Adjustable bed frame and electric bed

Abstract

The invention discloses an adjustable bed frame and an electric bed, belongs to the field of electric bed frames, solves the problem that a driving device needs to output larger thrust, and adopts the technical scheme that the adjustable bed frame mainly comprises a fixed bed frame, an adjustable bed frame, a primary lifting mechanism and a secondary lifting mechanism, the linear actuator drives the sliding part to do reciprocating linear motion, the sliding part is provided with a first pushing part and a second pushing part, the adjustable bed frame is pivoted to the fixed bed frame, the first-stage lifting mechanism comprises a first support with a slope surface, and the second-stage lifting mechanism comprises a second driving support and a second driven support with a slope surface. The first stroke of the sliding component enables the adjustable bed frame to be lifted to a first inclination angle, the second stroke of the sliding component enables the adjustable bed frame to be lifted to a second inclination angle, and the first stroke and the second stroke are successive and continuous in the same direction. The driving device is mainly used for reducing the thrust required to be output by the driving device.

Description

Technical Field

[0001] The present invention discloses an adjustable bed frame and an electric bed, belonging to the technical field of electric bed frames. Background Art

[0002] With the improvement of living standards, people have put forward higher requirements for furniture. The bed frame of an electric bed can adjust its shape or height in an electrically controlled manner, which is commonly used in families or medical care. The electric bed has many functions. Among those related to the bed frame part, it usually includes functions such as adjustable head inclination of the bed board, adjustable leg height of the bed board, adjustable overall height of the bed board, and adjustable overall inclination of the bed board.

[0003] For example, Patent CN212280661U discloses a zero-wall electric bed, which includes a bed board structure, a bed frame structure, and a back telescopic motor. The bed board structure includes a back board and a back board seat board, and the back board rotates relative to the back board seat board. The bed frame structure includes a fixed frame and a movable frame. One end of the back telescopic motor is rotatably connected to the back board, and one end is rotatably connected to the movable frame. When the back telescopic motor moves, it drives the back board to rotate up or down relative to the back board seat board, thereby realizing the adjustment of the inclination angle of the back board; in this patent, in order to lift the back board from the flat state, an angle needs to be formed between the back telescopic motor and the back board, which causes the end of the back telescopic motor to protrude downward, thereby increasing the thickness of the entire bed board, increasing the space occupied by the bed board, making the packaging volume larger, and being not conducive to the transportation of the bed board; in addition, during the lifting process of the back board, the entire weight of the back board is borne by the back telescopic motor, which causes the back telescopic motor to output a greater thrust, easily affecting the service life of the back telescopic motor.

[0004] Another example is that Patent CN220937425U discloses a modular longitudinal bracket, an electric bed frame and an electric bed for an electric bed frame, which includes a back bracket, an intermediate bracket, a driver, and a transmission assembly. The back bracket includes a transmission lever, and the transmission lever has a driving end, a driven end, and a hinge hole between the driving end and the driven end. The transmission assembly includes a transmission lead screw and a first pushing part provided on the transmission lead screw. When the back bracket rotates, the driver drives the first pushing part to push the driving end to move, so that the entire transmission lever rotates around the hinge hole. At this time, the driven end will drive the back bracket to rotate synchronously to lift the back bracket; similarly, in this patent, in order to lift the back bracket from the flat state, an angle will be formed between the driving end of the entire transmission lever and the back bracket, thereby increasing the thickness of the entire transmission lever, resulting in an increase in the overall thickness of the bed frame, making the packaging volume larger, and being not conducive to the transportation of the bed board; in addition, during the lifting process of the back bracket, the entire weight of the back bracket also acts on the driver through the transmission lever, and the driver also needs to output a relatively large thrust to drive the back bracket to rotate. Summary of the Invention

[0005] The object of the present invention is to solve the problem that the thrust required to be output by the driving device is greater. For this purpose, an adjustable bed frame and an electric bed are provided, which can reduce the thrust required to be output by the driving device.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An adjustable bed frame, comprising:

[0008] A fixed bed frame, which is installed with a linear actuator and a sliding member. The sliding member is slidably supported on the fixed bed frame. The linear actuator drives the sliding member to perform a reciprocating linear motion along the longitudinal direction of the fixed bed frame. The sliding member has a first pushing portion and a second pushing portion;

[0009] An adjustable bed frame, which is pivotally connected to the fixed bed frame and can be flipped relative to the fixed bed frame to change the inclination angle;

[0010] A lifting mechanism, which includes a primary lifting mechanism and a secondary lifting mechanism. The primary lifting mechanism includes a first bracket fixed to the adjustable bed frame. The first bracket has a slope surface. The secondary lifting mechanism includes a second active bracket and a second driven bracket. One end of the second driven bracket is pivotally connected to the fixed bed frame, and the other end is pivotally connected to the second active bracket;

[0011] Wherein, in the first stroke of the sliding member, the first pushing portion pushes the first bracket along the slope surface to lift the adjustable bed frame to a first inclination angle. In the second stroke of the sliding member, the second pushing portion pushes the second active bracket to lift the adjustable bed frame to a second inclination angle. The first stroke and the second stroke are successive and continuous in the same direction.

[0012] The beneficial effects of adopting the present invention are as follows:

[0013] In the present invention, the lifting mechanism includes a primary lifting mechanism and a secondary lifting mechanism. The sliding member has a first pushing portion and a second pushing portion. In the first stroke of the sliding member, the first pushing portion pushes the first bracket along the slope surface. The first pushing portion gradually lifts the adjustable bed frame through the slope surface, so that the adjustable bed frame is gradually lifted from a lying state to increase the inclination angle of the adjustable bed frame. During the lifting process, the sliding member forms a support for the adjustable bed frame through the first pushing portion. At this time, the component force of the force received by the sliding member in the vertical direction is greater than the component force in the horizontal direction. The fixed bed frame can form a support for the sliding member to disperse the component force received by the sliding member in the vertical direction. Therefore, the linear actuator only needs to overcome the component force received by the sliding member in the horizontal direction and the friction between the sliding member and the fixed bed frame to drive the sliding member to slide, without having to overcome the weight of the entire adjustable bed frame. Therefore, the thrust required to be output by the linear actuator can be greatly reduced, which helps to extend the service life of the linear actuator. At the same time, it can also enable the linear actuator to push a larger load and improve the maximum load of the electric bed frame.

[0014] In addition, the secondary lifting mechanism in the present invention includes a second driving bracket and a second driven bracket that are pivotally connected to each other. During the second stroke of the sliding member, the second pushing portion pushes the second driving bracket to rotate. During the rotation of the second driving bracket, the second driving bracket drives the second driven bracket to rotate around the fixed bed frame. The second driven bracket supports the adjustable bed frame and lifts the adjustable bed frame to the second inclination angle. As the sliding member slides, the inclination angle of the second driving bracket gradually increases under the action of the second pushing portion. Therefore, the component force in the horizontal direction of the second driving bracket acting on the second pushing portion will gradually decrease. The linear actuator only needs to overcome the component force in the horizontal direction received by the sliding member and the friction force between the sliding member and the fixed bed frame to drive the sliding member to slide, without having to overcome the weight of the entire adjustable bed frame. Therefore, the linear actuator still only needs to output a small thrust to push a larger load, which can increase the maximum load of the electric bed frame and also extend the service life of the linear actuator.

[0015] Secondly, during the process of the sliding member switching from the first stroke to the second stroke in the present invention, the support of the sliding member for the adjustable bed frame switches from the first pushing portion to the second pushing portion. The first stroke and the second stroke of the sliding member are successive and continuous in the same direction, making the switching of the support point of the sliding member for the adjustable bed frame smoother, which helps to keep the adjustable bed frame lifted smoothly and avoid the possibility of the adjustable bed frame dropping suddenly, and helps to improve the user experience.

[0016] Preferably, the sliding member pushes the secondary lifting mechanism to pre-lift during the first stroke, and the pre-lifting of the secondary lifting mechanism causes the second driving bracket to tilt relative to the fixed bed frame or increases the tilt angle of the second driving bracket. With the foregoing technical solution, during the first stroke, the sliding member pushes the secondary lifting mechanism to pre-lift. One end of the second driven bracket is pivotally connected to the fixed bed frame. Therefore, the end of the second driven bracket that is pivotally connected to the second driving bracket is lifted by the sliding member, that is, the second driving bracket is in an inclined state as a whole. During the second stroke of the sliding member, the second pushing portion applies a thrust to the second driving bracket. Since an included angle has been formed between the second driving bracket and the fixed bed frame during the first stroke, the second driving bracket is more easily lifted under the push of the second pushing portion, which can reduce the thrust required for the second pushing portion to push the second driving bracket, and further reduce the thrust that the linear actuator needs to output, which helps to extend the service life of the linear actuator.

[0017] Preferably, the second active bracket or the second driven bracket is provided with a convex block extending towards the fixed bed frame. A guiding surface is provided on the side of the convex block facing the sliding member. The sliding member has a stepped portion. In the first stroke, the stepped portion pushes the convex block to rise along the guiding surface to pre-lift the secondary lifting mechanism. With the foregoing technical solution, in the first stroke of the sliding member, the stepped portion raises the convex block along the guiding surface, and then raises the pivot joint of the second active bracket and the second driven bracket, forming an angle between the second active bracket and the fixed bed frame. When the sliding member is in the second stroke, the second pushing portion applies a thrust to the second active bracket. When the sliding member continues to slide, a horizontal thrust will be applied to the lowest end of the second active bracket, enabling the second active bracket to continue to increase the inclination angle. At the same time, the second active bracket can also continue to raise the second driven bracket, enabling the second active bracket to form a strong support for the second driven bracket, so as to lift the adjustable bed frame to the second inclination angle; in addition, the sliding member can lift the second active bracket through the convex block, reducing the external force required for the second active bracket to increase the inclination angle, preventing the possibility of jamming between the second active bracket and the second pushing portion, and ensuring the stability of the sliding member operation.

