A seat with a seat back linkage structure

Abstract

This utility model discloses a seat with a seat-back linkage structure, comprising: a seat cushion; a backrest, the backrest being disposed on the rear side of the seat cushion and hinged to the bottom of the seat cushion; a back support frame, the back support frame being fixedly disposed on the rear side of the backrest; a portion of the back support frame being bent and extending below the seat cushion; a base, the base being disposed below the seat cushion and having one end hinged to the bottom of the back support frame; and a rotating block, the two ends of the rotating block being respectively hinged to the end of the base away from the back support frame and the front bottom of the seat cushion. This utility model, through the combination of the back support frame, base, and rotating block, enables a linkage effect between the seat cushion and the backrest. When the seat back rotates, the linkage between the seat cushion and the backrest significantly reduces the degree of change in body posture, eliminating the need for frequent posture adjustments and improving the user's experience and comfort.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a seat with a seat-back linkage structure. Background Technology

[0002] In modern office environments, office chairs are indispensable pieces of equipment. People spend long periods of time sitting while working, leading to increasingly higher demands for the comfort and functionality of office chairs. Currently, office chairs on the market typically have relatively independent backrest and seat adjustments. For example, in an adjustable office chair with patent number CN105708199A, the seat cannot be adjusted in tandem with the backrest tilt, resulting in significant changes in the user's posture and requiring frequent adjustments, leading to a poor user experience.

[0003] Therefore, existing technologies still need to be improved and enhanced. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a chair with a seat-back linkage structure, which aims to solve the problem that in the prior art, the backrest and seat of office chairs are usually adjusted relatively independently. When the user adjusts the backrest tilt angle, the seat cannot be adjusted in conjunction with it, resulting in a significant change in the user's body posture and the need for the user to frequently adjust their body posture, resulting in a poor experience.

[0005] The technical solution adopted by this utility model to solve the technical problem is as follows:

[0006] In a first aspect, this utility model embodiment provides a seat with a seat-back linkage structure, comprising:

[0007] cushion;

[0008] A chair back, which is disposed on the rear side of the seat cushion and hinged to the bottom of the seat cushion;

[0009] A back support frame is fixedly mounted on the rear side of the chair back; a portion of the back support frame is bent and extends under the seat cushion.

[0010] A chassis, which is located below the seat cushion and has one end hinged to the bottom of the back basket support;

[0011] The rotating block has two ends that are respectively hinged to the end of the chassis away from the back basket support and the bottom front side of the seat cushion.

[0012] Optionally, the seat cushion includes:

[0013] The bottom of the chair back is hinged to the rear side of the bottom shell, and the top of the rotating block is hinged to the bottom of the bottom shell;

[0014] A connecting plate, which is slidably disposed on the top side of the bottom shell;

[0015] A soft pad is fixedly disposed on the top side of the connecting plate.

[0016] Optionally, the bottom of the chair back is provided with a first shaft hole, and the rear side of the bottom shell is provided with a second shaft hole. The first shaft hole and the second shaft hole correspond to each other, and the chair back and the bottom shell are rotatably connected by a pivot that passes through the first shaft hole and the second shaft hole.

[0017] Optionally, the chair back is provided with a first connecting part, which is detachably connected to the front side of the back basket bracket by bolts;

[0018] The bottom of the back support frame is provided with a second connecting part, which is detachably connected to the bottom of the chair back by bolts.

[0019] Optionally, the seat with a backrest linkage structure further includes:

[0020] The adjustable lumbar support has elastic latches on both sides.

[0021] The front side of the chair back is provided with two first sliding grooves that correspond one-to-one with the two sides of the adjustable lumbar support. Each of the two first sliding grooves is provided with a first slot strip that is distributed vertically and is wavy. The two sides of the adjustable lumbar support are respectively slidably disposed in the two first sliding grooves, and the two elastic protrusions are respectively engaged with the two first slot strips.

