Multifunctional office chair

Abstract

The application provides a multifunctional office chair, which is characterized in that an arc-shaped frame is arranged at the bottom of a seat structure and is rotatably supported on a seat frame structure, and a power unit drives the arc-shaped frame to swing to realize rocking. The seat structure comprises a seat plate, a backrest, an angle adjusting unit and a spring supporting unit. The front end of the arc-shaped frame is provided with a front side support, and the rear end is provided with a fixed support groove; the front end of the seat plate is rotatably connected to the front side support, and the bottom of the backrest is provided with a movable support rod with a horizontal support shaft. The angle adjusting track of the backrest is divided into two sections: when the horizontal support shaft is located in the fixed support groove, the rear section of the seat plate is hard supported by the movable support rod; after the horizontal support shaft is separated from the fixed support groove, the rear section of the seat plate is soft supported by the spring supporting unit, thereby realizing automatic switching between rigid locking in a sitting position and elastic supporting in a lying position. The application integrates sitting, lying and rocking functions, automatically converts between soft and hard supporting, and makes the body feel softer during rocking due to spring buffering, thereby improving comfort and adaptability.

Description

Technical Field

[0001] This invention relates to the field of seating technology, and more specifically to a multifunctional office chair. Background Technology

[0002] Office chairs are indispensable items for office workers in their daily work. Currently, most office chairs on the market have relatively simple functions, mainly providing support in a seated position, and cannot meet the needs of office workers to rest or relax during work breaks.

[0003] With the fast pace and increasing work pressure of modern office work, office workers need short breaks and relaxation during work intervals to relieve fatigue and improve work efficiency. However, existing office chairs can only provide a sitting position and cannot be transformed into a reclining position for users to rest, nor can they provide a rocking function to help users relax.

[0004] While some reclining office chairs or rocking chairs exist on the market, these products typically have limited functionality. They either only offer the ability to switch between sitting and reclining positions without rocking, or they only provide rocking without offering the stable sitting posture required for office work. Furthermore, existing products are cumbersome to operate during the sitting-to-reclining transition, requiring multiple steps to complete the positional change, making them inconvenient to use. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, a multifunctional office chair is provided, which simultaneously offers sitting, reclining, and rocking functions, and meets both user-driven and electrically driven rocking needs.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A multi-functional office chair, characterized by: including The seat frame structure has a roller structure at its bottom; The seat structure has an arc-shaped frame at the bottom, and the seat structure is supported on the seat frame structure by rotating the arc-shaped frame; The power unit is located on the seat frame structure and connected between the seat frame structure and the arc-shaped frame of the seat structure, driving the seat structure to rotate on the seat frame structure. The seat structure includes a seat plate, a backrest, an angle adjustment unit, and a spring support unit. The lower end of the backrest is rotatably connected to the rear side of the seat plate. The angle adjustment unit is connected between the seat plate and the backrest to adjust the angle between them. The front end of the arc frame is fixedly provided with a front support, and the rear end is provided with a fixed support groove. The front end of the seat plate is rotatably connected to the front support. The bottom end of the backrest extends downward and is fixedly provided with a movable support rod. The end of the movable support rod is fixedly provided with a horizontal support shaft. The spring support unit is connected between the seat plate and the arc frame. The backrest angle adjustment trajectory is divided into two segments. One segment corresponds to the horizontal support shaft being located in the fixed support groove, and the rear section of the seat plate being supported on the arc frame by the movable support rod. The other segment corresponds to the horizontal support shaft being detached from the fixed support groove, and the rear section of the seat plate being supported on the arc frame by the spring support unit.

[0007] According to the above technical solution, the arc-shaped frame includes arc-shaped rods, arc-shaped plates, and crossbars; multiple arc-shaped rods are arranged in parallel, multiple crossbars are arranged in parallel, and a single crossbar is simultaneously fixedly connected between the arc-shaped rods; the arc-shaped plate is connected between two adjacent crossbars; a movable support rod is fixed at one end of the arc-shaped rod, and a fixed support groove is provided at the other end of the arc-shaped rod; a power unit is connected between the arc-shaped plate and the seat frame structure, and the two ends of the spring support unit are fixedly connected between the arc-shaped plate and the seat plate.