[0018] Preferably, when the adjustable bed frame is at the first inclination angle, the first pushing portion separably supports the first bracket. When the adjustable bed frame is at the second inclination angle, the second pushing portion separably supports the second active bracket, enabling the adjustable bed frame to descend by its own weight rather than being forced to drive by the descending torque of the linear actuator. With the foregoing technical solution, when the adjustable bed frame descends from the second inclination angle, when the sliding member slides reversely under the drive of the linear actuator, the second pushing portion will be separated from the second active bracket, thereby blocking the power transmission between the linear actuator and the second active bracket, enabling the adjustable bed frame to descend only by gravity. During the descending process, the frictional force between the sliding member and the fixed bed frame will also form a resistance to the descending of the adjustable bed frame, further slowing down the descending speed of the adjustable bed frame. If the user's finger is clamped between the adjustable bed frame and the fixed bed frame, the force received by the finger will be less than the force generated by the weight of the adjustable bed frame, reducing the harm to the finger or other limbs and helping to improve the safety of using the electric bed frame; similarly, when the adjustable bed frame descends from the first inclination angle, after the linear brake drives the sliding member to slide, the first pushing portion will also be separated from the first bracket, thereby blocking the power transmission between the linear actuator and the first bracket.

[0019] Preferably, the first pushing portion is a first roller rotatably connected to the sliding member. With the foregoing technical solution, using the first roller can form a rolling friction between the first pushing portion and the first bracket, thereby reducing the frictional force between the first pushing portion and the first bracket, and further reducing the thrust required by the linear actuator when the adjustable bed frame is lifted.

[0020] Preferably, a strip-shaped guiding hole is formed in the sliding member along its linear movement direction, one end of the guiding hole constitutes a second pushing portion, a guiding shaft is provided at one end of the second active bracket away from its pivoting portion, the guiding shaft is inserted into the guiding hole and slides relative to the guiding hole during the first stroke of the sliding member, and the second stroke starts at the moment when the guiding shaft abuts against the second pushing portion.

[0021] Preferably, the lifting mechanism further includes a three-stage lifting mechanism, the three-stage lifting mechanism includes a third active bracket and a third driven bracket, the third driven bracket is pivotally connected to the fixed bed frame and the third active bracket respectively, the sliding member has a third pushing portion, and the third stroke of the sliding member causes the third pushing portion to push the third active bracket to lift the adjustable bed frame to a third inclination angle. The third stroke and the second stroke are successive and continuous in the same direction. With the foregoing technical solution, during the third stroke of the sliding member, the third pushing portion pushes the third active bracket to rotate. During the rotation of the third active bracket, the third driven bracket is driven to rotate around the fixed bed frame. The third driven bracket supports the adjustable bed frame and lifts the adjustable bed frame to the third inclination angle. As the sliding member slides, the inclination angle of the third active bracket gradually increases under the action of the third pushing portion. Therefore, the horizontal component force of the third active bracket acting on the third pushing portion will gradually decrease. And the linear actuator only needs to overcome the horizontal component force received by the sliding member and the friction force between the sliding member and the fixed bed frame to drive the sliding member to slide, without having to overcome the weight of the entire adjustable bed frame. Therefore, the linear actuator still only needs to output a small thrust to push a larger load, which can increase the maximum load of the electric bed frame and also extend the service life of the linear actuator.

[0022] Preferably, the angle by which the adjustable bed frame is lifted during the third stroke is greater than the angle by which the adjustable bed frame is lifted during the second stroke, and the angle by which the adjustable bed frame is lifted during the third stroke is greater than the angle by which the adjustable bed frame is lifted during the first stroke. With the foregoing technical solution, the third stroke of the sliding member can be used to greatly increase the adjustment range of the adjustable bed frame, which can adapt to various different needs of users; in addition, as the inclination angle of the adjustable bed frame continuously increases, the thrust required for the linear actuator to push the sliding member will gradually decrease. And at the start of the third stroke, the inclination angle of the adjustable bed frame is already relatively large. Therefore, during the third stroke of the sliding member, the thrust required to be output by the linear actuator is small, that is, the linear actuator still only needs to output a small thrust to achieve a large-range angle adjustment of the adjustable bed frame.

[0023] Preferably, in the second stroke, the sliding member pushes the three-stage lifting mechanism to pre-lift, and the pre-lifting of the three-stage lifting mechanism increases the inclination angle of the third active bracket relative to the fixed bed frame. With the foregoing technical solution, in the second stroke, the sliding member pushes the three-stage lifting mechanism to pre-lift. One end of the third driven bracket is pivotally connected to the fixed bed frame. Therefore, the end where the third driven bracket and the third active bracket are pivotally connected to each other is lifted by the sliding member, that is, the third active bracket is in an inclined state as a whole. In the third stroke of the sliding member, the third pushing portion applies a thrust to the third active bracket. Since an included angle has been formed between the third active bracket and the fixed bed frame in the second stroke, the third active bracket can be more easily lifted under the push of the third pushing portion, which can reduce the thrust required for the third pushing portion to push the third active bracket, and further reduce the thrust required to be output by the linear actuator, which helps to extend the service life of the linear actuator.

[0024] Preferably, in the second stroke of the sliding member, the third driven bracket is lifted synchronously with the second driven bracket, and one end of the third active bracket away from the third driven bracket extends toward the sliding member and hangs down naturally.

[0025] Preferably, at the third inclination angle of the adjustable bed frame, the third pushing portion separably supports the third active bracket, so that the adjustable bed frame descends by its own weight instead of being forced to drive by the descending torque of the linear actuator. With the foregoing technical solution, when the adjustable bed frame descends from the third inclination angle, and the sliding member slides reversely under the drive of the linear actuator, the third pushing portion will be separated from the third active bracket, thereby blocking the power transmission between the linear actuator and the third active bracket, enabling the adjustable bed frame to descend only by gravity. During the descending process, the frictional force between the sliding member and the fixed bed frame will also form a resistance to the descending of the adjustable bed frame, further slowing down the descending speed of the adjustable bed frame. If the user's finger is caught between the adjustable bed frame and the fixed bed frame, the force received by the finger will be less than the force generated by the weight of the adjustable bed frame, reducing the harm to the finger or other limbs, which helps to improve the use safety of the electric bed frame.

[0026] Preferably, the third pushing portion is a horizontally arranged hinge shaft, the axial direction of the hinge shaft is perpendicular to the sliding direction of the sliding member, a slot is provided at the end of the third active bracket close to the sliding member, and a notch is formed on the side of the slot facing the sliding member. In the third stroke, the hinge shaft is embedded in the slot and forms a pivot connection with the third active bracket. With the foregoing technical solution, the notch of the third active bracket can ensure that the hinge shaft can form a hinge with the third active bracket, and when the sliding member slides reversely, it can also ensure that the hinge shaft disengages from the slot, separating the third active bracket from the third pushing portion, ensuring that the third active bracket only functions when the sliding member is in the third stroke, making the overall operation of the adjustable bed frame more stable and reliable.

[0027] Preferably, the third driven bracket is a part of the second driven bracket. The second driven bracket further includes a connecting rod. One end of the connecting rod is pivotally connected to the end of the third driven bracket, and the other end is pivotally connected to the second driving bracket. The third driving bracket is pivotally connected to the middle of the third driven bracket.

[0028] Preferably, a limiting plate is provided on one side of the third driven bracket facing the adjustable bed frame. Part of the connecting rod is located below the limiting plate. In the second stroke of the sliding member, the second driving bracket pushes the connecting rod to abut against the limiting plate. In the third stroke of the sliding member, the connecting rod rotates relative to the third driven bracket around the fixed bed frame, and the included angle between the connecting rod and the second driving bracket gradually increases. With the foregoing technical solution, the limiting plate can limit the rotation of the connecting rod towards the adjustable bed frame. In the second stroke of the sliding member, the second pushing portion pushes the connecting rod through the second driving bracket, and the connecting rod drives the third driven bracket to lift synchronously through the limiting plate. At this time, the connecting rod and the third driven bracket form a stable whole, so that the support between the second driving bracket and the connecting rod is stable and reliable, and the adjustable bed frame can rise smoothly, which helps to improve the user experience.

[0029] Preferably, a second roller is rotatably connected to the top end of the third driven bracket. In the third stroke, the third driven bracket forms a rolling friction with the adjustable bed frame through the second roller. With the foregoing technical solution, in the third stroke of the sliding member, the third pushing portion forms a support for the third driven bracket through the third driving bracket. At this time, the top end of the third driven bracket abuts against the adjustable bed frame. During the continuous lifting of the adjustable bed frame, the contact point between the third driven bracket and the adjustable bed frame is constantly changing. Therefore, the third driven bracket abuts against the adjustable bed frame through the second roller, which can form a rolling friction between the third driven bracket and the adjustable bed frame, thereby reducing the friction between the third driven bracket and the adjustable bed frame, reducing the thrust required for the linear actuator to output, and reducing the possibility of wear between the third driven bracket and the adjustable bed frame, which helps to extend the service life of the third driven bracket and the adjustable bed frame.

