KR102506194B1 - Backrest body for chair with lumbar support of three-dimensional elastic structure - Google Patents

Abstract

The present invention relates to a backrest for a chair, and more particularly, to a lumbar support in which a curved horizontal support is integrally formed with a backrest frame, and a curved support fastening portion and a pair of elastic support portions are integrally formed with each other on the horizontal support. The coupling is formed, but the curved support fastening part and the elastic supporting part are configured to be integrally connected and formed by an elastic connecting part having a different shape of the upper curvature line and the lower curvature line,
In the process of the user's weight acting on the backrest and lumbar support, the lumbar support is elastically deformed in three dimensions according to the angle of the user's lumbar spine or the magnitude and direction of the load, supporting the user's lumbar spine in the best form, providing more comfort and comfort. In addition to being able to use the chair with a backrest, the lumbar support is elastically supported on the user's lumbar spine and side, so there is no unnecessary pressure, pain, or foreign body sensation, which induces the correct posture and further improves user satisfaction. In addition, due to the structure in which both the lumbar support itself and the horizontal support of the backrest to which the lumbar support is mounted are integrally molded and manufactured, the overall configuration is very simple, resulting in cost reduction and productivity improvement as well as greatly extending the service life. It has an effect.

Description

Backrest body for chair with lumbar support of three-dimensional elastic structure}

The present invention relates to a backrest for a chair, and more particularly, through structural improvement of the lumbar support provided in the backrest for a chair and improvement of the mutual coupling structure between the backrest and the lumbar support, when a user's load is applied to the lumbar spine As the three-dimensional elastic support of the support is configured to be realized, it is about a backrest for a chair that can be used more comfortably and comfortably in response to changes in the user's posture and load, while also inducing the correct posture.

In general, a chair with a backrest includes a seat portion supporting the buttocks of the user, a back portion supporting the user's back which is positioned perpendicularly to the seat portion and fixed to the rear surface of the seat portion, and is provided on the back portion or a separate support for the user's It includes a lumbar support that supports the lumbar spine, which is part of the back.

Furthermore, in order to comfortably support the user's back, a tilting apparatus capable of rotating the backrest in the forward and backward directions of the chair may be further provided at the lower end of the seat, and when such a tilting apparatus is further provided, the backrest The lower end is coupled to the tilting device. Therefore, since the upper part of the backrest rotates in the front/rear direction with the lower part as the center, when the user stretches or reclines his back for rest, the backrest part rotates forward and backward accordingly to stably support the user's weight. can do.

Such an existing back chair has the left and right spine back plates of a bending structure to support the curved state in which the thoracic and lumbar vertebrae are bent, as shown in Utility Model Registration No. 20-0230508, and the vertical support for the left and right spine back plates. A support, a horizontal support is formed at the center of the vertical support, and a neck plate supporting the cervical vertebrae mounted on the upper end of the horizontal support, and the vertical support is attached to the lower end of the chair seat to form the spine, which is a pillar of the human body. By supporting the cervical, thoracic, and lumbar vertebrae as they are in their curved state, it not only improves spinal health, but also creates a spinal curve that maintains a normal curve for the spine, which is not maintained in its natural curve due to displacement of the spine. There is a bar registered for a chair that has excellent effects in maintaining a healthy spine.

In addition, as in Patent No. 10-1044430, it is provided between a one-bag type climbing part that supports the left and right sides of the user's back at once, a climbing part support for supporting the climbing part, and an upper part of the climbing part and a climbing part support. A fixing unit that fixes the upper part of the climbing part to the climbing part support, and is provided between the lower part of the climbing part and the climbing part support. When an external force is applied to the climbing part, the elastic force is applied so that the lower part of the climbing part can move left and right with respect to the climbing part support. an elastic unit provided, and a lumbar support that is provided on the backrest support and presses the backrest to support the user's lumbar spine; In addition, a back support device for a chair including a forward and backward moving unit that moves the lumbar support back and forth has been registered.

