of the present invention further includes at least one third actuating device. At least one third actuating device is fixed to the transport base and connected to the main seat frame. The main seat frame can be actuated by at least one third actuating device to be raised and lowered relative to the transport base.

Further, the 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 under the fifth side of the main chair frame. The second guide frame is fixed under the sixth side of the main seat frame.

Different from the prior art, the sub-seat of the chair seat of the wheelchair according to the present invention will first rotate upward and then downward during the process of rotating the backrest from the upright position to the lying position, so that the patient will not slide down. The wheelchair according to the present invention can also be converted into a mattress, has a lifting function, and can be combined with a bed frame to form a nursing bed. It also saves the caregivers effort and avoids injury to the caregivers.

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

1: Wheelchair

10: Transport base

11: Seat

112: Main Chair Frame

1122: Fifth side

1124: Sixth Side

114: Sub-chair seat

1142: First side

1144: Second Side

12: Backrest

122: Third side

124: Fourth side

13: First Actuator

14: The first link combination

140: The first connection end

141: The second connection end

142: The first link

1422: First End

1424: Second End

144: Second Link

1442: Third End

1444: Fourth End

146: Third Link

1462: Fifth End

1464: Sixth End

15: First actuating member

152: The first arc guide groove

1522: First upper endpoint

1524: First Intermediate Low

1526: Second upper endpoint

16: The first guide rod

17: Second link combination

170: The third connection end

171: Fourth connection terminal

172: Fourth Link

1722: Seventh End

1724: Eighth End

174: Fifth Link

1742: Ninth End

1744: Tenth End

176: Sixth Link

1762: Eleventh End

1764: Twelfth End

18: Second actuating member

182: The second arc guide groove

1822: Third Upper Endpoint

1824: Intermediate Low

1826: Fourth Upper Endpoint

19: Second guide rod

20: The first rely on the hands

21: The second hand

22: Leg Support

23: Second Actuator

24: Foot support

25: Third Actuator

26: The first guide frame

27: Second guide frame

3: bed frame

30: accommodating space

302: Opening

32: Foldable door frame

322: The first ejector

34: Side shelf

342: Second ejector

Fig. 1 is an external view of a wheelchair according to a preferred embodiment of the present invention Fig. 2 is a side view of the wheelchair 1 according to a preferred embodiment of the present invention after removing some elements; Fig. 3 is a side view of the other side of some elements of the structure shown in Fig. 2; Fig. 4 is a side view of Another side view of the wheelchair according to the preferred embodiment of the present invention after removing some components; FIG. 5 is a side view of the other side of the partial components of the structure shown in FIG. 4 ; FIGS. 6 to 10 are respectively based on The wheelchair of the preferred embodiment of the present invention is a side view of the wheelchair in different states after removing some components and one of its essential components-the backrest rotated from the upright position to the lying position; FIG. 11 is a preferred embodiment according to the present invention Another side view of the wheelchair after removing some components; FIG. 12 is a side view of some components of the wheelchair according to the preferred embodiment of the present invention; FIG. 13 is the wheelchair according to the preferred embodiment of the present invention. Another side view of some components; Fig. 14 is an external view of the wheelchair according to the preferred embodiment of the present invention converted into a mattress; Fig. 15 is the wheelchair according to the preferred embodiment of the present invention and its combination Figure 16 is a side view of the wheelchair according to a preferred embodiment of the present invention in a mattress state and the mattress is not raised; Figure 17 is a wheelchair according to a preferred embodiment of the present invention A side view of a mattress in a state with the mattress raised; FIG. 18 is a wheelchair and a combined bed frame according to a preferred embodiment of the present invention A side view without the bed frame raised; FIG. 19 is a side view of the wheelchair and the combined bed frame according to a preferred embodiment of the present invention with the bed frame raised by the wheelchair.

Please refer to FIG. 1 to FIG. 14 , which are skeleton views without padding schematically illustrating a wheelchair 1 and a bed frame 3 that can be combined with it according to a preferred embodiment of the present invention. FIG. 1 is an external view of a wheelchair 1 according to a preferred embodiment of the present invention. FIG. 2 is a side view of the wheelchair 1 according to the preferred embodiment of the present invention with some components removed. FIG. 3 is a side view of another side of some elements of the structure shown in FIG. 2 . FIG. 4 is another side view of the wheelchair 1 according to the preferred embodiment of the present invention with some components removed. FIG. 5 is a side view of another side of some elements of the structure shown in FIG. 4 . 6 to 10 are respectively side views of the wheelchair 1 according to the preferred embodiment of the present invention after some components are removed and one of its essential components - the backrest 12 is rotated from the erected position to the lying position in different states. FIG. 11 is another side view of the wheelchair 1 according to the preferred embodiment of the present invention with some components removed. FIG. 12 is a side view of some components of the wheelchair 1 according to the preferred embodiment of the present invention. FIG. 13 is another side view of some components of the wheelchair 1 according to the preferred embodiment of the present invention. FIG. 14 is an external view of the wheelchair 1 converted into a mattress state according to a preferred embodiment of the present invention.

