Sports chair back with waist supporting function

Abstract

The utility model provides a sports chair back of waist support, including seat part and back component, back component includes upper back piece and lower back piece, upper back piece and lower back piece are respectively with seat part relative rotation arrangement, the chair back has sitting posture state and lying posture state, in the sitting posture state, the back of waist and upper back piece vertical and forward support human body waist back, in the lying posture state, the back of waist and lower back piece vertical and forward support human body back. The lower back piece and the upper back piece are inclined to support the inclined waist and back of a human body; in the sitting posture state and the lying posture state, the rear end of the seat part always backwards exceeds the front end of the lower back piece; therefore, the lower back piece and the seat part are prevented from being far away from each other, no gap exists between the lower back piece and the seat part, and the phenomenon of empty waist between the lower back piece and the seat part is avoided, so that the waist of a human body is more completely supported by the lower back piece, and the comfort of the chair back in a lying posture state is improved.

Description

Technical Field

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

[0002] Existing seats have become increasingly versatile and can provide both sitting and lying functions. The sitting and lying functions can be switched simply by tilting the chair back. Having complete functions does not mean that the seat is excellent. The biggest criterion for judging a seat is still comfort, and it should provide ergonomic comfort.

[0003] In the existing chairs, when the chair back tilts backward, the lumbar support moves with the chair back, so the lumbar support and the seat move away from each other, thereby generating a gap between the lumbar support and the seat, and the human waist in the gap cannot be supported by the lumbar support. In the long run, the user feels poor comfort and is accompanied by hidden dangers to the health of the waist. Moreover, whether it is a single or double chair back, as long as the lumbar support and the chair back move and produce relative displacement with the seat, this problem cannot be avoided; as shown in utility model patent 202320935281.4, the lower end of the chair back is not fully utilized. When the chair back tilts backward, the lower end of the chair back, which is the most supporting waist, will produce relative displacement with the seat, thereby generating a gap and forming an empty waist. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the utility model provides a sports chair back supporting the waist, including a seat and a back assembly, the back assembly including an upper back piece and a lower back piece, the upper back piece and the lower back piece are respectively arranged to rotate relative to the seat, and the chair back has a sitting state and a lying state. In the sitting state, the lumbar support and the upper back piece are vertical and support the waist and back of the human body forward, and in the lying state, the lower back piece and the upper back piece are inclined to support the inclined waist and back of the human body; in the sitting state and the lying state, the rear end of the seat always exceeds the front end of the lower back piece backwards; thereby preventing the lower back piece and the seat from moving away from each other, there is no gap between the lower back piece and the seat, and there will be no empty waist between the lower back piece and the seat, so that the human waist is more completely supported by the lower back piece, thereby improving the comfort of the chair back in the lying state.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A sports chair back with lumbar support, comprising:

[0007] a seat portion configured to support a buttocks of a human body;

[0008] The back assembly includes an upper back piece and a lower back piece; the upper back piece and the lower back piece are respectively rotatably arranged relative to the seat;

[0009] An upper back member configured to support a back of a human body, the upper back member being located above the lower back member;

[0010] A lower back member, configured to support the waist of a human body, the lower back member being disposed between the seat portion and the upper back member;

[0011] The utility model has a sitting state and a lying state. In the sitting state, the lower back part and the upper back part are vertical and support the waist and back of the human body forward. In the lying state, the lower back part and the upper back part are inclined to support the inclined waist and back of the human body. In the sitting state and the lying state, the rear end of the seat always exceeds the front end of the lower back part backward.

[0012] In the present solution, the lower back member is always located above the seat, and the rear end of the seat always extends backwards beyond the front end of the lower back member, and the front end of the lower back member never leaves the area above the chair back. There will be no gap between the lower back member and the chair back due to switching between the sitting state and the lying state. This prevents the lower back member and the seat from moving away from each other, and there is no gap between the lower back member and the seat, so there will be no empty waist phenomenon, so that the human waist is more completely supported by the lower back member, thereby improving the comfort of the chair back in the lying state.

