KR102023461B1 - chair - Google Patents

Abstract

The present invention relates to a chair used in an office or a home and a school. More specifically, a plurality of horizontal supports are integrally formed on an inner side of a backrest unit. Curved elastic units of different thicknesses between the supports are formed on vertical curved beams corresponding to the gaps between the horizontal supports, and a composite elastic body with improved strength and elastic modulus is insert-formed on the curved elastic units. The entire backrest unit reacts to pressure by the weight of a user and a back leaning action to be curved along the spine shape of the user and to be tightly attached to the entire portions of the lumbar, thoracic vertebrae, and cervical vertebrae of the user. Therefore, the weight is evenly supported on the entire backrest and thus an excessive load is not concentrated on the spine to expect a beneficial role on spine health. Since the backrest unit is bent to match the spine shape of the user, a comfortable state can be maintained without a burden on the spine even if the user rests or sleeps for a long period of time.

Description

Chair with backrest bent to spine shape {chair}

The present invention relates to a chair used in an office, home, and school, and more particularly, the back of the user's spine in accordance with the load acting on the back of the chair to bend the deformation of the user's lumbar region, thoracic and cervical spine It is about a chair that allows the backrest to maintain the "S" shape naturally along the shape of the spine of the user while allowing the load to be distributed evenly.

In general, the chair is provided on a seat plate portion for supporting the user's buttocks, a backrest portion positioned vertically to the seat plate portion and supporting the back of the user fixed to the back of the seat plate portion, and provided on the backrest portion or a separate support stand. Lumbar support for supporting the lumbar spine, which is part of the back.

In addition, a tilting apparatus may be further provided at the bottom of the seat plate portion to pivot the back portion forward and backward of the chair in order to comfortably support the user's back. When the tilting apparatus is further provided, the tilting apparatus may be further provided. The bottom is coupled to the tilting device. Therefore, the upper part of the back part rotates in the forward / backward direction with the lower part as the center, so that when the user stretches back or leans back to rest, the back part rotates before and after accordingly to support the user's weight stably. can do.

Such a conventional chair has a left and right spine back portion of a bending structure and a vertical support for supporting the left and right spine back portion, as shown in Korean Utility Model Registration No. 20-0230508, to support a curved state in which the thoracic and lumbar spines are bent. And, while forming a horizontal support in the center of the vertical support, the cervical spine supporting the cervical spine mounted on the top of the horizontal support, and by mounting the vertical support to the lower end of the seat seat, spinal cervical spine which is a pillar of the human body By supporting the curvature of the spine, thoracic and lumbar spine, the effect of improving spinal health as well as creating a spinal curve that maintains normal curvature of the spine that does not maintain natural curvature due to the displacement of the spine, A chair has been registered that has an excellent effect on maintaining a healthy spine.

In addition, as shown in Korean Patent No. 10-1044430, the one-back type back plate supporting the left and right of the user's back at once, the back plate support for supporting the back portion, and is provided between the upper portion and the back support portion of the back portion; It is provided between the fixing unit for fixing the upper part of the back part to the back part support, and the lower part of the back part and the back part support part. When an external force is applied to the back part, elastic force is applied so that the lower part of the back part can move left and right relative to the back part support part. A lumbar support provided in the elastic unit to provide the back support and supporting the lumbar spine by pressing the back; And the back support device of the chair including a front and rear movement unit for moving the lumbar support before and after has been registered.

Subsequently, as shown in Patent No. 10-1607220 by the applicant of the present invention, the support bar is made of a plurality of support bars so as to be easily deformed according to the shape of the back part of the user. By providing the structure of the fixing bar of the backrest that can be combined by the plate spring form of the blue plate, the backrest is composed of a plurality of support bars, which is easily deformed according to the shape of the back part of the user, thereby reducing the accumulation of fatigue in the waist and back Joint chairs have been registered that are effective in preventing pain and disease.