As shown in FIGS. 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 actuating device 13 , a first link assembly 14 , a first The actuating member 15 and the first guide rod 16 .

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

The first actuating device 13 is fixed to the transport base 10 and is rotatably connected to the backrest 12 . The backrest 12 is actuated by the first actuating means 13 to rotate relative to the seat 11 between an upright position and a lying position.

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

The first actuating member 15 is fixed on the sub-seat 114 . The first actuating member 15 has a first arc-shaped guide groove 152 . The first arc-shaped guide groove 152 has a first upper end point 1522 , a first middle low point 1524 and a second upper end point 1526 . The first guide rod 16 is fixed on 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 rod 16 is located at the first upper end point 1522 of the first arc-shaped guide groove 152 of the first actuating member 15 , and the main seat frame 112 is connected to the The sub-seats 114 are coplanar and the included angle is 0 degrees. As shown in FIGS. 6 to 10 , when the backrest 12 is actuated by the first actuating device 13 to rotate from the upright position to the lying position, the sub-seat 114 is composed of the first link assembly 14 and the first guide rod 16 . Actuating and then rotating upward until the first guide rod 16 is located at the first middle low point 1524 of the first arc-shaped guide groove 152 . Subsequently, the sub-seat 114 is driven downward until the first guide rod 16 is located at the second upper end point 1526 of the first arc-shaped guide groove 152 . At this time, the main seat frame 112 and the sub seat 114 Coplanar and the included angle is 0 degrees.

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

In another specific embodiment, the sub-seat 114 may be a plate-shaped member or a frame-shaped member. The first actuating member 15 can be fixed on the first side edge 1142 of the sub-seat 114 . The sub-seat 114 shown in FIGS. 1 to 5 is an example of a frame-like member.

Further, as shown in FIG. 4 and FIG. 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 connecting rod 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 on the backrest 12 . The second actuating member 18 is fixed on the second side 1144 of the sub-seat 114 . The second actuating member 18 has a second arcuate guide slot 182 . The second arc-shaped guide groove 182 has a third upper end point 1822 , a second middle low point 1824 and a fourth upper end point 1826 . The second guide rod 19 is fixed on the fourth connecting end 171 of the second connecting rod assembly 17 and inserted into the second arc-shaped guide groove 182 of the second actuating member 18 .

Likewise, when the backrest 12 is in the upright position, the second guide rod 19 is located at the third upper end point 1822 of the second arcuate guide groove 182 of the second actuating member 18, and the main seat frame 112 is connected to the sub-chair. The seats 114 are coplanar and the included angle is 0 degrees. When the backrest 12 is actuated by the first actuating device 13 to rotate from the upright position to the lying position, the sub-seat 114 is actuated by the second link assembly 17 and the second guide rod 19 to rotate upward until the second The guide rod 19 is located in the second arc guide At the second intermediate low point 1824 of the slot 182 . Then, the sub-seat 114 is driven downward until the second guide rod 19 is located at the fourth upper end point 1826 of the second arc-shaped guide groove 182 . At this time, the main seat frame 112 and the sub seat 114 are coplanar and the included angle is 0 degrees.

In an 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 connecting 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 with 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 an 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 . The fifth link 174 has a ninth end 1742 and a tenth end 1744 . The ninth end 1742 of the fifth link 174 is pivotally connected with the eighth end 1724 of the fourth link 172 . The sixth link 176 has an eleventh end 1762 and a twelfth end 1764 . The eleventh end 1762 of the sixth link 176 is pivotally connected with the 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 Figure 14, according to the preferred embodiment of the present invention The wheelchair 1 of the embodiment further includes a first hand rest portion 20 , a second hand rest portion 21 , a leg support portion 22 , a second actuating device 23 and a foot support portion 24 . The first hand rest 20 is pivotally connected to the third side edge 122 of the backrest 12 . The second armrest portion 21 is pivotally connected to the fourth side edge 124 of the backrest 12 . The leg support portion 22 is pivotally connected to the main seat frame 112 . The second actuating device 23 is fixed to the transport base 10 and is rotatably connected to the leg support 22 . The foot support portion 24 is pivotally connected to the leg support portion 22 . The leg support portion 22 can be actuated by the second actuating device 23 to rotate to be coplanar with the main seat frame 112 and the included angle is 180 degrees. The first hand rest 20 and the second hand rest 21 are rotatable and coplanar with the backrest 12 and the included angle is 0 degrees. As shown in FIGS. 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 , the backrest 12 , the first armrest 20 , the second armrest 21 , the leg support 22 and the foot support 24 can together form a mattress (as shown in FIG. 14 ).

