Dual-purpose transfer device for switching between wheelchair and flatcar

Abstract

The invention relates to a wheelchair and flatcar switching dual-purpose transfer device. The wheelchair and flatcar switching dual-purpose transfer device comprises a supporting seat, an air cylinder fixedly arranged on the supporting seat, an electric control mechanism fixedly arranged on the supporting seat, a sitting mechanism fixedly arranged on the air cylinder, linkage mechanisms symmetrically and fixedly arranged on the supporting seat and a supporting mechanism fixedly arranged on the supporting seat. The supporting mechanism comprises a first sliding groove fixedly formed in the supporting base, a second sliding groove fixedly formed in the supporting base, a first supporting plate arranged on the first sliding groove in a sliding mode, a second supporting plate arranged on the second sliding groove in a sliding mode, first racks symmetrically and fixedly arranged on the first supporting plate, and second racks symmetrically and fixedly arranged on the second supporting plate. The universal wheels are rotationally arranged on the first supporting plate and the second supporting plate; the problem that an existing wheelchair and flatcar switching dual-purpose transfer device is prone to toppling is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical care equipment, and in particular to a transfer device that can be used as a wheelchair or a flatbed truck. Background Art

[0002] A transfer device is a medical care equipment used to transfer patients. The transfer bed is large in size, and the flow of people in the hospital is large. It is not easy to pass through narrow areas such as corridors and elevators. Therefore, a transfer bed that can switch between wheelchairs and flat carts has appeared. However, the existing transfer device only rotates the wheelchair so that the patient can lie flat during switching, and the support mechanism and the moving mechanism of the wheelchair do not unfold to expand the support area during switching. The support mechanism and the moving mechanism can only support the middle part of the flat bed. The flat bed is easy to topple over when pushed, causing harm to the patient. Therefore, a transfer device that can switch between a wheelchair and a flat cart with stable support is needed. Summary of the invention

[0003] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0004] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a transfer device that can be used as a wheelchair and a flatbed cart, including a support seat, a cylinder fixedly arranged on the support seat, an electric control mechanism fixedly arranged on the support seat, a riding mechanism fixedly arranged on the cylinder, a linkage mechanism symmetrically fixedly arranged on the support seat, and a support mechanism fixedly arranged on the support seat; The support mechanism includes a first slide groove fixed on the support seat, a second slide groove fixed on the support seat, a first support plate slidably arranged on the first slide groove, a second support plate slidably arranged on the second slide groove, a first rack symmetrically fixed on the first support plate, a second rack symmetrically fixed on the second support plate, and a plurality of universal wheels rotatably arranged on the first support plate and the second support plate.

[0005] Specifically, the electric control mechanism includes a battery fixedly arranged on the support seat, an electric control board fixedly arranged on the battery, and a plurality of buttons fixedly arranged on the electric control board.

[0006] Specifically, the riding mechanism includes a first base fixed on the cylinder, a first rotating shaft rotatably arranged on the first base, a second base fixed on the first rotating shaft, a second rotating shaft rotatably arranged on the first base, a third base fixed on the second rotating shaft, an adjusting component fixed on the third base, a transmission component fixed on the first base, the second base and the third base, and a telescopic component fixed on the second base.

[0007] Specifically, the adjustment assembly includes a plurality of first limiting holes fixed on the third base, a third sliding groove fixed on the third base, a foot pedal slidably arranged on the third sliding groove, a first limiting block slidably arranged on the foot pedal, a second limiting block slidably arranged on the foot pedal, a first gear fixedly rotatably arranged on the foot pedal, a first spring with one end fixed on the first limiting block and the other end fixed on the foot pedal, a second spring with one end fixed on the second limiting block and the other end fixed on the foot pedal, and a third spring symmetrically arranged on the foot pedal.

[0008] Specifically, the telescopic assembly includes a limiting device symmetrically fixed on the second base, a fourth slide groove fixed on the second base, a first slider slidably arranged on the fourth slide groove, a third rack symmetrically fixed on the first slider, a second gear symmetrically fixed on the third base, a fifth slide groove fixed on the second base, a second slider slidably arranged on the fifth slide groove, a sixth slide groove fixed on the second base, a telescopic block slidably arranged on the sixth slide groove, an airbag fixed on the telescopic block, and a sixth spring with one end fixed on the first slider and the other end fixed on the second slider.

