Electric adjustable multi-stage power assist support device

Abstract

This invention discloses an electrically adjustable multi-stage power-assisted support device, comprising a base frame, a support assembly, a guide block, an electric drive mechanism, and a support frame. The support frame has an elongated sliding hole. The support assembly includes a first support arm, a second support arm, and a third support arm. When the electric drive mechanism drives the first support arm to move towards the rotation connection point near the base frame, the third support arm moves synchronously in conjunction with it. The guide block has a guide surface. When the pushing part is raised upward with the first support arm to a first position, the limiting post on the third support arm slides to abut against the inner end of the sliding hole. As the pushing part continues to rise upward from the first position, the third support arm rotates in conjunction with it and provides power-assisted support to the support frame. This electrically adjustable multi-stage power-assisted support device is thin, small in size, and compact in its initial folded state, and provides power-assisted support, high load capacity, and good support stability in its unfolded state.

Description

Technical Field

[0001] This application relates to the field of electric furniture technology, specifically to an electrically adjustable multi-stage power assist support device. Background Technology

[0002] Electric beds, with their adjustable postures (lying down, sitting, etc.), can alleviate fatigue and are therefore very popular. To enable ordinary beds to also offer this adjustment function, electrically adjustable support devices, also known as backrest frames, are installed under the mattress. These are independently configured components. Users simply place the device on the frame under the mattress and adjust its height to adjust the height of the softer mattress above it, thus giving the ordinary bed a height-adjustable function.

[0003] The electrically adjustable support device of this related technology includes a fixed frame and a backrest support. One end of the backrest support is rotatably connected to one end of the fixed frame via a rotating shaft. The fixed frame is placed horizontally on the bed frame of a regular bed, and the backrest support can rotate relative to the fixed frame around the rotating shaft, allowing the height of the backrest support to be adjusted between an initial folded state and a final unfolded state. The electrically adjustable support device of this related technology also includes an electric push rod disposed between the fixed frame and the backrest support. One end of the electric push rod is hinged to the fixed frame, and the other end of the electric push rod is hinged to the backrest support, used to drive the rotation of the backrest support and support the load-bearing capacity of the backrest support, such as the backrest bed frame in the applicant's earlier application with publication number CN115500645A.

[0004] The electrically adjustable support device of the related technology has the following drawbacks in actual use: First, in order to ensure that the electric push rod can provide sufficient lift to the backrest support when it is unfolded from the initial folded state, the electric push rod is tilted when the backrest support is in the initial folded state, or / and the backrest support is tilted relative to the fixed frame when it is in the initial folded state. Therefore, the support device is thick, bulky, and not compact after folding, increasing packaging and transportation costs. Second, when the backrest support is unfolded under load, the rotational force of the backrest support is converted solely by the axial thrust of the electric push rod, so the load capacity of the support device of the related technology is too small. In addition, after the backrest support is unfolded, the support of the backrest support is entirely provided by the self-locking force of the electric push rod, resulting in poor support stability. Summary of the Invention

[0005] The technical problem to be solved by this application is to overcome the defects of the above-mentioned related technologies and provide an electrically adjustable multi-stage assist support device that is thin, small in size and compact in the initial folded state, and has assist support, large load and good support stability in the unfolded state.

[0006] The technical solution of this application is to provide an electrically adjustable multi-stage power assist support device having the following structure: it includes...

[0007] The base frame has a sliding groove extending along its length, and the base frame is provided with a rotating connection point;

[0008] A support frame has a connecting end, which is rotatably connected to the rotating connection point; an elongated sliding hole extending along the length of the support frame is provided on the support frame near the connecting end.

[0009] An electric drive mechanism is connected to the base frame;

[0010] A support assembly, with clearance fitting within the slide groove, comprises a first support arm, a second support arm, and a third support arm rotatably connected sequentially along the length of the slide groove. The first support arm is drive-connected to the electric drive mechanism, and the rotatable connection between the first and second support arms forms a pushing portion that contacts the back of the support frame. A limiting post with clearance fitting within the slide hole is connected to the third support arm, and when the electric drive mechanism drives the first support arm to move towards the rotatable connection point closer to the base frame, the third support arm moves synchronously in conjunction with it.

[0011] A guide block, connected to the base frame, has a guide surface configured to guide the first support arm to lift upward and cause the pusher to drive the support frame to rotate upward when the first support arm moves toward the rotation connection point of the base frame.

