A seat with good waist and back fit

Abstract

The present invention relates to the field of seats, and is a seat with good waist and back fit, comprising a seat, a backrest installed above the seat, and a waist support body between the backrest and the rear end of the seat; the seat or tray is connected to a backrest support frame, and the lower end of the backrest is connected and fixed to the backrest support frame; the backrest comprises a support column at the center, and a plurality of elastic support units connected to the support column and arranged side by side up and down; the elastic support unit comprises a support body made of elastic material; the backrest support frame is annular, the waist support body is in the frame of the backrest support frame, the upper end of the waist support body is hinged on the backrest support frame, and the rear end of the waist support body is elastically connected to the seat or tray through a linkage rod. The seat has made innovations in the waist support structure, the backrest structure, and the installation structure to adapt to the waist support and the backrest. The waist support and backrest of the seat elastically support the waist and back of the passenger, and have good flexibility and high comfort.

Description

Technical Field

[0001] The invention relates to the field of seats, and in particular to a seat with good waist and back fit. Background Art

[0002] In recent years, with the development of social economy and the acceleration of people's pace of life, more and more people are busy studying and working, which leads to more and more people becoming sedentary. Therefore, whether the chair is safe and comfortable has become the primary requirement for people to choose a chair. Although the existing chairs have backrests, the backrest lines are stiff and do not meet the requirements of body curves. They cannot provide independent support for various parts of the body, and the support strength cannot be adjusted. After sitting for a long time, the body is prone to fatigue. Since the support strength cannot be adjusted, the support strength of various parts of the body is different. Over time, some parts of the body will feel uncomfortable and feel uncomfortable. Sitting for a long time may lead to lack of energy, body aches, chronic back problems, etc.

[0003] Based on the above-mentioned deficiencies of the prior art, the prior art, such as the Chinese utility model patent document with the announcement number "CN202445565U", records a fishbone arch chair back structure, which includes a leaning part and a bracket, the leaning part includes a bow-shaped frame and a plurality of pads, the bow-shaped frame includes a bow-shaped support part and a plurality of integrally formed backing plates, the backing plates are arranged horizontally and side by side on the bow-shaped support part to form a fishbone structure, the two ends of the bow-shaped frame are respectively connected to the upper end and the lower end of the bracket, each backing plate includes a fixing plate and a foam arranged on the fixing plate, and each fixing plate is fixedly connected to the backing plate at the corresponding position. Its beneficial effect is that the fishbone arch chair back structure conforms to the curve change of the human body, and can provide independent support to each part of the body, and the support strength is given according to the weight of each part of the body, so that the pressure on the back of the body is evenly distributed, avoiding the discomfort and chronic back problems caused by long-term sitting in certain parts of the body, and meeting the support needs of the sitter.

[0004] The above solutions all use an integrated pad to construct a fishbone-shaped chair back. This shape of the chair back can cover and fit the back of the occupant, so that the pressure on the back of the body is evenly distributed, and the ride is more comfortable. However, the pads in the above solutions are all hard support plates, and flexible contact is provided by the core layer [i.e., sponge] covered on the pad. However, when riding, twisting of the waist and back is often required, especially in an office communication environment; but the hard fishbone chair back will constrain the above movements. Although the core layer on the surface provides a certain twisting space, the above constraints still exist, affecting the user experience.

[0005] In addition, some existing chairs are also equipped with backrests. Currently, the backrests are generally upright or inclined. When the user leans his back against the backrest, there is a certain gap between the user's waist and the backrest, so that the back of the human body cannot be completely against the backrest, which reduces the supporting effect of the backrest on the back of the human body and reduces the comfort of use for the human body. In addition, there is a chair with a backrest and lumbar support on the market, but the lumbar support is fixed on the backrest and does not move. Because the position of the back against the lumbar support is different for different users, the comfort of use for the user is reduced.