However, in the case of the conventional backrest chair, when the user's weight is intact on the backrest, such as the user resting or stretching, the backrest simply has a form in which the backrest is simply rotated to the rear or the lower back of the backrest of the user. Only by varying the amount of rotation to work in a form that gives comfort, which has a problem that does not correspond properly with the shape of the human spine.

In other words, the spine of the human body is largely divided into lumbar, thoracic and cervical spine. They generally have the shape of 'S', and when the back is tilted backwards, the most movement occurs in the lumbar region while the thoracic spine is generated. Since the user's weight is transmitted to the backrest in the most part, when bending or change occurs only in the lower part of the backrest, the user does not effectively support the weight in the thoracic or cervical spine, so users feel uncomfortable when using it for a long time. Will be.

In addition, if you maintain your back for a long time, such as taking a long rest or sleeping with your back tilted, strong pressure on the thoracic spine due to your weight will be maintained, but support will not be made at all on the cervical spine. Not only does it benefit spine health, but it also has a feeling of being unable to rest and relax.

Republic of Korea Utility Model Registration 20-0230508 (registered May 02, 2001) Republic of Korea Patent Registration 10-1044430 (Registered June 20, 2011) Republic of Korea Patent Registration 10-1607220 (registered on March 23, 2016)

The present invention is to solve the problems as described above, but formed by integrally forming a plurality of horizontal support on the inside of the back support, the vertical bend between the horizontal support has a different thickness between each support between each support By forming a flexible elastic portion and insert molding a composite elastic body having increased strength and elastic modulus at these flexible elastic portions,

If the user's weight acts on the backrest, the flexion of the backrest occurs with different flexural modulus in response to the lumbar region, thoracic and cervical spine of the user so that the weight is distributed evenly over the user's back. It is an object of the present invention to provide a chair having a backrest to obtain a state as well as a more comfortable and natural rest due to a naturally curved backrest along the shape of the human spine.

The present invention for achieving the above object is composed of a seating portion, a support portion coupled to the lower portion of the seating portion, a support frame extending upwardly from the rear side of the seating portion, and the backrest is mounted on the front of the support frame, In the upper and lower ends of the support frame is provided with support arms extending to both sides protruding from the upper and lower ends of the backrest portion is configured to be fixed to the support arm,

The backrest part is configured as a vertical bend to form the upper support and the lower support and the first to sixth horizontal support and the ends of each support integrally arranged downwardly therebetween integrally connected to each other, the longitudinal bend between each support The first to seventh flexible elastic parts having a reduced width and thickness are sequentially formed in descending order compared to the width and thickness of the longitudinal bend, and the first and seventh flexible elastic parts have a width and thickness corresponding to the reduced width and thickness. The first to seventh composite elastic bodies are formed by insert molding the first to seventh flexible elastic sections, respectively.

The present invention, even in response to the pressure according to the weight of the user and the action of tilting back, the entire back portion is bent according to the shape of the user's spine and close to the user's lumbar spine and thoracic and cervical spine, so as to support the weight evenly throughout the back It is possible to expect a beneficial role in the health of the spine because the excessive load on the spine is not concentrated, and the back part is bent as it is in the form of the user's spine, so even when taking a long rest or sleeping, the spine is more comfortable and comfortable at all. The effect is to maintain.

1 is an overall perspective view of a chair to which the backrest is applied according to the present invention
2 is an overall perspective view of the backrest according to the invention
3 is a perspective view of a state in which the elastic body of the backrest according to the present invention is removed
4 is a front view of a state in which the elastic body of the backrest according to the present invention is removed;
Figure 5 is a side cross-sectional detail view of the backrest according to the invention
Figure 6 is a side overall view of a chair to which the backrest according to the present invention is applied
Figure 7 is an operating state of the load acting on the chair with the backrest according to the present invention
8 is another operating state in which the load is applied to the chair to which the backrest is applied according to the present invention

Further objects, features and advantages of the present invention can be more clearly understood from the following detailed description and the accompanying drawings.

