CN114209173A

CN114209173A - Seat with good waist and back fitting degree

Info

Publication number: CN114209173A
Application number: CN202111388091.7A
Authority: CN
Inventors: 贺小余; 钟红兴; 黄鉴熠
Original assignee: Dakang Holding Co Ltd
Current assignee: Dakang Holding Co Ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-03-22

Abstract

The invention relates to the field of chairs, in particular to a chair with good waist and back fitting degree, which comprises a chair seat, a chair back arranged above the chair seat and a waist rest body positioned between the chair back and the rear end part of the chair seat; the chair seat or the tray is connected with a chair back supporting frame, and the lower end of the chair back is connected and fixed on the chair back supporting frame; the chair back comprises a supporting upright post positioned at the center and a plurality of elastic supporting units which are connected to the supporting upright post and are arranged side by side up and down; the elastic supporting unit comprises a supporting main body made of elastic materials; the back of the chair braced frame is cyclic annular, and the waist leans on the body to be in back of the chair braced frame's frame, and the upper end that the waist leaned on the body articulates on back of the chair braced frame, and the back end that the waist leaned on the body passes through the gangbar elastic connection seat support or tray on. The chair has the advantages that innovations are made on the waist support structure, the chair back structure and the mounting structure suitable for the waist support and the chair back, the waist support and the chair back of a seat occupant are elastically supported, the flexibility is good, and the use comfort level is high.

Description

Seat with good waist and back fitting degree

Technical Field

The invention relates to the field of seats, in particular to a seat with good waist and back fitting degree.

Background

In recent years, with the development of social economy, the pace of life of people is accelerated, more and more people are rushed to work and study, and more people become a family of sedentariness. Therefore, whether the chair is safe and comfortable becomes the first requirement for people to select the chair. Although the existing chair has a chair back, the lines of the chair back are stiff and do not meet the requirement of body curves, independent support can not be provided for all parts of the body, the support force can not be adjusted, the sitting time is long, the body is easy to fatigue, and because the support force can not be adjusted, the support force applied to all parts of the body is different, certain parts of the body can be uncomfortable after a long time, the people feel uncomfortable, and the people can feel weak, are sore and ache all over the body and have chronic back problems due to the long-time sitting.

Based on the weak point of above-mentioned prior art, prior art is as chinese utility model patent text record of "CN 202445565U" back of the chair structure of fishbone bow type, and it includes leaning on portion and support, leaning on portion includes a bow type skeleton and several backing plate, bow type skeleton includes bow type supporting part and its integrated into one piece's several backup plate, the backup plate transversely sets up side by side on bow type supporting part in order to form fishbone column structure, the both ends of bow type skeleton connect respectively in the upper end and the lower extreme of support, every backing plate include a fixed plate and set up the bubble cotton on the fixed plate, every fixed plate and the backup plate fixed connection who corresponds the position. The beneficial effects are that: the fishbone-arch chair back structure conforms to the curve change of a human body, and can provide independent support for each part of the body, and the support force gives corresponding support force according to the weight of each part of the body, so that the load on the back of the body is uniformly distributed, the problems of discomfort and chronic back of some parts of the body due to long-time sitting are avoided, and the support requirement of a sitting person is met.

Above-mentioned scheme all constructs the back of the chair of fishbone shape through integrative backing plate, and the back of the chair back of this shape can the cladding and laminate the person's of taking for the load of health back presents evenly distributed, and it is more comfortable to take the sense. However, the backing plates in the above solutions are all hard support plates, and flexible contact is provided by a core layer (i.e. referred to as sponge) covered on the backing plate. However, twisting of the waist and back is often required when riding, especially in an office communication environment; however, the hard fishbone chair back can restrict the movement, and although the core layer on the surface provides a certain twisting space, the restriction still exists, which affects the use experience.

In addition, still can be equipped with the back on some current seats, present back is generally vertical type or oblique vertical, the user pastes the back when leaning on the back, because can have certain space between user's back waist and the back, make the unable complete of human back paste on the back, the supporting role of back to human back has been reduced, make human use comfort level have been reduced, a seat that has back lumbar support on the market in addition, but the lumbar support is for fixing motionless on the back, because the different backs of user paste the position of leaning on at the lumbar support also can be different, make use comfort level who has reduced the user.