[0006] On this basis, the Chinese utility model patent with the announcement number "CN204764436U" records a self-adjusting lumbar support for a seat, the key points of its technical solution are that it includes a lumbar support arranged on the backrest, the lumbar support is rotatably mounted on the surface of the backrest, a groove is arranged on the side surface of the lumbar support facing the backrest, an elastic adjustment member is arranged in the groove, and the elastic adjustment member contacts the surface of the backrest to adjust the position of the lumbar support. The self-adjusting lumbar support for a seat of the present invention can adjust the angle of the lumbar support on the backrest by rotating the lumbar support on the backrest and cooperating with the elastic adjustment member, thereby improving the use effect and comfort of the user on the seat. Although the above-mentioned lumbar support can adjust the angle when the user is sitting to adapt to the user's waist and back; however, due to its rotation position and elastic structure, the overall range of motion of the lumbar support is small and very limited.

[0007] In this small range of motion, elastic support for the lumbar support needs to be achieved, which will cause the stress of the elastic adjustment part of the lumbar support to be more concentrated. When the lumbar support is used, it will have a noticeable sense of pressure on the waist and back. Although this can ensure that it fits the human waist, its comfort level will be reduced. Summary of the invention

[0008] In order to solve the above problems, the purpose of the present invention is to provide a seat with good fit between the waist and back. The seat has made innovations in the lumbar support structure, the seat back structure and the installation structure to adapt to the lumbar support and the seat back. The lumbar support and seat back of the seat elastically support the waist and back of the occupant, have good flexibility and high comfort.

[0009] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0010] A chair with good waist and back fit, comprising a seat, a chair back mounted above the seat, and a waist support body between the chair back and the rear end of the seat; characterized in that: a chair back support frame is connected to the seat or tray, and the lower end of the chair back is connected and fixed to the chair back support frame; the chair back comprises a support column at the center, and a plurality of elastic support units connected to the support column and arranged side by side up and down; the elastic support unit comprises a support body made of elastic material, the support body is an arc-shaped body protruding backwards and opening forward, and a connecting part for connecting to the support column is arranged at the rear end center of the support body;

[0011] The chair back support frame is annular, and the lumbar support body is located in the frame of the chair back support frame. The upper end of the lumbar support body is hinged to the chair back support frame, and the rear end of the lumbar support body is connected to the seat or tray through a linkage rod. The upper end of the linkage rod is hinged to the lumbar support body, and the lower end of the linkage rod is hinged to the seat or tray. Torsion springs are provided on the upper and lower end hinge shafts of the linkage rod, and the linkage rod provides elastic supporting force forward to the lumbar support body.

[0012] The present invention adopts the above technical solution, which relates to a chair with good waist and back fit, which includes a seat, a backrest and a waist support body; this chair has made innovations in the waist support structure, the backrest structure and the installation structure to adapt to the waist support and the backrest, specifically the following points:

[0013] 1. The chair back has a support column at the center, and a plurality of elastic support units connected to the support column and arranged side by side. Each elastic support unit includes a support body, which is an arc-shaped body that protrudes backward and opens forward. The chair back is constructed as a whole in the shape of a fishbone as described in the background technology, which can adapt to the curve changes of the human body and can provide independent support to each part of the body. The support strength is given according to the weight of each part of the body, so that the pressure on the back of the body is evenly distributed. On this basis, each elastic support unit in this scheme is independently arranged, and the support body in each elastic support unit is made of elastic material; in this way, the deformation space of each elastic support unit is large, and on the basis of closely fitting the waist and back curve of the human body, it can flexibly and adaptively fit based on the twisting of the waist and back of the occupant, and the comfort is better; and based on the above characteristics, the chair back reduces the riding constraints on the occupant and improves the use experience.

[0014] 2. The top of the lumbar support body in this solution is rotatably connected to the bottom of the chair back, and the lower end is elastically supported. When in use, it can be automatically adjusted along the hinged end according to the sitting posture of the occupant, so as to achieve adaptive fit to the human waist curve. On this basis, the rear end of the lumbar support body in this solution is connected to the seat or tray through a linkage rod. The upper and lower ends of the linkage rod are hinged, and a torsion spring is provided on the hinged end to provide elastic support force. Based on the above structure, the lumbar support body adopts linkage support, and the lumbar support body has a larger range of motion, which is suitable for fitting the human waist in more sitting postures, such as when adjusting the reclining angle of the chair back; and the linkage support can disperse the stress; during the adjustment process, the support force on the waist is evenly distributed, and the comfort can be felt; there will be no obvious sense of oppression.