[0013] Preferably, the connection point between the lower back member and the seat is located in the middle of the lower back member. The lower end of the lower back member is vacant, and the lower end of the lower back member can extend forward under the waist of the human body to provide support in a lying state, so as to provide a more comfortable waist support.

[0014] Preferably, a vertical rotating frame is fixedly connected to the rear end of the seat, the rotating frame protrudes upward from the upper surface of the seat, and the lower back piece is rotatably connected to the rotating frame. The lower back piece is connected to the rotating frame instead of being directly connected to the seat. On the one hand, the height of the lower back piece is raised, so that the lower back piece has a height similar to that of the existing seat in the sitting state, achieving the desired function. At the same time, the lower back piece will not interfere with the seat when rotating, and can effectively avoid the seat. On the other hand, the lower back piece is rotatably connected to the rotating frame, which is obviously different from the rotation connection point of the upper back piece. In this case, the lower back piece can be rotated at a larger angle, so that the angle between the lower back piece and the upper back piece is reduced, achieving the desired effect.

[0015] Preferably, the rotating frame is rotatably connected to the lower back member at the middle of the lower back member, and when the sitting position is switched to the lying position, the lower end of the lower back member moves from top to bottom and from back to front and extends under the waist of the human body. The front end of the lower back member can extend forward under the waist of the human body to provide support, giving the human waist a more complete and comfortable support.

[0016] Preferably, a back bracket is connected below the upper back piece, the back bracket is rotatably arranged relative to the seat, the lower end of the upper back piece is relatively fixedly connected to the upper end of the back bracket, and the upper end of the lower back piece is rotatably connected to the back bracket.

[0017] Preferably, the back support is L-shaped.

[0018] Preferably, the upper back member and the lower back member rotate independently, and when the person changes from a sitting position to a lying position, the back of the person presses against the upper back member, the upper back member tilts backward, and the waist of the person pushes the lower back member to rotate. Thus, the upper back member and the lower back member can adapt to the posture of the back and the lower back member to provide appropriate support.

[0019] Preferably, the lower back member is rotatably connected to the upper back member, and when the sitting position is switched to the lying position, the back of the human body pushes the upper back member to rotate relative to the seat, and the upper back member drives the lower back member to rotate relative to the seat. The movement of the chair back is linked by the upper back member driving the lower back member, without adding other operating steps, making the adjustment of the chair back more convenient and quick.

[0020] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0021] In the present solution, the lower back member is always located above the seat, and the rear end of the seat always extends backwards beyond the front end of the lower back member, and the front end of the lower back member never leaves the area above the chair back. There will be no gap between the lower back member and the chair back due to switching between the sitting state and the lying state. This prevents the lower back member and the seat from moving away from each other, and there is no gap between the lower back member and the seat, so there will be no empty waist phenomenon, so that the human waist is more completely supported by the lower back member, thereby improving the comfort of the chair back in the lying state. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the seat when the sports chair back is in a sitting position in the embodiment of the utility model;

[0023] Figure 2 It is a side view of the seat when the sports chair back is in a sitting position in the embodiment of the utility model;

[0024] Figure 3 It is a cross-sectional view of the seat when the motion chair back is in a sitting position in the embodiment of the utility model;

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the lower back member and the moving member when the moving chair back is in a sitting position in the embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the seat with the sports chair back in a lying position in an embodiment of the utility model;

[0027] Figure 6 It is a side view of the seat with the sports chair back in a lying position in the embodiment of the utility model;

[0028] Figure 7 It is a cross-sectional view of the seat of the utility model in the embodiment of the sports chair back in a lying state;

[0029] Figure 8 It is a three-dimensional structural schematic diagram of the lower back member and the moving member when the moving chair back is in a lying position in an embodiment of the utility model;

[0030] Fig. 9 This is a schematic diagram of the three-dimensional structure of the seesaw connected to the chassis and the guide part in the embodiment of the utility model;

[0031] Fig.10 It is a schematic diagram of the three-dimensional structure of the fitting surface formed when the sports chair back is in a lying state in the embodiment of the utility model;

[0032] Fig.11 This is a schematic diagram of the use of the seat in the embodiment of the utility model, in which the sports chair back is in a sitting position;

[0033] Fig.12 This is a schematic diagram of the use of the seat in the embodiment of the utility model, with the sports chair back in a lying position.

