KR102514183B1 - Office chair with elastic restoration structure of joint type backrest - Google Patents

Abstract

The present invention relates to a backrest chair used in homes, schools, or offices. The backrest chair includes a torsion spring and an elastic means combined at a hinge coupling part between a joint-type backrest plate and a support frame located behind the backrest plate to provide a vertically elastic restoration force of the backrest plate. The elastic means are horizontally arranged at both sides of the front end of the backrest plate to effectively buffer and restore the pressure applied to the center of the front end of the backrest plate. The torsion spring embedded in the front-end coupling part between the backrest plate and the support frame provides the vertically elastic restoration force of the backrest plate, and a bent press piece combined with the torsion spring provides a lateral elastic restoration force on the front end of the backrest plate, thereby conforming to a user's body structure through various bending actions, compensating and overcoming the disadvantages of the joint-type backrest plate, which is relatively prone to deformation compared to conventional backrest plates, providing comfort and effective support due to excellent conformity to individual user's body, and extending the lifespan of the backrest chair by preventing deformation of the joint-type backrest plate even during repetitive and continuous use.

Description

Office chair with elastic restoration structure of joint type backrest applied {Office chair with elastic restoration structure of joint type backrest}

The present invention relates to a backrest chair used at home, school, or office, and more particularly, a joint type backrest plate and a mutual hinge joint between a support frame hinged to the rear of the backrest plate. As the coupling is formed, the deformation force in the transverse direction of the backrest plate, which is deformed from the user's load acting on the backrest plate, is quickly restored by the elastic means to improve the elasticity of the backrest plate itself, and at the same time, the backrest plate It relates to an office chair having a joint-type back support to prevent deformation.

In general, a chair is provided with 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 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 chair, as in Registered Utility Model No. 20-0230508, has a bent structure to support the curved state in which the thoracic and lumbar vertebrae are bent, and a vertical support supporting the left and right spinal back plates. And, a horizontal support is configured 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 are mounted on the lower end of the chair seat to form the spine cervical vertebrae, which are the pillars of the human body By supporting the thoracic and lumbar vertebrae as they are in their curved state, it not only improves spinal health, but also provides a comfortable and A chair with excellent effects in maintaining a healthy spine has been registered.

However, the prior patents in the example above were developed by emphasizing the structural or geometric peculiarity of the backrest itself, and are made of a structure that does not have three-dimensional elasticity and stable support other than the elasticity of the backrest itself, making it difficult to use a chair for a long time. However, it still causes considerable fatigue and a sense of foreign body, and due to the free-flowing backrest, it does not match the body structure of each different user, so the closeness is reduced and comfort or comfort is not continuously felt.

Thus, the applicant of the present invention provides a backrest unit installed at the rear of the seating member to support the back of the user seated on the seating member, as in Registration Patent No. 10-1440118 in order to solve the above problems, The backrest unit is installed at the rear of the seating member and is installed at both ends of a support frame extending upward with respect to the seating member and first and second fixing arms installed at upper and lower ends of the support frame, and is installed in the width direction of the seating member. A round joint member having elasticity located on the left and right sides spaced apart from each other along the joint member, and the rigid support bar at both ends of the joint member is insert-molded with the soft joint member, respectively, and side reinforcing connections are formed on both ends of the rigid support bar. , An inlet groove is formed here, and molten resin is introduced and hardened during insert molding of a soft joint member, and a joint chair having a back seat formed with a plurality of support bars arranged spaced apart from each other along the vertical direction is devised and have been registered

In addition, as an improved invention of the preceding example, the applicant of the present invention installed a support frame extending upward from the rear of the seating member to support the back of the user seated on the seating member, as in Patent Publication No. 10-2018-0031988. It includes a backrest composed of a backrest frame and a cushion part, and a plurality of support bars arranged spaced apart from each other in the vertical direction of the backrest frame and both ends of the support bars as the molten resin is introduced and hardened during insert molding to provide elastic force The first and second brackets are formed of soft joints formed in a joint type and protrude toward both edges of the rear upper and lower ends of the backrest frame, and the first and second fixed arms extending left and right from the upper and lower ends of the support frame, respectively. When the two fastening holes are assembled in a state in which they are engaged and fastened to face each other, the backrest frame is designed to improve durability through the optimal design standard, and the first bracket of the backrest frame and the first fixed arm of the support frame Between the first fastening holes formed in, one end is closely supported on the back surface of the back frame and the other end is closely supported on the front surface of the first fixed arm, and a tension holding member having an elastic restoring force is mounted. In a joint chair having a backrest of a joint type A post about it has been made.

