Dual system seat

Abstract

The invention discloses a dual-system seat. The dual-system seat comprises a backrest; a seat; the base comprises a chair seat supporting part and a backrest supporting part which are hinged with each other; the rotating supporting rods are arranged on the left side and the right side of the front end of the chair seat supporting part, each rotating supporting rod comprises a short supporting rod and a long supporting rod which are mutually inclined and always kept relatively fixed, the intersection and connection part of the lower ends of the short supporting rods and the long supporting rods is a rotating part, and the rotating part is hinged to the chair seat supporting part; the upper end of the long supporting rod is hinged to the backrest, the upper end of the short supporting rod is hinged to the seat, and the seat can slide up and down relative to the seat supporting part and drives the short supporting rod to rotate back and forth around the rotating part; the lower end of the rear support is hinged to the rear end of the backrest supporting part, and the upper end of the rear support is connected to the backrest; the dual-system seat has a switchable initial state, a self-adaptive waist supporting state and a self-load leaning state.

Description

Technical Field

[0001] The invention relates to the technical field of seats, and in particular to a dual-system seat. Background Art

[0002] Nowadays, people often need to sit for a long time to work or study. If the sitting posture is not correct during this period, it is easy to cause myopia, scoliosis, lumbar muscle strain and many other diseases, especially for adolescents whose bodies are still developing, such problems are particularly serious. In order to allow users to maintain a good sitting posture, a push-back chair has appeared on the existing market. When the user sits on the push-back chair, the backrest of the push-back chair will automatically move forward, thereby stably supporting the user's back and helping the user to correct the sitting posture.

[0003] For example, the applicant's prior patent provides a seat bracket and a seat (publication number: CN219661278U), which are composed of a base, a mounting rod, a support rod, an armrest and a connecting rod to form a four-bar linkage. When the four-bar linkage is actuated, the connecting block on the mounting rod rotates forward / backward, and the backrest mounting seat on the armrest moves forward / backward with the armrest. When the connecting block rotates forward, the seat connecting frame is driven to descend and move forward; when the connecting block rotates backward, the seat connecting frame is driven to rise and move backward; since the backrest mounting seat moves forward / backward with the armrest, the backrest installed on the backrest mounting seat moves forward and backward accordingly, so that the backrest can maintain a correct support angle for the human body.

[0004] However, in line with the orientation of continuous improvement and development in the direction of structural optimization, the following deficiencies were found: when the chair is in use, the backrest can only maintain a vertical posture and move forward and backward; if the user wants to lie down to rest after being tired from work or study, the backrest cannot be rotated backward to a large angle to a suitable angle for the user to lie down, resulting in the user being unable to lie back to rest on the chair. The chair cannot meet the user's deeper needs and is relatively insufficient in practicality. Summary of the invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a dual-system chair, in which a backrest, a long support rod, a rear bracket and a backrest support part are hinged to each other to form a parallel four-bar linkage structure, and the long support rod drives the short support rod to rotate, and links the seat to move up and down; the chair not only has an adaptive lumbar support state in which the backrest responds to the sinking of the seat and moves forward to chase the back, but also has a self-weight tilting state in which the backrest tilts backward and the seat is lifted up accordingly, which can meet the user's back chasing adjustment needs and pitch adjustment needs at the same time and has good practicality.

[0006] The effect of the present invention is achieved in this way: The embodiment of the present application provides a dual-system seat, comprising: a backrest configured to support a user's back; a seat configured to support a user while sitting; The base is a split structure, including a seat support part and a backrest support part spliced ​​up and down, the front end of the seat support part and the front end of the backrest support part are hinged to each other, so that the backrest support part can rotate up and down relative to the seat support part; A rotating support rod, which is arranged on the left and right sides of the front end of the seat support part. The rotating support rod comprises a short support rod and a long support rod which are inclined to each other and always remain relatively fixed. The part where the lower ends of the short support rod and the long support rod meet and connect is the rotating part. The rotating support rod is hinged to the seat support part through the rotating part, so that the rotating support rod as a whole can rotate synchronously around the rotating part. The upper end of the long support rod is hinged to the backrest, and the upper end of the short support rod is hinged to the seat. The seat can slide up and down relative to the seat support part, and drive the short support rod to rotate forward and backward around the rotating part. A rear bracket, the lower end of which is hinged to the rear end of the backrest support portion, and the upper end of which is hinged to the backrest; The dual-system seat has a switchable initial state, an adaptive lumbar support state and a self-loaded reclining state; when the dual-system seat is in the initial state, the seat is not under pressure and is in a higher position, and the backrest is not subjected to a reclining force and remains in an upright state; in the initial state, when the seat is under pressure and moves downward, the dual-system seat switches to an adaptive lumbar support state, and the short support rod and the long support rod are driven by the seat to swing forward synchronously, and the rear bracket swings forward synchronously in response to the long support rod, thereby causing the backrest hinged to the long support rod and the upper side of the rear bracket to be driven to translate forward and eject; in the initial state, when the backrest is subjected to a reclining force, the dual-system seat switches to a self-loaded reclining state, and the backrest support portion rotates downward relative to the seat support portion, and the backrest rotates downward synchronously in response to the backrest support portion, and the long support rod and the rear bracket rotate backward synchronously, so that the upper backrest can tilt backward, and the short support rod and the long support rod swing backward synchronously, and drive the seat to move upward.

[0007] Furthermore, in the adaptive lumbar support state, the backrest moves 0-15cm in the horizontal direction; in the self-loaded reclining state, the backrest has a reclining angle of 0-30°. In the adaptive lumbar support state, the backrest has a long enough forward and backward sliding stroke to adapt to the seat depth of users of all sizes; in the self-loaded reclining state, the backrest has a large enough pitch angle to ensure that the user can rest in a comfortable supine position, which is more practical.

[0008] Furthermore, a locking device is provided between the seat support part and the backrest support part, and the locking device has a switchable locking state and unlocking state; when the dual-system seat is switched to the adaptive lumbar support state, the locking device is in the locking state, and the seat support part and the backrest support part are relatively fixed; when the dual-system seat is switched to the self-loaded reclining state, the locking device is in the unlocking state, and the backrest support part can be rotated relative to the seat support part again. By switching the locking state and the unlocking state with the help of the locking device, the dual-system seat can be switched between the initial state, the adaptive lumbar support state, and the self-loaded reclining state, and the adjustment operation is relatively simple; and the adaptive lumbar support state and the self-loaded reclining state do not interfere with each other, so that the stability of the dual-system seat is better.

[0009] Furthermore, a first connection part is provided at the front end of the seat support part, and a second connection part is provided at the front end of the backrest support part, the first connection part is hinged to the second connection part, a first limit hole is hollowed out on the upper edge of the first connection part in the left and right directions, and a second limit hole is hollowed out on the upper edge of the second connection part in the left and right directions; the locking device includes a locking pin, and the locking pin is slidably connected to the first limit hole and the second limit hole; in the locked state, the first limit hole is connected to the second limit hole, and the locking pin slides to be simultaneously engaged in the first limit hole and the second limit hole, so that the second connection part cannot rotate relative to the first connection part, and the seat support part and the backrest support part are relatively fixed; in the unlocked state, the locking pin slides to avoid the first limit hole or the second limit hole, and the backrest support part can be rotated relative to the seat support part again. The locking device is adjusted to switch between the locked state and the unlocked state by sliding and adjusting the locking pin to simultaneously engage or avoid the first limit hole and the second limit hole. Not only is the adjustment operation simple, but the overall structure is relatively simple and easy to set.