In a specific embodiment, as shown in FIG. 11 , after the leg support portion 22 is coplanar with the main seat frame 112 , the leg support portion 22 can be actuated by the second actuating device 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 includes at least one third actuating device 25 . At least one third actuating device 25 is fixed to the transport base 10 and connected to the main seat frame 112 . The main seat frame 112 can be actuated by at least one third actuating device 25 to move up and down relative to the transport base 10 . In the example shown in FIG. 1 , two third actuating devices 25 are fixed on the transport base 10 .

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

Please refer to Figure 16, Figure 17, Figure 18 and Figure 19. As shown in FIGS. 16 and 17 , at least one third actuating device 25 is capable of raising and lowering the main seat frame 112 , that is, the wheelchair 1 that can be raised and lowered into a mattress. Fig. 16 is a side view depicting the wheelchair 1 according to the preferred embodiment of the present invention in a mattress state with the mattress not raised. Figure 17 depicts a side view of the wheelchair 1 according to the preferred embodiment of the present invention in a mattress state with the mattress raised.

As shown in FIGS. 10 and 11 , when the wheelchair 1 according to the present invention is moved into the accommodating space 30 of the bed frame 3 , at least one first top rod 322 is extended into the first guide frame 26 , and at least one second top rod 342 is extended into the second guide frame 27 . When the at least one third actuating device 25 is lifted and lowered into the wheelchair 1 of the mattress, the bed frame 3 is At least one first top rod 322 of a guide frame 26 and at least one second top rod 342 extending into the second guide frame 27 move up and down with the wheelchair 1 of the mattress. Figure 18 depicts a side view of the bed frame 3 incorporating the wheelchair 1 according to the preferred embodiment of the present invention and the bed frame 3 is not raised. FIG. 19 depicts a side view of a bed frame 3 incorporating a wheelchair 1 according to a preferred embodiment of the present invention and the bed frame 3 being raised by the wheelchair 1 .

From the above detailed description of the present invention, it can be clearly understood that the sub-seat of the seat of the wheelchair according to the present invention will first rotate upward and then downward when the backrest is rotated from the upright position to the lying position, so as not to allow the Patient decline. The wheelchair according to the present invention can also be converted into a mattress, has a lifting function, and can be combined with a bed frame to form a nursing bed. It also saves the caregivers effort and avoids injury to the caregivers.

Through the detailed description of the preferred embodiments above, it is hoped that the features and spirit of the present invention can be described more clearly, rather than limiting the aspect of the present invention by the preferred embodiments disclosed above. On the contrary, the intention is to cover various modifications and equivalent arrangements within the scope of the claimed scope of the present invention. Therefore, the scope of the claims to which the present invention is claimed should be construed in the broadest sense in light of the foregoing description so as to encompass all possible modifications and equivalent arrangements.

1: Wheelchair 10: Transport base 11: Seat 112: Main Chair Frame 114: Sub-chair seat 1142: First side 12: Backrest 122: Third side 13: First Actuator 14: The first link combination 140: The first connection end 141: The second connection end 142: The first link 1422: First End 1424: Second End 144: Second Link 1442: Third End 1444: Fourth End 146: Third Link 1462: Fifth End 1464: Sixth End 15: First actuating member 152: The first arc guide groove 16: The first guide rod 20: The first rely on the hands 22: Leg Support 23: Second Actuator 24: Foot support 25: Third Actuator 26: The first guide frame 27: Second guide frame

Claims (10)