On this basis, it states a self-interacting waist in the chinese utility model patent text that the publication number is "CN 204764436U" and leans on for on the seat, and its technical scheme main points are including setting up the waist on the back and lean on, the waist is leaned on to rotate and is installed on the back surface, a side surface that the waist leaned on towards the back is provided with the recess, be equipped with the elasticity regulating part in the recess, the elasticity regulating part is contradicted the back surface and is used for adjusting and reply the waist and lean on the position. The self-adjusting waist rest for the seat can adjust the angle of the waist rest on the backrest by rotating the waist rest on the backrest and matching with the elastic adjusting piece, so that the using effect and the comfort degree of a user on the seat are improved. The angle of the waist support can be adjusted when a user sits so as to be adaptive to the waist and the back of the user; but the whole moving range of the waist rest is small and very limited because of the limit of the rotating position and the elastic structure.

The waist support is required to be elastically supported within the small moving range, so that stress of the elastic adjusting piece for supporting the waist support is concentrated, the waist support can generate obvious oppression to the waist when in use, and the waist support can be attached to the waist of a human body, but the use comfort of the waist support can be reduced.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a seat with a good waist-back fit, in which innovations are made on a waist rest structure, a seat back structure and a mounting structure for adapting to the waist rest and the seat back, the waist rest and the seat back elastically support the waist back of a seat occupant, and the seat has good flexibility and high comfort level.

In order to achieve the purpose, the invention adopts the following technical scheme:

a chair with good waist and back fitting degree comprises a chair seat, a chair back arranged above the chair seat and a waist rest body positioned between the chair back and the rear end part of the chair seat; the method is characterized in that: the chair seat or the tray is connected with a chair back supporting frame, and the lower end of the chair back is connected and fixed on the chair back supporting frame; the chair back comprises a supporting upright post positioned at the center and a plurality of elastic supporting units which are connected to the supporting upright post and are arranged side by side up and down; the elastic supporting unit comprises a supporting main body made of elastic materials, the supporting main body is an arc-shaped body which protrudes backwards and has a forward opening, and a connecting part used for being connected to the supporting upright post is arranged at the center of the rear end of the supporting main body;

the chair back support frame is annular, the lumbar support body is positioned in the frame of the chair back support frame, the upper end part of the lumbar support body is hinged to the chair back support frame, the rear end part of the lumbar support body is connected to the chair seat or the tray through the linkage rod, the upper end part of the linkage rod is hinged to the lumbar support body, and the lower end part of the linkage rod is hinged to the chair seat or the tray; the articulated shafts at the upper and lower ends of the linkage rod are respectively provided with a torsional spring, and the linkage rod provides elastic supporting force to the front of the waist rest body.

The invention adopts the technical scheme, and relates to a chair with good waist and back fitting degree, which comprises a chair seat, a chair back and a waist rest body; the chair is characterized in that innovations are made in a waist rest structure, a chair back structure and a mounting structure suitable for the waist rest and the chair back, and the chair specifically comprises the following points:

1, this back of the chair is in the support post of center department to and connect on the support post and polylith elastic support unit that arranges side by side from top to bottom, every elastic support unit all includes the support subject, and the support subject is the arc body that backward protrusion and opening forward. The chair back is integrally constructed into the fishbone shape recorded in the background technology, adapts to the curve change of a human body, can independently support each part of the body, and provides corresponding supporting force according to the weight of each part of the body, so that the load of the back of the body is evenly distributed. On the basis, each elastic supporting unit in the scheme is arranged independently, and the supporting body in each elastic supporting unit is made of elastic materials; therefore, the deformation space of each elastic supporting unit is large, and the elastic supporting units can flexibly and adaptively fit on the basis of the twisting condition of the waist and back of a rider on the basis of clinging to the curve of the waist and back of the human body, so that the comfortable feeling is better; based on the above characteristics, the seat back has a reduced seating restriction on the occupant and an improved use experience.

