Seat

Abstract

The utility model discloses a seat. The 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; and the seat has a switchable initial state, a self-adaptive waist supporting state and a self-loading tipping state.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of seat, concretely relates to a seat that can switch among multiple forms. BACKGROUND

[0002] Nowadays, people often need to sit for a long time to work or study. During this period, if the sitting posture is not correct, it is easy to cause myopia, scoliosis, lumbar strain and many other diseases, especially for teenagers whose bodies are developing, the problem is particularly serious. In order to make the user maintain a good sitting posture, a recliner chair appears on the market, when the user sits on the recliner chair, the backrest of the recliner chair will automatically translate forward, thereby stably supporting the back of the user, helping the user to correct the sitting posture.

[0003] For example, the prior patent of the applicant provides a seat support and a seat (publication number: CN219661278U), which is composed of a base, a mounting rod, a support rod, a handrail and a connecting rod to form a four-bar linkage mechanism. When the four-bar linkage mechanism acts, the connecting block on the mounting rod rotates forward / backward, and the backrest mounting seat on the handrail translates forward / backward with the handrail. When the connecting block rotates forward, the chair seat connecting frame is driven to descend and move forward. When the connecting block rotates backward, the chair seat connecting frame is driven to rise and move backward. Since the backrest mounting seat translates forward / backward with the handrail, the backrest mounted on the backrest mounting seat translates forward / backward, so that the backrest can keep the human body at the correct support angle.

[0004] However, in the direction of structure optimization, the following deficiencies are found: during use of the seat, the backrest can only keep a vertical posture and move forward / backward. If the user wants to lie on his back to rest after working or studying, the backrest cannot be turned backward to an angle suitable for the user to lie on his back, so that the user cannot lie on his back to rest on the seat. The seat cannot meet the deeper needs of the user, and the practicality is poor. SUMMARY

[0005] In view of the above defects or deficiencies in the prior art, it is desirable to provide a seat that can switch among multiple forms. The backrest, long support rod, rear support and 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 moves the chair seat up and down in parallel. The seat not only has a self-adaptive waist supporting state in which the backrest translates forward in response to the sinking of the chair seat, but also has a self-weighted leaning state in which the backrest leans backward in response to the leaning of the backrest, and the chair seat is lifted upward. The seat can meet the needs of the user for backrest adjustment and leaning adjustment at the same time, and has good practicality.

[0006] The effect of the utility model is achieved as follows:

[0007] The application embodiment provides a seat, which comprises:

[0008] a backrest configured to support a back of the user;

[0009] a seat configured to support a sitting of the user;

[0010] a base, the base being a split structure comprising a seat support part and a backrest support part which are spliced together, a front end of the seat support part and a front end of the backrest support part being hingedly connected to each other, so that the backrest support part can rotate up and down relative to the seat support part;

[0011] a rotating support rod, the rotating support rod being arranged on the left and right sides of the front end of the seat support part, the rotating support rod comprising a short support rod and a long support rod which are inclined to each other and always remain relatively fixed, a lower end of the short support rod and the long support rod being connected to each other at a rotating part, the rotating support rod being hingedly connected 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; an upper end of the long support rod being hingedly connected to the backrest, and an upper end of the short support rod being hingedly connected to the seat, the seat being capable of sliding up and down relative to the seat support part and driving the short support rod to rotate forward and backward around the rotating part;

[0012] a rear support, a lower end of the rear support being hingedly connected to a rear end of the backrest support part, and an upper end of the rear support being hingedly connected to the backrest;

[0013] The seat has an initial state, an adaptive lumbar support state, and a self-weight reclining state. When the seat is in the initial state, the seat is not pressed and is at a higher position, and the backrest is not subjected to a leaning force and remains in an upright state. When the seat is pressed to move downward in the initial state, the seat switches to the adaptive lumbar support state, the short support rod and the long support rod are driven by the seat to swing forward synchronously, the rear support is driven by the long support rod to swing forward synchronously, and the backrest hingedly connected to the upper side of the long support rod and the rear support is driven to translate forward and be ejected. When the backrest is subjected to a leaning force in the initial state, the seat switches to the self-weight reclining state, the backrest support part rotates downward relative to the seat support part, the backrest rotates downward synchronously in response to the backrest support part, and the long support rod and the rear support rotate backward synchronously, so that the backrest on the upper side can recline backward, and the short support rod and the long support rod swing backward synchronously and drive the seat to move upward.

[0014] Further, in the adaptive lumbar support state, the backrest moves in the horizontal direction by a distance of 0-15 cm, and in the self-weight reclining state, the backrest has a reclining angle of 0-30°. In the adaptive lumbar support state, the backrest has a long forward and backward sliding stroke to adapt to the seat depth of users of various body types, and in the self-weight reclining state, the backrest has a large reclining angle to ensure that the user can rest in a comfortable supine position, which is good in practicability.

[0015] Further, the chair seat support part and the backrest support part are provided with a locking device, the locking device has switchable locking state and unlocking state; when the seat is switched to the self-adaptive waist supporting state, the locking device is in the locking state, and the chair seat support part and the backrest support part are relatively fixed; when the seat is switched to the self-weight tilting state, the locking device is in the unlocking state, and the backrest support part can be re-rotated relative to the chair seat support part. By switching the locking state and the unlocking state of the locking device, the switching operation of the seat between the initial state, the self-adaptive waist supporting state and the self-weight tilting state can be realized, and the adjustment operation is relatively simple; and the self-adaptive waist supporting state and the self-weight tilting state do not interfere with each other, so that the stability of the seat is better.

[0016] Further, the front end of the chair seat support part is provided with a first connecting part, the front end of the backrest support part is provided with a second connecting part, the first connecting part is hinged to the second connecting part, the first connecting part is provided with a first limiting hole in the left-right direction, and the second connecting part is provided with a second limiting hole in the left-right direction; the locking device comprises a locking pin, and the locking pin is slidingly connected to the first limiting hole and the second limiting hole; in the locking state, the first limiting hole is communicated with the second limiting hole, the locking pin is slidingly connected to the first limiting hole and the second limiting hole at the same time, so that the second connecting part cannot rotate relative to the first connecting part, and the chair seat support part and the backrest support part are relatively fixed; in the unlocking state, the locking pin slides away from the first limiting hole or the second limiting hole, and the backrest support part can be re-rotated relative to the chair seat support part. By slidingly adjusting the locking pin to simultaneously engage or avoid the first limiting hole and the second limiting hole, the locking state or the unlocking state of the locking device is adjusted, which not only facilitates the adjustment operation, but also simplifies the overall structure and is easy to set.