[0022] Two lumbar support strips are detachably mounted on the chair back and correspond one-to-one with the two first sliding grooves to abut against both sides of the adjustable lumbar support.

[0023] Optionally, the seat with a backrest linkage structure further includes:

[0024] A fore-and-aft adjustment assembly is disposed on the bottom shell to lock or unlock the connecting plate;

[0025] The bottom side of the connecting plate is provided with a second sliding groove in the front-to-back direction, and the bottom shell is provided with sliding rails distributed in the front-to-back direction, and the sliding rails are slidably connected to the second sliding groove.

[0026] Optionally, the forward and backward movement adjustment component includes:

[0027] A pull block, which is slidably disposed inside the bottom shell and extends out of the bottom shell at one end, has a first sliding hole and a groove on the pull block, and a latch at the other end of the pull block;

[0028] A first elastic element is disposed in the groove along the sliding direction of the pull block, and both ends of the first elastic element abut against the inner side of the bottom shell and one side of the groove, respectively.

[0029] A first limiting rod is disposed inside the bottom shell and located within the first sliding hole;

[0030] The second limiting rod is disposed at one end of the pull block, and the bottom shell is provided with a second sliding hole that is aligned with the first sliding hole, and the second limiting rod is located in the second sliding hole;

[0031] The bottom side of the connecting plate is provided with a second slot strip that is adapted to the bayonet and distributed in the front-back direction. The bayonet is used to engage with different parts of the second slot strip.

[0032] Optionally, the seat with a backrest linkage structure further includes:

[0033] The second elastic element has its two ends connected to the rear side inside the bottom shell and the bottom side of the connecting plate, respectively.

[0034] Optionally, the seat with a backrest linkage structure further includes:

[0035] A wear-resistant sliding strip is disposed within the bottom shell along the front-to-back direction;

[0036] The bottom side of the connecting plate is provided with a third sliding groove opened in the front-to-back direction, and the wear-resistant sliding strip is disposed in the third sliding groove and slidably connected.

[0037] Optionally, the bottom side of the connecting plate is further provided with an elastic limiting protrusion, and the rear side of the bottom shell is provided with a limiting boss. When the connecting plate slides backward to the limit position, the limiting boss abuts against the elastic limiting protrusion.

[0038] Compared with the prior art, the embodiments of this utility model have the following advantages:

[0039] This utility model embodiment provides a seat with a seat-back linkage structure, including: a seat cushion; a backrest, the backrest being disposed on the rear side of the seat cushion and hinged to the bottom of the seat cushion; a back support frame, the back support frame being fixedly disposed on the rear side of the backrest; a portion of the back support frame being bent and extending below the seat cushion; a chassis, the chassis being disposed below the seat cushion and having one end hinged to the bottom of the back support frame; and a rotating block, the two ends of the rotating block being respectively hinged to the end of the chassis away from the back support frame and the front bottom of the seat cushion. In this invention, when the chair back is rotated back and forth under external force, the combination of the backrest support, the base, and the rotating block causes the seat cushion to tilt up and down. For example, when the chair back is pushed back by external force, the rotation of the chair back causes the backrest support, the base, and the rotating block to rotate synchronously and cause the front half of the seat cushion to tilt upward. When the chair back returns to its initial position, it causes the seat cushion to return to a horizontal position. In this invention, the combination of the backrest support, the base, and the rotating block enables the chair back and the seat cushion to have a linkage effect. When the chair back rotates, the linkage between the chair back and the seat cushion can greatly reduce the degree of change in body posture, so that the user does not need to frequently adjust their posture, thus improving the user's experience and comfort. Attached Figure Description

[0040] Figure 1 A three-dimensional structural diagram of a seat with a backrest linkage structure provided for this utility model;

[0041] Figure 2 A schematic diagram of the initial state of a seat with a seat-back linkage structure provided by this utility model;

[0042] Figure 3 A schematic diagram of a seat with a backrest linkage structure after linkage adjustment, provided by this utility model;