2, the top of the waist support body in this scheme is rotated and is connected in back of the chair below, and lower tip is by elastic support, can follow hinged end automatic adjustment according to the position of sitting of the person of taking during the use to this realizes the human waist curve of self-adaptation laminating. On this basis, the back tip of the waist in this scheme leans on the body passes through on the gangbar connects seat support or tray, and the upper and lower both ends of gangbar are articulated to be set up, and are provided with the torsional spring on the articulated end and provide elastic support power. Based on the structure, the waist rest body adopts linkage type support, the movable range of the waist rest body is larger, and the waist rest body is suitable for fitting the waist of a human body under more sitting postures, such as adjusting the inclination angle of a chair back; the linkage type support can disperse stress; in the adjusting process, the supporting force applied to the waist is evenly distributed, so that the comfort can be felt by the body; no obvious oppressive feeling exists.

3, a chair back supporting frame is connected to the chair seat or the tray in the scheme and is annular; the lower end of the chair back is fixedly connected with the chair back supporting frame, the lumbar support body is positioned in the frame of the chair back supporting frame, and the upper end part of the lumbar support body is hinged on the chair back supporting frame. Therefore, the chair back support frame in the scheme is a connecting support bracket for the chair back and the lumbar support body on one hand, and the annular structure of the chair back support frame provides space for the movable arrangement of the lumbar support body on the other hand.

Preferably, the elastic supporting unit further comprises a flexible core layer laid on the front end face of the supporting main body, and a surface layer coated on the outer side of the flexible core layer; the edges of the facing are fixed to the support body. In the technical scheme, the flexible core layer is laid on the front end face of the elastic support main body, so that the comfort of the chair back is further improved.

Preferably, the support body comprises a base plate and an inner lining plate which are respectively made of elastic materials, and the inner lining plate covers the front end face of the base plate and is fixedly connected with the base plate; the connecting part is connected with the base plate; the flexible core layer is laid on the front end face 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, divide into base plate and interior welt by elastic material respectively with the support subject, on the basis of fixing interior welt connection at the base plate, press from both sides the edge of surface course and establish between base plate and interior welt to play the effect of cliping fixed surface course, the surface course can be with flexible core layer cladding on interior welt preceding terminal surface simultaneously. Compared with the traditional scheme that the edge of the surface layer is fixed in a gun nail mode, the scheme considers that the supporting main body is made of flexible materials and the gun nail is difficult to fix on one hand; another aspect is that the solution enables easy disassembly of the facing and flexible core layers.

Preferably, the connecting part is an elastic connecting part integrally constructed with the base plate; in the technical scheme, the connecting part and the base plate are integrally formed to form an elastic connecting part; on one hand, the forming is more convenient, on the other hand, the elastic connecting part can generate a certain deformation amount relative to the supporting upright column, and the elastic connecting part is close to the shaft point of the whole elastic supporting unit, so that the partial deformation amount can improve the twisting range of the whole elastic supporting unit, and the adjusting space of the elastic supporting unit is larger.

The connecting part is a lantern ring, a shaft hole is formed in the lantern ring, and a connecting hole communicated with the inside of the shaft hole of the lantern ring is formed in the center of the front end of the base plate; the lantern ring of elastic support unit wears to establish on the support post, is equipped with the screw hole on the support post, and the solid part of spiral shell passes the connecting hole and connects on the screw hole, can fix the elastic support unit connection on the support post. When the device is installed, the connecting part of the elastic supporting unit is sleeved in the upper end of the supporting upright post, and the elastic supporting unit is moved to a proper position and then is connected in the threaded hole of the supporting upright post through the connecting hole through a bolt to be fixed so as to axially position the height; in this scheme, adopt the mode of cup jointing installation elastic support unit, the installation is convenient, and installation back stable in structure. Further, the connecting hole is formed in the front end of the base plate, and the connecting hole can be hidden after the installation is completed.

Preferably, the top of the support upright post is longitudinally slidably sleeved with a headrest mounting seat, a headrest is hinged to the headrest mounting seat, and the headrest can vertically rotate relative to the headrest mounting seat along the hinged end of the headrest; the headrest comprises an elastic supporting unit, the elastic supporting unit comprises a supporting main body made of elastic materials, the supporting main body is an arc-shaped body protruding backwards and provided with a forward opening, and a connecting portion used for being connected to a headrest mounting seat is arranged at the center of the rear end of the supporting main body.

