Adjustable waist support for seat and seat

Abstract

The utility model discloses an adjustable waist support for a seat and the seat, and belongs to the technical field of seats, the adjustable waist support comprises a waist support body, a connecting piece used for being connected with a seat back of the seat, a sliding piece arranged on the connecting piece in a sliding manner and fixedly connected with the waist support body, an elastic piece arranged between the connecting piece and the sliding piece, and a locking mechanism, the elastic piece applies pressure to the connecting piece and the sliding piece in the mode that the connecting piece and the sliding piece tend to be away from each other. The locking mechanism comprises a locking piece and a driving piece, and the driving piece is configured to act under the action of external force and drive the locking piece to be switched between a locking position and an unlocking position; the sliding piece is fixed relative to the connecting piece when the locking piece is located at the locking position, and the sliding piece can slide in the front-back direction relative to the connecting piece when the locking piece is located at the unlocking position. According to the application, the front-back position of the waist support body relative to the chair back can be conveniently adjusted according to the use requirement of a user.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to an adjustable lumbar support for seats and the seat. Background Art

[0002] To enhance user comfort, office chairs, gaming chairs, and other chairs are often equipped with lumbar supports, providing support for the user's lower back and relieving back fatigue. To accommodate users of varying body shapes, some chairs feature lumbar supports that can be adjusted forward and backward. Related art generally employs two methods for adjusting the lumbar support position: manual and automatic. Automatic adjustment typically utilizes a drive motor, controlled by a pre-set program to drive the lumbar support to the desired position. This solution is costly, and the motor takes up significant space, increasing the overall size of the chair. Manual adjustment typically requires a locking mechanism. To adjust the lumbar support, the user must unlock the locking mechanism with one hand, push and pull the support with the other hand to move it to the desired position, and then lock the position again. For users, leaning against the lumbar support makes it easier to find the ideal position for their lumbar support. Manual adjustment, however, requires both hands, making it difficult to maintain a normal sitting position with the lumbar support. Therefore, manual adjustment is inconvenient. In addition, the locking mechanism designed for the manual adjustment solution in the related art is prone to wear and damage after long-term use. Utility Model Content

[0003] The purpose of the utility model is to provide an adjustable lumbar support for a seat and a seat, which can conveniently adjust the front and rear position of the lumbar support body according to the user's needs.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: an adjustable lumbar support for a seat, comprising a lumbar support body, the adjustable lumbar support further comprising:

[0005] A connecting piece for connecting to a seat back;

[0006] a sliding member, which is slidably disposed on the connecting member and fixedly connected to the lumbar support body;

[0007] an elastic member disposed between the connecting member and the sliding member and applying pressure to the connecting member and the sliding member so that the connecting member and the sliding member tend to move away from each other; and

[0008] A locking mechanism comprising a locking member and a driving member, wherein the driving member is configured to be actuated under an external force and to drive the locking member to switch between a locked position and an unlocked position;

[0009] Wherein, the sliding member is fixed relative to the connecting member when the locking member is in the locking position, and the sliding member can slide relative to the connecting member in the front-rear direction when the locking member is in the unlocking position.

[0010] Preferably, the sliding member is formed with a rack extending in the front-to-back direction, and the locking member is formed with a latch matched with the rack, the latch engages with the rack when the locking member is in the locked position, and the latch is separated from the rack when the locking member is in the unlocked position.

[0011] Preferably, the connecting member has a shell structure and a slide is formed in the shell structure, the sliding member extends into the slide and the two are slidably matched, the locking member is arranged on the outside of the shell structure, and the shell structure is provided with an opening on the side facing the locking member, the locking member extends into the slide from the opening and can move along a predetermined direction under the drive of the driving member to drive the latch tooth to engage and disengage relative to the rack, and the predetermined direction is perpendicular to the front-to-back direction.

[0012] Preferably, the outer wall of the shell structure is formed with a flange, the inner wall of the flange forms a limiting channel, the locking member is arranged in the limiting channel and can move along the predetermined direction under the limiting action of the limiting channel.

[0013] Preferably, the driving member includes an eccentric wheel and a pressure handle formed into an integral structure, and the driving member is rotatably mounted on the inner wall of the flange via a rotating shaft passing through the eccentric wheel;

[0014] The pressure handle can drive the driving member to swing around the rotating shaft under the action of an external force to switch between a locked state and an unlocked state. The eccentric wheel applies pressure to the locking member during the process of switching the driving member from the unlocked state to the locked state, causing the locking member to switch to the locked position.