Then, in the case of Registered Utility Model No. 20-0422122, the two backrest shell plates are spaced apart from each other in the lateral direction, and at the same time, two lumbar supports supporting the lumbar spine promoting comfort are formed on the left and right sides under the shell plate, and the backrest shell plates is coupled to the middle crosspiece by bolts as an elastic element, and the structure and shape of the two backrest outer plates are shaped to cover the back of both sides of the waist axis of the human body, and the ball in the axial direction (X axis) perpendicular to the seat surface When viewed as a whole, the two backrest outer plates have a round shape like an ellipse so that the back can be supported in a row. The curved part protrudes from the left and right sides, and the part in contact with the spine part of each shape of the outer plate of the backrest is formed in a straight line, and the elastic element is in a trapezoidal shape to fix the chair back. In order to prevent sagging of the chair back, the lower end is fixed at the lower center of the chair back, and the middle crossbar is fixed by a long hole and a bolt for fixing horizontal movement. and has been registered.

Subsequently, in the case of Registered Patent No. 10-2057900, as a lumbar support of a specific structure is applied to the back of a chair, the user adjusts the height of the lumbar support according to the physical condition, and then the chair is stably supported by the lumbar part of the human body. The lumbar support structure of the back of a chair that allows people to sit on it has been devised and registered.

However, existing lumbar supports for back chairs are manufactured with a very complex structure and mounted on the back body. Since it is made so that the lumbar support can be made for each user's body structure or at the user's preferred position, the adoption of such a complex flow structure makes the configuration of mutual objects very complicated and has the disadvantage of having to have high assembly and productivity. .

Therefore, effective lumbar support, which is the essential role of the lumbar support, has not been achieved, and although the lumbar spine should show elastic and variable support according to the user's movement, it is limited to simple mobility as described above and is improved, rather comfortable and comfortable It is true that it interferes with the function and action of inducing a sense of use and correct posture.

In particular, the lumbar support supports the user's body weight and load by being in close contact with the lumbar spine. However, most of the existing lumbar supports have a flat appearance and movement, so the tilting angle of the backrest or the support structure that does not correspond to the user's posture causes discomfort due to foreign body sensation, pain, or interference with the lumbar support. .

In addition, it is composed of excessively complex and many components, which acts as a cause of cost increase as well as decrease in productivity, and since a relatively strong load and weight are concentrated on the lumbar support, not only the lumbar support itself but also the backrest and It is true that the lifespan of the interconnection part is shortened, and there is a problem in that looseness, separation or frictional noise of the interconnection unit continuously occurs.

Republic of Korea registered utility model 20-0230508 (registered on May 2, 2001) Korean Registered Patent No. 10-1044430 (2011.06.20. Registration) Republic of Korea registered utility model 20-0422122 (registered on July 14, 2006) Korean Registered Patent No. 10-2057900 (2019.12.16. Registration)

The present invention is to improve the above problems, and the curved horizontal support is integrally formed on the backrest frame, and the curved support fastening part and the pair of elastic support parts are formed integrally with the lumbar support in the horizontal support. However, by configuring the curved support fastening part and the elastic support part to be integrally connected and formed by the elastic connection part having the upper curvature line and the lower curvature line of different shapes,

Along with the improvement to a very simple structure, in the process of the user's weight acting on the lumbar support, the elastic support organically and elastically transforms and moves according to the angle of the user's lumbar spine and the direction or size of the load, resulting in the most comfortable and comfortable state. It is an object of the present invention to provide a backrest for a chair having a segmented lumbar support of a 3D elastic structure, which allows the best support for the user's lumbar spine as well as close support.

In order to achieve the above object, the present invention provides a backrest for a chair equipped with a lumbar support facing the user's lumbar spine on the lower front side of the backrest frame,

The backrest frame; A curved horizontal support bent in the rearward direction is integrally formed between the vertical portions on both sides, and an accommodation groove corresponding to the curvature of the curved horizontal support is formed on the entire front surface of the curved horizontal support, but the center of the accommodation groove is fastened. A coupling protrusion having a ball is formed and fitting guides having square slit grooves are formed on both sides of the fastening hole and spaced apart from each other,

The lumbar support; A curved support fastening part having a curvature and size corresponding to the accommodating groove of the horizontal support is provided, and a pair of elastic support parts spaced apart on both sides are provided on the front side of the curved support fastening part, and the support fastening part and the elastic support part are attached to each end. It is integrally connected to each other by the elastic connection part connecting to each other, but at the center of the rear side of the curved support fastening part, a coupling guide groove into which the aforementioned coupling protrusion is inserted and a penetrating fastening hole are formed, and both sides of the coupling guide groove are formed with the aforementioned square. It is formed by protruding the slip locking tool to be inserted into the slit groove.