In a further scheme, a hinge groove is arranged on the headrest mounting seat, a connecting part of the headrest is a rotating shaft, and a shaft hole is formed in the center of the rotating shaft; the screwing component passes through the shaft hole and is connected to the hinge groove; and at least one side wall of the hinge groove and the axial two side walls of the rotating shaft is provided with positioning teeth which are matched in the circumferential direction.

In the above solution, a headrest is also formed above the seat back, and the headrest is also constructed by the above single elastic support unit. The flexible support effect is achieved. Further, the headrest is rotatably arranged on the headrest mounting seat, the height of the headrest can be adjusted based on the longitudinal sliding of the headrest mounting seat, the angle of the headrest can be adjusted through the rotation of the headrest relative to the headrest mounting seat, and the angle positioning is realized through the positioning teeth.

Preferably, the front end of the lumbar support body is provided with an arc-shaped supporting surface which protrudes forwards and is opened backwards. Among this technical scheme, the curved elastic support face of arc can be based on the curved self-adaptation laminating of waist that relies on the one hand, and on the other hand combines above-mentioned coordinated type bearing structure, and human waist can provide a slant decurrent power to curved elastic support face when taking, and this effort direction is the syntropy with the rotation direction of waist by the body to make the waist by the body along its hinged end rotation and the support of gangbar more smooth.

Preferably, the middle lower part of the rear end of the lumbar support body is fixedly connected with the rear part or integrally extended to form a support rod, and the upper end part of the linkage rod is hinged with the support rod respectively. In the technical scheme, the supporting rod is hinged with the linkage rod and transmits the stress of the waist rest body to the linkage rod.

Preferably, the tray is a tilting tray, and the lower end part 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 the technical scheme, the chair back supporting frame and the chair back and waist rest bodies connected with the chair back supporting frame can realize tilting and tilting swing based on the tilting tray; in the process of inclining, the linkage type supporting range of the waist support body is large, the waist support body is adaptive to fit the waist of a user, and the comfort is good.

In the specific scheme, the rear end of the tilting tray is linked with a telescopic adjusting assembly, the rear end of the telescopic adjusting assembly is connected with a mounting seat, the lower end part of a chair back supporting frame is locked and fixed through the mounting seat, and the lower end part of a linkage rod is hinged to the mounting seat. The telescopic adjusting assembly is used for sliding adjustment during installation, and is suitable for adjustment on different model differences or adjustment on process errors of the same product. The setting of mount pad has fixed back of the chair braced frame on the one hand, and on the other hand provides the basis for the articulated of gangbar.

Drawings

Fig. 1 is a front perspective view of a seat according to the present invention.

Fig. 2 is a perspective view of a back of a seat according to the present invention.

Fig. 3 is a side view of a seat according to the invention.

Fig. 4 is a schematic view showing the elastic support unit separated from the seat.

Fig. 5 is a structural view of the elastic support unit.

Fig. 6 is a schematic view of the mounting structure of the headrest.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 to 6, the present embodiment relates to a chair with a good fit of the lumbar portion, which includes a seat 1, a backrest 2 installed above the seat 1, and a lumbar support body 3 located between the backrest 2 and the rear end of the seat 1. The chair is characterized in that innovations are made in a waist rest structure, a chair back 2 structure and a mounting structure for adapting to the waist rest and the chair back 2, and the detailed contents are as follows:

as shown in fig. 2-4, a chair back support frame 5 is connected to the chair seat 1 or the tray 4, and the lower end of the chair back 2 is connected and fixed to the chair back support frame 5; the chair back support frame 5 is annular, the lumbar support body 3 is positioned in the frame of the chair back 2 support frame, and the upper end part of the lumbar support body 3 is hinged on the chair back support frame 5. A chair back supporting frame 5 is connected to the chair seat 1 or the tray 4 in the scheme, and the chair back supporting frame 5 is annular. The lower end of the chair back 2 is fixedly connected with the chair back support frame 5, the lumbar support body 3 is positioned in the frame of the chair back support frame 5, and the upper end part of the lumbar support body 3 is hinged on the chair back support frame 5. Thus, the backrest support frame 5 in this solution is a connecting support bracket for the backrest 2 and the lumbar support body 3, and a space provided for the movable arrangement of the lumbar support body 3 by the annular structure thereof.