A wheelchair, comprising: a transport base; a seat, including a main seat frame and a sub-seat, the main frame is fixed on the transport base, the sub-seat is arranged in the main seat and is pivotally connected to the main seat frame; a backrest is pivotally connected to the main seat frame; a first actuating device is fixed on the transport base and rotatably connected to the backrest, wherein the backrest is Can be actuated by the first actuating device to rotate relative to the seat between an upright position and a lying position; a first link assembly has a first connection end and a second connection end, the first The first connecting end of a link assembly is fixed on the backrest; a first actuating member is fixed on the sub-seat, the first actuating member has a first arc-shaped guide groove, the first actuating member is An arc-shaped guide groove has a first upper end point, a first middle low point and a second upper end point; and a first guide rod is fixed on the second connecting end of the first link assembly and inserted into in the first arc-shaped guide groove; wherein when the backrest is in the upright position, the first guide rod is located at the first upper end of the first arc-shaped guide groove, and the main seat frame and the sub The seat is coplanar and the included angle is 0 degrees. During the process of the backrest being actuated by the first actuating device to rotate from the upright position to the lying position, the sub-seat is combined by the first link and the second seat. A guide rod is actuated and then rotated upward until the first guide rod is located at the first middle low point of the first arc-shaped guide groove, and then the sub-seat is driven downward until the first guide rod is located at the first middle low point of the first arc-shaped guide groove. an arc guide At the second upper end point, at this time, the main seat frame and the sub seat are coplanar and the included angle is 0 degrees. The wheelchair of claim 1, wherein the first actuating member is fixed on a bottom surface of the sub-seat. The wheelchair of claim 1, wherein the first actuating member is fixed on a first side of the sub-seat. The wheelchair according to claim 3, further comprising: a second link assembly having a third connecting end and a fourth connecting end, the third connecting end of the second link assembly being fixed on the backrest a second actuating member fixed on a second side edge of the sub-seat, the second actuating member has a second arc-shaped guide groove, the second arc-shaped guide groove has a third upper end point, a second middle low point and a fourth upper end point; and a second guide rod fixed on the fourth connecting end of the second link assembly and inserted into the second arc-shaped guide groove; wherein When the backrest is in the upright position, the second guide rod is located at the third upper end point of the second arc-shaped guide groove, and the main seat frame and the sub seat are coplanar and the included angle is 0 degrees, When 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 link combination and the second guide rod to rotate upward until the The second guide rod is located at the second middle low point of the second arc-shaped guide groove, and then the sub-seat is driven downward until the second guide rod is located at the fourth upper end of the second arc-shaped guide groove At this point, the main seat frame and the sub seat are coplanar and the included angle is 0 degrees. The wheelchair as claimed in claim 4, wherein the first link assembly comprises: a first link having a first end and a second end, and the first end of the first link is used as the first link a connecting end; a second link having a third end and a fourth end, the third end of the second link is pivotally connected with the second end of the first link; and a third The link has a fifth end and a sixth end, the fifth end of the third link is pivotally connected with the fourth end of the second link, and the sixth end of the third link is as the second connection end. The wheelchair of claim 5, wherein the second link assembly comprises: a fourth link having a seventh end and an eighth end, and the seventh end of the fourth link is the first three connecting ends; a fifth link having a ninth end and a tenth end, the ninth end of the fifth link is pivotally connected with the eighth end of the fourth link; and a sixth The connecting rod has an eleventh end and a twelfth end, the eleventh end of the sixth link is pivotally connected with the tenth end of the fifth link, and the first end of the sixth link The twelve ends are used as the fourth connection end. The wheelchair as claimed in claim 6, further comprising: a first hand rest, which is pivotally connected to a third side of the backrest; a second hand rest, which is pivotally connected to a fourth side of the backrest; a leg support pivotally connected to the main seat frame; a second actuating device fixed to the transport base and rotatably connected to the leg support; and A foot support part is pivotally connected to the leg support part; wherein the leg support part can be actuated by the second actuating device and then rotated to be coplanar with the main seat frame and at an included angle of 180 degrees; the first armrest The second hand rest is rotatable and coplanar with the backrest and the included angle is 0 degrees, and the foot support is rotatable relative to the leg support between a horizontal position and a vertical position. The wheelchair of claim 7, wherein after the leg support is coplanar with the main seat frame, the leg support can be actuated by the second actuating device to rotate upward to a predetermined angle. The wheelchair of claim 7, further comprising: at least one third actuating device fixed on the transport base and connected to the main seat frame, wherein the main seat frame can be driven by the at least one third The actuating device actuates to raise and lower relative to the transport base. The wheelchair according to claim 9, further comprising: a first guide frame fixed below a fifth side of the main seat frame; and a second guide frame fixed on a first guide frame of the main seat frame Below the six sides.

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