[0010] Furthermore, the front end of the backrest support part is provided with two second connecting parts that are symmetrical on both sides, the two second connecting parts are hinged to the left and right sides of the first connecting part, and the rotating parts on both sides are respectively hinged to the two second connecting parts; the locking device also includes a pressing part, which is arranged on one side of the rotating part close to the second connecting part; in the adaptive lumbar support state, the rotating part rotates forward, and the pressing part rotates accordingly and pushes the locking pin inward, so that the locking pin slides inward until it is simultaneously engaged with the first limiting hole and the second limiting hole, and the locking device enters the locking state, and the seat support part and the backrest support part are relatively fixed; in the self-loaded reclining state, the rotating part rotates backward, and the pressing part rotates accordingly and avoids the locking pin, so that the locking pin slides outward until it is separated from the first limiting hole, and the locking device enters the unlocking state, so that the backrest support part can be rotated downward relative to the seat support part again. When the dual-system seat switches from the initial state to the adaptive lumbar support state or the self-loaded reclining state, the locking device can automatically switch to the locked state or the unlocked state with the rotation of the rotating part, effectively improving the simplicity of the dual-system seat state switching operation.

[0011] Furthermore, a first elastic member is disposed in the second limiting hole, and the first elastic member acts on the locking pin, and makes the locking pin always have a tendency to move in a direction away from the first connection portion. When the dual-system seat is directly switched from the initial state to the self-loaded reclining state, the locking pin can automatically pop outward with the elastic force of the first elastic member and disengage from the first limiting hole, so that the locking device can automatically switch to the unlocked state, further improving the simplicity of the dual-system seat state switching operation.

[0012] Furthermore, the end surface of the extrusion portion close to the locking pin and / or the end surface of the locking pin close to the extrusion portion are arranged at an angle, so that when the rotating portion drives the extrusion portion to perform a circular motion and pushes the locking pin, the locking pin can slide toward the first connecting portion along the inclination direction of the above-mentioned end surface. By arranging the end surfaces of the extrusion portion and / or the locking pin close to each other at an angle, the structure is simple, and the circular rotation of the extrusion portion can be converted into the sliding of the locking pin along the horizontal direction.

[0013] Furthermore, a second elastic member is provided between the seat support portion and the backrest support portion, and the two ends of the second elastic member act on the seat support portion and the backrest support portion respectively, so that the backrest support portion always has a tendency to rotate toward the seat support portion. When the dual-system seat switches from the self-loaded tilting state back to the initial state, the backrest support portion will automatically rotate upward under the elastic force of the second elastic member, thereby driving the upper backrest to return to the initial state, thereby improving the simplicity of the dual-system seat state switching operation.

[0014] Furthermore, the backrest support portion includes a sliding support portion formed by extending backward from the rear end and a sliding member connected to the sliding support portion in a sliding manner in the front-back direction, and the bottom end of the rear bracket is hinged to the sliding member; in the self-loaded tilting state, the sliding member is subjected to the pressure from the rear bracket and slides forward, and the bottom end of the rear bracket is driven by the sliding member and slides forward, so that the top end of the rear bracket rotates backward and drives the backrest hinged to the top end of the rear bracket to tilt backward further. The backrest as a whole can tilt backward at a greater angle, which not only allows the user to lie on the seat in a more comfortable posture, but also as the seat is lifted, the backrest rotates at a greater angle, so that the back of the user will not be rubbed, and the user experience is more comfortable.

[0015] Furthermore, a gear adjustment member is fixedly connected to the sliding support part, a gear adjustment mechanism is arranged between the sliding member and the gear adjustment member, and the gear adjustment mechanism includes a clamping head and a plurality of gear slots, the clamping head is arranged on one of the sliding member and the gear adjustment member, and the plurality of gear slots are arranged on the other of the sliding member and the gear adjustment member; when the sliding member slides forward and backward relative to the gear adjustment member, the clamping head is engaged with the plurality of gear slots in sequence, so that the sliding member can be fixed at any position on the sliding support part, and then the backrest can be adjusted and fixed at the pitch angle with the help of the gear adjustment mechanism, which is more convenient to use.

[0016] Furthermore, the clamp is movably connected to the gear adjustment member, and a plurality of gear slots are correspondingly arranged on the sliding member. The gear adjustment mechanism has a switchable fixed state and a sliding state. In the fixed state, the clamp slides outward to be clamped in the gear slot, so that the sliding member and the gear adjustment member are relatively fixed; in the sliding state, the clamp slides inward to be retracted into the gear adjustment member and avoid the gear slot, so that the sliding member can slide relative to the gear adjustment member again. By means of the movement of the clamp to clamp or avoid the gear slot, the movement or fixation between the sliding member and the sliding support part is realized, which is convenient for manipulation and makes the gear adjustment operation relatively simple.

[0017] Furthermore, the sliding member is a plate-like structure, a first sliding support groove extending in the front-back direction is hollowed out on the sliding member, a gear adjustment member is slidably connected to the sliding member, a limiting portion is protruded on the gear adjustment member, the limiting portion passes through the first sliding support groove and is connected to the sliding support portion, so that the sliding member is clamped between the sliding support portion and the gear adjustment member, and the sliding member slides forward and backward relative to the limiting portion through the first sliding support groove. Not only does it make the connection strength between the sliding member and the sliding support portion higher, but it also makes the sliding process of the sliding member more stable and smooth.

[0018] Furthermore, the lower end of the seat is provided with two symmetrical chassis connecting parts, which are attached to the left and right sides of the seat support part. The chassis connecting parts and the seat support part are connected by a guide mechanism, which includes a guide groove and a guide pin that slide with each other. The guide groove is provided in one of the chassis connecting part and the seat support part, and the guide pin is provided in the other of the chassis connecting part and the seat support part. With the sliding of the guide pin in the guide groove, the seat slides up and down relative to the seat support part and links the short support rod to rotate forward and backward. The structure is simple and makes the transmission process between the seat and the short support rod more stable and smooth.

[0019] Furthermore, the guide groove includes a lumbar support guide part and a reclining guide part, both of which are arranged at an angle, and the inclination direction is from front to back and from low to high, and the inclination of the lumbar support guide part relative to the horizontal plane is greater than that of the reclining guide part. By arranging the guide groove at an angle, when the seat slides up and down, its position in the horizontal direction will also change, and the inclination of the lumbar support guide part is greater than that of the reclining guide part, so that in the adaptive lumbar support state, the seat changes less in the horizontal direction to avoid affecting the seat depth adjustment; in the self-loaded reclining state, the seat will move a longer distance in the horizontal direction, so as to adapt to the position change of the human buttocks when the backrest is reclined, and the support experience is more comfortable.

[0020] Furthermore, the short support rod is hinged to the front end of the seat, the chassis connection part is arranged at the rear end of the seat and the guide groove is provided at the chassis connection part. The seat can be located just above the base, and the position is more reasonable; by providing the guide groove at the chassis connection part, it is easy to process and will not affect the merging of the seat support part and the backrest support part.

[0021] Furthermore, a third elastic member is provided between the seat and the seat support portion. In the initial state, the third elastic member does not apply elastic force to the seat and the seat support portion; in the adaptive lumbar support state, the third elastic member applies a thrust to the seat and the seat support portion, so that the seat has a tendency to move away from the seat support portion; in the self-loaded reclining state, the third elastic member applies a pulling force to the seat and the seat support portion, so that the seat has a tendency to move toward the seat support portion. The seat can be automatically reset, and the seat drives the rotating support rod, the backrest support portion, the rear bracket and the backrest to move, so that the dual-system seat is reset to the initial state without the need for manual reset by the user, further improving the convenience of the dual-system seat state switching operation.