[0034] The reference numerals of the figures are as follows: seat 1; upper back member 2; lower back member 3; chassis 4; moving member 5; back bracket 6; extension seat 7; sliding rotating member 8; limiting column 9; slide groove 10; limiting groove 11; rocker 12; guide portion 13; guide member 14; guide groove 15; rotating frame 16; fixing portion 161; support arm 162; reference line 17. DETAILED DESCRIPTION

[0035] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. 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.

[0036] 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.

[0037] 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.

[0038] The specific implementation of the utility model is as follows:

[0039] When a user sits on a chair normally, the curve of his / her waist and back is S-shaped. In order to adapt to and fit the S-shaped curve, the backrests in existing chairs will specially increase the convexity of the waist position. When a user lies on the chair, the curve of his / her waist and back is roughly straight. At this time, the convexity of the waist position of the backrest will not only compress the waist and back of the human body, making the user lie in an uncomfortable posture, but also, in existing conventional chairs, after the lower back part 3 rotates with the backrest, the lower back part 3 will be separated from the seat 1, and the gap between the two cannot be used to support the human waist. Therefore, the supporting effect on the human waist is poor, and the comfort is greatly reduced.

[0040] Since the buttocks are connected to the waist, when the human body lies down, there is an angle between the buttocks and the waist. If the chair back is completely located behind the seat 1 like a conventional chair, a gap will be created between the seat 1 and the chair back, and the waist above the buttocks will be higher than the chair back and the seat 1. The gap between the seat 1, the chair back and the waist makes the waist unsupported, resulting in poor comfort. If the waist is to be supported, the lower back member 3 must be able to fill this gap; but if the existing technology is used, even if the gap between the lower back member 3 and the seat 1 is removed, it is impossible to give a suitable angle to support the waist. The reason is that, regardless of the single-back structure or the double-back structure, when the chair back is reclined, the lower back member 3 always moves with the upper back member 2. While rotating, the lower back member 3 also has a downward and backward displacement movement, which reduces its height and naturally cannot support the human waist. Therefore, the chair back of the existing chair always has the problem of an empty waist.

[0041] like Figure 1 , 5 As shown in Figures 11 and 12, the utility model provides a sports chair back for supporting the waist, which is applied in a kind of sitting furniture, which comprises a seat 1, an upper back member 2, a lower back member 3 and a chassis 4, the seat 1 is configured to support the buttocks of a human body, the upper back member 2 is configured to support the back of a human body, the upper back member 2 and the seat 1 are relatively rotatably arranged, the lower back member 3 is configured to support the waist of a human body, the lower back member 3 is rotatably connected to the seat 1, and the lower back member 3 is also rotatably connected to the upper back member 2; the seat 1 is arranged on the chassis 4, the upper back member 2 is rotatably connected to the chassis 4 to achieve a relative rotation arrangement with the seat 1, when the upper back member 2 and the chassis 4 rotate, the upper back member 2 rotates relative to the seat 1, and the lower back member 3 also rotates relative to the upper back member 2 and the seat 1.

[0042] The sports chair back comprises a back assembly and the above-mentioned seat 1, the back assembly comprises an upper back piece 2 and a lower back piece 3, and the sports chair back has a sitting state and a lying state. In the sitting state, the upper back piece 2 and the lower back piece 3 are vertical and both face forward, so that the human body can sit normally; in the lying state, the upper back piece 2 leans back and the lower back piece 3 is inclined and faces upward, so that the human body can lie down; when switching from the sitting state to the lying state, the upper back piece 2 rotates backward relative to the seat 1, and the lower back piece 3 moves as the upper back piece 2 leans back, and the angle between the lower back piece 3 and the upper back piece 2 decreases, and the front end of the lower back piece 3 is always located above the seat 1.

