Bed board and electric bed

Abstract

The present application discloses a bed board and an electric bed, wherein the bed board includes a back board, a seat board and a leg board arranged in sequence, and the back board, the seat board and the leg board are movably connected through a linkage structure, and the linkage structure drives the seat board to move and sink in a direction perpendicular to the plane where the seat board is located, drives the back board to tilt up at one end away from the seat board, and drives the leg board to tilt up at one end away from the seat board. By setting a suitable linkage structure, when the linkage structure drives the seat board to move and sink, it drives the back board and the leg board to form an inclination angle to meet the user's lying posture requirements, and only needs to set a driving device at a certain point of the linkage structure to realize the linkage deformation of the electric bed, which improves the control and reliability of the electric bed, greatly reduces the overall weight of the electric bed, reduces the complexity of using the electric bed, and reduces the cost of the electric bed.

Description

Technical Field

[0001] The present application relates to the field of bedding, and in particular to bed boards and electric beds. Background Art

[0002] At present, electric beds are widely used in the fields of leisure, nursing, medical treatment and elderly care. For ease of use, the bed boards of electric beds are mostly combined in different areas to meet the use postures of different users. The bed boards of existing electric beds are mostly a combination of two to four boards. The number of boards determines the combination freedom of the bed boards of the electric bed, which is currently mostly two to four degrees of freedom. For example, the bed board of an electric bed with four degrees of freedom is composed of four boards. When in use, three boards can be tilted to a certain angle or laid flat under the drive of a driving device, but the seat board supporting the center of gravity of the human body is stable and does not change, that is, there is no height change or inclination change. However, this structure requires a driving device to be installed on each variable board separately. The electric bed is very bulky and the automation effect is not good. Summary of the invention

[0003] The main purpose of this application is to provide a bed board, aiming to solve the technical problems of existing electric beds being bulky and having poor automation effects.

[0004] The present application provides a bed board, comprising a backboard, a seat board and a leg board arranged in sequence, wherein the backboard, the seat board and the leg board are movably connected via a linkage structure, and the linkage structure drives the seat board to move and sink in a direction perpendicular to the plane where the seat board is located, drives the backboard to tilt up at one end away from the seat board, and drives the leg board to tilt up at one end away from the seat board.

[0005] Preferably, the linkage structure comprises a fixed bracket and a transmission part;

[0006] One end of the transmission part is movably connected to the fixed bracket, and the other end is movably connected to the seat plate and / or the back plate;

[0007] The fixed bracket is composed of a first column, a second column and a crossbeam, and the first column and the second column are fixed to two ends of the crossbeam in parallel and opposite to each other;

[0008] The free end of the first column is rotatably connected to the back plate, and the free end of the second column is rotatably connected to the leg plate.

[0009] Preferably, the seat plate and the leg plate are hingedly connected by a first hinge; when the back plate, the seat plate and the leg plate are in the same horizontal plane, the seat plate and the back plate are arranged at a specified horizontal distance without connection; the transmission part includes a first support shaft, a second support shaft and a slide rail;

[0010] One end of the first support shaft is rotatably connected to the slide rail, and the other end of the first support shaft is rotatably connected to the back plate;

[0011] One end of the second support shaft is rotatably connected to the slide rail, and the other end of the second support shaft is rotatably connected to the seat plate;

[0012] The slide rail is slidably arranged on the cross beam. When the seat plate moves and sinks in a direction perpendicular to the plane where the seat plate is located, the slide rail slides along the cross beam toward the direction close to the leg plate.

[0013] Preferably, the number of the second support shafts is at least two; and the adjacent second support shafts, the slide rails and the seat plate form a deformable first parallelogram.

[0014] Preferably, the seat plate and the leg plate are hingedly connected via a second hinge; the back plate and the seat plate are hingedly connected via a third hinge; the transmission part includes a third support shaft and a slide rail;

[0015] One end of the third support shaft is rotatably connected to the slide rail, and the other end of the third support shaft is rotatably connected to the seat plate;

[0016] The slide rail is slidably arranged on the cross beam. When the seat plate moves and sinks in a direction perpendicular to the plane where the seat plate is located, the slide rail slides along the cross beam toward the direction close to the leg plate.

