A seat and a method of seating support thereof

Abstract

The application discloses a seat and a sitting supporting method thereof, which comprises a back supporting body, a seat supporting body, a bottom supporting assembly and a side transmission device; the side transmission device comprises a transmission supporting piece and a rotating gear piece; the rotating gear piece comprises a rotating column and a first rotating gear and a second rotating gear; a back gear is connected to a back connecting piece of the back supporting body and is rotationally matched with an upper end of the transmission supporting piece; a bottom fixed gear is fixedly connected to a support of the bottom supporting assembly and is rotationally matched with a bottom end of the transmission supporting piece; a seat connecting piece of the seat supporting body is rotationally connected to the transmission supporting piece; when the back supporting body moves from an initial position to a backward-tilting rotating position, the back gear rotates the first rotating gear to rotate the rotating gear piece, and the second rotating gear simultaneously rotates relative to the bottom fixed gear to rotate the transmission supporting piece forward around the bottom fixed gear to drive the seat supporting body to move forward simultaneously.

Description

Technical Field

[0001] This invention relates to the field of seating, and more particularly to a chair and a method for supporting seating thereon. Background Technology

[0002] Chairs are an indispensable tool in both home and office environments. Comfort requirements are increasingly high not only at home but also in the office, where efficiency demands are driven by improved comfort and ease of use. Currently, the design of most chairs with traditional chassis structures limits the movement of the seat when the user leans back; the backrest and seat movements are independent. This causes a change in the distance between the backrest and seat when leaning back, resulting in relative displacement and friction between the backrest and the user's back when the seat position remains unchanged. This leads to discomfort and what is commonly referred to as "back rubbing" or "lumbar back pain."

[0003] To address the aforementioned issues, manufacturers have introduced chairs with ergonomically linked backrests; these chairs are collectively referred to as seat-back linkage chairs. Currently, in most seat-back linkage chairs, the linkage between the backrest and the seat is achieved through the chassis structure beneath the seat.

[0004] For example, Chinese utility model patent CN202220338236.6 discloses "an office chair with a backrest that reclines and a seat that slides in tandem," comprising: a support structure including an assembly frame with a fixed sliding sleeve having a guide hole extending at an angle relative to the horizontal plane; a seat including a movable seat with a sliding pin slidably disposed within the guide hole along its extension direction; a backrest including a main frame and a hinge ear disposed on the main frame, the main frame being rotatably disposed on the assembly frame along its height direction at its bottom, and the hinge ear being rotatably disposed on the movable seat; and a locking pin assembly disposed on the assembly frame for locking the sliding pin in the guide hole. This utility model enables the backrest to recline and the seat to slide in tandem, and can lock the user in a reclining posture that best meets their comfort requirements, greatly improving the comfort of the office chair.

[0005] The aforementioned method of achieving seat-back linkage through chassis structure is very common in current office chair designs; however, the corresponding chassis connections and structures are undoubtedly complex and cumbersome, leading to the biggest problem being the high processing and manufacturing costs of the chassis. The cost of a chassis mold and the cost of manufacturing the chassis are very expensive, indirectly resulting in a higher price for the chair.

[0006] Therefore, there is a need to design a seat with a simplified structure and lower cost that links the seat and backrest. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a seat and a method for supporting sitting there. By using a side transmission device on both sides of the seat and the transmission between gears, the seat support can move forward synchronously while the back support body is tilted back, thus realizing the linkage between the seat and the back. Therefore, there is no need to equip the traditional seat chassis structure. The structure is simple, reliable, and ingeniously designed, which can greatly reduce the cost of the seat.