[0009] Specifically, the transmission assembly includes a third gear symmetrically fixed on the first rotating shaft, a fourth gear symmetrically fixed on the second rotating shaft, a first chain sleeved on the third gear and the fourth gear, a first winding shaft symmetrically rotated on the first base, a fifth gear fixed on the first winding shaft, a first torsion spring with one end fixed on the first winding shaft and the other end fixed on the first base, a second winding shaft symmetrically rotated on the first base, a sixth gear fixed on the second winding shaft, a first traction rope with one end fixed on the foot pedal and the other end wound around the first winding shaft, and a second traction rope with one end fixed on the second slider and the other end wound around the second winding shaft.

[0010] Specifically, the limiting device includes a second limiting hole fixed on the second base, a seventh gear rotatably arranged on the second base, a third limiting block slidably arranged on the second base, a fourth limiting block slidably arranged on the second base, a fourth spring with one end fixed on the third limiting block and the other end fixed on the second base, and a fifth spring with one end fixed on the fourth limiting block and the other end fixed on the second base.

[0011] Specifically, the linkage mechanism includes a support column fixed on the support seat, an eighth gear on the first rotating shaft, a fourth rack fixed on the support column, a fifth rack sleeved on the first rotating shaft, a ninth gear rotatably arranged on the support column, a tenth gear fixed on the ninth gear, an eleventh gear rotatably arranged on the support seat, a second chain sleeved on the tenth gear and the eleventh gear, a twelfth gear fixed on the eleventh gear, a thirteenth gear rotatably arranged on the support seat, a third chain sleeved on the twelfth gear and the thirteenth gear, a fourteenth gear fixed on the thirteenth gear, a fifteenth gear rotatably arranged on the support seat, and a sixteenth gear fixed on the fifteenth gear.

[0012] Specifically, the riding mechanism also includes an air cylinder rotatably mounted on the first support plate, a hose with one end fixed on the air cylinder and the other end fixed on the airbag, a handle fixed on the air cylinder, a bracket with one end fixed on the second base and the other end sleeved on the handle, and a plurality of guardrails fixed on the first base and the third base.

[0013] The beneficial effects of the present invention are: (1) By setting up a linkage mechanism, the rotation of the riding mechanism and the movement of the supporting mechanism are linked. When the riding mechanism rotates, the supporting mechanism will be driven to move, thereby increasing the supporting area and preventing tipping.

[0014] (2) The adjustment component and the telescopic component can automatically adapt to patients of different heights. When the limit device is released, the sixth spring pushes the first slider to move downward, the third rack drives the second gear to rotate, and the second gear drives the telescopic block to move upward to support the patient's head. At the same time, the longer the distance the foot pedal moves, the longer the distance the sixth spring is compressed, and the longer the distance the first slider moves, and finally the longer the distance the telescopic block extends. The function of automatically adapting to patients of different heights is realized, and it has good versatility.

[0015] (3) The bottom of the gas cylinder is rotatably arranged on the first support plate. When the second base rotates, the gas cylinder is squeezed to press the gas in the gas cylinder into the airbag to support the patient's head. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0017] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0018] In the attached picture: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 A top view of the present invention; Figure 3 for Figure 2 Partial line section of AA; Figure 4 for Figure 2 Linear section of the middle BB; Figure 5 for Figure 2 Partial line section of CC; Figure 6 for Figure 4 Partial line section of the middle DD; Figure 7 for Figure 4 Line section of EE in the middle; Figure 8 for Figure 2 Partial line section of the FF; Fig. 9 for Figure 2 Partial line section of GG. DETAILED DESCRIPTION