[0017] Further, the front end of the backrest support part is provided with two second connecting parts which are symmetrical in the left-right direction, the two second connecting parts are hinged to the left and right sides of the first connecting part, and the rotating parts on the two sides are respectively hinged to the two second connecting parts; the locking device further comprises a pressing part, and the pressing part is arranged on one side of the rotating part close to the second connecting part; in the self-adaptive waist supporting state, the rotating part rotates forward, the pressing part rotates and pushes the locking pin inward at the same time, so that the locking pin slides inward to simultaneously engage in the first limiting hole and the second limiting hole, the locking device enters the locking state, and the chair seat support part and the backrest support part are relatively fixed; in the self-weight tilting state, the rotating part rotates backward, the pressing part rotates and avoids the locking pin at the same time, so that the locking pin slides outward to be separated from the first limiting hole, the locking device enters the unlocking state, and the backrest support part can be re-rotated downward relative to the chair seat support part. When the seat is switched from the initial state to the self-adaptive waist supporting state or the self-weight tilting state, the locking device can automatically switch the locking state or the unlocking state with the rotation of the rotating part, which effectively improves the convenience of the state switching operation of the seat.

[0018] Further, the first elastic member is arranged in the second limiting hole and acts on the locking pin, so that the locking pin always has a tendency to move away from the first connecting portion. When the seat is directly switched from the initial state to the self-weight tilting state, the locking pin is automatically pushed out by the elastic force of the first elastic member and separated from the first limiting hole, so that the locking device is automatically switched to the unlocked state, further improving the convenience of the state switching operation of the seat.

[0019] Further, the end face of the extrusion portion close to the locking pin and / or the end face of the locking pin close to the extrusion portion is arranged to be inclined, so that when the rotating portion drives the extrusion portion to move in a circular motion and push the locking pin, the locking pin can slide along the inclined direction of the end face towards the first connecting portion. By arranging the end faces of the extrusion portion and / or the locking pin close to each other to be inclined, the structure is simple, and the circular motion of the extrusion portion can be converted into the sliding of the locking pin in the horizontal direction.

[0020] Further, the second elastic member is arranged 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 towards the seat support portion. When the seat is switched from the self-weight tilting state back to the initial state, the backrest support portion is automatically rotated upward under the elastic force of the second elastic member, and in turn drives the upper backrest to reset to the initial state, thereby improving the convenience of the state switching operation of the seat.

[0021] Further, the backrest support portion includes a sliding support portion formed by extending the rear end backward and a sliding member slidingly connected to the sliding support portion in the front-rear direction, and the bottom end of the rear support is hinged to the sliding member. In the self-weight tilting state, the sliding member is pressed by the rear support and slides forward, and the bottom end of the rear support is driven by the sliding member and slides forward, so that the top end of the rear support rotates backward, and the backrest hinged to the top end of the rear support further tilts backward. The backrest as a whole can tilt backward to a larger angle, not only allowing the user to lie on the seat in a more comfortable posture, but also allowing the backrest to rotate to a larger angle as the seat is lifted, so that the user's back is not rubbed, and the use experience is more comfortable.

[0022] Further, the sliding support portion is fixedly connected with a gear adjusting member, and a gear adjusting mechanism is arranged between the sliding member and the gear adjusting member. The gear adjusting mechanism includes a clamping head and a plurality of gear slots, and the clamping head is arranged in one of the sliding member and the gear adjusting member, and the plurality of gear slots are arranged in the other one of the sliding member and the gear adjusting member. When the sliding member slides forward and backward relative to the gear adjusting member, the clamping head is sequentially engaged with the plurality of gear slots. The sliding member can be fixed at any position on the sliding support portion, and in turn the backrest can adjust and fix the tilting angle by means of the gear adjusting mechanism, which is more convenient to use.

[0023] Further, the clamping head is movably connected to the gear adjusting member, and the sliding member is correspondingly provided with a plurality of gear grooves. The gear adjusting member has a switchable fixed state and sliding state. In the fixed state, the clamping head is slid outward to be clamped in the gear grooves, so that the sliding member and the gear adjusting member are relatively fixed. In the sliding state, the clamping head is slid inward to be retracted into the gear adjusting member and avoid the gear grooves, so that the sliding member can slide relative to the gear adjusting member again. By means of the movement of the clamping head to clamp or avoid the gear grooves, the movement or fixation between the sliding member and the sliding support part is realized, which is convenient to operate and makes the gear adjusting operation more simple.

[0024] Further, the sliding member is a plate structure, and the sliding member is hollowed out to form a first sliding support groove extending in the front-rear direction. The sliding member is movably connected to the gear adjusting member, and the gear adjusting member protrudes to form a limiting part. The limiting part passes through the first sliding support groove and is connected to the sliding support part, so that the sliding member is clamped between the sliding support part and the gear adjusting member, and the sliding member slides relative to the limiting part through the first sliding support groove. Not only the connection strength between the sliding member and the sliding support part is higher, but also the sliding process of the sliding member is more stable and smooth.

[0025] Further, the lower end of the seat is provided with two bottom disc connecting parts symmetrical left and right. The two bottom disc connecting parts are attached to the left and right sides of the seat support part. The bottom disc connecting part and the seat support part are connected through a guide mechanism. The guide mechanism includes a guide slot and a guide pin that slide relative to each other. The guide slot is provided in one of the bottom disc connecting part and the seat support part, and the guide pin is provided in the other one. By means of the sliding of the guide pin in the guide slot, 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.

[0026] Further, the guide slot includes a lumbar support guide part and a reclining guide part. Both the lumbar support guide part and the reclining guide part are inclinedly arranged, and the inclination direction is from front to back and from low to high. The inclination of the lumbar support guide part is greater than that of the reclining guide part. By incliningly arranging the guide slot, the position of the seat in the horizontal direction will also change when the seat slides up and down. The inclination of the lumbar support guide part is greater than that of the reclining guide part, so that in the self-adaptive lumbar support state, the change of the seat in the horizontal direction is small, avoiding affecting the seat depth adjustment. In the self-weight reclining state, the seat will move a longer distance in the horizontal direction, so as to adapt to the change of the position of the human hip when the backrest is reclined, and the support experience is more comfortable.

[0027] Further, the short supporting rod is hinged to the front end of the seat, the bottom plate connecting part is arranged at the rear end of the seat, and the guide groove is arranged in the bottom plate connecting part. The seat can be just above the base, and the position is more reasonable. By arranging the guide groove in the bottom plate connecting part, the processing is easy, and the combination of the seat supporting part and the back supporting part will not be affected.

