Waist support assembly of seat and seat

Abstract

The utility model discloses a waist support assembly of a seat and the seat. The waist support assembly of the seat comprises a bracket, a front connecting rod, a rear connecting rod, an upper connecting rod, a lower connecting rod, a telescopic mechanism and a waist support, the upper connecting rod is fixed to the support, the upper end of the front connecting rod is hinged to the front end of the upper connecting rod, the rear connecting rod is located on the rear side of the front connecting rod, the upper end of the rear connecting rod is hinged to the rear end of the upper connecting rod, and the lower end of the front connecting rod and the lower end of the rear connecting rod are both hinged to the lower connecting rod. The front connecting rod, the rear connecting rod, the upper connecting rod and the lower connecting rod jointly form a parallel four-connecting-rod mechanism; the waist support is connected to the lower connecting rod; the telescopic mechanism comprises a first end, a second end and a locking piece, and the locking piece is used for locking the first end and the second end so that the first end and the second end can be kept relatively fixed and unlocking the first end and the second end so that the first end and the second end can move relatively. According to the utility model, when the waist support is adjusted to different positions, the waist support can be completely attached to the waist of a user, so that the comfort of the seat is improved.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, specifically to a lumbar support component and a seat. Background Technology

[0002] To provide lumbar support and prevent fatigue caused by unsupported lower back, many office and gaming chairs are equipped with lumbar support systems. These systems typically offer adjustable support to accommodate different sitting postures and body types. However, current lumbar support systems often use a back-and-forth swing adjustment method. This method results in a significant difference in position between the top and bottom of the lumbar support before and after adjustment. Only when the support is adjusted to a specific angle can it properly conform to the user's lower back. When the support is swung to other angles, the support surface fails to fully conform to the user's lower back, and its comfort level still falls short of expectations. Utility Model Content

[0003] The purpose of this utility model is to provide a lumbar support component and a seat, which adjusts the lumbar support in a translational manner to meet the different sitting postures and body shapes of users, and ensures that the lumbar support can fully fit the user's waist when adjusted to different positions.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The lumbar support assembly of the seat includes a bracket, a front link, a rear link, an upper link, a lower link, a telescopic mechanism, and a lumbar support;

[0006] The upper link is fixed to the bracket. The upper end of the front link is hinged to the front end of the upper link. The rear link is located behind the front link and its upper end is hinged to the rear end of the upper link. The lower ends of the front link and the rear link are both hinged to the lower link. The front link, rear link, upper link, and lower link together form a parallel four-bar linkage. The waist support is connected to the lower link.

[0007] The telescopic mechanism includes a first end hinged to the front link, a second end hinged to the bracket, and a locking member. The locking member is used to lock the first end and the second end to keep the first end and the second end relatively fixed, and to unlock the first end and the second end to allow the first end and the second end to move relative to each other.

[0008] Preferably, the telescopic mechanism includes a first movable seat and a second movable seat, which are sleeved together so that they can slide relative to each other; the first movable seat is hinged to the front connecting rod through a first end, and the second movable seat is hinged to the bracket through a second end.

[0009] Preferably, a mating part is provided on the first movable seat, the mating part including multiple locking grooves, the multiple locking grooves being arranged sequentially from the first end to the second end; a locking member is located between the first movable seat and the second movable seat and is movably connected to the second movable seat, so that the locking member can move between a first position engaging with one of the locking grooves of the mating part and a second position disengaging from the mating part; an elastic member is provided between the locking member and the second movable seat, the elastic member being used to apply elastic stress to the locking member so that the locking member always maintains the tendency to move towards the first position.

[0010] Preferably, the locking member is provided with a protrusion for engaging with one of the locking slots when the locking member is in the first position; the protrusion engages with the locking slot and is configured to limit the movement of the first movable seat toward the direction of the second end, and to allow the protrusion to disengage from the locking slot when the first movable seat moves away from the second end.

