Multifunctional flexibly-adjustable chair back and office chair

Abstract

The invention belongs to the field of office chairs, and particularly relates to a multifunctional flexibly-adjustable chair back, which comprises a backrest and an adjusting part, and the adjusting part is additionally arranged at the bottom of the backrest; the adjusting piece comprises a guide beam assembly, a movable seat, an angle adjusting disc and a turnover adjusting piece, and the movable seat is assembled on the guide beam assembly in a sliding mode; the guide beam assembly is used for adjusting the sliding position of the movable seat on the guide beam assembly; the angle adjusting disc is used for rotating on a transverse plane; the overturning adjusting piece is used for backwards overturning the backrest; a rotating point of the backrest is dynamically adjusted, so that the back of a user adapts to complex relative movement, arc movement of a leaning track of the backrest is movably adjusted, the displacement of the upper portion and the displacement of the lower portion of the backrest are consistent, and when the user changes the sitting posture, the curved surface of the backrest is continuously tightly attached to the physiological curve of the back of the human body; the office chair comprises a chair seat mounted on the multifunctional flexibly-adjustable chair back, and the chair seat and the guide beam assembly are assembled together.

Description

Technical Field

[0001] This invention relates to the field of office chairs, specifically to a multifunctional, flexibly adjustable chair back and office chair. Background Technology

[0002] Office chairs, as indispensable facilities in modern office environments, are closely related to ergonomics in their design, directly affecting user comfort and health. The chair back, as a crucial component supporting the user's back, has a structurally sound design and adjustable flexibility that are key indicators of its performance. An ideal office chair back should be able to adapt to different users' body shapes and sitting habits, providing consistent and stable support to the back whether the user is maintaining a seated posture or retracting to rest, thus relieving spinal pressure and preventing muscle fatigue and spinal injuries caused by prolonged fixed sitting positions.

[0003] Currently, there are various ways to connect the backrest and seat in existing office chairs. Common forms include fixed connections, single-angle adjustment connections via a pivot, and linkage connections using a synchronous tilting mechanism. Fixed connections maintain a fixed relative position between the backrest and seat, making them unsuitable for varying user postures. Single-angle adjustment typically allows the backrest to switch between and lock multiple positions, but its rotation center is usually fixed at a specific point on the rear of the seat or the connecting bracket. Synchronous tilting mechanisms use linkages or sliders to cause a certain degree of linkage between the backrest and the seat when the backrest tilts backward, but the backrest's rotation trajectory is still limited by a pre-set mechanical structure, and the rotation point is relatively fixed.

[0004] For office chairs with reclining adjustment, the backrest experiences complex relative motion with the user's back as it tilts backward around a fixed pivot point. Because the pivot point is fixed, the backrest's tilting trajectory is an arc around that point. This results in inconsistent displacement between the upper and lower parts of the backrest, making it difficult to maintain a close fit between the backrest's curve and the user's natural back curve when changing posture. Crucially, near the connection between the backrest and seat, as the backrest tilts backward, this area often experiences abrupt shifts in position or angle relative to the user's waist and hips. This causes a shift in lumbar support or weakened support, disrupting the optimal fit and severely impacting user comfort and lumbar support when reclining. Summary of the Invention

[0005] For office chairs with adjustable backrests, the backrest experiences complex relative motion with the user's back as it tilts backward around a fixed pivot point. Because the pivot point is fixed, the backrest's tilting trajectory is an arc around that point. This results in inconsistent displacement between the upper and lower parts of the backrest, making it difficult to maintain a close fit between the backrest's curvature and the user's back's physiological curve when the user changes posture. To achieve the above objectives, this invention provides the following technical solution:

[0006] A multi-functional, flexible adjustable chair back includes a backrest and an adjustment mechanism, wherein the adjustment mechanism is mounted on the bottom of the backrest; the adjustment mechanism includes:

[0007] Guide beam assembly;

[0008] A movable seat is slidably mounted on the guide beam assembly; the guide beam assembly is used to adjust the sliding position of the movable seat on the guide beam assembly.

[0009] An angle adjustment disc is mounted on the top of the movable base; the angle adjustment disc is used to rotate in the transverse plane.

[0010] A flip-up adjustment component, one end of which is mounted on the top of the angle adjustment disc and the other end of which is mounted on the bottom of the backrest; the flip-up adjustment component is used to flip the backrest backward.