[0028] Further, the third elastic member is arranged between the seat and the seat supporting part. In the initial state, the third elastic member does not exert elastic force on the seat and the seat supporting part. In the self-adaptive lumbar supporting state, the third elastic member exerts a pushing force on the seat and the seat supporting part, so that the seat has a tendency to move away from the seat supporting part. In the self-weight tilting state, the third elastic member exerts a pulling force on the seat and the seat supporting part, so that the seat has a tendency to move towards the seat supporting part. The seat can be automatically reset, and the rotating supporting rod, the back supporting part, the rear support and the back are moved by the seat, so that the seat is reset to the initial state without manual reset of the user, further improving the convenience of the state switching operation of the seat.

[0029] Further, the third elastic member is a controllable gas spring, and the seat and the third elastic member are connected through a wire control mechanism. The wire control mechanism includes an adjusting switch and a pull rope connected between the adjusting switch and the third elastic member. The adjusting switch is configured to adjust the pull rope to pull or loosen the plunger of the third elastic member, so that the third elastic member can be fixed at any extension length. Only the adjusting switch needs to be pressed to adjust the extension or fixation of the third elastic member, and the back is moved or fixed. The adjusting operation is very simple.

[0030] The seat provided by the application comprises a back, a long supporting rod, a rear support and a back supporting part which are hinged to each other to form a parallel four-bar structure. The long supporting rod drives the short supporting rod to rotate and moves the seat up and down in linkage, so that the seat not only has a self-adaptive lumbar supporting state in which the back moves forward in translation in response to the sinking of the seat, but also has a self-weight tilting state in which the back tilts backward in response to the lifting of the seat, so as to meet the needs of the user for back adjustment and tilting adjustment at the same time, and the utility is good.

[0031] Moreover, by setting the chassis as a split structure, the chair seat support part and the backrest support part are adjusted and locked by the locking device, in the locked state of the locking device, the long supporting rod and the rear support can only swing forward and backward, thereby driving the backrest to translate forward and backward; in the unlocked state of the locking device, the backrest support part can rotate downward relative to the chair seat support part, thereby driving the upper backrest to rotate downward; thus, by switching the locked state and the unlocked state of the locking device, the switching operation of the seat between the initial state, the self-adaptive waist supporting state and the self-weight tilting state can be realized, and the adjustment operation is relatively simple; and in the self-adaptive waist supporting state, the backrest cannot be tilted, which will not affect the backrest adjustment; similarly, in the self-weight tilting state, the backrest cannot be adjusted to translate forward, thereby not affecting the tilting adjustment of the backrest; that is, the self-adaptive waist supporting state and the self-weight tilting state do not interfere with each other, so that the stability of the seat is good. BRIEF DESCRIPTION OF DRAWINGS

[0032] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the drawings:

[0033] Figure 1 A perspective structural schematic view of the seat provided by the embodiments of the application is shown in the figure;

[0034] Figure 2 A bottom structural schematic view of the seat provided by the embodiments of the application is shown in the figure;

[0035] Figure 3 A side structural schematic view of the seat in the initial state provided by the embodiments of the application is shown in the figure;

[0036] Figure 4 A side structural schematic view of the seat in the self-adaptive waist supporting state provided by the embodiments of the application is shown in the figure;

[0037] Figure 5 A side structural schematic view of the seat in the self-weight tilting state provided by the embodiments of the application is shown in the figure;

[0038] Figure 6 A change process schematic view of the seat when changing from the initial state to the self-adaptive waist supporting state provided by the embodiments of the application is shown in the figure;

[0039] Figure 7 A change process schematic view of the seat when changing from the initial state to the self-weight tilting state provided by the embodiments of the application is shown in the figure;

[0040] Figure 8 A cross-sectional structural schematic view of the seat provided by the embodiments of the application is shown in the figure;

[0041] Figure 9 A connecting structural schematic view between the chair seat and the chassis provided by the embodiments of the application is shown in the figure;

[0042] Figure 10 A connection structure between the seat support part and the back support part according to an embodiment of the present application is shown in the following figure;

[0043] Figure 11 A cross-sectional structure of the chassis in the unlocked state according to an embodiment of the present application is shown in the following figure;

[0044] Figure 12 A cross-sectional structure of the chassis in the locked state according to an embodiment of the present application is shown in the following figure;

[0045] Figure 13 A three-dimensional structure of the chassis and the rear support in the locked state according to an embodiment of the present application is shown in the following figure;

[0046] Figure 14 A three-dimensional structure of the chassis and the rear support in the unlocked state according to an embodiment of the present application is shown in the following figure;

[0047] Figure 15 A connection structure between the chassis and the rear support according to an embodiment of the present application is shown in the following figure;

[0048] Figure 16 An internal structure of the gear adjusting mechanism according to an embodiment of the present application is shown in the following figure;

[0049] Figure 17 A connection structure between the gear adjusting member and the sliding member in the fixed state according to an embodiment of the present application is shown in the following figure;

[0050] Figure 18 A connection structure between the gear adjusting member and the sliding member in the sliding state according to an embodiment of the present application is shown in the following figure.

[0051] The reference signs are as follows: 1 - backrest, 110 - armrest part, 120 - armrest, 2 - seat, 210 - chassis connecting part, 211 - guide slot, 211a - lumbar support guide part, 211b - reclining guide part, 220 - third elastic member, 230 - adjusting switch, 3 - seat support part, 301 - guide pin, 310 - first connecting part, 311 - first limiting hole, 320 - transmission member, 4 - back support part, 401 - locking pin, 402 - first elastic member, 403 - second elastic member, 410 - 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 adjusting member, 441 - clamping head, 442 - limiting part, 443 - accommodating cavity, 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 support. DETAILED DESCRIPTION

[0052] The application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and not limit the utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings.