[0017] Preferably, the seat plate and the leg plate are hingedly connected by a fourth hinge; when the back plate, the seat plate and the leg plate are in the same horizontal plane, the seat plate and the back plate are arranged at a specified horizontal distance without connection; the transmission part includes a fourth support shaft and a slide rail;

[0018] One end of the fourth support shaft is rotatably connected to the slide rail, and the other end of the fourth support shaft is rotatably connected to the back plate;

[0019] An elastic support member is provided between the cross beam and the seat plate;

[0020] The slide rail is slidably arranged on the cross beam. When the seat plate squeezes the elastic support member and moves downward in a direction perpendicular to the plane where the seat plate is located, one end of the seat plate close to the back plate presses against the fourth support shaft, so that the fourth support shaft pushes the slide rail to slide along the cross beam in a direction close to the leg plate.

[0021] Preferably, the leg board includes a thigh board and a calf board, the thigh board is hinged to the seat board, and the second column is rotatably connected to the thigh board;

[0022] A first fixed shaft is arranged between the thigh plate and the calf plate, one end of the first fixed shaft is embedded in the slit between the thigh plate and the calf plate, the other end of the first fixed shaft is a free end, and the free end of the first fixed shaft is arranged relatively parallel to the second column;

[0023] The first fixed shaft is vertically fixedly connected to the calf board, and the first fixed shaft is rotatably connected to the thigh board.

[0024] Preferably, a second fixed axis is rotatably arranged between the second column and the first fixed axis, the second column, the first fixed axis, the second fixed axis and the thigh plate form a deformable second parallelogram, a third fixed axis is fixedly arranged between the first fixed axis and the calf plate, the third fixed axis, the calf plate and the first fixed axis form a supporting right triangle.

[0025] Preferably, there are two linkage structures, and the two linkage structures are symmetrically arranged on the side end surfaces of the back plate, the seat plate and the leg plate respectively.

[0026] The present application also provides an electric bed, comprising the above-mentioned bed board and a driving device; the driving device is connected to the linkage structure portion corresponding to the seat board, and drives the linkage structure to drive the seat board to move and sink in a direction perpendicular to the plane where the seat board is located.

[0027] The beneficial technical effects of the present application are as follows: the present application sets a suitable linkage structure, so that when the linkage structure drives the seat plate to translate and sink, it drives the back plate and the leg plate to form an inclination angle, thereby meeting the user's lying posture requirements, and only needs to set a driving device at a certain position of the linkage structure to realize the linkage deformation of the electric bed, thereby improving the control and reliability of the electric bed, greatly reducing the overall weight of the electric bed, reducing the complexity of using the electric bed, and at the same time reducing the cost of the electric bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the side structure of a bed board in one embodiment of the present application.

[0029] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] Reference Figure 1A bed board according to an embodiment of the present application comprises a backboard 1, a seat board 2 and a leg board 3 arranged in sequence, wherein the backboard 1, the seat board 2 and the leg board 3 are movably connected via a linkage structure, and the linkage structure drives the seat board 2 to move and sink in a direction perpendicular to the plane where the seat board 2 is located, drives one end of the backboard 1 away from the seat board 2 to tilt up, and drives one end of the leg board 3 away from the seat board 2 to tilt up.