[0015] 3. The chair seat or tray in the above scheme is connected to a chair back support frame, which is annular; the lower end of the chair back is connected and fixed to the chair back support frame, the lumbar support body is in the frame of the chair back support frame, and the upper end of the lumbar support body is hinged to the chair back support frame. In this way, the chair back support frame in this scheme is a connecting support bracket for the chair back and the lumbar support body, and its annular structure provides space for the movable setting of the lumbar support body.

[0016] Preferably, the elastic support unit further comprises a flexible core layer laid on the front end surface of the support body, and a surface layer wrapped around the outside of the flexible core layer; the edge of the surface layer is fixed on the support body. In this technical solution, the flexible core layer is laid on the front end surface of the elastic support body, further improving the comfort of the chair back.

[0017] Preferably, the support body includes a base plate and an inner lining plate, each made of elastic material. The inner lining plate covers the front end surface of the base plate and is connected and fixed to the base plate; the connecting portion is connected to the base plate; the flexible core layer is laid on the front end surface of the inner lining plate, and the edge of the surface layer is clamped between the base plate and the inner lining plate. In this scheme, the support body is divided into a base plate and an inner lining plate, each made of elastic material. On the basis of connecting and fixing the inner lining plate to the base plate, the edge of the surface layer is clamped between the base plate and the inner lining plate, thereby playing a role of clamping and fixing the surface layer, and at the same time, the surface layer can cover the flexible core layer on the front end surface of the inner lining plate. Compared with the traditional scheme in which the edge of the surface layer is fixed by means of gun nails, this scheme, on the one hand, takes into account that the support body is a flexible material and it is difficult to fix gun nails; on the other hand, this scheme can facilitate the disassembly and assembly of the surface layer and the flexible core layer.

[0018] Preferably, the connecting portion is an elastic connecting portion integrally constructed with the base plate; in this technical solution, the connecting portion and the base plate are integrally formed to form an elastic connecting portion; on the one hand, molding is more convenient, and on the other hand, the elastic connecting portion can produce a certain deformation amount relative to the supporting column. Since the elastic connecting portion is close to the axis point of the entire elastic support unit, the deformation amount of this part can increase the torsional range of the entire elastic support unit, thereby increasing its adjustment space.

[0019] The connecting part is a collar, an axial hole is provided inside the collar, and a connecting hole communicating with the axial hole inside the collar is provided at the center of the front end of the base plate; the collar of the elastic support unit is passed through the support column, and a threaded hole is provided on the support column. The screw-fixing component passes through the connecting hole and is connected to the threaded hole, so that the elastic support unit can be connected and fixed to the support column. During installation, the connecting part of the elastic support unit is inserted from the upper end of the support column, and after moving to a suitable position, it is connected to the threaded hole of the support column by bolts passing through the connecting hole to fix the axial positioning height; in this scheme, the elastic support unit is installed by a sleeve connection method, the installation process is convenient, and the structure is stable after installation. Further, the connecting hole is opened at the front end of the base plate, and the connecting hole can be hidden after the installation is completed.

[0020] Preferably, a headrest mounting seat is provided with a longitudinal sliding sleeve on the top of the support column, and a headrest is hinged on the headrest mounting seat, and the headrest can be rotated up and down relative to the headrest mounting seat along its hinged end; the headrest includes an elastic support unit, and the elastic support unit includes a support body made of elastic material, the support body is an arc-shaped body protruding backward and with an opening facing forward, and a connecting portion for connecting to the headrest mounting seat is provided at the rear end center of the support body.

[0021] In a further solution, a hinge groove is provided on the headrest mounting seat, the connecting part of the headrest is a rotating shaft, and an axial hole is provided in the center of the rotating shaft; the screw-fixed component passes through the axial hole and is connected to the hinge groove; and circumferentially matching positioning teeth are provided on the side wall of the hinge groove and at least one of the axial side walls of the rotating shaft.

[0022] In the above scheme, a headrest is also formed above the chair back, and the headrest is also constructed by the above single elastic support unit. It has the above flexible support effect. Furthermore, the headrest is rotatably arranged on the headrest mounting seat, and the height of the headrest can be adjusted based on the longitudinal sliding of the headrest mounting seat. The headrest can be rotated relative to the headrest mounting seat to adjust its angle, and the angle positioning is achieved through the positioning teeth.

