Chair capable of improving waist comfort

Abstract

The seat capable of improving the waist comfort degree comprises a back supporting piece assembly, a waist supporting piece and a sliding piece, a supporting arm extending forwards is arranged on the back supporting piece assembly, the sliding piece is arranged in a sliding groove of the supporting arm in a sliding mode, the waist supporting piece and the sliding piece are connected in a rotating mode, and a reset piece is arranged between the waist supporting piece and the sliding piece. Therefore, the waist supporting piece can move back and forth along with the sliding piece relative to the back supporting assembly and can also independently rotate relative to the sliding piece and the back supporting assembly. An adjusting supporting assembly is arranged between the sliding piece and the supporting arm and keeps the front-back position of the waist supporting piece, and meanwhile the waist supporting piece rotates on the sliding piece in a self-adaptive mode to be attached to the waist. When the waist leaves the waist supporting piece, the waist supporting piece is reset under the action of the reset piece; whether the waist supporting piece is adjusted back and forth to the comfortable position of different crowds, the waist of the human body is jacked forwards to provide better waist supporting, or the waist supporting piece rotates in a self-adaptive mode to be attached to the waist of the human body, the comfort of the seat for supporting the waist can be well improved.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a chair capable of improving waist comfort. Background Art

[0002] To accommodate different user groups and usage patterns, the chair's lumbar support features seat depth adjustment. This allows for both adaptability to different body types and to the user's posture during work or rest. For example, the forward movement of the lumbar support provides a positive lumbar support, enhancing comfort. Furthermore, to enhance the chair's advantages and further improve the comfort of the lumbar support, the support can adaptively rotate to fit the user's waist.

[0003] There are three main forms of achieving the front and rear displacement of the lumbar support, namely the linear knob form, the rotation form and the complex mechanism form. The three forms have their own characteristics and problems:

[0004] 1. The lumbar support is adjusted by a linear knob, which is mainly connected to the backrest or back support through a threaded rod. Turning the knob moves the threaded rod back and forth, thereby driving the lumbar support to move forward and backward. This type of adjustment requires turning the knob behind the chair back, and the user needs to stand up to adjust it, which is very inconvenient and difficult to operate, as shown in Chinese patent CN202222529161.2.

[0005] 2. The rotational adjustment of the lumbar support mainly relies on the rotation of the lumbar support or the rotation of the lumbar support and the backrest together to achieve the front and back adjustment of the lumbar support. Although it is easy to operate, the front and back displacement of the lumbar support is small, and in particular, the function of the lumbar support's adaptive rotation will be lost, reducing comfort, such as Chinese patents CN202321538058.2 and CN202210972366.X.

[0006] 3. The lumbar support with a complex mechanism mainly realizes the front and rear adjustment of the lumbar support by setting a more complex adjustment support mechanism such as a connecting rod mechanism. This structure is too complicated and will increase the cost, such as Chinese patent CN202211454797.3. Summary of the Invention

[0007] In order to solve the above technical problems, the utility model provides a chair with improved lumbar comfort, comprising a back support assembly, a lumbar support and a sliding member, the back support assembly is provided with a support arm extending forward, the sliding member is slidably arranged in a sliding groove of the support arm, the lumbar support is rotatably connected to the sliding member, and a reset member is provided between the two, so that the lumbar support can move forward and backward relative to the back support assembly together with the sliding member, and can also rotate independently relative to the sliding member and the back support assembly; an adjustment support assembly is provided between the slider and the support arm; when the user's waist leans on the lumbar support, the adjustment support assembly maintains the front and rear position of the lumbar support, and the lumbar support adaptively rotates on the slider to fit the waist; when the user's waist leaves the lumbar support, the lumbar support is reset and rotated to face forward under the action of the reset member; whether the lumbar support is adjusted forward and backward to a comfortable position for different people, or the front pushes the human waist to provide better lumbar support, or the lumbar support adaptively rotates to fit the human waist, the comfort of the seat's lumbar support can be well improved, thereby enhancing market competitiveness.

