A multifunctional electric wheelchair bed

Abstract

The present invention relates to the technical field of medical devices, and specifically discloses a multifunctional electric wheelchair bed, which includes a backrest assembly, a seat frame assembly, a leg plate assembly, and a footrest assembly that are sequentially hinged. Armrest mechanisms are symmetrically arranged on both sides of the seat frame assembly. An installation frame is provided at the bottom of the seat frame assembly, and drive wheels and driven wheels are installed on the installation frame. A first electric cylinder is installed at the bottom of the seat frame assembly for simultaneously folding or unfolding the wheelchair bed and storing the armrest assembly. It also includes a lifting diagonal brace assembly composed of a third electric cylinder, a scissor lift with a carrier at the top, a center adjustment shaft installed on the carrier, an alignment frame, a fourth electric cylinder, and a fifth electric cylinder. The third electric cylinder is used for folding or unfolding the scissor lift to adjust the height of the wheelchair bed. The fourth electric cylinder is used for controlling the deflection of the seat frame assembly in the vertical plane. The fifth electric cylinder is used for driving the wheelchair bed to rotate when the wheelchair bed is unfolded; anti-tipping wheels are used to jointly support the remaining components with the drive wheels and the driven wheels.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a multifunctional electric wheelchair bed. Background Art

[0002] An electric wheelchair bed is an auxiliary device for the elderly or users with limited mobility to sit, lie down or move around. It is of great significance for improving the self-care ability of the elderly and those with limited mobility and enhancing the quality of life of users and their families.

[0003] However, the traditional electric wheelchair bed has a simple structure and single function. It can only realize the functions of moving, sitting and lying, and adjusting the sitting or lying posture of the user. Such electric wheelchair beds are mainly suitable for moving on flat ground. When the user needs to go up and down slopes, the center of gravity of the wheelchair bed shifts on the slope, which is likely to cause the wheelchair bed to overturn. The safety and reliability of the wheelchair bed during use are poor. During the folding or unfolding process of the traditional electric wheelchair bed, the armrests are likely to catch the user's clothes or press the user's limbs, thus triggering safety accidents, and there are potential safety threats in the daily use of the wheelchair bed. The backrest board and the leg board of the traditional wheelchair bed are controlled by different mechanisms. During the folding or unfolding process of the wheelchair bed, they need to be adjusted separately, and the process of adjusting the form of the wheelchair bed is relatively complex, which is not conducive to improving the folding or unfolding efficiency of the wheelchair bed. Summary of the Invention

[0004] Based on this, in view of the technical problems of the single function, poor use safety and low form adjustment efficiency of the wheelchair bed, it is necessary to provide a multifunctional electric wheelchair bed.

[0005] A multifunctional electric wheelchair bed includes a backrest assembly, a seat frame assembly, a leg board assembly and a footrest assembly which are sequentially hinged to form a sitting and lying surface. Armrest mechanisms are symmetrically arranged on both sides of the seat frame assembly. An installation frame is arranged at the bottom of the seat frame assembly, and a driving wheel and a driven wheel are installed on the installation frame. A first electric cylinder hinged to the backrest assembly is installed at the bottom of the seat frame assembly. A backrest support rod is hinged to the side of the backrest assembly facing away from the sitting and lying surface, and the end of the backrest support rod is hinged to a connecting rod. A pull rod hinged to the connecting rod is hinged to the leg board assembly, and a second electric cylinder is installed. A push rod hinged to the second electric cylinder is hinged to the footrest assembly.

[0006] The armrest mechanism includes a limit frame, an armrest connecting rod and a crank which are sequentially hinged. The limit frame is hinged to the backrest assembly, and an armrest that can rotate in a vertical plane and a plane perpendicular to the vertical plane is installed therein. The end of the crank far from the armrest connecting rod is hinged to the seat frame assembly.

[0007] The first electric cylinder extends and retracts to drive the backrest assembly to rotate, thereby sequentially driving the backrest support rod, the connecting rod, the pull rod, the leg plate assembly, and the seat frame assembly to rotate relative to the backrest assembly to fold or unfold the wheelchair bed; when the first electric cylinder extends and retracts, the limit frame, the armrest connecting rod, and the crank are received or unfolded under the combined action of the backrest assembly and the seat frame assembly;

[0008] It further includes a lifting diagonal brace assembly composed of a third electric cylinder, a scissor lift with a support frame at the top, a center adjustment shaft rotatably installed on the support frame, an alignment frame, a fourth electric cylinder, and a fifth electric cylinder. The third electric cylinder is received at the bottom of the mounting frame and is hinge-connected to the scissor lift to fold or unfold the scissor lift to adjust the horizontal height of the wheelchair bed. The alignment frame is respectively rotatably connected to the center adjustment shaft and the seat frame assembly, and is provided with a transmission rod hinge-connected to the crank. The fourth electric cylinder is adjacent to the connection between the seat frame assembly and the backrest assembly and is hinge-connected to the alignment frame. The output end of the fourth electric cylinder is hinge-connected to the mounting frame to drive the alignment frame and the seat frame assembly to deflect in the vertical plane. The fifth electric cylinder is arranged on the alignment frame and is hinge-connected to the seat frame assembly to drive the wheelchair bed to rotate when the wheelchair bed is unfolded;

[0009] And anti-tipping wheels, which are used to jointly support the remaining components with the drive wheels and the driven wheels.