[0022] Furthermore, the third elastic member is a controllable gas spring, and the seat and the third elastic member are connected by a wire control mechanism, which includes an adjustment switch and a pull rope connected between the adjustment switch and the third elastic member, and the adjustment switch is configured to adjust the pull rope to pull or loosen the ejector pin of the third elastic member, so that the third elastic member can be fixed at any telescopic length. Only by pressing the adjustment switch can the third elastic member be adjusted to be telescopic or fixed, and the backrest can be driven to move or fix, and the adjustment operation is very simple.

[0023] The dual-system chair provided in the present application forms a parallel four-bar structure by hingedly connecting the backrest, long support rod, rear bracket and backrest support part to each other, and the long support rod drives the short support rod to rotate, and links the seat to move up and down, so that the dual-system chair not only has an adaptive lumbar support state in which the backrest responds to the sinking of the seat and moves forward to chase the back, but also has a self-weight tilting state in which the backrest tilts backward and the seat is lifted up accordingly. It can meet the user's needs for back chasing adjustment and pitch adjustment at the same time, and has good practicality. Moreover, by setting the chassis as a split structure, the seat support part and the backrest support part are locked or movable by means of a locking device. When the locking device is in a locked state, the long support rod and the rear bracket can only swing forward and backward, thereby driving the backrest to translate forward and backward; when the locking device is in an unlocked state, the backrest support part can be rotated downward relative to the seat support part, thereby driving the upper backrest to rotate downward together; thus, by switching the locking state and the unlocking state with the locking device, the dual-system seat can be switched between the initial state, the adaptive lumbar support state and the self-loaded tilting state, and the adjustment operation is relatively simple; and in the adaptive lumbar support state, the backrest cannot be pitched back, which will not affect the backrest tracking adjustment; similarly, in the self-loaded tilting state, the backrest cannot be translated forward for adjustment, thereby not affecting the pitching adjustment of the backrest; that is, the adaptive lumbar support state and the self-loaded tilting state do not interfere with each other, which makes the dual-system seat have better stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of the three-dimensional structure of a dual-system seat provided in an embodiment of the present application; Figure 2 A schematic diagram of the bottom structure of a dual-system seat provided in an embodiment of the present application; Figure 3 A schematic diagram of the side structure of a dual-system seat in an initial state provided by an embodiment of the present application; Figure 4 A schematic diagram of the side structure of a dual-system seat in an adaptive lumbar support state provided by an embodiment of the present application; Figure 5 A schematic diagram of the side structure of a dual-system seat in a self-loaded reclining state provided by an embodiment of the present application; Figure 6 A schematic diagram of the change process of the dual-system seat when changing from the initial state to the adaptive lumbar support state provided in an embodiment of the present application; Figure 7 A schematic diagram of the change process of the dual-system seat when changing from the initial state to the self-loaded reclining state provided in an embodiment of the present application; Figure 8A schematic cross-sectional structure diagram of a dual-system seat provided in an embodiment of the present application; Fig. 9 A schematic diagram of the connection structure between the seat and the chassis provided in an embodiment of the present application; Fig.10 A schematic diagram of the connection structure between the seat support portion and the backrest support portion provided in an embodiment of the present application; Fig.11 A schematic diagram of the cross-sectional structure of the chassis in the unlocked state provided in an embodiment of the present application; Fig.12 A schematic diagram of the cross-sectional structure of the chassis in a locked state provided in an embodiment of the present application; Fig.13 A schematic diagram of the three-dimensional structure of the chassis and the rear bracket in a locked state provided in an embodiment of the present application; Fig.14 A schematic diagram of the three-dimensional structure of the chassis and the rear bracket in the unlocked state provided in an embodiment of the present application; Fig.15 A schematic diagram of the connection structure between the chassis and the rear bracket provided in an embodiment of the present application; Fig.16 A schematic diagram of the internal structure of the gear adjustment mechanism provided in an embodiment of the present application; Fig.17 A schematic diagram of the connection structure between the gear adjustment member and the sliding member in a fixed state provided in an embodiment of the present application; Fig.18 A schematic diagram of the connection structure between the gear adjustment member and the sliding member in a sliding state provided in an embodiment of the present application.

[0025] The reference numerals of the figures are: 1 - backrest, 110 - armrest, 120 - armrest, 2 - seat, 210 - chassis connection part, 211 - guide groove, 211a - waist support guide part, 211b - reclining guide part, 220 - third elastic member, 230 - adjustment switch, 3 - seat support part, 301 - guide pin, 310 - first connection part, 311 - first limiting hole, 320 - transmission member, 4 - backrest support part, 401 - locking pin, 402 - first elastic member, 403 - second elastic member, 410 - third elastic member, 420 - third elastic member, 430 - third elastic member, 440 - third elastic member, 450 - third elastic member, 460 - third elastic member, 470 - third elastic member, 480 - third elastic member, 490 - third elastic member, 501 - third elastic member, 510 - third elastic member, 520 - third elastic member, 530 - third elastic member, 540 - third elastic member, 551 - third elastic member, 561 - third elastic member, 570 - third elastic member, 580 - third elastic member, 590 - third elastic member, 601 - third elastic member, 610 - third elastic member, 620 - third elastic member, 630 - third elastic member, 640 - third elastic member, 651 - third elastic member, 661 - third elastic member, 671 - third elastic member, 680 - third elastic member, 690 - third elastic member, 702 - third elastic member, 713 - third elastic member, 721 - third elastic member, 730 - third elastic member, 741 - third elastic member, 752 - third elastic member, 763 - third elastic member, 771 - third elastic member, 780 - third elastic member, Second connecting part, 411-second limiting hole, 420-sliding support part, 430-sliding member, 431-gear slot, 432-first sliding support slot, 433-second sliding support slot, 440-gear adjustment member, 441-clamp, 442-limiting part, 443-accommodating chamber, 444-torsion spring, 445-push-pull member, 446-fourth elastic member, 5-rotating support rod, 510-short support rod, 520-long support rod, 530-rotating part, 531-extrusion part, 6-rear bracket. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0027] Please refer to the attached Figure 1-18 , the embodiment of the present application provides a dual system seat, comprising: A backrest 1, configured to support the back of a user; A seat 2, configured to support a user while sitting; The base is a split structure, including a seat support part 3 and a backrest support part 4 spliced ​​together, the front end of the seat support part 3 and the front end of the backrest support part 4 are hinged to each other, so that the backrest support part 4 can rotate up and down relative to the seat support part 3; The rotating support rod 5 is arranged on the left and right sides of the front end of the seat support part 3. The rotating support rod 5 includes a short support rod 510 and a long support rod 520 which are inclined to each other and always remain relatively fixed. The part where the lower ends of the short support rod 510 and the long support rod 520 meet and connect is a rotating part 530. The rotating support rod 5 is hinged to the seat support part 3 through the rotating part 530, so that the rotating support rod 5 as a whole can rotate synchronously around the rotating part 530; the upper end of the long support rod 520 is hinged to the backrest 1, and the upper end of the short support rod 510 is hinged to the seat 2. The seat 2 can slide up and down relative to the seat support part 3, and drive the short support rod 510 to rotate forward and backward around the rotating part 530; A rear bracket 6, the lower end of which is hinged to the rear end of the backrest support portion 4, and the upper end of which is hinged to the backrest 1; The dual-system seat has a switchable initial state, an adaptive lumbar support state, and a self-loaded reclining state; when the dual-system seat is in the initial state, the seat 2 is not pressed and is in a higher position, and the backrest 1 is not subjected to reclining force and remains upright; in the initial state, when the seat 2 is pressed and moves downward, the dual-system seat switches to the adaptive lumbar support state, and the short support rod 510 and the long support rod 520 are driven by the seat 2 to swing forward synchronously, and the rear bracket 6 responds to the long support rod 520 and swings forward synchronously, thereby making the backrest 6 hinged on the long support rod 520 swing forward synchronously. The backrest 1 on the upper side of the support rod 520 and the rear bracket 6 is driven to move forward and out; in the initial state, when the backrest 1 is subjected to a reclining force, the dual-system seat switches to a self-loaded reclining state, and the backrest support part 4 rotates downward relative to the seat support part 3. The backrest 1 responds to the backrest support part 4 and rotates downward synchronously, and the long support rod 4 and the rear bracket 6 rotate backward synchronously, so that the upper side of the backrest 1 can tilt backward, and the short support rod 510 and the long support rod 520 swing backward synchronously, and drive the seat 2 to move upward.