[0012] When the pusher is raised to the first position along with the first support arm, the limiting post on the third support arm slides to abut against the inner end of the sliding hole. As the pusher continues to rise from the first position, it rotates in conjunction with the third support arm and provides auxiliary support to the support frame.

[0013] In some embodiments, the lengths of the first support arm, the second support arm, and the third support arm are shortened sequentially, and when the support frame is rotated to its maximum angle, the first support arm is parallel to the third support arm, and the angle between the second support arm and the base frame is less than 90 degrees.

[0014] In some embodiments, a roller is connected at the rotatable connection between the first support arm and the second support arm, the outer edge of the roller being higher than the top plane of the first support arm or the second support arm, and the roller forming the pushing portion.

[0015] In some embodiments, the guide block has an inclined surface that rises from low to high along a first direction of the slide groove, the inclined surface forming the guide surface; wherein, the first direction is the direction in which the first support arm slides toward the base frame rotation connection point.

[0016] In some embodiments, a roller is connected to the bottom of the first support arm, and the roller is disposed on the side of the first support arm near the pushing part; when the support frame is in the lowest position, the roller is located at the lowest position of the guide surface.

[0017] In some embodiments, the first support arm between the roller and the pusher is provided with a clearance hole for the top of the guide block to extend into when the support frame is in its lowest position.

[0018] In some embodiments, a fixing frame is connected to the bottom of the support frame near its connecting end, and the fixing frame is provided with the elongated sliding hole extending along the length direction of the support frame.

[0019] In some embodiments, the connecting end of the support frame is provided with a limiting plate that bends toward the base frame, and when the support frame rotates to its maximum angle, the limiting plate abuts against the base frame.

[0020] In some embodiments, the support frame includes a top plate and two parallel branch pipes connected to the bottom of the top plate, forming a receiving cavity between the top plate and the two branch pipes. When the support frame is rotated to be parallel to the base frame, at least a portion of the base frame is located within the receiving cavity.

[0021] In some embodiments, the electric drive mechanism includes a drive motor and a lead screw that is rotatable along the length of the base frame. A transmission nut is threaded onto the lead screw, and the transmission nut is rotatably connected to the first support arm. The drive motor is driven by the lead screw.

[0022] In summary, compared with related technologies, the electrically adjustable multi-stage assist support device of this application has the following advantages: When the electric drive mechanism of the electrically adjustable multi-stage assist support device drives the first support arm to move along the length of the slide groove towards the rotation connection point near the base frame, the first support arm moves synchronously through the second support arm and the third support arm; under the guidance of the guide surface of the guide block, the end of the first support arm located at the pushing part is lifted upward, and the pushing part pushes the support frame to rotate upward; at this time, the guide surface of the guide block provides assistance for the lifting of the first support arm and the pushing part and The device provides support for the rotation of the support frame. When the pushing part is raised to the first position along with the first support arm, the limiting post on the third support arm slides to abut against the inner end of the sliding hole and is limited. In this state, the outer end of the third support arm tilts upward but does not provide support for the support frame. When the pushing part continues to rise from the first position, the first support arm disengages from the guide block. At this time, the first support arm is supported by the second support arm to rotate and lift upward. The second support arm rotates upward in conjunction with the outer end of the third support arm. Under the action of the second support arm, the third support arm provides auxiliary support to the support frame. Therefore, this electrically adjustable multi-stage auxiliary support device can provide multi-stage auxiliary support for the support frame and increase the load of the support device. That is, when the support frame is in the unfolded state, in addition to the supporting force of the first support arm, the third support arm also provides the supporting force of the support frame. Therefore, the electric adjustable multi-stage assist support device has a large load and good support stability. In addition, the support frame of the electric adjustable multi-stage assist support device can be relatively folded under the action of the electric drive mechanism, so that the electric adjustable multi-stage assist support device is thin, small in size and compact in the initial folded state. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of an electrically adjustable multi-stage assist support device according to some embodiments of this application.

[0024] Figure 2 This is a schematic diagram of the assembly structure of an electrically adjustable multi-stage assist support device according to some embodiments of this application.

[0025] Figure 3 This is a cross-sectional structural schematic diagram of an electrically adjustable multi-stage assist support device according to some embodiments of this application.