[0015] A reset member is further provided between the locking member and the housing structure. The reset member applies pressure to the locking member during the process of the driving member switching from the locked state to the unlocked state, causing the locking member to switch to the unlocked position.

[0016] Preferably, the locking member includes a pressing block and bent plates arranged on both sides of the pressing block, the latching teeth are formed on a surface of the pressing block facing the rack, and the reset member is located in the limiting channel and is arranged between the bent plates and the housing structure;

[0017] The eccentric wheel is kept tilted relative to the pressure block when the driving member is in a locked state, so that the pressed handle is pressed against the end of the flange on one side under the pressure of the reset member.

[0018] Preferably, the connecting member includes a connecting base plate for installation with the chair back and a connecting sleeve formed on the connecting base plate, the sliding member includes a connecting substrate and a sliding sleeve formed on the connecting substrate, the lumbar support body is fixedly installed on the connecting substrate, the sliding sleeve extends into the connecting sleeve and the two are slidably matched.

[0019] Preferably, the sliding sleeve is provided with a long hole extending in the front-to-back direction, the connecting sleeve is provided with a through hole aligned with the long hole, and the adjustable lumbar support further comprises a limiting shaft fixedly arranged in the through hole and extending into the long hole, and the limiting shaft is used to cooperate with the front and rear inner walls of the long hole along the front-to-back direction to limit the moving stroke of the sliding sleeve.

[0020] Preferably, the elastic member is a compression spring, the connecting base plate is formed with a first positioning column extending into the connecting sleeve, the connecting substrate is formed with a second positioning column extending into the sliding sleeve, one end of the compression spring is sleeved outside the first positioning column and abuts against the connecting base plate, and the other end of the compression spring is sleeved outside the second positioning column and abuts against the connecting substrate.

[0021] In addition, to achieve the above purpose, the present invention also adopts the following technical solutions:

[0022] A seat, comprising a chair back, further comprising an adjustable lumbar support as described in any one of the above technical solutions, wherein the adjustable lumbar support is mounted on the chair back via the connecting member.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The lumbar support body is slidably connected to a connecting piece mounted on the chair back via a sliding piece. When the locking piece is in the unlocked position, the lumbar support body can be adjusted forward and backward relative to the chair back by sliding the sliding piece. After the lumbar support body reaches the target position, the sliding piece is locked relative to the connecting piece via the locking piece, and the lumbar support body is fixed relative to the chair back. During operation, the user can maintain a normal sitting posture and lean their waist against the lumbar support body. They only need to operate the driving piece with one hand to drive the locking piece to switch between the locked position and the unlocked position. The pressure applied by the user's waist to the lumbar support body and the pressure applied by the elastic piece to the sliding piece are used to drive the lumbar support body, so that the lumbar support body can adaptively move to the target position that meets the user's expectations without having to push or pull the lumbar support body by hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of an adjustable lumbar support for a seat provided in an embodiment of the present application;

[0026] Figure 2 This is an exploded view of the adjustable lumbar support;

[0027] Figure 3 is a structural diagram of the connecting piece;

[0028] Figure 4 It is a structural schematic diagram of the sliding member;

[0029] Figure 5 is a cross-sectional view of the adjustable lumbar support when the locking member is in a locked position and the driving member is in a locked state;

[0030] Figure 6 A schematic diagram of the position change of the eccentric wheel of the adjustable lumbar support when the locking member switches from the locked position to the unlocked position;

[0031] Figure 7 is a cross-sectional view of the adjustable lumbar support when the locking member is in the unlocked position and the driving member is in the unlocked state;

[0032] Figure 8 The figure is a structural diagram of installing the adjustable lumbar support on the backrest of a seat.

[0033] Among them, 1. lumbar support body; 2. connecting part; 20. connecting base plate; 200. first positioning column; 21. connecting sleeve; 210. opening; 211. flange; 212. perforation; 3. sliding part; 30. connecting base plate; 300. second positioning column; 31. sliding sleeve; 310. rack; 311. long hole; 4. elastic part; 5. locking part; 50. pressure block; 500. latching tooth; 51. bending plate; 6. driving part; 60. pressure handle; 61. eccentric wheel; 7. reset part; 8. chair back. DETAILED DESCRIPTION

[0034] Below, the present invention is further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Unless otherwise specified, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and cannot be understood as limiting this application.