[0008] The technical solution of this invention is implemented as follows: A seat includes: a back support body and a seat support body, wherein the back support body has forward-extending back connectors on both sides; the seat support body has upward-extending seat connectors on both sides at the rear end; a bottom support assembly includes a base for connecting to a gas spring and a bracket extending forward from the base; the front end of the seat support body is movably connected to the bracket. A side transmission device is connected between the back connector and the bracket. The side transmission device includes a longitudinal transmission support and a rotating gear arranged within the transmission support along its length. The rotating gear includes a rotating column and a first rotating tooth and a second rotating tooth located at both ends of the rotating column. The rotating column is configured to rotate circumferentially in place within the transmission support so that the first rotating tooth and the second rotating tooth rotate synchronously. A back moving tooth is fixedly connected to the end of the back connector and rotatably fitted to the upper end of the transmission support. The back moving tooth meshes with the first rotating tooth, and their axial directions are perpendicular. A bottom fixed tooth is fixedly connected to the bracket and rotatably fitted to the bottom end of the transmission support. The bottom fixed tooth meshes with the second rotating tooth, and their axial directions are perpendicular. The seat connector is rotatably connected to the transmission support. When the back support moves from the initial position to the backward rotation position, the back moving tooth rotates the first rotating tooth, causing the rotating gear to rotate. Simultaneously, the second rotating tooth rotates relative to the bottom fixed tooth, causing the transmission support to rotate forward around the bottom fixed tooth, thereby driving the seat support to move forward simultaneously.

[0009] Preferably, the transmission support member has at least two spaced rotating seats, and the rotating column is rotatably fitted within the rotating seats. This ensures that the rotating gear can rotate stably in the circumferential direction within the transmission support member without wobbling; and that the first and second rotating teeth at both ends rotate simultaneously.

[0010] Preferably, both the first and second rotating teeth are provided with a limiting mechanism between themselves and the transmission support member. The limiting mechanism includes a limiting sleeve extending towards the center of the rotating column on the first or second rotating tooth, and a corresponding limiting plate disposed within the transmission support member. Along the length of the transmission support member, the limiting sleeve abuts against the limiting plate. This restricts the displacement between the rotating tooth and the transmission limiting member, ensuring that the rotating tooth can only rotate within the transmission support member, and that the first and second rotating teeth can only rotate in place relative to the transmission support member.

[0011] Preferably, the gear ratio between the first rotating tooth and the back-moving tooth is 1:1; the gear ratio between the second rotating tooth and the bottom fixed tooth is 1:2. Since the back support body has a large backward tilt angle, the gear ratio between the second rotating tooth and the bottom fixed tooth is set to 1:2, so that the transmission support can rotate within a reasonable angle to drive the seat support body to move forward.

[0012] Preferably, a balancing guide mechanism is provided between the front end of the bracket and the seat support. This balancing guide mechanism includes two upper and lower spaced rolling horizontal shafts at the front end of the bracket, and a balancing guide plate extending rearward from the front end of the seat support. The balancing guide plate is clamped between the two rolling horizontal shafts and is configured to be tangent to either rolling horizontal shaft. The rolling horizontal shafts can roll in place relative to the bracket. This ensures that when the seat support moves back and forth, the balancing guide plate moves stably between the two rolling horizontal shafts, resulting in smooth and stable movement of the seat support. Furthermore, the angular angle of the balancing guide plate clamped between the two rolling horizontal shafts can change.

[0013] Preferably, in the initial position, the seat support is in a front-high, rear-low configuration; and from front to back, the balance guide plate tilts downwards and backwards; and the angle between the balance guide plate and the seat support is an acute angle. This allows the back support to rotate backwards, simultaneously lifting the rear end of the seat support and moving it forward. The rear end of the balance guide plate will also tilt upwards and move forward simultaneously, causing the balance guide plate to change angle between the two rolling axes, resulting in its front end moving downwards. This causes the front end of the seat support to sink a certain distance to counteract the upward movement of the seat support during this process. Ultimately, the front end of the seat support moves forward, but its height remains almost constant, preventing pressure on the user's thighs.

[0014] Preferably, in the initial position, the line connecting the centers of the two rolling horizontal axes is perpendicular to the length direction of the balance guide plate. This makes it easier for the balance guide plate to rotate between the two rolling horizontal axes in the initial position, ensuring smooth rotation of the balance guide plate.