Prior to the detailed description of the present invention, the present invention may be variously modified and may have various embodiments, and the examples described below and illustrated in the drawings are intended to limit the present invention to specific embodiments. It is to be understood that the present invention includes all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Also, when a component is said to be "connected" or "connected" to another component, it may be directly connected or connected to that other component, but other components may be present in the middle. It should be understood that. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Then, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

In addition, the terms "... unit", "... unit", "... module", and the like described in the specification mean a unit for processing at least one function or operation, which means hardware or software or hardware and It can be implemented in a combination of software.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same reference numerals and duplicate description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall perspective view of a chair to which the backrest is applied according to the present invention, FIG. 2 is an overall perspective view of the backrest according to the present invention, FIG. 3 is a perspective view of a state in which the elastic body of the backrest according to the present invention is removed, and FIG. Front view of the state in which the elastic body of the backrest according to the invention is removed, Figure 5 is a side cross-sectional detail of the backrest according to the invention, Figure 6 is a side view of the chair is applied to the backrest according to the invention.

As shown in the chair according to the present invention, the seating part 100 provided to allow the user to sit on the upper side of the support 200 on which the caster is mounted on the bottom is coupled, and protrudes upward toward the rear side of the seating part 100. The support frame 300 is coupled to form a form, the front of the support frame 300 is coupled to the backrest portion 400 is located in the upper rear side of the seating portion 100.

At this time, in the present invention, the support arms 301 and 301 'protruding in the transverse direction, respectively, on the upper and lower ends of the support frame 300 to form the backrests at each end of the support arms 301 and 301'. As the upper and lower ends of the part 400 are combined to form the weight of the user acting on the backrest part 400 while being fully supported by the backrest part 400, the body weight and the weight acting on the backrest part 400 and The load may be buffered and supported by the support frame 300 again.

The chair of the present invention is such that the backrest is curved according to the load of the backrest acting by the shape of the user's spine while at the same time distributing and supporting the user's weight and load more efficiently through structural improvements to the backrest part 400. As it is configured to be deformed in the shape of the jeans, the load applied to the backrest is more evenly supported, and the backrest is deformed according to the shape of the spine of the user to obtain a more comfortable and comfortable feeling.

Accordingly, in the present invention, the upper and lower support 401 and the lower support 402 for coupling and fixing the back support part 400 to the support arms 301 and 301 'of the support frame 300, which are provided in the upper and lower sides. To form a spaced apart, both ends of the upper support 401 and the lower support 402 is connected by the vertical bend 404, 404 'to have a frame structure of a rectangular frame, the upper support 401 Between the lower support 402 is to form a plurality of horizontal support.

At this time, the horizontal support is composed of six objects in the form of mutual separation between the upper support 401 and the lower support 402, both ends of these first to sixth horizontal support (403a ~ (403f) is It has a form that is integrally connected to the longitudinal bend 404, 404 '.

In addition, the longitudinal bend 404, 404 'corresponding to the end of each support in the longitudinal bend 404, 404' is to form a flexible elastic portion to reduce the width and thickness of the portion, A first bend elastic portion 405a is formed on the vertical flexures 404 and 404 'corresponding to the ends of the upper support 401 and the first horizontal support 403a, and the first horizontal support 403a. And a second bend elastic portion 405b formed on the vertical flexures 404 and 404 'corresponding to the ends of the second horizontal supporters 403b, and the sixth horizontal supporters 403f and the lower supporters 402. The first bends 404 and 404 'on both sides of the first bends 404 and 404' are formed between the respective connecting portions of the support parts. The seventh to seventh elastic portions 405a to 405g are sequentially formed downward.

Thus, the present invention through the bent elastic portion 405a ~ 405g formed between the upper support 401 and the lower support 402 and six horizontal support 403a ~ (403f) located between them. The back portion 400 is made of a bending deformation of the shape appropriate to the shape of the user's spine.