[0008] According to the above technical solution, the arc-shaped frame further includes a positioning connecting plate and positioning rods; the positioning connecting plate includes an arc-shaped segment and a connecting segment; the arc-shaped segment and the arc-shaped rods are arranged in parallel at intervals, and multiple positioning rods are arranged at intervals between the arc-shaped segment and the arc-shaped rods, with positioning grooves formed between adjacent positioning rods, and positioning teeth matching the positioning grooves are provided on the frame structure; the top end of the connecting segment is integrally formed with the arc-shaped segment, and a limiting pin is fixedly provided at the bottom end of the connecting segment, and an arc-shaped groove matching the limiting pin is provided on the frame structure.

[0009] According to the above technical solution, the arc frame includes two arc rods, two crossbars, and one arc plate.

[0010] According to the above technical solution, the fixed support groove is provided in two sections, including an inner fixed support section and an outer guide section; as the backrest rotates, the horizontal support shaft at the end of the movable rod fixed on the backrest is placed at different points within the fixed support section.

[0011] According to the above technical solution, the power unit includes a battery, a motor, a crank, a drive shaft, and a drive arm; the motor and the battery are fixed on the frame structure and electrically connected; the output shaft of the motor is connected to one end of the crank, and the drive shaft is fixed at the other end of the crank; the top of the drive arm is fixed on the arc frame, and a vertical drive groove is provided on the drive arm, with the drive shaft placed in the drive groove.

[0012] According to the above technical solution, the frame structure includes a base frame, a central column, and a seat frame. The roller structure is installed at the bottom of the base frame, and the bottom end of the central column is fixed on the base frame, and the central column is vertically arranged. A central column outer tube is set on the seat frame, and the central column is placed inside the central column outer tube. A limiting part is provided between the two, and the central column can only rotate inside the central column outer tube.

[0013] According to the above technical solution, the seat structure also includes an armrest and footrest assembly; The handrail and foot pedal structure includes a handrail, a short foot pedal support, a long foot pedal support, a foot pedal bracket, and a foot pedal. The foot pedal bracket, handrail, and seat are arranged in parallel. The two ends of the short foot pedal support are rotatably connected to the foot pedal bracket and the seat, respectively. The bottom of the long foot pedal support is rotatably connected to the foot pedal bracket, the middle part is rotatably connected to the seat, and the top is rotatably connected to the handrail. The long foot pedal support is divided into an upper section and a lower section, with the point of rotation on the seat as the boundary. The upper section of the long foot pedal support, seat plate, backrest, and armrest form a parallelogram structure; the lower section of the long foot pedal support, seat plate, short foot pedal support, and foot pedal bracket form a parallelogram structure; the foot pedal is rotatably connected to the foot pedal bracket, and there is a pin and multiple sets of pin holes between the two for adjusting the angle between the foot pedal and the foot pedal bracket.

[0014] According to the above technical solution, the angle adjustment unit includes a locking disc, a torsion spring, a handle, and a return spring; the locking disc is fixed to the backrest base, a first rotating shaft is provided on the seat plate, and the locking disc has a rotating shaft hole that matches the first rotating shaft. The backrest is rotatably connected to the seat plate through the locking disc; the torsion spring is connected between the locking disc and the first rotating shaft, the handle is rotatably connected to the seat plate, and the return spring is connected between the handle and the seat plate; the locking disc has multiple locking slots, and different locking slots correspond to different included angles between the backrest and the seat plate; a second rotating shaft is fixed on the seat plate, the middle part of the handle is rotatably connected to the seat plate through the second rotating shaft, and the non-grip end of the handle has a locking connector that matches the locking slot.

[0015] According to the above technical solution, the roller structure includes several universal wheels with braking function; the spring support unit is a spring.

[0016] The present invention has the following beneficial effects: 1. Integrating the functions of a seat, recliner, and rocking chair into one, users can freely switch between "sitting upright," "lying down," and "electric rocking" states as needed. This not only meets daily office needs but also allows for lunch breaks and relaxation, significantly enhancing the usability of the office chair while saving space and purchase costs.

