Lifting chair

Abstract

The utility model provides a lifting chair which comprises a supporting mechanism, a backrest mechanism, a stool mechanism and a lifting mechanism, and the supporting mechanism comprises a base assembly and a supporting assembly; the backrest mechanism is slidably connected with the supporting assembly, and the stool mechanism is rotatably connected with the bottom of the backrest mechanism; the lifting mechanism comprises a power assembly and two transmission assemblies embedded in the backrest mechanism, the two transmission assemblies are arranged on the two sides of the power assembly respectively and matched with the supporting assembly, and the power assembly is used for driving the two transmission assemblies to synchronously drive the backrest mechanism to slide in the length direction of the supporting assembly. The lifting mechanism of the lifting chair is embedded in the backrest mechanism, the power assembly and the transmission assemblies are hidden, direct contact between a user and the power assembly and the transmission assemblies is avoided, the probability of occurrence of safety accidents such as clamping injury is greatly reduced, more balanced power output can be provided through the design of the double transmission assemblies, and the safety of the user is improved. And the backrest mechanism is kept stable in the lifting process.

Description

Technical Field

[0001] This disclosure relates to the field of elderly care machinery technology, and in particular to a height-adjustable chair. Background Technology

[0002] Existing electric height-adjustable chairs typically use a vertically positioned electric push rod in the center. This design often leads to asynchronous left and right height adjustments due to assembly errors during manufacturing, resulting in swaying and affecting user experience and safety. In terms of safety, the exposed transmission mechanism not only poses a risk of hand pinching but also makes the chair susceptible to damage during transportation, reducing its lifespan. Utility Model Content

[0003] This disclosure provides a height-adjustable chair to at least solve the above-mentioned technical problems existing in the prior art.

[0004] The adjustable chair according to this disclosure includes a support mechanism, a backrest mechanism, a seat mechanism, and a lifting mechanism; wherein,

[0005] The support mechanism includes a base assembly and a support assembly connected to the base assembly;

[0006] The backrest mechanism is slidably connected to the support assembly, and the seat mechanism is rotatably connected to the bottom of the backrest mechanism.

[0007] The lifting mechanism includes a power component and two sets of transmission components embedded in the backrest mechanism. The two sets of transmission components are respectively located on both sides of the power component and cooperate with the support component. The power component is used to drive the two sets of transmission components to synchronously drive the backrest mechanism to slide along the length direction of the support component.

[0008] In one possible implementation, the power assembly includes:

[0009] The driving component is fixed to the backrest mechanism; and

[0010] An output shaft is provided along the width direction of the backrest mechanism. One end of the output shaft is fixedly connected to the drive component, and the other end is engaged with the transmission assembly.

[0011] The driving component is used to drive the output shaft to rotate about the axial direction of the output shaft.

[0012] In one possible implementation, the transmission assembly includes:

[0013] Nuts are used to secure the support assembly.

[0014] A lead screw is provided along the length of the backrest mechanism and engages with the nut;

[0015] A first bevel gear is disposed on the output shaft at one end away from the driving member; and

[0016] The second bevel gear is disposed on one end of the lead screw near the output shaft and meshes with the first bevel gear. The second bevel gear drives the lead screw to rotate, so that the lead screw moves axially relative to the nut.

[0017] In one embodiment, the backrest mechanism is provided with a first limit switch and a second limit switch, the first limit switch and the second limit switch being spaced apart along the length direction of the backrest mechanism;

[0018] The support assembly is provided with a slider, which is configured to trigger the first limit switch and the second limit switch;

[0019] The first limit switch is used to limit the backrest mechanism to a first position, and the second limit switch is used to limit the backrest mechanism to a second position.

[0020] In one embodiment, a buffer portion is provided at the end of the transmission assembly away from the power assembly.

[0021] In one possible implementation, the support assembly includes two hollow support rods disposed opposite each other;

[0022] The backrest mechanism is provided with sleeves on both sides, and the two sleeves are fitted onto the two hollow support rods in a one-to-one correspondence and form a sliding fit with the hollow support rods;

[0023] The transmission component is disposed inside the sleeve and extends into the hollow support rod to cooperate with the hollow support rod.

[0024] In one embodiment, the backrest mechanism is further provided with a handle assembly, and the sleeve extends into the handle assembly and communicates with the handle assembly;

[0025] The handle assembly includes a first housing and a second housing that interlock, with a receiving cavity formed between the first housing and the second housing for accommodating the power assembly.