[0011] Preferably, the first movable seat is provided with a first pushing part, a second pushing part, and a third pushing part; the first pushing part, the mating part, the second pushing part, and the third pushing part are arranged sequentially in the direction from the first end to the second end; the second movable seat is provided with a guide groove, the guide groove including a first segment and a second segment, the extension direction of the first segment is consistent with the direction from the first end to the second end, and the second segment extends from the end of the first segment near the second end towards the mating part; the locking member is provided with a guide post that slides and is embedded in the guide groove; the second pushing part is used to move the first movable seat away from the second end to... When the second pushing part contacts the locking member, it pushes the locking member from the first position to the second position so that the guide post slides along the second section of the guide groove to the junction of the second section and the first section; the third pushing part is used to push the locking member towards the first end when the first movable seat moves towards the second end and the third pushing part contacts the locking member so that the guide post slides from the junction of the first section and the second section of the guide groove towards the first end; the first pushing part is used to push the locking member towards the second end when the first movable seat moves towards the second end and the first pushing part contacts the locking member.

[0012] Preferably, the second movable seat is provided with a slide groove whose extension direction is consistent with the extension direction of the first section of the guide groove. The slide groove is located on the side of the guide groove near the second end. The locking member is provided with a sliding post, which is embedded in the slide groove and configured to slide along the extension direction of the slide groove and to rotate within the slide groove.

[0013] Preferably, the locking groove includes a baffle wall near the first end and an inclined guide wall near the second end. When the protruding tooth is engaged in the locking groove, the protruding tooth abuts against the baffle wall. The cooperation between the protruding tooth and the baffle wall limits the degree of freedom of the baffle wall to move toward the second end. The inclined guide wall is used to push the protruding tooth out of the locking groove when the first movable seat moves away from the second end.

[0014] Preferably, the lumbar support includes an outer frame, with the front link and the rear link both positioned between two vertical beams of the outer frame. The front link and the rear link are both inverted V-shapes to form a receiving space between them and the bottom crossbeam of the outer frame, within which a massage mechanism mounted on the outer frame is disposed.

[0015] Preferably, a tension spring is provided between the front link and the upper link to pull the front link backward;

[0016] And / or, a mounting base is provided on the lumbar support, and two limiting walls are provided on the mounting base in a front-rear direction. The mounting base is pivotally connected to the lower connecting rod through a pivot. A stop part is provided on the lower connecting rod between the two limiting walls. The stop part abuts against the limiting wall located on the rear side, and a spring is clamped between the stop part and the limiting wall located on the front side.

[0017] Seats, including the aforementioned lumbar support components for seats.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] In this invention, the front link, rear link, upper link, and lower link together form a parallel four-bar linkage. By using a telescopic mechanism to drive the deformation of the parallel four-bar linkage, the lower link of the parallel four-bar linkage can move back and forth, thereby realizing the forward and backward translational adjustment of the lumbar support. This allows the lumbar support to meet the body shape and different sitting postures of different users, ensuring that the lumbar support can fully conform to the user's waist when adjusted to different positions, thus improving the comfort of the seat. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 4 for Figure 1 Schematic diagram of the telescopic mechanism;

[0024] Figure 5 for Figure 1Cross-sectional view of the telescopic mechanism;

[0025] Figure 6-8 This is a schematic diagram of the adjustment process of this utility model;

[0026] Figure 9 for Figure 5 A magnified view of point B in the middle.

[0027] Wherein: 10. Bracket; 11. Fixed seat; 12. Rotary seat; 21. Front connecting rod; 22. Rear connecting rod; 23. Upper connecting rod; 231. Tension spring; 24. Lower connecting rod; 241. Stop part; 300. Telescopic mechanism; 30. First movable seat; 301. First end; 31. Locking groove; 311. Baffle wall; 312. Inclined guide wall; 32. First pushing part; 33. Second pushing part; 34. Third pushing part; 40. Second movable seat; 40. 1. Second end; 41. Mounting groove; 50. Locking element; 501. Raised tooth; 51. Guide post; 52. Sliding post; 54. Spring; 60. Side cover; 61. Guide groove; 611. First section; 612. Second section; 62. Sliding groove; 70. Waist support; 71. Vertical beam; 72. Bottom crossbeam; 73. Mounting seat; 732. Front limiting wall; 733. Rear limiting wall; 734. Spring; 735. Rotating shaft; 80. Massage mechanism. Detailed Implementation

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the 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 application, and should not be construed as limiting this application.