In addition, the first to seventh flexible elastic parts 405a to 405g have a reduced width and thickness in the longitudinal bends 404 and 404 'to increase the flexural modulus of the corresponding parts and to increase the compressive strength and the elastic restoring force. Insert-molded composite elastomer of the form corresponding to

The first to seventh composite elastic bodies 406a to 406g respectively formed to correspond to the first to seventh bend elastic portions 405a to 405g formed on both longitudinal bending zones 404 and 404 '. Insert injection molding enhances the sense of unity with the longitudinal bends 404 and 404 ', and at the same time, the organic deformation bending action of the backrest part 400 by the first to seventh flexible elastic parts 405a to 405g. It will help you run smoothly.

Here, the composite elastic body is an elastic resin made by mixing the elastomer and PE, also called TPR (Thermo Plastic Rubber) and can obtain a higher strength, hardness and elastic modulus according to the mixing ratio of the material, in the present invention The mutual flexural modulus between the longitudinal bending zones 404, 404 'and the composite elastic body is adjusted to have a ratio of 100: 225 in samples of the same size, respectively, so that the strength and elastic modulus of the composite elastic body are further improved compared to the longitudinal bending band. will be.

Accordingly, the first to seventh flexible elastic parts 405a to 405g have a loss in cross section due to a decrease in width and thickness, so that the strength and elastic modulus will be reduced, but the first to seventh excellent flexural modulus are more excellent. Since the seventh composite elastic bodies 406a to 406g are compensated by the insert molding for the cross-sectional loss, the first to seventh flexible elastic parts 405a to 405g are reduced in strength and elastic modulus due to the cross-sectional loss. Even more improved strength and modulus of elasticity will be.

At this time, the reduction amount with respect to the width of the first to seventh flexible elastic portion (405a) to (405g) should be limited to the reduction within 5% of the original width of the longitudinal bending zone 404,404 ', If the width is excessively reduced, not only the breakage of the first to seventh flexible elastic parts 405a to 405g may occur, but also the rise of the insert molding of the first to seventh composite elastomers 406a to 406g. Since there is a problem in that the management of the numerical values for the strength and elastic modulus to be complicated, such a reduction in the width is such that the first to seventh composite elastic bodies 406a to 406g can be formed into a rectangular tube. It is ideal to have a minimum thickness ratio.

Therefore, the present invention does not take into account changes in flexural modulus, etc., with respect to the above-mentioned decrease in area, and simply decreases flexural modulus due to thickness reduction of the first to seventh flexural portions 405a to 405g. Only the increased flexural modulus due to the composite elastic body of the corresponding part will be compared and explained.

First, the first bend among the first to seventh bend elastic portions 405a to 405g between the supports that are sequentially formed on both side longitudinal bends 404 and 404 'of the backrest 400 of the present invention. The elastic portion 405a is positioned at the cervical spine of the user, and the second flexible elastic portion 405b and the third flexible elastic portion 405c are configured to be positioned at the thoracic spine of the user, and the fourth flexible elastic portion 405d. ) Is positioned between the user's thoracic and lumbar spine, and the fifth and sixth flexible elastic parts 405e and 405f are configured to be positioned at the lumbar part of the user, and the seventh flexible elastic part 405g is the tail bone of the user. It is arranged to be located in the part.

In addition, the first to third horizontal support members 403a to 403c forming the second and third flexible elastic parts 405a and 405b are configured to be located at the thoracic spine of the user, and the fifth and sixth elastic flexors The fourth to sixth horizontal supporters 403a to 403c forming the parts 405e and 405f are configured to be located at the lumbar region of the user,

The fifth and sixth flex elastic portions 405e and 405f of the lumbar region are configured to have the highest flexural modulus among all the flexural elastic portions, and the second and third flexural elastic portions 405a and 405b of the thoracic region are It is configured to have the lowest flexural modulus among the entire flexural modulus.

To this end, the fifth and sixth flexible elastic parts 405e and 405f are formed to be the thinnest among all the flexible elastic parts to form a thicker elastic modulus having a higher thickness, thereby increasing the flexural modulus. In the case of the three flexural elastic parts 405a and 405b, the flexural modulus is also relatively thin as the thickness of the composite elastic body is formed by forming a relatively thicker thickness than the fifth and sixth flexible elastic parts 405e and 405f. It was designed to be low, and it was designed so that the flexural modulus in each flexural elastic part may differ with a position.