The present invention supports the user's lumbar spine in the best form while the lumbar support is elastically deformed in three dimensions according to the angle of the user's lumbar spine or the size and direction of the load in the process of the user's body weight acting on the backrest and the lumbar support. In addition to being able to use the back chair in a more comfortable and comfortable state, the lumbar support is elastically supported on the user's lumbar spine and side, so there is no unnecessary pressure, pain, or foreign body sensation, leading to correct posture and increasing satisfaction with use. Due to the structure in which both the lumbar support itself and the horizontal support of the backrest to which the lumbar support is mounted are integrally molded and manufactured, the overall configuration is very simple, reducing costs and improving productivity as well as extending service life. It has the effect of greatly prolonging it.

In addition, the elastic support part divided into two sides can support each independently and individually, so that even if the load is concentrated on the elastic support part on one side, such as when the user twists or leans to the side, it has the effect of stably supporting it elastically, as well as having an upright posture. Even when leaning on the back or applying a load, the split elastic support on both sides supports it in a balanced way, so it has the effect of continuously inducing correct posture.

In particular, in the case of the existing lumbar support, the user's spine and left and right parts directly contact the lumbar support, causing a feeling of foreign body or fatigue due to pressure, whereas the divided elastic support can avoid direct contact with the user's spine. It is spaced apart from each other so that the feeling of foreign body or fatigue can be significantly reduced, and when the user leans his back, the elastic supports on both sides push the both sides of the spine or the erector spinae muscles through the reaction force due to their excellent elasticity, so that the acupressure effect And a massage effect can be obtained.

1 is an overall perspective view of the backrest body of the present invention
Figure 2 is an exploded perspective view of the backrest body of the present invention
Figure 3 is an enlarged view of the back frame of the back support body of the present invention
Figure 4 is an enlarged perspective view of the lumbar support of the back support of the present invention
Figure 5 is another enlarged perspective view of the lumbar support of the backrest body of the present invention
Figure 6 is an enlarged cross-sectional coupling view of the main part of the backrest body of the present invention
Figure 7 is an enlarged cross-sectional separation view of the main part of the backrest body of the present invention
8 is an explanatory view of the action of the lumbar support for the backrest according to the load of the present invention

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

Prior to the detailed description of the present invention, the present invention may make various changes and may have various embodiments, and the examples described below and shown in the drawings are not intended to limit the present invention to specific embodiments. No, it should be understood to include all changes, equivalents or substitutes included in the spirit and scope of the present invention.

In addition, when a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but other components may exist in the middle. It should be understood that there is On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Then, terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In addition, terms such as "...unit", "...unit", and "...module" described in the specification mean a unit that processes at least one function or operation, which is hardware, software, or hardware and It can be implemented as a combination of software.

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

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

1 is an overall perspective view of the backrest of the present invention, Figure 2 is an exploded perspective view of the backrest of the present invention, Figure 3 is an enlarged view of the backrest frame of the backrest of the present invention, Figure 4 is the backrest of the present invention Figure 5 is another enlarged perspective view of the lumbar support of the backrest of the present invention, Figure 6 is an enlarged cross-sectional view of the lumbar part of the backrest of the present invention, Figure 7 is an enlarged perspective view of the backrest of the present invention This is an enlarged cross-sectional separation of the lumbar part.

As shown in the figure, the backrest body according to the present invention is applied to various structures of the backrest chair. Looking at the overall structure of a conventional backrest chair, a lower support body having a gas cylinder, an elevation shaft, and support angles in all directions; a cushion material or mesh seat; a backrest body mounted in a vertical direction from the rear side of the seat plate; armrests mounted on both sides of the seat; It is composed of a locking device located between the lower support and the seat plate and to which the lower end of the backrest is mounted, and in the present invention, the structural improvement of the lumbar support itself coupled to the backrest and the backrest and the lumbar support It is an improvement on the coupling structure between the spheres, and it will not be applied to a chair with a specific structure.

Accordingly, in the backrest of the present invention, in the backrest for a chair in which the lumbar support 200 facing the user's lumbar spine is mounted on the lower front side of the backrest frame 100, the backrest frame 100 includes; The curved crossbar 110 bent in the rearward direction is integrally formed between the vertical portions 101 and 101' on both sides, and the curved crossbar 110 is formed on the entire front surface of the curved crossbar 110. An accommodating groove 111 corresponding to the curvature is formed, and a coupling protrusion 113 having a fastening hole 112 is formed in the center of the accommodating groove 111, and a square slit groove 114 is formed on both sides of the fastening hole 112. The fitting guide portion 115 (115 ') having a is formed spaced apart from each other.