[0026] In one embodiment, the power assembly further includes a power connector for connecting the controller.

[0027] In one embodiment, the buffer portion includes a positioning element and a buffer ring, the positioning element being fixedly connected to the transmission assembly, and the buffer ring being sleeved on the positioning element.

[0028] In one embodiment, connecting shafts are provided on both sides of the backrest mechanism, and armrests are rotatably connected to the connecting shafts.

[0029] In this disclosure, the adjustable chair utilizes a well-designed support mechanism, particularly the synergistic effect of the base and support components, to provide a stable foundation. The sliding connection between the backrest mechanism and the support components, along with the transmission design of the lifting mechanism, ensures the stability of the backrest during lifting, effectively reducing swaying and tilting, and enhancing user safety. The lifting mechanism is embedded within the backrest mechanism, concealing the power and transmission components, avoiding direct contact between the user and these components, significantly reducing the probability of accidents such as pinching injuries. The dual transmission component design provides more balanced power output, ensuring the backrest mechanism remains stable during lifting. This design also reduces the possibility of external impacts and scratches to the transmission components, extending the chair's lifespan. Furthermore, the rotating connection design at the bottom of the seat and backrest mechanisms increases the chair's versatility, allowing it to be folded away after use, greatly improving space utilization.

[0030] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0031] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0032] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0033] Figure 1 A schematic diagram of the overall structure of an exemplary embodiment of the present disclosure of a height-adjustable chair is shown (with the backrest mechanism in the first position);

[0034] Figure 2 A schematic diagram of the overall structure of an exemplary embodiment of the present disclosure of a height-adjustable chair is shown (the backrest mechanism is located in the second position);

[0035] Figure 3 A partial cross-sectional view of the backrest mechanism of an exemplary embodiment of the present disclosure is shown;

[0036] Figure 4 A cross-sectional view of an exemplary embodiment of the present disclosure, a height-adjustable chair, is shown;

[0037] Figure 5 It shows Figure 4 A magnified view of a section at point A in the middle;

[0038] Figure 6 It shows Figure 4 A magnified view of a section at point B in the middle;

[0039] Figure 7 It shows Figure 4 A magnified view of a section at point C;

[0040] Figure 8 A schematic diagram of the structure of a first limit switch for a height-adjustable chair, an exemplary embodiment of the present disclosure, is shown.

[0041] The following are the labeling instructions in the diagram: 1. Support mechanism; 2. Backrest mechanism; 3. Seat mechanism; 4. Lifting mechanism; 5. Buffer; 11. Base assembly; 12. Support assembly; 21. First limit switch; 22. Second limit switch; 23. Sleeve; 24. Handle assembly; 25. Connecting shaft; 26. Armrest; 41. Power assembly; 42. Transmission assembly; 51. Positioning component; 52. Buffer ring; 53. Locking component; 54. Washer; 111. Roller; 121. Hollow support rod; 211. Trigger lever; 212. Diode; 411. Drive component; 412. Output shaft; 413. Power connector; 421. Nut; 422. Lead screw; 423. First bevel gear; 424. Second bevel gear. Detailed Implementation

[0042] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0043] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0044] Reference Figures 1-3 As shown, an exemplary embodiment of the present disclosure discloses a height-adjustable chair, including a support mechanism 1, a backrest mechanism 2, a seat mechanism 3, and a height-adjusting mechanism 4. The support mechanism 1 includes a base assembly 11 and a support assembly 12 connected to the base assembly 11. The backrest mechanism 2 is slidably connected to the support assembly 12, and the seat mechanism 3 is rotatably connected to the bottom of the backrest mechanism 2. The height-adjusting mechanism 4 includes a power assembly 41 and two sets of transmission assemblies 42 embedded in the backrest mechanism 2. The two sets of transmission assemblies 42 are respectively disposed on both sides of the power assembly 41 and cooperate with the support assembly 12. The power assembly 41 is used to drive the two sets of transmission assemblies 42 to convert rotational motion into linear motion, and the two sets of transmission assemblies 42 synchronously drive the backrest mechanism 2 to slide along the length direction of the support assembly 12.