[0043] As more and more seats have similar functions, the design focus and mainstream have gradually shifted from manual adjustment to linkage. Compared with adjustments that require manual operation, linkage is more convenient, tends to be automated, and appears to be more intelligent. For different functions, it is also important to reasonably allocate and use manual adjustment and linkage. For example, the position adjustment of parts such as armrests can be done manually, while the chair back tilt switching discussed in the present invention can replace the additional operating actions in manual adjustment because the user will drive the chair back to move when lying down. Therefore, the use of linkage is more reasonable and simpler.

[0044] Furthermore, the upper back member 2 is rotatably arranged relative to the seat 1, and the upper back member 2 has a basic reclining function. The lower back member 3 is rotatably connected to the seat 1 and the upper back member 2. When a human body leans on it, the upper back member 2 can drive the lower back member 3 to rotate relative to the seat 1, thereby realizing switching between a sitting state and a lying state. Since the lower back member 3 is directly or indirectly rotatably connected to the seat 1, the lower back member 3 and the seat 1 will not produce relative displacement movement in the front and rear directions. The front end of the lower back member 3 is always located above the seat 1, and there will be no gap between the seat 1 and the lower back member 3. It can fully and continuously support the waist and back of the human body, so that the waist can be reasonably and effectively supported without a feeling of empty waist.

[0045] In the sitting state, the upper back part 2 and the lower back part 3 can support the human body's waist and back, and fit the roughly S-shaped human waist and back curve. In the lying state, the angle between the lower back part 3 and the upper back part 2 is reduced, and the curved surface formed by the two changes, and can fit the roughly straight waist and back curve when the human body leans back. Therefore, when the human body sits or lies normally, the curved surfaces formed by the lower back part 3 and the upper back part 2 conform to the ergonomics in their respective states, so as to provide a better comfortable sitting and lying feeling.

[0046] In order to realize the linkage between the upper back piece 2 and the lower back piece 3, it is also necessary to set a moving part 5 between the upper back piece 2 and the lower back piece 3 and / or let the seat part 1 be movably set on the chassis 4; the lower back piece 3 is rotatably connected with the upper back piece 2 and the seat part 1, the upper back piece 2 is rotatably connected with the chassis 4, and the seat part 1 is set on the chassis 4. If the upper back piece 2 and the chassis 4 are relatively fixed, and the lower back piece 3 is only rotatably connected with the upper back piece 2 and the seat part 1, then when the upper back piece 2 leans back to drive the lower back piece 3 to rotate, the movement will be restricted. In order to make the movement run smoothly, additional structural settings are required; in this embodiment, a moving part 5 is provided between the upper back piece 2 and the lower back piece 3, and the seat part 1 is set on the chassis 4 through a lifting linkage mechanism.

[0047] Specifically, a moving part 5 is provided between the upper back part 2 and the lower back part 3, and the upper back part 2 and the lower back part 3 are relatively movablely arranged through the moving part 5; when the upper back part 2 rotates backward relative to the seat 1, the lower back part 3 and the upper back part 2 rotate relatively and the lower back part 3 and the upper back part 2 move away from each other; a moving part 5 is provided between the upper back part 2 and the lower back part 3 to enable the two to move relative to each other, so that the movement between the lower back part 3, the upper back part 2 and the seat 1 can be smooth; in addition to providing the moving part 5 between the upper back part 2 and the lower back part 3, the moving part 5 can also be provided between the lower back part 3 and the seat 1, and the same function and effect can also be achieved by rotatably connecting the upper back part 2 and the chassis 4, and the chassis 4 and the seat 1 move relative to each other.