[0008] The technical solution of the present utility model is achieved as follows:

[0009] A chair for improving lumbar comfort includes a back support assembly, a lumbar support member and a sliding member. The back support assembly has a support arm extending forward, the support arm is provided with a sliding groove for accommodating the sliding member, and the sliding member is slidably arranged in the sliding groove; the lumbar support member is rotatably connected to the sliding member, a reset member is provided between the sliding member and the lumbar support member, and the reset member is configured to always provide the lumbar support member with a force for restoring and rotating; an adjustment support assembly is provided between the sliding member and the support arm, and the adjustment support assembly is configured to support the sliding member to stay in different positions of the sliding groove to support the lumbar support member in the front and rear directions.

[0010] When the user's waist leans on the lumbar support, the support assembly is adjusted to maintain the front and rear position of the lumbar support, and the lumbar support adaptively rotates on the sliding member to fit the waist; when the user's waist leaves the lumbar support, the lumbar support is reset and rotated to face forward under the action of the reset member.

[0011] In this solution, the adjustment support assembly is used to adjust the front and rear position of the lumbar support and support the lumbar support after it is moved; the function of the reset member is to, on the one hand, cushion the adaptive rotation of the lumbar support and improve comfort, and on the other hand, reset the lumbar support after the waist leaves the lumbar support; whether the lumbar support is adjusted front and back to a comfortable position for different people, or it is pressed forward to provide better lumbar support for the human waist, or the lumbar support is adaptively rotated to fit the human waist, it can greatly improve the comfort of the seat's lumbar support, thereby enhancing market competitiveness.

[0012] In addition, the support arm points straight forward, and the displacement of the sliding member is used to adjust the lumbar support member in the front-to-back direction. The lumbar support member moves only and directly in the front-to-back direction, and will not cause loss of travel due to displacement in other directions such as rotation, so that this solution can achieve a larger travel.

[0013] Preferably, the support arm and the sliding member are arranged in a front-to-back direction. The adjustable support assembly includes a shift portion and a resilient swing lever. The shift portion is disposed on one of the support arm or the sliding member, and the swing lever is disposed on the other of the support arm or the sliding member. A locking member extends from the head of the swing lever toward the shift portion. The shift portion is provided with a plurality of shift slots spaced apart in the front-to-back direction. When the lumbar support member moves forward and backward, the swing lever deforms and the locking member switches between different shift slots. The elasticity of the swing lever enables the locking member to switch between different shift slots. The coordination of the plurality of shift slots and the swing lever allows the lumbar support member to stay in different positions, thereby meeting the lumbar support requirements of people of different body shapes and postures.

[0014] Preferably, a reciprocating ring groove is further provided on the outside of the shift portion, the reciprocating ring groove being connected to the shift groove, and the reciprocating ring groove is configured so that the locking member enters the different shift grooves after passing through the reciprocating ring groove. The reciprocating ring groove is provided on the same component as the shift portion, such as a sliding member; the reciprocating ring groove surrounds the shift portion and is connected to the shift groove, and the locking member can slide in the reciprocating ring groove and is always located in the reciprocating ring groove or the shift groove, thereby determining the movement path of the locking member.

[0015] Preferably, the swinging member is arranged on the support arm, the gear portion is arranged on the sliding member, the support arm has a retaining portion, the retaining portion clamps the swinging member and is retained in the middle of the gear portion under the elastic action of the swinging member; the gear portion has a starting portion at the front end and a reset portion at the rear end, the reset portion has a reset inclined surface inclined from top to bottom and forward, and the reset portion is configured so that when the locking member is located on the reset inclined surface and the lumbar support member moves backward, the locking member passes over the gear groove from below the gear portion in the reciprocating annular groove and comes to the starting portion. The retaining portion clamps a part of the swinging member so that the unclamped swinging member can still be elastically deformed, and after the deformation is restored, the retaining portion retains the locking member of the swinging member in the middle of the gear portion, thereby facilitating the movement of the locking member in the reciprocating ring groove and the gear groove, and also indirectly stipulates the movement trajectory of the locking member; the reciprocating ring groove is annular, allowing the locking member to switch between different gear grooves when moving backward in the reciprocating ring groove of the upper part, that is, the lumbar support member moves forward, allowing the locking member to slide directly and unimpeded to the starting part when moving forward in the reciprocating ring groove of the lower part, that is, the lumbar support member moves backward, and realizes the reciprocating motion of the locking member and the front and back adjustment of the lumbar support member.