[0011] It achieves dynamic adjustment of the backrest rotation point so that the user's back can adapt to complex relative movements, completing the arc movement of the backrest tilt trajectory. This ensures that the displacement of the upper and lower parts of the backrest is consistent, maintaining a close fit between the backrest curvature and the physiological curve of the human back when the user changes sitting posture. Even with sudden changes in the forward and backward displacement or angle of the user's waist and hips, it can also ensure the stability of the lumbar support position and lumbar support force, maintaining the original optimal fit with the back, and improving the user's comfort and lumbar support effect when reclining.

[0012] In a further embodiment, the guide beam assembly includes:

[0013] Base plate;

[0014] A guide beam is mounted on the top of the base plate, and the guide beam and the base plate are fixed together as a single unit; the guide beam is distributed parallel to the main body of the base plate.

[0015] Guide grooves are formed on the guide beam and are distributed parallel to the main body of the guide beam;

[0016] An electric telescopic rod is assembled inside a guide groove and is distributed parallel to the groove body but not connected to it; one end of the electric telescopic rod is fixed to the end of the guide groove.

[0017] The slider is slidably mounted on the guide groove; the slider is fixed to the end of the other end of the electric telescopic rod.

[0018] In a further embodiment, the movable seat is provided with a slot, and the movable seat is slidably assembled on the guide beam through the slot, with the slider fixed on the slot.

[0019] In a further embodiment, the angle adjustment dial includes:

[0020] A bottom support plate is mounted on a movable base; the bottom support plate is made of magnetic metal material.

[0021] A rotating disk is mounted on a base support disk via a rotating shaft; a gap is reserved between the base support disk and the rotating disk.

[0022] The limiting plate has its upper sidewall integrally fixed to the rotating disk, and its lower sidewall movably attached to the bottom support disk. An electromagnetic coil is laid on the contact surface of the limiting plate near the bottom support disk. When energized, the electromagnetic coil has magnetism and is used to magnetically attract and limit the limiting plate to the support disk.

[0023] In a further embodiment, the flipping adjustment member includes:

[0024] A positioning connector, which is mounted on a movable base;

[0025] A movable connector, one end of which is fitted onto a positioning connector, and the other end of which is mounted on the backrest.

[0026] In a further embodiment, the positioning connector includes:

[0027] U-shaped support plate, wherein the U-shaped support plate is integrally fixed on the movable base;

[0028] A fixed column is horizontally mounted on top of the U-shaped support plate;

[0029] Two positioning holes are respectively opened at both ends of the fixed column; the positioning holes are located on the column centerline of the fixed column;

[0030] A connecting ring, which is sleeved and fixed on a fixed post.

[0031] In a further embodiment, multiple sets of electromagnetic coils are laid on the outer surface of the connecting ring. When energized, the electromagnetic coils are magnetic and used to magnetically attract and limit the connecting ring to the movable connector.

[0032] In a further embodiment, the movable connector includes:

[0033] A fixing plate, which is fixed to the backrest;

[0034] Two connecting plates a are distributed on a fixed plate, and the connecting plates a and the fixed plate are perpendicularly distributed; the connecting plates a and the fixed plate are integrally fixedly connected.

[0035] Connecting plate b, which is integrally fixed to the fixing plate;

[0036] The positioning ring is integrally fixed to the end of the connecting plate b; the positioning ring is used to rotatably sleeve on the outside of the fixed column;

[0037] The limiting groove is formed inside the positioning ring; the limiting groove is used to be rotatably sleeved on the outside of the connecting ring.

[0038] In a further embodiment, the movable connector further includes two positioning posts, which are respectively distributed on two connecting plates a; the positioning posts and the connecting plates a are perpendicularly distributed; the positioning posts are rotatably assembled inside the positioning holes, and torsion springs are provided inside the positioning holes to cooperate with the positioning posts.

[0039] In summary: Multiple sets of electromagnetic coils are laid on the outer surface of the disconnected connecting ring of the adjustment component. When the electromagnetic coils are de-energized, they lose their magnetism, releasing the limits of the positioning connector and the movable connector. The movable connector rotates on the fixed post of the positioning connector using the positioning ring and positioning post, completing the backrest's backward tilt around the flip adjustment component. During this process, the guide beam assembly activates the electric telescopic rod's extension and retraction. During this process, the electric telescopic rod drives the moving seat along the guide groove on the guide beam via a slider, completing the adjustment of the sliding position of the moving seat, angle adjustment disc, flip adjustment component, and backrest on the guide beam assembly. Furthermore, with the de-energization of the second electromagnetic coil, the limits of the bottom support plate and rotating disc are released. When the user exerts force with their back, the backrest can utilize the bottom support plate and rotating disc of the angle adjustment disc to rotate relative to each other on the lateral plane, dynamically adjusting the backrest's rotation point. This allows the user's back to adapt to complex relative movements, completing the arc motion of the backrest's tilt trajectory, ensuring consistent displacement between the upper and lower parts of the backrest, and maintaining a close fit between the backrest's curved surface and the physiological curve of the human back when the user changes their sitting posture.