[0048] There are many options for the moving part 5. The moving part 5 can be a connecting rod assembly, an elastomer, or a telescopic sleeve assembly. When the moving part 5 is a connecting rod assembly, the connecting rod in the connecting rod assembly can realize the relative rotation and relative movement of the lower back part 3 and the upper back part 2; when the moving part 5 is an elastomer, the upper end of the lower back part 3 is hinged to the elastomer, and the elastomer is deformed when the lower back part 3 and the upper back part 2 move relative to each other; when the moving part 5 is a telescopic sleeve assembly, one end of the sleeve assembly is relatively fixedly connected to the upper back part 2, and the other end of the telescopic sleeve is rotatably connected to the upper end of the lower back part 3; all three can make the linkage between the upper back part 2 and the lower back part 3 smooth and fluent.

[0049] like Figure 4 , 8As shown, in the present embodiment, a back bracket 6 is connected to the lower part of the upper back member 2, and the back bracket 6 is arranged to rotate relative to the chassis 4. The lower end of the upper back member 2 is relatively fixedly connected to the upper end of the back bracket 6, and the upper back member 2 and the back bracket 6 are integrally formed; the moving member 5 includes an extension seat 7 and a sliding rotating member 8; the extension seat 7 is fixedly installed on the back bracket 6 below the upper back member 2 toward the front, and one end of the sliding rotating member 8 is rotatably connected to the upper end of the lower back member 3, and the sliding rotating member 8 slides with the extension seat 7; when the upper back member 2 rotates backward relative to the seat 1, the lower back member 3 and the sliding rotating member 8 rotate and rotate relative to the upper back member 2. At the same time, the sliding rotating seat and the extension seat 7 slide relative to each other, and the moving member 5 extends; a limiting column 9 is provided at the end of the sliding rotating member 8 facing the extension seat 7, and a limiting column 9 is provided on both sides of the sliding rotating member 8. The extension seat 7 is provided with a slide groove 10 along the length direction, and the sliding rotating member 8 is arranged in the slide groove 10. The slide groove 10 A limiting groove 11 is provided on the side extension seat 7, and a limiting column 9 is arranged in the limiting groove 11. The trajectory of the limiting groove 11 is arranged along the extension direction of the extension seat 7. In the sitting state, the extension seat 7 bends downward from front to back; when using the moving part 5, the moving part 5 does not need to be operated. It realizes adaptive changes with the movement of the upper back part 2 and the lower back part 3 to make the movement smooth and smooth; the moving part 5 is arranged to adapt to the movement of the lower back part 3, the upper back part 2 and the seat 1. The sliding rotating part 8 in the moving part 5 and the extension seat 7 move adaptively with the movement of the three. The limiting column 9 moves in the slide groove 10 to limit the movement trajectory of the sliding rotating part 8. At the same time, the moving part 5 and the lower back part 3 limit the movement trajectories of both parties to achieve a preset movement mode; finally, the shape of the extension seat 7, that is, the shape of the limiting groove 11, both adapts to the movement of the lower back part 3 and limits the movement trajectory of the sliding rotating part 8.

[0050] like Figure 3 , 7As shown in Figures 9, the seat 1 is arranged on the chassis 4 through a lifting linkage mechanism. The lifting linkage mechanism drives the seat 1 to rise as the upper back member 2 leans back. When the upper back member 2 leans back, the upper end of the lower back member 3 moves backward and downward, and the lower end of the lower back member 3 moves upward; the seat 1 is movably arranged on the chassis 4, and when switching from a sitting state to a lying state, the lifting movement of the seat 1 can make the rotation angle of the lower back member 3 larger, thereby achieving more reasonable lumbar support; specifically, the lifting linkage mechanism includes a rocker 12, the rear end of the rocker 12 is relatively fixedly connected to the upper back member 2, the front end of the rocker 12 is rotatably connected to the seat 1, and the middle part of the rocker 12 is rotatably connected to the chassis 4; the lifting linkage mechanism also includes a guide portion 13, the guide portion 13 is installed below the seat 1, and the guide portion 13 is rotatably connected to the front end of the rocker 12 The chassis 4 is open upward and backward and is hollow. The guide part 13 is arranged in the chassis 4 from top to bottom. A guide member 14 and a guide groove 15 are arranged between the guide part 13 and the chassis 4. The guide member 14 is arranged in the guide groove 15. The guide groove 15 is inclined upward from front to back. The guide part 13 is configured so that when the backrest is reclined, the guide member 14 moves in the guide groove 15 and provides guidance for the movement direction of the seat 1. The linkage between the upper back member 2 and the seat 1 is realized by the seesaw 12. The raising and lowering of the upper back member 2 relative to the chassis 4 can also be directly driven by the reclining of the backrest without additional manual operation. The upper back member 2, the lower back member 3 and the seat 1 in the seat are all in a linkage relationship. The guide member 14 and the guide groove 15 limit the movement trajectory of the seat 1, making the linkage between the upper back member 2, the lower back member 3 and the seat 1 more reasonable. In addition to using the solution of this embodiment, the lifting linkage mechanism can also be replaced by a lifting connecting rod assembly to achieve the same effect. The lifting linkage mechanism of this embodiment has a simpler structure.