[0045] It should be noted that the directions of front, back, left, right, up, and down in this disclosure are based on the direction when the chair is in normal use. For example, the seat mechanism 3 is located in front of the backrest mechanism 2 to provide a seat for the user; the support component 12 is arranged in the vertical direction, and the backrest mechanism 2 moves up and down along the length of the support component 12, that is, it drives the seat mechanism 3 to slide in the vertical direction to change its height relative to the ground; the base component 11 extends along the front and back direction of the chair.

[0046] In this embodiment, the base assembly 11 serves to stably support the entire adjustable chair. Its design fully considers the stability of contact with the ground and friction factors, ensuring that the adjustable chair can stand stably when placed on different ground materials. A roller 111 is installed at one end of the base assembly 11 for transport and dragging. The support assembly 12 is made of rigid material, rated to withstand applied forces without bending or other damage, providing a track and support for the sliding of the backrest mechanism 2, ensuring the linear movement trajectory of the backrest mechanism 2 during lifting. Specifically, when the user sits on the seat mechanism 3, the seat mechanism 3 and the support assembly 12 bear significant forces. For the user's comfort and safety, the support assembly 12 can be a sufficiently robust steel pipe, minimizing or eliminating its deformation. The backrest mechanism 2 is slidably connected to the support assembly 12, allowing the backrest mechanism 2 to slide smoothly up and down along the length of the support assembly 12. The seat mechanism 3 can descend to the ground vertically along with the backrest mechanism 2 to provide greater convenience for users with mobility impairments. Simultaneously, to allow for greater user autonomy, the seat mechanism 3 needs to be able to rise to a maximum height to expand its application range. The seat mechanism 3 is rotatably connected to the bottom of the backrest mechanism 2, allowing the seat mechanism 3 to be folded up and used for seating. The lifting mechanism 4 can be wholly or partially embedded in the backrest mechanism 2, effectively avoiding safety hazards caused by exposed transmission components. For example, the lifting mechanism 4 includes a power component 41 and two sets of transmission components 42 embedded in the backrest mechanism 2. The power component 41 serves as the power source for the entire lifting system, providing driving energy. The transmission components 42 cooperate with the support component 12, converting the rotational motion generated by the power component 41 into linear motion under the drive of the power component 41. The power component 41 is fixedly connected to the backrest mechanism 2 and can move up and down with the backrest mechanism 2. Understandably, the power component 41 can be embedded within the backrest mechanism 2 or locked to the surface of the backrest mechanism 2, ensuring it can drive the transmission component 42. Specifically, when the power component 41 operates, it drives the transmission components in the transmission component 42, such as lead screws, chains, and racks. These transmission components interact with the support component 12, enabling the backrest mechanism 2 to smoothly rise or fall along the support component 12. During this lifting and lowering process, it can assist the user in changing from a reclining posture to a sitting or standing posture. Understandably, both sets of transmission components 42 are simultaneously driven by the power component 41, synchronously driving the backrest mechanism 2 to slide. This dual-transmission component 42 design provides a more balanced power output, ensuring the backrest mechanism 2 remains stable during lifting and lowering.

[0047] In summary, the disclosed height-adjustable chair, through the rational design of the support mechanism 1, especially the synergistic effect of the base component 11 and the support component 12, provides a stable support foundation for the chair. The sliding connection between the backrest mechanism 2 and the support component 12, as well as the transmission design of the lifting mechanism 4, ensures the stability of the backrest mechanism 2 during the lifting process, effectively reducing swaying and tilting, and enhancing user safety. The lifting mechanism 4 is embedded in the backrest mechanism 2, concealing the power component 41 and the transmission component 42, avoiding direct contact between the user and the power component 41 and the transmission component 42, greatly reducing the probability of accidents such as pinching injuries. The design of the dual transmission components 42 provides a more balanced power output, ensuring that the backrest mechanism 2 remains stable during the lifting process. At the same time, this design also reduces the possibility of the transmission components being subjected to external collisions and scratches, extending the service life of the chair. In addition, the rotating connection design between the seat mechanism 3 and the bottom of the backrest mechanism 2 increases the functionality of the chair, allowing it to be folded inward after use, greatly improving space utilization.

[0048] Reference Figure 3 As shown, in one embodiment, the power assembly 41 includes a drive member 411 and an output shaft 412. The drive member 411 is fixed to the backrest mechanism 2, and the output shaft 412 is arranged along the width direction of the backrest mechanism 2. One end of the output shaft 412 is fixedly connected to the drive member 411, and the other end cooperates with the transmission assembly 42. The drive member 411 is used to drive the output shaft 412 to rotate about its axial direction.