[0019] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0020] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0021] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0022] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0023] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] Reference Figure 1-9As shown, the transfer device for a wheelchair and a flatbed switchable dual-purpose transport device of the present invention comprises a support seat 1, a cylinder 2 fixedly arranged on the support seat, an electric control mechanism 3 fixedly arranged on the support seat, a riding mechanism 4 fixedly arranged on the cylinder, a linkage mechanism 5 symmetrically fixedly arranged on the support seat, and a supporting mechanism 6 fixedly arranged on the support seat; the cylinder is used to push the riding mechanism to rise, and switch to a flatbed during the rising process; the electric control mechanism is used to control the operation of the cylinder; the linkage mechanism is used to link the rotation of the riding mechanism and the movement of the supporting mechanism, and when the riding mechanism rotates, it will drive the supporting mechanism to move, thereby increasing the supporting area and avoiding tipping; The support mechanism includes a first slide groove 61 fixed on the support seat, a second slide groove 62 fixed on the support seat, a first support plate 63 slidably arranged on the first slide groove, a second support plate 64 slidably arranged on the second slide groove, a first rack 65 symmetrically fixed on the first support plate, a second rack 66 symmetrically fixed on the second support plate, and a plurality of universal wheels 67 rotatably arranged on the first support plate and the second support plate; the first support plate can slide on the first slide groove; the second support plate can slide on the second slide groove, and when the first support plate and the second support plate slide, the support area of ​​the bottom surface is increased to avoid tipping; the first rack and the second rack cooperate with the linkage mechanism, and when the riding mechanism rotates, the first rack and the second rack are driven to move through the linkage mechanism, thereby causing the first support plate and the second support plate to slide.

[0025] Specifically, the electric control mechanism includes a battery 31 fixed on a support seat, an electric control board 32 fixed on the battery, and a plurality of buttons 33 fixed on the electric control board; the battery is used to power the cylinder; the electric control board is used to control the operation of the cylinder; and the buttons are used to switch the status of the wheelchair and the flat car.

[0026] Specifically, the riding mechanism includes a first base 41 fixed on the cylinder, a first rotating shaft 42 rotatably arranged on the first base, a second base 43 fixed on the first rotating shaft, a second rotating shaft 44 rotatably arranged on the first base, a third base 45 fixed on the second rotating shaft, an adjusting component 46 fixed on the third base, a transmission component 47 fixed on the first base, the second base and the third base, and a telescopic component 48 fixed on the second base; cushions are provided on the first base, the second base and the third base to increase the comfort of the patient; when the second base rotates, it will drive the first rotating shaft to rotate together; the third base and the second rotating shaft will rotate together; the adjusting component can adapt to patients with different leg lengths, that is, it can adapt to patients of different heights, and has good versatility; the adjusting component moves, and drives the telescopic component to move through the transmission component; the telescopic component can extend out of the second base to support the patient's head.

[0027] Specifically, the adjustment assembly includes a plurality of first limiting holes 461 fixedly arranged on the third base, a third sliding groove 462 fixedly arranged on the third base, a foot pedal 463 slidably arranged on the third sliding groove, a first limiting block 464 slidably arranged on the foot pedal, a second limiting block 465 slidably arranged on the foot pedal, a first gear 466 fixedly and rotatably arranged on the foot pedal, a first spring 467 with one end fixedly arranged on the first limiting block and the other end fixedly arranged on the foot pedal, a second spring 468 with one end fixedly arranged on the second limiting block and the other end fixedly arranged on the foot pedal, and a third spring 469 symmetrically arranged on the foot pedal; both the first limiting block and the second limiting block are provided with inclined surfaces; the first limiting block and the second The limit block is provided with teeth, which mesh with the first gear; when the patient steps on the foot pedal, the foot pedal slides downward on the third slide groove, the third spring is stretched, and the first limit hole squeezes the first limit block and the second limit block, so that the first limit block and the second limit block slide into the foot pedal, and the first spring and the second spring are compressed. When moving to the appropriate position, the first spring and the second spring push the first limit block and the second limit block into the first limit hole to complete the limit. When resetting, press the first limit block to slide the first block, drive the first gear to rotate, and then drive the second limit block to slide, so that the first limit block and the second limit block enter the foot pedal, release the limit, and the third spring contracts to drive the foot pedal to move upward to complete the reset.