[0010] In one embodiment, the limit frame includes a first wing plate and a second wing plate arranged at an angle. A limit block is rotatably arranged on the first wing plate. The armrest is hinge-connected to the limit block and swings within the limit space formed by the first wing plate and the second wing plate.

[0011] In one embodiment, the armrest mechanism further includes a connecting piece. A card slot matched with the connecting piece is opened on one side of the limit frame adjacent to the backrest assembly. The connecting piece is clamped in the card slot and is respectively hinge-connected to the backrest assembly and the armrest connecting rod.

[0012] In one embodiment, the drive wheel includes a power input shaft driven by a drive motor, a power output shaft engaged with the power input shaft, and a wheel coaxially rotating with the power output shaft. A stepped hole is formed at one end of the power input shaft away from the power output shaft. A thrust bearing positioning threaded ring threadedly connected to the inner surface of the power input shaft is disposed in the stepped hole. A pressing shaft screw threadedly engaged with the thrust bearing positioning threaded ring is inserted through the thrust bearing positioning threaded ring. A thrust bearing abutted against the inner surface of the stepped hole is mounted at one end of the pressing shaft screw in the stepped hole. The thrust bearing is mounted on the pressing shaft screw through a locking nut. The pressing shaft screw is configured to push the power input shaft to be connected with the power output shaft or pull the power input shaft away from the power output shaft through the thrust bearing positioning threaded ring under an external force.

[0013] In one embodiment, a reinforcing member is mounted on the outer surface of the power output shaft. A shock-absorbing spring is disposed on the reinforcing member and connected to the bottom of the mounting bracket.

[0014] In one embodiment, an operation panel with a plurality of buttons is disposed on the outer side surface of the armrest for controlling the operation of each electric cylinder and the drive motor.

[0015] In one embodiment, the scissor lift member includes a lifting rod and a support rod group symmetrically disposed on both sides of the lifting rod. The support rod group includes a support member composed of two cross-arranged and hinge-connected support rods or a plurality of the support members hinge-connected. The middle part of the lifting rod is hinge-connected to the output end of the third electric cylinder.

[0016] In one embodiment, the backrest assembly, the seat frame assembly, the leg plate assembly, and the footrest assembly respectively include a skeleton and a support plate. Each support plate is correspondingly mounted on the corresponding skeleton and is respectively provided with a plurality of ventilation holes.

[0017] In one embodiment, a soft pad is respectively disposed on each support plate.

[0018] In one embodiment, a pusher is disposed on one side of the backrest assembly facing away from the sitting / lying surface.

[0019] For the multifunctional electric wheelchair bed implementing the present invention, through the telescoping of the first electric cylinder, the wheelchair bed can be folded or unfolded to realize the sitting and lying functions of the wheelchair bed; when the wheelchair bed is unfolded, by extending the second electric cylinder and the fifth electric cylinder, the bed surface of the unfolded wheelchair bed can be tilted in the vertical plane so that the user can get up in the lying position; by the telescoping of the fourth electric cylinder, the included angle between the seat frame assembly and the backrest assembly can be adjusted to facilitate adjusting the overall center of gravity of the wheelchair bed during the process of the user going up and down slopes, ensuring the stability and safety of the wheelchair bed during driving. The wheelchair bed integrates multiple functions, which is beneficial to improving the user experience and the market competitiveness of the product;

[0020] Since the backrest assembly, the seat frame assembly, the leg plate assembly, the pull rod, the connecting rod and the backrest support rod are sequentially hinged to form a closed loop, and the backrest assembly is also sequentially connected to the limit frame, the armrest connecting rod, the crank and the seat frame assembly to form a closed loop. Thus, by only controlling the telescoping of the first electric cylinder, the folding or unfolding of the wheelchair bed and the storage of the armrests can be realized simultaneously. While avoiding the armrests from catching the user's clothes and improving the safety of using the wheelchair bed, the process of adjusting the form of the wheelchair bed is greatly simplified, and the folding or unfolding efficiency of the wheelchair bed is improved. Brief Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the multifunctional electric wheelchair bed in an embodiment of the present invention;

[0022] Figure 2 It is a rear view of the multifunctional electric wheelchair bed in an embodiment of the present invention;

[0023] Figure 3 It is a schematic structural diagram of the multifunctional electric wheelchair bed in the folded state in an embodiment of the present invention;

[0024] Figure 4 It is a schematic structural diagram of the multifunctional electric wheelchair bed in the incompletely unfolded state in an embodiment of the present invention;

[0025] Figure 5 It is a schematic structural diagram of the multifunctional electric wheelchair bed in the unfolded state in an embodiment of the present invention;

[0026] Figure 6 It is a position relationship diagram of the lifting diagonal brace assembly and the mounting bracket in an embodiment of the present invention;

[0027] Figure 7 It is a schematic structural diagram of the multifunctional electric wheelchair bed in the most suitable state on flat ground in an embodiment of the present invention;

