Chair back device

Abstract

The utility model provides a chair back device which comprises a back bearing assembly and a waist rest, the back bearing assembly is provided with two track seats which are spaced left and right, a track groove of each track seat is internally provided with a sliding supporting piece, and the sliding supporting pieces can straightly move in the track grooves in the front-back direction; the waist rest comprises a bearing part located in the middle of the waist rest and used for being attached to the waist of the human body and two stress parts located at the left end and the right end of the waist rest and used for providing supporting force, and the two sliding supporting pieces are connected to the two stress parts in parallel. Adjusting and supporting assemblies used for adjusting and supporting the sliding supporting pieces to stay at different positions of the rail groove are arranged between the sliding supporting pieces and the rail base. When the waist of a user leans on the waist rest, the bearing part is attached to and bears the waist, and the two stress parts bear the load given by the waist; when the waist rest moves back and forth, the two sliding supporting pieces synchronously translate in the two rail grooves respectively, and the waist rest horizontally translates back and forth under the guidance of the rail grooves.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a chair back device. Background Art

[0002] In order to adapt to different usage conditions of different groups of people or users, the lumbar support of the seat has the function of adjustment along the seat depth direction; firstly, the seat depth can be adjusted to accommodate people of different body shapes, and secondly, it can adapt to different body postures of users when working or resting. For example, the lumbar support has a supporting effect after moving forward, giving the human waist better support and high comfort; and as to how to make the lumbar support adjustable forward and backward to bring better results and gain more favor and recognition from consumers, the size of the stroke is a key factor.

[0003] Specifically, a larger travel range can accommodate a wider range of people, which can expand the product market and increase revenue. Furthermore, the lumbar support provides better support, and can accommodate a wider range of people who need it. However, existing lumbar support options with fore-and-aft adjustment struggle to achieve adequate results. Furthermore, the lumbar support lacks stability, and even within the intended range, the support loses its original effect due to instability, resulting in reduced comfort. The characteristics of each type of lumbar support are as follows:

[0004] 1. The linear knob type lumbar support is mainly adjusted by a threaded rod connected to the backrest or back support. The knob is turned to move the threaded rod back and forth, thereby driving the lumbar support to move forward and backward. In this form, a single threaded rod is connected to the middle part of the lumbar support, which is exactly aligned with the middle spine position of the human waist. When the waist leans back on this lumbar support, the foreign body sensation caused at the force point is obvious, making the lumbar support feel very "hard" when supporting the waist, and the comfort level is reduced. Moreover, when the force exerted by the waist on the lumbar support is not coordinated on the left and right, it is difficult to stabilize the lumbar support, which weakens the support stability of the lumbar support for the waist and may be damaged. In addition, it is necessary to turn the knob behind the chair back for adjustment, and the user needs to stand up to adjust, which is very inconvenient and troublesome 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 to achieve the adjustment of the lumbar support in the front and rear directions. The lumbar support adjusted in this way is generally connected to the backrest for rotation, or the backrest is connected to the back support for rotation. On the one hand, it causes the lumbar support to rotate when it moves forward and backward, and a large amount of positive displacement is lost, so it generally has only a small stroke; and in terms of support stability, only the upper end of the lumbar support is connected to the backrest, and the middle and lower part of the lumbar support is connected to the adjustment support mechanism, so that the left and right ends of the middle and lower part of the lumbar support are obviously suspended relative to its upper end, without a support point. Therefore, when the left and right forces are unbalanced, the problem of poor support stability is prone to occur, such as Chinese patents CN202321538058.2 and CN202210972366.X.

[0006] 3. The adjustable lumbar support with complex mechanism mainly realizes the front and rear adjustment of the lumbar support by setting up a more complex adjustment support mechanism such as a connecting rod mechanism. Generally speaking, the complex mechanism is also set in the middle of the lumbar support, which makes the middle of the lumbar support have obvious stress changes, poor support stability and the possibility of damage. In addition, the structure is too complicated, which will lead to an increase in cost, such as Chinese patent CN202211454797.3.