[0049] In this embodiment, the output shaft 412 is arranged along the width direction of the backrest mechanism 2. This arrangement fully considers the internal space layout of the chair. Positioning the output shaft 412 along the width direction of the backrest mechanism 2 allows for better utilization of the internal space, making the layout of the entire power assembly 41 and other components more compact and rational. One end of the output shaft 412 is fixedly connected to the drive member 411. This fixed connection ensures that the power generated by the drive member 411 can be stably and efficiently transmitted to the output shaft 412. In actual manufacturing, key connections, interference fits, or other methods are typically used to ensure a tight connection between the two, preventing loosening during high-speed rotation. The other end of the output shaft 412 is connected to the transmission assembly 42. When the drive member 411 drives the output shaft 412 to rotate around its axial direction, the output shaft 412 transmits the rotation to the transmission assembly 42. The transmission assembly 42 then converts the rotational motion into linear motion, thereby causing the backrest mechanism 2 to slide along the length direction of the support assembly 12, thus realizing the lifting function of the chair. When the user activates the lifting function of the chair, the drive unit 411 begins to work. Taking a motor as an example, after the drive unit 411 is energized, it drives the output end to rotate, which in turn drives the output shaft 412, which is fixedly connected to the drive unit 411, to rotate around the axial direction of the output shaft 412. The rotation speed and direction of the output shaft 412 are determined by the control method of the drive unit 411. For example, by changing the direction of the motor current, the output shaft 412 can be reversed, thereby controlling the rise and fall of the backrest mechanism 2; by adjusting the voltage or frequency of the motor, the rotational speed of the output shaft 412 can be adjusted, thereby controlling the lifting speed of the backrest mechanism 2. When the output shaft 412 rotates, the transmission component 42 at its other end begins to work under the drive of the output shaft 412. The transmission component 42 usually adopts a lead screw and nut mechanism, chain drive mechanism, etc., to convert the rotational motion of the output shaft 412 into linear motion, pushing the backrest mechanism 2 to rise or fall along the length of the support component 12, thus completing the lifting operation of the chair.

[0050] Preferably, the drive component 411 of this disclosure adopts a worm gear reducer. The number of output shafts 412 can be a single output shaft 412 or a double output shaft 412, which can be adaptively selected and designed according to the number and position of the transmission components 42. For example, if there is only one set of transmission components 42, the single output shaft 412 can cooperate with the transmission component 42 to realize the lifting and lowering movement of the backrest mechanism 2; if there are two sets of transmission components 42, the two output shafts 412 are respectively arranged at the two output ends of the worm gear reducer, and the two output shafts 412 are located on the same straight line and are driven by the worm gear reducer together.

[0051] Reference Figures 4-6As shown, in one embodiment, the transmission assembly 42 includes a nut 421, a lead screw 422, a first bevel gear 423, and a second bevel gear 424. The nut 421 is fixed to the support assembly 12, and the lead screw 422 is arranged along the length direction of the backrest mechanism 2 and engages with the nut 421. The first bevel gear 423 is disposed on the output shaft 412 at the end away from the drive member 411, and the second bevel gear 424 is disposed on the lead screw 422 at the end near the output shaft 412 and meshes with the first bevel gear 423. The second bevel gear 424 drives the lead screw 422 to rotate, so that the lead screw 422 moves axially relative to the nut 421.