[0043] Figure 4 An exploded view of a seat with a backrest linkage structure provided by this utility model;

[0044] Figure 5 This is a three-dimensional structural diagram of the chair back in this utility model;

[0045] Figure 6 This is a three-dimensional structural diagram of the basket support in this utility model;

[0046] Figure 7 This is a three-dimensional structural diagram of the adjustable lumbar support in this utility model;

[0047] Figure 8 This is a three-dimensional structural diagram of the connecting plate in this utility model;

[0048] Figure 9 This is a three-dimensional structural diagram of the bottom shell of this utility model;

[0049] Figure 10 This is a three-dimensional structural diagram of the forward and backward movement adjustment component in this utility model.

[0050] In the diagram: 1. Seat cushion; 101. Bottom shell; 1011. Second shaft hole; 1012. Slide rail; 1013. Second sliding hole; 1014. Limiting boss; 102. Connecting plate; 1021. Second slide groove; 1022. Second retaining groove strip; 1023. Third slide groove; 1024. Elastic limiting protrusion; 103. Soft padding; 2. Chair back; 201. First shaft hole; 202. First connecting part; 203. First slide groove; 204. First retaining groove strip; 3. Back basket support; 301. Second connecting part; 4. Chassis; 5. Rotating block; 6. Lifting lumbar support; 601. Elastic locking protrusion; 7. Lumbar support pressure strip; 8. Forward and backward movement adjustment assembly; 801. Pull block; 8011. First sliding hole; 8012. Groove; 8013. Bayonet; 8014. Sleeve rod; 802. First elastic element; 803. First limiting rod; 804. Second limiting rod; 9. Second elastic element; 10. Pad; 11. Wear-resistant sliding strip. Detailed Implementation

[0051] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0052] Example:

[0053] Please see Figures 1-10 The seat with a seat-back linkage structure includes: a seat cushion 1; a backrest 2, which is disposed on the rear side of the seat cushion 1 and hinged to the bottom of the seat cushion 1; a back support 3, which is fixedly disposed on the rear side of the backrest 2; a portion of the back support 3 is bent and extends to the bottom of the seat cushion 1; a chassis 4, which is disposed below the seat cushion 1 and has one end hinged to the bottom of the back support 3; and a rotating block 5, whose two ends are respectively hinged to the end of the chassis 4 away from the back support 3 and the front bottom of the seat cushion 1.

[0054] like Figure 1-3As shown, in this embodiment, the seat with a seat-back linkage structure includes a seat cushion 1, a backrest 2, a back support bracket 3, a chassis 4, and a rotating block 5. The seat cushion 1 remains horizontal in its normal static state. The backrest 2 is located behind the seat cushion 1 to support the back of the user, and its bottom end is hinged to the rear end of the bottom of the seat cushion 1. The back support bracket 3 is located behind the backrest 2 and fixedly connected to it, with its bottom end positioned below the seat cushion 1. The chassis 4 is located below the seat cushion 1, and its left end is hinged to the bottom end of the back support bracket 3. The upper end of the rotating block 5 is hinged to the bottom side of the front half of the seat cushion 1, and its lower end is hinged to the right end of the chassis 4.

[0055] When the chair back 2 is subjected to the pressure of a person's back leaning backward, the chair back 2 drives the backrest support 3 to rotate backward simultaneously. When the backrest support 3 rotates backward, the bottom end of the backrest support 3 tilts upward, and the bottom end of the backrest support 3 pushes the base 4 forward. When the base 4 moves forward, it lifts the front half of the seat cushion 1 upward through the rotating block 5. See details. Figure 3 This enables the linkage between the chair back 2 and the seat cushion 1. When the chair back 2 returns to its initial position, the backrest support 3 rotates forward along with the chair back 2, and the connection between the backrest support 3 and the chassis 4 moves downward. The chassis 4 drives the lower end of the rotating block 5 to move backward, and the upper end of the rotating block 5 moves forward, causing the seat cushion 1 to return to a horizontal state. See details. Figure 2 In this embodiment, the combination of the backrest support 3, the chassis 4, and the rotating block 5 enables the backrest 2 and the seat cushion 1 to have a linkage effect. When the backrest 2 rotates, the linkage between the backrest 2 and the seat cushion 1 can greatly reduce the degree of change in body posture, so that the user does not need to frequently adjust their posture, thus improving the user's experience and comfort.