As shown in fig. 1 to 4, the seatback 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 up and down. The elastic support unit 7 comprises a support main body made of elastic materials, the support main body is an arc-shaped body which protrudes backwards and has a forward opening, and a connecting part 73 used for being connected to the support upright 6 is arranged at the center of the rear end of the support main body. The chair back 2 is integrally constructed into a fishbone shape recorded in the background technology, adapts to the curve change of a human body, can independently support each part of the body, and provides corresponding supporting force according to the weight of each part of the body, so that the load of the back of the body is evenly distributed. On this basis, each elastic support unit 7 in the present embodiment is provided independently of each other, and the support body in each elastic support unit 7 is made of an elastic material. So, every elastic support unit 7's deformation space is great, hugs closely human back curvilinear basis on, can be based on the wiggling condition agilely self-adaptation laminating of person's back, and the travelling comfort is more. Based on the above characteristics, the seat back 2 has a reduced seating restriction on the occupant and an improved use experience.

In a further scheme, the elastic supporting unit 7 further comprises a flexible core layer (omitted in the figure) laid on the front end face of the supporting main body, and a surface layer (omitted in the figure) coated on the outer side of the flexible core layer. The edges of the facing are fixed to the support body. In the technical scheme, the flexible core layer is laid on the front end face of the elastic support main body, so that the comfort of the chair back 2 is further improved. The support body includes a base plate 71 and an inner liner plate 72 respectively made of an elastic material, and the inner liner plate 72 is covered on a front end face of the base plate 71 and is fixedly connected with 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 face 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. In this embodiment, the support body is divided into a base plate 71 and an inner lining plate 72, which are made of elastic material, respectively, and the inner lining plate 72 is connected and fixed to the base plate 71, and the edge of the facing layer is sandwiched between the base plate 71 and the inner lining plate 72, thereby playing a role of sandwiching and fixing the facing layer, and the facing layer can coat the flexible core layer on the front end face of the inner lining plate 72. Compared with the traditional scheme in which the edge of the surface layer is fixed in a gun nail mode, the scheme considers that the supporting main body is made of flexible materials and is difficult to fix the gun nail. Another aspect is that the solution enables easy disassembly of the facing and flexible core layers.

Preferably, the connecting portion 73 is an elastic connecting portion integrally constructed with the base plate 71. Here, the coupling portion 73 is integrally formed with the base plate 71 to constitute an elastic coupling portion. On one hand, the forming is more convenient, on the other hand, the elastic connecting part 73 can generate a certain deformation amount relative to the supporting upright 6, and the elastic connecting part 73 is close to the axial point of the whole elastic supporting unit 7, so that the deformation amount can improve the twisting range of the whole elastic supporting unit 7, and the adjusting space of the elastic supporting unit is larger. In a specific embodiment, the connecting portion 73 is a collar, a shaft hole is formed inside the collar, and a connecting hole communicated with the inside of the shaft hole of the collar is formed at the center of the front end of the base plate 71. The lantern ring of elastic support unit 7 wears to establish on support post 6, is equipped with the screw hole on the support post 6, and the solid part of spiral shell passes the connecting hole and connects on the screw hole, can connect elastic support unit 7 and fix on support post 6. During installation, the connecting part 73 of the elastic supporting unit 7 is sleeved from the upper end of the supporting upright post 6, and after moving to a proper position, the connecting part is connected in a threaded hole of the supporting upright post 6 through a connecting hole through a bolt to be fixed, so that the height is axially positioned. In this scheme, adopt the mode of cup jointing installation elastic support unit 7, the installation is convenient, and installation back stable in structure. Further, by providing the connection hole at the front end of the base plate 71, the connection hole can be hidden after the mounting is completed.

As shown in fig. 4 and 6, the headrest mounting seat 8 is sleeved on the top of the support upright 6 in a longitudinally sliding manner, and a headrest 81 is hinged to the headrest mounting seat 8 and can rotate up and down relative to the headrest mounting seat 8 along the hinged end of the headrest 81. The headrest 81 comprises an elastic supporting unit 7, the elastic supporting unit 7 comprises a supporting main body made of elastic materials, the supporting main body is an arc-shaped body protruding backwards and provided with a forward opening, and a connecting portion 73 used for being connected to the headrest mounting seat 8 is arranged at the center of the rear end of the supporting main body. In a further scheme, the headrest mounting base 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 formed in the center of the rotating shaft. The screw-fastening part passes through the shaft hole and is connected to the hinge groove 82. At least one of the side walls of the hinge groove 82 and the two axial side walls of the rotating shaft is provided with positioning teeth which are matched in the circumferential direction. In the above-described aspect, a headrest 81 is also formed above the seatback 2, and the headrest 81 is also constructed by the above-described single elastic support unit 7. The flexible support effect is achieved. Further, the headrest 81 is rotatably provided on the headrest mounting seat 8, 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 relative to the headrest mounting seat 8, and the angular positioning is realized by the positioning teeth.