[0040] In the coordinated operation of the tilting adjustment component and the guide beam assembly, when the backrest tilts backward, the tilting adjustment component releases the limiting position of the positioning connector and the movable connector by de-energizing the electromagnetic coil, allowing the backrest to gain the freedom to rotate around that point. At the same time, the guide beam assembly does not passively wait, but actively activates the electric telescopic rod, which drives the moving seat to slide along the guide groove through the slider. This coordination realizes the synchronous performance of tilting and sliding movements. While the backrest rotates around a certain point, that point of rotation itself is also displaced along the guide beam, thus transforming a single circular motion into a complex "rolling" motion trajectory.

[0041] In the linkage between the angle adjustment disc, the flip adjustment component, and the guide beam assembly, the bottom support disc and the rotating disc in the angle adjustment disc release the lateral limit after the electromagnetic coil is de-energized, allowing the backrest to rotate freely on the lateral plane when the user exerts force on their back. This degree of freedom, combined with the longitudinal tilting degree of freedom provided by the flip adjustment component and the forward and backward sliding degree of freedom provided by the guide beam assembly, forms a coordinated adjustment in three dimensions (longitudinal tilt, lateral torsion, and forward and backward displacement).

[0042] Another object of the present invention is to provide an office chair, including a seat mounted on the aforementioned multifunctional flexible adjustable backrest, the seat and guide beam assembly being assembled together; an armrest is mounted on each side of the seat, and a leg rest is mounted on the bottom of the seat; the seat is mounted on a five-star base; and a headrest is mounted on the top of the backrest.

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] 1. During the backward tilting process of the backrest around the flip adjustment mechanism, the guide beam assembly is used to adjust the sliding position of the moving seat, angle adjustment disc, flip adjustment mechanism, and backrest on the guide beam assembly. In addition, the angle adjustment disc rotates on the lateral plane to dynamically adjust the backrest rotation point, so that the user's back can adapt to complex relative movements and complete the arc movement of the backrest tilting trajectory. This ensures that the displacement of the upper and lower parts of the backrest is consistent, and the backrest curvature continues to closely fit the physiological curve of the human back when the user changes sitting posture. Even with the abrupt displacement or angle change of the user's waist and hips, the lumbar support position and lumbar support force are also kept stable, ensuring the original optimal fit with the backrest and improving the user's comfort and lumbar support effect when reclining.

[0045] 2. In existing technologies, regardless of the tilting mechanism used, the rotation center of the backrest is relatively fixed at any given moment. However, with the coordination of the angle adjustment disc, the tilt adjustment component, and the guide beam assembly, the rotation center can move continuously along the guide beam during the tilting process of the backrest, and can also deflect around the transverse axis of the angle adjustment disc. This means that the movement trajectory of the backrest is no longer a simple arc around a certain point, but can adjust the position and direction of the rotation point in real time according to the actual posture of the user's back, achieving the effect of the rotation point moving with the backrest.

[0046] 3. In conventional tilting structures with fixed rotation points, there is a significant difference in the displacement between the upper and lower parts of the backrest (the upper part has a longer arc length, while the lower part has a smaller arc length), which causes relative slippage between the backrest surface and the backrest surface. In this invention, the guide beam assembly actively adjusts the front and rear positions of the rotation point while tilting, which compensates for the displacement of the lower part of the backrest. This allows the upper and lower parts of the backrest to move in sync with the user's back, truly achieving a close fit between the backrest surface and the physiological curve of the human back that is maintained continuously during dynamic processes.

[0047] 4. The present invention uses the sliding of the guide beam assembly and the lateral rotation of the angle adjustment disc to make the lower end of the backrest and the seat connection area actively follow the natural displacement of the user's waist and hips when the backrest is tilted, thereby eliminating the problem of the lumbar support point being pushed forward or pulled back in the traditional structure, and achieving dual stability of the lumbar support position and support force in the tilted posture.