Here, the backrest frame 100 includes vertical portions 101 and 101' spaced apart on both sides and horizontal portions located at the upper and lower ends of the vertical portions 101 and 101' (symbols in the drawings are omitted). ), and the cross support 110 located on the lower side between the vertical parts 101 and 101' serves to mount the lumbar support 200, and the cross support The coupling protrusion 113 formed in the 110 and the fitting guides 115 and 115' play a role in stably coupling the lumbar support 200 to the horizontal support 110 and enabling flow in the coupled state. will do

In addition, the lumbar support 200; A curved support fastening part 210 having a curvature and size corresponding to the accommodating groove 111 of the horizontal support 110 is provided, and a pair of elastic support parts spaced apart on both sides are provided on the front side of the curved support fastening part 210. (220) (220') is provided, and the support fastening part 210 and the elastic support part 220 (220') are integrally connected to each other by the curved elastic connection part 230 (230') connecting each end to each other. Connection is formed, but at the center of the rear side of the curved support fastening part 210, a coupling guide groove 211 into which the aforementioned coupling protrusion 113 is inserted and a through fastening hole 212 are formed, and the coupling guide groove 211 On both sides of the slip lock 213, 213' inserted into the aforementioned square slit groove 114 is formed protrudingly.

At this time, the support fastening part 210 of the lumbar support 200 mutually couples and fixes the back frame 100 and the lumbar support 200, and at the same time provides additional elasticity to the lumbar support 200 under load. The pair of divided elastic support parts 220 and 220' are three-dimensionally variable according to the load change caused by the user's weight, maintaining excellent adhesion while maintaining a stable lumbar support. The curved elastic connection parts 230 and 230' on both sides integrally connect the support fastening part 210 and the elastic support part 210 and 210', and at the same time, the elastic support part 220 where the load acts (220') is organically deformed in connection with the support fastening part 210 so that the user's weight and load can be elastically supported.

In addition, the friction reducing protrusions 214 and 214' are further protruded from the upper and lower surfaces of the slip locking strips 213 and 213' formed on the curved support fastening part 210 of the lumbar support 200 described above. As configured, the above-described slip locking strips 213 and 213' are inserted into the square slit grooves 114 of the fitting guides 115 and 115' formed in the accommodating grooves 111 of the curved horizontal supports 110. As the load applied to the lumbar support 200 changes, the slip locking strips 213 and 213' are inserted and removed from the square slit groove 114. In order to reduce interference due to frictional resistance generated between the outer surface of the square slit groove 114 and the inner surface of the square slit groove 114, the friction reducing protrusions 214 and 214' are further formed to ensure smooth and smooth flow between them. .

In particular, in the aforementioned lumbar support 200, the upper and lower ends of the elastic support parts 220 and 220' are configured with heights extended in the upward and downward directions compared to the upper and lower ends of the curved support fastening part 210. It has a wider and flat surface and is formed to stably support the user's lumbar spine, and the mutual height difference between the support fastening part 210 and the elastic supporting part 220, 220' is continuous without a step. It is configured to be elastically connected to each other by the curved elastic connecting parts 230 and 230' having an upper curvature line 231 and a lower curvature line 232.

Therefore, in the lumbar support 200 of the present invention, the curved support fastening part 210 and the elastic supporting parts 220 and 220' are connected without step difference by the curved elastic connecting parts 230 and 230'. It is integrally molded with a curve, and the user's load acting on the elastic support parts 220 and 220' is evenly transmitted to the lumbar support 200 as a whole without section concentration or load in a specific part, and the user's load is You will be able to effectively distribute and support.