[0056] like Figure 4 As shown, the seat cushion 1 further includes a base shell 101, a connecting plate 102, and a soft pad 103. The bottom end of the backrest 2 is hinged to the rear side of the base shell 101, and the top end of the rotating block 5 is hinged to the bottom side of the front half of the base shell 101. The connecting plate 102 is slidably disposed on the top side of the base shell 101. The soft pad 103 is fixedly disposed on the top side of the connecting plate 102.

[0057] like Figure 5As shown, specifically, the bottom of the chair back 2 is provided with a first shaft hole 201, and the rear side of the bottom shell 101 is provided with a second shaft hole 1011. The first shaft hole 201 and the second shaft hole 1011 correspond to each other. The chair back 2 and the bottom shell 101 are rotatably connected by a pivot inserted into the first shaft hole 201 and the second shaft hole 1011. The hinges between the backrest support 3 and the chassis 4, the chassis 4 and the rotating block 5, and the rotating block 5 and the bottom shell 101 are all achieved by opening holes and inserting pivots into the holes, so as to facilitate the assembly and disassembly of each component. When the chair back 2 is subjected to an external force in the front-back direction, it will rotate relative to the bottom shell 101, and the combined structure of the backrest support 3, the chassis 4 and the rotating block 5 will cause the front half of the bottom shell 101 to tilt upward. Meanwhile, a pad 10 is provided between the bottom shell 101 and the connecting plate 102. The pad 10 is fixedly connected to the bottom side of the connecting plate 102 by screws. The pad 10 is used to strengthen the support effect of the periphery of the connecting plate 102 and improve the stability of the overall structure of the seat cushion 1.

[0058] like Figure 6 As shown, further, the chair back 2 is provided with a first connecting part 202, which is detachably connected to the front side of the back support frame 3 by bolts; the bottom of the back support frame 3 is provided with a second connecting part 301, which is detachably connected to the bottom of the chair back 2 by bolts. Specifically, the first connecting part 202 is used to fix the chair back 2 and the back support frame 3 in the front-back direction, and the second connecting part 301 is used to fix the chair back 2 and the back support frame 3 in the vertical direction. The combination of the first connecting part 202 and the second connecting part 301 improves the connection stability between the chair back 2 and the back support frame 3 and enhances the support performance of the chair back 2.

[0059] like Figure 7 As shown, in this embodiment, the seat with a seat-back linkage structure further includes a height-adjustable lumbar support 6 and two lumbar support strips 7. The height-adjustable lumbar support 6 has elastic locking protrusions 601 on both sides. The front side of the seat back 2 has two first sliding grooves 203 corresponding to the two sides of the height-adjustable lumbar support 6. Each of the two first sliding grooves 203 has a vertically distributed, wavy first slot strip 204. The two sides of the height-adjustable lumbar support 6 are slidably disposed within the two first sliding grooves 203, and the two elastic locking protrusions 601 are respectively engaged with the two first slot strips 204. The two lumbar support strips 7 are detachably disposed on the seat back 2 and correspond one-to-one with the two first sliding grooves 203 to abut against the two sides of the height-adjustable lumbar support 6.