Next, the applicant of the present invention is an improved application having a more progressive action and effect on the joint-type backrest of the preceding example, integrally molding a plurality of crossbars inside the backrest as in the case of Registered Patent No. 10-2023461 However, in the vertical bends corresponding to the horizontal supports, flexural elastic parts of different thickness are formed between each support, and at the same time, the strength and modulus of elasticity of these flexural elastic parts are increased. Composite by insert molding Accordingly, the entire backrest bends according to the shape of the user's spine in response to the pressure of the user's weight and the action of leaning back, and adheres to the entire lumbar, thoracic, and cervical spine of the user, supporting the weight evenly across the entire backrest. Since excessive load is not concentrated on the spine, it can be expected to play a beneficial role in spinal health, and since the backrest is bent in the same shape as the user's spine, even if you take a long break or sleep, you can maintain a more comfortable and comfortable state without any strain on the spine. It has devised and registered a backrest that has the effect that can be achieved.

However, the above preceding examples are also made to maintain a comfortable and comfortable state through the improvement of the backrest plate itself and to be deformed in close contact with the user's body, and cannot prevent the backrest plate itself from being deformed due to continuous load. that has a problem.

That is, the backrest plate has a characteristic of fully supporting the load of the user's upper body, and when the user tilts the upper body or neck, the load is concentrated in the center of the upper part or the lumbar region, which is a specific part of the backrest plate. , In the course of such repetitive motions or continued use, the backrest plate has a disadvantage in that its elasticity and restoring force are reduced as physical properties or plasticity changes occur in the lumbar region and the center of the tip.

Therefore, even if the backrest plate is manufactured and released with excellent elasticity, the elasticity is weakened or lost in the process of repeated and long-term use, resulting in a decrease in adhesion to the user's back. Since the stable supporting force of the chair will not be achieved, eventually, the comfort and comfort will gradually decrease compared to the initial use, thereby shortening the lifespan of the backrest body and the backrest chair including it.

Republic of Korea registered utility model 20-0230508 (registered on May 2, 2001) Korean Registered Patent No. 10-1440118 (2014.09.03. Registration) Korean Patent Publication No. 10-2018-0031988 (published on March 29, 2018) Korean Registered Patent No. 10-2023461 (2019.09.16. Registration)

The present invention is to improve the problems as described above, and a joint type back plate and a mutual hinge joint between a support frame located on the rear side of the back plate are provided with a torsion spring for imparting resilient restoring force in the vertical direction of the back plate. The elastic means provided are coupled together, but the elastic means is arranged in a horizontal direction on both sides of the front end of the backrest plate to effectively buffer and restore the pressing force acting on the center of the front end of the backrest plate.

The joint-type backrest plate, which is relatively easily deformed through the effective elasticity restoration action on the front end of the backrest plate, while suppressing the sinking deformation of the front end of the backrest plate by the user's repeated and continuous load pressing force, has circular and elastic restoration properties. It is an object of the present invention to provide an office chair having a joint type back body characterized by being able to be stably maintained.