[0028] In this embodiment, the backrest 1, the long support rod 520, the rear bracket 6 and the backrest support part 4 are hinged to each other to form a parallel four-bar structure, and the long support rod 520 drives the short support rod 510 to rotate, and links the seat 2 to move up and down, so that the dual-system chair not only has an adaptive lumbar support state in which the backrest 1 responds to the sinking of the seat 2 and moves forward to chase the back, but also has a self-weight tilting state in which the backrest 1 tilts backward when leaning back and the seat 2 is lifted up accordingly. It can meet the user's needs for back chasing adjustment and pitch adjustment at the same time, and has good practicality.

[0029] Among them, preferably, the left and right ends of the backrest 1 extend forward to form an armrest portion 110, and the top end of the long support rod 520 is hinged to the armrest portion 110. The armrest portion 110 is a sleeve-like structure hollowed out in the vertical direction, and the left and right armrest portions 110 are both sleeved with armrests 120, so that in the adaptive waist support state or the self-loaded reclining state, the armrest 120 can move with the backrest 1, so that the armrest 120 can always remain in the position of supporting the user's hands, without the need for monotonous adjustment, and the use experience is more comfortable and convenient. In addition, the armrest 120 is slidably connected to the armrest portion 110 through an armrest height mechanism, so that the armrest 120 can slide up and down to adjust the height, which is more practical. The armrest height mechanism here is a common mechanism in existing chairs, and this patent will not go into too much detail.

[0030] Please refer to the attached Figure 6-7 In some embodiments of the present application, in the adaptive lumbar support state, the horizontal movement distance of the backrest 1 is 0-15cm; in the self-loaded reclining state, the reclining angle of the backrest 1 is 0-30°. In the adaptive lumbar support state, the backrest 1 has a sufficiently long forward and backward sliding stroke to adapt to the seat depth of users of various body shapes; in the self-loaded reclining state, the backrest 1 has a sufficiently large pitch angle to ensure that the user can rest in a comfortable supine position, which is more practical.

[0031] Please refer to the attached Figure 9-12 In some embodiments of the present application, a locking device is provided between the seat support portion 3 and the backrest support portion 4, and the locking device has a switchable locking state and an unlocking state; when the dual-system seat is switched to the adaptive lumbar support state, the locking device is in the locking state, and the seat support portion 3 and the backrest support portion 4 are relatively fixed; when the dual-system seat is switched to the self-loaded reclining state, the locking device is in the unlocking state, and the backrest support portion 4 can be rotated relative to the seat support portion 3 again.

[0032] In this embodiment, the seat support part 3 and the backrest support part 4 are locked or movable by a locking device. When the locking device is in a locked state, the long support rod 520 and the rear bracket 6 can only swing forward and backward, thereby driving the backrest 1 to translate forward and backward; when the locking device is in an unlocked state, the backrest support part 4 can rotate downward relative to the seat support part 3, thereby driving the upper backrest 1 to rotate downward together; thus, by switching the locking state and the unlocking state by the locking device, the dual-system seat can be switched between the initial state, the adaptive lumbar support state and the self-loaded tilting state, and the adjustment operation is relatively simple; and in the adaptive lumbar support state, the backrest 1 cannot be pitched, which will not affect the backrest adjustment of the backrest 1; similarly, in the self-loaded tilting state, the backrest 1 cannot be translated forward for adjustment, thereby not affecting the pitching adjustment of the backrest 1; that is, the adaptive lumbar support state and the self-loaded tilting state do not interfere with each other, so that the dual-system seat has better stability.

[0033] Of course, in other embodiments of the present application, a locking device may not be provided between the seat support portion 3 and the backrest support portion 4. The dual-system seat can be switched between the initial state, the adaptive lumbar support state and the self-weight reclining state by the user applying pressure to one of the seat 2 and the backrest 1. No further locking operation is required, and the adjustment operation is simpler.

[0034] Please refer to the attached Figure 9-12 In some embodiments of the present application, a first connection portion 310 is provided at the front end of the seat support portion 3, a second connection portion 410 is provided at the front end of the backrest support portion 4, the first connection portion 310 is hinged to the second connection portion 410, a first limiting hole 311 is hollowed out along the left and right sides of the upper edge of the first connection portion 310, and a second limiting hole 411 is hollowed out along the left and right sides of the upper edge of the second connection portion 410; the locking device includes a locking pin 401, and the locking pin 401 is slidably connected to the first limiting hole 311 and the second limiting hole 411. Two limiting holes 411; in the locked state, the first limiting hole 311 is connected to the second limiting hole 411, and the locking pin 401 slides to be simultaneously engaged in the first limiting hole 311 and the second limiting hole 411, so that the second connecting part 410 cannot rotate relative to the first connecting part 310, and the seat support part 3 and the backrest support part 4 are relatively fixed; in the unlocked state, the locking pin 401 slides to avoid the first limiting hole 311 or the second limiting hole 411, and the backrest support part 4 can be rotated relative to the seat support part 3 again.

[0035] In this embodiment, the locking device is adjusted to switch between the locked state and the unlocked state by sliding the locking pin 401 to engage or avoid the first limiting hole 311 and the second limiting hole 411. Not only is the adjustment operation simple, but the overall structure is also simple and easy to set up.

[0036] Among them, the backrest support part 4 and the seat support part 3 are both semi-open box-shaped structures. In the locked state, the seat support part 3 and the backrest support part 4 are closed to each other to form a complete base, making the structure of the base more compact, and the backrest support part 4 can rotate at a larger angle relative to the seat support part 3.

[0037] Please refer to the attached Figure 9-12 In some embodiments of the present application, the front end of the backrest support portion 4 is provided with two second connecting portions 410 that are symmetrical on the left and right sides, the two second connecting portions 410 are hinged to the left and right sides of the first connecting portion 310, and the rotating portions 530 on both sides are hinged to the two second connecting portions 410 respectively; the locking device also includes an extrusion portion 531, and the extrusion portion 531 is provided on one side of the rotating portion 530 close to the second connecting portion 410; in the adaptive back support state, the rotating portion 530 rotates forward, and the extrusion portion 531 rotates accordingly and pushes inward The locking pin 401 causes the locking pin 401 to slide inwardly until it is simultaneously engaged with the first limiting hole 311 and the second limiting hole 411, and the locking device enters a locked state, and the seat support portion 3 and the backrest support portion 4 are relatively fixed; in the self-loaded reclining state, the rotating portion 530 rotates backward, and the squeezing portion 531 rotates accordingly and avoids the locking pin 401, so that the locking pin 401 slides outwardly until it is disengaged from the first limiting hole 311, and the locking device enters an unlocked state, so that the backrest support portion 4 can be rotated downward relative to the seat support portion 3 again.