[0032] The above-mentioned bed board abandons the commonly used design idea of ​​controlling the seat board 2 to be stable and unchanged, and realizes the deformation of the electric bed by changing the inclination angle of the back board 1 or the leg board 3. The above-mentioned bed board realizes the linkage deformation of the bed board through the cooperation of the linkage structure and the seat board 2 moving and sinking in a direction perpendicular to the plane where the seat board 2 is located. When the linkage structure drives the seat board 2 to move and sink or when the seat board 2 moves and sinks, it will trigger the linkage structure to move, drive the back board 1 and the leg board 3 to form an inclination angle to meet the user's lying posture requirements. The present application only needs to connect the drive device to any part of the linkage structure with transmission capability, and the linkage deformation of the electric bed can be realized, which is convenient for the installation of the drive device and saves the required number of drive devices, and greatly reduces the overall weight of the electric bed, improves the convenience when using the electric bed, and reduces the production cost of the electric bed. And the user can feel the use experience of the linkage effect driven by the sinking of the seat board 2 during use, and improve the automatic sensing. The tilting angle of the end of the back plate 1 away from the seat plate 2 and the tilting angle of the end of the leg plate 3 away from the seat plate 2 can be reasonably controlled by controlling the movement amplitude of the linkage structure and the displacement of the seat plate 2 to meet the user's needs for different tilt angles. Compared with the commonly used design idea of ​​controlling the seat plate 2 to be stable and unchanged, and realizing the deformation of the electric bed by changing the tilt angle of the back plate 1 or the leg plate 3, when the same electric bed deformation is realized by the translation and sinking of the seat plate 2 to meet the posture control requirements, the user's body on the electric bed is lifted less overall, the power consumption of the motor is smaller, and the mechanical structure and mechanical strength requirements of the connection between the motor and the bed board are lower.

[0033] Furthermore, the linkage structure includes a fixed bracket and a transmission part; one end of the transmission part is movably connected to the fixed bracket, and the other end is movably connected to the seat plate 2 and / or the back plate 1; the fixed bracket is composed of a first column 5, a second column 6 and a crossbeam 4, and the first column 5 and the second column 6 are fixed to the two ends of the crossbeam 4 in parallel and oppositely; the free end of the first column 5 is rotatably connected to the back plate 1, and the free end of the second column 6 is rotatably connected to the leg plate 3.

[0034] The fixed bracket is used to support the connection between the transmission part, the seat plate 2 and / or the back plate 1. One end of the transmission part is movably connected to the fixed bracket, including a sliding connection, such as a sliding track is provided on the cross beam 4 by a snap-on or recessed setting, and one end of the transmission part is rotationally connected to the sliding track, and the rotational resistance of the rotational connection is greater than the sliding resistance of the sliding track, so that the transmission part can push the sliding track to slide while rotating, so as to achieve the effect of linkage deformation of the bed board. The free end of the first column 5 is rotationally connected to the back plate 1, and the free end of the second column 6 is rotationally connected to the leg plate 3, so that the back plate 1 and the leg plate 3 only make an arc motion similar to a seesaw under the action of the linkage force, and only the inclination deformation occurs without displacement variable, so as to realize the bed board changing different inclination postures.

[0035] Furthermore, the seat plate 2 is hinged to the leg plate 3 through a first hinge; when the back plate 1, the seat plate 2 and the leg plate 3 are in the same horizontal plane, the seat plate 2 and the back plate 1 are arranged at a specified horizontal distance without connection; the transmission part includes a first support shaft 71, a second support shaft 72 and a slide rail 73; one end of the first support shaft 71 is rotatably connected to the slide rail 73, and the other end of the first support shaft 71 is rotatably connected to the back plate 1; one end of the second support shaft 72 is rotatably connected to the slide rail 73, and the other end of the second support shaft 72 is rotatably connected to the seat plate 2; the slide rail 73 is slidably arranged on the cross beam 4, and when the seat plate 2 moves and sinks in a direction perpendicular to the plane where the seat plate 2 is located, the slide rail 73 slides along the cross beam 4 in a direction close to the leg plate 3.

