Chair back device capable of improving waist supporting stability

Abstract

The invention provides a chair back device capable of improving waist supporting stability, the chair back device comprises a back supporting assembly and a waist rest, the back supporting assembly is provided with two track seats which are spaced left and right, a track groove of each track seat is 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 invention relates to the field of furniture, and in particular to a chair back device for improving waist supporting stability. Background Art

[0002] In order to adapt to different usage conditions of different groups of people or users, the lumbar support of the chair has the function of being adjusted along the seat depth direction; firstly, the seat depth can be adjusted to adapt to 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 effect after the lumbar support moves forward gives 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 one of the key factors.

[0003] Specifically, the larger the stroke, the wider the range of people it can adapt to, and the wider the range of people who benefit from it, the wider the market for the product and the more revenue it can generate. In addition, the lumbar support has a better effect and can accommodate more people who need it. However, the existing several types of lumbar support that can be adjusted forward and backward are difficult to achieve a good enough effect, and the lumbar support has poor stability. Within the range that can originally support the waist, the original lumbar support effect will be lost due to poor stability, making the comfort worse. The characteristics of each type of lumbar support are as follows: 1. The linear knob type lumbar support is mainly adjusted by a threaded rod threadedly connected to the backrest or back support, and the knob is turned to move the threaded rod forward and backward, 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, just 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 decreases; and 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 get up to adjust, which is very inconvenient and troublesome to operate, such as Chinese patent CN202222529161.2.

[0004] 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.

[0005] 3. The adjustable lumbar support with complex mechanism mainly realizes the front and rear adjustment of the lumbar support by setting up more complex adjustment support mechanisms such as connecting rod mechanisms. Generally speaking, the complex mechanism is also set in the middle part of the lumbar support, which makes the middle part 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 increase the cost, such as Chinese patent CN202211454797.3.

[0006] Therefore, how to increase the size of the stroke 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

[0007] In order to solve the above-mentioned technical problems, the present invention provides a chair back device for improving the stability of lumbar support, including a back support assembly and a lumbar support, the back support assembly is provided with two track seats spaced apart from each other, 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-rear direction in the track groove; the lumbar support includes a supporting portion located in the middle part thereof for fitting the human waist and two force-bearing portions located at the left and right ends thereof respectively for providing supporting force, the two sliding supports are connected in parallel to the two force-bearing portions, and an adjustment support assembly for adjusting and supporting the sliding support member to stay at different positions in 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 portion fits and supports the waist, and the two force-bearing portions share the load given by the waist, thereby increasing the support stability and comfort of the lumbar support.

[0008] The technical solution of the present invention is achieved in this way: A chair back device for improving the stability of lumbar support, comprising a lumbar support and a back support assembly, wherein the back support assembly is provided with two track seats spaced left and right, and the two track seats are provided with track grooves, which are parallel and face forward; sliding supports are provided in the track grooves, and the sliding supports are slidably arranged in the track grooves; the lumbar support comprises a supporting part located in the middle part thereof for fitting the waist of the human body and two force-bearing parts located at the left and right ends thereof respectively for providing supporting force, and the two sliding supports are respectively connected to the two force-bearing parts of the lumbar support; an adjusting support assembly is provided between the sliding support and the track seat, and the adjusting support assembly is configured to support the sliding support to stay at 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 respectively translated synchronously in the two track grooves, and the lumbar support is translated horizontally forward and backward under the guidance of the track grooves.

[0009] The two track seats form a set of parallel tracks, which support the left and right ends of the lumbar support. The parallel tracks not only increase the support stability in terms of quantity, but more importantly, are located at the left and right ends of the lumbar support in terms of connection position, which not only prevents the lumbar support from being twisted due to the tilt of the human body, but also firmly stabilizes the left and right ends of the lumbar support to improve its stability.

[0010] In addition to stability, the parallel tracks 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 brought 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 softer when supporting the waist, thereby improving the comfort of use.

[0011] The two tracks are parallel and face forward to provide a guiding effect. This guiding effect enables 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 be used by more people.