The present invention for achieving the above object is composed of a lower support body, a seat plate body, and a backrest body, and the backrest body has horizontal supports that are repeated up and down between the upper and lower supports, and each of these horizontal supports It consists of a joint-type backrest plate fixed to each other with a separately provided composite elastic body located between both ends of the backrest plate, and a separately provided support frame that is hinged to both sides of the back surface of the upper support and lower support of the backrest plate, The mutual hinge coupling between the upper support and the support frame is the mutual coupling between the insert fasteners protruding from both sides of the rear surface of the upper support and the fitting fasteners protruding on both sides of the front end of the support frame, and through these insert fasteners and fitting fasteners in the transverse direction at the same time. It is made by a screw shaft pin and a fastening bolt, and a torsion spring is inserted into the screw shaft pin, one end of which is locked to the upper support and the other end to the support frame. In the office chair to which the joint-type backrest configured to have elastic support and elastic restoring force in the vertical direction from the support frame is applied,

In order to hinge-couple the tips of the upper support and the support frame to each other, a pair of screw shaft pins spaced apart in the transverse direction are formed by combining separately provided bending pressing pieces disposed in mutually opposing directions, but the bending pressing pieces are the screw shaft pins Composed of a close-fitting part having an inserted coupling hole and a pressurized elastic part bent from one end of the close-fitting part toward the upper support of the backrest plate, the pressure generated by the load pressing force acting on the upper support of the backrest plate The elastic restoring force of the pressing elastic part, which acts when the elastic part's buffering capacity and the aforementioned load pressing force is lost, is configured to be spaced apart from the upper support of the backrest plate in the transverse direction.

In the present invention, the torsion spring inherent in the front end coupling part between the backrest plate and the support frame can take charge of the vertical restoring force of the backrest plate as in the prior art, and the bending pressure piece coupled with the torsion spring is attached to the front end of the backrest body. Responsive to the elastic restoring force in the lateral direction, it is compatible with the user's body structure in the best form due to various bending actions, but compensates for the disadvantages of the joint type backrest plate, which is relatively vulnerable to deformation compared to the existing backrest body. And what can be overcome, it is possible to create comfort and effective support due to excellent adhesion to each user's body, and at the same time to suppress deformation of the joint type backrest plate even in the process of repeated and continuous use, thereby further extending its useful life.

1 is a perspective view of the entire rear surface of a back chair to which a backrest body is coupled according to the present invention;
Figure 2 is an excerpted perspective view of the backrest body according to the present invention
Figure 3 is an exploded perspective view of the main part of the backrest body according to the present invention
Figure 4 is an exploded perspective view of the upper coupling part for the backrest body according to the present invention
Figure 5 is an enlarged perspective view of the front end of the support frame of the backrest body according to the present invention
Figure 6 is a planar cross-sectional view of the backrest body according to the present invention
Figure 7 is a cross-sectional view of the plane coupling part separated for the backrest body according to the present invention
8 is a load action diagram for the backrest body according to the present invention
9 is a view of another embodiment of the mutual coupling part for the backrest body according to the present invention;
10 is a perspective view showing another example of an elastic means for a backrest according to the present invention;
Figure 11 is a perspective view of another example of the elastic means of Figure 10

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 back of a back chair to which a backrest according to the present invention is coupled, FIG. 2 is an excerpted perspective view of the backrest according to the present invention, and FIG. 3 is an exploded perspective view of main parts of the backrest according to the present invention. 4 is an exploded perspective view of the top coupling part for the backrest according to the present invention, Figure 5 is an enlarged perspective view of the front end of the support frame among the backrest according to the present invention, Figure 6 is a planar cross-sectional view of the backrest according to the present invention, Figure 7 is a cross-sectional view of the planar coupling part of the backrest body according to the present invention.

First, the backrest body in the present invention can be applied to various types of backrest chairs used in homes, schools, offices, etc., and ordinary backchairs or office chairs are equipped with casters to enable movement or simple support angles in all directions. The seat plate 20 is coupled to the upper side of the lower support 10 made of only, and the backrest 30 is mounted on the rear side of the seat plate 20, and between the lower support 10 and the seat plate 20 By additionally mounting the backrest tilting device, various angle adjustments of the backrest body 30 may be performed.