[0028] Figure 8 It is a schematic structural diagram of the multifunctional electric wheelchair bed in the downhill state in an embodiment of the present invention;

[0029] Figure 9 Schematic structural diagram of the multifunctional electric wheelchair bed in the uphill state in an embodiment of the present invention;

[0030] Figure 10 Schematic structural diagram of the multifunctional electric wheelchair bed in the ascending state in an embodiment of the present invention;

[0031] Figure 11 Schematic structural diagram of the multifunctional electric wheelchair bed in the sitting-up state in an embodiment of the present invention;

[0032] Figure 12 Schematic diagram of the positional relationship between the limit frame and the armrest in one state in an embodiment of the present invention;

[0033] Figure 13 Schematic diagram of the positional relationship between the limit frame and the armrest in another state in an embodiment of the present invention;

[0034] Figure 14 For Figure 1 Partial enlarged schematic structural diagram of part A in the illustrated embodiment;

[0035] Figure 15 Schematic structural diagram of the drive wheel in an embodiment of the present invention;

[0036] Figure 16 For Figure 15 Schematic cross-sectional structure diagram in the B-B direction in the illustrated embodiment. Detailed implementation manners

[0037] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0038] Please refer to together Figures 1 to 11, the present invention provides a multifunctional electric wheelchair bed 10, which includes a backrest assembly 100, a seat frame assembly 200, a leg plate assembly 300, and a footrest assembly 400 that are sequentially hinged and form a sitting and lying surface. Armrest mechanisms 500 are symmetrically arranged on both sides of the seat frame assembly 200. An installation frame 600 is provided at the bottom of the seat frame assembly 200. A driving wheel 610 and a driven wheel 620 are installed on the installation frame 600. A first electric cylinder 210 hinged to the backrest assembly 100 is installed at the bottom of the seat frame assembly 200. A backrest support rod 110 is hinged on the side of the backrest assembly 100 facing away from the sitting and lying surface. The end of the backrest support rod 110 is hinged to a connecting rod 120; a pull rod 310 hinged to the connecting rod 120 is hinged on the leg plate assembly 300, and a second electric cylinder 320 is installed. A push rod 410 hinged to the second electric cylinder 320 is hinged on the footrest assembly 400; the armrest mechanism 500 includes a limit frame 510, an armrest connecting rod 520, and a crank 530 that are sequentially hinged. The limit frame 510 is hinged to the backrest assembly 100, and an armrest 540 that can rotate in a vertical plane and a plane perpendicular to the vertical plane is installed therein. One end of the crank 530 away from the armrest connecting rod 520 is hinged to the seat frame assembly 200. The first electric cylinder 210 expands and contracts to drive the backrest assembly 100 to rotate, and then sequentially drives the backrest support rod 110, the connecting rod 120, the pull rod 310, the leg plate assembly 300, and the seat frame assembly 200 to rotate relative to the backrest assembly 100 to fold or unfold the wheelchair bed 10; when the first electric cylinder 210 expands and contracts, the limit frame 510, the armrest connecting rod 520, and the crank 530 are received or unfolded under the combined action of the backrest assembly 100 and the seat frame assembly 200.

[0039] The multifunctional electric wheelchair bed 10 further includes a lifting diagonal brace assembly 700 composed of a third electric cylinder 710, a scissor lift 730 with a carrier 720 at the top, a central adjustment shaft 740 rotatably installed on the carrier 720, an alignment frame 750, a fourth electric cylinder 760, and a fifth electric cylinder 770. The third electric cylinder 710 is received at the bottom of the installation frame 600 and is hinged to the scissor lift 730 for folding or unfolding the scissor lift 730 to adjust the horizontal height of the wheelchair bed 10. The alignment frame 750 is respectively rotatably connected to the central adjustment shaft 740 and the seat frame assembly 200, and is provided with a transmission rod 751 hinged to the crank 530. The fourth electric cylinder 760 is adjacent to the connection between the seat frame assembly 200 and the backrest assembly 100 and is hinged to the alignment frame 750. The output end of the fourth electric cylinder 760 is hinged to the installation frame 600 for driving the alignment frame 750 and the seat frame assembly 200 to deflect in a vertical plane. The fifth electric cylinder 770 is arranged on the alignment frame 750 and is hinged to the seat frame assembly 200 for driving the wheelchair bed 10 to rotate when the wheelchair bed 10 is unfolded; and an anti-tipping wheel 800 for jointly supporting the remaining components with the driving wheel 610 and the driven wheel 620.