[0015] Preferably, the transmission support is a shell structure with an opening facing outwards, and the rotating gear is located inside the transmission support; a side cover is detachably connected to the transmission support. This allows the internal connection structure of the transmission connector to be hidden after assembly, resulting in a very simple and aesthetically pleasing overall seat structure.

[0016] Preferably, the transmission support is configured to connect to the armrest. Located on the side of the seat, the transmission support further connects to and supports the armrest, allowing the armrest to move synchronously with the seat back, resulting in a more ingenious design.

[0017] Preferably, the seat connector extends forward and upward from back to front, and its upper end is rotatably connected to the upper part of the transmission support. This ensures that the direction of the force applied to the seat connector when the transmission support rotates forward coincides with the length direction of the seat connector, resulting in better force transmission and more effectively pulling the seat connector.

[0018] Preferably, the bracket includes a support plate, which is made of steel, extending forward and upward from the base. This ensures the structural support.

[0019] Preferably, the transmission support member has shaft holes at its upper and lower ends, and the back moving tooth and the bottom fixed tooth are each provided with a rotating shaft that rotatably engages with the shaft hole; the rotating shaft passes through the shaft hole.

[0020] Preferably, the back moving tooth and the back connecting member, and the bottom fixed tooth and the bracket are fixed by snap-fit ​​connection; polygonal locking blocks are provided on the back connecting member and the bracket respectively, and corresponding locking grooves are provided on the back moving tooth and the bottom fixed tooth respectively. The snap-fit ​​connection makes the connection more stable; the back moving tooth and the back connecting member, and the bottom fixed tooth and the bracket can always maintain circumferential fixation.

[0021] Preferably, the bracket has upwardly extending arms on both sides, and the bottom fixed teeth are connected to the arms.

[0022] The seating support method for the aforementioned seat is as follows: In the initial position, the seat support is in a front-high, back-low state, and the back support is nearly upright; the user sits on the seat and applies a back thrust to the back support to cause it to tilt backward. The back connector moves with the back support and drives the gear between the back moving tooth and the first rotating tooth to rotate, causing the rotating tooth to rotate within the transmission support; correspondingly, the second rotating tooth rotates relative to the bottom fixed tooth, and the rotating tooth, in conjunction with the transmission support, rotates forward around the bottom fixed tooth to drive the rear end of the seat support to move upward and forward to the tilted-back position; in this tilted-back position, the seat support is nearly horizontal; the back connector rotates downward around the upper end of the transmission support, causing the bottom end of the back support to move downward and forward.

[0023] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows: Firstly, the seat of this invention utilizes a side transmission device to achieve a linkage effect between the back support and the seat support. Through gear transmission between the back moving gear, the first rotating gear, the second rotating gear, and the bottom fixed gear, the seat support is simultaneously driven to move forward and upward when the back support tilts back and rotates; and the bottom end of the back support moves downward and forward. This ensures that the seat always provides support for the human lower back, effectively preventing "back slippage" and rubbing between the human back and the chair back. It comprehensively solves the problems of back slippage and rubbing when the back of the seat tilts back in existing technologies, which is beneficial to human health and improves the comfort of the seat. Furthermore, the side transmission device is located on both sides of the seat, thus eliminating the need for the chassis structure of traditional seat-back linkage chairs to achieve linkage between the seat and back, resulting in a simplified and reliable structure that significantly reduces costs.

[0024] Furthermore, although the side transmission device is mirrored on both sides of the seat, the gear transmission is highly precise, resulting in high synchronicity of the rotation of the transmission support components on both sides of the seat. This ensures that the back support and seat support move synchronously on both sides, making the seat tilt movement very stable.