[0035] In the description of this application, it should be understood that the terms "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, a connection through an intermediary medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0037] This embodiment provides an adjustable lumbar support for a chair, such as Figure 1 and Figure 2 As shown in the figure, the adjustable lumbar support comprises a lumbar support body 1, a connector 2, a slider 3, an elastic member 4, and a locking mechanism. The connector 2 is connected to the seat back, the slider 3 is mounted on the connector 2 and can slide back and forth relative to the connector 2, and the lumbar support body 1 is fixedly connected to the slider 3. As the slider 3 slides back and forth relative to the connector 2, it drives the lumbar support body 1 to move back and forth relative to the seat back, allowing the lumbar support body 1 to be adjusted forward and backward relative to the seat back.

[0038] The locking mechanism includes a locking member 5 and a driving member 6. The driving member 6 is configured to actuate under the action of an external force and drive the locking member 5 to switch between a locked position and an unlocked position. When the locking member 5 is in the locked position, the sliding member 3 is fixed relative to the connecting member 2. When the locking member 5 is in the unlocked position, the sliding member 3 can slide in the front-to-back direction relative to the connecting member 2. That is, when the locking member 5 is in the unlocked position, the lumbar support body 1 can be adjusted in its front-to-back position relative to the chair back by sliding the sliding member 3. After the lumbar support body 1 reaches the target position, the sliding member 3 is locked relative to the connecting member 2 by the locking member 5, and the lumbar support body 1 is fixed relative to the chair back. By operating the driving member 6, the user can drive the locking member 5 to switch between the unlocked and locked positions, thereby adjusting the front-to-back position of the lumbar support body 1.

[0039] The elastic member 4 is arranged between the connecting member 2 and the sliding member 3 and applies pressure to the two so that the two have a tendency to move away from each other. That is, when the locking member 5 is in the unlocked position, the sliding member 3 can slide back and forth relative to the connecting member 2. At this time, in the absence of external force, the sliding member 3 can slide relative to the connecting member 2 in a direction away from the connecting member 2 (i.e. forward) under the pressure of the elastic member 4, thereby driving the lumbar support body 1 to adjust in a direction away from the chair back (i.e. forward). With the above-described structural design, when the user wants to adjust the position of the lumbar support body 1, the user can maintain a normal sitting posture and lean their waist against the lumbar support body 1. They only need to operate the driving member 6 with one hand to drive the locking member 5 from the locked position to the unlocked position. If the user wants to adjust the lumbar support body 1 backward, the user leans back with force, applying pressure to the lumbar support body 1 with their waist, thereby overcoming the elastic force of the elastic member 4 and causing the lumbar support body 1 to drive the sliding member 3 backward. Conversely, if the user wants to adjust the lumbar support body 1 forward, the user moves their waist forward, and the lumbar support body 1 automatically moves forward under the pressure of the elastic member 4 until the user senses that the lumbar support body 1 has reached the appropriate position. Then, the user applies pressure to the lumbar support body 1 with their waist to offset the pressure of the elastic member 4 and maintain the appropriate position. At this time, the user operates the driving member 6 to drive the locking member 5 from the unlocked position to the locked position, completing the front-back position adjustment of the lumbar support body 1. This process does not require the user to deliberately push or pull the lumbar support body 1 manually, simplifying the operation of adjusting the position of the lumbar support body 1.

[0040] like Figure 2 As shown in FIG, in this embodiment, a rack 310 extending in the front-to-back direction is formed on the sliding member 3, and a latching tooth 500 adapted to the rack 310 is formed on the locking member 5. Figure 5 As shown in FIG, the latch 500 engages with the rack 310 when the locking member 5 is in the locked position; Figure 7 As shown in FIG, the latching teeth 500 are separated from the rack 310 when the locking member 5 is in the unlocked position. In this embodiment, multiple latching teeth 500 are provided to achieve a better locking effect. In alternative embodiments, only one latching tooth 500 may be provided. If the length of the latching tooth 500 reaches a certain value, a single latching tooth 500 can also achieve the desired locking effect. The rack 310 is provided with multiple continuously distributed teeth. A greater number of teeth means a higher adjustment accuracy of the lumbar support body 1. In this embodiment, the spacing between two adjacent teeth (the distance between the tips of the two teeth) is 3 mm. In some alternative embodiments, the spacing between two adjacent teeth can be a selected value between 2.5 mm and 6 mm. The length of the entire rack 310 with the teeth is 12.6 cm, and the adjustable range of the lumbar support body 1 relative to the chair back is approximately 8 cm. It will be readily understood that in alternative embodiments, the length of the rack 310 with the teeth can be other values, and the adjustable range of the lumbar support body 1 relative to the chair back can also be other values.