At this time, the lower curvature line 232 of the curved elastic connection part 230, 230' is a space between the lower sides of both sides of the curved support fastening part 210 and the lower part of the side end of the elastic supporting part 220, 220'. As it is configured to be expanded and connected, the supporting force of the elastic supporting parts 220 and 220' is formed so that the upper and lower parts act differently, and when the user's load acts on the elastic supporting parts 220 and 220' The elastic supporting part 220, 220' will be elastically deformed while the inner end is pushed to the rear starting from the elastic connecting part 230, 230' of the outer end, and the elastic supporting part 220, 220' Unlike the upper curvature line 231, which simply connects the outer tip of the support fastening portion 210 with the outer tip in a curved form, the outer lower end of the elastic support portion 220 (220') and the outer lower end of the support fastening portion 210 It is connected by the lower curvature line 232, which is relatively thick and bulges inward, so that when a load is applied to the elastic supporting part 220, 220', the upper side than the lower side of the elastic supporting part 220, 220' This makes it easier and faster to have a retractable type of movement.

This is because the upper part of the elastic support part 220, 220' is more easily bent according to the angle of the user's back in the process of the user tilting the upper body to the rear side, so that the entire upper and lower parts of the user's lumbar spine have even elasticity. In various existing lumbar supports, when the user tilts the upper body backward, a uniform reaction force is generated across the entire lumbar support, so the upper lumbar spine inevitably receives a more severe reaction force than the user's lower lumbar spine. Since it had a problem of concentration of pressure or pain, as described above, the lower curvature line 232 was configured to be connected in a more extended form than the upper curvature line 231, so that the elastic supporting parts 220 and 220' ), the upper side of the elastic supporting parts 220 and 220' is more easily bent according to the angle of the user's upper body when the load is applied to the upper and lower parts of the user's lumbar spine. The elastic support reaction force can act more evenly.

Subsequently, reinforcing ribs 221' and 221' connected to the lower curvature line 232 of the curved elastic connection parts 230 and 230' are provided on the entire lower end of the elastic supporting parts 220 and 220'. It is configured to protrude further downward to suppress the lower side of the elastic supporting portion 220, 220' from bending in the lateral direction. Since the lower horizontal part of 220' has a lower degree of elasticity than the upper horizontal part, paradoxically, when the user's weight and load act on the elastic supporting part 220, 220', the elastic supporting part 220, 220' The upper end of the user's lumbar spine, that is, the upper part of the user's lumbar vertebrae, which is in contact with it, is elastically supported relatively softly by the upper end of the elastic support part 220 (220') having a soft deformation, and the lower part of the user's lumbar vertebrae has a relatively strong elastic supporting force. It will be elastically supported more firmly by the lower ends of the parts 220 and 220'.

Therefore, the lower curvature line 232 of the curved elastic connecting portion 230, 230' connecting the curved supporting body 210 and the elastic supporting portion 220, 220' and the reinforcing rib portion 221 (221'), when a load due to the bending of the user's upper body is applied to the elastic support parts 220 and 220' in the form of a flat plate, the lower part of the user's lumbar spine, which is close to the waist and does not move much, has a stronger elastic support. and the user's upper lumbar spine, which is far from the waist and has a relatively large movement, gradually raises the soft elastic supporting force so that the elastic supporting force in an even form can act on the entire lumbar spine.

In addition, the pair of elastic support parts 220 and 220' configured in a form in which both ends are connected to the curved support fastening part 210 through the curved elastic connection parts 230 and 230' are molded, and the ends on the opposite side are mutually opposed to each other. As having this spaced split structure, when the weight and the load act on the elastic supporting parts 220 and 220' on both sides, the inner end of the divided elastic supporting parts 220 and 220' is pushed backward the fastest. The retraction deformation of the inner end can achieve the effect of the outer end of the elastic support portion 220, 220' being in close contact with the user's side, so that when the user bends the upper body or applies a load, a pair of The elastic supporting parts 220 and 220', due to the structural characteristics of the present invention, provide elastic support in an even shape to the entire lumbar spine of the user and at the same time provide stable adhesion as if wrapping the entire lumbar spine, so you can feel more comfortable and comfortable. You will be able to.

Subsequently, at the mutually opposite ends of the elastic supporting parts 220 and 220' of the lumbar support 200 as described above, curved ends 222 and 222' toward the curved support fastening part 210 are further formed. Accordingly, the ends of the elastic support portions 220 and 220' press the user's lumbar vertebrae sharply, thereby preventing foreign body sensation or pain from occurring.

Therefore, the elastic support parts 220 and 220' divided into two sides are capable of independently and individually supporting weight and load, so that even if the load is concentrated on the elastic support part on one side, such as when the user twists or tilts the body to the side, it is stable. As well as having the effect of providing elastic support, the divided elastic support parts 220 and 220' on both sides support it in a balanced way even when leaning back in a correct posture or applying a load, so the effect of improving scoliosis can be expected. It has the effect of continuously inducing the correct posture.