[0025] Furthermore, a balance guide mechanism is provided at the front end of the seat connector and the front end of the bracket. This balance guide mechanism includes two vertically spaced rolling horizontal shafts at the front end of the bracket and a balance guide plate at the front end of the seat support extending downward and backward. The balance guide plate is clamped between the two rolling horizontal shafts and can change angle. When the rear end of the seat support is lifted upward and moves forward, the rear end of the balance guide plate will tilt upward and move forward simultaneously. This causes the balance guide plate to rotate between the two rolling horizontal shafts, and the front end of the balance guide plate will move downward so that the front end of the seat support will sink a certain distance to counteract the upward movement of the seat support during this movement. As a result, the front end of the seat support moves forward, but its front end height remains almost unchanged. This prevents the front end of the seat support from pressing against the user's thighs when the user leans back. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the seat in the initial state of the back support body in an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the seat when the back support is tilted back in an embodiment of the present invention. Figure 3 This is a three-dimensional structural diagram of the seat side in an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the front part of the seat in an embodiment of the present invention; Figure 5 This is a schematic diagram of the connection between the back support, seat support, bottom support assembly and side transmission device in an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the rotating gear meshing with the transmission support in an embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram of the front end of the bracket in an embodiment of the present invention; Figure 8 This is a three-dimensional structural diagram of the back-moving tooth, transmission support member, and back connecting member cooperating in an embodiment of the present invention; Figure 9 This is a schematic diagram of the motion trajectory of the transmission support member during rotation in an embodiment of the present invention; Figure 10 This is a three-dimensional structural diagram of the transmission support member connected to the side cover in an embodiment of the present invention; Figure 11 This is a schematic diagram showing the height comparison of the front end of the seat support body as it moves from its initial state to its tilted-back state in an embodiment of the present invention.

[0027] The reference numerals in the attached figures are as follows: back support 1; back connector 101; seat support 2; seat connector 201; bottom support assembly 3; base 3a; bracket 3b; side transmission device 4; support arm 5; transmission support 6; side cover 601; rotating gear 7; rotating column 701; first rotating gear 8; second rotating gear 9; rotating seat 10; limiting sleeve 11; limiting clamping plate 12; back moving gear 13; rotating shaft column 14; shaft hole 15; snap-fit ​​groove 16; clamping block 17; bottom fixed gear 18; rolling horizontal shaft 19; balance guide plate 20; support plate 21. Detailed Implementation

[0028] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0030] In the description of this invention, the term "at least one" means one or more, unless otherwise expressly defined. The terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] The specific embodiments of the present invention are as follows: like Figure 1 , 2As shown, the present invention provides a seat, comprising a back support 1, a seat support 2, a bottom support assembly 3, and a side transmission device 4. The back support 1 has forward-extending back connectors 101 on both sides, and the seat support 2 has upward-extending seat connectors 20101 on both sides of its rear end. The bottom support assembly 3 includes a base 3a for connecting to a gas spring and a bracket 3b extending forward from the base 3a. Upward-extending support arms 5 are provided on both sides of the bracket 3b. The side transmission device 4 is mirror-mounted on both sides of the seat, with each end of the side transmission device 4 connected to the back connector 101 and the support arm 5, respectively. The upper end of the seat connector 20101 is rotatably connected to the side transmission device 4. The side transmission device 4 enables the back support 1 and the seat support 2 to move in tandem.

[0032] Specifically: such as Figure 1-9 As shown, the side transmission device 4 includes a longitudinally arranged transmission support member 6 and a rotating gear member 7 disposed within the transmission support member 6. The rotating gear member 7 includes a rotating column 701 arranged along the length direction of the transmission support member 6 and a first rotating tooth 8 and a second rotating tooth 9 respectively disposed at both ends of the rotating column 701. The axial directions of the first rotating tooth 8 and the second rotating tooth 9 coincide with the length direction of the rotating column 701. The rotating column 701 is rotatably fitted within the transmission support member 6. Specifically: Figure 6 As shown, two spaced rotating seats 10 are provided inside the transmission support member 6, and the rotating seats 10 are detachably connected to the transmission support member 6. The rotating column 701 is rotatably engaged in the two rotating seats 10, so that the rotating gear 7 can rotate stably within the transmission support member 6 without shaking. This allows the first rotating tooth 8 and the second rotating tooth 9 at both ends to rotate simultaneously. Furthermore, the first rotating tooth 8 and the second rotating tooth 9 are respectively provided with limiting mechanisms between themselves and the transmission support member 6. The limiting mechanisms include limiting sleeves 11 extending towards the center of the rotating column 701 on the first rotating tooth 8 or the second rotating tooth 9, and corresponding limiting plates 12 on the transmission support member 6. Along the length of the transmission support member 6, the limiting sleeves 11 and the limiting plates 12 abut against each other. This ensures that the rotating gear 7 can only rotate in place within the transmission support member 6 and cannot be displaced relative to the transmission support member 6.