[0016] Preferably, the shift slot is tilted in the vertical direction to ensure that the locking member will not leave the shift slot due to the backward force exerted by the back on the lumbar support member after entering the shift slot, thereby maintaining the lumbar support member in the current position and achieving stable support. In this embodiment, the shift slot is tilted from top to bottom and forward.

[0017] Preferably, the reset member is a torsion spring, with its central axis arranged in the left-right direction. The torsion spring has two torsion arms extending axially, one of which is inserted into the lumbar support member and the other into the sliding member. When the lumbar support member rotates backward, the torsion spring deforms, thereby providing a buffer for the rotation of the lumbar support member. When the person's waist leaves the lumbar support member, the elastic force of the torsion spring resets the lumbar support member.

[0018] Preferably, the lumbar support is rotatably connected to the front end of the sliding member. The lumbar support has a hollow rotating seat. A convex column is protruded from the rotating seat toward the sliding member. The convex column is rotatably connected to the sliding member through a rotating shaft. The torsion spring is sleeved on the convex column.

[0019] Preferably, the rotating seat has a rotating groove, and the sliding member has a stopper protruding toward the rotating groove. The stopper is located in the rotating groove and is shorter than the length of the rotating groove. Both the rotating groove and the stopper have an arc. When the lumbar support member rotates, the stopper rotates in the rotating groove. The angle defined by the gap between the stopper and the rotating groove is the maximum rotation angle of the lumbar support member. In this embodiment, the maximum rotation angle of the lumbar support member is 15°.

[0020] Preferably, the back support assembly includes a backrest and a back bracket, the backrest is arranged on the back bracket, and the support arm is arranged on the back bracket and is located below the backrest.

[0021] Preferably, there are two supporting arms, which are spaced apart and arranged parallel to each other on the back support. This solution can make the supporting capacity of the lumbar support more stable, so that the lumbar support can maintain stable support even with a larger forward and backward displacement.

[0022] Preferably, the sliding groove is provided with a plurality of ridges spaced apart in the vertical direction and extending in the front-to-back direction. The ridges contact the sliding member to reduce the contact area, making the sliding member slide more smoothly and making adjustment of the lumbar support easier. The lumbar support can be adjusted by simply pulling the lumbar support member forward.

[0023] Preferably, a guide bar is protruded in the sliding groove, the limit bar protrudes upward and / or downward, the sliding member is provided with a guide groove, and the guide bar is inserted into the guide groove. The guide groove and the guide bar cooperate to guide the sliding of the sliding member, and both the guide bar and the guide groove extend in the front-to-back direction.

[0024] Preferably, the slider and the support arm are both elongated. Their lengths are similar, and their combined lengths determine the maximum length of the shift portion. The length of the shift portion, in turn, determines the stroke of the lumbar support. To ensure a greater stroke and support stability, the shift portion's length ranges from 42-50 mm. In this embodiment, the lumbar support has a stroke of 45 mm.

[0025] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0026] When the user's waist leans on the lumbar support, the support assembly is adjusted to maintain the front and rear position of the lumbar support, and the lumbar support adaptively rotates on the sliding member to fit the waist; when the user's waist leaves the lumbar support, the lumbar support is reset and rotated to face forward under the action of the reset member.

[0027] In this solution, the adjustment support assembly is used to adjust the front and rear position of the lumbar support and support the lumbar support after it is moved; the function of the reset member is to, on the one hand, cushion the adaptive rotation of the lumbar support and improve comfort, and on the other hand, reset the lumbar support after the waist leaves the lumbar support; whether the lumbar support is adjusted front and back to a comfortable position for different people, or it is pressed forward to provide better lumbar support for the human waist, or the lumbar support is adaptively rotated to fit the human waist, it can greatly improve the comfort of the seat's lumbar support, thereby enhancing market competitiveness.