[0040] Implementing the multifunctional electric wheelchair bed 10 of the present invention, through the telescoping of the first electric cylinder 210, the wheelchair bed 10 can be folded or unfolded, realizing the sitting and lying functions of the wheelchair bed 10; when the wheelchair bed 10 is unfolded, by extending the second electric cylinder 320 and the fifth electric cylinder 770, the bed surface of the unfolded wheelchair bed 10 can be inclined in the vertical plane so that the user can get up in the lying position; by adjusting the angle between the seat frame assembly 200 and the backrest assembly 100 through the telescoping of the fourth electric cylinder 760, it is convenient to adjust the overall center of gravity of the wheelchair bed 10 during the process of the user going up and down slopes, ensuring the stability and safety of the wheelchair bed 10 during driving. The wheelchair bed 10 integrates multiple functions, which is beneficial to improving the user experience and the market competitiveness of the product; since the backrest assembly 100, the seat frame assembly 200, the leg plate assembly 300, the pull rod 310, the connecting rod 120 and the backrest support rod 110 are sequentially hinged and form a closed loop, and the backrest assembly 100 is also sequentially connected to the limit frame 510, the armrest connecting rod 520, the crank 530 and the seat frame assembly 200 and form a closed loop. In this way, by only controlling the telescoping of the first electric cylinder 210, the folding or unfolding of the wheelchair bed 10 and the storage of the armrest 540 can be achieved simultaneously. While avoiding the armrest 540 from catching the user's clothes and improving the safety of using the wheelchair bed 10, the process of adjusting the form of the wheelchair bed 10 is greatly simplified, and the folding or unfolding efficiency of the wheelchair bed 10 is improved.

[0041] The first electric cylinder 210 expands and contracts to fold or unfold the wheelchair bed 10, and to store or unfold the armrest mechanism 500. It should be noted that the elongation or contraction of the electric cylinder disclosed in the present invention means that, under the action of power drive, the piston rod at the output end of the electric cylinder elongates or shortens. There is no other possible interpretation here. The movement of other electric cylinders later should refer to this interpretation and will not be elaborated here. Specifically, when the first electric cylinder 210 elongates, it will push the backrest assembly 100 to deflect towards the seat frame assembly 200. At the same time, the backrest support rod 110 on the backrest assembly 100 will drive the connecting rod 120 and the pull rod 310 to rotate, and then drive the leg plate assembly 300 to deflect towards the seat frame assembly 200. In this way, the wheelchair bed 10 folds and provides a seat for the user. During this process, the quadrilateral formed by the backrest assembly 100, the limit frame 510, the armrest connecting rod 520 and the crank 530 deforms under the traction of the backrest assembly 100. The armrest connecting rod 520 will deflect towards the seat frame assembly 200, thereby raising the horizontal height of the armrest 540, lifting the armrest 540 from the side of the seat frame assembly 200, and realizing the unfolding of the armrest 540. When the first electric cylinder 210 contracts, it will pull the backrest assembly 100 to deflect away from the seat frame assembly 200. At the same time, the backrest support rod 110 on the backrest assembly 100 will drive the connecting rod 120 and the pull rod 310 to rotate, and then drive the leg plate assembly 300 to deflect away from the seat frame assembly 200 until the backrest assembly 100, the seat frame assembly 200 and the leg plate assembly 300 are in the same plane, that is, the wheelchair bed 10 is unfolded. Correspondingly, during this process, the armrest connecting rod 520 will deflect away from the seat frame assembly 200 and pull down the armrest 540, so that the armrest 540 is stored on the side of the seat frame assembly 200. In this way, by only controlling the first electric cylinder 210, the folding or unfolding of the wheelchair bed 10 and the storage of the armrest 540 can be realized simultaneously, simplifying the process of the morphological transformation of the wheelchair bed 10 and improving the adjustment efficiency of the wheelchair bed 10.

[0042] The second electric cylinder 320 is used to separately control the folding and unfolding of the footrest assembly 400, so as to facilitate the user to step on or increase the lying area of the wheelchair bed 10, facilitate the user to flex and extend the legs in the lying state, and improve the comfort of using the wheelchair bed 10. Specifically, when the second electric cylinder 320 elongates after being energized, the output end of the second electric cylinder 320 acts on the push rod 410 with a deflecting thrust, so that the footrest assembly 400 deflects towards the lying surface side of the leg plate assembly 300, realizing the folding of the footrest assembly 400; when the second electric cylinder 320 contracts, the output end of the second electric cylinder 320 acts on the push rod 410 with a deflecting pulling force, causing the footrest assembly 400 to deflect towards the opposite side of the lying surface, thereby realizing the unfolding of the footrest assembly 400.

[0043] Please refer to Figure 12 and Figure 13, In one embodiment, the limiting frame 510 includes a first wing plate 511 and a second wing plate 512 arranged at an angle. A limiting block 513 is rotatably provided on the first wing plate 511. The armrest 540 is hinged to the limiting block 513 and swings within the limiting space 514 formed by the first wing plate 511 and the second wing plate 512. It can be understood that the armrest 540 swings within the plane where the first wing plate 511 is located driven by the limiting block 513. At the same time, the armrest 540 is also restricted by the limiting block 513 and swings within the limiting space 514 formed by the first wing plate 511 and the second wing plate 512. Its swinging range is determined by the angle between the first wing plate 511 and the second wing plate 512. In this way, the user can adjust the angle of the armrest 540 in the vertical plane according to their own needs. Before storing the armrest 540, the user can also push the armrest 540 in the direction away from the seat frame assembly 200 to prevent the armrest 540 from catching the user's clothes during the process of storing the armrest 540 towards the lower side of the seat frame assembly 200 and avoid accidents. It should be noted that in actual production, anti-slip patterns can be set at the connection between the limiting block 513 and the armrest 540 or interference fit can be used to increase the damping between the limiting block 513 and the armrest 540, so as to prevent the problem that the armrest 540 swings downward under the action of its own gravity after being lifted, thereby improving the reliability of the angle adjustment operation of the armrest 540.