[0017] Secondly, the front end of the seat is rotatably connected to the arc-shaped frame via a front support, and the rear end of the seat has two types of support: one is a rigid support composed of "movable support rods and arc-shaped frame", and the other is a soft support composed of "elastic support units". The two support methods are related to the angle between the backrest and the seat. When the backrest is adjusted from a vertical sitting position to a reclining position, it automatically switches from rigid support to soft support. This not only meets the user's need to manually rock the recliner, but also makes the user's experience more gentle during rocking, thereby improving the user's comfort.

[0018] 2. When adjusting the backrest angle, different tilt angles can be quickly locked through the angle adjustment unit (locking disc, handle, snap-fit ​​groove); at the same time, the backrest rotation is linked to drive the foot pedal bracket and armrest to move synchronously through the parallelogram linkage mechanism (foot pedal long support rod, short support rod, armrest rod, etc.), without the need to adjust the foot pedal and armrest positions separately, realizing "one-backrest linkage", and the operation is intuitive and convenient.

[0019] 3. An arc-shaped frame is used as the swing base, and a double guide and limiting structure of positioning groove and positioning teeth, and limiting pin and arc-shaped groove is used to ensure that the arc-shaped frame only swings back and forth on the base structure, without horizontal deviation, and the swinging process is stable and safe.

[0020] 4. The backrest angle adjustment track is divided into two sections: the first half, where the horizontal support shaft is located within the fixed support groove, and the rear section of the seat is rigidly supported by a movable support rod, is suitable for upright office work; the second half, where the horizontal support shaft disengages from the fixed support groove, and the rear section of the seat is elastically supported by a spring support unit (spring), forming a "reclining" posture. The spring can buffer weight differences and provide flexible support, significantly improving the comfort of the reclining posture. Furthermore, the fixed support groove has an inner fixed support section and an outer guide section. When returning to a sitting posture from a reclining position, the guide section can guide the horizontal support shaft to smoothly slide back to the fixed support section, avoiding jamming or misalignment due to different spring compression, ensuring reliability and service life during repeated switching.

[0021] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment provided by the present invention; Figure 2 This is a schematic diagram of the usage state of an embodiment provided by the present invention. Figure 1 (Remove the panel of the frame structure); Figure 3 This is a schematic diagram of the usage state of an embodiment provided by the present invention. Figure 2 ; Figure 4 This is a partial structural schematic diagram of the arc-shaped frame provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the frame structure (excluding the base frame) provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of the frame structure provided in an embodiment of the present invention (excluding the complete frame portion). Figure 7 This is a schematic diagram of the angle adjustment unit provided in an embodiment of the present invention; Figure 8 This is a schematic diagram showing the connection between the locking disc, the backrest, and the movable bracket according to an embodiment of the present invention. In the diagram, 1. Seat frame structure; 1-1. Positioning teeth; 1-2. Arc-shaped groove; 1-3. Base frame; 1-4. Central column; 1-5. Seat frame; 1-6. Outer tube of central column; 2. Roller structure; 3. Arc-shaped frame; 3-1. Front support; 3-2. Fixed support groove; 3-3. Arc-shaped rod; 3-4. Crossbar; 3-5. Arc-shaped plate; 3-6. Positioning connecting plate; 3-7. Positioning rod; 3-8. Limiting pin; 4. Power unit; 4-1. Motor; 4-2. Crank; 4-3. Drive 4-4. Shaft; 4-5. Drive arm; 4-6. Battery; 5. Seat plate; 6. Backrest; 7. Angle adjustment unit; 7-1. Locking disc; 7-2. Torsion spring; 7-3. Handle; 7-4. Return spring; 7-5. Snap-fit ​​groove; 7-6. Snap-fit ​​connector; 8. Spring support unit; 9. Movable support rod; 10. Horizontal support shaft; 11. Armrest and foot pedal assembly; 11-1. Armrest bar; 11-2. Short foot pedal support rod; 11-3. Long foot pedal support rod; 11-4. Foot pedal bracket; 11-5. Foot pedal. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-8 The principles and features of the present invention are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0025] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Reference Figures 1-8 As shown, the present invention provides a multifunctional office chair.