[0052] In this embodiment, the nut 421 is fixed to the support assembly 12. It serves as a support and guide for the movement of the lead screw 422. The nut 421 is typically tightly connected to the support assembly 12 using methods such as welding or bolting to prevent loosening during the movement of the lead screw 422. The nut 421 is designed with high-precision internal threads, which reduces friction and clearance between the lead screw 422 and the nut 421, ensuring the smoothness of the lead screw 422 during axial movement. The lead screw 422 is positioned along the length of the backrest mechanism 2 and works in conjunction with the nut 421. The length and diameter of the lead screw 422 are rationally selected based on the design lifting height and load-bearing capacity of the adjustable chair. The thread machining accuracy of the lead screw 422 directly affects the transmission efficiency and service life. High-precision thread machining improves the fit accuracy between the lead screw 422 and the nut 421, reduces the coefficient of friction, and minimizes wear. When the lead screw 422 rotates within the nut 421, since the nut 421 remains stationary, the lead screw 422 will move axially relative to the nut 421, thereby driving the backrest mechanism 2 to achieve lifting and lowering motion. The first bevel gear 423 is located on the output shaft 412 at the end away from the drive member 411, and the second bevel gear 424 is located on the lead screw 422 at the end close to the output shaft 412, and the two mesh with each other. This arrangement of bevel gears enables the steering transmission of power; that is, the first bevel gear 423 on the horizontal output shaft 412 drives the second bevel gear 424 on the vertical lead screw 422, converting horizontal rotation into vertical rotation. Specifically, when the drive component 411 drives the output shaft 412 to rotate, the first bevel gear 423 on the output shaft 412 rotates accordingly. The first bevel gear 423 then drives the second bevel gear 424, which meshes with it, to rotate. Since the second bevel gear 424 is fixed on the lead screw 422, the rotation of the second bevel gear 424 will drive the lead screw 422 to rotate, thereby causing the lead screw 422 to move axially relative to the nut 421, ultimately realizing the lifting and lowering of the backrest mechanism 2 along the length of the support assembly 12. It can be understood that, in order to ensure the stability of the transmission process, the meshing structure of the first bevel gear 423 and the second bevel gear 424 is also connected by a housing to form a transmission assembly to ensure that their relative positions do not change. Thus, by using the cooperation of the lead screw 422 and the nut 421, and the bevel gear transmission method, compared with the traditional complex transmission structure, the energy loss in the power transmission process is reduced. In addition, the fixed connection between the nut 421 and the support assembly 12 and the precise cooperation between the lead screw 422 and the nut 421 provide stable support and guidance for the lifting and lowering of the backrest mechanism 2. During the lifting and lowering process, the backrest mechanism 2 can rise and fall smoothly along the support component 12, effectively reducing swaying and deviation.

[0053] In one embodiment, the backrest mechanism is provided with a limiting component, which is used to cooperate with the support component to limit the backrest mechanism to a first position or a second position.

[0054] Specifically, refer to Figure 4 and Figure 8 As shown, in one embodiment, the limiting component includes a first limiting switch 21 and a second limiting switch 22 disposed on the backrest mechanism 2, with the first limiting switch 21 and the second limiting switch 22 spaced apart along the length direction of the backrest mechanism 2. A slider is disposed on the support component 12, configured to trigger the first limiting switch 21 and the second limiting switch 22. The first limiting switch 21 is used to limit the backrest mechanism 2 to a first position, and the second limiting switch 22 is used to limit the backrest mechanism 2 to a second position.

[0055] In this embodiment, the positions of the first limit switch 21 and the second limit switch 22 are designed to correspond to the two extreme positions of the backrest mechanism 2 during the lifting and lowering process. A slider (not shown in the figure) is provided on the support assembly 12. The position of the slider on the support assembly 12 is relatively fixed, and its function is to cooperate with the first limit switch 21 or the second limit switch 22. When the backrest mechanism 2 moves up and down, the first limit switch 21 and the second limit switch 22 will move accordingly. During the rising or falling process of the backrest mechanism 2, the first limit switch 21 or the second limit switch 22 will be contacted and triggered by the slider when the backrest mechanism 2 moves to a specific position. Specifically, the second limit switch 22 is located above the first limit switch 21. The first position corresponds to the highest point of the backrest mechanism 2, and the second position corresponds to the lowest point of the backrest mechanism 2. The highest point and the lowest point are the two extreme positions. When the backrest mechanism 2 rises to its highest point, the first limit switch 21 moves to the position of the slider, and the trigger lever 211 on the first limit switch 21 is pressed down by the slider; when the backrest mechanism 2 descends to its lowest point, the second limit switch 22 moves to the position of the slider, and the trigger lever 211 on the second limit switch 22 is pressed down by the slider. The limiting principles of the first limit switch 21 and the second limit switch 22 are the same. Taking the first limit switch 21 as an example, in the normally open state, the internal circuit of the first limit switch 21 is in a conductive state. When the backrest mechanism 2 rises to near its highest point, due to the relative sliding between the backrest mechanism 2 and the support assembly 12, the trigger lever 211 on the first limit switch 21 gradually approaches and is pressed by the slider. After the trigger lever 211 is pressed, the internal circuit of the first limit switch 21 is disconnected. At this time, current cannot pass through the inside of the switch and can only pass through the diode 212 soldered to the outside. Since the diode 212 has the characteristic of allowing only unidirectional current to pass through, the direction of current in the circuit is limited, causing the driving component 411 that drives the backrest mechanism 2 to rise to stop working, thereby limiting the backrest mechanism 2 to the first position, that is, the highest point in the lifting direction, realizing the function that the highest point can only descend. The second limit switch 22 differs from the first limit switch 21 only in that the diode 212 outside the second limit switch 22 is soldered in the opposite direction to the diode 212 outside the first limit switch 21, thereby allowing the backrest mechanism 2 to be limited to the second position, that is, the lowest point in the lifting direction, realizing the function that the lowest point can only rise. By cooperating with the first limit switch 21, the second limit switch 22, and the sliding plate, excessive lifting and lowering of the backrest mechanism 2 is effectively prevented, reducing the risk of user injury due to loss of control of the chair and greatly improving the safety of the adjustable chair. In addition, the limit function can prevent damage to the lifting mechanism 4, support components 12, and other parts of the adjustable chair due to excessive lifting and lowering, extending the overall service life of the adjustable chair and reducing maintenance costs.