[0033] like Figure 3-9As shown, the back connector 101 has a back moving tooth 13 at its end, which is engaged and fixed with the back connector 101. The back moving tooth 13 is rotatably engaged with the upper end of the transmission support 6 and rotates with the first rotating tooth 8. Specifically, the back moving tooth 13 is detachably connected to the back connector 101, and the back moving tooth 13 has a protruding rotating shaft 14. The upper end of the transmission support 6 has a shaft hole 15. The back connector 101 has a protruding polygonal locking block 17 at its end, and the rotating shaft 14 has a corresponding locking groove 16. During assembly, the rotating shaft 14 of the back moving tooth 13 is rotated through the shaft hole 15, and then the locking block 17 on the back connector 101 is engaged in the locking groove 16. This allows the back moving tooth 13 to rotate relative to the transmission support 6, and the back moving tooth 13 and the back connector 101 remain relatively fixed. A bottom fixed tooth 18 is provided on the support arm 5 of the bracket 3b. Similarly, the cooperation structure between the bottom fixed tooth 18 and the transmission support 6 and the support arm 5 is the same as the cooperation structure between the back moving tooth 13 and the transmission support 6, so that the bottom fixed tooth 18 rotates and engages with the bottom end of the transmission support 6 and is locked in place with the support arm 5. By using the locking method, the back moving tooth 13 and the back connecting member 101, and the bottom fixed tooth 18 and the support arm 5 can always maintain circumferential fixation.

[0034] The assembly sequence between the structures is as follows: first, the back-moving tooth 13 and the bottom fixed tooth 18 are rotatably connected to the transmission support 6, and then the rotating tooth 7 is rotatably assembled into the transmission support 6. This ensures that the back-moving tooth 13 will engage with the first rotating tooth 8 in a rotating gear direction, i.e., the axial direction of the back-moving tooth 13 is perpendicular to the axial direction of the first rotating tooth 8. The bottom fixed tooth 18 will engage with the second rotating tooth 9 in a rotating gear direction, i.e., the axial direction of the bottom fixed tooth 18 is perpendicular to the axial direction of the second rotating tooth 9. This achieves the linkage between the back-moving tooth 13, the rotating tooth 7, and the bottom fixed tooth 18.