[0053] Please refer to the accompanying drawings Figures 1-18 The embodiment of the application provides a kind of seat, comprising:

[0054] Backrest 1 is configured to support the back of user;

[0055] Chair seat 2 is configured to support user sitting;

[0056] Base, base is split structure, including upper and lower spliced chair seat support part 3 and backrest support part 4, the front end of chair seat support part 3 and the front end of backrest support part 4 are hinged to each other, so that backrest support part 4 can rotate up and down relative to chair seat support part 3;

[0057] Rotary support rod 5, rotary support rod 5 is set to the left and right sides of the front end of chair seat support part 3, rotary support rod 5 includes mutually inclined and always keeps relatively fixed short branch 510 and long branch 520, the lower end of short branch 510 and long branch 520 meets the part of junction as rotating part 530, rotary support rod 5 is hinged to chair seat support part 3 through rotating part 530, so that rotary support rod 5 can rotate around rotating part 530 synchronously as a whole;The upper end of long branch 520 is hinged to backrest 1, and the upper end of short branch 510 is hinged to chair seat 2, chair seat 2 can slide up and down relative to chair seat support part 3, and drive short branch 510 to rotate forward and backward around rotating part 530;

[0058] Rear support 6, the lower end of rear support 6 is hinged to the rear end of backrest support part 4, and the upper end of rear support 6 is connected to backrest 1;

[0059] The seat has an initial state, an adaptive lumbar support state and a self-weight reclining state. When the seat is in the initial state, the seat cushion 2 is not pressed and is at a high position, and the backrest 1 is not pressed and is in an upright state. When the seat cushion 2 is pressed to move downward in the initial state, the seat switches to the adaptive lumbar support state, the short support rod 510 and the long support rod 520 are driven to swing forward synchronously by the seat cushion 2, the rear support 6 swings forward synchronously in response to the long support rod 520, and the backrest 1 connected to the upper side of the long support rod 520 and the rear support 6 is driven to move forward and be ejected. When the backrest 1 is pressed to recline in the initial state, the seat switches to the self-weight reclining state, the backrest support 4 rotates downward relative to the seat support 3, the backrest 1 rotates downward synchronously in response to the backrest support 4, and the long support rod 520 and the rear support 6 rotate backward synchronously, so that the backrest 1 on the upper side can recline backward, and the short support rod 510 and the long support rod 520 swing backward synchronously and drive the seat cushion 2 to move upward.

[0060] In the embodiment, the backrest 1, the long support rod 520, the rear support 6 and the backrest support 4 are connected to each other to form a parallel four-bar linkage structure, the long support rod 520 drives the short support rod 510 to rotate and drives the seat cushion 2 to move up and down, so that the seat not only has the adaptive lumbar support state in which the backrest 1 moves forward to follow the seat cushion 2, but also has the self-weight reclining state in which the backrest 1 reclines backward and the seat cushion 2 moves upward, and can meet the needs of the user for back following adjustment and reclining adjustment at the same time, and has good practicability.

[0061] Preferably, the left and right ends of the backrest 1 extend forward to form handrail parts 110, and the top ends of the long support rods 520 are connected to the handrail parts 110. The handrail parts 110 are hollow sleeve structures in the vertical direction, and the left and right handrail parts 110 are sleeved with handrails 120, so that the handrails 120 can move with the backrest 1 in the adaptive lumbar support state or the self-weight reclining state, and the handrails 120 can always be kept at a position for supporting the hands of the user, without the need for monotonous adjustment, and the use experience is more comfortable and convenient. Furthermore, the handrails 120 are connected to the handrail parts 110 by a handrail height mechanism, so that the handrails 120 can slide up and down to adjust the height, and the practicability is better. The handrail height mechanism is a common mechanism in existing seats, and will not be described in detail herein.

[0062] Please refer to the accompanying drawings Figures 6-7 In some embodiments of the present application, the moving distance of the backrest 1 in the horizontal direction in the adaptive lumbar support state is 0-15 cm, and the reclining angle of the backrest 1 in the self-weight reclining state is 0-30°. In the adaptive lumbar support state, the backrest 1 has a long forward and backward sliding stroke to adapt to seat depths of users of various body types, and in the self-weight reclining state, the backrest 1 has a large reclining angle to ensure that the user can rest in a comfortable reclining position, and the practicability is good.

[0063] Please refer to the attached drawings Figures 9-12 In some embodiments of the present application, a locking device is arranged between the seat support part 3 and the back support part 4, and the locking device has a switchable locked state and an unlocked state; when the seat is switched to the self-adaptive lumbar support state, the locking device is in the locked state, and the seat support part 3 and the back support part 4 are relatively fixed; when the seat is switched to the self-weight tilting state, the locking device is in the unlocked state, and the back support part 4 can be re-rotated relative to the seat support part 3.

[0064] In the present embodiment, the seat support part 3 and the back support part 4 are adjusted and locked or moved by the locking device; in the locked state of the locking device, the long supporting rod 520 and the rear support 6 can only swing forward and backward, thereby driving the backrest 1 to translate forward and backward; in the unlocked state of the locking device, the back support part 4 can be rotated downward relative to the seat support part 3, thereby driving the upper backrest 1 to rotate downward together; thus, by switching the locked state and the unlocked state of the locking device, the seat can be switched between the initial state, the self-adaptive lumbar support state and the self-weight tilting state, and the adjustment operation is relatively simple; and in the self-adaptive lumbar support state, the backrest 1 cannot be tilted, which does not affect the back adjustment of the backrest 1; similarly, in the self-weight tilting state, the backrest 1 cannot be adjusted to translate forward, thereby not affecting the tilting adjustment of the backrest 1; that is, the self-adaptive lumbar support state and the self-weight tilting state do not interfere with each other, so that the stability of the seat is better.

[0065] Of course, in other embodiments of the present application, the locking device can not be arranged between the seat support part 3 and the back support part 4, and only the user applies pressure to one of the seat 2 and the backrest 1 to realize the switching operation of the seat between the initial state, the self-adaptive lumbar support state and the self-weight tilting state, without the need for further locking operation, and the adjustment operation is more simple.

[0066] Please refer to the attached drawings Figures 9-12In some embodiments of the present application, the front end of the seat support part 3 is provided with a first connecting part 310, the front end of the back support part 4 is provided with a second connecting part 410, the first connecting part 310 is hinged to the second connecting part 410, a first limiting hole 311 is hollowed out on the first connecting part 310 in the left-right direction, and a second limiting hole 411 is hollowed out on the second connecting part 410 in the left-right direction; the locking device comprises a locking pin 401 which is slidingly connected to the first limiting hole 311 and the second limiting hole 411; in the locked state, the first limiting hole 311 is communicated with the second limiting hole 411, the locking pin 401 slides to be simultaneously clamped 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 back 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 back support part 4 can be re-rotated relative to the seat support part 3.

[0067] In the present embodiment, the locking device is adjusted to switch between the locked state and the unlocked state by sliding the locking pin 401 to simultaneously clamp or avoid the first limiting hole 311 and the second limiting hole 411, which not only facilitates the adjustment operation, but also simplifies the overall structure and is easy to set.

[0068] Among them, the back support part 4 and the seat support part 3 are both half-open box-shaped structures, in the locked state, the seat support part 3 and the back support part 4 are closed to each other to form a complete base, so that the structure of the base is more compact, and the back support part 4 can rotate a larger angle relative to the seat support part 3.