[0051] The seat 1 is arranged on the chassis 4, and the upper back member 2 is rotatably connected to the chassis 4. By adding the chassis 4 to the above-mentioned seat 1, upper back member 2, and lower back member 3, the diversity of movement can be achieved, that is, when the chassis 4 is fixed as a basis, the upper back member 2 is rotatably connected to the chassis 4 to achieve relative rotation with the seat 1. A movable connection can also be selectively set between the seat 1 and the chassis 4, so that the movement of the upper back member 2 is opposite to that of the seat 1, so that the lower back member 3 can have a larger rotation angle.

[0052] Furthermore, a rotating frame 16 is provided on the seat 1, and the rotating frame 16 is relatively fixed to the seat 1, and the rotating frame 16 is located at the rear of the seat 1, and the rotating frame 16 extends upward and is rotatably connected to the lower back member 3; the lower back member 3 is connected to the rotating frame 16 instead of being directly connected to the seat 1, on the one hand, the height of the lower back member 3 is raised, so that the lower back member 3 has a height similar to that of the existing seat in the sitting state, thereby achieving the desired function, and at the same time, the lower back member 3 will not interfere with the seat 1 when rotating, and the seat 1 can be effectively avoided; on the other hand, the lower back member 3 is rotatably connected to the rotating frame 16, which is obviously different from the rotation connection point of the upper back member 2, and in this case, the lower back member 3 can be rotated at a larger angle, so that the angle between the lower back member 3 and the upper back member 2 is reduced, thereby achieving the desired effect.

[0053] Specifically, the lower back member 3 is a frame structure, and the rotating frame 16 includes a fixing portion 161 located at its lower end, and the fixing portion 161 is fixedly connected to the rear end of the seat 1 by screws, and two divergent support arms 162 extend from the upper end of the rotating frame 16, and the two support arms 162 extend to the left and right sides respectively and tilt forward and upward, and finally the ends of the support arms 162 are rotatably connected to the middle and lower part of the lower back member 3 through a rotating shaft; in this embodiment, the rotating frame 16 is rotatably connected to the lower back member 3 and the middle or middle and lower part of the lower back member 3, and the rotating frame 16 is rotatably connected to the lower end of the lower back member 3, which can also achieve better waist support than the prior art, but the selection effect of this embodiment is better, the lower end of the lower back member 3 is vacant and located below the rotation connection point of the lower back member 3 and the rotating frame 16, and the lower end of the lower back member 3 can extend forward under the waist of the human body in a lying state for support, so as to provide more comfortable waist support.