[0060] Specifically, the first slot strip 204 has multiple arc-shaped grooves evenly distributed vertically. The elastic protrusion 601 is used to engage with any of the arc-shaped grooves. When the lifting lumbar support 6 is subjected to an external force in the vertical direction, the elastic protrusion 601 will deform and can move up and down along the first slot strip 204. When the external force is removed, the lifting lumbar support 6 is fixed again by engaging the elastic protrusion 601 with the first slot strip 204. The adjustment method of the lifting lumbar support 6 is simple and convenient. The lumbar support pressure strip 7 can cover the first slide groove 203 to keep the first slide groove 203 clean and prevent foreign objects from entering the first slide groove 203 and interfering with the sliding effect of the elastic protrusion 601. At the same time, the lumbar support pressure strip 7 provides fixed support for both sides of the lifting lumbar support 6.

[0061] like Figures 8-10 As shown, the seat with the backrest linkage structure further includes a front-to-back movement adjustment component 8, which is disposed on the bottom shell 101 to lock or unlock the connecting plate 102.

[0062] The bottom side of the connecting plate 102 is provided with a second sliding groove 1021 opened in the front-back direction, and the bottom shell 101 is provided with a sliding rail 1012 distributed in the front-back direction. The sliding rail 1012 is slidably connected to the second sliding groove 1021.

[0063] Specifically, the fore-and-aft adjustment component 8 is used to assist in adjusting the fore-and-aft movement of the seat cushion 1. When the fore-and-aft adjustment component 8 unlocks the connecting plate 102, the connecting plate 102 can slide forward and backward under the action of external force through the combination of the slide rail 1012 and the second slide groove 1021. When it slides to a designated position, it can be locked again by the fore-and-aft adjustment component 8. At the same time, an existing rocking lock can also be set on the bottom shell 101 to control the linkage between the backrest 2 and the seat cushion 1. For example, the handle part of the rocking lock can be set on the bottom shell 101, and the locking structure of the rocking lock can be set in the chassis 4. The handle part drives the locking structure to complete the unlocking or locking of the bottom shell 101 and the chassis 4. When the rocking lock locks the bottom shell 101 and the chassis 4, the backrest 2 cannot rotate under external force. When the rocking lock unlocks the bottom shell 101 and the chassis 4, the backrest 2 will move together with the seat cushion under external force.

[0064] Furthermore, the forward and backward movement adjustment assembly 8 includes a pull block 801, a first elastic element 802, a first limiting rod 803, and a second limiting rod 804. The pull block 801 is slidably disposed within the bottom shell 101 with one end extending out of the bottom shell 101. The pull block 801 is provided with a first sliding hole 8011 and a groove 8012, and the other end of the pull block 801 is provided with a latch 8013. The first elastic element 802 is disposed within the groove 8012 along the sliding direction of the pull block 801, and both ends of the first elastic element 802 are respectively connected to the inner side of the bottom shell 101 and the groove 8012. One side of the groove 8012 abuts against the groove; the limiting rod is disposed in the bottom shell 101 and located in the first sliding hole 8011; the second limiting rod 804 is disposed at one end of the pull block 801, the bottom shell 101 is provided with a second sliding hole 1013 aligned with the first sliding hole, and the second limiting rod 804 is located in the second sliding hole 1013; the bottom side of the connecting plate 102 is provided with a second slot strip 1022 that is adapted to the bayonet 8013 and distributed in the front-back direction, and the bayonet 8013 is used to engage with different parts of the second slot strip 1022.

[0065] Specifically, the front-to-back movement adjustment component 8 is used as follows: When it is necessary to adjust the front-to-back position of the seat cushion 1, firstly, manually pull one end of the pull block 801 outward. At this time, the latch 8013 separates from the second slot strip 1022. Then, use external force to slide the seat cushion 1 forward. After the seat cushion 1 has slid a certain distance, release the pull block 801. Under the action of the first elastic element 802, the pull block 801 returns to its initial position and re-engages with the second slot strip 1022. At this time, the seat cushion 1 is fixed again. The first elastic element 802 is a spring. During the pulling process of the pull block 801, the spring is compressed. A sleeve rod 8014 is provided on one side of the groove 8012. The end of the first elastic element 802 that abuts against the groove 8012 is sleeved on the sleeve rod 8014. During the sliding process of the pull block 801, the first sliding hole 8011 and the first limiting rod 803 move relative to each other, and the second sliding hole 1013 and the second limiting rod 804 move relative to each other. The first sliding hole 8011 and the second sliding hole 1013 are both elongated holes and have the same opening direction.