[0069] Please refer to the accompanying drawings Figures 9-12 In some embodiments of the present application, the front end of the back support part 4 is provided with two second connecting parts 410 which are symmetrical in left and right directions, the two second connecting parts 410 are hinged to the left and right sides of the first connecting part 310, and the rotating parts 530 on both sides are hinged to the two second connecting parts 410 respectively; the locking device further comprises a pressing part 531 which is arranged on one side of the rotating part 530 close to the second connecting part 410; in the self-adaptive lumbar support state, the rotating part 530 rotates forward, the pressing part 531 rotates and pushes the locking pin 401 inward at the same time, so that the locking pin 401 slides inward to be simultaneously clamped in the first limiting hole 311 and the second limiting hole 411, the locking device enters the locked state, and the seat support part 3 and the back support part 4 are relatively fixed; in the self-weight reclining state, the rotating part 530 rotates backward, the pressing part 531 rotates and avoids the locking pin 401 at the same time, so that the locking pin 401 slides outward to be separated from the first limiting hole 311, the locking device enters the unlocked state, and the back support part 4 can be re-rotated downward relative to the seat support part 3.

[0070] In the embodiment, by arranging the extrusion part 531 on the rotating part 530, the extrusion part 531 performs circumferential movement along with the rotation of the rotating part 530 and pushes or avoids the locking pin 401, so that when the seat is switched from the initial state to the self-adaptive back supporting state or the self-weight leaning state, the locking device can automatically switch the locking state or the unlocking state along with the rotation of the rotating part 530, without manual adjustment by the user, thereby effectively improving the convenience of the seat state switching operation. In addition, the front end of the back support part 4 is provided with two second connecting parts 410 which are symmetrical left and right, and the two rotating parts 530 are connected to the second connecting parts 410 on the two sides respectively, so that the chair seat support part 3 and the back support part 4 are limited by the two groups of locking pins 401, and along with the rotation of the rotating rods 5 on the two sides of the seat, the two groups of locking pins 401 are simultaneously driven to slide, so that the locking or unlocking operation between the chair seat support part 3 and the back support part 4 is more stable.

[0071] Please refer to the accompanying drawings Figures 11-12 In some embodiments of the present application, the first elastic member 402 is arranged in the second limiting hole 411, and the first elastic member 402 acts on the locking pin 401 and makes the locking pin 401 always have a tendency to move away from the first connecting part 310.

[0072] In the embodiment, when the seat is directly switched from the initial state to the self-weight leaning state, when the rotating part 530 rotates to the extrusion part 531 avoiding the locking pin 401, the locking pin 401 can automatically pop out outwardly by the elastic force of the first elastic member 402 and is separated from the first limiting hole 311, so that the locking device can automatically switch to the unlocking state, and the seat can automatically enter the self-adaptive back supporting state, thereby further improving the convenience of the seat state switching operation.

[0073] Preferably, the first elastic member 402 is a spring, and the locking pin 401 is in a T-shaped structure as a whole, and the side with a larger width of the locking pin 401 is close to the extrusion part 531, and the spring is sleeved on the slender side of the locking pin 401 and extrudes the locking pin 401 outwardly, which is simple in structure and easy to arrange.

[0074] Please refer to the accompanying drawings Figures 9-10 In some embodiments of the present application, the end face of the extrusion part 531 close to the locking pin 401 and / or the end face of the locking pin 401 close to the extrusion part 531 is arranged to be inclined, so that when the rotating part 530 drives the extrusion part 531 to perform circumferential movement and push the locking pin 401, the locking pin 401 can slide along the inclined direction of the end face towards the first connecting part 310.

[0075] In the embodiment, by arranging the end faces of the extrusion part 531 and / or the locking pin 401 close to each other to be inclined, the structure is simple, and the circumferential rotation of the extrusion part 531 can be converted into the sliding of the locking pin 401 in the horizontal direction.

[0076] Preferably, the end face of the extrusion part 531 close to the locking pin 401 and the end face of the locking pin 401 close to the extrusion part 531 are both inclined, so that the transmission between the two is more stable and smooth.

[0077] Please refer to the accompanying drawings Figure 10 In some embodiments of the present application, a second elastic member 403 is arranged between the seat support part 3 and the back support part 4, and the two ends of the second elastic member 403 act on the seat support part 3 and the back support part 4 respectively, so that the back support part 4 always has a tendency to rotate towards the seat support part 3.

[0078] In the present embodiment, by arranging the second elastic member 403 between the seat support part 3 and the back support part 4, when the seat is switched from the self-weight reclining state back to the initial state, the back support part 4 will automatically rotate upward under the elastic force of the second elastic member 403, and in turn drive the upper backrest 1 to rotate forward to the vertical state, so as to reset to the initial state, and the user does not need to manually rotate the backrest 1 to reset, thereby improving the convenience of the seat state switching operation.

[0079] Please refer to the accompanying drawings Figures 13-14 In some embodiments of the present application, the back support part 4 includes a sliding support part 420 formed by extending the rear end backward and a sliding member 430 slidingly connected to the sliding support part 420 along the front-back direction, and the bottom end of the rear support 6 is hinged to the sliding member 430; in the self-weight reclining state, the sliding member 430 is pressed by the rear support 6 and slides forward, and the bottom end of the rear support 6 is driven by the sliding member 430 and slides forward, so that the top end of the rear support 6 rotates backward, and in turn drives the backrest 1 hinged to the top end of the rear support 6 to further recline backward.

[0080] In the present embodiment, if the backrest 1 is only driven to recline by the rotation of the back support part 4, since the angle that the back support part 4 can rotate is small, the angle that the backrest 1 can rotate is also small, which makes the user unable to lie on the seat, and cannot meet the demand; and since the seat 2 will move upward synchronously with the backward reclining of the backrest 1, if the backrest 1 cannot rotate a larger angle during the reclining process, the backrest 1 will rub the back of the user as the seat 2 is lifted, and the user experience is poor. Therefore, by hinging the bottom end of the rear support 6 to the sliding member 430 which can slide forward and backward, in the self-weight reclining state, in addition to the backward reclining of the backrest 1 by the rotation of the back support part 4, the rear support 6 rotates backward as a whole by the forward movement of the sliding member 430, and in turn drives the upper backrest 1 to further recline backward, so that the backrest 1 can recline a larger angle as a whole, not only making the user be able to lie on the seat in a more comfortable posture, but also making the backrest 1 rotate a larger angle as the seat 2 is lifted, so that the backrest 1 will not rub the back of the user, and the user experience is more comfortable.