[0041] Further, combined Figure 3 、 Figure 4 、 Figure 5 and Figure 7 As shown in FIG, the connecting member 2 in this embodiment has a housing structure and a slideway is formed in the housing structure. The sliding member 3 extends into the slideway and the two slide together. The locking member 5 is arranged outside the housing structure. The housing structure is provided with an opening 210 on the side facing the locking member 5. The locking member 5 extends into the slideway through the opening 210 and can move in a predetermined direction under the drive of the driving member 6 to drive the latch 500 to engage or disengage with the rack 310. Figure 5 As shown in FIG, the front-to-back direction is indicated by arrow P, which is the direction of movement of the lumbar support body 1 when adjusting its position relative to the chair back; the predetermined direction is indicated by arrow S, which is perpendicular to the front-to-back direction. With this design, the latch 500 can engage or disengage with the meshing teeth in a direction perpendicular to the rack 310, reducing wear and collision between the latch 500 and the meshing teeth and extending the service life of the locking mechanism.

[0042] The connector 2 in this embodiment includes a connecting base plate 20 for mounting with the chair back and a connecting sleeve 21 formed on the connecting base plate 20. The sliding member 3 in this embodiment includes a connecting base plate 30 and a sliding sleeve 31 formed on the connecting base plate 30. The lumbar support body 1 is fixedly mounted on the connecting base plate 30, and the sliding sleeve 31 extends into the connecting sleeve 21, and the two slide together. In this embodiment, the aforementioned shell structure is the connecting sleeve 21. It is easy to understand that in an optional embodiment, the shell structure in the connector 2 can also be designed as a shell with a U-shaped cross-section. The connector 2 only needs to be able to form a shell structure with a slideway.

[0043] Furthermore, in this embodiment, the outer wall of the connecting sleeve 21 (housing structure) is formed with a flange 211, and the inner wall of the flange 211 forms a limiting channel. The locking member 5 is disposed within the limiting channel and is able to move in a predetermined direction under the restraining action of the limiting channel. In other words, the locking member 5 can be actuated by the driving member 6, and under the action of the limiting channel, the movement of the locking member 5 is limited to linear movement in the predetermined direction.

[0044] Specifically in this embodiment, combined with Figure 5 、 Figure 6 and Figure 7As shown in FIG, the driving member 6 includes an eccentric wheel 61 and a pressure handle 60 formed into an integral structure. The driving member 6 is rotatably mounted on the inner wall of the flange 211 via a rotating shaft passing through the eccentric wheel 61. When a user applies pressure to the pressure handle 60, the driving member 6 can be driven to rotate about the central axis of the rotating shaft. Under the action of an external force, the pressure handle 60 can drive the driving member 6 to swing about the rotating shaft to switch between a locked state and an unlocked state. Accordingly, it can drive the locking member 5 to switch between a locked position and an unlocked position. Specifically, the eccentric wheel 61 applies pressure to the locking member 5 during the process of switching the driving member 6 from the unlocked state to the locked state, causing the locking member 5 to switch to the locked position. A reset member 7 is also provided between the locking member 5 and the housing structure. The reset member 7 applies pressure to the locking member 5 during the process of switching the driving member 6 from the locked state to the unlocked state, causing the locking member 5 to switch to the unlocked position.