[0007] Therefore, how to increase the stroke size and still allow the lumbar support to provide stable support under the large stroke is an urgent problem to be solved. Summary of the Invention

[0008] In order to solve the above-mentioned technical problems, the utility model provides a chair back device, including a back support assembly and a lumbar support, the back support assembly is provided with two track seats spaced left and right, and a sliding support member is provided in the track groove of each track seat, and the sliding support member can move straightly along the front and rear directions in the track groove; the lumbar support includes a supporting part located in the middle part for fitting the human waist and two force-bearing parts located at the left and right ends thereof for providing supporting force, the two sliding supports are connected in parallel to the two force-bearing parts, and an adjustment support assembly for adjusting and supporting the sliding support member to stay in different positions of the track groove is provided between the sliding support member and the track seat; when the user's waist leans on the lumbar support, the supporting part fits and supports the waist, and the two force-bearing parts share the load given by the waist, thereby increasing the support stability and comfort of the lumbar support.

[0009] The technical solution of the present utility model is achieved as follows:

[0010] The two rail seats are provided with a track groove, and the two track grooves face forward in parallel; sliding supports are provided in the track grooves, and the sliding supports are slidably arranged in the track grooves; the lumbar support includes a supporting part located in the middle part for fitting the human waist and two force-bearing parts located at its left and right ends for providing supporting force, and the two sliding supports are respectively connected to the two force-bearing parts of the lumbar support; an adjustment support assembly is provided between the sliding support and the track seat, and the adjustment support assembly is configured to support the sliding support to stay in different positions of the track groove; when the user's waist leans on the lumbar support, the supporting part fits and supports the waist, and the two force-bearing parts share the load given by the waist; when the lumbar support moves forward and backward, the two sliding supports are synchronously translated in the two track grooves, and the lumbar support is translated horizontally forward and backward under the guidance of the track grooves.

[0011] The two track seats form a set of parallel tracks, which support the left and right ends of the lumbar support. They not only increase the support stability in terms of quantity, but more importantly, they are located at the left and right ends of the lumbar support in the connection position, which not only prevents the lumbar support from twisting due to the tilt of the human body, but also firmly stabilizes the left and right ends of the lumbar support, thereby improving its stability.

[0012] In addition to stability, the parallel rails are connected to the left and right ends of the lumbar support, that is, connected to the two force-bearing parts of the lumbar support, and two force points are formed on the two force-bearing parts respectively. The pressure given to the lumbar support by the waist is transmitted to the sliding support via the force points, and the sliding support gives the lumbar support a reaction force for supporting the waist; in this solution, the supporting area formed on the supporting part that fits the human waist is separated from the force points formed on the force-bearing part. When the human waist leans on the lumbar support, the human body will not feel the foreign body sensation caused by the force points. On the contrary, the supporting part will produce a slight deformation to provide cushioning during support, making the lumbar support feel more "soft" when supporting the waist, thereby improving the comfort of use.

[0013] The two tracks are parallel and face forward to provide a guiding effect. This guiding effect allows the lumbar support to move completely forward. Compared with the existing technology, its movement range can be greatly improved and will not be limited by factors such as the rotation angle, so it can adapt to the use of more people.

[0014] Preferably, the lumbar support is a frame structure with a hollow portion, and two sliding supports are connected to the load-bearing portion of the lumbar support in the hollow portion. The sliding supports are connected to the lumbar support through the hollow portion, which can reduce the width, make the structure more compact, and further increase the support stability of the lumbar support.

[0015] Preferably, the two sliding supports are connected at the middle and lower part of the lumbar support in the height direction. When the sliding supports are connected in this manner, the degree of overhang at the lower parts of the left and right ends of the lumbar support can be greatly reduced, further enhancing the ability of the lumbar support to prevent twisting.

[0016] As preferred, the two track seats extend forward in parallel and horizontally and protrude from the back support component. The track seats extend forward horizontally to provide additional support for the sliding support component, making the lumbar support more stable.