[0012] Preferably, the waist support is a frame structure with a hollow, and two sliding supports are connected to the force-bearing part of the waist support in the hollow. The sliding supports are connected to the waist support from the hollow, which can reduce the width, make the structure more compact, and further increase the support stability of the waist support.

[0013] Preferably, in the height direction, the two sliding supports are connected at the middle and lower part of the lumbar support. When the connection position of the sliding supports is configured according to this scheme, the degree of the lower part of the left and right ends of the lumbar support can be greatly reduced, further increasing the ability of the lumbar support to prevent twisting.

[0014] 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.

[0015] Preferably, the track groove is open to the front and closed at the rear end, and in the left-right direction, the track groove is open to the outside of the back support assembly. The closed rear end of the track groove can provide a rearward limit for the sliding support member; while the track groove is open to the outside to expose the sliding support member, so that the position of the sliding support member can be intuitively felt and it is more beautiful.

[0016] Preferably, 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 provided on the sliding support, and the slide rails are inserted in the guide groove. The guide groove and the slide rail cooperate to guide the sliding of the sliding support, and the slide rails and the guide groove both extend in the front-rear direction.

[0017] Preferably, 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, and the swing rod is arranged on the other of the track seat or the sliding support; a locking piece is extended from the head of the swing rod toward the gear part, and a plurality of gear slots arranged at intervals along the front-to-back direction are provided on the gear part, and when the lumbar support moves forward and backward, the swing rod is deformed and the locking piece switches between different gear slots. The elasticity of the swing rod enables the locking piece to switch between different gear slots, and the cooperation of the plurality of gear slots and the swing rod enables the lumbar support to stay at different positions, thereby meeting the lumbar support requirements of people of different body shapes and different body postures.

[0018] Preferably, a reciprocating annular groove is further provided on the outer side of the shift portion, the reciprocating annular groove is connected with the shift groove, and the reciprocating annular groove is configured so that the locking member enters different shift grooves after passing through the reciprocating annular groove. The reciprocating annular groove is provided on the same component as the shift portion, such as both are provided on the sliding support member; the reciprocating annular groove surrounds the shift portion and is connected with the shift groove, the locking member can slide in the reciprocating annular groove, and the locking member is always in the reciprocating annular groove or the shift groove, thereby determining the movement path of the locking member.

[0019] Preferably, 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 retaining part, which 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, and 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 rest 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, so that the locking member can 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 the locking member can directly and unimpededly slide 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.

[0020] Preferably, the gear slot is tilted in the up-down direction to ensure that the locking member will not leave the gear slot due to the force exerted by the back on the lumbar support to push it backward after entering the gear slot, so as to keep the lumbar support in the current position and achieve stable support; in this embodiment, the gear slot is tilted forward from top to bottom.

[0021] The design starting point, concept and beneficial effects of the present invention using the above technical solution are: The two track seats form a set of parallel tracks, which support the left and right ends of the lumbar support. The parallel tracks not only increase the support stability in terms of quantity, but more importantly, are located at the left and right ends of the lumbar support in terms of connection position, which not only prevents the lumbar support from being twisted due to the tilt of the human body, but also firmly stabilizes the left and right ends of the lumbar support to improve its stability.

[0022] In addition to stability, the parallel tracks 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 brought 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 softer when supporting the waist, thereby improving the comfort of use.

[0023] The two tracks are parallel and face forward to provide a guiding effect. This guiding effect enables 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 be used by more people. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The three-dimensional structure of the waist support in the embodiment of the present invention is shown as follows Figure 1 ; Figure 2 The three-dimensional structure of the waist support in the embodiment of the present invention is shown as follows Figure 2 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the lumbar support in the embodiment of the present invention, in which the lumbar support is located at the front; Figure 4 A side view of the lumbar support in the embodiment of the present invention, wherein the lumbar support is located at the rearmost position; Figure 5 A side view of the embodiment of the present invention with the lumbar support located at the front; Figure 6 It is a schematic diagram of the three-dimensional structure of the locking member in the reciprocating annular groove in an embodiment of the present invention; Figure 7 It is a schematic diagram of a three-dimensional structure in which a lumbar support is rotatably connected to a sliding support member in an embodiment of the present invention; Figure 8 It is a schematic diagram of a three-dimensional structure in which a torsion spring is arranged on a protruding column in an embodiment of the present invention; Fig. 9 for Figure 3 A partial enlarged view of the middle A part; Fig.10 for Figure 3 A partial enlarged view of part B in the middle; Fig.11 It is a front view of the lumbar support in an embodiment of the present invention; Fig.12 It is a top view schematic diagram of two track seats constituting parallel tracks in an embodiment of the present invention.