As shown in fig. 2 and 3, the back 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. The articulated shafts at the upper end and the lower end of the linkage rod 9 are respectively provided with a torsional spring, and the linkage rod 9 provides forward elastic supporting force for the waist rest body 3. The top of the waist support body 3 in the scheme is rotatably connected below the chair back 2, the lower end part is elastically supported, and the waist support can be automatically adjusted along the hinged end according to the sitting posture of a user during use, so that the self-adaptive fitting human waist curve is realized. On this basis, the back end of the waist rest body 3 in the scheme is connected with the seat 1 or the tray 4 through the linkage rod 9, the upper end and the lower end of the linkage rod 9 are hinged, and the hinged end is provided with a torsion spring for providing elastic supporting force. Based on the structure, the waist rest body 3 adopts linkage type support, the movable range of the waist rest body 3 is larger, and the waist rest is suitable for fitting the waist of a human body under the condition of more sitting postures, such as adjusting the inclination angle of the chair back 2. And the linkage type support can disperse the stress. In the adjusting process, the supporting force applied to the waist is evenly distributed, so that the comfort can be felt by the body. No obvious oppressive feeling exists.

In a further scheme, an arc-shaped supporting surface which protrudes forwards and has a backward opening is constructed at the front end of the lumbar support body 3. Among this technical scheme, arc elastic support face can be based on the curved self-adaptation laminating of waist that relies on the one hand, and on the other hand combines above-mentioned coordinated type bearing structure, and human waist can provide a slant decurrent power to arc elastic support face when taking, and this effort direction is syntropy with the rotation direction of lumbar support body 3 to make lumbar support body 3 rotate along its hinged end and the support of gangbar 9 more smooth. In addition, the middle lower part of the rear end of the lumbar support body 3 is fixedly connected with the rear part or integrally extended to form a support rod 31, and the upper end part of the linkage rod 9 is hinged with the support rod 31; the support rod 31 is hinged with the linkage rod 9 and transmits the stress of the lumbar support body 3 to the linkage rod 9.

Finally, the tray 4 is a tilting tray, and the lower end part 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 the technical scheme, the chair back support frame 5 and the chair back 2 and the lumbar support body 3 connected with the chair back support frame can realize tilting swing based on the tilting tray. In the process of inclining, the linkage type supporting range of the waist support body 3 is large, the waist support body 3 is adaptive to fit the waist of a user, and the comfort is good. In the specific scheme, the rear end of the tilting tray is linked with a telescopic adjusting component 42, the rear end of the telescopic adjusting component 42 is connected with a mounting seat 43, the lower end part of the chair back supporting frame 5 is locked and fixed through the mounting seat 43, and the lower end part of the linkage rod 9 is hinged on the mounting seat 43. The telescopic adjusting assembly 42 is used for sliding adjustment during installation, and is suitable for adjustment of different models or adjustment of process errors of the same product. The arrangement of the mounting seat 43 fixes the chair back supporting frame 5 on one hand and provides a foundation for the hinging of the linkage rod 9 on the other hand.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.