[0028] Example 1 include The seat frame structure 1 has a roller structure 2 at the bottom of the seat frame structure; The seat structure has an arc-shaped frame 3 at its bottom, and the seat structure is supported on the seat frame structure by rotating the arc-shaped frame. Power unit 4, the power unit is located on the seat frame structure and connected between the arc frame of the seat frame structure and the seat structure, and drives the seat structure to rotate on the seat frame structure; The seat structure also includes a seat plate 5, a backrest 6, an angle adjustment unit 7, and a spring support unit 8. The lower end of the backrest is rotatably connected to the rear side of the seat plate. The angle adjustment unit is connected between the seat plate and the backrest to adjust the included angle between them. The front end of the arc frame is fixedly provided with a front support 3-1, and the rear end is provided with a fixed support groove 3-2. The front end of the seat plate is rotatably connected to the front support. The bottom end of the backrest extends downward and is fixedly provided with a movable support rod 9. The end of the movable support rod is fixedly provided with a horizontal support shaft 10. The spring support unit is connected between the seat plate and the arc frame. The backrest angle adjustment trajectory is divided into two segments. One segment corresponds to the horizontal support shaft being located in the fixed support groove, and the rear section of the seat plate being supported on the arc frame by the movable support rod. The other segment corresponds to the horizontal support shaft being detached from the fixed support groove, and the rear section of the seat plate being supported on the arc frame by the spring support unit.

[0029] Example 2 Based on Embodiment 1, a preferred arc-shaped frame structure is provided. The arc-shaped frame includes arc-shaped rods 3-3, arc-shaped plates 3-5, and crossbars 3-4; multiple arc-shaped rods are arranged in parallel, multiple crossbars are arranged in parallel, and a single crossbar is simultaneously fixedly connected between the arc-shaped rods; the arc-shaped plate is connected between two adjacent crossbars; a movable support rod is fixed at one end of the arc-shaped rod, and a fixed support groove is provided at the other end of the arc-shaped rod; a power unit is connected between the arc-shaped plate and the base frame structure, and spring support units are fixedly connected at both ends between the arc-shaped plate and the base plate.

[0030] In the above structure, the arc-shaped rod serves as the contact surface between the arc-shaped frame and the base frame structure, ensuring that the arc-shaped frame reciprocates on the base frame structure; the seat structure is connected to the arc-shaped frame through the front support and the fixed support groove; the power unit drives the arc-shaped frame to swing on the seat frame structure through the arc plate.

[0031] Based on Embodiment 2, in order to ensure the stability of the swing of the arc frame, the arc frame further includes a positioning connecting plate 3-6 and a positioning rod 3-7; the positioning connecting plate includes an arc segment and a connecting segment; the arc segment and the arc rod are arranged in parallel at intervals, and multiple positioning rods are arranged at intervals between the arc segment and the arc rod, and a positioning groove is formed between adjacent positioning rods. The base frame structure is provided with positioning teeth 1-1 that match the positioning groove; the top end of the connecting segment is integrally formed with the arc segment, and a limiting pin 3-8 is fixedly provided at the bottom end of the connecting segment. The base frame structure is provided with an arc groove 1-2 that matches the limiting pin.

[0032] In the above structure, matching positioning grooves and positioning teeth, as well as matching arc grooves and limiting pins, are provided between the arc frame and the base frame structure to restrict relative movement between the arc frame and the base in the horizontal plane, so that the arc frame can only rotate on the base frame structure, thereby ensuring the stability and reliability of the arc frame swinging on the base frame structure.

[0033] As shown in the figure, the preferred arc-shaped frame includes two arc-shaped rods, two crossbars, and one arc-shaped plate. Each arc-shaped rod has a front support at its front end and a fixed support groove at its rear end. The two crossbars are fixedly connected between the two arc-shaped rods, one in front and one behind, and the arc-shaped plate is connected between the two crossbars.