[0026] Figure 4 yes Figure 3 Enlarged schematic diagram of part A in the diagram.

[0027] Figure 5 yes Figure 3 Enlarged schematic diagram of part B in the diagram.

[0028] Figure 6This is a schematic diagram of the structure of an electrically adjustable multi-stage assisted support device according to some embodiments of this application, in which the jacking part is raised to the first position.

[0029] Figure 7 This is a cross-sectional structural schematic diagram of the jacking part of an electrically adjustable multi-stage assist support device according to some embodiments of this application, raised to a first position.

[0030] Figure 8 This is a schematic diagram of the structure of the electric adjustable multi-stage assist support device according to some embodiments of this application, where the jacking part is raised to the highest position.

[0031] Figure 9 This is a cross-sectional structural schematic diagram of the jacking section of an electrically adjustable multi-stage assist support device according to some embodiments of this application, raised to its highest position.

[0032] Figure 10 This is a schematic diagram of the electric drive mechanism of an electrically adjustable multi-stage assist support device according to some embodiments of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Support frame; 100. Top plate; 101. Branch pipe; 102. Receiving cavity; 103. Limiting plate; 2. Base frame; 200. Slide groove; 201. Rotating connection point; 3. Support assembly; 300. First support arm; 301. Second support arm; 302. Third support arm; 303. Roller; 304. Clearance hole; 305. Limiting post; 306. Roller; 4. Fixing frame; 400. Slide hole; 5. Guide block; 500. Guide surface; 6. Electric drive mechanism; 600. Drive motor; 601. Transmission nut; 602. Lead screw. Detailed Implementation

[0035] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0036] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0037] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0039] See Figures 1-5 As shown in the figure; this application discloses an electrically adjustable multi-stage power assist support device for use in bed or seating furniture, such as a bed frame placed under a soft mattress, or the bottom of a soft sofa cushion; its structure includes a base frame 2, a support frame 1, and an electric drive mechanism 6. The base frame 2 is horizontally arranged and has a sliding groove 200 extending along its length. The first end of the base frame 2 is provided with a rotating connection point 201, and the second end of the base frame 2 is connected to the electric drive mechanism 6. The support frame 1 is arranged above the base frame 2, and the first end of the support frame 1 is set as a connecting end. This connecting end is rotatably connected to the rotating connection point 201, so that the support frame 1 can rotate around the rotating connection point 201 to adjust the angle of the support frame 1 relative to the base frame 2. In this embodiment, the rotating connection point 201 can be a pivot, hinge pin, rotating joint, etc., used to connect the support frame 1 and the base frame 2, and to allow the angle of the support frame 1 relative to the base frame 2 to be rotatably adjusted. The support frame 1 is in direct contact with the bottom of the mattress or cushion, and when the support frame 1 rotates relative to the base frame 2, it can drive the mattress or cushion to rotate synchronously.

[0040] like Figure 3 and Figure 5 As shown, a fixed frame 4 is connected to the bottom of the support frame 1 near its connecting end. The fixed frame 4 has an elongated sliding hole 400 extending along the length of the support frame 1. The fixed frame 4 can rotate synchronously with the support frame 1.

[0041] In this embodiment, as Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a support assembly 3 is fitted within the slide groove 200 with a clearance fit. This support assembly 3 includes a first support arm 300, a second support arm 301, and a third support arm 302, which are rotatably connected in sequence. These three support arms are arranged sequentially along the length of the slide groove 200, with the third support arm 302 located on the side of the slide groove 200 closest to the rotation connection point 201. One end of the first support arm 300 is rotatably connected to the first end of the second support arm 301, and the second end of the second support arm 301 is rotatably connected to the first end of the third support arm 302. Arm 300, second support arm 301 and third support arm 302 form a rotation chain; first support arm 300 is connected to electric drive mechanism 6 for transmission, and the rotational connection between first support arm 300 and second support arm 301 forms a pushing part that contacts the back of support frame 1; a limiting post 305 with clearance fit in sliding hole 400 is connected to the second end of third support arm 302. When electric drive mechanism 6 drives first support arm 300 to move towards rotational connection point 201 near base frame 2, second support arm 301 and third support arm 302 move synchronously towards rotational connection point 201 near base frame 2.