[0066] In this embodiment, the seat with a seat-back linkage structure further includes a second elastic element 9. The two ends of the second elastic element 9 are respectively connected to the rear side of the bottom shell 101 and the bottom side of the connecting plate 102. Specifically, the second elastic element 9 is a spring. When the seat cushion 1 moves forward, the second elastic element 9 deforms and is stretched, and the second elastic element 9 is used to pull the seat cushion 1 backward to reset it.

[0067] Furthermore, the seat with the backrest linkage structure also includes a wear-resistant slide strip 11, which is arranged in the bottom shell 101 in the front-back direction; the bottom side of the connecting plate 102 is provided with a third slide groove 1023 opened in the front-back direction, the wear-resistant slide strip 11 is arranged in the third slide groove 1023 and slidably connected, and the cooperation between the wear-resistant slide strip 11 and the third slide groove 1023 guides the sliding of the connecting plate 102.

[0068] Furthermore, the bottom side of the connecting plate 102 is provided with an elastic limiting protrusion 1024, and the rear side of the bottom shell 101 is provided with a limiting boss 1014. When the connecting plate 102 slides backward to its limit position, the limiting boss 1014 abuts against the elastic limiting protrusion 1024. Specifically, when the seat cushion 1 is pulled backward by the second elastic member 9 until the elastic limiting protrusion 1024 abuts against the limiting boss 1014, the seat cushion 1 returns to its original position. The cooperation between the elastic limiting protrusion 1024 and the limiting boss 1014 plays a limiting role for the connecting plate 102.

[0069] In summary, this utility model embodiment provides a seat with a seat-back linkage structure, including: a seat cushion 1; a back support bracket 3, the back support bracket 3 being fixedly disposed on the rear side of the backrest 2; a portion of the back support bracket 3 being bent and extending below the seat cushion 1; a chassis 4, the chassis 4 being disposed below the seat cushion 1 and having one end hinged to the bottom of the back support bracket 3; and a rotating block 5, the two ends of the rotating block 5 being respectively hinged to the end of the chassis 4 away from the back support bracket 3 and the front bottom of the seat cushion 1. In this invention, when the backrest 2 is rotated back and forth by an external force, the backrest 2 drives the seat cushion 1 to tilt up and down through the combination of the backrest support 3, the base 4, and the rotating block 5. For example, when the backrest 2 is pushed back by an external force, the backrest 2 rotates synchronously, causing the backrest support 3, the base 4, and the rotating block 5 to tilt up, and the front half of the seat cushion 1 tilts up. When the backrest 2 returns to its initial position, it drives the seat cushion 1 to return to a horizontal position. In this invention, the combination of the backrest support 3, the base 4, and the rotating block 5 enables the backrest 2 and the seat cushion 1 to have a linkage effect. When the backrest 2 rotates, the linkage between the backrest 2 and the seat cushion 1 can greatly reduce the degree of change in body posture, so that the user does not need to frequently adjust their posture, thus improving the user's experience and comfort.

[0070] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0072] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0073] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0074] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0075] Of course, the above description of the embodiments of this utility model is quite detailed, but it should not be construed as a limitation on the scope of protection of this utility model. This utility model may have other various implementations. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model. The scope of protection of this utility model is subject to the appended claims.

Claims

1. A seat with a seat-back linkage structure, characterized in that, include: cushion; A chair back, which is disposed on the rear side of the seat cushion and hinged to the bottom of the seat cushion; A back support frame, which is fixedly installed on the rear side of the chair back; A portion of the back support frame bends and extends beneath the seat cushion; A chassis, which is located below the seat cushion and has one end hinged to the bottom of the back basket support; The rotating block has two ends that are respectively hinged to the end of the chassis away from the back basket support and the bottom front side of the seat cushion.