[0017] Preferably, the track groove is open forward and closed at the rear end. In the left-right direction, the track groove opens outward from the back support assembly. The closed rear end of the track groove provides rearward positioning for the sliding support member; while the outward opening of the track groove exposes the sliding support member, allowing for intuitive positioning of the sliding support member and enhancing the aesthetics.

[0018] Preferably, two horizontal and parallel slide rails are provided in each of the two track grooves, the slide rails protruding vertically from the track grooves; the slide support member is provided with a guide groove, the slide rails being inserted into the guide groove. The guide groove and the slide rails cooperate to guide the sliding of the slide support member, and both the slide rails and the guide groove extend in the front-to-back direction.

[0019] Preferably, the adjustable support assembly includes a shift portion and a resilient swing lever. The shift portion is mounted on one of the track base or the sliding support member, and the swing lever is mounted on the other of the track base or the sliding support 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 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 combination of the plurality of shift slots and the swing lever allows the lumbar support to stay in different positions, thereby meeting the lumbar support requirements of people of different body shapes and postures.

[0020] 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 both being provided on the sliding support 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.

[0021] Preferably, the swinging member is arranged on the track seat, the gear part is arranged on the sliding support member, the track seat has a retaining part, the retaining part clamps the swinging member and is retained 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, the reset part has a reset inclined surface inclined from top to bottom and forward, and the reset part is configured so that when the locking member is located on the reset inclined surface and the waist support 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. 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 moves forward, and 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 moves backward, and realizes the reciprocating movement of the locking member and the front and back adjustment of the lumbar support.

[0022] 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 after entering the shift slot, thereby maintaining the lumbar support in the current position and achieving stable support. In this embodiment, the shift slot is tilted from top to bottom and forward.

[0023] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0024] The two track seats form a set of parallel tracks, which support the left and right ends of the lumbar support. They not only increase the support stability in terms of quantity, but more importantly, they are located at the left and right ends of the lumbar support in the connection position, which not only prevents the lumbar support from twisting due to the tilt of the human body, but also firmly stabilizes the left and right ends of the lumbar support, thereby improving its stability.

[0025] In addition to stability, the parallel rails are connected to the left and right ends of the lumbar support, that is, connected to the two force-bearing parts of the lumbar support, and two force points are formed on the two force-bearing parts respectively. The pressure given to the lumbar support by the waist is transmitted to the sliding support via the force points, and the sliding support gives the lumbar support a reaction force for supporting the waist; in this solution, the supporting area formed on the supporting part that fits the human waist is separated from the force points formed on the force-bearing part. When the human waist leans on the lumbar support, the human body will not feel the foreign body sensation caused by the force points. On the contrary, the supporting part will produce a slight deformation to provide cushioning during support, making the lumbar support feel more "soft" when supporting the waist, thereby improving the comfort of use.

[0026] The two tracks are parallel and face forward to provide a guiding effect. This guiding effect allows the lumbar support to move completely forward. Compared with the existing technology, its movement range can be greatly improved and will not be limited by factors such as the rotation angle, so it can adapt to the use of more people. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of the lumbar support located at the rear in the embodiment of the present invention. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the three-dimensional structure of the lumbar support located at the rear in the embodiment of the present invention. Figure 2 ;

[0029] Figure 3 This is a schematic diagram of the three-dimensional structure of the embodiment of the present invention with the lumbar support located at the front;

[0030] Figure 4 This is a side view of the embodiment of the utility model with the lumbar support located at the rearmost position;

[0031] Figure 5 This is a side view of the embodiment of the utility model with the lumbar support located at the front;

[0032] 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;

[0033] Figure 7 This is a schematic diagram of the three-dimensional structure of the lumbar support and the sliding support member being rotatably connected in an embodiment of the present invention;

[0034] 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;

[0035] Figure 9 for Figure 3 A partial enlarged view of part A in the middle;

[0036] Figure 10 for Figure 3 A partial enlarged view of part B in the middle;

[0037] Figure 11 This is a front view of the lumbar support in an embodiment of the present utility model;

[0038] Figure 12 This is a top view schematic diagram of two track seats forming parallel tracks in an embodiment of the present invention.