This is because the fifth and sixth bending elastic parts 405e and 405f receiving the greatest load of the user have the largest bending modulus, thereby providing excellent elasticity to the backrest part 400 in the back state while being efficient. The second and third flexural elastic parts 405a and 405b are designed to produce a restoring force so that a user does not excessively deform in the process of forcing the back back by using a weight. 3 If the flexural modulus of the flexible elastic portion 405a (405b) is high, the thoracic spine of the user will be excessively retracted, and if the flexural modulus is low, the bending at the thoracic spine does not occur, so as to form the spine. No deformation of the backrest occurs.

In addition, in the case of the first bending elastic part 405a, the fourth bending elastic part 405d, and the seventh bending elastic part 405g, the second and third bending elastic parts 405a and 405b and the fifth and sixth bending parts It has a flexural modulus corresponding to approximately an intermediate value of the flexural modulus in the elastic parts 405e and 405f. The first flexural elastic part 405a, the fourth flexural elastic part 405d, and the seventh flexural elastic part ( 405g) is according to the curvature of the second and third bend elastic portions 405a and 405b and the fifth and sixth bend elastic portions 405e and 405f according to the load and load of the user acting on the entire backrest 400. While naturally elastically bent together, the entire backrest 400 serves as an intermediate linking bending object to have a shape that most closely conforms to the shape of the user's spine.

Therefore, as shown in FIGS. 7 and 8, the upper support part 401 and the lower support part 402 are fixed and restrained to the support arms 301 and 301 ′ of the support frame 300. When the user's load is applied to the entirety, the fifth and sixth bending elastic parts 405e and 405f corresponding to the lumbar part of the user are first bent toward the lumbar part of the user in a '(' shape). If the load is continuously applied, the second and third bend elastic portions 405a and 405b are bent while forming a ')' shape due to the pressure on the thoracic spine of the user.

This is because the upper support 401 is restrained by the support arms 301 and 301 ', so that the load is applied to the second and third bent elastic portions 405a and 405b without the upper support 401 being retracted. As a result, the second and third curved elastic parts 405a and 405b may eventually form a 'S' shape at the top and a '(' shape) at the bottom of the body. '(Strictly expressed, the reverse form of the S letter) will be produced,

Here, the longitudinal bending zone and the composite elastic body are configured to have a flexural modulus of 100: 225 with each other, and thus, the first to seventh flexible elastic parts 405a to 405g are more increased than the original elastic modulus due to the synthetic resin. It has a flexural modulus, and in the case of synthetic resins, the hardness is excellent but the elasticity and the recovery rate are inferior. To compensate for this, each of the first to seventh flexible elastic parts 405a to 405g is formed by double injection. The first to seventh composite elastic bodies 406a and 406g are insert molded.

In addition, by varying the amount of thickness reduction for each of the first to seventh flexible elastic parts 405a to 405g, the elastic modulus due to the reduced thickness is compensated through the composite elastic body and simultaneously molded in the reduced thickness part. Due to the composite elastic body that is rather configured to increase the refractive modulus of the portion further to support the weight and load of the user smoothly and at the same time in response to the load according to the shape of the spine deformation of the back portion 400 like the spine shape of the human body This is what happened.

Accordingly, the thickness of the first flexible elastic portion 405a is 60% of the original thickness of the vertical flexural bands 404 and 404 'so that the first flexible elastic portion 405a and the first composite elastic body ( The combined flexural modulus of 406a is increased by 150% compared to the original first flexural modulus 405a in the unreduced state.

That is, since the elastic force of the composite elastic body having a corresponding size is set to 225 in the state in which the elastic elasticity of the flexural elastic portion originally made of synthetic resin is set to 100, the first flexible elastic portion 405a has an elastic force of 60 due to the 40% cross-sectional reduction. In the insert molding of the first composite elastomer 406a to 40%, the elastic force of the first composite elastomer 406a of the compensation size is 90. Therefore, the elastic force of 60 by the synthetic resin and the elastic force of 90 by the composite elastic body is added together to have the elastic force of 150.