[0023] Preferably, the front end of the lumbar support body is constructed with an arc-shaped support surface that protrudes forward and opens backward. In this technical solution, the arc-shaped elastic support surface can adaptively fit based on the waist curve it relies on, and on the other hand, combined with the above-mentioned linkage support structure, when sitting, the human waist will provide an oblique downward force to the arc-shaped elastic support surface, and the direction of the force is in the same direction as the rotation direction of the lumbar support body, so that the lumbar support body can rotate along its hinged end and the support of the linkage rod is smoother.

[0024] Preferably, a support rod is fixedly connected or integrally extended to the rear middle and lower part of the rear end of the lumbar support body, and the upper end of the linkage rod is respectively hinged to the support rod. In this technical solution, the support rod is used to be hinged to the linkage rod and transmit the force of the lumbar support body to the linkage rod.

[0025] Preferably, the tray is a reclining tray, and the lower end of the linkage rod is arranged on the movable part of the tray and can rotate relative to the movable part of the tray. In this technical solution, the backrest support frame and the backrest and lumbar support body connected thereto can be tilted and swung based on the reclining tray; during the reclining process, the lumbar support body can adaptively fit the waist of the occupant due to the large range of linkage support activities of the lumbar support body, and the comfort is good.

[0026] In a specific solution, the rear end of the reclining tray is linked with a telescopic adjustment component, the rear end of the telescopic adjustment component is connected to a mounting seat, the lower end of the seat back support frame is locked and fixed by the mounting seat, and the lower end of the linkage rod is hinged on the mounting seat. The telescopic adjustment component is used for sliding adjustment during installation, which is suitable for adjustment of differences between different models or adjustment of process errors of the same product. The setting of the mounting seat, on the one hand, fixes the seat back support frame, and on the other hand, provides a basis for the articulation of the linkage rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a frontal perspective view of a seat.

[0028] Figure 2 The present invention is a three-dimensional view of the back side of the seat involved.

[0029] Figure 3 The present invention is to create a seat side view.

[0030] Figure 4 This is a schematic diagram of the elastic support unit being separated from the seat.

[0031] Figure 5 This is a structural diagram of the elastic support unit.

[0032] Figure 6 Schematic diagram of the installation structure of the headrest. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] like Figures 1 to 6As shown, this embodiment relates to a chair with good waist and back fit, including a seat 1, a chair back 2 installed above the seat 1, and a waist support body 3 between the chair back 2 and the rear end of the seat 1. This chair has made innovations in the waist support structure, the chair back 2 structure, and the installation structure to adapt to the waist support and the chair back 2. The details are as follows:

[0039] like Figure 2-4 As shown, the seat 1 or tray 4 is connected to a backrest support frame 5, and the lower end of the seat back 2 is connected and fixed to the backrest support frame 5; the backrest support frame 5 is annular, the lumbar support body 3 is in the frame of the seat back 2 support frame, and the upper end of the lumbar support body 3 is hinged to the backrest support frame 5. The seat 1 or tray 4 in this solution is connected to a backrest support frame 5, and the backrest support frame 5 is annular. The lower end of the seat back 2 is connected and fixed to the backrest support frame 5, the lumbar support body 3 is in the frame of the backrest support frame 5, and the upper end of the lumbar support body 3 is hinged to the backrest support frame 5. In this way, the backrest support frame 5 in this solution is, on the one hand, a connecting support bracket for the seat back 2 and the lumbar support body 3, and on the other hand, its annular structure provides space for the movable setting of the lumbar support body 3.

[0040] like Figure 1-4 As shown, the chair back 2 includes a support column 6 at the center, and a plurality of elastic support units 7 connected to the support column 6 and arranged side by side. The elastic support unit 7 includes a support body made of elastic material, the support body is an arc-shaped body protruding backward and opening forward, and a connecting portion 73 for connecting to the support column 6 is provided at the center of the rear end of the support body. The chair back 2 is constructed as a whole in a fishbone shape as described in the background technology, which adapts to the curve changes of the human body and can provide independent support to each part of the body. The support strength is given according to the weight of each part of the body, so that the load on the back of the body is evenly distributed. On this basis, each elastic support unit 7 in this scheme is independently arranged, and the support body in each elastic support unit 7 is made of elastic material. In this way, the deformation space of each elastic support unit 7 is large, and on the basis of being close to the waist and back curve of the human body, it can be flexibly adaptively fitted based on the twisting of the waist and back of the occupant, and the comfort is more. Based on the above characteristics, the chair back 2 reduces the riding constraints of the occupant and improves the use experience.