[0028] Specifically, the telescopic assembly includes a limiting device 481 symmetrically fixed on the second base, a fourth slide groove 482 fixed on the second base, a first slider 483 slidably arranged on the fourth slide groove, a third rack 484 symmetrically fixed on the first slider, a second gear 485 symmetrically fixed on the third base, a fifth slide groove 486 fixed on the second base, a second slider 487 slidably arranged on the fifth slide groove, a sixth slide groove 488 fixed on the second base, a telescopic block 489 slidably arranged on the sixth slide groove, an airbag 480 fixed on the telescopic block, and a sixth spring 4811 with one end fixed on the first slider and the other end fixed on the second slider; the third rack meshes with the second gear, and a rack is provided on the telescopic block to mesh with the second gear; the limiting device limits the first slider, and the first slider will not slide when in the wheelchair state; when the second base rotates, the limiting device will release the limit, and the first slider can slide; When the foot pedal moves downward, it will drive the second slider to move downward through the transmission component, so that the sixth spring is compressed. Since the limiting device limits the first slider at this time, the first slider will not move. When the limiting device releases the limit, the sixth spring pushes the first slider to move downward, the third rack drives the second gear to rotate, and the second gear drives the telescopic block to move upward to support the patient's head. At the same time, the longer the distance the foot pedal moves, the longer the distance the sixth spring is compressed, and then the longer the distance the first slider moves, and finally the longer the distance the telescopic block extends, realizing the function of automatically adapting to patients of different heights; the telescopic block has a certain weight. When the rotation angle of the second base is small, the component force along the sixth slide groove generated by the weight of the telescopic block is large, and the sixth spring cannot be driven. As the rotation angle increases, the component force along the sixth slide groove generated by the weight of the telescopic block gradually decreases, and the sixth spring can drive the telescopic block to move. When resetting, the telescopic block can be reset by its own gravity.

[0029] Specifically, the transmission assembly includes a third gear 471 symmetrically fixed on the first rotating shaft, a fourth gear 472 symmetrically fixed on the second rotating shaft, a first chain 473 sleeved on the third gear and the fourth gear, a first winding shaft 474 symmetrically rotatably arranged on the first base, a fifth gear 475 fixed on the first winding shaft, a first torsion spring 476 with one end fixed on the first winding shaft and the other end fixed on the first base, a second winding shaft 477 symmetrically rotatably arranged on the first base, a sixth gear 478 fixed on the second winding shaft, a first traction rope 479 with one end fixed on the foot pedal and the other end wound around the first winding shaft, and a A second traction rope 470, one end of which is fixed on the second slider and the other end of which is wound around the second winding shaft; when the first rotating shaft rotates, the third gear will drive the fourth gear to rotate through the first chain, so that the second base and the third base rotate and switch to the flat car state; the fifth gear and the sixth gear are meshed; the first traction rope is initially wound around the first winding shaft, and when the foot pedal moves downward, the first traction rope is pulled to drive the first winding shaft to rotate, thereby rotating the fifth gear and driving the sixth gear to rotate. The sixth gear is coaxial with the second winding shaft, so it will drive the second winding shaft to rotate, thereby driving the second traction rope to move, and the second traction rope pulls the second slider downward.

[0030] Specifically, the limiting device includes a second limiting hole 4811 fixed on the second base, a seventh gear 4812 rotatably arranged on the second base, a third limiting block 4813 slidably arranged on the second base, a fourth limiting block 4814 slidably arranged on the second base, a fourth spring 4815 with one end fixed on the third limiting block and the other end fixed on the second base, and a fifth spring 4816 with one end fixed on the fourth limiting block and the other end fixed on the second base; inclined surfaces are provided on both sides of the part of the third limiting block extending out of the second limiting block; an inclined surface is provided on the fourth limiting block; when the second base rotates, it will drive the limiting device to rotate together, and the third limiting block partially extends out of the second base, so it will contact the linkage mechanism on both sides when rotating, and the linkage mechanism squeezes the third limiting block to make the third limiting block slide inward, driving the seventh gear to rotate, and the seventh gear drives the fourth limiting block to move, thereby releasing the limit on the first slider, and the fourth spring and the fifth spring are used for resetting.