[0030] Preferably, the pushing and pulling direction of the linear actuator is parallel to the longitudinal direction of the fixed bed frame, and the linear brake is within the thickness range of the fixed bed frame. With the foregoing technical solution, the linear actuator is within the thickness range of the fixed bed frame, making the connection structure between the fixed bed frame and the linear actuator more compact, and the installation of the linear actuator does not affect the thickness of the fixed bed frame, which helps to reduce the thickness of the overall adjustable bed frame when the adjustable bed frame is in the lying state, and thus can reduce the packaging size of the adjustable bed frame, which is beneficial to the transportation and storage of the adjustable bed frame. In addition, the sliding member slides along the longitudinal direction of the fixed bed frame under the drive of the linear actuator, and the sliding member acts on the first-stage lifting mechanism and the second-stage lifting mechanism to rotate towards the upper side of the fixed bed frame. Therefore, during the rotation of the adjustable bed frame, the linear actuator and the sliding member do not protrude towards the bottom of the fixed bed frame, that is, the adjustable bed frame does not affect the lower space of the fixed bed frame during use, and there is no need to reserve space under the fixed bed frame during installation, making the installation of the adjustable bed frame simpler and more convenient, and also being able to reduce the installation space of the adjustable bed frame.

[0031] Preferably, the brackets of each stage of the lifting mechanism are two paired support rods, and the two support rods are spaced apart in the width direction of the fixed bed frame. With the foregoing technical solution, using paired brackets can increase the support positions of the lifting mechanism on the adjustable bed frame, making the support of the lifting mechanism on the adjustable bed frame more stable and reducing the possibility of the adjustable bed frame swinging or shaking during lifting; in addition, it can also reduce the pressure on each support rod and reduce the possibility of the support rod deforming or breaking.

[0032] Preferably, the fixed bed frame is provided with a sliding surface along its longitudinal direction, and the sliding member slides along the sliding surface.

[0033] Preferably, the fixed bed frame is provided with a support frame along its longitudinal direction. The support frame includes a bottom plate for supporting the sliding member and side plates for restricting the sliding direction of the sliding member, and the upper surface of the bottom plate forms the sliding surface.

[0034] Preferably, a sliding pad for reducing friction is provided on the bottom or sliding surface of the sliding member. The sliding member is slidably engaged with the fixed bed frame through the sliding pad. The sliding pad partially extends between the sliding member and the side plate, and both sides of this part of the sliding pad are in contact with the side wall of the sliding member and the side plate respectively. With the foregoing technical solution, the friction between the sliding member and the fixed bed frame can be effectively reduced by the sliding pad. During the lifting process of the adjustable bed frame, the linear actuator needs to overcome the horizontal component force received by the sliding member and the friction between the sliding member and the fixed bed frame. After the friction is reduced, the thrust required to be output by the linear actuator can be further reduced, enabling the linear actuator to push a larger load, which helps to increase the maximum load of the adjustable bed frame. Secondly, since part of the sliding pad is located between the sliding member and the side plate, direct contact between the sliding member and the side plate can be avoided, reducing the possibility of wear on the side wall of the sliding member and also reducing the friction between the sliding member and the side plate. Additionally, by filling part of the sliding pad between the sliding member and the side plate, the sliding pad and the side plate can restrict the sliding direction of the sliding member, ensuring that the sliding member can slide along the longitudinal direction of the fixed bed frame and preventing the sliding member from shifting or wobbling in the width direction of the fixed bed frame, making the sliding of the sliding member more stable and reliable.

[0035] Preferably, a rolling friction is formed between the sliding member and the sliding surface.

[0036] Preferably, two sets of adjustable bed frames are provided along the longitudinal direction of the fixed bed frame. One end of each of the two sets of adjustable bed frames close to each other is pivotally connected to the fixed bed frame respectively. The two sets of adjustable bed frames have opposite tilting directions, and the adjustable bed frame has two sets of lifting mechanisms, and the two sets of lifting mechanisms independently drive the adjustable bed frame to lift. With the foregoing technical solution, setting two adjustable bed frames can lift the user's back and legs respectively, making the shape change of the adjustable bed frame more conform to the human body posture to meet different needs of users, which helps to improve the comfort of users.

[0037] Preferably, the linear actuator includes a motor, a lead screw, and a nut sleeved on the lead screw. The motor is fixed to the fixed bed frame, the lead screw is distributed along the longitudinal direction of the fixed bed frame, the output end of the motor is in transmission cooperation with the lead screw and drives the lead screw to rotate, and the nut is fixedly connected to the sliding member.

[0038] The present invention also discloses an electric bed, including an adjustable bed frame, the adjustable bed frame includes a fixed bed frame, an adjustable bed frame pivotally connected to the fixed bed frame, and a lifting mechanism for driving the adjustable bed frame to flip relative to the fixed bed frame, and the adjustable bed frame adopts the adjustable bed frame described in any one of the above.

[0039] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention will be further described below in conjunction with the accompanying drawings:

[0041] Figure 1 It is a schematic structural diagram of the adjustable bed frame in a flat state in the first embodiment of the present invention;

[0042] Figure 2 It is a partial cross-sectional view of the adjustable bed frame in a flat state in the first embodiment of the present invention;

[0043] Figure 3 It is a schematic structural diagram of the first-level lifting mechanism and the second-level lifting mechanism in the first embodiment of the present invention;

[0044] Figure 4 It is a partial cross-sectional view of the adjustable bed frame reaching the first inclination angle in the first embodiment of the present invention;

[0045] Figure 5 It is a partial cross-sectional view of the adjustable bed frame reaching the second inclination angle in the first embodiment of the present invention;

[0046] Figure 6 It is a schematic structural diagram of the lifting mechanism when the adjustable bed frame reaches the second inclination angle in the first embodiment of the present invention;

[0047] Figure 7 It is a schematic structural diagram of the adjustable bed frame with a three-level lifting mechanism in the second embodiment of the present invention;

[0048] Figure 8 It is a partial cross-section of the adjustable bed frame in a flat state in the second embodiment of the present invention Figure 1 ;

[0049] Figure 9 It is a partial cross-section of the adjustable bed frame in a flat state in the second embodiment of the present invention Figure 2 ;

[0050] Figure 10 It is a partial cross-section of the adjustable bed frame reaching the first inclination angle in the second embodiment of the present invention Figure 1 ;

[0051] Figure 11 It is a partial cross-section of the adjustable bed frame reaching the first inclination angle in the second embodiment of the present invention Figure 2 ;

[0052] Figure 12 It is a schematic structural diagram of the lifting mechanism when the adjustable bed frame reaches the first inclination angle in the second embodiment of the present invention;

[0053] Figure 13 It is a cross-sectional view of the lifting mechanism when the adjustable bed frame reaches the first inclination angle in the second embodiment of the present invention;

[0054] Figure 14 is Figure 13Partial enlarged view in

[0055] Figure 15 It is a partial cross-sectional view of the adjustable bed frame in the second embodiment of the present invention when it reaches the second inclination angle;

[0056] Figure 16 It is a schematic structural diagram of the lifting mechanism of the adjustable bed frame in the second embodiment of the present invention when it reaches the second inclination angle;

[0057] Figure 17 It is a partial cross-sectional view of the adjustable bed frame in the second embodiment of the present invention when it reaches the third inclination angle;

[0058] Figure 18 It is a schematic structural diagram of the lifting mechanism of the adjustable bed frame in the second embodiment of the present invention when it reaches the third inclination angle;

[0059] Figure 19 It is a schematic structural diagram of the adjustable bed frame in the second embodiment of the present invention at the maximum adjustment angle.

[0060] Reference numerals: 11, fixed bed frame; 111, support frame; 1111, bottom plate; 1112, side plate; 12, adjustable bed frame; 121, first bracket; 13, first leg plate; 14, second leg plate; 21, linear actuator; 211, motor; 212, lead screw; 213, nut; 22, sliding member; 221, guide hole; 222, second pushing portion; 223, first roller; 225, hinge shaft; 226, sliding pad; 23, second driven bracket; 231, third driven bracket; 2311, limit plate; 232, connecting rod; 2321, convex block; 2322, guiding surface; 233, second roller; 24, second active bracket; 25, third active bracket; 251, card slot. Detailed implementation manners

[0061] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention and not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0063] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] Embodiment 1:

[0065] As Figures 1 to 6 shown, this embodiment demonstrates an adjustable bed frame, including a fixed bed frame 11, an adjustable bed frame 12, a primary lifting mechanism, a secondary lifting mechanism, and a lifting mechanism. Among them, a linear actuator 21 and a sliding member 22 are installed on the fixed bed frame 11. The sliding member 22 is slidably supported on the fixed bed frame 11. The linear actuator 21 drives the sliding member 22 to perform a reciprocating linear motion along the longitudinal direction of the fixed bed frame 11. The sliding member 22 has a first pushing portion and a second pushing portion. The lifting mechanism includes a primary lifting mechanism and a secondary lifting mechanism. The adjustable bed frame 12 is pivotally connected to the fixed bed frame 11 and can be flipped relative to the fixed bed frame 11 to change the inclination angle. The primary lifting mechanism includes a first bracket 121 fixed to the adjustable bed frame 12. The first bracket 121 has a slope. The secondary lifting mechanism includes a second active bracket 24 and a second driven bracket 23. One end of the second driven bracket 23 is pivotally connected to the fixed bed frame 11, and the other end is pivotally connected to the second active bracket 24. The first stroke of the sliding member 22 causes the first pushing portion to push the first bracket 121 along the slope to lift the adjustable bed frame 12 to a first inclination angle. The second stroke of the sliding member 22 causes the second pushing portion to push the second active bracket 24 to lift the adjustable bed frame 12 to a second inclination angle. The first stroke and the second stroke are successive and continuous in the same direction.