[0038] In this embodiment, by setting a pressing part 531 on the rotating part 530, the pressing part 531 performs a circular motion with the rotation of the rotating part 530 and pushes or avoids the locking pin 401, so that when the dual-system seat switches from the initial state to the adaptive lumbar support state or the self-loaded reclining state, the locking device can automatically switch to the locked state or unlocked state with the rotation of the rotating part 530, without the need for manual adjustment by the user, thereby effectively improving the simplicity of the dual-system seat state switching operation. In addition, the front end of the backrest support part 4 is provided with two left-right symmetrical second connecting parts 410, and the two rotating parts 530 are respectively connected to the second connecting parts 410 on both sides, so that the seat support part 3 and the backrest support part 4 are limited by two sets of locking pins 401, and with the rotation of the rotating support rods 5 on both sides of the dual-system seat, the two sets of locking pins 401 are simultaneously driven to slide, so that the locking or unlocking operation between the seat support part 3 and the backrest support part 4 is more stable.

[0039] Please refer to the attached Figure 11-12 In some embodiments of the present application, a first elastic member 402 is disposed in the second limiting hole 411 , and the first elastic member 402 acts on the locking pin 401 and causes the locking pin 401 to always have a tendency to move in a direction away from the first connecting portion 310 .

[0040] In this embodiment, when the dual-system seat switches directly from the initial state to the self-loaded reclining state, when the rotating part 530 rotates to the extrusion part 531 to avoid the locking pin 401, the locking pin 401 can automatically pop outward with the help of the elastic force of the first elastic member 402 and disengage from the first limiting hole 311, so that the locking device can automatically switch to the unlocked state, so that the dual-system seat can automatically enter the adaptive support state, further improving the simplicity of the dual-system seat state switching operation.

[0041] Among them, preferably, the first elastic member 402 is a spring, and the locking pin 401 is a T-shaped structure as a whole. The wider side of the locking pin 401 is close to the extrusion portion 531, and the spring is sleeved on the slender side of the locking pin 401 and squeezes the locking pin 401 outward. The structure is simple and easy to set up.

[0042] Please refer to the attached Figure 9-10 In some embodiments of the present application, the end surface of the extrusion portion 531 close to the locking pin 401 and / or the end surface of the locking pin 401 close to the extrusion portion 531 is inclined, so that when the rotating portion 530 drives the extrusion portion 531 to perform a circular motion and pushes the locking pin 401, the locking pin 401 can slide toward the first connecting portion 310 along the inclined direction of the above-mentioned end surface.

[0043] In this embodiment, by tilting the end surfaces of the pressing portion 531 and / or the locking pin 401 that are close to each other, the structure is simple and the circular rotation of the pressing portion 531 can be converted into the sliding of the locking pin 401 in the horizontal direction.

[0044] Preferably, the end surface of the extrusion portion 531 close to the locking pin 401 and the end surface of the locking pin 401 close to the extrusion portion 531 are both inclined, so that the transmission between the two is more stable and smooth.

[0045] Please refer to the attached Fig.10 In some embodiments of the present application, a second elastic member 403 is provided between the seat support portion 3 and the backrest support portion 4, and the two ends of the second elastic member 403 act on the seat support portion 3 and the backrest support portion 4 respectively, so that the backrest support portion 4 always has a tendency to rotate toward the seat support portion 3.

[0046] In this embodiment, a second elastic member 403 is provided between the seat support portion 3 and the backrest support portion 4. When the dual-system seat switches from the self-loaded tilting state back to the initial state, the backrest support portion 4 will automatically rotate upward under the elastic force of the second elastic member 403, thereby driving the upper backrest 1 to rotate forward back to the vertical state, thereby resetting to the initial state. The user does not need to manually rotate the backrest 1 to reset, thereby improving the convenience of the dual-system seat state switching operation.

[0047] Please refer to the attached Figure 13-14In some embodiments of the present application, the backrest support portion 4 includes a sliding support portion 420 formed by extending backward at the rear end and a sliding member 430 slidably connected to the sliding support portion 420 in the front-to-back direction, and the bottom end of the rear bracket 6 is hinged to the sliding member 430; in the self-loaded tilting state, the sliding member 430 is subjected to the pressure from the rear bracket 6 and slides forward, and the bottom end of the rear bracket 6 is driven by the sliding member 430 and slides forward, so that the top end of the rear bracket 6 rotates backward, and drives the backrest 1 hinged to the top end of the rear bracket 6 to further tilt backward.

[0048] In this embodiment, if the backrest 1 is tilted only by rotating the backrest support part 4, since the rotation angle of the backrest support part 4 is small, the rotation angle of the backrest 1 is also small, resulting in the user being unable to lie back on the chair and the demand cannot be met; and since the seat 2 will move up synchronously with the reclining of the backrest 1, when the backrest 1 is in the process of tilting, if the backrest 1 cannot be rotated to a larger angle, as the seat 2 is lifted, the backrest 1 will rub the user's back, resulting in a poor user experience. Therefore, by hingedly connecting the bottom end of the rear bracket 6 to the sliding member 430 which can slide forward and backward, in the self-loaded reclining state, in addition to driving the backrest 1 to recline due to the rotation of the backrest support part 4, the rear bracket 6 rotates backward as a whole as the sliding member 430 moves forward, driving the upper backrest 1 to recline further backward, so that the backrest 1 as a whole can recline backward at a greater angle, which not only allows the user to lie on the seat in a more comfortable posture, but also as the seat 2 is lifted, the backrest 1 rotates at a larger angle, thereby not causing rubbing of the user's back, and providing a more comfortable user experience.

[0049] Among them, a transmission member 320 is also connected between the seat support part 3 and the sliding member 430, the front end of the transmission member 320 is hinged to the rear end of the seat support part 3, and the rear end of the transmission member 320 is hinged to the sliding member 430. The seat support part 3, the backrest support part 4, the sliding member 430 and the transmission member 320 are combined to form a structure similar to a three-link and one slide slot. When the backrest support part 4 rotates downward, the sliding member 430 is restricted by the transmission member 320 and forced to slide forward; when the backrest support part 4 rotates upward, the sliding member 430 is restricted by the transmission member 320 and forced to slide backward. Therefore, by setting the transmission member 320, the movement of the sliding member 430 is further restricted, so that the movement process of the sliding member 430 is more stable and smooth.

[0050] Please refer to the attached Figure 15-18In some embodiments of the present application, a gear adjustment member 440 is fixedly connected to the sliding support portion 420, and a gear adjustment mechanism is arranged between the sliding member 430 and the gear adjustment member 440. The gear adjustment mechanism includes a clamping head 441 and a plurality of gear grooves 431. The clamping head 441 is arranged in one of the sliding member 430 and the gear adjustment member 440, and the plurality of gear grooves 431 are arranged in the other of the sliding member 430 and the gear adjustment member 440; when the sliding member 430 slides back and forth relative to the gear adjustment member 440, the clamping head 441 is engaged with the plurality of gear grooves 431 in sequence.

[0051] In this embodiment, the sliding member 430 and the gear adjustment member 440 are adjusted in gear through the clamp 441 and the gear slot 431, so that the sliding member 430 can be fixed at any position on the sliding support part 420, and then the backrest 1 can be adjusted and fixed in pitch angle with the help of the gear adjustment mechanism, which is more convenient to use.