[0081] The transmission member 320 is hingedly connected to the rear end of the seat support part 3 and to the sliding member 430. The seat support part 3, the back support part 4, the sliding member 430 and the transmission member 320 form a structure similar to a three-link sliding groove. When the back support part 4 is turned downward, the sliding member 430 is forced to slide forward under the restriction of the transmission member 320. When the back support part 4 is turned upward, the sliding member 430 is forced to slide backward under the restriction of the transmission member 320. Thus, the movement of the sliding member 430 is further restricted by the transmission member 320, and the movement of the sliding member 430 is more stable and smooth.

[0082] Please refer to the accompanying drawings Figures 15-18 In some embodiments of the present application, the sliding support part 420 is fixedly connected with a gear adjusting member 440, and a gear adjusting mechanism is arranged between the sliding member 430 and the gear adjusting member 440. The gear adjusting mechanism includes a clamping head 441 and a plurality of gear slots 431. The clamping head 441 is arranged in one of the sliding member 430 and the gear adjusting member 440, and the plurality of gear slots 431 are arranged in the other of the sliding member 430 and the gear adjusting member 440. When the sliding member 430 slides forward and backward relative to the gear adjusting member 440, the clamping head 441 is sequentially engaged with the plurality of gear slots 431.

[0083] In the present embodiment, the gear adjusting mechanism is arranged between the sliding member 430 and the gear adjusting member 440 by means of the clamping head 441 and the gear slots 431, so that the sliding member 430 can be fixed at any position on the sliding support part 420, and the backrest 1 can be adjusted and fixed in the pitch angle by means of the gear adjusting mechanism, which is more convenient to use.

[0084] Please refer to the accompanying drawings Figures 15-18 In some embodiments of the present application, the clamping head 441 is movably connected to the gear adjusting member 440, and the sliding member 430 is correspondingly provided with a plurality of gear slots 431. The gear adjusting mechanism has a switchable fixed state and sliding state. In the fixed state, the clamping head 441 slides outward to be engaged with the gear slots 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 to be retracted into the gear adjusting member 440 and to avoid the gear slots 431, so that the sliding member 430 can slide relative to the gear adjusting member 440.

[0085] In the present embodiment, the clamping head 441 is movably arranged in the gear adjusting member 440, and the gear slots 431 are engaged 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 convenient to operate and makes the gear adjusting operation more simple.

[0086] Wherein, please refer to the attached Figures 17-18 The sliding member 430 is a plate structure, the bottom end of the sliding member 430 is concave upward to form a second sliding support groove 433 extending along the length direction, the gear adjusting member 440 is arranged in the second sliding support groove 433, and the sliding member 430 slides forward and backward relative to the gear adjusting 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 adjusting member 440 are provided with clamping heads 441, and the left and right side walls of the second sliding support groove 443 are correspondingly provided with gear grooves 431. The gear adjusting member 440 is a hollow structure, including an internal containing cavity 443, one end of the left and right clamping heads 441 passes through the side wall of the gear adjusting member 440 and extends into the containing cavity 443, the containing cavity 443 is provided with two symmetrical torsional springs 444, one side of the two torsional springs 444 is connected to the clamping heads 441 on the two sides, and the other side of the two torsional springs 444 is connected to a push-pull member 445; the push-pull member 445 can slide forward and backward in the containing cavity 443, and drives the torsional springs 444 to pull or push the clamping heads 441 inward. The chair seat 2 is also provided with a wire control mechanism, including an adjusting switch 230 arranged on the chair seat 2 and a pull rope, one end of the pull rope is connected to the adjusting switch 230, the other end passes through the gear adjusting member 440 and is connected to the push-pull member 445, when the adjusting switch 230 is turned on, the pull rope pulls the push-pull member 445 to slide forward, and drives the torsional springs 444 to pull the clamping heads 441 inward, so that the sliding member 430 can slide relative to the gear adjusting member 440 again; the rear end of the push-pull member 445 is also connected with a fourth elastic member 446, 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 when the adjusting switch 230 is turned off, the pull rope loosens the push-pull member 445, the push-pull member 445 is automatically reset to slide backward under the elastic force of the fourth elastic member 446, and drives the torsional springs 444 to push the clamping heads 441 outward, so that the clamping heads 441 are re-clamped into the gear grooves 431, and the sliding member 430 is re-fixed on the gear adjusting member 440. Therefore, the locking and unlocking of the gear adjusting mechanism can be controlled by means of the wire control mechanism, and the operation is relatively simple.

[0087] Preferably, along the length direction, four rows of gear grooves 431 are arranged on the sliding member 430, so that the gear adjusting mechanism has four gears adjustable gears, and the adjustment degree of freedom is higher. Of course, in other embodiments of the present application, the number of gear grooves 431 on the sliding member 430 can also be three rows, five rows, six rows, etc.

[0088] Please refer to the attached Figure 15In some embodiments of the present application, the sliding piece 430 is a plate-shaped structure, and a first sliding support groove 432 extending in the front-rear direction is hollowed out on the sliding piece 430. A gear adjusting piece 440 is slidingly connected to the sliding piece 430, and a limiting portion 442 is protruded on the gear adjusting piece 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 piece 430 is clamped between the sliding support portion 420 and the gear adjusting piece 440, and the sliding piece 430 slides forward and backward relative to the limiting portion 442 through the first sliding support groove 432.

[0089] In the present embodiment, the sliding piece 430 is clamped by the sliding support portion 420 and the gear adjusting piece 440, and the sliding distance of the sliding piece 430 is limited by the limiting portion 442 and the first sliding support groove 432, which not only makes the connection between the sliding piece 430 and the sliding support portion 420 stronger, but also makes the sliding process of the sliding piece 430 more stable and smooth.

[0090] Preferably, two limiting portions 442 that are left-right symmetrical are protruded on the gear adjusting piece 440, and two first sliding support grooves 432 are hollowed out on the sliding piece 430 correspondingly. This further improves the connection strength between the sliding piece 430 and the gear adjusting piece 440. After the limiting portion 442 passes through the first sliding support groove 432, the gear adjusting piece 440 and the sliding support portion 420 are fixed by screw connection, so that the sliding piece 430, the gear adjusting piece 440 and the sliding support portion 420 are detachably arranged with each other, making the installation and disassembly operation of the chassis more convenient.

[0091] Please refer to the accompanying drawings Figures 2-4 In some embodiments of the present application, the lower end of the seat 2 is provided with two bottom plate connecting portions 210 that are left-right symmetrical, and the two bottom plate connecting portions 210 are attached to the left and right sides of the seat support portion 3. The bottom plate connecting portion 210 and the seat support portion 3 are connected by a guide mechanism, which includes a guide slot 211 and a guide pin 301 that slidingly fit with each other. The guide slot 211 is provided on one of the bottom plate connecting portion 210 and the seat support portion 3, and the guide pin 301 is provided on the other one.