[0025] 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

[0026] In order to more clearly understand the above-mentioned purpose, 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 in the embodiments can be combined with each other without conflict.

[0027] 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 protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0028] 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.

[0029] The specific implementation of the present invention is as follows: like Figure 1 , 5As shown, the present invention provides a chair back device for improving the stability of lumbar support, including a back support component 1, a lumbar support 2 and a sliding support member 3. The back support component 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 component is provided between the sliding support member 3 and the track seat 4, and the adjustment support component 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.

[0030] Specifically, if Figure 1-3 As shown in Figures 11 and 12, the back support assembly 1 is provided with two track seats 4 spaced apart from each other, and the two track seats 4 are provided with the track grooves 5, which 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 waist of the human body 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 respectively translated synchronously in the two track grooves 5, and the lumbar support 2 is translated horizontally forward and backward under the guidance of the track grooves 5.

[0031] 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, are located at the left and right ends of the lumbar support 2 in terms of 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.

[0032] 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 softer when supporting the waist, thereby improving the comfort of use.

[0033] The two tracks are parallel to the front to provide a guiding effect, which enables the lumbar support 2 to move completely forward. Compared with the prior art, its movement range can be greatly improved and will not be limited by factors such as the rotation angle, so that it can adapt to the use of more people.

[0034] The lumbar support 2 is a frame structure and is hollowed out, and two sliding supports 3 are connected to the force-bearing part 22 of the lumbar support 2 in the hollow; in the height direction, the two sliding supports 3 are connected to the middle and lower part of the lumbar support 2, or to the middle and lower part of the force-bearing part 22; the sliding supports 3 are connected to the lumbar support 2 through the hollow, 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 suspension of the lower part 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.

[0035] The two track seats 4 extend forward in parallel and horizontally and protrude from the back support component assembly 1; the track groove 5 is open to the front and the rear end is closed, and in the left and right directions, the track groove 5 is open to the outside of the back support component 1; the track seat 4 extends forward horizontally 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 rearward 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.

[0036] 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.

[0037] In the present solution, the adjusting support assembly is used to adjust the front and rear position of the lumbar support 2 and to support the lumbar support 2 after it is moved; the function of the reset member 6 is, on the one hand, to provide a buffer for the adaptive rotation of the lumbar support 2 and to 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 groups of 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 improving market competitiveness.

[0038] 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 and directly moves 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 the solution can achieve a larger travel.

[0039] like Figure 1-3As 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 assemblies are arranged between each track seat 4 and the sliding support member 3, and the adjustment support assembly includes a gear portion 7 and an elastic swing rod 8, the gear portion 7 is arranged on one of the track seat 4 or the sliding support member 3, and the swing rod 8 is arranged on the other of the track seat 4 or the sliding support member 3; in this embodiment, as Figure 3 , 6 As shown in Figures 10, the shift 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 shift 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 also provided with an avoidance hole 11 that passes through the rotating member, the avoidance hole 11 is located at the head of the swing rod 8, and the locking member 81 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 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-down direction 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 given to the lumbar support 2 by the back, 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 forward from top to bottom.

[0040] The outer side of the gear portion 7 is also provided with a reciprocating ring groove 13, which is connected to the gear groove 12, and the reciprocating ring groove 13 is configured so that the locking member 81 enters into different gear grooves 12 after passing through the reciprocating ring groove 13; the retaining portion 9 clamps the swing member and is retained 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, and 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 locking 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 also inclines 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.