[0045] like Figure 5 As shown in , the driving member 6 is in a locked state, the locking member 5 is in a locked position, the latching teeth 500 are engaged with the rack 310, and the lumbar support body 1 remains fixed relative to the chair back. If the user wants to adjust the position of the lumbar support body 1, the pressure handle 60 is pulled, causing the driving member 6 to rotate counterclockwise around the central axis of the rotating shaft. During this process, the eccentric wheel 61 applies pressure to the pressure block 50, causing the pressure block 50 and the sliding sleeve 31 to deform, and then the eccentric wheel 61 continues to rotate, as shown in FIG. Figure 6 As shown in , until its horizontal height value is higher than the height value of the eccentric wheel 61 when the driving member 6 is in the locked state. Under the action of the reset member 7, the locking member 5 moves upward, so that the latching tooth 500 is separated from the rack 310. Figure 7 As shown in , the driving member 6 is in the unlocked state, the locking member 5 is in the unlocked position, the latch 500 is separated from the rack 310, and the lumbar support body 1 can move forward and backward relative to the chair back to adjust the forward and backward position. After adjusting the lumbar support body 1 to the target position, the user presses the pressure handle 60 to rotate the driving member 6 to the position shown in FIG. Figure 5 It is easy to understand that the connecting member 2, the sliding member 3 and the locking member 5 in this embodiment are all made of plastic and can produce a certain elastic deformation under the action of external force.

[0046] It should be noted that during the operation, the Figure 6 As shown in the schematic diagram, during the rotation of the eccentric wheel 61, the locking member 5 is always in contact with the eccentric wheel 61 due to the pressure exerted by the reset member 7. To facilitate the description of the position change of the eccentric wheel 61, Figure 6 In the schematic diagram shown in , the locking member 5 is in a locked state and the driving member 6 is in an unlocked state, thereby illustrating the position change of the eccentric wheel 61 during the process of converting the driving member 6 from a locked state to an unlocked state.

[0047] In this embodiment, the reset member 7 is a compression spring. The locking member 5 includes a pressure block 50 and bent plates 51 disposed on both sides of the pressure block 50. The latching teeth 500 are formed on the side of the pressure block 50 facing the rack 310. The reset member 7 is located within the limiting channel and disposed between the bent plates 51 and the housing structure. In other optional embodiments, the reset member 7 may also be an elastic structure such as a metal spring.

[0048] In the related art, to ensure that the locking mechanism remains locked, a dedicated snap-fit ​​structure is required. This snap-fit ​​structure is used to position the locking mechanism when the lumbar support needs to be locked and secured. However, in this embodiment, the eccentric wheel 61 is configured to remain tilted relative to the pressure block 50 when the driver 6 is in the locked state. This allows the pressure exerted by the reset member 7 on the locking member 5 to be transmitted to the eccentric wheel 61, forcing the pressed handle 60 to abut against the end of the side flange 211. This ensures that the driver 6 remains balanced when in the locked state, without the need for a separate snap-fit ​​structure.

[0049] Combine Figure 3 and Figure 4 As shown in FIG, in this embodiment, a long hole 311 extending in the front-to-back direction is provided on the sliding sleeve 31, and a through-hole 212 aligned with the long hole 311 is provided on the connecting sleeve 21. The adjustable lumbar support further includes a limiting shaft (not shown) fixedly disposed in the through-hole 212 and extending into the long hole 311. The limiting shaft is configured to cooperate with the front and rear inner walls of the long hole 311 in the front-to-back direction to limit the travel of the sliding sleeve 31. By limiting the travel of the sliding sleeve 31, the limiting shaft can prevent the sliding sleeve 31 from falling out of the connecting sleeve 21.

[0050] Combine Figure 2 and Figure 7 As shown in the figure, the elastic member 4 in this embodiment is a compression spring, the connecting base plate 20 is formed with a first positioning column 200 extending into the connecting sleeve 21, and the connecting base plate 30 is formed with a second positioning column 300 extending into the sliding sleeve 31. One end of the compression spring is sleeved outside the first positioning column 200 and abuts against the connecting base plate 20, and the other end of the compression spring is sleeved outside the second positioning column 300 and abuts against the connecting base plate 30.

[0051] like Figure 8 As shown in FIG, the adjustable lumbar support can be applied to a seat including a backrest 8, to which the adjustable lumbar support is mounted via a connector 2. The structure of the backrest 8 can be described with reference to prior art and will not be further described here. The connector 2 can be fixedly mounted on the backrest 8 or can be arranged to be liftable. The mounting method of the connector 2 and the backrest 8 can be described with reference to prior art and will not be further described here.