[0092] In the present embodiment, the guide structure is provided between the bottom plate connecting portion 210 and the seat support portion 3, so that a structure similar to a three-link-sluice is formed between the seat 2, the short support rod 510, the seat support portion 3 and the guide slot 211. By means of the sliding of the guide pin 301 in the guide slot 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, which is simple in structure and makes the transmission process between the seat 2 and the short support rod 510 more stable and smooth.

[0093] Of course, in other embodiments of the present application, transmission between the seat 2, the short link 510 and the seat support part 3 can also be achieved through other mechanisms, for example, another auxiliary link is hinged between the seat 2 and the seat support part 3, so that the auxiliary link, the seat 2, the short link 510 and the seat support part 3 form a mechanism similar to a four-bar linkage, so that when the seat 2 slides up and down relative to the seat support part 3, the short link 510 and the auxiliary link can be driven to rotate forward and backward together.

[0094] Please refer to the accompanying drawings Figures 2-4 In some embodiments of the present application, the guide groove 211 includes a lumbar support guide part 211a and a reclining guide part 211b, both of which are inclinedly arranged, the inclination direction is from front to back and from low to high, and the inclination of the lumbar support guide part 211a is greater than that of the reclining guide part 211b.

[0095] In the present embodiment, by incliningly arranging the guide groove 211, when the seat 2 slides up and down, its position in the horizontal direction will also change, and the inclination of the lumbar support guide part 211a is greater than that of the reclining guide part 211b, so that in the self-adaptive lumbar support state, the seat 2 changes less in the horizontal direction, avoiding affecting the seat depth adjustment; in the self-weight 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 hip when the backrest 1 reclines, and supporting experience is more comfortable.

[0096] Please refer to the accompanying drawings Figures 1-2 In some embodiments of the present application, the short link 510 is hinged to the front end of the seat 2, the chassis connecting part 210 is arranged at the rear end of the seat 2, and the guide groove 211 is opened in the chassis connecting part 210.

[0097] In the present embodiment, the rotating link 5 is hinged to the front side of the base, the short link 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, 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 be affected by the combination of the seat support part 3 and the backrest support part 4.

[0098] In other embodiments of the present application, if the rotating link 5 is connected to the rear side of the base, the short link 510 can be hinged to the rear end of the seat 2, and the chassis connecting part 210 is arranged at the front end of the seat 2. Moreover, the guide groove 211 can also be opened in the seat support part 3.

[0099] Please refer to the accompanying drawings Figures 8-9In some embodiments of the present application, a third elastic member 220 is arranged between the seat 2 and the seat support 3. In the initial state, the third elastic member 220 does not exert elastic force on the seat 2 and the seat support 3. In the self-adaptive lumbar support state, the third elastic member 220 exerts a pushing force on the seat 2 and the seat support 3, so that the seat 2 has a tendency to move away from the seat support 3. In the self-weight reclining state, the third elastic member 220 exerts a pulling force on the seat 2 and the seat support 3, so that the seat 2 has a tendency to move towards the seat support 3. When the user does not use the seat or needs to switch the state again, the seat 2 can be automatically reset by the elastic force of the third elastic member 220, and the rotating rod 5, the back support 4, the rear bracket 6 and the backrest 1 are moved by the seat 2, so that the seat is reset to the initial state without manual reset by the user, further improving the convenience of the state switching operation of the seat.

[0100] Please refer to the accompanying drawings Figures 1-8 In some embodiments of the present application, the third elastic member 220 is a controllable gas spring, and the seat 2 and the third elastic member 220 are connected through a wire control mechanism. The wire control mechanism includes an adjusting switch 230 and a pull rope connected between the adjusting switch 230 and the third elastic member 220. The adjusting switch 230 is configured to adjust the pull rope to pull or release the thimble of the third elastic member 220, so that the third elastic member 220 can be fixed at any extension length.

[0101] In the present embodiment, by using the controllable gas spring, elastic force can be applied to the seat 2, and the seat 2 can be fixed at any extension length, so that the position of the seat 2 is fixed, the short rod 510 cannot rotate due to the limitation of the seat 2, and the long rod 520 is also fixed, so that the front and rear positions of the backrest 1 are fixed. Moreover, the third elastic member 220 is controlled by the wire control mechanism, and the third elastic member 220 can be adjusted in extension or fixation by pressing the adjusting switch 230, so that the adjusting operation is very simple.

[0102] Wherein, 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 opening the adjustment switch 230, the third elastic member 220 can be retracted and extended, the backrest 1 can be translated forward and backward, and the push-pull member 445 pulls down the torsion spring 444 and drives the clamping head 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; when closing the adjustment switch 230, the length of the third elastic member 220 is fixed, the position of the backrest 1 is fixed, and the push-pull member 445 releases the torsion spring 444 and drives the clamping head 441 to pop out, the position of the sliding member 430 is fixed and the backrest 1 cannot be adjusted to rotate the reclining angle, so that the backrest 1 as a whole remains fixed. Therefore, by pressing the adjustment switch 230, the fixation or movement of the backrest 1 as a whole can be controlled, and the convenience of the adjustment operation of the seat is further improved.

Claims

1. A seating arrangement, characterized in that, include: Backrest (1), configured to support the user's back; The seat (2) is configured to support the user when seated; The base is a split structure, including a seat support (3) and a back support (4) that are spliced ​​together. The front end of the seat support (3) and the front end of the back support (4) are hinged to each other, so that the back support (4) can rotate up and down relative to the seat support (3). A rotating support rod (5) is provided 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) that 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 is the 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) 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 back and forth around the rotating part (530). The rear support (6) is hinged at the rear end of the backrest support (4) and at the upper end of the rear support (6) is hinged to the backrest (1). The seating has a switchable initial state, an adaptive lumbar support state, and a self-weight reclining state. In the initial state, the seat (2) is not compressed and is in a high position, and the backrest (1) is not subjected to reclining force and remains upright. In the initial state, when the seat (2) is compressed and moves downward, the seating 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. The rear support (6) responds to the long support rod (520) to swing forward synchronously, thereby causing the hinges between the long support rod (520) and the rear support to swing forward synchronously. (6) The upper backrest (1) is moved forward and pushed out; in the initial state, when the backrest (1) is subjected to a reclining force, the seat switches to a self-weight reclining state, the backrest support (4) rotates downward relative to the seat support (3), the backrest (1) responds to the backrest support (4) and rotates downward synchronously, and the long support rod (520) and the rear support (6) rotate backward synchronously, so that the upper backrest (1) can recline 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 seating according to claim 1, characterized in that, In the adaptive lumbar support state, the backrest (1) moves 0-15cm in the horizontal direction; in the self-weight tilting state, the tilting angle of the backrest (1) is 0-30°.