[0052] Please refer to the attached Figure 15-18 In some embodiments of the present application, the clamping head 441 is movably connected to the gear adjusting member 440, and a plurality of gear slots 431 are correspondingly arranged on the sliding member 430. The gear adjusting mechanism has a switchable fixed state and a sliding state. In the fixed state, the clamping head 441 slides outward until it is clamped in the gear slot 431, so that the sliding member 430 and the gear adjusting member 440 are relatively fixed; in the sliding state, the clamping head 441 slides inward until it is retracted into the gear adjusting member 440 and avoids the gear slot 431, so that the sliding member 430 can slide relative to the gear adjusting member 440 again.

[0053] In this embodiment, the clamping head 441 is movably set on the gear adjustment member 440, and the gear groove 431 is clamped or avoided by means of the movement of the clamping head 441, so as to realize the movement or fixation between the sliding member 430 and the sliding support part 420, which is easy to operate and makes the gear adjustment operation relatively simple.

[0054] Please refer to the attached Figure 17-18The sliding member 430 is a plate-like structure. The bottom end of the sliding member 430 is recessed upward to form a second sliding support groove 433 extending along the length direction. The gear adjustment member 440 is arranged in the second sliding support groove 433, and the sliding member 430 slides forward and backward relative to the gear adjustment member 440 through the second sliding support groove 433, so that the connection strength between the two is better and the sliding process is more stable. The left and right sides of the gear adjustment member 440 are provided with a clamping head 441, and the left and right side walls of the second sliding support groove 443 are correspondingly provided with a gear groove 431. The gear adjustment member 440 is a hollow structure, including an internal accommodating cavity 443. One end of the left and right clamping heads 441 pass through the side wall of the gear adjustment member 440 and extend into the accommodating cavity 443. Two left-right symmetrical torsion springs 444 are arranged in the accommodating cavity 443. The force arms on one side of the two torsion springs 444 are respectively connected to the clamping heads 441 on both sides, and the force arms on the other sides of the two torsion springs 441 are both connected to the push-pull member 445; the push-pull member 445 can slide back and forth in the accommodating cavity 443, and drive the torsion spring 444 to pull or push the clamping head 441 inward. The seat 2 is also provided with a wire control mechanism, including an adjustment switch 230 and a pull rope provided on the seat 2, one end of the pull rope is connected to the adjustment switch 230, and the other end passes through the gear adjustment member 440 and is connected to the push-pull member 445. When the adjustment switch 230 is turned on, the pull rope pulls the push-pull member 445 to slide forward, and drives the torsion spring 444 to pull the clamp 441 inward, so that the sliding member 430 can slide relative to the gear adjustment member 440 again; the rear end of the push-pull member 445 is also connected to a The fourth elastic member 446 always pulls the push-pull member 445, so that the push-pull member 445 always has a tendency to slide backward, and then when the adjustment switch 230 is turned off, the pull rope loosens the push-pull member 445, and the push-pull member 445 automatically slides backward and resets under the elastic force of the fourth elastic member 446, and drives the torsion spring 444 to push the clamping head 441 outward, so that the clamping head 441 is re-engaged in the gear slot 431, and the sliding member 430 is re-fixed to the gear adjustment member 440. Therefore, the locking and unlocking of the gear adjustment mechanism can be controlled by the wire control mechanism, and the operation is relatively simple.

[0055] Preferably, along the length direction, four rows of gear slots 431 are provided on the sliding member 430, so that the gear adjustment mechanism has four adjustable gears, and the adjustment freedom is high. Of course, in other embodiments of the present application, the number of gear slots 431 on the sliding member 430 can also be three rows, five rows, six rows, etc.

[0056] Please refer to the attached Fig.15In some embodiments of the present application, the sliding member 430 is a plate-like structure, and a first sliding support groove 432 extending in the front-to-back direction is hollowed out on the sliding member 430. A gear adjustment member 440 is slidably connected to the sliding member 430, and a limiting portion 442 is protruded from the gear adjustment member 440. The limiting portion 442 passes through the first sliding support groove 432 and is connected to the sliding support portion 420, so that the sliding member 430 is clamped between the sliding support portion 420 and the gear adjustment member 440, and the sliding member 430 slides forward and backward relative to the limiting portion 442 through the first sliding support groove 432.

[0057] In this embodiment, the sliding member 430 is clamped by the sliding support portion 420 and the gear adjustment portion 440, and the sliding distance of the sliding member 430 is limited by the limiting portion 442 and the first sliding support groove 432, which not only makes the connection strength between the sliding member 430 and the sliding support portion 420 higher, but also makes the sliding process of the sliding member 430 more stable and smooth.

[0058] Preferably, two symmetrical limiting parts 442 are formed on the gear adjustment member 440, and two first sliding support grooves 432 are correspondingly hollowed out on the sliding member 430, so as to further enhance the connection strength between the sliding member 430 and the gear adjustment member 440. After the limiting parts 442 pass through the first sliding support grooves 432, the gear adjustment member 440 and the sliding support part 420 are fixed by screw connection, so that the sliding member 430, the gear adjustment member 440 and the sliding support part 420 are mutually detachably arranged, so that the installation and removal operations of the chassis are more convenient.

[0059] Please refer to the attached Figure 2-4 In some embodiments of the present application, two left-right symmetrical chassis connecting parts 210 are provided at the lower end of the seat 2, and the two chassis connecting parts 210 are attached to the left and right sides of the seat support part 3. The chassis connecting part 210 and the seat support part 3 are connected by a guide mechanism, and the guide mechanism includes a guide groove 211 and a guide pin 301 that slide with each other. The guide groove 211 is provided in one of the chassis connecting part 210 and the seat support part 3, and the guide pin 301 is provided in the other of the chassis connecting part 210 and the seat support part 310.

[0060] In this embodiment, a guiding structure is provided between the chassis connecting portion 210 and the seat support portion 3, so that a structure similar to a three-linkage-one-slide groove is formed between the seat 2, the short support rod 510, the seat support portion 3 and the guide groove 211. With the sliding of the guide pin 301 in the guide groove 211, the seat 2 slides up and down relative to the seat support portion 3 and links the short support rod 510 to rotate forward and backward. The structure is simple and makes the transmission process between the seat 2 and the short support rod 510 more stable and smooth.

[0061] Of course, in other embodiments of the present application, transmission can also be achieved between the seat 2, the short support rod 510 and the seat support part 3 through other mechanisms. For example, another sub-support rod is hinged between the seat 2 and the seat support part 3, so that a mechanism similar to a four-bar linkage is formed between the sub-support rod, the seat 2, the short support rod 510 and the seat support part 3, so that when the seat 2 slides up and down relative to the seat support part 3, the short support rod 510 and the sub-support rod can be driven to rotate forward and backward together.

[0062] Please refer to the attached Figure 2-4 In some embodiments of the present application, the guide groove 211 includes a waist support guide portion 211a and a tilt guide portion 211b. The waist support guide portion 211a and the tilt guide portion 211b are both inclined, and the inclination direction is from front to back and from low to high. The inclination of the waist support guide portion 211a compared to the horizontal plane is greater than that of the tilt guide portion 211b.

[0063] In this embodiment, by tilting the guide groove 211, the position of the seat 2 in the horizontal direction will also change when it slides up and down, and the inclination of the lumbar support guide portion 211a is greater than that of the reclining guide portion 211b, so that in the adaptive lumbar support state, the seat 2 changes less in the horizontal direction, thereby avoiding affecting the seat depth adjustment; in the self-loaded reclining state, the seat 2 will move a longer distance in the horizontal direction, thereby adapting to the change in the position of the human body's buttocks when the backrest 1 leans back, and the support experience is more comfortable.

[0064] Please refer to the attached Figure 1-2 In some embodiments of the present application, the short support rod 510 is hinged to the front end of the seat 2, the chassis connecting portion 210 is arranged at the rear end of the seat 2 and the guide groove 211 is opened in the chassis connecting portion 210.