[0036] The seat plate 2 and the leg plate 3 are hinged by the first hinge. When the seat plate 2 sinks, the leg plate 3 can be driven to bear force by the hinge force. The leg plate 3 cooperates with the rotation connection of the free end of the second column 6. Under the action of the force and the rotation fulcrum of the free end of the second column 6, the leg plate 3 performs arcing motion with a change in inclination angle, driving the end of the leg plate 3 close to the seat plate 2 to sink and arc, while the end of the leg plate 3 away from the seat plate 2 is tilted and arced. One end of the second support shaft 72 is rotationally connected to the slide rail 73, and the other end of the second support shaft 72 is rotationally connected to the seat plate 2. The rotation connection can make the second support shaft 72 rotate and deform in accordance with the compression of the space between the seat plate 2 and the slide rail 73, that is, the angle between the second support shaft 72 and the slide rail 73 gradually decreases in the direction away from the leg plate 3 and gradually increases in the direction close to the leg plate 3. At the same time, the seat plate 2 follows the slide rail 73 to produce a horizontal displacement in the direction close to the leg plate 3, so as to achieve the effect of the seat plate 2 moving away from the back plate 1 and the effect of the space expansion of the seat plate 2. During the process of the seat plate 2 sliding and sinking, the slide plate slides and translates toward the leg plate 3 at the same time, and drives the first support shaft 71 to rotate and stretch. Then, the first support shaft 71 drives the back plate 1 to make an arc motion with a change in inclination angle under the action of the force and the rotation fulcrum of the free end of the first column 5, driving the end of the back plate 1 close to the seat plate 2 to sink and arc, while the end of the back plate 1 away from the seat plate 2 is tilted and arced, thereby completing the linkage deformation of the entire bed board. When the back plate 1, the seat plate 2 and the leg plate 3 are in the same horizontal plane, the seat plate 2 and the back plate 1 are spaced 1 to 2 cm apart. When the seat plate 2 sinks, it moves horizontally toward the leg plate 3. The sinking amplitude of the seat plate 2 is within 6 cm, and the horizontal displacement of the seat plate 2 is within 4 cm. Further increase the distance between the seat plate 2 and the back plate 1. The distance between the seat plate 2 and the back plate 1 can alleviate the compression of the mattress or the human body on the force-bearing surface of the bed board during the deformation of the bed board, thereby improving the comfort and safety of use. The seat plate 2 and the leg plate 3, as well as the seat plate 2 and the back plate 1 are connected in different ways, which not only achieves the effect of relieving the squeezing between the back plate 1 and the seat plate 2, but also allows the inclination angles between the seat plate 2 and the back plate 1 to be designed to be different under the same sinking displacement of the seat plate 2, and the inclination angles between the seat plate 2 and the leg plate 3 to be different, so that the deformation posture of the bed board is more flexible.

[0037] Furthermore, the number of the second support shafts 72 is at least two; the adjacent second support shafts 72, the slide rails 73 and the seat plate 2 form a deformable first parallelogram.

[0038] The present application includes two or more second support shafts 72 between the seat plate 2 and the slide rail 73 to increase the support stability of the seat plate 2 and meet the need for the seat plate 2 to sink smoothly. The adjacent second support shafts 72 form a parallelogram, and when the seat plate 2 sinks, the size of the inner angle of the parallelogram is changed to achieve the deformation of the parallelogram, thereby meeting the space requirement between the seat plate 2 and the slide rail 73 when the seat plate 2 sinks. The present application sets a parallelogram structure between the seat plate 2 and the slide rail 73 to keep the seat plate 2 always horizontal during the sinking process without changing the inclination angle, meet the user's use needs, and extend the service life of the second support shaft 72.

[0039] Furthermore, the seat plate 2 and the leg plate 3 are hinged through a second hinge; the back plate 1 and the seat plate 2 are hinged through a third hinge; the transmission part includes a third support shaft and a slide rail 73; one end of the third support shaft is rotatably connected to the slide rail 73, and the other end of the third support shaft is rotatably connected to the seat plate 2; the slide rail 73 is slidably arranged on the cross beam 4, and when the seat plate 2 moves and sinks in a direction perpendicular to the plane where the seat plate 2 is located, the slide rail 73 slides along the cross beam 4 toward the direction close to the leg plate 3.