[0048] 5. The angle adjustment disc responds passively when the user exerts force with their back, while the guide beam assembly is actively driven by an electric telescopic rod. The fusion of passive response and active drive allows the backrest to sensitively follow the user's slight posture changes (passive side) while also compensating for geometric deviations during large-scale posture adjustments (active side) through electric control of the electric telescopic rod. This "semi-active" adjustment method is extremely rare in existing office chairs. It allows users to obtain a continuously optimized fit without conscious operation, reducing the cognitive burden of adjustment operations. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the structure of the office chair of the present invention;

[0051] Figure 2 for Figure 1 Schematic diagram of the structure of the adjustment component;

[0052] Figure 3 for Figure 2 Schematic diagram of the center guide beam assembly;

[0053] Figure 4 for Figure 2 Schematic diagram of the structure after the guide beam assembly of the adjustment component is removed;

[0054] Figure 5 for Figure 2 Schematic diagram of the moving base;

[0055] Figure 6 for Figure 2 Schematic diagram of the center angle adjustment dial;

[0056] Figure 7 for Figure 2 Schematic diagram of the structure of the tilting adjustment component;

[0057] Figure 8for Figure 7 Schematic diagram of the structure of the movable connector;

[0058] Figure 9 for Figure 7 Schematic diagram of the positioning connector;

[0059] Figure 10 for Figure 1 A schematic diagram of the assembly structure of the multi-functional flexible adjustable chair back.

[0060] Legend:

[0061] 1-Headrest, 2-Backrest, 3-Armrest, 4-Seat, 5-Leg rest, 6-Five-star base, 7-Adjusting component; 71-Guide beam assembly, 72-Moving seat, 73-Angle adjustment disc, 74-Flip adjustment component; 711-Slider, 712-Guide groove, 713-Guide beam, 714-Base plate, 715-Electric telescopic rod; 721-Slot; 731-Bottom support plate, 732-Rotating disc, 733-Limiting plate; 741-Modible connector, 742-Positioning connector; 7411-Fixed plate, 7412-Connecting plate a, 7413-Positioning post, 7414-Limiting groove, 7415-Positioning ring, 7416-Connecting plate b; 7421-Connecting ring, 7422-Fixed post, 7423-Positioning hole, 7424-U-shaped support plate. Detailed Implementation

[0062] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0063] In one embodiment of the present invention, such as Figure 1 , Figure 2 and Figure 10 As shown: A multi-functional, flexible adjustable chair back includes a backrest 2 and an adjusting component 7, wherein the adjusting component 7 is attached to the bottom of the backrest 2; the adjusting component 7 includes:

[0064] Guide beam assembly 71;

[0065] A movable seat 72 is slidably mounted on the guide beam assembly 71; the guide beam assembly 71 is used to adjust the sliding position of the movable seat 72 on the guide beam assembly 71.

[0066] An angle adjustment disc 73 is mounted on the top of the movable seat 72; the angle adjustment disc 73 is used to rotate in the transverse plane (here the transverse plane is the plane formed by the X-axis and Y-axis; while the surface of the backrest 2 that flips backward is the plane formed by the Z-axis and Y-axis).

[0067] The flip adjustment component 74 is mounted on the top of the angle adjustment disk 73 at one end and on the bottom of the backrest 2 at the other end; the flip adjustment component 74 is used to flip the backrest 2 backward.

[0068] Therefore, during the backward tilting of the backrest 2 around the flip adjustment component 74, the guide beam assembly 71 is used to adjust the sliding positions of the movable seat 72, angle adjustment disc 73, flip adjustment component 74, and backrest 2 on the guide beam assembly 71. In addition, the angle adjustment disc 73 rotates on the lateral plane to dynamically adjust the rotation point of the backrest 2, so that the user's back can adapt to complex relative movements and complete the arc movement of the tilting trajectory of the backrest 2. This ensures that the displacement of the upper and lower parts of the backrest 2 is consistent, and the backrest surface continues to closely fit the physiological curve of the human back when the user changes sitting posture. Even with the abrupt displacement or angle change of the user's waist and hips, the lumbar support position and lumbar support force are also kept stable, ensuring the original optimal fit with the back, and improving the user's comfort and lumbar support effect in the backward tilting state.

[0069] In another embodiment of the present invention, such as Figure 2 and Figure 3 As shown: The guide beam assembly 71 includes:

[0070] Base plate 714;

[0071] Guide beam 713 is assembled on the top of the base plate 714, and the guide beam 713 and the base plate 714 are fixed together as a whole; the guide beam 713 is distributed parallel to the main body of the base plate 714.