[0056] Reference Figure 7As shown, in one embodiment, a buffer portion 5 is provided at the end of the transmission assembly 42 away from the power assembly 41.

[0057] Specifically, in one embodiment, the buffer part 5 includes a positioning member 51 and a buffer ring 52. The positioning member 51 is fixedly connected to the transmission assembly 42, and the buffer ring 52 is sleeved on the positioning member 51.

[0058] In this embodiment, the buffer part 5 can be implemented using various materials and structures. For example, the buffer part 5 can be made of elastic materials such as rubber and silicone. These elastic materials have good elastic deformation capabilities and can undergo elastic deformation when subjected to impact force, absorbing impact energy. This reduces damage to the transmission component 42 and other components when the transmission component 42 swings and collides with the inner wall of the support component 12. Structurally, the buffer part 5 can be designed in block, ring, or other shapes. Taking the ring-shaped buffer part 5 as an example, it can be tightly fitted onto the lead screw 422 of the transmission component 42. When the lead screw 422 moves, the ring-shaped buffer part 5 can make uniform contact with the surrounding inner wall of the support component 12, dispersing the impact force and achieving a better buffering effect. Specifically, the buffer part 5 includes a positioning member 51 and a buffer ring 52. The positioning member 51 is fixedly connected to the transmission component 42. This fixed connection ensures the stability of the buffer part 5 on the transmission component 42, preventing shaking or displacement during use. The positioning element 51 can be fixed to the transmission assembly 42 in various ways, such as threaded connection, welding, or slot engagement. For the lead screw 422, threads can be machined at the end of the lead screw 422, and the positioning element 51 can be firmly fixed to the lead screw 422 by the locking element 53 and the washer 54. The buffer ring 52 is fitted onto the positioning element 51 and is usually made of elastic material, such as rubber or silicone, which can absorb energy when subjected to impact and reduce the impact force on the transmission assembly 42 and other components. The inner diameter of the buffer ring 52 matches the outer diameter of the positioning element 51 to ensure that the buffer ring 52 can be tightly fitted onto the positioning element 51 and will not easily fall off. At the same time, the outer diameter design of the buffer ring 52 should take into account its fit with the support assembly 12 to avoid interference with the support assembly 12 during the buffering process.

[0059] Reference Figure 1 and Figure 2 As shown, in one embodiment, the support assembly 12 includes two hollow support rods 121 arranged opposite to each other. Sleeves 23 are provided on both sides of the backrest mechanism 2, with each sleeve 23 corresponding to and slidingly fitted onto the two hollow support rods 121. A transmission assembly 42 is disposed within the sleeve 23 and extends into the hollow support rod 121, engaging with it.