[0034] Based on embodiment 1 or 2, the fixed support groove is provided with two sections, including an inner fixed support section and an outer guide section; as the backrest rotates, the horizontal support shaft at the end of the movable rod fixed on the backrest is placed at different points within the fixed support section.

[0035] In the above structure, as the backrest rotates on the seat, in the first half where the angle between the backrest and the seat gradually increases, the horizontal support shaft at the end of the movable rod fixed to the backrest remains in the fixed support section of the fixed support groove. At this time, the horizontal support shaft is locked in the fixed support groove, and the seat, backrest, and curved frame remain in a fixed connection state, with the user sitting on the seat in a "sitting upright" position. As the backrest continues to rotate on the seat, in the second half where the angle between the backrest and the seat gradually increases, the horizontal support shaft at the end of the movable rod fixed to the backrest disengages from the fixed support section of the fixed support groove and becomes suspended. At this time, the seat and the curved frame are connected by a spring support unit, and the user sitting on the seat is in a "reclining" position. Afterward, activating the power unit allows the user to experience rocking motions.

[0036] As the backrest rotates on the seat, in the first half where the angle between the backrest and the seat gradually decreases, the guide section on the outside of the fixed support groove guides the horizontal support shaft at the end of the movable rod fixed on the backrest. This prevents the horizontal support shaft at the end of the movable rod fixed on the backrest from failing to slide back into the fixed support section inside the fixed support groove due to differences in the user's weight and the resulting difference in the compression of the spring support unit.

[0037] Based on embodiment 1 or 2, the power unit includes a motor 4-1, a crank 4-2, a drive shaft 4-3, a drive arm 4-4, and a battery 4-5; the motor and battery are fixed on the frame structure and electrically connected; the output shaft of the motor is connected to one end of the crank, and the drive shaft is fixed on the other end of the crank; the top of the drive arm is fixed on an arc frame (such as the arc plate in the embodiment), and a vertical drive groove is provided on the drive arm, with the drive shaft placed in the drive groove.

[0038] In the above structure, the motor drives the crank to rotate, the crank drives the drive shaft to rotate, and the drive shaft slides in the drive groove of the drive arm, thereby driving the drive arm and the arc frame to reciprocate on the frame structure. To ensure the smoothness of the reciprocating swing of the arc frame driven by the motor, the motor is equipped with two collinear output shafts, and is also equipped with a crank, drive shaft and drive arm that are matched with the output shafts.

[0039] The power unit consists of a motor, crank, drive shaft and drive arm, which can be electrically driven to rock. It can also be equipped with batteries and switches to realize speed adjustment and timing, without manual intervention, and can meet different usage preferences.

[0040] Based on embodiment 1 or 2, the frame structure includes a base frame 1-3, a central column 1-4, and a frame 1-5. A roller structure is installed at the bottom of the base frame, and the bottom end of the central column is fixed to the base frame, with the central column arranged vertically. A central column outer tube 1-6 is provided on the frame, and the central column is placed inside the central column outer tube. A limiting part is provided between the two, and the central column can only rotate inside the central column outer tube.

[0041] As shown in the figure, the base frame is a box-type structure with an arc-shaped groove on the side wall of the base frame for matching the limit pin; the motor and battery are both fixed on the outer tube of the central column.

[0042] Based on embodiment 1 or 2, the seat structure further includes an armrest and footrest assembly 11; The handrail and foot pedal structure includes a handrail 11-1, a short foot pedal support 11-2, a long foot pedal support 11-3, a foot pedal bracket 11-4, and a foot pedal 11-5. The foot pedal bracket, handrail, and seat are arranged in parallel. The two ends of the short foot pedal support are rotatably connected to the foot pedal bracket and the seat, respectively. The bottom of the long foot pedal support is rotatably connected to the foot pedal bracket, the middle part is rotatably connected to the seat, and the top is rotatably connected to the handrail. The long foot pedal support is divided into an upper section and a lower section, with the point of rotation on the seat as the boundary. The upper section of the long foot pedal support, seat plate, backrest, and armrest form a parallelogram structure; the lower section of the long foot pedal support, seat plate, short foot pedal support, and foot pedal bracket form a parallelogram structure; the foot pedal is rotatably connected to the foot pedal bracket, and a pin and multiple sets of pin holes are provided between the two for adjusting the angle between the foot pedal and the foot pedal bracket. Other existing non-manual methods can also be used to adjust the angle between the foot pedal and the foot pedal bracket, which is prior art and will not be described in detail here.