[0039] The figures are marked as follows: back support assembly 1; backrest 101; back bracket 102; lumbar support 2; supporting part 21; force-bearing part 22; sliding support member 3; track seat 4; track groove 5; reset member, torsion spring 6; gear part 7; starting part 71; reset part 72; swing rod 8; locking member 81; retaining part 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; slide rail 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 、 5 As shown, the utility model provides a chair back device, including a back support assembly 1, a lumbar support 2 and a sliding support member 3. The back support assembly 1 extends forward with a track seat 4, and the track seat 4 is provided with a track groove 5 for accommodating the sliding support member 3, and the sliding support member 3 is slidably set in the track groove 5; the lumbar support 2 is rotatably connected to the sliding support member 3, and a reset member 6 is provided between the sliding support member 3 and the lumbar support 2, and the reset member 6 is configured to always give the lumbar support 2 a reset rotation force; an adjustment support assembly is provided between the sliding support member 3 and the track seat 4, and the adjustment support assembly is configured to support the sliding support member 3 to stay at different positions of the track groove 5 to support the lumbar support 2 in the front and rear directions.

[0045] Specifically, if Figure 1-3As shown in , 11 and 12, the back support assembly 1 is provided with two track seats 4 spaced apart from each other on the left and right sides, and the two track seats 4 are provided with the track grooves 5, and the two track grooves 5 are parallel to the front; the sliding support members 3 are provided in the track grooves 5; the lumbar support 2 includes a supporting portion 21 located in the middle thereof for fitting the human waist and two force-bearing portions 22 located at the left and right ends thereof for providing supporting force, and the two sliding support members 3 are respectively connected to the two force-bearing portions 22 of the lumbar support 2; when the user's waist leans on the lumbar support 2, the supporting portion 21 fits and supports the waist, and the two force-bearing portions 22 share the load given by the waist; when the lumbar support 2 moves forward and backward, the two sliding support members 3 are synchronously translated in the two track grooves 5 respectively, and the lumbar support 2 is translated horizontally back and forth under the guidance of the track grooves 5.

[0046] The two track seats 4 form a set of parallel tracks, which support the left and right ends of the lumbar support 2. The parallel tracks not only increase the support stability in terms of quantity, but more importantly, they are located at the left and right ends of the lumbar support 2 in the connection position, which not only prevents the lumbar support from twisting due to the tilt of the human body, but also firmly stabilizes the left and right ends of the lumbar support 2, thereby improving its stability.

[0047] In addition to stability, the parallel rails are connected to the left and right ends of the lumbar support 2, that is, connected to the two force-bearing parts 22 of the lumbar support 2, and two force points are formed on the two force-bearing parts 22 respectively. The pressure given to the lumbar support 2 by the waist is transmitted to the sliding support 3 via the force points, and the sliding support 3 gives the lumbar support 2 a reaction force for supporting the waist; in this solution, the supporting area formed on the supporting part 21 that fits the human waist is separated from the force points formed on the force-bearing part 22. When the human waist leans on the lumbar support 2, the human body will not feel the foreign body sensation brought by the force points. On the contrary, the supporting part 21 will produce a slight deformation to provide cushioning during support, making the lumbar support 2 feel more "soft" when supporting the waist, thereby improving the comfort of use.

[0048] The two tracks are parallel and face forward to provide a guiding effect. This guiding effect enables the lumbar support 2 to move completely forward. Compared with the existing technology, its movement range can be greatly improved and will not be limited by factors such as the rotation angle, so it can adapt to the use of more people.