[0029] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not 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 on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] like Figure 1 , 2As shown in Figures 3, 4, and 5, this utility model discloses a lumbar support assembly for a seat, comprising a bracket 10, a front connecting rod 21, a rear connecting rod 22, an upper connecting rod 23, a lower connecting rod 24, a telescopic mechanism 300, and a lumbar support 70. A fixed seat 11 is provided on the bracket 10, and the upper connecting rod 23 is fixed to the fixed seat 11, thereby fixing the upper connecting rod 23 to the bracket 10. The upper end of the front connecting rod 21 is hinged to the front end of the upper connecting rod 23, allowing the front connecting rod 21 to rotate relative to the upper connecting rod 23 around axis O1. The rear connecting rod 22 is located behind the front connecting rod 21, and its upper end is hinged to the rear end of the upper connecting rod 23, allowing the rear connecting rod 22 to rotate relative to the upper connecting rod 23 around axis O2. The lower end of the front connecting rod 21 is hinged to the lower connecting rod 24. The front link 21 can rotate relative to the lower link 24 about axis O3, and the lower end of the rear link 22 is hinged to the lower link 24, allowing the rear link 22 to rotate relative to the lower link 24 about axis O4. The front link 21, rear link 22, upper link 23, and lower link 24 together form a parallel four-bar linkage, that is, the distance between the aforementioned axes O1 and O2 is equal to the distance between the axes O3 and O4. Since the upper link 23 is fixed on the bracket 10, in the parallel four-bar linkage, the lower link 24, which is opposite to the upper link 23, has a degree of freedom of translational movement relative to the bracket 10. The lumbar support 70 is installed on the lower link 24, thereby giving the lumbar support 70 a degree of freedom of translational movement relative to the bracket 10. The telescopic mechanism 300 includes a first end 301 and a second end 401. The first end 301 is hinged to the front connecting rod 21, and the second end 401 is hinged to the bracket 10. When the telescopic mechanism 300 extends, the distance between the first end 301 and the second end 401 increases, which can push the front connecting rod 21 forward and move the lower connecting rod 24 in the parallel four-bar linkage forward. When the telescopic mechanism 300 retracts, the distance between the first end 301 and the second end 401 decreases, which can pull the front connecting rod 21 backward and move the lower connecting rod 24 in the parallel four-bar linkage backward. The telescopic mechanism 300 also includes a locking member 50, which is used to lock and unlock the first end 301 and the second end 401. When the locking member 50 locks the first end 301 and the second end 401, the first end 301 and the second end 401 remain relatively fixed. At this time, the telescopic mechanism 300 can provide a stable supporting force to keep the parallel four-bar linkage in the corresponding state. When the locking mechanism 50 unlocks the first end 301 and the second end 401, the parallel four-bar linkage can deform, thereby enabling the lower link 24 to move back and forth, thereby realizing the adjustment of the front and back position of the lumbar support 70.

[0032] In this invention, the front link 21, rear link 22, upper link 23, and lower link 24 together form a parallel four-bar linkage. The telescopic mechanism 300 drives the deformation of the parallel four-bar linkage, which allows the lower link 24 of the parallel four-bar linkage to move back and forth, thereby realizing the forward and backward translational adjustment of the lumbar support 70. This allows the lumbar support 70 to meet the body shape and different sitting posture of different users, ensuring that the lumbar support 70 can fully fit the user's waist when adjusted to different positions, thus improving the comfort of the seat.

[0033] In a preferred embodiment, the telescopic mechanism 300 includes a first movable seat 30 and a second movable seat 40. The first movable seat 30 and the second movable seat 40 are sleeved together so that they can slide relative to each other, thereby allowing the first end 301 on the first movable seat 30 to move relative to the second end 401 on the second movable seat 40. The first movable seat 30 is hinged to the front connecting rod 21 through the first end 301, and the second movable seat 40 is hinged to the rotating seat 12 fixed on the bracket 10 through the second end 401. In some embodiments, the second movable seat 40 may be sleeved on the first movable seat 30, so that the first movable seat 30 can move relative to the second movable seat 40 in the length direction of the second movable seat 40 to realize the extension or shortening of the telescopic mechanism 300. The locking member 50 may be a pin installed on the second movable seat 40. After the first movable seat 30 and the second movable seat 40 move relative to each other to the corresponding position, the pin passes through the pin hole at the corresponding position of the first movable seat 30 to lock the two together. When it is necessary to adjust the front and rear position of the waist support 70, the pin can be disengaged from the pin hole on the first movable seat 30.