[0066] In this embodiment, the adjustable bed frame lifting mechanism includes a primary lifting mechanism and a secondary lifting mechanism. The sliding member 22 has a first pushing portion and a second pushing portion. In the first stroke of the sliding member 22, the first pushing portion pushes the first support 121 along the slope. The first pushing portion gradually lifts the adjustable bed frame 12 through the slope, so that the adjustable bed frame 12 is gradually lifted from the flat state, increasing the inclination angle of the adjustable bed frame 12. During the lifting process, the sliding member 22 forms a support for the adjustable bed frame 12 through the first pushing portion. At this time, the component of the force received by the sliding member 22 in the vertical direction is greater than the component in the horizontal direction. The fixed bed frame 11 can form a support for the sliding member 22 to disperse the component of the force received by the sliding member 22 in the vertical direction. Therefore, the linear actuator 21 only needs to overcome the component of the force received by the sliding member 22 in the horizontal direction and the friction between the sliding member 22 and the fixed bed frame 11 to drive the sliding member 22 to slide, without having to overcome the weight of the entire adjustable bed frame 12. Therefore, the thrust required to be output by the linear actuator 21 can be greatly reduced, which helps to extend the service life of the linear actuator 21. At the same time, it can also enable the linear actuator 21 to push a larger load and improve the maximum load of the electric bed frame.

[0067] In addition, in this embodiment, the secondary lifting mechanism includes a second active support 24 and a second driven support 23 that are pivotally connected to each other. In the second stroke of the sliding member 22, the second pushing portion pushes the second active support 24 to rotate. During the rotation of the second active support 24, it drives the second driven support 23 to rotate around the fixed bed frame 11. The second driven support 23 forms a support for the adjustable bed frame 12 and lifts the adjustable bed frame 12 to the second inclination angle. As the sliding member 22 slides, the inclination angle of the second active support 24 gradually increases under the action of the second pushing portion. Therefore, the component of the force acting on the second pushing portion by the second active support 24 in the horizontal direction will gradually decrease. The linear actuator 21 still only needs to overcome the component of the force received by the sliding member 22 in the horizontal direction and the friction between the sliding member 22 and the fixed bed frame 11 to drive the sliding member 22 to slide, without having to overcome the weight of the entire adjustable bed frame 12. Therefore, the linear actuator 21 still only needs to output a small thrust to be able to push a larger load, improving the maximum load of the electric bed frame and extending the service life of the linear actuator 21 at the same time.

[0068] Secondly, during the process of the sliding member 22 switching from the first stroke to the second stroke in this embodiment, the support of the sliding member 22 for the adjustable bed frame 12 switches from the first pushing portion to the second pushing portion. The first stroke and the second stroke of the sliding member 22 are successive and continuous in the same direction, making the switching of the support point of the sliding member 22 for the adjustable bed frame 12 smoother, which helps to maintain the stable lifting of the adjustable bed frame 12 and avoid the possibility of the adjustable bed frame 12 dropping suddenly, contributing to improving the user experience.

[0069] As Figure 2 and Figure 3 shown, in this embodiment, the fixed bed frame 11 is formed into a rectangular frame surrounded by cross beams. A support plate is provided at the bottom inside the cross beams. One end of the adjustable bed frame 12 is rotatably connected to the middle of the support frame 111. The adjustable bed frame 12 rotates relative to the fixed bed frame 11 to adjust the tilt angle. When the adjustable bed frame 12 is in a flat state, the adjustable bed frame 12 is embedded in the fixed bed frame 11 and is supported by the support plate. The support plate can limit the adjustable bed frame 12 from rotating towards the lower side of the fixed bed frame 11, ensuring that the adjustable bed frame 12 can rotate towards the upper side of the fixed bed frame 11. At this time, the adjustable bed frame 12 is parallel to the fixed bed frame 11, and at least most of the adjustable bed frame 12 is within the thickness range of the fixed bed frame 11.

[0070] As Figure 2 shown, when the adjustable bed frame 12 is in a flat state, the sliding member 22 is also in the initial position. At this time, the adjustable bed frame 12 is embedded in the fixed bed frame 11, and neither the primary lifting mechanism nor the secondary lifting mechanism exceeds the top surface of the fixed bed frame 11. The first bracket 121 has a slope surface facing the sliding member 22, and the height of the first bracket 121 gradually increases as it moves away from the sliding member 22. The maximum height of the first bracket 121 is less than the height of the fixed bed frame 11. Therefore, neither the primary lifting mechanism nor the secondary lifting mechanism will raise the adjustable bed frame 12, so that the adjustable bed frame 12 and the fixed bed frame 11 can be kept compact, and thus the thickness of the entire adjustable bed frame when the adjustable bed frame 12 is in a flat state can be reduced.

[0071] As Figures 2 to 4As shown in the figure, in this embodiment, the linear actuator 21 includes a motor 211, a lead screw 212, and a nut 213 sleeved on the lead screw 212. A nut 213 that is threadedly connected to the lead screw 212 is fixed on the sliding member 22. The nut 213 is fixedly connected to the sliding member 22. A guide rail sliding surface for the reciprocating movement of the sliding member 22 is provided on the fixed bracket. The length direction of the sliding surface of the guide rail is parallel to the longitudinal direction of the fixed bracket. The sliding member 22 is placed on the sliding surface of the guide rail and is in sliding fit with the sliding surface of the guide rail. The sliding surface of the guide rail supports the sliding member 22. The motor 211 is fixed to one end of the sliding surface of the guide rail. The output end of the motor 211 is drivingly connected to the lead screw 212. The length direction of the lead screw 212 is parallel to the length direction of the sliding surface of the guide rail. The motor 211 drives the lead screw 212 to rotate. The lead screw 212 drives the sliding member 22 to reciprocate along the sliding surface of the guide rail through the nut 213. The sliding member 22 lifts the adjustable bed frame 12 through a primary lifting mechanism and a secondary lifting mechanism to adjust the tilt angle of the adjustable bed frame 12. It should be noted that in this embodiment, the motor 211 is installed at one end of the sliding surface of the guide rail away from the hinge of the adjustable bed frame 12. The lead screw 212 is a push rod. The motor 211 drives the lead screw 212 to drive the sliding member 22 away from the motor 211, thereby driving the adjustable bed frame 12 to rotate. Of course, it can be understood that in other embodiments, the motor 211 can also be installed at one end of the sliding surface of the guide rail close to the hinge of the adjustable bed frame 12. In this embodiment, the lead screw 212 is a pull rod. The motor 211 drives the lead screw 212 to drive the sliding member 22 close to the motor 211, thereby driving the adjustable bed frame 12 to rotate.

[0072] In order to reduce the space occupied by the fixed bracket, in this embodiment, the pushing and pulling direction of the linear actuator 21 is parallel to the longitudinal direction of the fixed bed frame 11. The linear brake is within the thickness range of the fixed bed frame 11. The linear actuator 21 is within the thickness range of the fixed bed frame 11, making the connection structure between the fixed bed frame 11 and the linear actuator 21 more compact. Moreover, the installation of the linear actuator 21 does not affect the thickness of the fixed bed frame 11, which helps to reduce the thickness of the overall adjustable bed frame when the adjustable bed frame 12 is in a flat state. Furthermore, it can reduce the packaging size of the adjustable bed frame, which is beneficial to the transportation and storage of the adjustable bed frame. In addition, the sliding member 22 slides along the longitudinal direction of the fixed bed frame 11 under the drive of the linear actuator 21. The sliding member 22 acts on the primary lifting mechanism and the secondary lifting mechanism to rotate towards the upper side of the fixed bed frame 11. Therefore, during the rotation of the adjustable bed frame 12, the linear actuator 21 and the sliding member 22 will not protrude towards the bottom of the fixed bed frame 11. That is, the adjustable bed frame will not affect the space below the fixed bed frame 11 during use. There is no need to reserve space below the fixed bed frame 11 during installation, making the installation of the adjustable bed frame simpler and more convenient, and also being able to reduce the installation space of the adjustable bed frame.

[0073] In the present embodiment, during the process that the linear actuator 21 pushes the sliding member 22 to slide from the initial position towards the first support 121, the sliding member 22 drives the first pushing portion to move below the first support 121, so that the first pushing portion abuts against the slope surface of the first support 121. The height of the first support 121 gradually increases as it moves away from the sliding member 22. Therefore, the first pushing portion pushes the first support 121 to gradually lift along the slope surface, and the adjustable bed frame 12 rotates relative to the fixed bed frame 11 along with the first support 121. That is, the cooperation between the first pushing portion and the first support 121 can lift the adjustable bed frame 12 from the lying state. During this lifting process, the sliding member 22 forms a support for the adjustable bed frame 12 through the first pushing portion. At this time, the component force of the force received by the sliding member 22 in the vertical direction is greater than the component force in the horizontal direction, and the fixed bed frame 11 can form a support for the sliding member 22 and thus disperse the component force of the sliding member 22 in the vertical direction. Therefore, when the linear actuator 21 drives the sliding member 22 to slide, it only needs to overcome the component force of the sliding member 22 in the horizontal direction and the friction force between the sliding member 22 and the fixed support, without having to overcome the weight of the entire adjustable bed frame 12. Therefore, the thrust required to be output by the linear actuator 21 can be greatly reduced, which helps to extend the service life of the linear actuator 21. At the same time, it can also enable the linear actuator 21 to push a larger load and increase the maximum load of the adjustable bed frame.