The backrest body 30 applied to the backrest chair made of various structures and shapes is a cross support 130, 130' so that it is repeated up and down between the upper support 110 and the lower support 120. is disposed, and between the ends of both sides of each of the horizontal supports 130 and 130', a separately provided composite elastic body 140 and 140' is positioned to form a joint-type backrest plate 100 fixed to each other, and the backrest It corresponds to the improved invention for being composed of a separate support frame 200 hinged to both sides of the back surface of the upper support 110 and the lower support 120 of the plate 100, respectively.

Here, the backrest plate 100 is according to Registered Patent No. 10-2023461 previously registered by the applicant of the present invention, and is hinged to the upper and lower ends of the support frame 200, respectively. ) and the lower support 120, and between the upper support 110 and the lower support 120, horizontal supports 130 and 130 'that are repeated up and down are provided, and these upper supports ( 110), and between both ends of the lower support 120 and the cross support 130, 130', a composite elastic body 140, 140' corresponding to an elastic resin made by mixing elastomer and PE is inserted, The transverse supports 130, 130' and the composite elastic bodies 140, 140' are integrally molded and produced as a single entity through mutual insert molding.

Such a backrest plate 100, due to the excellent elasticity of the composite elastic bodies 140 and 140', when the pressure according to the user's weight is transmitted to the backrest plate 100, the entire backrest plate 100 moves according to the shape of the user's spine. It is made to prevent excessive load from being concentrated on a specific area along the spine as well as distributing support for the user's entire body weight while being bent and adhered to the user's lumbar, thoracic and cervical spine.

In addition, the support frame 200 is located on the rear side of the backrest plate 100 so that the upper and lower ends are hinged to each other, and the lower end of the support frame 200 is coupled to the seating part of the backrest chair, so that the backrest plate It serves to support the load by the user's weight as a whole while ensuring the stable flow and bending action of (100).

Accordingly, the backrest plate 100 and the support frame 200 have both upper and lower sides of the back surface of the backrest plate 100 as shown in Laid-Open Patent Publication No. 10-2018-0031988 previously filed by the applicant of the present invention. 200), the support frame 200 plays a role of stably supporting the user's entire load, and the backrest plate 100 organically adjusts according to the user's body structure As it bends and bends, it maintains a closely supported state on the user's back.

At this time, the mutual hinge coupling between the upper support 110 and the support frame 200 is performed on both sides of the front end of the support frame 200 and the insert fasteners 111 (111') protruding from both sides of the rear surface of the upper support 110 Mutual coupling between the fitted fasteners 201 and 201' and screw shaft pins 210 that are fastened by simultaneously penetrating the insert fasteners 111 and 111' and the fitting fasteners 201 and 201' in the transverse direction ) (210') and fastening bolts 220, 220', one end of the screw shaft pin 210, 210' is locked to the upper support 110 and the other end is locked to the support frame 200 A torsion spring 230, 230' is inserted, and the front end of the backrest plate 100 is elastically supported from the support frame 200 in the vertical direction by the compression and reaction force of the torsion spring 230, 230'. And it is configured to have an elastic restoring force.

In addition, a pair of screw shaft pins 210 and 210 ' spaced apart in the transverse direction in order to hinge the ends of the upper support 110 and the support frame 200 to each other are disposed in opposite directions. The pieces 300 and 300' are coupled and formed, but the bending and pressing pieces 300 and 300' have a close contact fixing part 302 having a coupling hole 301 into which the screw shaft pins 210 and 210' are inserted. ) and a pressure elastic part 303 bent from one end of the close fixing part 302 toward the upper support 110 of the back plate 100, and the close fixing part 302 is screwed. In the process of mutual coupling between the shaft pins 210, 210' and the fastening bolts 220, 220', the close contact fixing part 302 is strongly adhered to one side of the fitting fittings 201, 201', and the bending pressure is applied. It serves to fix the pieces 300 and 300', and in this fixed state, in the process of bending the back plate 100 rearward by the user's load, the pressurized elastic part 303 The pressurized elastic part that is deformed in the bending direction when the user's load and pressing force acting on the backrest plate 100 is removed while elastically buffering and supporting the backrest plate 100 while being compressed and bent in the direction of application of the force ( 303) is in charge of restoring force that pushes the backrest plate 100, which is about to be deformed by pressing, back to its original shape while the reaction force to return to its original position acts.