[0044] Please refer further to Figure 13 and Figure 14 , In one embodiment, the armrest mechanism 500 further includes a connecting member 550. A card slot 515 for cooperating with the connecting member 550 is formed on one side of the limiting frame 510 adjacent to the backrest assembly 100. The connecting member 550 is clamped in the card slot 515 and is respectively hinged to the backrest assembly 100 and the armrest link 520. It can be understood that the limiting frame 510 is hinged to the backrest assembly 100 and the armrest link 520 through the connecting member 550. In this way, when the limiting frame 510 or the armrest 540 is damaged, only the limiting frame 510 needs to be removed from the connecting member 550, and then it can be replaced, which simplifies the maintenance operation of the wheelchair bed 10 and improves the maintenance efficiency of the wheelchair bed 10.

[0045] The third electric cylinder 710 is used to control the deployment or storage of the scissor lifting member 730 to adjust the horizontal height of the top of the scissor lifting member 730. In this way, the centering frame 750 rotatably connected to the central adjustment shaft 740 at the top of the scissor lifting member 730 will drive the seat frame assembly 200 to lift or lower to adjust the horizontal height of the sitting and lying surface of the wheelchair bed 10. In this way, when the user sits or lies on the wheelchair bed 10, the user only needs to control the third electric cylinder 710 to adjust the height of the wheelchair bed 10, which is convenient for taking items at high or low positions or for the user to stand up from the bed, so as to improve the convenience of using the wheelchair bed 10.

[0046] In one embodiment, the scissor lift 730 includes a lifting rod 731 and a support rod group symmetrically arranged on both sides of the lifting rod 731. The support rod group includes a support member composed of two support rods 732 arranged crosswise and hingedly connected, or a plurality of support members connected by hinges. The middle of the lifting rod 731 is hingedly connected to the output end of the third electric cylinder 710. Specifically, please refer to Figure 10 , when the third electric cylinder 710 extends, the output end of the third electric cylinder 710 upwardly lifts the lifting rod 731 and pushes the lifting rod 731 away from the cylinder body of the third electric cylinder 710. In this case, the lifting rod 731 synchronously pulls the support rod 732 to move, causing the support rod 732 to deform, and the horizontal height of the top of the support rod 732 rises, thereby lifting the horizontal height of the carrier 720 connected to the support rod 732 and the seat frame assembly 200 connected to the support rod 732 through the carrier 720 and the centering frame 750, so as to facilitate lifting the sitting and lying height of the user. Similarly, when the third electric cylinder 710 contracts, the output end of the third electric cylinder 710 pulls the lifting rod 731. At this time, the lifting rod 731 is subjected to a vertically downward pulling force and a horizontally pulling force, and pulls the support rod 732 to deform, causing the horizontal height of the top of the support rod 732 to decrease, and further reducing the horizontal height of the seat frame assembly 200 to meet the needs of the user.

[0047] The fourth electric cylinder 760 is used to drive the centering frame 750 to deflect in the vertical plane, thereby adjusting the angle between the seat frame assembly 200 and the backrest assembly 100, so as to adjust the overall center of gravity of the wheelchair bed 10 when the user is going up and down slopes on the wheelchair bed 10. Please refer to Figures 7 to 9 together. When the user uses the wheelchair bed 10 on a flat ground, that is, when the wheelchair bed 10 is in a folded state, the user controls the fourth electric cylinder 760 to contract. In this way, the cylinder body of the fourth electric cylinder 760 approaches the bottom of the mounting bracket 600 under the reaction force of the mounting bracket 600. At the same time, the hinged part of the centering frame 750 with the fourth electric cylinder 760 will deflect in the direction close to the bottom of the mounting bracket 600. During this process, the connection part of the seat frame assembly 200 with the leg plate assembly 300 is lifted, thereby reducing the angle between the seat frame assembly 200 and the backrest assembly 100. In this way, when the user sits on the wheelchair bed 10, the user's back can fully rely on the backrest assembly 100, thus avoiding the problem of muscle soreness caused by the user sitting upright for a long time and improving the comfort of using the wheelchair bed 10.

[0048] Similarly, when the user rides the wheelchair bed 10 and travels downward along the slope, the contraction amount of the fourth electric cylinder 760 can be further increased on the basis of traveling on flat ground. In other words, the included angle between the seat frame assembly 200 and the backrest assembly 100 is further reduced. In this way, when the user leans on the backrest assembly 100, the center of gravity of the user moves backward. That is to say, the center of gravity of the whole composed of the wheelchair bed 10 and the user moves backward, so as to avoid the wheelchair bed 10 from tipping forward during the downhill process and further injuring the user, thereby improving the safety of using the wheelchair bed 10.