[0060] In this embodiment, the hollow support rod 121 provides installation space for the transmission assembly 42. The material of the hollow support rod 121 must be selected to ensure sufficient strength and rigidity to support the weight of the entire backrest mechanism 2, the seat mechanism 3, and the user. The sliding engagement between the sleeve 23 and the hollow support rod 121 allows the backrest mechanism 2 to smoothly rise and fall along the length of the hollow support rod 121. The inner diameter of the sleeve 23 matches the outer diameter of the hollow support rod 121, ensuring a certain gap for smooth sliding without excessive gap that could cause the backrest mechanism 2 to wobble. To reduce frictional resistance during sliding, a lubrication layer can be provided on the inner wall of the sleeve 23 or the outer wall of the hollow support rod 121, such as by applying lubricating oil or installing wear-resistant sliding pads. There are two sets of transmission assemblies 42, each set housed within the sleeve 23 on either side and extending into and engaging with the hollow support rod 121. This dual-drive assembly 42 design provides a more balanced power output, ensuring the backrest mechanism 2 remains stable during lifting and lowering. The drive assembly 42 can take various forms, such as a lead screw 422 and nut mechanism, or a chain drive mechanism. Taking the structure of the drive assembly 42 as an example (as described in the previous embodiment), consisting of a nut 421, a lead screw 422, a first bevel gear 423, and a second bevel gear 424, the nut 421 is fixed inside the hollow support rod 121 or at its opening. The lead screw 422 is housed within the sleeve 23 and engages with the nut 421. One end of the lead screw 422 extends into the hollow support rod 121. When the power assembly 41 drives the lead screw 422 to rotate, the engagement of the nut 421 and the lead screw 422 causes the lead screw 422 to move axially along the nut 421, thereby causing the sleeve 23 to slide along the hollow support rod 121, thus achieving the lifting and lowering of the backrest mechanism 2.

[0061] Furthermore, in one embodiment, the backrest mechanism 2 is also provided with a handle assembly 24, and the sleeve 23 extends into the handle assembly 24 and communicates with the handle assembly 24. The handle assembly 24 includes a first housing and a second housing that are interlocked with each other, and a receiving cavity for accommodating the power assembly 41 is formed between the first housing and the second housing.

[0062] In this embodiment, the sleeve 23 extends into the handle assembly 24 and communicates with it. This design makes the structure of the backrest mechanism 2 more coherent and enhances the overall stability. The sleeve 23 extending into the handle assembly 24 not only provides a certain degree of support for the handle assembly 24, but also protects the internal transmission assembly 42 to a certain extent, reducing external interference. After the first housing and the second housing are fastened together, a cavity for accommodating the power assembly 41 is formed in the middle. This design utilizes the internal space of the handle assembly 24 to reasonably house the power assembly 41. On the one hand, it provides better protection for the power assembly 41, preventing it from being corroded by external factors such as dust and moisture, thus extending its service life; on the other hand, it hides the power assembly 41 inside the handle assembly 24, making the overall appearance of the adjustable chair more concise and aesthetically pleasing. The shape and size of the handle assembly 24 can be designed according to ergonomic principles to provide a comfortable grip and facilitate the user's movement of the adjustable chair. For example, the curvature and thickness of the handle assembly 24 can be optimized according to the gripping habits of human hands, and the surface can also be provided with anti-slip texture to enhance friction during use and prevent the hand from slipping.

[0063] Reference Figure 2 As shown, in one embodiment, the power assembly 41 further includes a power connector 413 for connecting to the controller.

[0064] In this embodiment, the power connector 413 can adopt a standardized interface, such as a common USB interface or Type-C interface. This design allows the adjustable chair to be easily connected to various power supply devices. In daily use of the adjustable chair, users can select appropriate power supply devices to connect to the power connector 413 according to the actual scenario to power and control the adjustable chair.

[0065] In one embodiment, the backrest mechanism 2 is further provided with connecting shafts 25 on both sides, and armrests 26 are rotatably connected to the connecting shafts 25.

[0066] In this embodiment, the user can support their body with the armrest 26 and position themselves on the seat mechanism 3; therefore, the armrest 26 itself needs to be sturdy and able to support the user's weight. In particular, the armrest 26 will not rotate or sag when the user applies force. The armrest 26 has a supported position and a retracted position along the path of rotation along the connecting shaft 25. The supported position generally corresponds to the position where the armrest 26 is parallel to the seat mechanism 3 when extended, and the retracted position corresponds to the position where the armrest 26 is parallel to the support assembly 12.

[0067] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0068] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," and "above" are used herein to describe the spatial positional relationship between one or more components or features shown in the figures and other components or features. It should be understood that spatial relative terms include not only the orientation of the component as depicted in the figures but also different orientations during use or operation. For example, if the components in the figures are inverted as a whole, "above" or "above other components or features" will include cases where the component is "below" or "under" other components or features. Thus, the exemplary term "above" can include both "above" and "below." Furthermore, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this document intends to include all such cases.