[0028] In addition, the support arm points straight forward, and the displacement of the sliding member is used to adjust the lumbar support member in the front-to-back direction. The lumbar support member moves only and directly in the front-to-back direction, and will not cause loss of travel due to displacement in other directions such as rotation, so that this solution can achieve a larger travel. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of the lumbar support member located at the rear in the embodiment of the present invention. Figure 1 ;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the lumbar support member located at the rear in the embodiment of the present invention. Figure 2 ;

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of the embodiment of the present invention in which the waist support member is located at the front;

[0032] Figure 4 This is a side view of the embodiment of the present invention with the lumbar support member located at the rear;

[0033] Figure 5 This is a side view of the embodiment of the present invention with the lumbar support member located at the front;

[0034] Figure 6 This is a schematic diagram of the three-dimensional structure of the locking member in the reciprocating ring groove in the embodiment of the present utility model;

[0035] Figure 7 This is a schematic diagram of the three-dimensional structure of the lumbar support member and the sliding member being rotatably connected in an embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram of the three-dimensional structure of the torsion spring provided on the boss in the embodiment of the present invention;

[0037] Figure 9 for Figure 3 A partial enlarged view of part A in the middle;

[0038] Figure 10 for Figure 3 A partial enlarged view of part B in the middle.

[0039] The figures are marked as follows: back support assembly 1; backrest 101; back bracket 102; lumbar support member 2; sliding member 3; support arm 4; sliding groove 5; reset member, torsion spring 6; gear portion 7; starting portion 71; reset portion 72; swing rod 8; locking member 81; retaining portion 9; avoidance groove 10; avoidance hole 11; gear groove 12; reciprocating ring groove 13; rotating seat 14; boss 15; rotating groove 16; limit block 17; convex strip 18; guide strip 19; guide groove 20. DETAILED DESCRIPTION

[0040] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0042] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0043] The specific implementation of the utility model is as follows:

[0044] like Figure 1-5As shown, the utility model provides a chair for improving lumbar comfort, including a back support assembly 1, a lumbar support member 2 and a sliding member 3. The back support assembly 1 has a support arm 4 extending forward, and the support arm 4 is provided with a sliding groove 5 for accommodating the sliding member 3, and the sliding member 3 is slidably set in the sliding groove 5; the lumbar support member 2 is rotatably connected to the sliding member 3, and a reset member 6 is provided between the sliding member 3 and the lumbar support member 2, and the reset member 6 is configured to always give the lumbar support member 2 a force to reset and rotate; an adjustment support assembly is provided between the sliding member 3 and the support arm 4, and the adjustment support assembly is configured to support the sliding member 3 to stay in different positions of the sliding groove 5 to support the lumbar support member 2 in the front and rear directions.

[0045] When the user's waist leans on the lumbar support 2, the support assembly is adjusted to maintain the front and rear position of the lumbar support 2, and at the same time the lumbar support 2 adaptively rotates on the sliding member 3 to fit the waist; when the user's waist leaves the lumbar support 2, under the action of the reset member 6, the lumbar support 2 is reset and rotated to face forward.

[0046] In this solution, the adjustment support assembly is used to adjust the front and rear position of the lumbar support 2 and support the lumbar support 2 after it moves; the function of the reset member 6 is, on the one hand, to cushion the adaptive rotation of the lumbar support 2 and improve comfort, and on the other hand, to reset the lumbar support 2 after the waist leaves the lumbar support 2; whether the lumbar support 2 is adjusted front and back to a comfortable position for different people, or it is pushed forward to provide better lumbar support for the human waist, or the lumbar support 2 is adaptively rotated to fit the human waist, it can greatly improve the comfort of the seat's lumbar support, thereby enhancing market competitiveness.

[0047] In addition, the support arm 4 faces straight forward, and the displacement of the sliding member 3 is used to adjust the lumbar support member 2 in the front-to-back direction. The lumbar support member 2 only moves directly in the front-to-back direction, and will not cause loss of travel due to displacement in other directions due to rotation, etc., so that this solution can achieve a larger travel.