[0042] Furthermore, in this embodiment, a guide block 5 is connected to the base frame 2. The guide block 5 has a guide surface 500, which is configured to guide the first support arm 300 to rise upward and cause the pusher to drive the support frame 1 to rotate upward when the first support arm 300 moves towards the rotation connection point 201 near the base frame 2. When the pusher rises upward with the first support arm 300 to the first position, the limiting post 305 on the third support arm 302 slides to abut against the inner end of the sliding hole 400. When the pusher continues to rise upward from the first position, it links the third support arm 302 to rotate and provides auxiliary support to the support frame 1. In this embodiment, the first position is the position where the first support arm 300 is supported at the highest point of the guide block 5 and is about to detach from the guide block 5. When the pushing part continues to rise from the first position, due to the abutment and limitation between the limiting post 305 of the third support arm 302 and the inner end of the sliding hole 400, the first support arm 300 is raised and detached from the guide block 5 under the support of the second support arm 301. During this process, the raised support frame 1 drives the second end of the third support arm 302 to rotate upward or tilt upward, and the second support arm 301 moves towards the third support arm 302 and supports the first end of the third support arm 302 while the second end of the third support arm 302 rotates upward and lifts. Thus, the third support arm 302 provides assistance to support the load of the support frame 1.

[0043] In this embodiment, when the electric drive mechanism 6 of the electrically adjustable multi-stage assist support device drives the first support arm 300 to move along the length direction of the slide groove 200 towards the rotation connection point 201 near the base frame 2, the first support arm 300 moves synchronously through the second support arm 301 and the third support arm 302. Under the guidance of the guide surface 500 of the guide block 5, the end of the first support arm 300 located at the push part is lifted upward, and the push part pushes the support frame 1 to rotate upward. At this time, the guide surface 500 of the guide block 5 provides assistance for the lifting of the first support arm 300 and the push part and provides support force for the rotation of the support frame 1. When the push part is lifted upward to the first position along with the first support arm 300, the limiting post 305 on the third support arm 302 slides to abut against and limit the inner end of the slide hole 400. Specifically, the slide hole 400 is elongated, and its inner end is the end of the slide hole 400 near the rotation connection point 201. In this state, the outer end of the third support arm 302 tilts upward but does not provide support for the support frame 1; and when the pushing part continues to rise from the first position, the first support arm 300 disengages from the guide block 5. At this time, the first support arm 300 is supported by the second support arm 301 to rotate and lift upward; the second support arm 301, in conjunction with the outer end of the third support arm 302, rotates upward, and under the action of the second support arm 301, the third support arm 302 provides auxiliary support to the support frame 1. Therefore, this electrically adjustable multi-stage auxiliary support device can provide multi-stage auxiliary support for the support frame 1, increasing the load of the support device. That is, when the support frame 1 is in the unfolded state, in addition to the support force of the first support arm 300 on the support frame 1, the third support arm 302 also provides support force for the support frame 1 at the same time. Therefore, this electrically adjustable multi-stage auxiliary support device has a large load and good support stability; in addition, the support frame 1 of this electrically adjustable multi-stage auxiliary support device can be relatively folded under the action of the electric drive mechanism 6, so that the electrically adjustable multi-stage auxiliary support device is thin, small in size, and compact in structure in the initial folded state.

[0044] In some embodiments, a roller 303 is connected to the rotatable connection between the first support arm 300 and the second support arm 301. The outer edge of the roller 303 is higher than the top plane of the first support arm 300 or the second support arm 301, and the roller 303 forms the pushing part.

[0045] In other embodiments, the pushing part may also be the end of the first support arm 300 near the second support arm 301, or a top block, pulley, etc. may be installed on the end of the first support arm 300 near the second support arm 301.

[0046] In some embodiments, such as Figure 2As shown, the lengths of the first support arm 300, the second support arm 301, and the third support arm 302 are successively shortened, that is, the length of the second support arm 301 is less than the length of the first support arm 300, and the length of the third support arm 302 is less than the length of the second support arm 301; and when the support frame 1 rotates to the maximum angle, the first support arm 300 is parallel to the third support arm 302, and the included angle between the second support arm 301 and the base frame 2 is less than 90 degrees. When the support frame 1 rotates to its maximum angle, it is in a state of maximum suspension. At this time, the first support arm 300 and the third support arm 302 form a parallel structure, jointly supporting the load of the support frame 1. The supporting forces provided by the two do not interfere with each other or cancel each other out, thus improving the load-bearing capacity of the support frame 1. When the support frame 1 rotates to its maximum angle, the angle between the second support arm 301 and the base frame 2 is less than 90 degrees. That is, the second support arm 301 not only provides support force in the height direction of the first support arm 300, but also provides support force to restrict the backward movement of the third support arm 302, making the support structure composed of the first support arm 300, the second support arm 301 and the third support arm 302 more stable.