[0034] In a preferred embodiment, the first movable seat 30 is provided with a mating part, which includes a plurality of locking grooves 31 arranged sequentially in the direction from the first end 301 to the second end 401 (i.e., the X direction in the figure). A locking member 50 is located between the first movable seat 30 and the second movable seat 40, and is movably connected to the second movable seat 40, allowing the locking member 50 to move between a first position engaging with one of the locking grooves 31 of the mating part and a second position disengaging from the mating part. That is, the locking member 50 can move relative to the second movable seat 40 in the Y direction perpendicular to the X direction. A spring 54 is also provided between the locking member 50 and the second movable seat 40, applying an elastic stress to the locking member 50 to maintain a tendency to move towards the first position. In other words, when not subjected to other external forces, the locking member 50 can remain in the first position, engaging with one of the locking grooves 31. The spring 54 can also be a spring sheet or other elastic element. When the locking member 50 engages with the locking groove 31, the locking member 50 locks the first movable seat 30 and the second movable seat 40, keeping them relatively fixed. When it is necessary to adjust the front and back position of the waist support 70, the locking member 50 is moved along the Y direction to the second position and separated from the mating part by external force to overcome the elastic stress of the spring 54, thereby releasing the locking member 50 from locking the relative movement of the first movable seat 30 and the second movable seat 40. The locking member 50 is provided with a protruding tooth 501. When the locking member 50 moves to the first position relative to the second movable seat 40 along the Y direction, the protruding tooth 501 engages with one of the locking grooves 31, thus engaging the locking member 50 with the locking groove 31. The engagement of the protruding tooth 501 and the locking groove 31 makes the first movable seat 30 and the second movable seat 40 form a one-way mechanism. Specifically, when the protruding tooth 501 engages with the locking groove 31, the two mechanisms can limit the movement of the first movable seat 30 along the X direction toward the second end 401 of the second movable seat 40. In this way, the telescopic mechanism 300 can provide a stable... A certain supporting force is provided to prevent the lumbar support 70 from shifting abnormally backward. When the first movable seat 30 moves along the X direction toward the second end 401 away from the second movable seat 40, the protruding tooth 501 can disengage from the locking groove 31. When it is necessary to adjust the lumbar support 70 forward, the lumbar support 70 can be pulled forward directly, allowing the telescopic mechanism 300 to extend freely. After the first movable seat 30 moves forward a predetermined distance, under the elastic stress of the spring 54, the protruding tooth 501 engages in the corresponding locking groove 31, completing the forward adjustment of the lumbar support 70, making the adjustment of the lumbar support 70 simple and convenient. When it is necessary to adjust the lumbar support 70 backward, the locking member 50 can be moved to the second position relative to the second movable seat 40. At this time, the protruding tooth 501 on the locking member 50 no longer obstructs the first movable seat 30. After pushing the lumbar support 70 backward to the predetermined position, the external force on the locking member 50 can be released.The first movable seat 30 is provided with a first pushing part 32, a second pushing part 33, and a third pushing part 34. The first pushing part 32, the mating part, the second pushing part 33, and the third pushing part 34 are arranged sequentially from the first end 301 to the second end 401 (i.e., the X direction in the figure). The second movable seat 40 is provided with a guide groove 61, which includes a first segment 611 and a second segment 612. The extension direction of the first segment 611 is consistent with the X direction in the figure. The second segment 612 extends from the end of the first segment 611 near the second end 401 along the Y direction in the figure towards the mating part. The locking member 50 is provided with a guide post 51 that slides and is embedded in the guide groove 61. The second pushing part 33 is used to move the first movable seat 30 in a direction away from the second end 401 to... When the second pushing part 33 contacts the locking member 50, it pushes the locking member 50 from the first position to the second position, and causes the guide post 51 on the locking member 50 to slide along the second section 612 of the guide groove 61 to the position where the second section 612 connects with the first section 611. When the first movable seat 30 moves away from the second end 401, the locking member 50 contacts the third pushing part 34. The third pushing part 34 pushes the locking member 50 in the X direction toward the first end 301, causing the guide post 51 on the locking member 50 to slide from the position where the first section 