Therefore, the torsion springs 230 and 230' applied to the upper hinge joint between the upper support 110 and the support frame 200 have an elastic restoring force acting in the vertical direction of the backrest plate 100, The middle part serves to suppress deformation due to physical property change or plastic change due to repeated use, and the bending pressure piece 300 (300') above has the front end of the back plate 100 on the user's neck or head, etc. Since it will provide elastic restoring force in the lateral direction to prevent concave bending or deformation due to the pressing force by the force, the composite of the torsion spring 230, 230' and the bending pressure piece 300, 300' Due to the effective buffering capacity and elastic restoration, the joint-type backrest plate can be used for a long period of time while maintaining a stable shape and uniform bearing capacity.

In particular, the bending pressure piece 300 (300') may be made of hard synthetic resin, but it is more ideal to make it of a metal piece made of spring steel, and it is more ideal to have a strong elastic force along with the physical stability unique to spring steel. It would be desirable to be able to continuously impart to the plate 100, and the cross-sectional thickness, width, length, etc. of the spring steel may be manufactured in a variety of ways, thereby providing a buffering force and an elastic restoring force acting on the front end of the backrest plate 100. It may be configured so that this is added or subtracted.

Subsequently, one end of the aforementioned torsion spring 230, 230' and one end of the close contact fixing part 302 of the bent pressure piece 300, 300' are the fitting fittings 201, 201' of the support frame 200. ) As it is configured to be inserted into the seating groove 202 formed on one side, mutual holding force and fixing force can be further improved, and in the outer direction, which is one side of the seating groove 202, from the seating groove 202 By further forming the protruding locking jaw 203, one end of the torsion springs 230 and 230' located in the seating groove 202 and the end of the close-fitting part 302 are attached to the back plate 100 and the support In the process of interaction of the frame 200, it will be possible to prevent or block the separation or flow from the seating groove 202.

Therefore, in the case of the joint-type backrest plate 100, both sides of the upper and lower rear sides have a hinged shape, and as shown in FIG. Since the means is not provided at all, excessive deformation may occur in the vertical central portion of the backrest plate 100, and deformation due to such a load may eventually cause a shortened service life due to deformation of the backrest plate 100. Bar, By additionally combining and forming the bending pressure pieces 300 and 300' at the mutual hinge joint between the backrest plate 100 and the support frame 200, the vertical It is possible to suppress the deformation in the direction and to continuously provide elastic restoring force capable of suppressing the deformation in the horizontal direction by the bending pressing pieces 300 and 300'.

Then, as described above, the aforementioned bending and pressing pieces 300 and 300' can be variably applied so that the elastic restoring force can be added or subtracted by adjusting the cross-sectional thickness, width, or width, but in this case, the changed new manufacturing Since there will be inconvenience of having to replace and assemble the bending and pressing pieces, as shown in FIG. It was to make it easy to solve.

That is, a penetrating assembly screw hole 304 is formed in the pressing elastic part 303 of the bending and pressing pieces 300 and 300' described above, and the upper support of the backrest plate 100 is formed in the assembly screw hole 304. It is formed by screwing the resilience control bolt 310 toward 110, and rotates the resilience control bolt 310 in the forward direction while the end of the resilience control bolt 310 is in contact with the rear surface of the upper support 110. If so, the elastic adjustment bolt 310 rotates in place, while the pressing elastic part 303 gradually moves away from the rear surface of the upper support 110 and will have a stronger bending compression force and elastic reaction force.

Conversely, when the resilience control bolt 310 is rotated in the reverse direction, the pressurized elastic part 303 in a bending-compressed state will move toward the rear surface of the upper support 110, and due to the direction of this movement, the pressurized elastic part 303 in an elastic compression-deformed state The portion 303 will provide only the minimum compressive force and elastic reaction force to the upper support 110 while maintaining a state in close contact with the rear surface of the upper support 110 as the compressive force is gradually weakened.