[0074] In order to reduce the friction force between the first pushing portion and the first support 121, in the present embodiment, the first pushing portion is a first roller 223 rotatably connected to the sliding member 22. The first roller 223 is located at the top of the sliding member 22 close to the first support 121. Using the first roller 223 can form a rolling friction between the sliding member 22 and the first support 121, thereby reducing the friction force between the sliding member 22 and the first support 121, and further reducing the thrust required to be output by the linear actuator 21 when the adjustable bed frame 12 is lifted.

[0075] Such as Figure 2 and Figure 3As shown, in this embodiment, the left end of the second driven bracket 23 is pivotally connected to the fixed bed frame 11, the right end of the second driven bracket 23 is pivotally connected to the second driving bracket 24, and a second roller 233 is rotatably connected to the right end of the second driven bracket 23. The sliding member 22 has a stepped portion. When the sliding is in the initial position, the bottom end of the second roller 233 is lower than the surface of the stepped surface. During the first stroke of the sliding member 22, the end of the stepped portion will contact the second roller 233, and the second roller 233 will be lifted by the curved surface of the second roller 233, so that the bottom end of the second roller 233 is placed on the surface of the stepped portion, causing the second driving bracket 24 and the second driven bracket 23 to be pre-lifted. At this time, the end of the second driven bracket 23 pivotally connected to the second driving bracket 24 is also lifted under the drive of the second roller 233, so that the pivot joint of the second driving bracket 24 and the second driven bracket 23 is higher than the end of the second driving bracket 24 connected to the second pushing portion, that is, the left end of the second driving bracket 24 is higher than the right end of the second driving bracket 24. At this time, the second driving bracket 24 is in an inclined state, that is, an included angle is formed between the second driving bracket 24 and the fixed bed frame 11.

[0076] Of course, it can be understood that when the sliding member 22 is in the initial position, a reserved inclination angle has already been formed between the second driving bracket 24 and the fixed bed frame 11. When the second roller 233 is lifted by the second guide rail, the inclination angle between the second driving bracket 24 and the fixed bed frame 11 can become larger, and then the thrust required to push the second driving bracket 24 by the second pushing portion is smaller, which helps to reduce the thrust required to be output by the linear actuator 21.

[0077] Such as Figures 2 to 4As shown in the figure, in this embodiment, a strip-shaped guiding hole is formed in the sliding member 22 along its linear movement direction. The right end of the guiding hole constitutes a second pushing portion. The second pushing portion includes a slide rail. The length direction of the slide rail guiding hole 221 is parallel to the longitudinal length direction of the fixed bed frame 11. A rotating shaft guide shaft is provided at the right end of the second active bracket 24. The rotating shaft guide shaft passes through the slide rail guiding hole 221 and forms a sliding fit with the slide rail guiding hole 221. When the sliding member 22 is in the initial position, the right end of the second active bracket 24 is at the leftmost end of the slide rail guiding hole 221, that is, the end of the slide rail guiding hole 221 close to the second driven bracket 23. When the linear actuator 21 drives the sliding member 22 to slide in the first stroke, the sliding member 22 and the second active bracket 24 form a relative slide. The second active bracket 24 slides along the chute. The right end of the second active bracket 24 slides from the left end of the slide rail guiding hole 221 to the right end of the slide rail of the second pushing portion. When the sliding member 22 enters the starting point of the second stroke, at this time, the second pushing portion of the slide rail forms a limit on the right end of the second active bracket 24, and the groove wall of the right end of the slide rail of the second pushing portion is an arc adapted to the rotating shaft guide shaft. After the rotating shaft guide shaft abuts against the right end of the slide rail of the second pushing portion, the rotating shaft guide shaft and the second pushing portion of the slide rail form a rotational fit, that is, the second active bracket 24 and the sliding member 22 form a pivot connection. During the process of the sliding member 22 continuing to slide, the sliding member 22 will apply a horizontal thrust to the right end of the second active bracket 24, causing the second active bracket 24 to gradually rotate upward around the rotating shaft guide shaft. The second active bracket 24 drives the second driven bracket 23 to rise synchronously.

[0078] It should be noted that when the second active bracket 24 abuts against the right end of the slide rail of the second pushing portion, the adjustable bed frame 12 has not reached the first inclination angle, that is, the first roller 223 has not reached the lowest position of the slope and the first roller 223 has not separated from the first bracket 121. At this time, the sliding member 22 still supports the adjustable bed frame 12 through the first roller 223, that is, there is basically no force between the secondary lifting mechanism and the adjustable bed frame 12 at this time. Therefore, the second active bracket 24 can easily drive the second driven bracket 23 to lift, and continuously increase the inclination angle between the second active bracket 24 and the fixed bed frame 11. During the process of the second pushing portion driving the inclination angle of the second active bracket 24 to gradually increase through the horizontal thrust, the smaller the inclination angle of the second active bracket 24, the greater the horizontal thrust required for the sliding member 22. In the stage where the inclination angle of the second active bracket 24 is small, the adjustable bed frame 12 is supported by the first roller 223, and there is basically no force between the secondary lifting mechanism and the adjustable bed frame 12. Therefore, the resistance received during the rotation of the second active bracket 24 and the second driven bracket 23 is also very small. The resistance of the second active bracket 24 to the sliding member 22 is much smaller than the resistance of the adjustable bed frame 12 to the sliding member 22. Therefore, the rotation of the second active bracket 24 in this stage will not impose an additional burden on the linear actuator 21, enabling the linear actuator 21 to still maintain a small thrust output.

[0079] As Figure 4 shown, in this embodiment, when the first roller 223 is at the lowest position of the slope of the first bracket 121, the adjustable bed frame 12 is lifted to the first inclination angle. When the first roller 223 is about to leave the slope, at this time, the second active bracket 24 has formed a large inclination angle under the push of the second pushing part, and the right end of the second driven bracket 23 is also lifted by the second active bracket 24. After the first roller 223 leaves the slope, the sliding member 22 enters the second stroke. The second active bracket 24 supports the adjustable bed frame 12 through the second driven bracket 23. At this time, the support of the sliding member 22 for the adjustable bed frame 12 is transferred from the first roller 223 to the second active bracket 24. Since the first stroke and the second stroke of the sliding member 22 are successive and continuous in the same direction, before the adjustable bed frame 12 reaches the first inclination angle, the second active bracket 24 has already supported the second driven bracket 23. Therefore, the transfer of the support point can be made smoother, enabling the adjustable bed frame 12 to be lifted smoothly and avoiding the possibility of a sudden drop of the adjustable bed frame 12, which helps to improve the user experience. In addition, when the first roller 223 leaves the slope of the first bracket 121, due to the large inclination angle of the second active bracket 24, the horizontal component of the force received by the second active bracket 24 is small. As the sliding member 22 continues to slide, the horizontal component of the force received by the second active bracket 24 will gradually decrease. The linear actuator 21 only needs to overcome the horizontal component of the force received by the sliding member 22 and the friction between the sliding member 22 and the fixed bed frame 11 to drive the sliding member 22 to slide, without having to overcome the weight of the entire adjustable bed frame 12. Therefore, the linear actuator 21 only needs to output a small thrust to push a larger load, which can increase the maximum load of the adjustable bed frame and also extend the service life of the linear actuator 21.

[0080] As Figure 4 and Figure 5As shown, in the second stroke of the sliding member 22 in this embodiment, the second pushing portion pushes the second driven bracket 23 to lift through the second active bracket 24. The second roller 233 at the right end of the second driven bracket 23 abuts against the adjustable bed frame 12, thereby lifting the adjustable bed frame 12 to the second inclination angle. Since the pivoting joints of the second driven bracket 23 and the adjustable bed frame 12 do not coincide, when the second driven bracket 23 drives the adjustable bed frame 12 to rotate, the contact point between the second driven bracket 23 and the adjustable bed frame 12 is constantly changing. The second roller 233 is rotatably connected to the right end of the second driven bracket 23, and the second driven bracket 23 abuts against the adjustable bed frame 12 through the second roller 233, which can form a rolling friction between the second driven bracket 23 and the adjustable bed frame 12. Furthermore, the friction force between the second driven bracket 23 and the adjustable bed frame 12 can be reduced, and thus the thrust required to be output by the linear actuator 21 can be reduced. At the same time, the possibility of wear between the second driven bracket 23 and the adjustable bed frame 12 can also be reduced, which helps to extend the service life of the second driven bracket 23 and the adjustable bed frame 12.

[0081] In this embodiment, when the adjustable bed frame 12 is at the first inclination angle, the first pushing portion separably supports the first bracket 121. When the adjustable bed frame 12 is at the second inclination angle, the second pushing portion separably supports the second active bracket 24, so that the adjustable bed frame 12 descends by its own weight instead of being forced to drive by the descending torque of the linear actuator 21. When the adjustable bed frame 12 descends from the second inclination angle and the sliding member 22 slides reversely under the drive of the linear actuator 21, the second pushing portion will be separated from the second active bracket 24, thereby blocking the power transmission between the linear actuator 21 and the second active bracket 24, and enabling the adjustable bed frame 12 to descend only by gravity. During the descending process, the friction force between the sliding member 22 and the fixed bed frame 11 will also form a resistance to the descent of the adjustable bed frame 12, further slowing down the descending speed of the adjustable bed frame 12. If the user's finger is clamped between the adjustable bed frame 12 and the fixed bed frame 11, the force received by the finger is less than the force generated by the weight of the adjustable bed frame 12, reducing the harm to the finger or other limbs, which helps to improve the use safety of the electric bed frame; similarly, when the adjustable bed frame 12 descends from the first inclination angle, after the linear brake drives the sliding member 22 to slide, the first pushing portion will also be separated from the first bracket 121, thereby blocking the power transmission between the linear actuator 21 and the first bracket 121.