[0035] like Figure 1 , 2 As shown in 9 and 11, the specific seating support method of this chair is as follows: Figure 1 As shown, in the initial position, the seat support 2 is in a state of being higher in the front and lower in the back; the back support 1 is nearly upright. When the user sits on the seat and applies a back thrust to the back support 1, causing it to tilt backward and rotate, the back support 1 will drive the back connector 101 to drive the back moving gear 13 to rotate. The back moving gear 13 and the first rotating gear 8 rotate, causing the rotating gear 7 to rotate within the transmission support 6; thus, the second rotating gear 9 will simultaneously rotate relative to the bottom fixed gear 18. The bottom fixed gear 18 is connected and fixed to the bracket 3b, which is connected and fixed to the gas spring, meaning the bottom fixed gear 18 remains fixed, allowing it to provide support for the rotating gear 7; thus... Figure 2 ,9 As shown, while the second rotating tooth 9 rotates relative to the bottom fixed tooth 18, the rotating tooth 7 will rotate forward in a circle around the center of the bottom fixed tooth 18. The rotating tooth 7 can only rotate in place within the transmission support 6, therefore the transmission support 6 will rotate synchronously with the rotating tooth 7. Thus, when the back support 1 rotates backward relative to the bracket 3b, the transmission support 6 will simultaneously rotate forward relative to the bracket 3b. The upper end of the seat connector 201 is rotatably connected to the upper part of the transmission support 6. Therefore, when the transmission support 6 rotates forward, it will cause the seat connector 201 to simultaneously move the rear end of the seat support 2 upward and forward to the backward tilting position. Furthermore, from back to front, the seat connector 201 extends forward and upward, so that the force applied to the seat connector 201 when the transmission support 6 rotates forward coincides with the length direction of the seat connector 201, resulting in better force transmission and more effectively pulling the seat support 2 forward. Figure 2 As shown, in the backward rotation position, the seat support 2 is close to a horizontal state; while the back connector 101 always rotates downward relative to the upper end of the transmission support 6, so that the bottom end of the back support 1 will move downward and forward, thereby effectively preventing the user's waist from losing support and avoiding the phenomenon of back rubbing between the human back and the chair back.

[0036] Furthermore, in the initial position, the seat support 2 is in a state of being higher in the front and lower in the back. When the user's back applies a backward tilting force to the back support 1, this backward tilting force is transmitted through the side transmission device 4 to exert an upward force on the rear end of the seat support 2. This force will counteract the downward gravity exerted by the user on the rear end of the seat support 2, and the two are directly proportional. This allows people of lighter or heavier weight to easily tilt back and stand up again, giving the seat a gravity adaptive function.

[0037] In addition, such as Figure 10 As shown, the transmission support 6 is a shell structure with its opening facing outwards, and the rotating gear 7 is located inside the transmission support 6. A side cover 601 is detachably connected to the transmission support 6, thereby concealing the internal connection structure of the transmission support 6 and making the overall structure of the seat very simple and aesthetically pleasing. Furthermore, armrests (not shown) can also be installed on the transmission support 6. Since the transmission support 6 is located on the side of the seat, installing armrests on it is easy to achieve; thus, the armrests can also move synchronously with the seat back, making the design more ingenious; thus, the seat of this invention does not require the chassis structure of a traditional seat, which can greatly reduce costs.

[0038] like Figure 1-4As shown in Figure 7, a balancing guide mechanism is further provided between the front end of the seat support 2 and the front end of the bracket 3b. This balancing guide mechanism includes two vertically spaced rolling horizontal shafts 19 positioned at the front end of the bracket 3b, and a balancing guide plate 20 positioned at the front end of the seat support 2 and extending downwards and backwards. The balancing guide plate 20 is clamped between the two rolling horizontal shafts 19, and is configured to be tangent to either rolling horizontal shaft 19, allowing the rolling horizontal shafts 19 to roll relative to the bracket 3b in place. This ensures that when the seat support 2 moves back and forth, the balancing guide plate 20 will move stably between the two rolling horizontal shafts 19, resulting in smooth and stable movement of the seat support 2. Furthermore, the bracket 3b includes a support plate 21 extending forwards and upwards from the base 3a. This support plate 21 is made of steel, ensuring structural support.