[0040] The seat plate 2 and the leg plate 3, as well as the seat plate 2 and the back plate 1 are all hinged by hinges. The upper limit of the hinged rotation angle range is that the seat plate 2, the leg plate 3 and the back plate 1 are on the same horizontal line, and the lower limit is the maximum angle corresponding to when the seat plate 2 sinks to parallel with the slide rail 73, or a certain specified angle less than the above maximum angle. Different hinge rotation angles can also be set as needed to control the sinking amplitude of the seat plate 2, and the hinge rotation angle can be set in multiple gears. This embodiment drives the back plate 1 and the leg plate 3 to make an arc rotation with a change in inclination angle through the translational sinking of the seat plate 2 and the rotation fulcrum of the free end of the pillar, and the structure is simpler.

[0041] Furthermore, the seat plate 2 is hinged to the leg plate 3 through a fourth hinge; when the back plate 1, the seat plate 2 and the leg plate 3 are in the same horizontal plane, the seat plate 2 and the back plate 1 are arranged at a specified horizontal distance without connection; the transmission part includes a fourth support shaft and a slide rail 73; one end of the fourth support shaft is rotatably connected to the slide rail 73, and the other end of the fourth support shaft is rotatably connected to the back plate 1; an elastic support member is arranged between the cross beam 4 and the seat plate 2; the slide rail 73 is slidably arranged on the cross beam 4, and when the seat plate 2 squeezes the elastic support member and moves and sinks in a direction perpendicular to the plane where the seat plate 2 is located, the end of the seat plate 2 close to the back plate 1 presses against the fourth support shaft, so that the fourth support shaft pushes the slide rail 73 to slide along the cross beam 4 in the direction close to the leg plate 3.

[0042] When the seat plate 2 sinks, it presses against the fourth support shaft, so that the fourth support shaft extends toward the slide rail 73 under the pressure, and pushes the slide rail 73 connected thereto to slide toward the leg plate 3. The sliding of the slide rail 73 further pulls the fourth support shaft to extend toward the slide rail 73, and drives the back plate 1 to sink and move in an arc at the end close to the seat plate 2 under the support of the rotating fulcrum at the free end of the first column 5, causing the inclination angle of the back plate 1 to change; when the seat plate 2 sinks, the leg plate 3 is driven to move in an arc close to the end of the seat plate 2 through the hinge force corresponding to the fourth hinge, causing the inclination angle of the leg plate 3 to change. The elastic support member can support the seat plate 2, and deform after being subjected to force, so as to meet the requirement of compressing the space between the seat plate 2 and the slide rail 73 when the seat plate 2 sinks. The elastic support member includes but is not limited to springs or elastic cotton. The functions and structures of the second hinge and the fourth hinge are the same as those of the first hinge, and the structure of the second hinge is similar to that of the first hinge.

[0043] Furthermore, the leg board 3 includes a thigh board 31 and a calf board 32, the thigh board 31 is hinged to the seat board 2, and the second column 6 is rotatably connected to the thigh board 31; a first fixed shaft 81 is arranged between the thigh board 31 and the calf board 32, one end of the first fixed shaft 81 is embedded in the slit between the thigh board 31 and the calf board 32, and the other end of the first fixed shaft 81 is a free end, and the free end of the first fixed shaft 81 is arranged relatively parallel to the second column 6; the first fixed shaft 81 is vertically fixedly connected to the calf board 32, and the first fixed shaft 81 is rotatably connected to the thigh board 31.

[0044] When the above-mentioned bed board is composed of three boards, it corresponds to the back board 1, the seat board 2 and the leg board 3; when it is composed of four boards, it corresponds to the back board 1, the seat board 2, the thigh board 31 and the calf board 32. The more small boards included in the bed board, the higher the degree of freedom of deformation of the bed board, and the better it can meet the needs of users with different postures. The above-mentioned thigh board 31 changes its inclination angle under the drive of the linkage structure, and the above-mentioned calf board 32 always remains horizontal to improve the user's comfort. When the thigh board 31 is forced to make an arc motion similar to a seesaw, in order to avoid the above-mentioned calf board 32 being affected, a first fixed shaft 81 is set between the thigh board 31 and the calf board 32 to keep the calf board 32 always in a horizontal state and not affected by the linkage structure.