[0048] Specifically, if Figure 1-3 As shown, the back support assembly 1 includes a backrest 101 and a back bracket 102, the backrest 101 is arranged on the back bracket 102, and the support arm 4 is arranged on the back bracket 102 and is located below the backrest 101; there are two support arms 4, the two support arms 4 are arranged on the back bracket 102 at a left and right interval and in parallel, and the support arms 4 are located at the left and right ends of the lumbar support 2, and the two sliding members 3 are respectively arranged on the two support arms 4, and the two sliding members 3 are respectively rotatably connected to the left and right ends of the lumbar support 2; the use of this solution can make the supporting capacity of the lumbar support 2 more stable, so that the lumbar support 2 can maintain stable support even when it has a larger forward and backward displacement.

[0049] Furthermore, the support arms 4 and the sliding members 3 are arranged in the front-to-back direction, and a set of adjustment support components are provided between each support arm 4 and the sliding member 3. The adjustment support components include a shift portion 7 and an elastic swing rod 8. The shift portion 7 is provided on one of the support arms 4 or the sliding member 3, and the swing rod 8 is provided on the other of the support arms 4 or the sliding member 3. In this embodiment, Figure 3 、 6 As shown in Figures 10, the shift member is arranged on the sliding member 3, and the swing rod 8 is arranged on the support arm 4; the head of the swing rod 8 extends toward the shift portion 7 with a locking member 81, the support arm 4 has a holding portion 9, the holding portion 9 has a groove, the tail of the swing rod 8 is arranged in the groove of the holding portion 9, and the front of the holding portion 9 has an avoidance groove 10, the swing rod 8 can swing in the avoidance groove 10, and the avoidance groove 10 is further provided with an avoidance hole 11 that passes through the rotating member. The avoidance hole 11 is located at the head position of the swing rod 8, and the locking member 81 passes through the avoidance hole. 11 to the gear portion 7; the gear portion 7 is provided with a plurality of gear slots 12 arranged at intervals along the front-to-back direction. When the lumbar support member 2 moves forward and backward, the swing rod 8 is deformed and the locking member 81 switches between different gear slots 12; the gear slot 12 is tilted in the up and down directions to ensure that the locking member 81 will not leave the gear slot 12 after entering the gear slot 12 due to the backward force applied to the lumbar support member 2 by the back, so as to keep the lumbar support member 2 in the current position and achieve stable support; in this embodiment, the gear slot 12 is tilted from top to bottom and forward.

[0050] The outer side of the gear portion 7 is further provided with a reciprocating ring groove 13, which is connected to the gear groove 12. The reciprocating ring groove 13 is configured so that the locking member 81 enters the different gear grooves 12 after passing through the reciprocating ring groove 13; the holding portion 9 clamps the swing member and is held in the middle of the gear portion 7 under the elastic action of the swing member; the gear portion 7 has a starting portion 71 at the front end and a reset portion 72 at the rear end, the reset portion 72 has a reset slope inclined from top to bottom and forward, and the reset portion 72 is configured so that when the locking member 81 When the lumbar support member 2 is located on the reset inclined surface and moves backward, the locking member 81 passes over the shift groove 12 from below the shift portion 7 in the reciprocating annular groove 13 and reaches the starting portion 71; the starting portion 71 also has an inclined surface. When in the starting position, that is, when the lumbar support member 2 is at the rearmost position, the locking member 81 is on the inclined surface of the starting portion 71, and the inclined surface is also inclined from top to bottom and forward. When the lumbar support member 2 moves forward, the locking member 81 moves toward the upper half of the reciprocating annular groove 13 under the action of the inclined surface.

[0051] The swing lever 8 is elastic so that the locking member 81 can switch between different gear slots 12. The cooperation between several gear slots 12 and the swing lever 8 enables the lumbar support member 2 to stay in different positions, thereby meeting the lumbar support requirements of people of different body shapes and different body postures; the reciprocating ring groove 13 is arranged on the same component as the gear portion 7, such as both are arranged on the sliding member 3; the reciprocating ring groove 13 surrounds the gear portion 7 and is connected to the gear slot 12, and the locking member 81 can slide in the reciprocating ring groove 13, and the locking member 81 is always in the reciprocating ring groove 13 or the gear slot 12, which determines the movement path of the locking member 81.