611 connects with the second section 612 of the guide groove 61 toward the first end 301. Finally, the guide post 51 falls into the first section 611 of the guide groove 61, and the first section 611 of the guide groove 61 limits the locking member 50 to the second position. The first pushing part 32 is used to push the locking member 50 toward the second end 401 when the first movable seat 30 moves toward the direction closer to the second end 401 and the first pushing part 32 contacts the locking member 50, so that the guide post 51 slides to the junction of the first section 611 and the second section 612 of the guide groove 61. At this time, under the elastic stress of the spring 54, the guide post 51 is no longer limited by the first section 611 of the guide groove 61, and the locking member 50 can move to the first position along the Y direction. In the above structure, the locking member 50 is configured to translate in the Y direction to achieve movement between the first position and the second position. In a preferred embodiment, the locking member 50 can be configured to swing relative to the second movable seat 40. The swinging locking member 50 can better engage with the locking groove 31 and disengage from the locking groove 31, avoiding the locking member 50 from getting stuck. Specifically, the second movable seat 40 is provided with a sliding groove 62 whose extension direction is consistent with the extension direction of the first section 611 of the guide groove 61. That is, the extension direction of the sliding groove 62 is consistent with the Y direction in the figure. The sliding groove 62 is located on the side of the guide groove 61 near the second end 401. The locking member 50 is provided with a sliding post 52, which is embedded in the sliding groove 62. It can slide along the extension direction of the sliding groove 62 and can also rotate within the sliding groove 62. For example, the cross-section of the sliding post 52 can be set to a circle.With the above structure, this utility model allows for convenient front-to-back adjustment of the lumbar support 70. Whether adjusting the lumbar support 70 forward or backward, it can be done with one hand. Figure 5 In the indicated state, if it is necessary to adjust the lumbar support 70 forward, the lumbar support 70 can be pulled forward directly. The deformation of the parallel four-bar linkage causes the front link 21 to swing forward. The front link 21 pulls the first movable seat 30 to move away from the second end 401. The protrusion 501 on the locking member 50 can disengage from the locking groove 31. When the lumbar support 70 is adjusted to the correct position, the protrusion 501 on the locking member 50 engages with the corresponding locking groove 31, thus completing the forward adjustment of the lumbar support 70. Figure 5 In the position shown, if it is necessary to adjust the lumbar support 70 backward, as shown Figure 6 As shown, the lumbar support 70 can be pulled forward first, and the front connecting rod 21 drives the first movable seat 30 to move away from the second end 401. When the second pushing part 33 contacts the locking part 50, it pushes the locking part 50, causing the locking part 50 to move to the second position, and the locking part 50 disengages from the mating part, as shown. Figure 7 As shown, the first movable seat 30 continues to move away from the second end 401, and the third pushing part 34 contacts the locking member 50, pushing the locking member 50 towards the first end 301. The guide post 51 on the locking member 50 slides into the first section 611 of the guide groove 61. At the same time, the sliding post 52 slides along the sliding groove 62. At this time, the locking member 50 is limited to the second position by the first section 611 of the guide groove 61. Then, as... Figure 8 As shown, when the lumbar support 70 is moved backward, the front connecting rod 21 drives the first movable seat 30 to move towards the second end 401. When the lumbar support 70 moves to near its rearward limit position, the first pushing part 32 contacts the locking member 50 and pushes the locking member 50 towards the second end 401. At this time, the guide post 51 on the locking member 50 slides along the first section 611 of the guide groove 61 to the position where the first section 611 and the second section 612 are connected. At the same time, the sliding post 52 slides along the sliding groove 62. At the connection between the first section 611 and the second section 612, since the guide post 51 is no longer pushed by the first... As defined in section 611, under the elastic stress of spring 54, sliding column 52 rotates in sliding groove 62, causing locking member 50 to swing to the first position. At this time, the protrusion 501 on locking member 50 engages with the locking groove 31 closest to the first end 301 or is located on the side of locking groove 31 close to the first end 301. Finally, the waist support 70 is moved forward to the desired position, and the first movable seat 30 moves a certain distance away from the second end 401, so that the protrusion 501 of locking member 50 is engaged in the corresponding locking groove 31, thus completing the rearward adjustment of waist support 70.