2. The seat with a seat-back linkage structure according to claim 1, characterized in that, The cushion includes: The bottom of the chair back is hinged to the rear side of the bottom shell, and the top of the rotating block is hinged to the bottom side of the front half of the bottom shell. A connecting plate, which is slidably disposed on the top side of the bottom shell; A soft pad is fixedly disposed on the top side of the connecting plate.

3. The seat with a seat-back linkage structure according to claim 2, characterized in that, The bottom of the chair back is provided with a first shaft hole, and the rear side of the bottom shell is provided with a second shaft hole. The first shaft hole and the second shaft hole correspond to each other. The chair back and the bottom shell are rotatably connected by a pivot that passes through the first shaft hole and the second shaft hole.

4. The seat with a seat-back linkage structure according to claim 2, characterized in that, The chair back is provided with a first connecting part, which is detachably connected to the front side of the back basket bracket by bolts. The bottom of the back support frame is provided with a second connecting part, which is detachably connected to the bottom of the chair back by bolts.

5. The seat with a seat-back linkage structure according to claim 1, characterized in that, Also includes: The adjustable lumbar support has elastic latches on both sides. The front side of the chair back is provided with two first sliding grooves that correspond one-to-one with the two sides of the adjustable lumbar support. Each of the two first sliding grooves is provided with a first slot strip that is distributed vertically and is wavy. The two sides of the adjustable lumbar support are respectively slidably disposed in the two first sliding grooves, and the two elastic protrusions are respectively engaged with the two first slot strips. Two lumbar support strips are detachably mounted on the chair back and correspond one-to-one with the two first sliding grooves to abut against both sides of the adjustable lumbar support.

6. The seat with a seat-back linkage structure according to claim 2, characterized in that, Also includes: A fore-and-aft adjustment assembly is disposed on the bottom shell to lock or unlock the connecting plate; The bottom side of the connecting plate is provided with a second sliding groove in the front-to-back direction, and the bottom shell is provided with sliding rails distributed in the front-to-back direction, and the sliding rails are slidably connected to the second sliding groove.

7. The seat with a seat-back linkage structure according to claim 6, characterized in that, The forward and backward movement adjustment component includes: A pull block, which is slidably disposed inside the bottom shell and extends out of the bottom shell at one end, has a first sliding hole and a groove on the pull block, and a latch at the other end of the pull block; A first elastic element is disposed in the groove along the sliding direction of the pull block, and both ends of the first elastic element abut against the inner side of the bottom shell and one side of the groove, respectively. A first limiting rod is disposed inside the bottom shell and located within the first sliding hole; The second limiting rod is disposed at one end of the pull block, and the bottom shell is provided with a second sliding hole that is aligned with the first sliding hole, and the second limiting rod is located in the second sliding hole; The bottom side of the connecting plate is provided with a second slot strip that is adapted to the bayonet and distributed in the front-back direction. The bayonet is used to engage with different parts of the second slot strip.

8. The seat with a seat-back linkage structure according to claim 7, characterized in that, Also includes: The second elastic element has its two ends connected to the rear side inside the bottom shell and the bottom side of the connecting plate, respectively.

9. The seat with a seat-back linkage structure according to claim 7, characterized in that, Also includes: A wear-resistant sliding strip is disposed within the bottom shell along the front-to-back direction; The bottom side of the connecting plate is provided with a third sliding groove opened in the front-to-back direction, and the wear-resistant sliding strip is disposed in the third sliding groove and slidably connected.

10. The seat with a seat-back linkage structure according to claim 7, characterized in that, The bottom side of the connecting plate is also provided with an elastic limiting protrusion, and the rear side of the bottom shell is provided with a limiting boss. When the connecting plate slides backward to the limit position, the limiting boss abuts against the elastic limiting protrusion.

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