[0043] In the above structure, after the angle between the backrest and the seat is adjusted by the angle adjustment unit, the angle between the long foot pedal support rod and the seat also changes because the upper section of the long foot pedal support rod, the seat, the backrest, and the armrest form a parallelogram structure. The relative position between the foot pedal support and the seat also changes because the lower section of the long foot pedal support rod, the seat, the short foot pedal support rod, and the foot pedal bracket form a parallelogram structure, thus achieving coordinated adjustment of the foot pedal and the backrest.

[0044] Based on embodiment 1 or 2, the angle adjustment unit includes a locking disc 7-1, a torsion spring 7-2, a handle 7-3, and a return spring 7-4; the locking disc is fixed to the backrest base, a first rotating shaft is provided on the seat plate, and the locking disc has a rotating shaft hole that matches the first rotating shaft. The backrest is rotatably connected to the seat plate through the locking disc; the torsion spring is connected between the locking disc and the first rotating shaft, the handle is rotatably connected to the seat plate, and the return spring is connected between the handle and the seat plate; the locking disc has multiple locking slots 7-5 (only two locking slots are shown in the figure), and different locking slots correspond to different included angles between the backrest and the seat plate; a second rotating shaft is fixed on the seat plate, the middle part of the handle is rotatably connected to the seat plate through the second rotating shaft, and the non-grip end of the handle has a locking connector 7-6 that matches the locking slot.

[0045] As shown in the figure, the user overcomes the elastic force of the return spring by using the handle to snap the snap connector at the end of the handle into different snap slots, thereby adjusting the angle between the seat and the backrest.

[0046] Based on embodiment 1 or 2, the roller structure includes several universal wheels with braking function; the spring support unit is a spring.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A multifunctional office chair, characterized by: include The seat frame structure has a roller structure at its bottom; The seat structure has an arc-shaped frame at the bottom, and the seat structure is supported on the seat frame structure by rotating the arc-shaped frame; The power unit is located on the seat frame structure and connected between the seat frame structure and the arc-shaped frame of the seat structure, driving the seat structure to rotate on the seat frame structure. The seat structure includes a seat plate, a backrest, an angle adjustment unit, and a spring support unit. The lower end of the backrest is rotatably connected to the rear side of the seat plate. The angle adjustment unit is connected between the seat plate and the backrest to adjust the angle between them. The front end of the arc frame is fixedly provided with a front support, and the rear end is provided with a fixed support groove. The front end of the seat plate is rotatably connected to the front support. The bottom end of the backrest extends downward and is fixedly provided with a movable support rod. The end of the movable support rod is fixedly provided with a horizontal support shaft. The spring support unit is connected between the seat plate and the arc frame. The backrest angle adjustment trajectory is divided into two segments. One segment corresponds to the horizontal support shaft being located in the fixed support groove, and the rear section of the seat plate being supported on the arc frame by the movable support rod. The other segment corresponds to the horizontal support shaft being detached from the fixed support groove, and the rear section of the seat plate being supported on the arc frame by the spring support unit.

2. The multifunctional office chair according to claim 1, characterized in that: The arc-shaped frame includes arc-shaped rods, arc-shaped plates, and crossbars; multiple arc-shaped rods are arranged in parallel, multiple crossbars are arranged in parallel, and a single crossbar is simultaneously fixedly connected between the arc-shaped rods; the arc-shaped plate is connected between two adjacent crossbars; a movable support rod is fixed at one end of the arc-shaped rod, and a fixed support groove is provided at the other end of the arc-shaped rod; a power unit is connected between the arc-shaped plate and the seat frame structure, and spring support units are fixedly connected at both ends between the arc-shaped plate and the seat plate.