Claims

1. A chair with good waist and back fitting degree comprises a chair seat (1), a chair back (2) arranged above the chair seat (1), and a waist rest body (3) positioned between the chair back (2) and the rear end part of the chair seat (1); the method is characterized in that: the chair back support frame (5) is connected to the chair seat (1) or the tray (4), and the lower end of the chair back (2) is fixedly connected to the chair back support frame (5); the chair back (2) comprises a support upright post (6) at the center and a plurality of elastic support units (7) which are connected to the support upright post (6) and are arranged side by side up and down; the elastic supporting unit (7) comprises a supporting main body made of elastic materials, the supporting main body is an arc-shaped body which protrudes backwards and has a forward opening, and a connecting part (73) used for being connected to the supporting upright post (6) is arranged at the center of the rear end of the supporting main body;

the chair back supporting frame (5) is annular, the lumbar support body (3) is positioned in the frame of the chair back supporting frame (5), the upper end part of the lumbar support body (3) is hinged to the chair back supporting frame (5), the rear end part of the lumbar support body (3) is connected to the chair seat (1) or the tray (4) through a linkage rod (9), the upper end part of the linkage rod (9) is hinged to the lumbar support body (3) respectively, and the lower end part of the linkage rod (9) is hinged to the chair seat (1) or the tray (4); the articulated shafts at the upper end and the lower end of the linkage rod (9) are respectively provided with a torsional spring, and the linkage rod (9) provides forward elastic supporting force for the waist rest body (3).

2. The chair with good waist and back fit as claimed in claim 1, wherein: the elastic supporting unit (7) further comprises a flexible core layer laid on the front end face of the supporting main body and a surface layer coated on the outer side of the flexible core layer; the edges of the facing are fixed to the support body.

3. The chair with good waist and back fit as claimed in claim 2, wherein: the support main body comprises a base plate (71) and an inner lining plate (72) which are respectively made of elastic materials, and the inner lining plate (72) covers the front end face of the base plate (71) and is fixedly connected with the base plate (71); the connecting part (73) is connected with the base plate (71); the flexible core layer is laid on the front end face of the lining plate (72), and the edge of the surface layer is clamped between the base plate (71) and the lining plate (72).

4. The chair with good waist and back fit as claimed in claim 1, wherein: the connecting portion (73) is an elastic connecting portion (73) integrally constructed with the base plate (71); the connecting part (73) is a lantern ring, a shaft hole is formed in the lantern ring, and a connecting hole communicated with the inside of the shaft hole of the lantern ring is formed in the center of the front end of the base plate (71); the lantern ring of elastic support unit (7) is worn to establish on support post (6), is equipped with the screw hole on support post (6), and the solid part of spiral shell passes the connecting hole and connects on the screw hole, can fix elastic support unit (7) connection on support post (6).

5. The chair with good waist and back fit as claimed in claim 1, wherein: the headrest mounting seats (43) and (8) are longitudinally sleeved on the tops of the supporting upright columns (6) in a sliding manner, headrests (81) are hinged to the headrest mounting seats (43) and (8), and the headrests (81) can vertically rotate relative to the headrest mounting seats (43) and (8) along the hinged ends of the headrests; headrest (81) include elastic support unit (7), and elastic support unit (7) include the support main part that elastic material made, and support main part is the arc body that backward protrusion and opening forward, and the rear end center department of supporting the main part is provided with connecting portion (73) that are used for connecting in headrest mount pad (43) (8).

6. The chair with the good waist and back fit function as claimed in claim 5, wherein: the headrest mounting seats (43) and (8) are provided with hinge grooves (82), the connecting part (73) of the headrest (81) is a rotating shaft, and the center of the rotating shaft is provided with a shaft hole; the screw fixing part passes through the shaft hole and is connected to the hinge groove (82); at least one side wall of the hinge groove (82) and the axial two side walls of the rotating shaft is provided with positioning teeth which are matched in the circumferential direction.

7. The chair with good waist and back fit as claimed in claim 1, wherein: the front end of the waist rest body (3) is provided with an arc-shaped supporting surface which protrudes forwards and has a backward opening.

8. The chair with good waist and back fit as claimed in claim 7, wherein: the middle lower part of the rear end of the waist support body (3) is fixedly connected with the rear part or integrally extends to form a support rod (31), and the upper end part of the linkage rod (9) is hinged with the support rod (31).

9. The chair with good waist and back fit as claimed in claim 7, wherein: the tray (4) is a tilting tray, and the lower end part 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).

10. The chair with good waist and back fit as claimed in claim 9, wherein: the rear end of the tilting tray is linked with a telescopic adjusting component (42), the rear end of the telescopic adjusting component (42) is connected with a mounting seat (43), the lower end part of the chair back supporting frame (5) is locked and fixed through the mounting seat (43), and the lower end part of the linkage rod (9) is hinged on the mounting seat (43).