[0041] In a further solution, the elastic support unit 7 also includes a flexible core layer [omitted in the figure] laid on the front end surface of the support body, and a surface layer [omitted in the figure] coated on the outside of the flexible core layer. The edge of the surface layer is fixed on the support body. In this technical solution, the flexible core layer is laid on the front end surface of the elastic support body to further improve the comfort of the chair back 2. The support body includes a base plate 71 and an inner lining plate 72, each made of elastic material. The inner lining plate 72 is covered on the front end surface of the base plate 71 and is connected and fixed to the base plate 71. The connecting portion 73 is connected to the base plate 71. The flexible core layer is laid on the front end surface of the inner lining plate 72, and the edge of the surface layer is clamped between the base plate 71 and the inner lining plate 72. In this solution, the support body is divided into a base plate 71 and an inner lining plate 72, each made of elastic material. On the basis of connecting and fixing the inner lining plate 72 to the base plate 71, the edge of the surface layer is clamped between the base plate 71 and the inner lining plate 72, so as to clamp and fix the surface layer. At the same time, the surface layer can cover the flexible core layer on the front end surface of the inner lining plate 72. Compared with the traditional solution in which the edge of the surface layer is fixed by nail guns, this solution, on the one hand, takes into account that the support body is made of flexible materials and it is difficult to fix nail guns. On the other hand, this solution can facilitate the disassembly and assembly of the surface layer and the flexible core layer.

[0042] Preferably, the connecting portion 73 is an elastic connecting portion integrally constructed with the base plate 71. Here, the connecting portion 73 is integrally formed with the base plate 71 to form an elastic connecting portion. On the one hand, molding is more convenient, and on the other hand, the elastic connecting portion 73 can produce a certain deformation relative to the support column 6. Since the elastic connecting portion 73 is close to the axis point of the entire elastic support unit 7, the deformation of this part can increase the torsion range of the entire elastic support unit 7, making its adjustment space larger. In a specific implementation scheme, the connecting portion 73 is a collar, and an axial hole is provided inside the collar, and a connecting hole communicating with the inside of the axial hole of the collar is provided at the center of the front end of the base plate 71. The collar of the elastic support unit 7 is penetrated on the support column 6, and a threaded hole is provided on the support column 6. The screw-fixed component passes through the connecting hole and is connected to the threaded hole, so that the elastic support unit 7 can be connected and fixed to the support column 6. During installation, the connection part 73 of the elastic support unit 7 is inserted from the upper end of the support column 6, and after being moved to a suitable position, it is connected to the threaded hole of the support column 6 by bolts passing through the connection hole to fix the axial height. In this solution, the elastic support unit 7 is installed in a sleeve connection manner, which is convenient for the installation process and has a stable structure after installation. Further, the connection hole is opened at the front end of the base plate 71, so that the connection hole can be hidden after the installation is completed.

[0043] In addition, Figure 4 and 6As shown, the top of the support column 6 is provided with a headrest mounting seat 8 on which a headrest 81 is hinged, and the headrest 81 can rotate up and down relative to the headrest mounting seat 8 along its hinged end. The headrest 81 includes an elastic support unit 7, which includes a support body made of elastic material, the support body is an arc-shaped body protruding backward and opening forward, and a connecting portion 73 for connecting to the headrest mounting seat 8 is provided at the rear end center of the support body. In a further scheme, a hinge groove 82 is provided on the headrest mounting seat 8, and the connecting portion 73 of the headrest 81 is a rotating shaft, and a shaft hole is provided at the center of the rotating shaft. The screw-fixed component is connected to the hinge groove 82 through the shaft hole. The side wall of the hinge groove 82 and at least one side wall of the axial side walls of the rotating shaft are provided with circumferentially matched positioning teeth. In the above scheme, a headrest 81 is also formed above the chair back 2, and the headrest 81 is also constructed by the above single elastic support unit 7. It has the above flexible support effect. Furthermore, the headrest 81 is rotatably arranged on the headrest mounting seat 8, and the height of the headrest 81 can be adjusted based on the longitudinal sliding of the headrest mounting seat 8. The angle of the headrest 81 can be adjusted by rotating it relative to the headrest mounting seat 8, and the angle positioning is achieved by the positioning teeth.