[0054] like Figure 2 , 6As shown in 10-12, the upper back member 2 and the lower back member 3 form a supporting surface that fits the waist and back of the human body, and the seat portion 1 forms a seat surface that fits the buttocks of the human body. The supporting surface and the seat surface form a continuous fitting surface, and the fitting surface fits both the buttocks and the waist and back of the human body; because the existing chair backs are often curved backwards to improve comfort, so that the human body sinks into it and feels wrapped, in order to more accurately describe the fit between the chair back and the waist and back of the human body, the supporting surface has a reference line 17, and the reference line 17 is located in the middle of the supporting surface in the left-right direction, and the reference line 17 is a line connecting the upper end of the upper back member 2 to the lower end of the lower back member 3 on the supporting surface; in the sitting state, the reference line 17 is an S-shaped curve with a lower forward convexity. In the lying state, the reference line 17 is roughly a straight line with a certain backward curvature; specifically, the reference line 17 reflects the overall state of the supporting surface. In the sitting state, the reference line 17 is an S-shaped curve with a lower forward convexity, that is, in the sitting state, the lower back member 3 protrudes forward relative to the upper back member 2, and is used to press forward on the human waist to fit the S-shaped waist and back curve of the human body when sitting normally; in the lying state, the reference line 17 is roughly a straight line, that is, in the lying state, the angle between the lower back member 3 and the upper back member 2 is reduced, and the shape of the supporting surface is changed to fit the linear waist and back curve of the human body when lying.

[0055] In addition, when switching from a sitting position to a lying position, the supporting surface is close to the seat surface; when switching from a sitting position to a lying position, the supporting surface is close to the seat surface, which means that when switching from a sitting position to a lying position, the lower back part 3 rotates, and its lower end is close to the seat part 1, unlike a conventional chair where the lower back part 3 is far away from the seat part 1, so that the lower back part 3 and the seat part 1 will not separate to form a gap, thereby preventing the waist from being empty when the human body lies down.

[0056] In this embodiment, in the sitting state and the lying state, the fitting surface is continuous rather than disconnected, so that the buttocks, waist and back of the human body can all be pressed against the fitting surface, and the buttocks and waist and back of the human body can all be effectively and reasonably supported without the condition of an empty waist.

[0057] Although the back of the human body is roughly in a straight line, it is not advisable for the supporting surfaces of the lower back member 3 and the upper back member 2 to be completely straight. In the double-back structure, the reference line 17 at the upper back member 2 is generally a straight line, and the reference line 17 at the lower back member 3 is also a straight line. An angle will be generated between the lower back member 3 and the seat surface, without a smooth transition, and there will be a gap below the waist. If the lower back member 3 is designed with a rounded concave shape for lying, the effect of the convex fit support of the lower back member 3 when sitting normally will be lost, which is not worth the loss. Therefore, in this embodiment, a conventional convex lower back member 3 is used to ensure comfortable waist support in normal sitting posture. In the sitting posture, the human waist is supported by the middle and upper parts of the lower back member 3. The lower back member 3 and the upper back member 2 are respectively provided with support and fit the back of the human body, and when the sitting state is switched to the lying state, the lower back member 3 and the upper back member 2 rotate relative to each other, thereby changing the shape of the supporting surface, and the human body's waist is supported by the middle and lower part of the lower back member 3, relieving the convexity of the lower back member 3 so that the lower back member 3 and the upper back member 2 are roughly straight to fit the human body's waist and back; that is, while the supporting surface of the lower back member 3 is more smoothly transitioned to the supporting surface of the upper back member 2, the lower back member 3 still has a certain convexity to fill the gap and maintain sufficient waist support. The shape of the supporting surface is straighter, and the reference line 17 has a slight backward bend, so that the human body's waist and back remain roughly straight and rest reasonably and comfortably on the upper back member 2 and the lower back member 3.

[0058] Regarding the rotation angle, specifically, when switching from a sitting position to a lying position, the rotation angle of the lower back member 3 is greater than the rotation angle of the upper back member 2; in this way, the angle between the lower back member 3 and the upper back member 2 can be reduced; the reason why the rotation angle of the lower back member 3 is greater than the rotation angle of the upper back member 2 is because the rotation connection points of the lower back member 3 and the upper back member 2 are different, the upper back member 2 is rotationally connected to the chassis 4 and the lower back member 3 is rotationally connected to the rotating frame 16 on the seat 1.