[0065] In this embodiment, the rotating support rod 5 is hinged to the front side of the base, the short support rod 510 is hinged to the front end of the seat 2, and the chassis connecting part 210 is arranged at the rear end of the seat 2, so that the seat 2 can be located just above the base, and the position is more reasonable; by opening the guide groove 211 in the chassis connecting part 210, it is easy to process and will not affect the merging of the seat support part 3 and the backrest support part 4.

[0066] In other embodiments of the present application, if the rotating support rod 5 is connected to the rear side of the base, the short support rod 510 can be hinged to the rear end of the seat 2, and the chassis connecting portion 210 is disposed at the front end of the seat 2. In addition, the guide groove 211 can also be provided in the seat support portion 3.

[0067] Please refer to the attached Figure 8-9In some embodiments of the present application, a third elastic member 220 is provided between the seat 2 and the seat support portion 3. In the initial state, the third elastic member 220 does not apply elastic force to the seat 2 and the seat support portion 3; in the adaptive lumbar support state, the third elastic member 220 applies a thrust to the seat 2 and the seat support portion 3, so that the seat 2 has a tendency to move away from the seat support portion 3; in the self-loaded reclining state, the third elastic member 220 applies a pulling force to the seat 2 and the seat support portion 3, so that the seat 2 has a tendency to move toward the seat support portion 3. When the user does not need to use the seat or needs to switch the state again, the seat 2 can automatically reset with the elastic force of the third elastic member 220, and the seat 2 drives the rotating support rod 5, the backrest support portion 4, the rear bracket 6 and the backrest 1 to move, so that the dual-system seat is reset to the initial state without the need for manual reset by the user, further improving the convenience of the dual-system seat state switching operation.

[0068] Please refer to the attached Figure 1-8 In some embodiments of the present application, the third elastic member 220 is a controllable gas spring. The seat 2 and the third elastic member 220 are connected by a wire control mechanism. The wire control mechanism includes an adjustment switch 230 and a pull rope connected between the adjustment switch 230 and the third elastic member 220. The adjustment switch 230 is configured to adjust the pull rope to pull or loosen the pin of the third elastic member 220, so that the third elastic member 220 can be fixed at any telescopic length.

[0069] In this embodiment, by using a controllable gas spring, not only can the seat 2 be subjected to elastic force, but it can also be fixed at any telescopic length, so that the position of the seat 2 is fixed, and the short support rod 510 is also restricted by the seat 2 and cannot rotate, thereby driving the long support rod 520 to remain fixed, thereby fixing the front and rear position of the backrest 1. In addition, the third elastic member 220 is controlled by a wire control mechanism, and the third elastic member 220 can be adjusted to be telescopic or fixed by only pressing the adjustment switch 230, and the adjustment operation is very simple.

[0070] Among them, the adjustment switch 230 controls not only the third elastic member 220, but also the push-pull member 445 in the gear adjustment member 440, so that after the adjustment switch 230 is turned on, the third elastic member 220 can be retracted and retracted again, the backrest 1 can be translated forward and backward, and the push-pull member 445 pulls the torsion spring 444 downward and drives the clamp 441 to retract, the sliding member 430 can slide forward and backward and drive the backrest 1 to adjust the reclining angle, so that the backrest 1 as a whole can be adjusted movably; when the adjustment switch 230 is closed, the length of the third elastic member 220 is fixed, the front and rear positions of the backrest 1 are fixed, and the push-pull member 445 releases the torsion spring 444 and drives the clamp 441 to pop out, the position of the sliding member 430 is fixed and the backrest 1 cannot be rotated to adjust the reclining angle, so that the backrest 1 as a whole remains fixed. Therefore, by pressing the adjustment switch 230, the fixation or activity of the backrest 1 as a whole can be controlled, further improving the simplicity of the dual-system seat adjustment operation.

Claims

1. A dual system seat, characterized in that: include: A backrest (1) configured to support a user's back; A seat (2) configured to support a user while sitting; A base, the base being a split structure, comprising a seat support portion (3) and a backrest support portion (4) spliced ​​together from top to bottom, the front end of the seat support portion (3) and the front end of the backrest support portion (4) being hinged to each other, so that the backrest support portion (4) can rotate up and down relative to the seat support portion (3); A rotating support rod (5), the rotating support rod (5) being arranged on the left and right sides of the front end of the seat support portion (3), the rotating support rod (5) comprising a short support rod (510) and a long support rod (520) which are inclined to each other and always remain relatively fixed, the portion where the lower ends of the short support rod (510) and the long support rod (520) intersect and connect is a rotating portion (530), the rotating support rod (5) is hinged to the seat support portion (3) through the rotating portion (530), so that the rotating support rod (5) as a whole can rotate synchronously around the rotating portion (530); the upper end of the long support rod (520) is hinged to the backrest (1), and the upper end of the short support rod (510) is hinged to the seat (2), and the seat (2) can slide up and down relative to the seat support portion (3), and drive the short support rod (510) to rotate forward and backward around the rotating portion (530); A rear bracket (6), the lower end of the rear bracket (6) being hinged to the rear end of the backrest support portion (4), and the upper end of the rear bracket (6) being hinged to the backrest (1); The dual-system seat has a switchable initial state, an adaptive lumbar support state, and a self-loaded reclining state; when the dual-system seat is in the initial state, the seat (2) is not pressed and is in a relatively high position, and the backrest (1) is not subjected to reclining force and remains in an upright state; in the initial state, when the seat (2) is pressed and moves downward, the dual-system seat switches to the adaptive lumbar support state, the short support rod (510) and the long support rod (520) are driven by the seat (2) to swing forward synchronously, and the rear bracket (6) responds to the long support rod (520) and swings forward synchronously, thereby causing the backrest (6) hinged to the long support rod (520) and the seat (2) to swing forward synchronously. The backrest (1) on the upper side of the rear bracket (6) is driven to move forward and out; in the initial state, when the backrest (1) is subjected to a reclining force, the dual-system seat switches to a self-loaded reclining state, the backrest support portion (4) rotates downward relative to the seat support portion (3), the backrest (1) responds to the backrest support portion (4) and rotates downward synchronously, and the long support rod (4) and the rear bracket (6) rotate backward synchronously, so that the backrest (1) on the upper side can tilt backward, and the short support rod (510) and the long support rod (520) swing backward synchronously, and drive the seat (2) to move upward.

2. The dual system seat according to claim 1, characterized in that: In the adaptive lumbar support state, the movement distance of the backrest (1) in the horizontal direction is 0-15 cm; in the self-loaded reclining state, the reclining angle of the backrest (1) is 0-30°.

3. The dual system seat according to claim 1, characterized in that: A locking device is provided between the seat support portion (3) and the backrest support portion (4), and the locking device has a switchable locking state and an unlocking state; when the dual-system seat is switched to the adaptive lumbar support state, the locking device is in the locked state, and the seat support portion (3) and the backrest support portion (4) are relatively fixed; When the dual-system seat is switched to a self-loaded reclining state, the locking device is in an unlocked state, and the backrest support portion (4) can be rotated relative to the seat support portion (3) again.