[0039] Specifically, such as Figure 1-2 As shown in Figure 11, the seat connector 201 is located at the rear end of the seat support 2. When the back support 1 rotates rearward, causing the transmission support 6 to rotate forward, the rear end of the seat support 2 mainly moves upward and forward, applying an upward and forward force to the rear end of the seat support 2. Furthermore, the balance guide plate 20, clamped between the two rolling horizontal shafts 19, is capable of angular change; and from front to back, the balance guide plate 20 tilts downward and backward; as... Figure 11 As shown, in the initial position, the line connecting the centers of the two rolling horizontal axes 19 is perpendicular to the length direction of the balance guide plate 20; this makes it easier for the balance guide plate 20 to rotate between the two rolling horizontal axes 19 in the initial position. Then, when the rear end of the seat support 2 is lifted upwards and moves forward, the rear end of the balance guide plate 20 will tilt upwards and move forward simultaneously; causing the balance guide plate 20 to rotate accordingly between the two rolling horizontal axes 19. Simultaneously, the front end of the balance guide plate 20 will move downwards, causing the front end of the seat support 2 to sink a certain distance to offset the upward movement of the seat support 2 during this movement; thus, the front end of the seat support 2 ultimately moves forward, but its height remains almost unchanged; even if it is raised, the raised portion is negligible and almost imperceptible to the user, ensuring that the front end of the seat support 2 does not press against the user's thighs during the backward leaning process, resulting in comfortable use. Furthermore, the angle between the balance guide plate 20 and the seat support 2 is an acute angle, which means that the rotation of the balance guide plate 20 has little impact on the overall angle of the seat support 2, and only serves to prevent the front end of the seat support 2 from being lifted.

[0040] In this invention, the gear transmission ratio between the first rotating tooth 8 and the back-moving tooth 13 is 1:1; the gear transmission ratio between the second rotating tooth 9 and the bottom fixed tooth 18 is 1:2. This is because during the backward tilting process of the back support 1, the change in the backward tilting angle of the back support 1 is definitely greater than the change in the angle of the seat support 2; therefore, the gear ratio between the second rotating tooth 9 and the bottom fixed tooth 18 is set to 1:2, so that the transmission support 6 can rotate within a reasonable angle to drive the seat support 2 to move forward, making the angle change of the seat support 2 within the user's acceptable range. Furthermore, the linkage between the back support 1 and the seat support 2 is achieved by using gear transmission; although the side transmission device 4 is mirrored on both sides of the seat, the gear transmission precision is very high, thereby making the rotation synchronization of the transmission support 6 on both sides high, so that the back support 1 and the seat support 2 can maintain synchronous movement, making the seat tilting movement very stable.

[0041] Subsequently, the seat of the present invention utilizes a side transmission device 4 to achieve a linkage effect between the back support 1 and the seat support 2. The side transmission device 4 is located on both sides of the seat, thus eliminating the need for a traditional seat chassis structure to achieve linkage between the seat and back, resulting in a simplified and reliable structure that significantly reduces costs. This allows the seat support 2 to move forward synchronously as the user leans back and rotates the back support 1 backward. This ensures the seat consistently supports the lower back, effectively preventing back strain and promoting health. Furthermore, this design, with synchronized movement between the seat and backrest, ensures the backrest remains firmly against the user's back during reclining, guaranteeing comfort. In addition, the linkage design allows the seat support 2 to move forward while the back support 1 leans back, providing forward movement to the user and mitigating the instability caused by backward tilting. Moreover, the slight lifting of the front end of the seat support 2 during forward movement is negligible and does not compress the user's thighs.

Claims

1. A type of seat, characterized in that... include: The back support and the seat support are provided with forward-extending back connectors on both sides of the back support; and the seat support is provided with upward-extending seat connectors on both sides of the rear end. The bottom support assembly includes a base for connection with the gas spring and a bracket extending forward from the base; the front end of the base support is movably connected to the bracket. A side transmission device is connected between the back connector and the bracket; the side transmission device includes a longitudinal transmission support and a rotating gear disposed within the transmission support along the length direction of the transmission support; the rotating gear includes a rotating column and a first rotating tooth and a second rotating tooth located at both ends of the rotating column; the rotating column is configured to be able to rotate circumferentially in place within the transmission support so that the first rotating tooth and the second rotating tooth rotate synchronously. The back-moving tooth is fixedly connected to the end of the back connector and rotatably fitted on the upper end of the transmission support. The back-moving tooth is meshed with the first rotating tooth and the axial directions of the two are perpendicular. The bottom fixed tooth is fixedly connected to the bracket and rotatably engaged with the bottom end of the transmission support. The bottom fixed tooth and the second rotating tooth are meshed and their axial directions are perpendicular. The transmission support member has shaft holes at its upper and lower ends, and the back moving tooth and the bottom fixed tooth are each provided with a rotating shaft that rotatably engages with the shaft hole; the rotating shaft passes through the shaft hole. The seat connector is rotatably connected to the transmission support; when the back support moves from the initial position to the backward rotation position, the back moving tooth acts on the first rotating tooth to rotate the rotating tooth, and the second rotating tooth rotates relative to the bottom fixed tooth gear, so that the transmission support rotates forward around the bottom fixed tooth to drive the seat support to move forward at the same time. A balance guide mechanism is also provided between the front end of the bracket and the seat support body; the balance guide mechanism includes two upper and lower spaced rolling horizontal shafts set at the front end of the bracket, and a balance guide plate set at the front end of the seat support body and extending backward; the balance guide plate is clamped between the two rolling horizontal shafts and can change angle, and the balance guide plate is configured to be tangent to either rolling horizontal shaft; the rolling horizontal shafts can roll in place relative to the bracket; in the initial position, the seat support body is in a front-high and rear-low state; in the rearward rotation position, the seat support body approaches a horizontal state.