[0035] like Figure 9As shown, the locking groove 31 includes a baffle 311 near the first end 301 and an inclined guide wall 312 near the second end 401. The extension direction of the baffle 311 is consistent with the Y direction in the figure, that is, perpendicular to the direction of relative movement of the first movable seat 30 and the second movable seat 40. When the protrusion 501 is placed in the locking groove 31, the protrusion 501 abuts against the baffle 311. The cooperation between the protrusion 501 and the baffle 311 limits the degree of freedom of movement of the baffle 311 toward the second end 401. In this way, stable support can be provided for the first movable seat 30, which is beneficial to the user's waist. When the lumbar support 70 is subjected to backward pressure, the telescopic mechanism 300 is prevented from contracting abnormally, so that the locking member 50 can stably lock the first movable seat 30 and the second movable seat 40. When the protrusion 501 is placed in the locking groove 31, and the first movable seat 30 moves away from the second end 401, the inclined guide wall 312 can push the protrusion 501 outward from the locking groove 31, so that the protrusion 501 disengages from the locking groove 31. In this way, by utilizing the above structure of the locking groove 31, the locking member and the first movable seat 30 form a one-way motion mechanism.

[0036] For ease of assembly, a mounting groove 41 is provided on the second movable seat 40, and the first movable seat 30 passes through the mounting groove 41. A side cover 60 is detachably fixed on the second movable seat 40, and guide groove 61 and slide groove 62 are both provided on the side cover 60.

[0037] In this invention, the lumbar support 70 includes an outer frame. A front connecting rod 21 and a rear connecting rod 22 are both located between two vertical beams 71 of the outer frame. Both the front connecting rod 21 and the rear connecting rod 22 are inverted V-shapes. The front connecting rod 21, the rear connecting rod 22, and the bottom crossbeam 72 of the outer frame form an accommodating space. A massage mechanism 80 mounted on the outer frame is disposed within this accommodating space. A lower connecting rod 24 is disposed on the inner side of each of the two vertical beams 71 of the outer frame. The two lower connecting rods 24 are respectively disposed on the bottom sides of the front connecting rod 21 and the rear connecting rod 22. The bottom sides of the front connecting rod 21 are hinged to the two lower connecting rods 24, and similarly, the bottom sides of the rear connecting rod 22 are hinged to the two lower connecting rods 24.

[0038] A tension spring 231 is also provided between the front link 21 and the upper link 23. When the parallel four-bar linkage deforms, the tension spring 231 provides damping force.

[0039] In addition, a mounting base 73 is provided on the lumbar support 70. The mounting base 73 is provided with a front limiting wall 732 and a rear limiting wall 733. The front limiting wall 732 is located in front of the rear limiting wall 733 and is offset from the rear limiting wall 733 by a certain distance. A pivot 735 is provided on the mounting base 73. The lower connecting rod 24 is pivotally connected to the mounting base 73 through the pivot 735. A stop part 241 is provided on the lower connecting rod 24, which is located between the front limiting wall 732 and the rear limiting wall 733. The stop part 241 abuts against the rear limiting wall 733. A spring 734 is held between the stop 241 and the front limiting wall 732. The lumbar support 70 is swayably connected to the lower link 24 by a pivot 735. The front limiting wall 732 and the rear limiting wall 733 cooperate with the stop 241 to limit the swing range of the lumbar support 70 relative to the lower link 24. The spring 734 provides elastic support for the lumbar support 70, allowing the lumbar support 70 to swing relative to the lower link 24 within a relatively small range. This allows the lumbar support 70 to adapt to the user's back and further improve the comfort of the seat.

[0040] The seat of this utility model includes the lumbar support assembly of the aforementioned seat. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0041] Finally, it should be noted that the above embodiments are only optional embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A lumbar support assembly for a seat, characterized in that, Includes bracket, front link, rear link, upper link, lower link, telescopic mechanism, and lumbar support; The upper link is fixed to the bracket. The upper end of the front link is hinged to the front end of the upper link. The rear link is located behind the front link and its upper end is hinged to the rear end of the upper link. The lower ends of the front link and the rear link are both hinged to the lower link. The front link, rear link, upper link, and lower link together form a parallel four-bar linkage. The waist support is connected to the lower link. The telescopic mechanism includes a first end hinged to the front link, a second end hinged to the bracket, and a locking member. The locking member is used to lock the first end and the second end to keep the first end and the second end relatively fixed, and to unlock the first end and the second end to allow the first end and the second end to move relative to each other.