Accordingly, when the user's body weight and load act on the backrest of the present invention, in the initial state of application of the load, the inner ends of the elastic support portions 220 and 220' having the most elasticity, as shown in FIG. It will be deformed while being pushed to the side, and as a result, the elastic support parts 220 and 220' will begin to adhere to the entire waist including the user's lumbar region.

Subsequently, when the user brings the upper body more closely to the backrest or tilts the upper body to the rear side, a stronger load will be applied to the elastic supporting portion 220, 220', and thereby the elastic supporting portion 220, 220' The inner end of the will be pushed further to the rear. As the inner end of the elastic support part 220, 220' is pushed to the rear side, the outer end of the elastic support part 220, 220' is rather folded inward. will have a movement of the form, which will increase the deformation force in the inner direction for the outer end of the elastic support portion 220 (220') due to the curved shape on the plane of the curved horizontal support 110.

Therefore, at the initial point in time when the user's weight and load act, the elastic support parts 220 and 220' simply retract at the opposite ends to gradually increase the elastic supporting force, and then the user's weight strongly acts or When a load in the form of bending the user's upper body to the rear side acts, the mutually facing inner ends of the elastic supporting parts 220 and 220' further retreat, while the outer ends of the elastic supporting parts 220 and 220' also move forward. As shown in (b) of 8, rather, it shows the action of being curled inward, and it creates an elastic reaction force while surrounding the user's entire lumbar spine.

At this time, the slip locking strips 213 and 213' protruding from the curved support fastening part 210 of the lumbar support 200 are the square slit grooves 114 formed in the curved horizontal support 110 of the backrest frame 100. ), the curved support fastening part 210 stably guides the deformation in the inward direction while sliding without mutual separation within the backrest frame 100, and the curved support fastening part 210 itself of the lumbar support 200 It is deformed only in the front and rear directions without mutual separation within the accommodating groove 111 formed in the curved cross support 110, and the cross support 110 ) Even if the support fastening part 210 is coupled to the support fastening part 210 is inserted in the receiving groove 111, so even if deformation in the inward direction of the support fastening part 210 occurs, the support fastening part 210 ) is separated from the receiving groove 111 to create a coupled state that cannot be shaken or rotated, and at the same time, except for the mutually fastening part, free deformation from both ends of the curved support fastening part 210 to the inside of the front can be made.

Here, the coupling protrusion 113 formed in the center of the accommodating groove 111 of the curved horizontal support 110 of the backrest frame 100 is the coupling guide groove formed in the center of the curved support fastening portion 210 of the lumbar support 200 ( 211) through the fastening hole 212 formed in the coupling guide groove 211 to the fastening hole 112 formed in these coupling protrusions 113, a separately provided fixing bolt (the symbol in the drawing is omitted) is screwed As it is coupled, the simple coupling of the lumbar support 200 to the back frame 100 is made, and the lumbar support 200 is a cross support It will be able to be stably and easily assembled and fixed to (110).

Therefore, the three-dimensional elastic supporting force due to the sequential and organic deformation of the elastic supporting parts 220, 220' and the curved support fastening part 210 as described above and the supporting fastening part 210 and the elastic supporting parts 220, 220 at the same time ') Due to the upper and lower curvature lines 231 and lower curvature lines 232 and the reinforcing ribs 221 and 221' connecting the elastic support portions 220 and 220', the upper side is more than the lower side. As it is softly and easily bent, it will provide elastic support in response to the angle of the user's upper body. Eventually, the elastic support parts 220 and 220' wrap around the user's entire lumbar spine as if pressurizing, and the elastic support parts 220 and 220 ') Since it provides support by even reaction force on the entire surface and at the same time produces a form of elasticity proportional to the user's weight and size of load, the user can obtain a more comfortable and comfortable state as well as evenly distribute the user's entire lumbar spine. Due to the elastic support of the state, it is possible to use the chair with a backrest in a more correct posture.

In addition, since the lumbar support 200 of the present invention is made of a single molded object, simply one-point fastening of the single lumbar support 200 to the curved horizontal support 110 of the back frame 100 Also, as the mounting and installation of the lumbar support 200 is completed, assembly productivity is very excellent, and it can also contribute to extending the lifespan of the entire backrest or chair.