[0045] Furthermore, a second fixed axis 82 is rotatably arranged between the second column 6 and the first fixed axis 81, and the second column 6, the first fixed axis 81, the second fixed axis 82 and the thigh plate 31 form a deformable second parallelogram, and a third fixed axis 83 is fixedly arranged between the first fixed axis 81 and the calf plate 32, and the third fixed axis 83, the calf plate 32 and the first fixed axis 81 form a supporting right triangle.

[0046] The third fixed shaft 83 and the first fixed shaft 81 play the role of strengthening and fixing the calf plate 32, so that the calf plate 32 maintains a horizontal state. In order to prevent the rotation fulcrum between the first fixed shaft 81 and the thigh plate 31 and the rotation fulcrum of the free end of the second column 6 from affecting the arcing motion of the thigh plate 31, the second fixed shaft 82 is rotatably arranged between the second column 6 and the first fixed shaft 81, and the second fixed shaft 82 is rotatably connected with the second column 6 and the first fixed shaft 81 respectively, so that the second column 6, the first fixed shaft 81, the second fixed shaft 82 and the thigh plate 31 form a deformable second parallelogram with a changeable inner angle. The third fixed shaft 83, the calf plate 32 and the first fixed shaft 81 form a supporting right triangle, ensuring that when the second parallelogram is deformed following the arcing motion of the thigh plate 31, the calf plate 32 is not affected, thereby improving the stability of the calf plate 32 to maintain a horizontal state.

[0047] Furthermore, there are two linkage structures, and the two linkage mechanisms are symmetrically arranged on the side end surfaces of the back plate 1, the seat plate 2 and the leg plate 3 respectively.

[0048] The above linkage structure can be arranged on the center line of the seat plate 2, the back plate 1 and the leg plate 3 along the length direction of the bed plate. In order to facilitate the user's operation and control, it is preferred that the linkage structure is respectively connected to the side end surfaces of the back plate 1, the seat plate 2 and the leg plate 3. The above linkage structure and the hinge can be directly connected with the back plate 1, the seat plate 2 and the leg plate 3, and can also be connected with the auxiliary parts corresponding to the back plate 1, the seat plate 2 and the leg plate 3 respectively. The auxiliary parts are arranged as a whole on the opposite side of the force-bearing surface of the back plate 1, the seat plate 2 and the leg plate 3 to improve the structural stability.

[0049] The present application also provides an electric bed, comprising the above-mentioned bed board and a driving device; the driving device is connected to the linkage structure portion corresponding to the seat board 2, and drives the linkage structure to drive the seat board 2 to move and sink in a direction perpendicular to the plane where the seat board 2 is located.

[0050] The bed board of the present application can be used for deformation of bedding without electric drive, such as bedding controlled by a machine lever. The present application is preferentially used for bed boards of electric beds, and the driving device is connected to the linkage structure to push any part of the linkage, such as being connected to the opposite side of the force-bearing surface of the seat plate 2, applying a force to stretch the seat plate 2 downward; connecting the first support shaft 71 to apply a thrust or pull toward the slide rail 73; connecting the back plate 1 to apply a tilting force that pushes the back plate 1 away from one end of the seat plate 2 or a sinking force that pulls the back plate 1 closer to one end of the seat plate 2, and connecting the leg plate 3 has a similar effect and will not be repeated; connecting the slide rail 73 to apply a sliding force that slides the slide rail 73 toward the calf plate 32, etc. The terms "first", "second", etc. in the present application are only used for distinction and are not used for limitation.