[0049] The lumbar support 2 is a frame structure with a hollow portion, and two sliding supports 3 are connected to the force-bearing portion 22 of the lumbar support 2 in the hollow portion; in the height direction, the two sliding supports 3 are connected at the middle and lower part of the lumbar support 2, or in other words, at the middle and lower part of the force-bearing portion 22; the sliding supports 3 are connected to the lumbar support 2 through the hollow portion, which can reduce the width, make the structure more compact, and further increase the supporting stability performance of the lumbar support 2; when the connection position of the sliding supports 3 is configured according to this scheme, the degree of overhang of the lower parts of the left and right ends of the lumbar support 2 can be greatly reduced, further increasing the ability of the lumbar support 2 to prevent twisting.

[0050] The two track seats 4 extend forward in parallel and horizontally and protrude from the back support assembly 1; the track groove 5 is open to the front and the rear end is closed. In the left and right directions, the track groove 5 is open toward the outside of the back support assembly 1; the track seat 4 extends horizontally forward to provide additional support for the sliding support 3, making the support of the lumbar support 2 more stable; the rear end of the track groove 5 is closed to provide a rear limit for the sliding support 3; and the track groove 5 is open outward to expose the sliding support 3, so that the position of the sliding support 3 can be intuitively felt and it is more beautiful.

[0051] More specifically, 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 support 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.

[0052] 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 is pressed 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.

[0053] In addition, the track seat 4 faces straight forward, and the displacement of the sliding support 3 is used to adjust the lumbar support 2 in the front-to-back direction. The lumbar support 2 only moves 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.

[0054] like 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 track seat 4 is arranged on the back bracket 102 and is located below the backrest 101; further, the track seat 4 and the sliding support member 3 are arranged in the front-to-back direction, and a group of adjustment support components are provided between each track seat 4 and the sliding support member 3, and the adjustment support component includes a gear portion 7 and an elastic swing rod 8, the gear portion 7 is provided on one of the track seat 4 or the sliding support member 3, and the swing rod 8 is provided on the other of the track seat 4 or the sliding support member 3; in this embodiment, as Figure 3 、 6As shown in Figure 10, the gear member is arranged on the sliding support member 3, and the swing rod 8 is arranged on the track seat 4; the head of the swing rod 8 extends toward the gear portion 7 with a locking member 81, the track seat 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 toward the rotating member. The avoidance hole 11 is located at the head position of the swing rod 8, and the locking member 81 Through the avoidance hole 11 to the gear part 7; the gear part 7 is provided with a plurality of gear slots 12 arranged at intervals along the front and rear directions. When the lumbar support 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 exerted by the back on the lumbar support 2, so as to keep the lumbar support 2 in the current position and achieve stable support; in this embodiment, the gear slot 12 is tilted from top to bottom and forward.

[0055] 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 lock When the member 81 is located on the reset inclined surface and the lumbar support 2 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 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 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.

[0056] The swing rod 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 rod 8 allows the lumbar support 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 part 7, such as both are arranged on the sliding support member 3; the reciprocating ring groove 13 surrounds the gear part 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.

[0057] 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 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 2 moves backward, and realize the reciprocating movement of the locking member 81 and the front and back adjustment of the lumbar support 2.

[0058] Furthermore, if Figure 7-9 As shown, the lumbar support 2 is rotatably connected to the front end of the sliding support 3, and the lumbar support 2 has a hollow rotating seat 14, and a boss 15 is protruded from the rotating seat 14 toward the sliding support 3, and the boss 15 is rotatably connected to the sliding support 3 through a rotating shaft; the reset member 6 is a torsion spring 6, and the central axis of the torsion spring 6 is arranged in the left and right directions, and the torsion spring 6 is sleeved on the boss 15; the torsion spring 6 has two torsion arms extending along the axial direction, and the two torsion arms are respectively inserted in the lumbar support 2 and the sliding support 3; when the lumbar support 2 rotates backward, the torsion spring 6 is deformed and at the same time provides a buffer for the rotation of the lumbar support 2. When the human waist leaves the lumbar support 2, the elastic force of the torsion spring 6 resets the lumbar support 2.

[0059] A rotation groove 16 is provided on the rotating seat 14, and a limit block 17 is protruded toward the rotation groove 16 on the sliding support 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 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 2. In this solution, the maximum rotation angle of the lumbar support 2 is 15°.