[0082] In this embodiment, a support frame 111 is provided along the longitudinal direction of the fixed bed frame 11. The support frame 111 includes a bottom plate 1111 for supporting the sliding member 22 and side plates 1112 for restricting the sliding direction of the sliding member 22. The upper surface of the bottom plate 1111 forms the sliding surface. A sliding pad 226 for reducing friction is provided at the bottom of the sliding member 22. The sliding member 22 is slidably engaged with the fixed bed frame 11 through the sliding pad 226. A part of the sliding pad 226 extends between the sliding member 22 and the side plates 1112. Both sides of this part of the sliding pad 226 are in contact with the side wall of the sliding member 22 and the side plates 1112 respectively. By means of the sliding pad 226, the friction between the sliding member 22 and the fixed bed frame 11 can be effectively reduced. During the lifting process of the adjustable bed frame 12, the linear actuator 21 needs to overcome the horizontal component force received by the sliding member 22 and the friction between the sliding member 22 and the fixed bed frame 11. After the friction is reduced, the thrust required to be output by the linear actuator 21 can be further reduced, enabling the linear actuator 21 to push a larger load, which helps to increase the maximum load of the adjustable bed frame 12. Secondly, since a part of the sliding pad 226 is located between the sliding member 22 and the side plates 1112, direct contact between the sliding member 22 and the side plates 1112 can be avoided, reducing the possibility of wear on the side wall of the sliding member 22. At the same time, the friction between the sliding member 22 and the side plates 1112 can also be reduced. Additionally, by filling a part of the sliding pad 226 between the sliding member 22 and the side plates 1112, the sliding pad 226 and the side plates 1112 can restrict the sliding direction of the sliding member 22, ensuring that the sliding member 22 can slide along the longitudinal direction of the fixed bed frame 11, preventing the sliding member 22 from shifting or swaying in the width direction of the fixed bed frame 11, so that the sliding of the sliding member 22 is more stable and reliable.

[0083] Of course, it can be understood that in other embodiments, the sliding pad 226 can also be fixed on the sliding surface.

[0084] Of course, it can be understood that in other embodiments, rolling friction can also be formed between the sliding member 22 and the sliding surface.

[0085] In this embodiment, the brackets of each stage of the lifting mechanism are two support rods in pairs, and the two support rods are spaced apart in the width direction of the fixed bed frame 11. That is, the first-stage lifting mechanism has two first brackets 121, the second-stage lifting mechanism has two second driven brackets 23 and two second driving brackets 24. In order to ensure that the two second driven brackets 23 can rotate synchronously, in this embodiment, the two second driven brackets 23 are of an integral structure, and the second driving brackets 24 are respectively pivotally connected to both sides of the second driven brackets 23. Correspondingly, in this embodiment, the sliding member 22 is provided with two first pushing portions corresponding to the first brackets 121 and two second pushing portions corresponding to the second driving brackets 24. Using brackets arranged in pairs can increase the support positions of the lifting mechanism on the adjustable bed frame 12, make the support of the lifting mechanism on the adjustable bed frame 12 more stable, and reduce the possibility of the adjustable bed frame 12 swinging or shaking during the lifting process; in addition, it can also reduce the pressure on each support rod and reduce the possibility of the support rod deforming or breaking.

[0086] In order to reduce the friction between the sliding member 22 and the fixed bed frame 11, in this embodiment, the bottom of the sliding member 22 is provided with a sliding pad 226 for reducing friction. The sliding member 22 is slidably engaged with the fixed bed frame 11 through the sliding pad 226. The sliding pad 226 can effectively reduce the friction between the sliding member 22 and the fixed bed frame 11. During the lifting process of the adjustable bed frame 12, the linear actuator 21 needs to overcome the horizontal component force received by the sliding member 22 and the friction between the sliding member 22 and the fixed bed frame 11. After the friction is reduced, the thrust required to be output by the linear actuator 21 can be further reduced, enabling the linear actuator 21 to push a larger load, which helps to increase the maximum load of the adjustable bed. Of course, it can be understood that in other embodiments, rolling friction may also be formed between the sliding member 22 and the fixed bed frame 11. Rolling friction helps to reduce the possibility of the sliding member 22 and the fixed bed frame 11 being damaged due to friction and can effectively extend the service life of the sliding member 22 and the fixed bed frame 11.

[0087] Embodiment Two:

[0088] As Figures 7 to 19As shown, the main difference between this embodiment and the first embodiment is that the lifting mechanism in this embodiment further includes a three - stage lifting mechanism. The three - stage lifting mechanism includes a third driving bracket 25 and a third driven bracket 231. The third driven bracket 231 is a part of the second driven bracket 23. The second driven bracket 23 further includes a connecting rod 232. One end of the connecting rod 232 is pivotally connected to the right end of the third driven bracket 231, and the other end is pivotally connected to the second driving bracket 24. The third driving bracket 25 is pivotally connected to the middle of the third driven bracket 231. The sliding member 22 has a third pushing portion. The third stroke of the sliding member 22 causes the third pushing portion to push the third driving bracket 25 to lift the adjustable bed frame 12 to the third inclination angle. The third stroke and the second stroke are successive and continuous in the same direction. During the third stroke of the sliding member 22, the third pushing portion pushes the third driving bracket 25 to rotate. During the rotation of the third driving bracket 25, it drives the third driven bracket 231 to rotate around the fixed bed frame 11. The third driven bracket 231 supports the adjustable bed frame 12 and lifts the adjustable bed frame 12 to the third inclination angle. As the sliding member 22 slides, the inclination angle of the third driving bracket 25 gradually increases under the action of the third pushing portion. Therefore, the horizontal component force of the third driving bracket 25 acting on the third pushing portion will gradually decrease. And the linear actuator 21 only needs to overcome the horizontal component force received by the sliding member 22 and the frictional force between the sliding member 22 and the fixed bed frame 11 to drive the sliding member 22 to slide, without having to overcome the weight of the entire adjustable bed frame 12. Therefore, the linear actuator 21 still only needs to output a relatively small thrust to push a larger load, which can increase the maximum load of the electric bed frame and also extend the service life of the linear actuator 21.

[0089] The angle by which the adjustable bed frame 12 is lifted during the third stroke is greater than the angle by which the adjustable bed frame 12 is lifted during the second stroke, and the angle by which the adjustable bed frame 12 is lifted during the third stroke is greater than the angle by which the adjustable bed frame 12 is lifted during the first stroke. Using the third stroke of the sliding member 22 can greatly increase the adjustment range of the adjustable bed frame 12 and can adapt to various different needs of users. Additionally, as the inclination angle of the adjustable bed frame 12 continuously increases, the thrust required for the linear actuator 21 to push the sliding member 22 will gradually decrease. And at the start of the third stroke, the inclination angle of the adjustable bed frame 12 is already relatively large. Therefore, during the third stroke of the sliding member 22, the thrust required to be output by the linear actuator 21 is relatively small, that is, the linear actuator 21 still only needs to output a relatively small thrust to achieve a large - range angle adjustment of the adjustable bed frame 12.

[0090] As Figures 7 to 9As shown, in this embodiment, when the sliding member 22 is in the initial position, the left end of the third active bracket 25 is pivotally connected to the third driven bracket 231. The right end of the third active bracket 25 naturally droops and extends towards the sliding member 22. At this time, the right end of the third active bracket 25 is placed on the guide rail of the fixed bed frame 11, and the third active bracket 25 is separated from the sliding member 22.

[0091] As Figure 9 shown, in order to enable the secondary lifting mechanism to be pre-lifted during the first stroke of the sliding member 22, in this embodiment, a convex block 2321 protruding towards the fixed bed frame 11 is provided at the end of the connecting rod 232 pivotally connected to the second active bracket 24. A guiding surface 2322 is provided on the side of the convex block 2321 facing the sliding member 22. When the sliding is in the initial position, the bottom end of the convex block 2321 is lower than the surface of the stepped surface. During the first stroke of the sliding member 22, the end of the stepped portion will contact the guiding surface 2322 and lift the convex block 2321 through the guiding surface 2322, so that the bottom end of the convex block 2321 is placed on the surface of the stepped portion, causing the connecting rod 232 and the second active bracket 24 to be pre-lifted. At this time, the end of the second driven bracket 23 pivotally connected to the second active bracket 24 is also lifted under the drive of the convex block 2321, so that the pivot joint of the second active bracket 24 and the second driven bracket 23 is higher than the end of the second active bracket 24 connected to the second pushing portion, that is, the left end of the second active bracket 24 is higher than the right end of the second active bracket 24. At this time, the second active bracket 24 is in an inclined state, that is, an included angle is formed between the second active bracket 24 and the fixed bed frame 11, realizing the pre-lifting of the second active bracket 24.

[0092] It should be noted that the convex block 2321 and the connecting rod 232 are of an integral structure; in addition, when the sliding member 22 is in the initial position, the bottom end of the convex block 2321 is the lowest position of the connecting rod 232, and the height difference between the bottom end of the convex block 2321 and the highest position of the connecting rod 232 is less than the thickness of the fixed bed frame 11 to prevent the connecting rod 232 from interfering with the lying flat of the adjustable bed frame 12; secondly, in this embodiment, when the sliding member 22 is in the initial position, the second active bracket 24 can also be in an inclined state, that is, the left end of the second active bracket 24 is higher than the right end of the second active bracket 24. In the initial position, the second active bracket 24 forms a reserved inclined angle with the fixed bed frame 11. When the convex block 2321 is lifted by the stepped portion, the inclined angle between the second active bracket 24 and the fixed bed frame 11 can become larger, and then the thrust required for the sliding member 22 to push the second active bracket 24 is smaller, which helps to reduce the thrust required to be output by the linear actuator 21.