[0072] Guide groove 712, the guide groove 712 is formed on guide beam 713 and is distributed parallel to the main body of guide beam 713;

[0073] An electric telescopic rod 715 is assembled inside a guide groove 712 and is distributed parallel to the groove body of the guide groove 712, but not connected to it; one end of the electric telescopic rod 715 is fixed to the end of the guide groove 712.

[0074] The slider 711 is slidably mounted on the guide groove 712; the slider 711 is fixed to the end of the other end of the electric telescopic rod 715.

[0075] The electric telescopic pole 715 and its power supply wiring method are existing technologies. Their detailed structure can be found in existing literature and journals, and they can also be purchased directly on the market, or components can be purchased on the market to assemble them, etc.; they are not what this invention is meant to protect, and will not be described in detail here.

[0076] like Figures 2-5As shown: The movable seat 72 has a slot 721, and the movable seat 72 is slidably mounted on the guide beam 713 through the slot 721. The slider 711 is fixed on the slot 721.

[0077] Therefore, during the process of the backrest 2 tilting backward around the flip adjustment member 74, the guide beam assembly 71 activates the extension and retraction of the electric telescopic rod 715. During the extension and retraction process, the electric telescopic rod 715 drives the movable seat 72 to move along the guide groove 712 on the guide beam 713 via the slider 711, thereby completing the adjustment of the sliding position of the movable seat 72, the angle adjustment disc 73, the flip adjustment member 74, and the backrest 2 on the guide beam assembly 71 using the guide beam assembly 71. In addition, the angle adjustment disc 73 rotates on the lateral plane to achieve dynamic adjustment of the rotation point of the backrest 2.

[0078] In another embodiment of the present invention, such as Figure 2 and Figure 6 As shown: The angle adjustment dial 73 includes:

[0079] A bottom support plate 731 is mounted on a movable base 72; the bottom support plate 731 is made of magnetic metal material.

[0080] A rotating disk 732 is rotatably mounted on a bottom support disk 731 via a rotating shaft; a gap is reserved between the bottom support disk 731 and the rotating disk 732.

[0081] The limiting plate 733 has its upper sidewall integrally fixed to the rotating disk 732, and its lower sidewall movably attached to the bottom support disk 731. An electromagnetic coil is laid on the contact surface of the limiting plate 733 near the bottom support disk 731. The electromagnetic coil has magnetism after being energized, which is used to magnetically attract and limit the limiting plate 733 to the support disk 731.

[0082] Therefore, during the process of the backrest 2 tilting backward around the flip adjustment member 74, the guide beam assembly 71 is used to adjust the sliding position of the moving seat 72, the angle adjustment plate 73, the flip adjustment member 74, and the backrest 2 on the guide beam assembly 71; in addition, after disconnecting the power of the electromagnetic coil one and releasing the limit of the bottom support plate 731 and the rotating plate 732, when the user exerts force on his back, the backrest 2 can use the bottom support plate 731 and the rotating plate 732 of the angle adjustment plate 73 to rotate relative to each other on the horizontal plane, so as to dynamically adjust the rotation point of the backrest 2, so that the user's back can adapt to the complex relative movement and complete the arc movement of the tilting trajectory of the backrest 2, so that the displacement of the upper and lower parts of the backrest 2 is consistent, and the backrest surface continues to closely fit the physiological curve of the human back when the user changes his sitting posture.

[0083] In another embodiment of the present invention, such as Figure 2 , Figure 4 and Figure 7As shown: The flipping adjustment member 74 includes:

[0084] Positioning connector 742, which is mounted on movable base 72;

[0085] The movable connector 741 is fitted at one end to the positioning connector 742 and at the other end to the backrest 2.

[0086] like Figure 2 , Figure 7 and Figure 9 As shown: The positioning connector 742 includes:

[0087] U-shaped support plate 7424, which is integrally fixed on the movable seat 72;

[0088] A fixing column 7422 is horizontally mounted on top of a U-shaped support plate 7424;

[0089] Two positioning holes 7423 are respectively opened at both ends of the fixing post 7422; the positioning holes 7423 are located on the column center line of the fixing post 7422;

[0090] A connecting ring 7421 is sleeved and fixed on a fixing post 7422.