[0049] Furthermore, when the user rides the wheelchair bed 10 and travels upward along the slope, that is, when going uphill, the user can control the fourth electric cylinder 760 to extend. In this way, the cylinder body of the fourth electric cylinder 760 moves away from the bottom of the lower mounting bracket 600 under the reaction force of the mounting bracket 600, and pushes the articulated part of the centering frame 750 with the fourth electric cylinder 760 to deflect in the direction away from the bottom of the mounting bracket 600. During this process, the horizontal height of the connection between the seat frame assembly 200 and the leg plate assembly 300 decreases, thereby increasing the included angle between the seat frame assembly 200 and the backrest assembly 100. In this way, when the user sits on the wheelchair bed 10, the center of gravity of the user tilts forward to balance the problem of the center of gravity of the wheelchair bed 10 moving backward. In this way, the problem of the user being injured due to the wheelchair bed 10 tipping backward during the uphill process can be avoided, thereby improving the safety of using the wheelchair bed 10.

[0050] The fifth electric cylinder 770 is used to rotate the wheelchair bed 10 under the condition that the wheelchair bed 10 is unfolded and the footrest assembly 400 is lifted, so as to facilitate the user to stand up straight in the lying position. Specifically, when the user needs to stand up straight, the user can control the fifth electric cylinder 770 to extend. In this way, the fifth electric cylinder 770 will push the seat frame assembly 200, so that the seat frame assembly 200 together with the backrest assembly 100, the leg plate assembly 300 and the footrest assembly 400 deflect together in the vertical direction, so that one end of the backrest assembly 100 is lifted and one end of the footrest assembly 400 is lowered, so as to facilitate the user to stand up straight. In this way, when an older user sits on the wheelchair for a long time, the user can stand up straight by adjusting the fifth electric cylinder 770, avoiding blood vessel compression in the legs caused by sitting for a long time and reducing the difficulty of standing up. It should be noted that in this case, the wheelchair bed 10 is in an inclined state, so an anti-tipping wheel 800 is arranged on the side of the drive wheel 610 far away from the driven wheel 620 to reduce the overall center of gravity of the wheelchair bed 10 and avoid the user from tipping over due to unstable center of gravity during the process of standing up straight, so as to improve the safety of using the wheelchair bed 10.

[0051] Please refer to Figure 10, in one embodiment, an operation panel 541 with multiple buttons is provided on the outer side of the armrest 540 for controlling the operation of each electric cylinder and the drive motor 611. In this way, the user only needs to adjust the buttons on the operation panel 541 to control and adjust the corresponding electric cylinder, so as to reduce the operation difficulty of the wheelchair bed 10. Of course, in actual production, a touch screen can also be used to replace the control panel to achieve the intelligent control of the wheelchair bed 10.

[0052] Please refer to Figure 15 and Figure 16 , in one embodiment, the drive wheel 610 includes a power input shaft 612 driven by the drive motor 611, a power output shaft 613 engaged with the power input shaft 612, and a wheel 614 coaxially rotating with the power output shaft 613. A stepped hole 615 is provided at one end of the power input shaft 612 far from the power output shaft 613. A thrust bearing positioning threaded ring 616 threadedly connected to the inner surface of the power input shaft 612 is arranged in the stepped hole 615. A pressing shaft screw 617 screwed with the thrust bearing positioning threaded ring 616 is penetrated through the thrust bearing positioning threaded ring 616. A thrust bearing 618 abutted against the inner surface of the stepped hole 615 is installed at one end of the pressing shaft screw 617 located in the stepped hole 615. The thrust bearing 618 is installed on the pressing shaft screw 617 through a locking nut 619. The pressing shaft screw 617 is used to push the power input shaft 612 to connect with the power output shaft 613 or pull the power input shaft 612 away from the power output shaft 613 under the action of an external force through the thrust bearing positioning threaded ring 616. Specifically, during the use of the wheelchair bed 10, the pressing shaft screw 617 can be tightened. In this way, the pressing shaft screw 617 will squeeze the thrust bearing 618 through the thrust bearing positioning threaded ring 616, so that the power input shaft 612 moves towards the power output shaft 613, so as to transfer the kinetic energy of the drive motor 611 to the power output shaft 613, and then drive the wheel 614 to roll, realizing the electric drive of the wheelchair bed 10. When the power storage device of the wheelchair bed 10, such as the battery in the battery, has insufficient power or other failures, the pressing shaft screw 617 can be loosened. In this way, the locking nut 619 moves towards the edge of the stepped hole 615 and squeezes the thrust bearing 618 and the thrust bearing positioning threaded ring 616 under the drive of the pressing shaft screw 617, so that the power output shaft 613 moves away from the power output shaft 613 until the two are disconnected. In this way, the power output shaft 613 and the wheel 614 are not controlled by the drive motor 611, so as to realize the manual control mode of the wheelchair bed 10.