Accordingly, the elastic reaction force (or the restoring force of the back plate) of the pressing elastic part 303 acting on the upper support 110 is increased or decreased according to the rotation direction of the elasticity control bolt 310, thereby creating a new bending pressure piece 300 (300'), it is possible to perform more effective buffer support and deformation prevention for the backrest plate 100 without replacing and assembling. In addition, the resilience adjustment bolt 310 is used for a long period of time in the backrest plate 100 in addition to the purpose of adding or subtracting the buffering support force and the elastic reaction force acting on the backrest plate 100. Periodically rotate the resilience control bolt 310 in the forward direction so that the elastic reaction force by the bending pressure pieces 300 and 300' on both sides can be maintained at a constant level, thereby suppressing deformation of the backrest plate and at the same time reducing its service life can be further extended.

Next, in the present invention, as shown in FIG. 10, a pair of bending pressing pieces 300 (300') located on both sides of the upper support 110 of the backrest plate 100 and the hinges on both sides of the front end of the support frame 200. ) is composed of a single object by the middle pressing part 305 connecting the opposite ends of the pressing elastic parts 303 facing each other, and the middle pressing part 305 is the upper support 110 of the back plate 100. ), the center is bent toward the center, and the two points of the elastic pressure portion 303 located at both ends of the bending pressure piece 300 as a single object and the additional point by the middle pressure portion 305 It may be configured to elastically adhere to the rear surface of the upper support 110 in the form of a complex three-point support.

Accordingly, it is possible to quickly mount the bending pressure piece 300 composed of a single object, as well as three points due to the bending pressure elastic part 303 disposed at both ends and the bending middle pressure part 305 disposed in the center. Since continuous elasticity is given to the upper support 110 of the backrest plate 100, even if the upper support 110 is temporarily deformed by the user's load, the bending pressure piece 300 having the three-point support form as described above ) It can quickly return to its original shape due to the elastic repulsive force, and even if the user applies excessive force to the upper support 110, such as bending the neck, the bending pressure piece 300 of these three-point support can reduce this deformation force Since it will cushion, it will provide a more elastic form of support.

In particular, as shown in FIG. 11, as shown in FIG. 11, as shown in FIG. (130) (103') It can also be configured by integrally further forming a central elastic band 306 elastically adhered to the back surface, such a central elastic band 306 is a horizontal support bar 130 arranged vertically It stably supports the central part in the vertical direction of 130' to effectively buffer and support the load acting on the center of these horizontal supports 130 and 130', that is, the part corresponding to the spine, as well as to protect against excessive load. Since the horizontal supports 130 and 130' will continuously provide elastic repulsive force or restoring force to prevent the backrest from being deformed in the rearward direction, eventually, the backrest plate itself including the backrest plate as well as the backrest chair having such a backrest body Its service life can be further extended.

As a result, the present invention provides elastic restoring force in the vertical direction by the existing torsion spring and elastic restoring force in the lateral direction by the separately provided bending pressure piece at the upper coupling part that hinges the backrest plate and the support frame of the joint type to each other. This is provided or directed at the same time so that the user's load can be effectively buffered and supported, and at the same time, deformation of the backrest plate due to excessive load and long-term repetitive load is prevented. This is to ensure that the backrest plate can continuously and stably maintain its original shape.

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.

10: lower support
20: Seat
30: backrest
100: back plate
110: upper support 111,111 ': insert fastener
120: lower support
130,130': cross support
140,140': Composite elastic body
200: support frame 201,201': fitting fastener
202: set home 203: locking jaw
210,210': screw shaft pin
220,220': fastening bolt
230,230': torsion spring
300,300': bending and pressing piece 301: coupling hole
302: close-fitting part 303: pressurized elastic part
304: assembly screw hole 305: intermediate pressing part
306: central elastic band
310: elasticity adjustment bolt

Claims (5)