[0031] Specifically, the linkage mechanism includes a support column 61 fixed on the support seat, an eighth gear 62 on the first rotating shaft, a fourth rack 63 fixed on the support column, a fifth rack 64 sleeved on the first rotating shaft, a ninth gear 65 rotatably arranged on the support column, a tenth gear 66 fixed on the ninth gear, an eleventh gear 67 rotatably arranged on the support seat, a second chain 68 sleeved on the tenth gear and the eleventh gear, a twelfth gear 69 fixed on the eleventh gear, a thirteenth gear 60 rotatably arranged on the support seat, a third chain 611 sleeved on the twelfth gear and the thirteenth gear, a fourteenth gear 612 fixed on the thirteenth gear, a fifteenth gear 613 rotatably arranged on the support seat, and a sixteenth gear 614 fixed on the fifteenth gear; a hook is provided on one side of the support column, which can be used to hang an IV bottle; when the cylinder pushes the first When the base moves upward, the first rotating shaft moves upward together, and the eighth gear moves upward and rotates along the fourth rack, driving the first rotating shaft to rotate, and then driving the second base to rotate; in the process of the first rotating shaft moving upward, it will drive the fifth rack to move upward, and then drive the ninth gear to rotate. The ninth gear is coaxial with the tenth gear, so the tenth gear will also rotate, and drive the eleventh gear to rotate through the second chain. The eleventh gear is coaxial with the second gear, so it will drive the twelfth gear to rotate. The twenty-second gear drives the thirteenth gear to rotate through the third chain. The thirteenth gear is coaxial with the fourteenth gear. The rotation of the fourteenth gear drives the fifteenth gear to rotate. The fifteenth gear is coaxial with the sixteenth gear. The sixteenth gear drives the first rack and the second rack to move, and then the first support plate and the second support plate move, thereby increasing the support area while the second base and the third base rotate to avoid tipping.

[0032] Specifically, the riding mechanism also includes an air cylinder 49 rotatably mounted on the first support plate, a hose 40 with one end fixed on the air cylinder and the other end fixed on the airbag, a handle 411 fixed on the air cylinder, a bracket 412 with one end fixed on the second base and the other end sleeved on the handle, and a plurality of guardrails 413 fixed on the first base and the third base; the bottom of the air cylinder is rotatably mounted on the first support plate, and when the second base rotates, the air cylinder is squeezed to press the gas in the air cylinder into the airbag to support the patient's head.

[0033] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A transfer device that can be used as a wheelchair or a flatbed truck. Features: It comprises a support seat (1), a cylinder (2) fixedly mounted on the support seat, an electric control mechanism (3) fixedly mounted on the support seat, a riding mechanism (4) fixedly mounted on the cylinder, a linkage mechanism (5) symmetrically fixedly mounted on the support seat, and a supporting mechanism (6) fixedly mounted on the support seat; The support mechanism comprises a first slide groove (61) fixedly arranged on the support seat, a second slide groove (62) fixedly arranged on the support seat, a first support plate (63) slidably arranged on the first slide groove, a second support plate (64) slidably arranged on the second slide groove, a first rack (65) symmetrically fixedly arranged on the first support plate, a second rack (66) symmetrically fixedly arranged on the second support plate, and a plurality of universal wheels (67) rotatably arranged on the first support plate and the second support plate.

2. A transfer device capable of switching between a wheelchair and a flatbed cart according to claim 1, Features: The electric control mechanism comprises a battery (31) fixedly mounted on a support seat, an electric control board (32) fixedly mounted on the battery, and a plurality of buttons (33) fixedly mounted on the electric control board.

3. A transfer device capable of switching between a wheelchair and a flatbed cart according to claim 1, Features: The riding mechanism comprises a first base (41) fixedly mounted on the cylinder, a first rotating shaft (42) rotatably mounted on the first base, a second base (43) fixedly mounted on the first rotating shaft, a second rotating shaft (44) rotatably mounted on the first base, a third base (45) fixedly mounted on the second rotating shaft, an adjusting component (46) fixedly mounted on the third base, a transmission component (47) fixedly mounted on the first base, the second base and the third base, and a telescopic component (48) fixedly mounted on the second base.