[0044] like Figure 2 and 3 As shown, the rear end of the lumbar support body 3 is connected to the seat 1 or the tray 4 through a linkage rod 9, the upper end of the linkage rod 9 is hinged to the lumbar support body 3, and the lower end of the linkage rod 9 is hinged to the seat 1 or the tray 4. Torsion springs are provided on the upper and lower hinge shafts of the linkage rod 9, and the linkage rod 9 provides elastic support force to the lumbar support body 3 in the forward direction. The top of the lumbar support body 3 in this scheme is rotatably connected to the bottom of the chair back 2, and the lower end is elastically supported. When in use, it can be automatically adjusted along the hinge end according to the sitting posture of the occupant, so as to achieve adaptive fit to the human waist curve. On this basis, the rear end of the lumbar support body 3 in this scheme is connected to the seat 1 or the tray 4 through a linkage rod 9, the upper and lower ends of the linkage rod 9 are hinged, and a torsion spring is provided on the hinge end to provide elastic support force. Based on the above structure, the lumbar support body 3 adopts linkage support, and the range of movement of the lumbar support body 3 is larger, which is suitable for fitting the human waist in more sitting postures, such as when adjusting the reclining angle of the chair back 2. And the linkage support can disperse the stress. During the adjustment process, the support force on the waist is evenly distributed, and you can feel comfortable without any obvious sense of oppression.

[0045] In a further solution, the front end of the lumbar support body 3 is constructed with an arc-shaped support surface that protrudes forward and opens to the rear. In this technical solution, on the one hand, the arc-shaped elastic support surface can be adaptively fitted based on the waist curve it relies on, and on the other hand, combined with the above-mentioned linkage support structure, when sitting, the human waist will provide an oblique downward force to the arc-shaped elastic support surface, and the direction of the force is the same as the rotation direction of the lumbar support body 3, so that the lumbar support body 3 rotates along its hinged end and the support of the linkage rod 9 is smoother. In addition, the middle and lower part of the rear end of the lumbar support body 3 is connected and fixed backward or extended as a whole with a support rod 31, and the upper end of the linkage rod 9 is respectively hinged to the support rod 31; the support rod 31 is used to be hinged to the linkage rod 9 and transmit the force of the lumbar support body 3 to the linkage rod 9.