In addition, the second and third bend elastic portions 405b and 405c have a thickness of 70% of the original thickness of the vertical bends 404 and 404 ', so that the second and third bend elastic portions 405b and 405c are formed. ) And the second and third composite elastic bodies 406b and 406c have a flexural modulus increased to 138% compared to the original second and third flexible elastic portions 405b and 405c without being reduced.

The fourth flexible elastic portion 405d has a thickness of 60% of the original thickness of the vertical flexural bands 404 and 404 ', so that the fourth flexible elastic portion 405d and the fourth composite elastic body 406d may have a thickness. Compared to the original fourth flexible elastic portion 405d in which the combined flexural modulus is not reduced, the flexural modulus increased by 150%.

Subsequently, the fifth and sixth flexible elastic parts 405e and 405f have a thickness of 33.3% of the original thickness of the longitudinal bending bands 404 and 404 '. ) And the fifth and sixth composite elastic bodies 406e and 406f have a flexural modulus increased to 183% compared to the original fifth and sixth flexible elastic portions 405e and 405f without being reduced.

The thickness of the seventh bend elastic portion 405g is 60% of the original thickness of the longitudinal bends 404 and 404 'so that the seventh bend elastic portion 405g and the seventh composite elastic material 406g are formed. The combination flexural modulus is configured to have a flexural modulus increased by 150% compared to the original seventh flexural modulus 405g in a state in which the combined flexural modulus is not reduced.

Thus, the backrest part 400 maintains a smooth curvature in a normal state, and when the user lifts the backrest to act on the user's weight, the fifth and sixth bends in which the composite elastic body having the thickest thickness under which the entire load is applied are molded. As the bending portion starts to be bent at the highest flexural modulus in the elastic portions 405e and 405f, the entire backrest portion 400 is flipped,

Due to the load acting on the entire backrest part 400, the first bend elastic part 405a, the fourth bend elastic part 405d, and the seventh bend elastic part 405g, which are composed of a composite elastic body having the same cross section and the same thickness, are gradually Organic bending is to be done,

If the load is continuously transmitted to the back of the user, the bending of the second and third bending elastic parts 405a and 405b occurs, thereby creating an inverted 'S' shape like the spine of the human body. .

In this case, when the flexural modulus of the second and third bent elastic parts 405a and 405b is excessive, excessive bending may occur in the thoracic spine due to an excessive bending phenomenon in the case of a user with a large load such as a man. In this case, if the user has a small weight, such as a woman, the bending phenomenon does not occur in the corresponding part, so that the user feels the pressure in the thoracic spine, so that the mutually appropriate flexural modulus should be designed. The elastic modulus fit design ensures that all users can bend regardless of their weight or working load.

In addition, in the case of the seventh flexible elastic portion 405g, if the cross-sectional thickness of the synthetic resin is further reduced and the composite elastic body is molded by the reduced cross-section, a higher flexural modulus can be obtained to further improve the elasticity of the entire backrest part 400. The seventh flexible elastic portion 405g may be a portion in which the weight and load of the user are most concentrated, and thus, when excessive cross-sectional loss is applied, a cutting phenomenon occurs in the corresponding portion. In the case of), an appropriate bracing action for weight and load is performed.

Accordingly, the chair of the present invention supports the weight and load evenly in the entire backrest 400 while the backrest 400 is bent in the form of the spine of the human body in response to the weight and the load as the user's weight and the load act. Of course, as the back portion 400 is deformed and bent in the form of the spine of the human body, it is possible to feel more comfortable and comfortable to use.

The embodiments described in the present specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, and various equivalents and modifications that may be substituted for them are provided. It should be understood that there may be examples.