4. A transfer device capable of switching between a wheelchair and a flatbed cart according to claim 3, Features: The adjustment component includes a plurality of first limiting holes (461) fixedly arranged on the third base, a third sliding groove (462) fixedly arranged on the third base, a foot pedal (463) slidably arranged on the third sliding groove, a first limiting block (464) slidably arranged on the foot pedal, a second limiting block (465) slidably arranged on the foot pedal, a first gear (466) fixedly rotatably arranged on the foot pedal, a first spring (467) having one end fixedly arranged on the first limiting block and the other end fixedly arranged on the foot pedal, a second spring (468) having one end fixedly arranged on the second limiting block and the other end fixedly arranged on the foot pedal, and a third spring (469) symmetrically arranged on the foot pedal.

5. A transfer device capable of switching between a wheelchair and a flatbed cart according to claim 4, Features: The telescopic assembly includes a limit device (481) symmetrically fixed on the second base, a fourth slide groove (482) fixed on the second base, a first slider (483) slidably arranged on the fourth slide groove, a third rack (484) symmetrically fixed on the first slider, a second gear (485) symmetrically fixed on the third base, a fifth slide groove (486) fixed on the second base, a second slider (487) slidably arranged on the fifth slide groove, a sixth slide groove (488) fixed on the second base, a telescopic block (489) slidably arranged on the sixth slide groove, an airbag (480) fixed on the telescopic block, and a sixth spring (4811) one end of which is fixed on the first slider and the other end of which is fixed on the second slider.

6. A transfer device capable of switching between a wheelchair and a flatbed cart according to claim 5, Features: The transmission component comprises a third gear (471) symmetrically fixed on the first rotating shaft, a fourth gear (472) symmetrically fixed on the second rotating shaft, a first chain (473) sleeved on the third gear and the fourth gear, a first winding shaft (474) symmetrically rotatably arranged on the first base, a fifth gear (475) fixed on the first winding shaft, a first torsion spring (476) with one end fixed on the first winding shaft and the other end fixed on the first base, a second winding shaft (477) symmetrically rotatably arranged on the first base, a sixth gear (478) fixed on the second winding shaft, a first traction rope (479) with one end fixed on the foot pedal and the other end wound around the first winding shaft, and a second traction rope (470) with one end fixed on the second slider and the other end wound around the second winding shaft.

7. A transfer device capable of switching between a wheelchair and a flatbed cart according to claim 5, Features: The limiting device includes a second limiting hole (4811) fixedly arranged on the second base, a seventh gear (4812) rotatably arranged on the second base, a third limiting block (4813) slidably arranged on the second base, a fourth limiting block (4814) slidably arranged on the second base, a fourth spring (4815) with one end fixedly arranged on the third limiting block and the other end fixedly arranged on the second base, and a fifth spring (4816) with one end fixedly arranged on the fourth limiting block and the other end fixedly arranged on the second base.

8. A transfer device capable of switching between a wheelchair and a flatbed cart according to claim 3, Features: The linkage mechanism comprises a support column (61) fixed on the support seat, an eighth gear (62) on the first rotating shaft, a fourth rack (63) fixed on the support column, a fifth rack (64) sleeved on the first rotating shaft, a ninth gear (65) rotatably arranged on the support column, a tenth gear (66) fixed on the ninth gear, an eleventh gear (67) rotatably arranged on the support seat, a second chain (68) sleeved on the tenth gear and the eleventh gear, a twelfth gear (69) fixed on the eleventh gear, a thirteenth gear (60) rotatably arranged on the support seat, a third chain (611) sleeved on the twelfth gear and the thirteenth gear, a fourteenth gear (612) fixed on the thirteenth gear, a fifteenth gear (613) rotatably arranged on the support seat, and a sixteenth gear (614) fixed on the fifteenth gear.

9. A transfer device capable of switching between a wheelchair and a flatbed cart according to claim 5, Features: The riding mechanism also includes an air cylinder (49) rotatably mounted on the first support plate, a hose (40) with one end fixedly mounted on the air cylinder and the other end fixedly mounted on the air bag, a handle (411) fixedly mounted on the air cylinder, a bracket (412) with one end fixedly mounted on the second base and the other end sleeved on the handle, and a plurality of guardrails (413) fixedly mounted on the first base and the third base.

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