[0047] It is easy to understand that in this embodiment, when the support frame 1 rotates to the maximum angle, that is, when the first support arm 300 is raised to the second position, during the process of the first support arm 300 being raised from the first position to the second position, the first support arm 300, the second support arm 301 and the third support arm 302 together constitute a support structure for the support frame 1, which has strong support stability.

[0048] Furthermore, in this embodiment, to prevent the support frame 1 from overturning and detaching due to a control failure of the electric drive mechanism 6 causing the support frame 1 to continue rotating after reaching its maximum angle, the connecting end of the support frame 1 is provided with a limiting plate 103 that bends towards the base frame 2. Figure 5 As shown, when the support frame 1 rotates to its maximum angle, the limiting plate 103 abuts against the base frame 2 to restrict the rotation of the support frame 1.

[0049] In this embodiment, as Figure 10As shown, the electric drive mechanism 6 includes a drive motor 600 and a lead screw 602 that is rotatable and arranged along the length of the base frame 2. A transmission nut 601 is threaded onto the lead screw 602, and the transmission nut 601 is rotatably connected to the first support arm 300. The drive motor 600 is drively connected to the lead screw 602. The drive motor 600 drives the lead screw 602 to rotate, thereby causing the transmission nut 601 to drive the first support arm 300 to move axially along the lead screw 602. At the same time, due to the rotation and lifting of the first support arm 300, the first support arm 300 can rotate relative to the transmission nut 601. Of course, in other embodiments, the electric drive mechanism 6 can also be an electric push rod, the free end of which is rotatably connected to the outer end of the first support arm 300, and the axis of the electric push rod is parallel to the length direction of the slide groove 200.

[0050] See you again Figure 3 and Figure 4 As shown, the guide block 5 is installed on the inner bottom wall of the slide groove 200. The guide block 5 has an inclined surface that rises from low to high along a first direction of the slide groove 200, forming the guide surface 500. The first direction is the direction in which the first support arm 300 slides towards the rotation connection point 201 of the base frame 2; conversely, the second direction is the direction in which the first support arm 300 slides away from the rotation connection point 201 of the base frame 2. During the process of the electric drive mechanism 6 driving the first support arm 300 to move along the second direction until the support frame 1 and the base frame 2 are in a folded state, the guide block 5 will not interfere with or obstruct the movement of the first support arm 300, and the folding operation is very smooth.

[0051] In some embodiments, a roller 306 is connected to the bottom of the first support arm 300, such as... Figure 4 As shown, the roller 306 is located on the side of the first support arm 300 near the pushing part; when the support frame 1 is in the lowest position, the roller 306 is located at the lowest position of the guide surface 500. Therefore, when the electric drive mechanism 6 drives the first support arm 300 to move towards the rotation connection point 201, the support frame 1 can be quickly rotated upward and unfolded, increasing the unfolding speed of the support frame 1.

[0052] In some embodiments, such as Figure 2 and Figure 3 As shown, the first support arm 300 between the roller 306 and the pushing part is provided with a clearance hole 304 for the top of the guide block 5 to extend into when the support frame 1 is in its lowest position. In order to reduce the thickness of the support frame 1 and the base frame 2 after folding, and to ensure the guiding height of the guide block 5 on the first support arm 300, the clearance hole 304 is provided on the first support arm 300. The clearance hole 304 not only ensures the guiding height requirement of the first support arm 300, but also avoids interference with the support frame 1 when it is in the obstructed state.

[0053] In this embodiment, to further reduce the thickness of the folded support frame 1 and base frame 2 and save packaging volume, the support frame 1 includes a top plate 100 and two parallel branch pipes 101 connected to the bottom of the top plate 100. A receiving cavity 102 is formed between the top plate 100 and the two branch pipes 101. When the support frame 1 is rotated to be parallel to the base frame 2, at least a portion of the base frame 2 is located within the receiving cavity 102. This arrangement makes the thickness between the folded support frame 1 and base frame 2 even smaller.