100: sitting part
200: support
300: support frame 301,301 ': support arm
400: back portion 401: upper support
402: lower support 403: horizontal support
404,404 ': vertical bending zone 405: flexural elastic part
406: composite elastomer

Claims (3)

The seating part 100, the support part 200 coupled to the lower part of the seating part 100, the support frame 300 extending upward from the rear side of the seating part 100, and the front of the support frame 300. Consists of the backrest portion 400 to be mounted, the upper and lower ends of the support frame 300 is provided with support arms 301 and 301 'protruding from both sides to support the upper and lower ends of the backrest portion 400. The support arms 301 and 301 ′ are fixed to the support arm 301, and the backrest part 400 has the upper support 401 and the lower support 402 and the first to sixth horizontal supporters arranged downward repeatedly therebetween ( 403a) to (403f) and vertical bends 404 and 404 'which integrally form both ends of each support, and the vertical bends 404 and 404' between the respective supports are vertically bent. The first to seventh flexible elastic parts 405a to 405g each having a reduced width and thickness compared to the width and thickness of the stand are sequentially formed in the downward direction. In the seventh flexible elastic portion 405a (405g), the first to seventh composite elastic bodies 406a and 406g each having a width and thickness corresponding to the reduced width and thickness are first to seventh flexible elastic portions 405a. The first to third horizontal supporters 403a to 403c forming the second and third bent elastic portions 405a and 405b, respectively, are formed at the user's thoracic region. The fourth to sixth horizontal support members 403a to 403c forming the fifth and sixth flexible elastic parts 405e and 405f are configured to be positioned at the lumbar region of the user.
The fifth and sixth flex elastic portions 405e and 405f of the lumbar region are configured to have the highest flexural modulus among all the flexural elastic portions, and the second and third flexural elastic portions 405a and 405b of the thoracic region are Configured to have the lowest flexural modulus among all the flexural modulus
When the weight is applied to the entire flex elastic portion, the second and third flex elastic portions 405a and 405b are formed so that the '(' shape bend is formed toward the lumbar region of the user while the entire back portion 400 acts. The fifth and sixth flexible elastic parts 405e and 405f are curved in a ')' shape toward the thoracic spine by the user's weight pressure while the retraction of the upper support 401 is suppressed by the support frame 300. In the chair having a backrest that is bent into a spine shape configured to be formed,
The longitudinal bending zone and the composite elastic body are configured to have a flexural modulus of 100: 225, and the thickness of the first bending elastic part 405a is 60% of the original thickness of the longitudinal bending bands 404 and 404 '. The first flexural modulus 405a and the first composite elastic modulus 406a are combined to have a flexural modulus increased to 150% compared to the original first flexural modulus 405a without being reduced. The second and third bend elastic portions 405b and 405c have a thickness of 70% of the original thickness of the vertical bend 404 and 404 ', so that the second and third bend elastic portions 405b and 405c are formed. And the combined flexural modulus of the second and third composite elastic bodies 406b and 406c to have a flexural modulus increased to 138% compared to the original second and third flexible elastic parts 405b and 405c without being reduced. The flexural elastic portion 405d has a thickness of 60% of the original thickness of the longitudinal bending zones 404 and 404 'so that the combination of the fourth flexible elastic portion 405d and the fourth composite elastic body 406d is achieved. The total flexural modulus has a flexural modulus that is increased to 150% compared to the original fourth flexural modulus 405d in the unreduced state, and the thicknesses of the fifth and sixth flexural modulus 405e and 405f are vertical flexural bands ( The combination flexural modulus of the fifth and sixth flexible elastic parts 405e and 405f and the fifth and sixth composite elastomers 406e and 406f is not reduced by constructing a thickness of 33.3% of the original thickness of 404 and 404 '. Compared to the original fifth and sixth flexible elastic parts 405e and 405f, the flexural modulus is increased to 183%, and the thickness of the seventh flexible elastic part 405g is the length of the longitudinal bending bands 404 and 404 '. Composed of a thickness of 60% of the original thickness, the combined flexural modulus of the seventh flexible elastic part 405g and the seventh composite elastic body 406g is 150% compared to the original seventh flexible elastic part 405g without being reduced. A chair having a backrest that is bent into a spine shape, characterized in that it is configured to have an increased flexural modulus. delete delete

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