[0069] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, parts, components, and / or combinations thereof.

[0070] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in sequences other than those illustrated or described herein.

[0071] This disclosure has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this disclosure to the described embodiments. Furthermore, those skilled in the art will understand that this disclosure is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this disclosure, all of which fall within the scope of protection claimed by this disclosure. The scope of protection of this disclosure is defined by the appended claims and their equivalents.

Claims

1. A height-adjustable chair, characterized in that, It includes a support mechanism (1), a backrest mechanism (2), a seat mechanism (3), and a lifting mechanism (4); among which, The support mechanism (1) includes a base assembly (11) and a support assembly (12) connected to the base assembly (11); The backrest mechanism (2) is slidably connected to the support assembly (12), and the stool mechanism (3) is rotatably connected to the bottom of the backrest mechanism (2); The lifting mechanism (4) includes a power component (41) and two sets of transmission components (42) embedded in the backrest mechanism (2). The two sets of transmission components (42) are respectively located on both sides of the power component (41) and cooperate with the support component (12). The power component (41) is used to drive the two sets of transmission components (42) to synchronously drive the backrest mechanism (2) to slide along the length direction of the support component (12).

2. The adjustable chair according to claim 1, characterized in that, The power assembly (41) includes: The drive component (411) is fixed to the backrest mechanism (2); and An output shaft (412) is arranged along the width direction of the backrest mechanism (2). One end of the output shaft (412) is fixedly connected to the drive member (411), and the other end is engaged with the transmission assembly (42). The driving member (411) is used to drive the output shaft (412) to rotate about the axial direction of the output shaft (412).

3. The adjustable chair according to claim 2, characterized in that, The transmission assembly (42) includes: Nut (421) is fixed to the support assembly (12); The lead screw (422) is arranged along the length direction of the backrest mechanism (2) and cooperates with the nut (421); A first bevel gear (423) is disposed on the output shaft (412) at one end away from the drive member (411); and The second bevel gear (424) is disposed on one end of the lead screw (422) near the output shaft (412) and meshes with the first bevel gear (423). The second bevel gear (424) drives the lead screw (422) to rotate so that the lead screw (422) moves axially relative to the nut (421).

4. The adjustable chair according to claim 1, characterized in that, The backrest mechanism (2) is provided with a first limit switch (21) and a second limit switch (22), and the first limit switch (21) and the second limit switch (22) are spaced apart along the length direction of the backrest mechanism (2); The support assembly (12) is provided with a slider, which is configured to trigger the first limit switch (21) or the second limit switch (22); The first limit switch (21) is used to limit the backrest mechanism (2) to a first position, and the second limit switch (22) is used to limit the backrest mechanism (2) to a second position.

5. The adjustable chair according to claim 1, characterized in that, A buffer section (5) is provided at one end of the transmission assembly (42) away from the power assembly (41).

6. The adjustable chair according to claim 1, characterized in that, The support assembly (12) includes two hollow support rods (121) arranged opposite to each other; The backrest mechanism (2) is provided with sleeves (23) on both sides. The two sleeves (23) are fitted onto the two hollow support rods (121) in a one-to-one correspondence and form a sliding fit with the hollow support rods (121). The transmission assembly (42) is disposed inside the sleeve (23) and extends into the hollow support rod (121) to cooperate with the hollow support rod (121).

7. The adjustable chair according to claim 6, characterized in that, The backrest mechanism (2) is also provided with a handle assembly (24), and the sleeve (23) extends into the handle assembly (24) and communicates with the handle assembly (24); The handle assembly (24) includes a first housing and a second housing that are interlocked, and a receiving cavity for accommodating the power assembly (41) is formed between the first housing and the second housing.

8. The adjustable chair according to claim 1, characterized in that, The power assembly (41) also includes a power connector (413) for connecting the controller.

9. The adjustable chair according to claim 5, characterized in that, The buffer part (5) includes a positioning element (51) and a buffer ring (52). The positioning element (51) is fixedly connected to the transmission assembly (42), and the buffer ring (52) is sleeved on the positioning element (51).

10. The adjustable chair according to claim 1, characterized in that, The backrest mechanism (2) is also provided with connecting shafts (25) on both sides, and armrests (26) are rotatably connected to the connecting shafts (25).

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