4. The dual system seat according to claim 3, characterized in that: The front end of the seat support portion (3) is provided with a first connection portion (310), the front end of the backrest support portion (4) is provided with a second connection portion (410), the first connection portion (310) is hinged to the second connection portion (410), the upper edge of the first connection portion (310) is hollowed out in the left and right directions and is provided with a first limiting hole (311), the upper edge of the second connection portion (410) is hollowed out in the left and right directions and is provided with a second limiting hole (411); the locking device comprises a locking pin (401), the locking pin (401) is slidably connected to the first limiting hole (311) and the second limiting hole (411); in the locked state In the unlocked state, the first limiting hole (311) is connected to the second limiting hole (411), and the locking pin (401) slides to be simultaneously engaged in the first limiting hole (311) and the second limiting hole (411), so that the second connecting portion (410) cannot rotate relative to the first connecting portion (310), and the seat support portion (3) and the backrest support portion (4) are relatively fixed; in the unlocked state, the locking pin (401) slides to avoid the first limiting hole (311) or the second limiting hole (411), and the backrest support portion (4) can be rotated relative to the seat support portion (3) again.

5. The dual system seat according to claim 4, characterized in that: The front end of the backrest support portion (4) is provided with two second connecting portions (410) which are symmetrical on the left and right sides, the two second connecting portions (410) are hinged to the left and right sides of the first connecting portion (310), and the rotating portions (530) on both sides are respectively hinged to the two second connecting portions (410); the locking device also includes a pressing portion (531), and the pressing portion (531) is arranged on a side of the rotating portion (530) close to the second connecting portion (410); In the adaptive lumbar support state, the rotating portion (530) rotates forward, and the squeezing portion (531) rotates accordingly and pushes the locking pin (401) inward, so that the locking pin (401) slides inward until it is simultaneously engaged with the first limiting hole (311) and the second limiting hole (411), and the locking device enters a locked state, and the seat support portion (3) and the backrest support portion (4) are relatively fixed; in the self-loaded reclining state, the rotating portion (530) rotates backward, and the squeezing portion (531) rotates accordingly and avoids the locking pin (401), so that the locking pin (401) slides outward until it is disengaged from the first limiting hole (311), and the locking device enters an unlocked state, so that the backrest support portion (4) can be rotated downward relative to the seat support portion (3) again.

6. The dual system seat according to claim 5, characterized in that: A first elastic member (402) is disposed in the second limiting hole (411), and the first elastic member (402) acts on the locking pin (401) to ensure that the locking pin (401) always has a tendency to move in a direction away from the first connecting portion (310).

7. The dual system seat according to claim 5, characterized in that: The end surface of the extrusion portion (531) close to the locking pin (401) and / or the end surface of the locking pin (401) close to the extrusion portion (531) is arranged inclined, so that when the rotating portion (530) drives the extrusion portion (531) to perform a circular motion and push the locking pin (401), the locking pin (401) can slide toward the first connecting portion (310) along the inclined direction of the above-mentioned end surface.

8. The dual system seat according to claim 1, characterized in that: A second elastic member (403) is provided between the seat support portion (3) and the backrest support portion (4), and two ends of the second elastic member (403) act on the seat support portion (3) and the backrest support portion (4) respectively, so that the backrest support portion (4) always has a tendency to rotate towards the seat support portion (3).

9. The dual system seat according to claim 1, characterized in that: The backrest support portion (4) comprises a sliding support portion (420) formed by extending rearwardly from the rear end, and a sliding member (430) connected to the sliding support portion (420) in a forward and backward sliding manner, and the bottom end of the rear bracket (6) is hinged to the sliding member (430); in a self-loaded tilting state, the sliding member (430) is subjected to pressure from the rear bracket (6) and slides forward, and the bottom end of the rear bracket (6) is driven by the sliding member (430) and slides forward, so that the top end of the rear bracket (6) rotates backward, and drives the backrest (1) hinged to the top end of the rear bracket (6) to further tilt backward.

10. The dual system seat according to claim 9, characterized in that: A gear adjustment member (440) is fixedly connected to the sliding support portion (420), and a gear adjustment mechanism is arranged between the sliding member (430) and the gear adjustment member (440). The gear adjustment mechanism comprises a clamping head (441) and a plurality of gear slots (431). The clamping head (441) is arranged on one of the sliding member (430) and the gear adjustment member (440), and the plurality of gear slots (431) are arranged on the other of the sliding member (430) and the gear adjustment member (440). When the sliding member (430) slides forward and backward relative to the gear adjustment member (440), the clamping head (441) is engaged with the plurality of gear slots (431) in sequence.

11. The dual system seat according to claim 10, characterized in that: The clamping head (441) is movably connected to the gear adjustment member (440), and the sliding member (430) is correspondingly provided with the plurality of gear slots (431). The gear adjustment mechanism has a switchable fixed state and a sliding state. In the fixed state, the clamping head (441) slides outwards until it is clamped in the gear slot (431), so that the sliding member (430) and the gear adjustment member (440) are relatively fixed; in the sliding state, the clamping head (441) slides inwards until it is retracted into the gear adjustment member (440) and avoids the gear slot (431), so that the sliding member (430) can slide relative to the gear adjustment member (440) again.

12. The dual system seat according to claim 9, characterized in that: The sliding member (430) is a plate-like structure. A first sliding support groove (432) extending in a front-to-rear direction is hollowed out on the sliding member (430). A gear adjustment member (440) is slidably connected to the sliding member (430). A limiting portion (442) is protruded from the gear adjustment member (440). The limiting portion (442) passes through the first sliding support groove (432) and is connected to the sliding support member (420), so that the sliding member (430) is clamped between the sliding support member (420) and the gear adjustment member (440), and the sliding member (430) slides forward and backward relative to the limiting portion (442) through the first sliding support groove (432).

13. The dual system seat according to claim 1, characterized in that: The lower end of the seat (2) is provided with two left-right symmetrical chassis connection parts (210), the two chassis connection parts (210) are fitted to the left and right sides of the seat support part (3), the chassis connection part (210) and the seat support part (3) are connected via a guide mechanism, the guide mechanism comprises a guide groove (211) and a guide pin (301) which are slidably matched with each other, the guide groove (211) is provided in one of the chassis connection part (210) and the seat support part (3), and the guide pin (301) is provided in the other of the chassis connection part (210) and the seat support part (310).

14. The dual system seat according to claim 13, characterized in that: The guide groove (211) comprises a waist-supporting guide portion (211a) and a reclining guide portion (211b); the waist-supporting guide portion (211a) and the reclining guide portion (211b) are both arranged to be inclined, and the inclination direction is from front to back and from low to high; and the inclination of the waist-supporting guide portion (211a) relative to the horizontal plane is greater than that of the reclining guide portion (211b).

15. The dual system seat according to claim 13, characterized in that: The short support rod (510) is hinged to the front end of the seat (2), the chassis connection portion (210) is arranged at the rear end of the seat (2), and the guide groove (211) is opened in the chassis connection portion (210).

16. The dual system seat according to claim 1, characterized in that: A third elastic member (220) is provided between the seat (2) and the seat support portion (3); in an initial state, the third elastic member (220) does not apply elastic force to the seat (2) and the seat support portion (3); In the adaptive lumbar support state, the third elastic member (220) applies a thrust to the seat (2) and the seat support portion (3), so that the seat (2) has a tendency to move in a direction away from the seat support portion (3); in the self-loaded reclining state, the third elastic member (220) applies a pulling force to the seat (2) and the seat support portion (3), so that the seat (2) has a tendency to move in a direction close to the seat support portion (3).

17. The dual system seat according to claim 16, characterized in that: The third elastic member (220) is a controllable gas spring. The seat (2) and the third elastic member (220) are connected via a wire control mechanism. The wire control mechanism comprises an adjustment switch (230) and a pull cord connected between the adjustment switch (230) and the third elastic member (220). The adjustment switch (230) is configured to adjust the pull cord to pull or release the ejector pin of the third elastic member (220), thereby enabling the third elastic member (220) to be fixed at any telescopic length.

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