From an office chair in which the seat plate 20 is provided on the lower support body 10 and the back support body 30 is coupled to the rear side of the seat plate 20, the back support body 30 includes the upper support 110 and the lower support ( 120), horizontal supports 130 and 130' that are repeated up and down are disposed, and between both ends of each of these horizontal supports 130 and 130', a composite elastic body 140 and 140' provided separately is located and fixed to each other, joint-type backrest plate 100, and the upper support 110 and lower support 120 of the backrest plate 100 described above. Separately provided support frame 200 hinged to both sides of the back surface, respectively. ), but the mutual hinge coupling of the upper support 110 and the support frame 200 is the insertion fastener 111, 111 'protruding from both sides of the rear surface of the upper support 110 and the front end of the support frame 200 Mutual coupling between the fittings 201 and 201' protruding on both sides and screws that pass through these inserts 111 and 111' and the fittings 201 and 201' in the lateral direction at the same time It is made by the shaft pins 210 (210') and the fastening bolts 220 (220'), and one end of the screw shaft pins 210 (210') is held to the upper support 110 and the other end is the support frame 200 ) In the office chair to which the joint type backrest configured by inserting the torsion springs 230 and 230 'locked is applied,
A pair of screw shaft pins 210 and 210 ' spaced apart in the transverse direction in order to hinge-couple the tips of the upper support 110 and the support frame 200 to each other are separately provided with a bent pressure piece disposed in a mutually opposing direction ( 300) (300') are formed by combining each other, but the bending pressure pieces 300 and 300' are close contact fixing parts 302 having coupling holes 301 into which the screw shaft pins 210 and 210' are inserted. , It is composed of a pressure elastic part 303 bent from one side end of the close fixing part 302 toward the upper support 110 of the backrest plate 100, to the upper support 110 of the backrest plate 100. The cushioning holding force of the pressing elastic part 303 generated due to the applied load pressing force and the elastic restoring force of the pressing elastic part 303 acting when the aforementioned load pressing force is lost are transverse to the upper support 110 of the backrest plate 100. An office chair with a structure for restoring elasticity of a joint-type backrest, characterized in that it is configured to act in a spaced direction.
According to claim 1,
One end of the torsion spring 230, 230' and the end of the contact fixing part 302 of the bending pressure piece 300, 300' on one side of the fitting fittings 201, 201' formed in the support frame 200. A seating groove 202 for insertion is formed, and at one side of the seating groove 202, one end of these torsion springs 230 and 230 'and the close contact fixing portion of the bending and pressing pieces 300 and 300' ( 302) An office chair with an elastic restoring structure of a joint-type backrest, characterized in that it is configured by further forming a locking jaw 203 to prevent the end from being separated from the seating groove 202.
According to claim 1,
A penetrating assembly screw hole 304 is formed in the pressing elastic part 303 of the bending pressure piece 300 (300'), and the upper support 110 of the backrest plate 100 is formed in the assembly screw hole 304. By screwing the resilience control bolt 310 toward you, the elastic restoring force of the pressing elastic part 303 acting on the upper support 110 according to the rotation direction of the resilience control bolt 310 is configured to increase or decrease Joint characterized in that Type An office chair with a structure for restoring the elasticity of the backrest.
According to claim 1,
The pair of bending and pressing pieces 300 and 300' are composed of a single entity by an intermediate pressing portion 305 connecting mutually opposite ends of the pressing elastic portion 303, and the intermediate pressing portion 305 is a backrest The two-point pressure elastic part 303 and the middle pressure part disposed on both sides of the bending pressure piece 300, which is a single object, and is formed in a form in which the center is bent toward the upper support 110 of the plate 100. An office chair with a structure for restoring elasticity of a joint-type backrest, characterized in that it is configured to elastically adhere to the rear surface of the upper support 110 in the form of a three-point support, which is a complex form of additional points by (305).
According to claim 4,
On the lower side of the middle pressing part 305, a central elastic band 306 elastically adhered to the rear surface of the horizontal supports 130 and 103' of the backrest plate 100 is integrally formed, so that the central elastic band 306 ) to the center vertical direction of the backrest plate 100. An office chair to which the elastic restoration structure of the joint type backrest is applied, characterized in that it is configured to increase the left shoulder support and elastic restoring force.

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