In particular, in the case of the existing lumbar support, the user's spine and left and right parts are in direct contact with the lumbar support, and there is a feeling of foreign body or fatigue due to pressure, whereas the divided elastic supports 220 and 220' are part of the user's spine. Since they are spaced apart from each other to avoid direct contact with the spine, the feeling of foreign body or fatigue in the spine can be significantly reduced. It serves to push both sides or erector spinae muscles in the opposite direction through the reaction force due to the high elasticity of the elastic supporting parts 220 and 220', so that the acupressure effect and massage effect can be obtained for the entire spine of the user.

The embodiments described in this specification and the configurations shown in the drawings as described above are merely the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, so various equivalents and modifications that can replace them It should be understood that there may be examples.

100: back frame 101,101 ': vertical part
110: curved horizontal support 111: receiving groove
112: fastening hole 113: coupling protrusion
114: square slit groove 115,115': fitting guide
200: lumbar support
210: curved support fastening part 211: coupling guide groove
212: fastening hole 213,213': slip system district
214,214': friction reduction protrusion
220,220': elastic supporting part 221,221': reinforcing rib part
222,222': bent end
230,230': curved elastic connection part 231: upper curvature line
232: lower curvature line

Claims (5)

In the backrest for a chair in which the lumbar support 200 facing the user's lumbar spine is mounted on the lower front side of the backrest frame 100,
The backrest frame 100; The curved crossbar 110 bent in the rearward direction is integrally formed between the vertical portions 101 and 101' on both sides, and the curved crossbar 110 is formed on the entire front surface of the curved crossbar 110. An accommodating groove 111 corresponding to the curvature is formed, and a coupling protrusion 113 having a fastening hole 112 is formed in the center of the accommodating groove 111, and a square slit groove 114 is formed on both sides of the fastening hole 112. The fitting guides 115 and 115' having a are formed spaced apart from each other,
The lumbar support 200; A curved support fastening part 210 having a curvature and size corresponding to the accommodating groove 111 of the horizontal support 110 is provided, and a pair of elastic support parts spaced apart on both sides are provided on the front side of the curved support fastening part 210. (220) (220') is provided, and the curved support fastening part 210 and the elastic support part 220 (220') are connected to each other by the curved elastic connection part 230 (230') connecting each end to each other. It is integrally formed, but at the center of the rear side of the curved support fastening part 210, a coupling guide groove 211 into which the aforementioned coupling protrusion 113 is inserted and a through-through coupling hole 212 are formed, and the coupling guide groove ( 211), a backrest for a chair having a divided type lumbar support of a 3D elastic structure, characterized in that the slip-locking strips 213 and 213' inserted into the aforementioned square slit groove 114 are formed protrudingly. sifter.
According to claim 1,
The slip restraints 213 and 213' formed in the curved support fastening part 210 of the lumbar support 200 are configured by further protruding the friction reducing protrusions 214 and 214' on the upper and lower surfaces. A backrest for a chair having a split type lumbar support with a 3D elastic structure.
According to claim 1,
The upper and lower ends of the elastic supports 220 and 220' are configured to have heights extended in the upward and downward directions compared to the upper and lower ends of the curved support fastening part 210, and the curved support having such a mutual height difference. The connection part 210 and the elastic supporting part 220, 220' are curved elastic connecting parts 230, 230' having an upper curvature line 231 and a lower curvature line 232 so that each tip is continuous without a step. To be mutually elastically connected by
The lower curvature lines 232 of the curved elastic connecting parts 230 and 230' further expand and connect to the space between the lower portions of both sides of the curved support fastening part 210 and the lower parts of the side ends of the elastic supporting parts 220 and 220'. A backrest for a chair having a split type lumbar support of a 3D elastic structure, characterized in that it is configured to be formed.
According to claim 3,
Reinforcing ribs 221' and 221' connected to the lower curvature line 232 of the curved elastic connection parts 230 and 230' are further protruded from the entire lower end of the elastic supporting part 220 and 220'. A backrest for a chair having a split-type lumbar support of a 3D elastic structure, characterized in that it is constituted by
According to claim 1,
At the ends of the elastic supporting parts 220 and 220' of the lumbar support 200, curved ends 222 and 222' toward the curved support fastening part 210 are further formed and configured. A backrest for a chair with a split lumbar support of a 3D elastic structure.

Images