[0059] Furthermore, if Fig.11 , 12 As shown, in the lying state, the inclination angle of the lower back part 3 relative to the ground is 13-20°, and in the present embodiment, in the lying state, the inclination angle of the lower back part 3 relative to the ground is 14°; in the sitting state, the angle between the lower back part 3 and the seat 1 is 115-120°, and in the lying state, the angle between the lower back part 3 and the seat is 158-165°, and in the present embodiment, the angle between the lower back part 3 and the seat in the sitting state is 116°, and in the lying state, the angle between the lower back part 3 and the seat is 160°; the rotation angle of the lower back part 3 is 43-50°, and in the present embodiment, the rotation angle of the lower back part 3 is 44°.

[0060] The inclination angle of the lower back part 3 relative to the ground in the lying state is significantly smaller than the inclination angle of the lower back part 3 in the existing seat, so that the inclination angle of the lower back part 3 relative to the vertical plane is larger, and its orientation is closer to upward to support the human waist; when changing from the sitting state to the lying state, the angle between the lower back part 3 and the seat 1 becomes larger. In the sitting state, the angle between the lower back part 3 and the seat 1 is similar to that of a conventional seat, but in the lying state, the angle between the lower back part 3 and the seat 1 is significantly larger, the lower back part 3 is more inclined, and the orientation of the lower back part 3 tends to be upward, which provides more reasonable support for the human waist and provides a more comfortable experience for the user; the rotation angle of the lower back part 3 is larger than that of the lower back part 3 of the existing seat. The purpose is to make the lower back part 3 more inclined and more reasonably oriented, so as to support the human waist in a better posture and improve comfort.

Claims

1. A sports chair back with lumbar support. It is characterized in that include: a seat portion configured to support a buttocks of a human body; A back assembly, including an upper back piece and a lower back piece; The upper back piece and the lower back piece are respectively arranged to rotate relative to the seat; An upper back member configured to support a back of a human body, the upper back member being located above the lower back member; A lower back member, configured to support the waist of a human body, the lower back member being disposed between the seat portion and the upper back member; The utility model has a sitting state and a lying state. In the sitting state, the lower back part and the upper back part are vertical and support the waist and back of the human body forward. In the lying state, the lower back part and the upper back part are inclined to support the inclined waist and back of the human body. In the sitting state and the lying state, the rear end of the seat always exceeds the front end of the lower back part backward.

2. The lumbar support sports chair back according to claim 1, Features: The connection point between the lower back piece and the seat portion is located in the middle of the lower back piece.

3. The lumbar support sports chair back according to claim 1, Features: A vertical rotating frame is fixedly connected to the rear end of the seat, the rotating frame protrudes upward from the upper surface of the seat, and the lower back piece is rotatably connected to the rotating frame.

4. The lumbar support sports chair back according to claim 3, Features: The rotating frame is rotatably connected to the lower back member at the middle of the lower back member. When the sitting position is switched to the lying position, the lower end of the lower back member moves from top to bottom and from back to front and extends under the waist of the human body.

5. The lumbar support sports chair back according to claim 1, Features: A back bracket is connected below the upper back piece, the back bracket is rotatably arranged relative to the seat, the lower end of the upper back piece is relatively fixedly connected to the upper end of the back bracket, and the upper end of the lower back piece is rotatably connected to the back bracket.

6. The lumbar support sports chair back according to claim 5, Features: The back support is L-shaped.

7. The lumbar support sports chair back according to claim 1, Features: The upper back part and the lower back part rotate independently. When the person changes from a sitting position to a lying position, the back of the human body presses against the upper back part, the upper back part tilts backward, and the waist of the human body pushes the lower back part to rotate.

8. The lumbar support sports chair back according to claim 1, Features: The lower back piece is rotatably connected to the upper back piece. When the sitting state is switched to the lying state, the back of the human body pushes the upper back piece to rotate relative to the seat, and the upper back piece drives the lower back piece to rotate relative to the seat.

Images