[0060] The track groove 5 is formed by the outer surface of the track seat 4 being concave from the outside to the inside, and the parts of the track seat 4 located on the upper and lower sides of the track groove 5 and protruding outward are the tracks of the sliding support 3; a number of ridges 18 are arranged at intervals along the up and down directions in the track groove 5, and the ridges 18 extend along the front and back directions; two slide rails 19 are also protruded in the track groove 5, and the two limit bars protrude upward and downward respectively, and a guide groove 20 is provided on the sliding support 3, and the slide rail 19 is inserted into the guide groove 20; the ridge 18 contacts the sliding support 3 to reduce the contact area, so that the sliding support 3 slides more smoothly and the lumbar support 2 is adjusted more easily, and the lumbar support 2 can be adjusted by gently pulling the lumbar support 2 forward; the guide groove 20 and the slide rail 19 cooperate to guide the sliding of the sliding support 3, and the slide rail 19 and the guide groove 20 both extend along the front and back directions.

[0061] The sliding support member 3 and the track seat 4 are both long strips, and the lengths of the sliding support member 3 and the track seat 4 are similar, and the lengths of the two determine 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 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 2 is 45mm.

Claims

1. A chair back device, characterized in that: The lumbar support comprises a lumbar support and a back support assembly, wherein the back support assembly is provided with two track seats spaced apart on the left and right, and both track seats are provided with track grooves, which face forward in parallel; sliding supports are provided in both track grooves, which are slidably arranged in the track grooves; the lumbar support comprises a supporting portion located in the middle thereof for fitting the waist of the human body and two force-bearing portions located at its left and right ends for providing supporting force, and the two sliding supports are respectively connected to the two force-bearing portions of the lumbar support; an adjustment support assembly is provided between the sliding support and the track seat, and the adjustment support assembly is configured to support the sliding support to stay in different positions of the track groove; when the user's waist leans on the lumbar support, the supporting portion fits and supports the waist, and the two force-bearing portions share the load given by the waist; when the lumbar support moves forward and backward, the two sliding supports are synchronously translated in the two track grooves, and the lumbar support is translated horizontally forward and backward under the guidance of the track grooves.

2. The seat back device according to claim 1, wherein: The lumbar support is a frame structure with a hollow portion formed therein, and two sliding support members are connected to the force-bearing portion of the lumbar support in the hollow portion.

3. The seat back device according to claim 1, wherein: In the height direction, the two sliding support members are connected at the lower middle part of the lumbar support.

4. The seat back device according to claim 1, wherein: The two track seats extend forward in parallel and horizontally and protrude from the back support component.

5. The seat back device according to claim 1, wherein: The track groove is open toward the front and has a closed rear end. In the left-right direction, the track groove is open toward the outside of the back support assembly.

6. The seat back device according to claim 5, wherein: Two horizontal and parallel slide rails are arranged in the two track grooves, and the slide rails protrude from the track grooves in the vertical direction; a guide groove is opened on the sliding support member, and the slide rails are inserted into the guide groove.

7. The seat back device according to claim 1, wherein: The adjustment support assembly includes a gear part and an elastic swing rod. The gear part is arranged on one of the track seat or the sliding support member, and the swing rod is arranged on the other of the track seat or the sliding support member; a locking member is extended from the head of the swing rod toward the gear part, and a plurality of gear slots are arranged at intervals along the front and rear directions on the gear part. When the lumbar support moves forward and backward, the swing rod is deformed and the locking member switches between different gear slots.

8. The seat back device according to claim 7, wherein: 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.

9. The seat back device according to claim 8, wherein: The swinging member is arranged on the track seat, and the gear part is arranged on the sliding support member. The track seat 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 waist support moves backward, the locking member passes over the gear groove from below the gear part in the reciprocating ring groove and comes to the starting part.

10. The seat back device according to claim 7, wherein: The gear slot is tilted in the up and down directions.

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