[0052] In addition, the retaining portion 9 clamps a part of the swinging member so that the unclamped swinging member can still be elastically deformed, and after the deformation is restored, the retaining portion 9 retains the locking member 81 of the swinging member in the middle of the gear portion 7, thereby facilitating the movement of the locking member 81 in the reciprocating ring groove 13 and the gear groove 12, and also indirectly stipulates the movement trajectory of the locking member 81; the reciprocating ring groove 13 is annular, allowing the locking member 81 to switch between different gear grooves 12 when moving backward in the reciprocating ring groove 13 of the upper half, that is, the lumbar support member 2 moves forward, allowing the locking member 81 to slide directly and unimpeded to the starting portion 71 when moving forward in the reciprocating ring groove 13 of the lower half, that is, the lumbar support member 2 moves backward, and realizes the reciprocating movement of the locking member 81 and the front and back adjustment of the lumbar support member 2.

[0053] Furthermore, if Figure 7-9 As shown, the lumbar support member 2 is rotatably connected to the front end portion of the sliding member 3. The lumbar support member 2 has a hollow rotating seat 14. A boss 15 is protruded from the rotating seat 14 toward the sliding member 3. The boss 15 is rotatably connected to the sliding member 3 through a rotating shaft. The reset member 6 is a torsion spring 6. The central axis of the torsion spring 6 is arranged in the left-right direction. The torsion spring 6 is sleeved on the boss 15. The torsion spring 6 has two torsion arms extending along the axial direction. The two torsion arms are respectively inserted into the lumbar support member 2 and the sliding member 3. When the lumbar support member 2 rotates backward, the torsion spring 6 is deformed and at the same time provides a buffer for the rotation of the lumbar support member 2. When the human waist leaves the lumbar support member 2, the elastic force of the torsion spring 6 resets the lumbar support member 2.

[0054] A rotation groove 16 is formed on the rotation seat 14, and a limit block 17 is protruded toward the rotation groove 16 on the sliding member 3. The limit block 17 is located in the rotation groove 16 and the length of the limit block 17 is less than the length of the rotation groove 16; the rotation groove 16 and the limit block 17 both have an arc. When the lumbar support member 2 rotates, the limit block 17 rotates in the rotation groove 16. The angle of the gap between the limit block 17 and the rotation groove 16 is the maximum rotation angle of the lumbar support member 2. In this solution, the maximum rotation angle of the lumbar support member 2 is 15°.

[0055] The sliding groove 5 is formed by the outer surface of the support arm 4 being concave from the outside to the inside, and the parts of the support arm 4 located on the upper and lower sides of the sliding groove 5 and protruding outward are the tracks of the sliding member 3; a number of convex strips 18 are arranged at intervals along the up and down directions are provided in the sliding groove 5, and the convex strips 18 extend along the front and back directions; two guide strips 19 are also protruded in the sliding groove 5, and the two limit strips protrude upward and downward respectively, and a guide groove 20 is provided on the sliding member 3, and the guide strip 19 is inserted into the guide groove 20; the convex strip 18 contacts the sliding member 3 to reduce the contact area, so that the sliding of the sliding member 3 is smoother, and the adjustment of the lumbar support member 2 is easier, and the lumbar support member 2 can be adjusted by gently pulling the lumbar support member 2 forward; the guide groove 20 and the guide strip 19 cooperate to guide the sliding of the sliding member 3, and the guide strip 19 and the guide groove 20 both extend along the front and back directions.

[0056] The sliding member 3 and the support arm 4 are both long strips, and the length of the sliding member 3 and the support arm 4 is similar. The length of the two determines how long the length of the gear portion 7 can be; and the length of the gear portion 7 determines the size of the stroke of the lumbar support member 2. In order to ensure a larger stroke and support stability, the length range of the gear portion 7 is 42-50mm. In this solution, the stroke of the lumbar support member 2 is 45mm.