[0053] In one embodiment, a reinforcement member 630 is mounted on the outer surface of the power output shaft 613. A shock-absorbing spring 631 is provided on the reinforcement member 630 and is connected to the bottom of the mounting bracket 600. By providing the reinforcement member 630, the contact area between the drive wheel 610 and the mounting bracket 600 is increased. That is to say, the connection strength between the drive wheel 610 and the mounting bracket 600 is improved, preventing the drive wheel 610 from detaching from the mounting bracket 600 and ensuring the reliability of the wheelchair bed 10 during use. In addition, during the movement of the wheelchair bed 10, when the drive wheel 610 travels on uneven ground, the tremors generated by the drive wheel 610 due to the ground effect can be partially absorbed by the shock-absorbing spring 631, thereby reducing the mechanical energy transmitted to the mounting bracket 600. That is to say, the jitter amplitude of the wheelchair bed 10 is reduced, facilitating the improvement of the comfort of the user's sitting and lying.

[0054] In one embodiment, a pusher 130 is provided on the side of the backrest assembly 100 facing away from the sitting and lying surface. By providing the pusher 130 on the backrest assembly 100, when the wheelchair bed 10 enters the manual control mode or during going uphill and downhill, others can hold the pusher 130 to facilitate the movement of the wheelchair bed 10.

[0055] In one embodiment, the backrest assembly 100, the seat frame assembly 200, the leg plate assembly 300, and the footrest assembly 400 each include a skeleton and a support plate. Each support plate is correspondingly mounted on the corresponding skeleton and is respectively provided with a plurality of ventilation holes. By providing ventilation holes in the support plate, it is possible to avoid the problem that the sweat generated by the user is difficult to evaporate in time due to the long-term contact between the user's body and the support plate, causing discomfort to the user's body. In addition, the ventilation holes can also serve as weight-reducing holes, reducing the overall weight of the wheelchair bed 10 while ensuring the strength of the support plate and reducing the transfer difficulty of the wheelchair bed 10. In another embodiment, soft pads are respectively provided on each support plate. By providing the soft pads, the contact area between the user and the support plate is increased, which is beneficial to improving the comfort of the user's sitting and lying.

[0056] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0057] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A multi-functional electric wheelchair bed (10), comprising a backrest assembly (100), a seat frame assembly (200), a leg plate assembly (300) and a footrest assembly (400) which are sequentially hinged and form a sitting and lying surface. Armrest mechanisms (500) are symmetrically arranged on both sides of the seat frame assembly (200). An installation frame (600) is arranged at the bottom of the seat frame assembly (200), and a driving wheel (610) and a driven wheel (620) are installed on the installation frame (600). Characterized in that, A first electric cylinder (210) hinged to the backrest assembly (100) is installed at the bottom of the seat frame assembly (200). A backrest support rod (110) is hinged to the side of the backrest assembly (100) facing away from the sitting and lying surface, and the end of the backrest support rod (110) is hinged to a connecting rod (120); A pull rod (310) hinged to the connecting rod (120) is hinged to the leg plate assembly (300), and a second electric cylinder (320) is installed. A push rod (410) hinged to the second electric cylinder (320) is hinged to the footrest assembly (400); The armrest mechanism (500) comprises a limit frame (510), an armrest connecting rod (520) and a crank (530) which are sequentially hinged. The limit frame (510) is hinged to the backrest assembly (100), and an armrest (540) capable of rotating in a vertical plane and a plane perpendicular to the vertical plane is installed therein. One end of the crank (530) far from the armrest connecting rod (520) is hinged to the seat frame assembly (200); The first electric cylinder (210) expands and contracts to drive the backrest assembly (100) to rotate, and then sequentially drives the backrest support rod (110), the connecting rod (120), the pull rod (310), the leg plate assembly (300) and the seat frame assembly (200) to rotate relative to the backrest assembly (100) to fold or unfold the wheelchair bed (10); When the first electric cylinder (210) expands and contracts, the limit frame (510), the armrest connecting rod (520) and the crank (530) are received or unfolded under the combined action of the backrest assembly (100) and the seat frame assembly (200); When the second electric cylinder (320) is energized and extends, the output end of the second electric cylinder (320) acts on the push rod (410) with a deflecting thrust to deflect the footrest assembly (400) to the side of the sitting and lying surface of the leg plate assembly (300) to realize the folding of the footrest assembly (400); When the second electric cylinder (320) contracts, the output end of the second electric cylinder (320) acts on the push rod (410) with a deflecting pull force to deflect the footrest assembly (400) to the side opposite to the sitting and lying surface, thereby realizing the unfolding of the footrest assembly (400); It further includes a lifting diagonal brace assembly (700) composed of a third electric cylinder (710), a scissor lift (730) with a support frame (720) provided at the top, a center adjustment shaft (740) rotatably mounted on the support frame (720), an alignment frame (750), a fourth electric cylinder (760), and a fifth electric cylinder (770). The third electric cylinder (710) is received at the bottom of the mounting frame (600) and is hinged to the scissor lift (730) for folding or unfolding the scissor lift (730) to adjust the horizontal height of the wheelchair bed (10). The alignment frame (750) is respectively rotatably connected to the center adjustment shaft (740) and the seat frame assembly (200), and is provided with a transmission rod (751) hinged to the crank (530). The fourth electric cylinder (760) is adjacent to the connection between the seat frame assembly (200) and the backrest assembly (100) and is hinged to the alignment frame (750). The output end of the fourth electric cylinder (760) is hinged to the mounting frame (600) for driving the alignment frame (750) and the seat frame assembly (200) to deflect in the vertical plane. The fifth electric cylinder (770) is disposed on the alignment frame (750) and is hinged to the seat frame assembly (200) for driving the wheelchair bed (10) to rotate when the wheelchair bed (10) is unfolded; when the user needs to stand up straight, the fifth electric cylinder (770) is controlled to extend, and the fifth electric cylinder (770) will push up the seat frame assembly (200), so that the seat frame assembly (200) together with the backrest assembly (100), the leg plate assembly (300), and the footrest assembly (400) jointly deflect in the vertical direction, so that one end of the backrest assembly (100) is lifted and one end of the footrest assembly (400) is lowered to facilitate the user to stand up straight; and anti-tip wheels (800) for jointly supporting the remaining components with the drive wheels (610) and the driven wheels (620); The armrest mechanism (500) further includes a connecting member (550). A card slot (515) adapted to the connecting member (550) is formed on one side of the limit frame (510) adjacent to the backrest assembly (100). The connecting member (550) is clamped in the card slot (515) and is respectively hinged to the backrest assembly (100) and the armrest link (520); The driving wheel (610) includes a power input shaft (612) driven by a driving motor (611), a power output shaft (613) engaged with the power input shaft (612), and a wheel (614) coaxially rotating with the power output shaft (613). One end of the power input shaft (612) away from the power output shaft (613) is provided with a stepped hole (615). A thrust bearing positioning threaded ring (616) threadedly connected to the inner surface of the power input shaft (612) is arranged in the stepped hole (615). A pressing shaft screw (617) screwed to the thrust bearing positioning threaded ring (616) penetrates through the thrust bearing positioning threaded ring (616). A thrust bearing (618) abutted against the inner surface of the stepped hole (615) is installed at one end of the pressing shaft screw (617) located in the stepped hole (615). The thrust bearing (618) is installed on the pressing shaft screw (617) through a locking nut (619). The pressing shaft screw (617) is used to push the power input shaft (612) to be connected to the power output shaft (613) or pull the power input shaft (612) away from the power output shaft (613) through the thrust bearing positioning threaded ring (616) under the action of an external force; During the use of the wheelchair bed, the pressing shaft screw (617) can be tightened. The pressing shaft screw (617) squeezes the thrust bearing (618) through the thrust bearing positioning threaded ring (616), so that the power input shaft (612) moves towards the power output shaft (613), in order to transfer the kinetic energy of the driving motor (611) to the power output shaft (613), and then drive the wheel (614) to roll, realizing the electric drive of the wheelchair bed; when the power storage device of the wheelchair bed has insufficient power or fails, the pressing shaft screw (617) can be loosened. The locking nut (619) moves towards the edge of the stepped hole (615) and squeezes the thrust bearing (618) and the thrust bearing positioning threaded ring (616) under the drive of the pressing shaft screw (617), so that the power input shaft (612) moves away from the power output shaft (613) until the two are disconnected, and the power output shaft (613) and the wheel (614) are not controlled by the driving motor (611), in order to realize the manual control mode of the wheelchair bed.