[0093] Of course, it can be understood that in other embodiments, the convex block 2321 can also be provided at the end of the second active bracket 24.

[0094] AsFigures 10 to 14 As shown, in this embodiment, when the adjustable bed frame 12 reaches the first inclination angle and the first roller 223 of the sliding member 22 reaches the position where the first support 121 is about to disengage from the lowest position of the slope, the second pushing portion pushes the second active support 24 to lift. The second active support 24 drives the connecting rod 232 to lift and abuts against the adjustable bed frame 12. The sliding member 22 forms a support for the connecting rod 232 through the second active support 24. A limiting plate 2311 is provided on the side of the third driven support 231 facing the adjustable bed frame 12. The left end of the connecting rod 232 extends below the limiting plate 2311. When the right end of the connecting rod 232 receives an upward thrust from the second active support 24, the connecting rod 232 abuts against the limiting plate 2311. At this time, the third driven support 231 and the connecting rod 232 can be regarded as a complete second driven support 23, that is, the second active support 24 drives the second driven support 23 to rotate upward. The limiting plate 2311 can limit the rotation of the connecting rod 232 toward the adjustable bed frame 12. During the second stroke of the sliding member 22, the second active support 24 pushes the connecting rod 232, and the connecting rod 232 drives the third driven support 231 to lift synchronously through the limiting plate 2311. At this time, the connecting rod 232 and the limiting plate 2311 form a stable whole, so that the support between the second active support 24 and the connecting rod 232 is stable and reliable, and the adjustable bed frame 12 can rise smoothly, which helps to improve the user experience.

[0095] In order to reduce the possibility of wear between the connecting rod 232 and the adjustable bed frame 12, in this embodiment, the side of the right end of the connecting rod 232 facing the adjustable bed frame 12 is a curved surface. The curved surface can reduce the contact area between the connecting rod 232 and the adjustable bed frame 12. Since the pivoting points of the second driven support 23 and the adjustable bed frame 12 do not coincide, when the second driven support 23 drives the adjustable bed frame 12 to rotate, the contact point between the connecting rod 232 and the adjustable bed frame 12 is constantly changing, that is, there will be sliding friction between the connecting rod 232 and the adjustable bed frame 12. Reducing the contact area between the connecting rod 232 and the adjustable bed frame 12 can reduce the friction force between the connecting rod 232 and the adjustable bed frame 12, and further reduce the thrust required to be output by the linear actuator 21. At the same time, it can also reduce the possibility of wear between the connecting rod 232 and the adjustable bed frame 12, which helps to extend the service life of the connecting rod 232 and the adjustable bed frame 12.

[0096] As Figure 12 、 Figure 15 and Figure 16As shown, in this embodiment, the third pushing part is a horizontally arranged hinge shaft 225. The axial direction of the hinge shaft 225 is perpendicular to the sliding direction of the sliding member 22. A clamping groove 251 is provided at the end of the third driving bracket 25 close to the sliding member 22. A notch is formed on the side of the clamping groove 251 facing the sliding member 22. During the second stroke of the sliding member 22, the right end of the third driving bracket 25 is not stressed, droops naturally and is placed on the guide rail. The notch is aligned with the hinge shaft 225. The overall notch is a flared opening, that is, the width of the notch gradually increases as it moves away from the clamping groove 251, and the width of the notch on the edge of the third driving bracket 25 is greater than the diameter of the hinge shaft 225. Thus, it can be ensured that the hinge shaft 225 can enter the clamping groove 251 through the notch. When the adjustable bed frame 12 reaches the second inclination angle, the hinge shaft 225 is embedded in the clamping groove 251, and the hinge shaft 225 forms a hinge with the third driving bracket 25, avoiding the jamming phenomenon between the hinge shaft 225 and the third driving bracket 25.

[0097] In addition, when the adjustable bed frame 12 is at the third inclination angle, the third pushing part separably supports the third driving bracket 25, enabling the adjustable bed frame 12 to descend by its own weight rather than being forced to drive by the descending torque of the linear actuator 21. When the adjustable bed frame 12 descends from the third inclination angle and the sliding member 22 slides reversely under the drive of the linear actuator 21, the third pushing part will be separated from the third driving bracket 25. Thus, the power transmission between the linear actuator 21 and the third driving bracket 25 can be blocked, enabling the adjustable bed frame 12 to descend only by gravity. During the descending process, the frictional force between the sliding member 22 and the fixed bed frame 11 will also form a resistance to the descent of the adjustable bed frame 12, further slowing down the descending speed of the adjustable bed frame 12. If a user's finger is clamped between the adjustable bed frame 12 and the fixed bed frame 11, the force exerted on the finger will be less than the force generated by the weight of the adjustable bed frame 12, reducing the harm to the finger or other limbs and helping to improve the safety of using the electric bed frame.

[0098] As Figure 17 and Figure 18As shown, in the second stroke of the sliding member 22 in this embodiment, the sliding member 22 generates a horizontal thrust on the second active bracket 24 and causes the right end of the second active bracket 24 to rotate upward around the rotating shaft guide axis. While the second active bracket 24 rotates, it drives the third driven bracket 231 and the connecting rod 232 to rotate upward, so that the right end of the connecting rod 232 abuts against the adjustable bed frame 12. During the upward rotation of the third driven bracket 231, it drives the right end of the third active bracket 25 to rise, making the third active bracket 25 as a whole inclined, that is, the left end of the third active bracket 25 is higher than the right end of the third active bracket 25. As the third driven bracket 231 continues to rise, the left end of the third active bracket 25 also continues to rise, and the angle between the third active bracket 25 and the fixed bed frame 11 gradually increases. When the adjustable bed frame 12 reaches the second inclination angle, the hinge shaft 225 enters the card slot 251, and the sliding member 22 generates a force on the right end of the third active bracket 25 through the hinge shaft 225. At this time, the inclination angle of the second active bracket 24 is close to 90°, and it is difficult for the second active bracket 24 to continue to lift the adjustable bed frame 12. The sliding member 22 forms a support for the third driven bracket 231 through the third active bracket 25, so that the third driven bracket 231 abuts against the adjustable bed frame 12. The support of the sliding member 22 for the adjustable bed frame 12 is transferred from the second active bracket 24 to the third active bracket 25. Since before the adjustable bed frame 12 reaches the second inclination angle, the third driven bracket 231 has already lifted the left end of the third active bracket 25, making a large inclination angle formed between the third active bracket 25 and the guide rail. When the sliding member 22 forms a support for the adjustable bed frame 12 through the third active bracket 25, part of the force is dispersed in the vertical direction and supported by the fixed bed frame 11, and the linear actuator 21 still only needs to overcome the horizontal component force received by the sliding member 22 and the friction between the sliding member 22 and the guide rail, without bearing the weight of the entire adjustable bed frame 12, so that the linear actuator 21 can still maintain a low thrust output. In the third stroke of the sliding member 22, the sliding member 22 generates a horizontal thrust on the third active bracket 25, making the inclination angle of the third active bracket 25 continuously increase. At this time, the horizontal component force received by the sliding member 22 will continuously decrease, and there is no need to increase the thrust output by the linear actuator 21 during the subsequent lifting process of the adjustable bed frame 12. As the adjustable bed frame 12 continues to rise, the distance between the second active bracket 24 and the third driven bracket 231 gradually increases. After that, the connecting rod 232 and the limiting plate 2311 are separated from each other, and the connecting rod 232 rotates relative to the third driven bracket 231 to the fixed bed frame 11, and the angle between the connecting rod 232 and the second active bracket 24 gradually increases. The connecting rod 232 can keep the second active bracket 24 and the third driven bracket 231 still connected, ensuring that the linear actuator 21 can be used repeatedly. At the same time, the connecting rod 232 can increase the distance between the third driven bracket 231 and the second active bracket 24, thereby avoiding the rotation of the second active bracket 24 from restricting the adjustable bed frame 12.Enabling the adjustable bed frame 12 to have a larger rotation angle helps to increase the applicable range of the adjustable bed frame.

[0099] In this embodiment, the three-stage lifting mechanism also has two third driving brackets 25, which are spaced apart in the width direction of the fixed bed frame 11. The sliding member 22 is correspondingly provided with two third pushing portions, which are respectively located on both sides of the sliding member 22.

[0100] As Figure 19 shown, in this embodiment, the fixed bed frame 11 is provided with two adjustable bed frames 12 rotatably connected thereto along its longitudinal direction. The two adjustable bed frames 12 are respectively pivotally connected to the fixed bed frame 11 at their ends close to each other. The two adjustable bed frames 12 respectively include a backrest and a leg plate. The backrest is located at the head of the adjustable bed frame and is used to lift the user's back, and the leg plate is located at the leg of the adjustable bed frame and is used to lift the user's legs. The backrest and the leg plate are distributed along the length direction of the fixed bed frame 11. The ends of the backrest and the leg plate close to each other are hinged to the fixed bed frame 11. The fixed bed frame 11 is provided with two linear actuators 21, two sliding members 22 and two lifting mechanisms. The two lifting mechanisms independently drive the adjustable bed frame 12 to lift. One linear actuator 21 drives the sliding member 22 to slide and controls the backrest to rotate through the lifting mechanism. The lifting mechanism adopts the lifting mechanism described in this embodiment, that is, the lifting mechanism includes a primary lifting mechanism, a secondary lifting mechanism and a tertiary lifting mechanism. The other linear actuator 21 drives the sliding member 22 to slide and controls the leg plate to rotate through the lifting mechanism. The lifting mechanism adopts the lifting mechanism described in Embodiment 1, that is, the lifting mechanism only includes a primary lifting mechanism and a secondary lifting mechanism.