[0041] The swing rod 8 is elastic so that the locking piece 81 can switch between different gear slots 12. The cooperation between several gear slots 12 and the swing rod 8 enables the lumbar support 2 to stay at 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 support member 3; the reciprocating ring groove 13 surrounds the gear portion 7 and is connected to the gear slot 12, the locking piece 81 can slide in the reciprocating ring groove 13, and the locking piece 81 is always in the reciprocating ring groove 13 or the gear slot 12, thereby determining the movement path of the locking piece 81.

[0042] 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, so as to facilitate the movement of the locking member 81 in the reciprocating annular groove 13 and the gear groove 12, and also stipulates the movement trajectory of the locking member 81 in disguised form; the reciprocating annular groove 13 is annular, so that the locking member 81 can switch between different gear grooves 12 when moving backward in the reciprocating annular groove 13 of the upper part, that is, the lumbar support 2 moves forward, and the locking member 81 can directly and unimpededly slide to the starting part 71 when moving forward in the reciprocating annular groove 13 of the lower part, that is, the lumbar support 2 moves backward, and realizes the reciprocating movement of the locking member 81 and the front and rear adjustment of the lumbar support 2.

[0043] 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. 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 direction, 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.

[0044] A rotating groove 16 is provided on the rotating seat 14, and a limit block 17 is protruded toward the rotating groove 16 on the sliding support member 3. The limit block 17 is located in the rotating groove 16 and the length of the limit block 17 is less than the length of the rotating groove 16; the rotating groove 16 and the limit block 17 both have an arc, and when the lumbar support 2 rotates, the limit block 17 rotates in the rotating groove 16, and the angle of the gap between the limit block 17 and the rotating 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°.

[0045] 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 plurality of convex strips 18 arranged at intervals along the up and down directions are provided in the track groove 5, and the convex strips 18 extend along the front and back directions; two slide rails 19 are also protruded in the track groove 5, and the two limit strips protrude upward and downward respectively, and a guide groove 20 is opened on the sliding support 3, and the slide rail 19 is inserted in the guide groove 20; the convex strip 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.

[0046] The sliding support member 3 and the track seat 4 are both in the shape of 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 for improving lumbar support stability, characterized in that: The invention comprises a lumbar support and a back supporting assembly, wherein the back supporting assembly is provided with two track seats spaced apart from each other on the left and right sides, and the two track seats are provided with track grooves, which are parallel to the front; sliding supports are provided in the track grooves, and the sliding supports are slidably arranged in the track grooves; the lumbar support comprises a supporting part located in the middle part thereof for fitting the waist of the human body and two force-bearing parts located at the left and right ends thereof respectively for providing supporting force, and the two sliding supports are respectively connected with the two force-bearing parts of the lumbar support; an adjusting support assembly is provided between the sliding support and the track seat, and the adjusting support assembly is configured to support the sliding support to stay at 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 respectively translated synchronously in the two track grooves, and the lumbar support is translated horizontally forward and backward under the guidance of the track grooves.

2. The chair back device for improving lumbar support stability according to claim 1, characterized in that: The lumbar support is a frame structure with a hollow portion, and two sliding support members are connected to the force-bearing portion of the lumbar support in the hollow portion.

3. The chair back device for improving lumbar support stability according to claim 1, characterized in that: In the height direction, two sliding supports are connected at the middle and lower parts of the lumbar support.

4. The chair back device for improving lumbar support stability according to claim 1, characterized in that: The two track seats extend forward in parallel and horizontally and protrude from the back support component.

5. The chair back device for improving lumbar support stability according to claim 1, characterized in that: 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 chair back device for improving lumbar support stability according to claim 5, characterized in that: 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 in the guide groove.

7. The chair back device for improving lumbar support stability according to claim 1, characterized in that: 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 arranged at intervals along the front and rear directions are opened 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 chair back device for improving lumbar support stability according to claim 7, characterized in that: A reciprocating ring groove is also provided on the outer side of the gear portion, the reciprocating ring groove is connected with the gear groove, and 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 chair back device for improving lumbar support stability according to claim 8, characterized in that: 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 retaining part, which 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, 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 annular groove and comes to the starting part.

10. The chair back device for improving lumbar support stability according to claim 7, characterized in that: The gear slot is arranged to be inclined in the up-down direction.

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