Claims

1. A chair for improving waist comfort, characterized by: The back support assembly comprises a back support member, a waist support member and a sliding member. The back support assembly has a support arm extending forward, and the support arm is provided with a sliding groove for accommodating the sliding member, and the sliding member is slidably arranged in the sliding groove; the waist support member is rotatably connected to the sliding member, and a reset member is provided between the sliding member and the waist support member, and the reset member is configured to always give the waist support member a force to reset and rotate; an adjustment support assembly is provided between the sliding member and the support arm, and the adjustment support assembly is configured to support the sliding member to stay in different positions of the sliding groove to support the waist support member in the front and rear directions.

2. The seat for improving waist comfort according to claim 1, characterized in that: The support arm and the sliding member are both arranged in the front-to-back direction. The adjustment support assembly includes a gear portion and an elastic swing rod. The gear portion is arranged on one of the support arm or the sliding member, and the swing rod is arranged on the other of the support arm or the sliding member. A locking member is extended from the head of the swing rod toward the gear portion. The gear portion is provided with a plurality of gear slots arranged at intervals along the front-to-back direction. When the lumbar support member moves forward and backward, the swing rod is deformed and the locking member switches between different gear slots.

3. The seat for improving waist comfort according to claim 2, characterized in that: A reciprocating ring groove is further provided on the outside of the gear portion, which is connected to the gear groove. The reciprocating ring groove is configured so that the locking member enters into different gear grooves after passing through the reciprocating ring groove.

4. The seat for improving lumbar comfort according to claim 3, characterized in that: The swinging member is arranged on the support arm, and the gear part is arranged on the sliding member. The support arm has a holding part, which clamps the swinging member and is held in the middle of the gear part under the elastic action of the swinging member; the gear part has a starting part at the front end and a reset part at the rear end, and the reset part has a reset inclined surface inclined from top to bottom and forward. The reset part is configured so that when the locking member is located on the reset inclined surface and the lumbar support member moves backward, the locking member passes over the gear groove from below the gear part in the reciprocating annular groove and comes to the starting part.

5. The seat for improving lumbar comfort according to claim 2, characterized in that: The gear slot is tilted in the up and down directions.

6. The chair for improving lumbar comfort according to claim 1, characterized in that: The reset member is a torsion spring, the central axis of the torsion spring is arranged in the left-right direction, and the torsion spring has two torsion arms extending along the axial direction. The two torsion arms are respectively inserted in the waist support member and the sliding member.

7. The seat for improving lumbar comfort according to claim 6, characterized in that: The lumbar support is rotatably connected to the front end of the sliding member. The lumbar support has a hollow rotating seat. A convex column is protruded from the rotating seat toward the sliding member. The convex column is rotatably connected to the sliding member through a rotating shaft. A torsion spring is sleeved on the convex column.

8. The seat for improving lumbar comfort according to claim 7, characterized in that: A rotating groove is provided on the rotating seat, and a limiting block is protruded toward the rotating groove on the sliding member. The limiting block is located in the rotating groove and the length of the limiting block is smaller than the length of the rotating groove.

9. The chair for improving lumbar comfort according to claim 1, characterized in that: The back support assembly comprises a backrest and a back bracket. The backrest is arranged on the back bracket. The support arm is arranged on the back bracket and is located below the backrest.

10. The chair for improving lumbar comfort according to claim 9, characterized in that: There are two supporting arms, which are spaced apart and arranged in parallel on the back support.

11. The chair for improving lumbar comfort according to claim 1, characterized in that: A plurality of convex strips are arranged at intervals along the up-down direction in the sliding groove, and the convex strips extend along the front-back direction.

12. The chair for improving lumbar comfort according to claim 1, characterized in that: A guide bar is protruded in the sliding groove, the limit bar protrudes upward and / or downward, the sliding member is provided with a guide groove, and the guide bar is inserted in the guide groove.

13. The chair for improving lumbar comfort according to claim 1, characterized in that: The sliding part and the supporting arm are both in the shape of long strips.

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