3. The multifunctional office chair according to claim 2, characterized in that: The arc-shaped frame also includes a positioning connecting plate and positioning rods; the positioning connecting plate includes an arc-shaped segment and a connecting segment; the arc-shaped segment and the arc-shaped rods are arranged in parallel at intervals, and multiple positioning rods are arranged at intervals between the arc-shaped segment and the arc-shaped rods, with positioning grooves formed between adjacent positioning rods, and positioning teeth that match the positioning grooves are provided on the frame structure; the top end of the connecting segment is integrally formed with the arc-shaped segment, and a limiting pin is fixedly provided at the bottom end of the connecting segment, and an arc-shaped groove that matches the limiting pin is provided on the frame structure.

4. The multifunctional office chair according to claim 3, characterized in that: The curved frame consists of two curved rods, two crossbars, and one curved plate.

5. The multifunctional office chair according to claim 1, characterized in that: The fixed support groove has two sections, including an inner fixed support section and an outer guide section; as the backrest rotates, the horizontal support shaft at the end of the movable rod fixed on the backrest is positioned at different points within the fixed support section.

6. The multifunctional office chair according to claim 1, characterized in that: The power unit includes a battery, a motor, a crank, a drive shaft, and a drive arm; the motor and battery are fixed on the frame structure and electrically connected; the output shaft of the motor is connected to one end of the crank, and the drive shaft is fixed at the other end of the crank; the top of the drive arm is fixed on an arc-shaped frame, and a vertical drive groove is provided on the drive arm, with the drive shaft placed in the drive groove.

7. The multifunctional office chair according to claim 1, characterized in that: The frame structure includes a base frame, a central column, and a seat frame. A roller structure is installed at the bottom of the base frame, and the bottom end of the central column is fixed to the base frame, with the central column arranged vertically. A central column outer tube is installed on the seat frame, and the central column is placed inside the central column outer tube. A limiting part is provided between the two, and the central column can only rotate inside the central column outer tube.

8. The multifunctional office chair according to claim 1, characterized in that: The seat structure also includes armrest and footrest components; The handrail and foot pedal structure includes a handrail, a short foot pedal support, a long foot pedal support, a foot pedal bracket, and a foot pedal. The foot pedal bracket, handrail, and seat are arranged in parallel. The two ends of the short foot pedal support are rotatably connected to the foot pedal bracket and the seat, respectively. The bottom of the long foot pedal support is rotatably connected to the foot pedal bracket, the middle part is rotatably connected to the seat, and the top is rotatably connected to the handrail. The long foot pedal support is divided into an upper section and a lower section, with the point of rotation on the seat as the boundary. The upper section of the long foot pedal support, seat plate, backrest, and armrest form a parallelogram structure; the lower section of the long foot pedal support, seat plate, short foot pedal support, and foot pedal bracket form a parallelogram structure; the foot pedal is rotatably connected to the foot pedal bracket, and there is a pin and multiple sets of pin holes between the two for adjusting the angle between the foot pedal and the foot pedal bracket.

9. The multifunctional office chair according to claim 1, characterized in that: The angle adjustment unit includes a locking disc, a torsion spring, a handle, and a return spring. The locking disc is fixed to the backrest base, and a first rotating shaft is provided on the seat plate. The locking disc has a rotating shaft hole that matches the first rotating shaft. The backrest is rotatably connected to the seat plate through the locking disc. The torsion spring is connected between the locking disc and the first rotating shaft. The handle is rotatably connected to the seat plate, and the return spring is connected between the handle and the seat plate. The locking disc has multiple locking slots, and different locking slots correspond to different included angles between the backrest and the seat plate. A second rotating shaft is fixed on the seat plate, and the middle part of the handle is rotatably connected to the seat plate through the second rotating shaft. The non-grip end of the handle has a locking connector that matches the locking slot.

10. The multifunctional office chair according to claim 1, characterized in that: The roller structure includes several universal wheels with braking function; the spring support unit is a spring.

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