[0091] like Figure 9 As shown: Multiple sets of electromagnetic coils are laid on the outer surface of the connecting ring 7421. When the electromagnetic coils are energized, they become magnetic and are used to magnetically attract and limit the connecting ring 7421 to the movable connector 741.

[0092] like Figure 2 , Figure 7 and Figure 8 As shown: The movable connector 741 includes:

[0093] A fixing plate 7411 is fixed to the backrest 2;

[0094] Two connecting plates a7412 are distributed on a fixed plate 7411, and the connecting plates a7412 and the fixed plate 7411 are vertically distributed; the connecting plates a7412 and the fixed plate 7411 are integrally fixedly connected.

[0095] Connecting plate b7416, which is integrally fixed to fixing plate 7411;

[0096] Positioning ring 7415 is integrally fixed to the end of connecting plate b7416; positioning ring 7415 is used to rotatably sleeve on the outside of fixed post 7422.

[0097] The limiting groove 7414 is formed inside the positioning ring 7415; the limiting groove 7414 is used to be rotatably sleeved on the outside of the connecting ring 7421.

[0098] like Figure 2 , Figures 7-9 As shown: The movable connector 741 also includes two positioning posts 7413, which are respectively distributed on two connecting plates a7412; the positioning posts 7413 and the connecting plates a7412 are vertically distributed; the positioning posts 7413 are rotatably assembled inside the positioning holes 7423, and torsion springs are provided inside the positioning holes 7423 to cooperate with the positioning posts 7413.

[0099] Therefore, the multiple sets of electromagnetic coils 2 laid on the outer surface of the disconnecting connecting ring 7421 of the adjustment component 74 lose their magnetism after the electromagnetic coils 2 are de-energized, releasing the limiting position of the positioning connector 742 and the movable connector 741. The movable connector 741 rotates on the fixed post 7422 of the positioning connector 742 using the positioning ring 7415 and the positioning post 7413, completing the backrest 2 to tilt backward around the flip adjustment component 74. During this process, the guide beam assembly 71 is used to adjust the sliding position of the moving seat 72, the angle adjustment disk 73, the flip adjustment component 74 and the backrest 2 on the guide beam assembly 71. In addition, the angle adjustment disk 73 rotates on the horizontal plane to realize the dynamic adjustment of the rotation point of the backrest 2, so that the user's back can adapt to the complex relative movement and complete the arc movement of the tilting trajectory of the backrest 2, so that the displacement of the upper and lower parts of the backrest 2 is consistent, and the backrest surface continues to closely fit the physiological curve of the human back when the user changes the sitting posture.

[0100] In summary: The multiple sets of electromagnetic coils laid on the outer surface of the disconnecting connecting ring 7421 of the adjustment component 74 lose their magnetism after the electromagnetic coils are de-energized, releasing the limiting positions of the positioning connecting component 742 and the movable connecting component 741. The movable connecting component 741 rotates on the fixed post 7422 of the positioning connecting component 742 using the positioning ring 7415 and the positioning post 7413, completing the backrest 2's backward tilt around the flip adjustment component 74. During this process, the guide beam assembly 71 activates the extension and retraction of the electric telescopic rod 715. During extension and retraction, the electric telescopic rod 715 drives the moving seat 72 to move along the guide groove 712 on the guide beam 713 via the slider 711, completing the adjustment using the guide beam assembly 71. The sliding positions of the movable seat 72, angle adjustment disc 73, flip adjustment component 74, and backrest 2 on the guide beam assembly 71; in addition, after disconnecting the power supply of the second electromagnetic coil and releasing the limit of the bottom support disc 731 and the rotating disc 732, when the user exerts force on their back, the backrest 2 can use the bottom support disc 731 and the rotating disc 732 of the angle adjustment disc 73 to rotate relative to each other on the horizontal plane, so as to dynamically adjust the rotation point of the backrest 2, so that the user's back can adapt to the complex relative movement and complete the arc movement of the tilt trajectory of the backrest 2, so that the displacement of the upper and lower parts of the backrest 2 is consistent, and the backrest surface continues to closely fit the physiological curve of the human back when the user changes the sitting posture.

[0101] In the linkage between the tilting adjustment component 74 and the guide beam assembly 71, when the backrest 2 tilts backward, the tilting adjustment component 74 releases the limiting position of the positioning connector 742 and the movable connector 741 by de-energizing the electromagnetic coil 2, allowing the backrest 2 to gain the freedom to rotate around that point; at the same time, the guide beam assembly 71 does not passively wait, but actively activates the electric telescopic rod 715, which drives the moving seat 72 to slide along the guide groove 712 through the slider 711; this linkage realizes the synchronous performance of tilting and sliding actions. While the backrest 2 rotates around a certain point, the point of rotation itself is also displaced along the guide beam, thus transforming the single circular motion into a compound "rolling" motion trajectory.