[0051] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A bed board, It is characterized in that It comprises a back plate, a seat plate and a leg plate arranged in sequence, wherein the back plate, the seat plate and the leg plate are movably connected through a linkage structure, and the linkage structure drives the seat plate to move and sink in a direction perpendicular to the plane where the seat plate is located, drives the end of the back plate away from the seat plate to tilt up, and drives the end of the leg plate away from the seat plate to tilt up; The linkage structure includes a fixed bracket and a transmission part; One end of the transmission part is movably connected to the fixed bracket, and the other end is movably connected to the seat plate and / or the back plate; The fixed bracket is composed of a first column, a second column and a crossbeam, and the first column and the second column are fixed to two ends of the crossbeam in parallel and opposite to each other; The free end of the first column is rotatably connected to the back plate, and the free end of the second column is rotatably connected to the leg plate; The seat plate and the leg plate are hingedly connected by a first hinge; when the back plate, the seat plate and the leg plate are in the same horizontal plane, the seat plate and the back plate are arranged at a specified horizontal distance without connection; the transmission part includes a first support shaft, a second support shaft and a slide rail; One end of the first support shaft is rotatably connected to the slide rail, and the other end of the first support shaft is rotatably connected to the back plate; One end of the second support shaft is rotatably connected to the slide rail, and the other end of the second support shaft is rotatably connected to the seat plate; The slide rail is slidably arranged on the cross beam, and when the seat plate moves and sinks in a direction perpendicular to the plane where the seat plate is located, the slide rail slides along the cross beam toward the direction close to the leg plate; The seat plate and the leg plate are hingedly connected via a second hinge; the back plate and the seat plate are hingedly connected via a third hinge; the transmission part includes a third support shaft and a slide rail; One end of the third support shaft is rotatably connected to the slide rail, and the other end of the third support shaft is rotatably connected to the seat plate; The slide rail is slidably arranged on the cross beam, and when the seat plate moves and sinks in a direction perpendicular to the plane where the seat plate is located, the slide rail slides along the cross beam toward the direction close to the leg plate; The seat plate and the leg plate are hingedly connected by a fourth hinge; when the back plate, the seat plate and the leg plate are in the same horizontal plane, the seat plate and the back plate are arranged at a specified horizontal distance without connection; the transmission part includes a fourth support shaft and a slide rail; One end of the fourth support shaft is rotatably connected to the slide rail, and the other end of the fourth support shaft is rotatably connected to the back plate; An elastic support member is provided between the cross beam and the seat plate; The slide rail is slidably arranged on the cross beam. When the seat plate squeezes the elastic support member and moves downward in a direction perpendicular to the plane where the seat plate is located, one end of the seat plate close to the back plate presses against the fourth support shaft, so that the fourth support shaft pushes the slide rail to slide along the cross beam in a direction close to the leg plate.

2. The bed board according to claim 1, It is characterized in that The number of the second support shafts is at least two; the adjacent second support shafts, the slide rails and the seat plate form a deformable first parallelogram.

3. The bed board according to any one of claims 1 to 2, It is characterized in that The leg board includes a thigh board and a calf board, the thigh board is hinged to the seat board, and the second column is rotatably connected to the thigh board; A first fixed shaft is arranged between the thigh plate and the calf plate, one end of the first fixed shaft is embedded in the slit between the thigh plate and the calf plate, the other end of the first fixed shaft is a free end, and the free end of the first fixed shaft is arranged relatively parallel to the second column; The first fixed shaft is vertically fixedly connected to the calf board, and the first fixed shaft is rotatably connected to the thigh board.

4. The bed board according to claim 3, It is characterized in that A second fixed axis is rotatably arranged between the second column and the first fixed axis, and the second column, the first fixed axis, the second fixed axis and the thigh plate form a deformable second parallelogram; a third fixed axis is fixedly arranged between the first fixed axis and the calf plate, and the third fixed axis, the calf plate and the first fixed axis form a supporting right triangle.

5. The bed board according to any one of claims 1 to 2, It is characterized in that There are two linkage structures, and the two linkage structures are symmetrically arranged on the side end surfaces of the back plate, the seat plate and the leg plate respectively.

6. An electric bed, It is characterized in that The bed board comprises the bed board as described in any one of claims 1 to 5, and further comprises a driving device; the driving device is connected to the linkage structure portion corresponding to the seat board, and drives the linkage structure to cause the seat board to move and sink in a direction perpendicular to the plane where the seat board is located.

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