2. The multifunctional electric wheelchair bed (10) according to claim 1, characterized in that the limiting frame (510) includes a first wing plate (511) and a second wing plate (512) arranged at an angle. A limiting block (513) is rotatably arranged on the first wing plate (511). The armrest (540) is hingedly connected to the limiting block (513) and swings in a limiting space (514) formed by the first wing plate (511) and the second wing plate (512).

3. The multifunctional electric wheelchair bed (10) according to claim 1, characterized in that a reinforcing member (630) is installed on the outer surface of the power output shaft (613). A shock-absorbing spring (631) is arranged on the reinforcing member (630) and is connected to the bottom of the mounting frame (600).

4. The multi-functional electric wheelchair bed (10) according to claim 1, characterized in that, an operation panel (541) with a plurality of buttons is arranged on the outer side of the armrest (540) for controlling the operation of each electric cylinder and the drive motor (611).

5. The multi-functional electric wheelchair bed (10) according to claim 1, characterized in that, the scissor lift member (730) includes a lifting rod (731) and a support rod group symmetrically arranged on both sides of the lifting rod (731). The support rod group includes a support member composed of two support rods (732) arranged in a cross shape and hinged, or a plurality of the support members hinged. The middle part of the lifting rod (731) is hinged to the output end of the third electric cylinder (710).

6. The multi-functional electric wheelchair bed (10) according to any one of claims 1 to 5, characterized in that, the backrest assembly (100), the seat frame assembly (200), the leg plate assembly (300) and the footrest assembly (400) respectively include a skeleton and a support plate. Each support plate is correspondingly installed on the corresponding skeleton and is respectively provided with a plurality of ventilation holes.

7. The multi-functional electric wheelchair bed (10) according to claim 6, characterized in that, soft pads are respectively arranged on each support plate.

8. The multi-functional electric wheelchair bed (10) according to claim 7, characterized in that, a pusher (130) is arranged on the side of the backrest assembly (100) facing away from the sitting and lying surface.

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