[0102] In the linkage between the angle adjustment disc 73, the flip adjustment component 74, and the guide beam assembly 71, the bottom support disc 731 and the rotating disc 732 in the angle adjustment disc 73 are released from lateral restriction after the electromagnetic coil is de-energized, so that the backrest 2 can rotate freely on the lateral plane when the user exerts force on the back. This degree of freedom, combined with the longitudinal tilting degree of freedom provided by the flip adjustment component 74 and the front and back sliding degree of freedom provided by the guide beam assembly 71, forms a coordinated adjustment of three dimensions (longitudinal tilt, lateral torsion, and front and back displacement).

[0103] In the prior art, regardless of the tilting mechanism used, the rotation center of the backrest 2 is relatively fixed at any given moment. However, when the angle adjustment disc 73, the tilt adjustment component 74, and the guide beam assembly 71 work together, the rotation center can move continuously along the guide beam 713 during the tilting process of the backrest 2, and can also deflect around the transverse axis of the angle adjustment disc 73. This means that the movement trajectory of the backrest 2 is no longer a simple arc around a certain point, but can adjust the position and direction of the rotation point in real time according to the actual posture of the user's back, thus achieving the effect of the rotation point moving with the backrest.

[0104] In conventional tilting structures with fixed rotation points, there is a significant difference in the displacement between the upper and lower parts of the backrest 2 (the upper part has a longer arc length, while the lower part has a smaller arc length), causing relative slippage between the curved surface of the backrest 2 and the curved surface of the back. In this invention, the guide beam assembly 71 actively adjusts the front and rear positions of the rotation point while tilting, thereby compensating for the displacement of the lower part of the backrest 2. This allows the upper and lower parts of the backrest 2 to move in sync with the user's back, truly achieving a close fit between the curved surface of the chair back and the physiological curve of the human back, which is maintained continuously during dynamic processes.

[0105] In another embodiment of the present invention, an office chair is provided, such as... Figure 1 As shown: a seat 4 is installed on the multi-functional flexible adjustable backrest described above, and the seat 4 and the guide beam assembly 71 are assembled together; an armrest 3 is installed on each side of the seat 4, and a leg rest 5 is installed at the bottom of the seat 4; the seat 4 is mounted on a five-star base 6; and a headrest 1 is installed on the top of the backrest 2.

[0106] The present invention uses the sliding of the guide beam assembly 71 and the lateral rotation of the angle adjustment disc 73 to make the lower end of the backrest 2 and the connection area between the backrest 2 and the seat 4 actively follow the natural displacement of the user's waist and hips when the backrest 2 is tilted, thereby eliminating the problem of the lumbar support point being pushed forward or backward in the traditional structure, and achieving dual stability of the lumbar support position and support force in the tilted posture.

[0107] The angle adjustment disc 73 passively responds when the user exerts force with their back, while the guide beam assembly 71 is actively driven by the electric telescopic rod 715. The fusion of passive response and active drive allows the backrest 2 to sensitively follow the user's slight posture changes (passive side) and compensate for geometric deviations in large-range posture adjustments (active side) through electric control of the electric telescopic rod 715. This "semi-active" adjustment method is extremely rare in existing office chairs. It allows users to obtain a continuously optimized fit without deliberate operation, reducing the cognitive burden of adjustment operations.

[0108] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0109] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A multifunctional, flexible adjustable chair back, comprising a backrest (2) and an adjusting member (7), wherein the adjusting member (7) is mounted on the bottom of the backrest (2); characterized in that, Adjustment component (7) includes: Guide beam assembly (71); A movable seat (72) is slidably mounted on the guide beam assembly (71); the guide beam assembly (71) is used to adjust the sliding position of the movable seat (72) on the guide beam assembly (71); An angle adjustment disc (73) is mounted on top of the movable seat (72); the angle adjustment disc (73) is used to rotate in the transverse plane; A flip adjustment component (74) is mounted on the top of the angle adjustment disc (73) at one end and on the bottom of the backrest (2) at the other end; the flip adjustment component (74) is used to flip the backrest (2) backward.