3. The seating according to claim 1, characterized in that, A locking device is provided between the seat support (3) and the backrest support (4). The locking device has a switchable locked state and an unlocked state. When the seat is switched to the adaptive lumbar support state, the locking device is in the locked state, and the seat support (3) and the backrest support (4) are relatively fixed. When the seat is switched to the self-weight reclining state, the locking device is in the unlocked state, and the backrest support (4) can rotate relative to the seat support (3) again.

4. The seating according to claim 3, characterized in that, The front end of the seat support (3) is provided with a first connecting part (310), and the front end of the backrest support (4) is provided with a second connecting part (410). The first connecting part (310) is hinged to the second connecting part (410). The first connecting part (310) has a first limiting hole (311) hollowed out along the left and right sides, and the second connecting part (410) has a second limiting hole (411) hollowed out along the left and right sides. The locking device includes a locking pin (401), which is slidably connected to the first limiting hole (311) and the second limiting hole (411). Locked state When the first limiting hole (311) is connected to the second limiting hole (411), the locking pin (401) slides to simultaneously engage with 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 rotate again relative to the seat support part (3).

5. The seating according to claim 4, characterized in that, The front end of the backrest support (4) is provided with two symmetrical second connecting parts (410), which are hinged to the left and right sides of the first connecting part (310). The rotating parts (530) on both sides are respectively hinged to the two second connecting parts (410). The locking device also includes a pressing part (531), which is provided on the side of the rotating part (530) close to the second connecting part (410). In the adaptive lumbar support state, the rotating part (530) rotates forward, and the pressing part (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 the locked state, and the seat support part (3) and the backrest support part (4) are relatively fixed; in the self-weight tilting state, the rotating part (530) rotates backward, and the pressing part (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 the unlocked state, so that the backrest support part (4) can rotate downward relative to the seat support part (3) again.

6. The seating according to claim 5, characterized in that, A first elastic element (402) is provided in the second limiting hole (411). The first elastic element (402) acts on the locking pin (401) and makes the locking pin (401) always have a tendency to move away from the first connecting part (310).

7. The seating according to claim 5, characterized in that, The end face of the pressing part (531) near the locking pin (401) and / or the end face of the locking pin (401) near the pressing part (531) are inclined, so that when the rotating part (530) drives the pressing part (531) to make a circular motion and pushes the locking pin (401), the locking pin (401) can slide towards the first connecting part (310) along the inclined direction of the end face.

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

9. The seating according to claim 1, characterized in that, The backrest support (4) includes a sliding support (420) extending rearward from the rear end and a sliding member (430) slidably connected to the sliding support (420) along the front-rear direction. The bottom end of the rear support (6) is hinged to the sliding member (430). In the self-loaded tilting state, the sliding member (430) is subjected to pressure from the rear support (6) and slides forward. The bottom end of the rear support (6) is driven by the sliding member (430) and slides forward, causing the top end of the rear support (6) to rotate backward and drive the backrest (1) hinged to the top end of the rear support (6) to tilt further backward.

10. The seating according to claim 9, characterized in that, A gear adjustment component (440) is fixedly connected to the sliding support (420). A gear adjustment mechanism is provided between the sliding component (430) and the gear adjustment component (440). The gear adjustment mechanism includes a locking head (441) and a plurality of gear slots (431). The locking head (441) is disposed in one of the sliding component (430) and the gear adjustment component (440), and the plurality of gear slots (431) are disposed in the other of the sliding component (430) and the gear adjustment component (440). When the sliding component (430) slides back and forth relative to the gear adjustment component (440), the locking head (441) engages with the plurality of gear slots (431) in sequence.

11. The seating according to claim 10, characterized in that, The locking head (441) is movably connected to the gear adjustment component (440), and the sliding component (430) is provided with a plurality of gear slots (431). The gear adjustment mechanism has a switchable fixed state and a sliding state. In the fixed state, the locking head (441) slides outward to engage with the gear slot (431), so that the sliding component (430) and the gear adjustment component (440) are relatively fixed. In the sliding state, the locking head (441) slides inward to retract into the gear adjustment component (440) and avoid the gear slot (431), so that the sliding component (430) can slide relative to the gear adjustment component (440) again.

12. The seating according to claim 9, characterized in that, The sliding member (430) has a plate-like structure. A first sliding support groove (432) extending in the front-back direction is hollowed out on the sliding member (430). A gear adjustment member (440) is slidably connected to the sliding member (430). A limiting part (442) is protruded on the gear adjustment member (440). The limiting part (442) passes through the first sliding support groove (432) and is connected to the sliding support part (420), so that the sliding member (430) is clamped between the sliding support part (420) and the gear adjustment member (440), and the sliding member (430) slides back and forth relative to the limiting part (442) through the first sliding support groove (432).

13. The seating according to claim 1, characterized in that, The lower end of the seat (2) is provided with two symmetrical chassis connecting parts (210). The two chassis connecting parts (210) are attached to the left and right sides of the seat support part (3). The chassis connecting parts (210) and the seat support part (3) are connected by a guide mechanism. 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 parts (210) and the seat support part (3), and the guide pin (301) is provided in the other of the chassis connecting parts (210) and the seat support part (3).

14. The seating according to claim 13, characterized in that, The guide groove (211) includes a waist support guide (211a) and a tilt guide (211b). Both the waist support guide (211a) and the tilt guide (211b) are inclined in the direction from front to back and from low to high. The inclination of the waist support guide (211a) relative to the horizontal plane is greater than that of the tilt guide (211b).

15. The seating 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 part (210) is located at the rear end of the seat (2), and the guide groove (211) is opened in the chassis connection part (210).

16. The seating according to claim 1, characterized in that, A third elastic element (220) is provided between the seat (2) and the seat support (3). In the initial state, the third elastic element (220) does not apply elastic force to the seat (2) and the seat support (3). In the adaptive lumbar support state, the third elastic element (220) applies a pushing force to the seat (2) and the seat support (3), causing the seat (2) to tend to move away from the seat support (3); in the self-weight tilting state, the third elastic element (220) applies a pulling force to the seat (2) and the seat support (3), causing the seat (2) to tend to move closer to the seat support (3).

17. The seating according to claim 16, characterized in that, The third elastic element (220) is a controllable gas spring. The seat (2) and the third elastic element (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 element (220). The adjustment switch (230) is configured to adjust the pull rope to pull or release the pin of the third elastic element (220), thereby allowing the third elastic element (220) to be fixed at any telescopic length.

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