[0046] Finally, the tray 4 is a reclining tray, and the lower end of the linkage rod 9 is arranged on the movable part of the tray 4 and can rotate relative to the movable part 41 of the tray 4. In this technical solution, the backrest support frame 5 and the backrest 2 and lumbar support body 3 connected thereto can be tilted and swung based on the reclining tray. During the reclining process, due to the large range of linkage support activities of the lumbar support body 3, the lumbar support body 3 adaptively fits the waist of the passenger, and the comfort is good. In the specific solution, the rear end of the reclining tray is linked with a telescopic adjustment component 42, the rear end of the telescopic adjustment component 42 is connected to the mounting seat 43, the lower end of the backrest support frame 5 is locked and fixed by the mounting seat 43, and the lower end of the linkage rod 9 is hinged on the mounting seat 43. The telescopic adjustment component 42 is used for sliding adjustment during installation, which is suitable for adjustment of differences in different models or adjustment of process errors of the same product. The setting of the mounting seat 43, on the one hand, fixes the backrest support frame 5, and on the other hand, provides a basis for the articulation of the linkage rod 9.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0048] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A chair with good waist and back fit, comprising a seat (1), a chair back (2) installed above the seat (1), and a waist support body (3) located between the chair back (2) and the rear end of the seat (1); characterized in that: The seat (1) or the tray (4) is connected to a backrest support frame (5), and the lower end of the backrest (2) is connected and fixed to the backrest support frame (5); the backrest (2) comprises a support column (6) at the center, and a plurality of elastic support units (7) connected to the support column (6) and arranged side by side in an upper and lower manner; the elastic support unit (7) comprises a support body made of elastic material, a flexible core layer laid on the front end surface of the support body, and a surface layer coated on the outer side of the flexible core layer; the edge of the surface layer is fixed on the support body, The supporting body comprises a base plate (71) and an inner lining plate (72) respectively made of elastic materials, wherein the inner lining plate (72) covers the front end surface of the base plate (71) and is connected and fixed to the base plate (71); the flexible core layer is laid on the front end surface of the inner lining plate (72), and the edge of the surface layer is sandwiched between the base plate (71) and the inner lining plate (72); The support body is an arc-shaped body protruding backwards and with an opening facing forwards, and a connecting portion (73) for connecting to the support column (6) is provided at the center of the rear end of the support body; the connecting portion (73) is an elastic connecting portion integrally constructed with the base plate (71); the connecting portion (73) is a sleeve ring, an axial hole is provided inside the sleeve ring, and a connecting hole communicating with the axial hole inside the sleeve ring is provided at the center of the front end of the base plate (71); the sleeve ring of the elastic support unit (7) is passed through the support column (6) and can be fixed on the support column (6); The backrest support frame (5) is annular, the lumbar support body (3) is located in the backrest support frame (5), the upper end of the lumbar support body (3) is hinged on the backrest support frame (5), the rear end of the lumbar support body (3) is connected to the seat (1) or the tray (4) through a linkage rod (9), the upper end of the linkage rod (9) is hinged to the lumbar support body (3), and the lower end of the linkage rod (9) is hinged to the seat (1) or the tray (4); torsion springs are provided on the upper and lower end hinge shafts of the linkage rod (9), and the linkage rod (9) provides a forward elastic support force to the lumbar support body (3).

2. A seat with good waist and back fit according to claim 1, characterized in that: The support column (6) is provided with a threaded hole, and the screw-fixing component passes through the connection hole and is connected to the threaded hole, so that the elastic support unit (7) can be connected and fixed to the support column (6).

3. A seat with good waist and back fit according to claim 1, characterized in that: A headrest mounting seat (8) is longitudinally slidably sleeved on the top of the support column (6), and a headrest (81) is hinged on the headrest mounting seat (8). The headrest (81) can rotate up and down relative to the headrest mounting seat (8) along its hinged end; the headrest (81) comprises an elastic support unit (7), and the elastic support unit (7) comprises a support body made of elastic material, the support body is an arc-shaped body protruding backwards and opening forwards, and a connecting portion (73) for connecting to the headrest mounting seat (8) is arranged at the rear end center of the support body.

4. A seat with good waist and back fit according to claim 3, characterized in that: The headrest mounting seat (8) is provided with a hinge groove (82); the connecting portion (73) of the headrest (81) is a rotating shaft, and a shaft hole is provided at the center of the rotating shaft; the screw-fastening component passes through the shaft hole and is connected to the hinge groove (82); and the side wall of the hinge groove (82) and at least one of the two axial side walls of the rotating shaft are provided with circumferentially matched positioning teeth.

5. The seat with good waist and back fit according to claim 1, characterized in that: The front end of the lumbar support body (3) is formed with an arc-shaped support surface which protrudes forward and opens toward the rear.

6. A seat with good waist and back fit according to claim 5, characterized in that: A support rod (31) is fixedly connected or integrally extended backwards at the middle and lower part of the rear end of the lumbar support body (3), and the upper end of the linkage rod (9) is respectively hinged to the support rod (31).

7. A seat with good waist and back fit according to claim 5, characterized in that: The tray (4) is a tilting tray, and the lower end of the linkage rod (9) is arranged on the movable part (41) of the tray (4) and can rotate relative to the movable part (41) of the tray (4).

8. A seat with good waist and back fit according to claim 7, characterized in that: The rear end of the tilt tray is linked to a telescopic adjustment component (42), the rear end of the telescopic adjustment component (42) is connected to a mounting seat (43), the lower end of the chair back support frame (5) is locked and fixed by the mounting seat (43), and the lower end of the linkage rod (9) is hinged on the mounting seat (43).

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