2. The multifunctional flexible adjustable chair back according to claim 1, characterized in that, The guide beam assembly (71) includes: Base plate (714); A guide beam (713) is mounted on the top of the base plate (714), and the guide beam (713) and the base plate (714) are fixed together as a whole; the guide beam (713) is distributed parallel to the main body of the base plate (714); Guide groove (712), the guide groove (712) is opened on the guide beam (713) and is distributed parallel to the main body of the guide beam (713); An electric telescopic rod (715) is assembled inside a guide groove (712) and is distributed parallel to the groove of the guide groove (712) but not connected to it; one end of the electric telescopic rod (715) is fixed to the end of the guide groove (712). The slider (711) is slidably mounted on the guide groove (712); the slider (711) is fixed to the end of the other end of the electric telescopic rod (715).

3. The multifunctional flexible adjustable chair back according to claim 2, characterized in that, The movable seat (72) has a slot (721) and the movable seat (72) is slidably mounted on the guide beam (713) through the slot (721). The slider (711) is fixed on the slot (721).

4. The multifunctional flexible adjustable chair back according to claim 1, characterized in that, The angle adjustment dial (73) includes: A bottom support plate (731) is mounted on a movable base (72); the bottom support plate (731) is made of magnetic metal material; A rotating disk (732) is rotatably mounted on a bottom support disk (731) via a rotating shaft; a gap is reserved between the bottom support disk (731) and the rotating disk (732); The upper side wall of the limiting plate (733) is integrally fixed on the rotating disk (732), and the lower side wall is movably attached to the bottom support disk (731). An electromagnetic coil is laid on the contact surface of the limiting plate (733) near the bottom support disk (731). The electromagnetic coil has magnetism after being energized and is used to magnetically attract and limit the limiting plate (733) to the support disk (731).

5. The multifunctional flexible adjustable chair back according to claim 1, characterized in that, The flip adjustment member (74) includes: Positioning connector (742), which is mounted on the movable base (72); The movable connector (741) is mounted on the positioning connector (742) at one end and on the backrest (2) at the other end.

6. The multifunctional flexible adjustable chair back according to claim 5, characterized in that, The positioning connector (742) includes: U-shaped support plate (7424), the U-shaped support plate (7424) is integrally fixed on the movable seat (72); A fixed column (7422) is horizontally mounted on top of a U-shaped support plate (7424); Two positioning holes (7423) are respectively opened at both ends of the fixed column (7422); the positioning holes (7423) are located on the column center line of the fixed column (7422); A connecting ring (7421) is sleeved and fixed on a fixed post (7422).

7. The multifunctional flexible adjustable chair back according to claim 6, characterized in that, Multiple sets of electromagnetic coils are laid on the outer surface of the connecting ring (7421). When the electromagnetic coils are energized, they are magnetic and used to magnetically attract and limit the connecting ring (7421) to the movable connector (741).

8. The multifunctional flexible adjustable chair back according to claim 7, characterized in that, The movable connector (741) includes: A fixing plate (7411) is fixed to the backrest (2); Two connecting plates a (7412) are distributed on a fixed plate (7411), and the connecting plates a (7412) and the fixed plate (7411) are vertically distributed; the connecting plates a (7412) and the fixed plate (7411) are integrally fixedly connected; Connecting plate b (7416), the connecting plate b (7416) is integrally fixed on the fixing plate (7411); Positioning ring (7415), the positioning ring (7415) is integrally fixed to the end of the connecting plate b (7416); the positioning ring (7415) is used to rotatably sleeve on the outside of the fixed column (7422); The limiting groove (7414) is formed inside the positioning ring (7415); the limiting groove (7414) is used to be rotatably sleeved on the outside of the connecting ring (7421).

9. The multifunctional flexible adjustable chair back according to claim 8, characterized in that, The movable connector (741) also includes two positioning posts (7413), which are respectively distributed on two connecting plates a (7412); the positioning posts (7413) and the connecting plates a (7412) are vertically distributed; the positioning posts (7413) are rotatably assembled inside the positioning holes (7423), and torsion springs are provided inside the positioning holes (7423) to cooperate with the positioning posts (7413).

10. An office chair, characterized in that, Includes a seat (4) installed on a multi-functional flexible adjustable backrest according to any one of claims 1-9, the seat (4) and the guide beam assembly (71) being assembled together; an armrest (3) is installed on each side of the seat (4), and a leg rest (5) is installed at the bottom of the seat (4); the seat (4) is mounted on a five-star base (6); and a headrest (1) is installed on the top of the backrest (2).

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