2. The seat according to claim 1, characterized in that: The transmission support component has at least two spaced rotating seats, and the rotating column is rotatably fitted within the rotating seats.

3. The seat according to claim 1, characterized in that: Both the first and second rotating teeth are provided with a limiting mechanism between themselves and the transmission support. The limiting mechanism includes a limiting sleeve extending toward the center of the rotating column on the first or second rotating tooth, and a limiting plate correspondingly provided in the transmission support. Along the length of the transmission support, the limiting sleeve and the limiting plate abut against each other.

4. The seat according to claim 1, characterized in that: The gear transmission ratio between the first rotating tooth and the back moving tooth is 1:1; the gear transmission ratio between the second rotating tooth and the bottom fixed tooth is 1:

2.

5. The seat according to claim 1, characterized in that: Furthermore, from front to back, the balance guide plate is inclined downwards and backwards; and the angle between the balance guide plate and the seat support is an acute angle.

6. The seat according to claim 1, characterized in that: In the initial position, the line connecting the centers of the two rolling horizontal axes is perpendicular to the length direction of the balance guide plate.

7. The seat according to claim 1, characterized in that: The transmission support is a shell structure with the opening facing outwards, and the rotating gear is located inside the transmission support; and a side cover is detachably connected to the transmission support.

8. The seat according to claim 1 or 7, characterized in that: The transmission support is configured to connect to the handrail.

9. The seat according to claim 1, characterized in that: From back to front, the seat connector extends forward and upward, and the upper end of the seat connector is rotatably connected to the upper part of the transmission support; the bracket includes a support plate extending forward and upward from the base, and the support plate is a steel plate.

10. The seat according to claim 1, characterized in that: The back moving tooth and the back connecting member, and the bottom fixed tooth and the bracket are fixed by snap-fit; polygonal snap-fit ​​blocks are provided on the back connecting member and the bracket respectively, and snap-fit ​​grooves are provided on the back moving tooth and the bottom fixed tooth respectively.

11. The seat according to claim 1, characterized in that: The bracket has upward-extending arms on both sides, and the bottom fixed teeth are connected to the arms.

12. The seating support method for the seat according to claim 1, characterized in that: The method is as follows: In the initial position, the seat support is in a state of being higher in the front and lower in the back, and the back support is close to an upright state; the user sits on the seat and applies a back thrust to the back support to drive it to tilt backward. The back connector moves with the back support and drives the gear between the back moving tooth and the first rotating tooth to rotate, causing the rotating tooth to rotate within the transmission support; correspondingly, the second rotating tooth rotates relative to the bottom fixed tooth, and the rotating tooth, in conjunction with the transmission support, rotates forward around the bottom fixed tooth to drive the rear end of the seat support to move upward and forward to the tilted position; the back connector rotates downward around the upper end of the transmission support, causing the bottom end of the back support to move downward and forward.

Images