[0054] See Figure 6 and Figure 7 The diagram shows the electric drive mechanism 6 driving the first support arm 300 to move towards the rotation connection point 201 near the base frame 2 until the bottom of the roller 306 contacts the highest point of the guide surface 500. At this time, the limiting post 305 on the third support arm 302 slides to abut against the inner end of the sliding hole 400 and is limited; for example... Figure 8 and Figure 9 As shown, the electric drive mechanism 6 drives the first support arm 300 to the highest point. At this time, the limiting plate 103 abuts against the base frame 2 to restrict the rotation of the support frame 1.

[0055] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0056] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A motorized adjustable multi-stage assist support device, characterized by: It includes The base frame has a sliding groove extending along its length, and the base frame is provided with a rotating connection point; A support frame has a connecting end, which is rotatably connected to the rotating connection point; an elongated sliding hole extending along the length of the support frame is provided on the support frame near the connecting end. An electric drive mechanism is connected to the base frame; A support assembly, with clearance fitting within the slide groove, comprises a first support arm, a second support arm, and a third support arm rotatably connected sequentially along the length of the slide groove. The first support arm is drive-connected to the electric drive mechanism, and the rotatable connection between the first and second support arms forms a pushing portion that contacts the back of the support frame. A limiting post with clearance fitting within the slide hole is connected to the third support arm, and when the electric drive mechanism drives the first support arm to move towards the rotatable connection point closer to the base frame, the third support arm moves synchronously in conjunction with it. A guide block, connected to the base frame, has a guide surface configured to guide the first support arm to lift upward and cause the pusher to drive the support frame to rotate upward when the first support arm moves toward the rotation connection point of the base frame. When the pusher is raised to the first position along with the first support arm, the limiting post on the third support arm slides to abut against the inner end of the sliding hole. As the pusher continues to rise from the first position, it rotates in conjunction with the third support arm and provides auxiliary support to the support frame.

2. The electrically adjustable multi-stage assisted support device of claim 1, wherein: The lengths of the first support arm, the second support arm, and the third support arm are successively shortened, and when the support frame rotates to its maximum angle, the first support arm is parallel to the third support arm, and the angle between the second support arm and the base frame is less than 90 degrees.

3. The electrically adjustable multi-stage assisted support device of claim 1, wherein: A roller is connected at the rotatable connection between the first support arm and the second support arm. The outer edge of the roller is higher than the top plane of the first support arm or the second support arm, and the roller forms the pushing part.

4. The electrically adjustable multi-stage assisted support device of claim 3, wherein: The guide block has an inclined surface that rises from low to high along a first direction of the slide groove, and the inclined surface forms the guide surface; wherein, the first direction is the direction in which the first support arm slides toward the base frame rotation connection point.

5. The electrically adjustable multi-stage assisted support device of claim 1 or 4, wherein: A roller is connected to the bottom of the first support arm, and the roller is located on the side of the first support arm near the pushing part; when the support frame is in the lowest position, the roller is located at the lowest position of the guide surface.

6. The electrically adjustable multi-stage power assist support device according to claim 5, characterized in that: The first support arm between the roller and the pusher is provided with a clearance hole for the top of the guide block to extend into when the support frame is in its lowest position.

7. The electrically adjustable multi-stage power assist support device according to claim 1, characterized in that: The support frame is connected to a fixed frame near its connecting end at the bottom, and the fixed frame is provided with the elongated sliding hole extending along the length direction of the support frame.

8. The electrically adjustable multi-stage power assist support device according to claim 1, characterized in that: The connecting end of the support frame is provided with a limiting plate that bends toward the base frame. When the support frame rotates to its maximum angle, the limiting plate abuts against the base frame.

9. The electrically adjustable multi-stage power assist support device according to claim 1, characterized in that: The support frame includes a top plate and two parallel branch pipes connected to the bottom of the top plate. A receiving cavity is formed between the top plate and the two branch pipes. When the support frame is rotated to be parallel to the base frame, at least a portion of the base frame is located in the receiving cavity.

10. The electrically adjustable multi-stage power assist support device according to claim 1, characterized in that: The electric drive mechanism includes a drive motor and a lead screw that is rotatable along the length of the base frame. A transmission nut is threaded onto the lead screw, and the transmission nut is rotatably connected to the first support arm. The drive motor is driven by the lead screw.

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