[0101] In addition, it should be noted that in this embodiment, the leg plate includes a first leg plate 13 and a second leg plate 14. One end of the first leg plate 13 close to the backrest is rotatably connected to the fixed bed frame 11, and the other end is hinged to the second leg plate 14. The side plate 1112 of the second leg plate 14 is connected to the fixed bed frame 11 through a hinge rod. The linear actuator 21 for driving the leg plate acts on the first leg plate 13 and is used to drive the first leg plate 13 to rotate around the fixed bed frame 11. When the first leg plate 13 reaches the maximum rotation state, the first leg plate 13 and the second leg plate 14 form an inverted V shape.

[0102] Embodiment Two:

[0103] This embodiment shows an electric bed, including an adjustable bed frame. The adjustable bed frame includes a fixed bed frame 11, an adjustable bed frame 12 pivotally connected to the fixed bed frame 11, and a lifting mechanism for driving the adjustable bed frame 12 to flip relative to the fixed bed frame 11. A driving device for driving the adjustable bed frame 12 to flip relative to the fixed bed frame 11 to change the inclination angle is installed on the fixed bed frame 11. The adjustable bed frame adopts the adjustable bed frame described in Embodiment 1 or Embodiment 2.

[0104] As mentioned above, the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. Adjustable bed frame, characterized in that: include: A fixed bed frame is provided with a linear actuator and a sliding component, the sliding component is slidably supported on the fixed bed frame, the linear actuator drives the sliding component to perform reciprocating linear motion along the longitudinal direction of the fixed bed frame, and the sliding component has a first pushing portion and a second pushing portion; An adjustable bed frame, which is pivotally connected to the fixed bed frame and can be flipped relative to the fixed bed frame to change the tilt angle; The lifting mechanism comprises a primary lifting mechanism and a secondary lifting mechanism, wherein the primary lifting mechanism comprises a first bracket fixed to the adjustable bed frame, the first bracket having a slope; the secondary lifting mechanism comprises a second active bracket and a second passive bracket, one end of the second passive bracket is pivotally connected to the fixed bed frame, and the other end is pivotally connected to the second active bracket; Among them, the first stroke of the sliding component causes the first pushing part to push the first bracket along the slope to lift the adjustable bed frame to a first inclination angle, and the second stroke of the sliding component causes the second pushing part to push the second active bracket to lift the adjustable bed frame to a second inclination angle, and the first stroke and the second stroke are successive and continuous in the same direction.

2. The adjustable bed frame according to claim 1, characterized in that: The sliding component pushes the secondary lifting mechanism to pre-lift in the first stroke, and the pre-lift of the secondary lifting mechanism causes the second active support to tilt relative to the fixed bed frame or increases the tilt angle of the second active support.

3. The adjustable bed frame according to claim 2, characterized in that: The second active bracket or the second driven bracket is provided with a protrusion extending toward the fixed bed frame, and a guide surface is provided on the side of the protrusion facing the sliding component. The sliding component has a step portion. In the first stroke, the step portion pushes the protrusion to lift along the guide surface to pre-lift the secondary lifting mechanism.

4. The adjustable bed frame according to claim 1, characterized in that: When the adjustable bed frame is at a first tilt angle, the first pushing portion detachably supports the first bracket, and when the adjustable bed frame is at a second tilt angle, the second pushing portion detachably supports the second active bracket, so that the adjustable bed frame descends by its own weight rather than being forcibly driven by the descending torque of the linear actuator.

5. The adjustable bed frame according to claim 4, characterized in that: The first pushing portion is a first roller rotatably connected to the sliding component.

6. The adjustable bed frame according to claim 4, characterized in that: The sliding component is provided with a strip-shaped guide hole along its linear movement direction, one end of the guide hole constitutes a second pushing part, and the second active bracket is provided with a guide shaft at one end away from its pivot point. The guide shaft is inserted into the guide hole and slides relative to the guide hole along with the first stroke of the sliding component, and the second stroke starts at the moment when the guide shaft and the second pushing part are against each other.

7. The adjustable bed frame according to claim 1, characterized in that: The lifting mechanism also includes a three-stage lifting mechanism, which includes a third active bracket and a third driven bracket. The third driven bracket is pivotally connected to the fixed bed frame and the third active bracket respectively. The sliding component has a third pushing part. The third stroke of the sliding component causes the third pushing part to push the third active bracket to lift the adjustable bed frame to a third inclination angle. The third stroke and the second stroke are successive and continuous in the same direction.

8. The adjustable bed frame according to claim 7, characterized in that: The angle at which the adjustable bed frame is lifted in the third stroke is greater than the angle at which the adjustable bed frame is lifted in the second stroke, and the angle at which the adjustable bed frame is lifted in the third stroke is greater than the angle at which the adjustable bed frame is lifted in the first stroke.

9. The adjustable bed frame according to claim 7, characterized in that: The sliding component pushes the three-stage lifting mechanism to pre-lift in the second stroke, and the pre-lifting of the three-stage lifting mechanism causes the third active support to increase the inclination angle relative to the fixed bed frame.

10. The adjustable bed frame according to claim 9, characterized in that: When the sliding component is in the second stroke, the third driven bracket is synchronously lifted along with the second driven bracket, and the third active bracket extends toward the sliding component at one end away from the third driven bracket and droops naturally.

11. The adjustable bed frame according to claim 7, characterized in that: When the adjustable bed frame is at the third tilt angle, the third pushing portion detachably supports the third active support, so that the adjustable bed frame descends by its own weight instead of being forcibly driven by the descending torque of the linear actuator.

12. The adjustable bed frame according to claim 11, characterized in that: The third pushing portion is a horizontally arranged hinge shaft, the axial direction of the hinge shaft is perpendicular to the sliding direction of the sliding component, and a slot is provided at the end of the third active bracket close to the sliding component, and a notch is formed on one side of the sliding component. In the third stroke, the hinge shaft is embedded in the slot and pivotally connected with the third active bracket.

13. The adjustable bed frame according to claim 7, characterized in that: The third driven bracket is a part of the second driven bracket. The second driven bracket also includes a connecting rod, one end of which is pivotally connected to the end of the third driven bracket and the other end is pivotally connected to the second active bracket. The third active bracket is pivotally connected to the middle part of the third driven bracket.

14. The adjustable bed frame according to claim 13, characterized in that: The third driven bracket is provided with a limit plate on the side facing the adjustable bed frame, and the connecting rod part is located at the lower side of the limit plate. In the second stroke, the sliding component pushes the connecting rod to resist the limit plate through the second active bracket. In the third stroke of the sliding component, the connecting rod rotates relative to the third driven bracket and the fixed bed frame, and the angle between the connecting rod and the second active bracket gradually increases.

15. The adjustable bed frame according to claim 7, characterized in that: The top end of the third driven bracket is rotatably connected to a second roller, and in the third stroke, the third driven bracket forms rolling friction with the adjustable bed frame through the second roller.

16. The adjustable bed frame according to claim 1, characterized in that: The push-pull direction of the linear actuator is parallel to the longitudinal direction of the fixed bed frame, and the linear brake is within the thickness range of the fixed bed frame.

17. The adjustable bed frame according to claim 1, characterized in that: The brackets of each level of the lifting mechanism are two supporting rods in pairs, and the two supporting rods are spaced apart in the width direction of the fixed bed frame.

18. The adjustable bed frame according to claim 1, characterized in that: The fixed bed frame is provided with a sliding surface along its longitudinal direction, and the sliding component slides along the sliding surface.

19. The adjustable bed frame according to claim 18, characterized in that: The fixed bed frame is provided with a support frame along its longitudinal direction. The support frame includes a bottom plate for supporting the sliding component and a side plate for limiting the sliding direction of the sliding component. The upper surface of the bottom plate forms the sliding surface.

20. The adjustable bed frame according to claim 19, characterized in that: A sliding pad for reducing friction is provided on the bottom or sliding surface of the sliding component. The sliding pad part extends between the sliding component and the side plate. Both sides of the sliding pad part are in contact with the side wall and the side plate of the sliding component respectively.

21. The adjustable bed frame according to claim 18, characterized in that: Rolling friction is formed between the sliding component and the sliding surface.

22. The adjustable bed frame according to claim 1, characterized in that: The fixed bed frame is provided with two sets of adjustable bed frames along its longitudinal direction, and the ends of the two sets of adjustable bed frames close to each other are respectively pivotally connected to the fixed bed frame, and the two sets of adjustable bed frames have opposite tilting directions. The adjustable bed frame has two sets of lifting mechanisms, and the two sets of lifting mechanisms independently drive the adjustable bed frame to lift.

23. The adjustable bed frame according to claim 1, characterized in that: The linear actuator includes a motor, a screw and a nut mounted on the screw. The motor is fixed to the fixed bed frame. The screw is distributed along the longitudinal direction of the fixed bed frame. The output end of the motor cooperates with the screw and drives the screw to rotate. The nut is fixedly connected to the sliding component.

24. An electric bed, comprising an adjustable bed frame, the adjustable bed frame comprising a fixed bed frame, an adjustable bed frame pivotally connected to the fixed bed frame, and a lifting mechanism for driving the adjustable bed frame to flip relative to the fixed bed frame, characterized in that: The adjustable bed frame adopts the adjustable bed frame according to any one of claims 1 to 23.

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