[0052] Finally, it should be noted that the above-mentioned implementation mode is only an optional embodiment of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. An adjustable lumbar support for a seat, comprising a lumbar support body, characterized in that: The adjustable lumbar support further comprises: A connecting piece for connecting to a seat back; a sliding member, which is slidably disposed on the connecting member and fixedly connected to the lumbar support body; an elastic member disposed between the connecting member and the sliding member and applying pressure to the connecting member and the sliding member so that the connecting member and the sliding member tend to move away from each other; and A locking mechanism comprising a locking member and a driving member, wherein the driving member is configured to be actuated under an external force and to drive the locking member to switch between a locked position and an unlocked position; Wherein, the sliding member is fixed relative to the connecting member when the locking member is in the locking position, and the sliding member can slide relative to the connecting member in the front-rear direction when the locking member is in the unlocking position.

2. The adjustable lumbar support according to claim 1, wherein: The sliding member is formed with a rack extending in the front-rear direction, and the locking member is formed with a latch tooth adapted to the rack. The latch tooth engages with the rack when the locking member is in the locking position, and is separated from the rack when the locking member is in the unlocking position.

3. The adjustable lumbar support according to claim 2, wherein: The connecting member has a shell structure and a slide is formed in the shell structure. The sliding member extends into the slide and the two slide together. The locking member is arranged on the outside of the shell structure. The shell structure is provided with an opening on the side facing the locking member. The locking member extends into the slide from the opening and can move along a predetermined direction under the drive of the driving member to drive the latch to engage and disengage with the rack. The predetermined direction is perpendicular to the front-to-back direction.

4. The adjustable lumbar support according to claim 3, wherein: The outer wall of the shell structure is formed with a flange, the inner wall of the flange forms a limiting channel, the locking member is arranged in the limiting channel and can move along the predetermined direction under the limiting action of the limiting channel.

5. The adjustable lumbar support according to claim 4, characterized in that: The driving member includes an eccentric wheel and a pressure handle formed into an integral structure, and the driving member is rotatably mounted on the inner wall of the flange via a rotating shaft passing through the eccentric wheel; The pressure handle can drive the driving member to swing around the rotating shaft under the action of an external force to switch between a locked state and an unlocked state. The eccentric wheel applies pressure to the locking member during the process of switching the driving member from the unlocked state to the locked state, causing the locking member to switch to the locked position. A reset member is further provided between the locking member and the housing structure. The reset member applies pressure to the locking member during the process of the driving member switching from the locked state to the unlocked state, causing the locking member to switch to the unlocked position.

6. The adjustable lumbar support according to claim 5, characterized in that: The locking member includes a pressing block and a bent plate provided on both sides of the pressing block, the latching teeth are formed on a surface of the pressing block facing the rack, and the reset member is located in the limiting channel and is provided between the bent plate and the housing structure; The eccentric wheel is kept tilted relative to the pressure block when the driving member is in a locked state, so that the pressed handle is pressed against the end of one side flange under the pressure of the reset member.

7. The adjustable lumbar support according to any one of claims 1 to 6, characterized in that: The connecting member includes a connecting base plate for installation with the chair back and a connecting sleeve formed on the connecting base plate. The sliding member includes a connecting substrate and a sliding sleeve formed on the connecting substrate. The lumbar support body is fixedly installed on the connecting substrate. The sliding sleeve extends into the connecting sleeve and the two are slidably matched.

8. The adjustable lumbar support according to claim 7, wherein: The sliding sleeve is provided with a long hole extending in the front-to-back direction, the connecting sleeve is provided with a through hole aligned with the long hole, and the adjustable lumbar support further includes a limiting shaft fixedly arranged in the through hole and extending into the long hole, and the limiting shaft is used to cooperate with the front and rear inner walls of the long hole along the front-to-back direction to limit the moving stroke of the sliding sleeve.

9. The adjustable lumbar support according to claim 7, wherein: The elastic member is a compression spring, the connecting base plate is formed with a first positioning column extending into the connecting sleeve, the connecting substrate is formed with a second positioning column extending into the sliding sleeve, one end of the compression spring is sleeved outside the first positioning column and abuts against the connecting base plate, and the other end of the compression spring is sleeved outside the second positioning column and abuts against the connecting substrate.

10. A seat, including a seat back, characterized in that: The chair further comprises an adjustable lumbar support according to any one of claims 1 to 9, wherein the adjustable lumbar support is mounted on the chair back via the connecting member.

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