2. The lumbar support assembly of the seat as described in claim 1, characterized in that, The telescopic mechanism includes a first movable seat and a second movable seat, which are sleeved together so that they can slide relative to each other; the first movable seat is hinged to the front connecting rod through a first end, and the second movable seat is hinged to the bracket through a second end.

3. The lumbar support assembly of the seat as described in claim 2, characterized in that, A mating part is provided on the first movable seat, the mating part including multiple locking slots, the multiple locking slots being arranged sequentially from the first end to the second end; a locking member is located between the first movable seat and the second movable seat and is movably connected to the second movable seat, so that the locking member can move between a first position engaging with one of the locking slots of the mating part and a second position disengaging from the mating part; an elastic member is provided between the locking member and the second movable seat, the elastic member being used to apply elastic stress to the locking member so that the locking member always maintains the tendency to move towards the first position.

4. The lumbar support assembly of the seat as described in claim 3, characterized in that, The locking member is provided with a tooth for engaging with one of the locking slots when the locking member is in the first position; the tooth engages with the locking slot and is configured to limit the movement of the first movable seat toward the direction of the second end, and to allow the tooth to disengage from the locking slot when the first movable seat moves away from the second end.

5. The lumbar support assembly of the seat as described in claim 4, characterized in that, The first movable seat is provided with a first pushing part, a second pushing part, and a third pushing part; the first pushing part, the mating part, the second pushing part, and the third pushing part are arranged sequentially from the first end to the second end; the second movable seat is provided with a guide groove, which includes a first section and a second section. The extension direction of the first section is consistent with the direction from the first end to the second end, and the second section extends from the end of the first section near the second end towards the mating part; the locking member is provided with a guide post that slides and is embedded in the guide groove; the second pushing part is used to move the first movable seat away from the second end to the second end. When the pushing part contacts the locking member, it pushes the locking member from the first position to the second position so that the guide post slides along the second section of the guide groove to the junction of the second section and the first section; the third pushing part is used to push the locking member towards the first end when the first movable seat moves towards the second end and the third pushing part contacts the locking member so that the guide post slides from the junction of the first section and the second section of the guide groove towards the first end; the first pushing part is used to push the locking member towards the second end when the first movable seat moves towards the second end and the first pushing part contacts the locking member.

6. The lumbar support assembly of the seat as claimed in claim 5, characterized in that, The second movable seat is provided with a slide groove whose extension direction is consistent with the extension direction of the first section of the guide groove. The slide groove is located on the side of the guide groove near the second end. The locking member is provided with a sliding post, which is embedded in the slide groove and configured to slide along the extension direction of the slide groove and to rotate within the slide groove.

7. The lumbar support assembly of the seat as claimed in claim 4, characterized in that, The locking groove includes a baffle wall near the first end and an inclined guide wall near the second end. When the protruding tooth is engaged in the locking groove, the protruding tooth abuts against the baffle wall. The cooperation between the protruding tooth and the baffle wall limits the degree of freedom of the baffle wall to move toward the second end. The inclined guide wall is used to push the protruding tooth out of the locking groove when the first movable seat moves away from the second end.

8. The lumbar support assembly of the seat as claimed in claim 1, characterized in that, The lumbar support includes an outer frame, with a front link and a rear link positioned between two vertical beams of the outer frame. Both the front link and the rear link are inverted V-shapes to form a receiving space between themselves and the bottom crossbeam of the outer frame, within which a massage mechanism mounted on the outer frame is installed.

9. The lumbar support assembly of the seat as claimed in claim 1, characterized in that, A tension spring is installed between the front link and the upper link to pull the front link backward; And / or, a mounting base is provided on the lumbar support, and two limiting walls are provided on the mounting base in a front-rear direction. The mounting base is pivotally connected to the lower connecting rod through a pivot. A stop part is provided on the lower connecting rod between the two limiting walls. The stop part abuts against the limiting wall located on the rear side, and a spring is clamped between the stop part and the limiting wall located on the front side.

10. A seat, characterized in that, Includes the lumbar support assembly of the seat as described in any one of claims 1-9.

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