KR102011724B1 - Chair with increased back structure - Google Patents

Abstract

The object of the present invention is to provide a chair having an improved back structure, the configuration of the present invention is connected to the back of the chair 6, the main back frame 20 disposed on the back of the back 6; And a supporter 30 connected to the main back frame 20 and the backrest 6, wherein the main back frame 20 includes a frame base connected to a bottom bracket provided on the seat plate 4 of the chair. 22); A pair of main frame bars 24 connected to a lower end of the frame base 22 and extending upward and connected to a rear portion of the backrest 6 via a hinge; A connection back frame bar 26 connected to the pair of frame bars and arranged in a horizontal direction, wherein the supporter 30 is formed in a bar shape extending in a horizontal direction and a connection insert piece 32 is formed on a rear surface of the support bar 30. Is provided, the connecting insert piece 32 is configured to be inserted into the insert coupling groove (26A) formed in the connecting back frame bar 26, the supporter 30 and the main back frame 20 is a connector ( 40) is configured to be connected to each other.

Description

Chair with increased back structure {Chair with increased back structure}

The present invention relates to a chair having an improved backrest structure, and more particularly, the support structure of the main part provides a more comfortable and smooth tilting of the backrest while supporting the back part of the chair occupant more stably. A chair with an improved backrest structure configured to be possible.

In general, the chair has a structure in which the backrest is provided to support the user's back to a seat formed to seat the user.

In the case of a chair having a backrest, it can support the back and waist of the user seated in the seat in a correct posture, thereby protecting the seat of the seater.

Chair according to the prior art is composed of a seat plate supporting the buttocks of the seat, a backrest for supporting the back, and a frame for fixing the seatboard and the backrest.

In addition, the frame and the backrest is coupled to each other by screwing, the elastic means is installed so that the backrest can be elastically folded in the front and rear direction.

However, in the past, the support for the backrest portion supporting the back of the seated person is relatively weak in many cases, and in order to satisfactorily increase the support for the backrest portion, the backrest support structure itself is complicated.

In addition, the existing chair has a problem that it is not satisfactory in the soft and comfortable tilting function to be moved only once by the tilting mechanism when the seat, such as when seated on the seat.

Domestic registered patent No. 10-1505670 (registered on March 18, 2015) Domestic Registration Utility Model No. 20-0409172 (registered Feb. 13, 2006) Korean Patent Publication No. 10-1990-7001202 (published Dec. 1, 1990)

The main object of the present invention is to maintain the support of the back of the chair firmly by the main back frame and the supporter as the main part can support the seat of the seat more stably, a new configuration implemented to enable a tilting function of the soft back comfortable It is to provide a chair with improved backrest structure.

According to the present invention for solving the above problems, the main back frame is connected to the back of the chair disposed on the back of the back; There is provided a chair having an improved backrest structure, including a supporter connected to the main backframe and the backrest.

The supporter is configured to be rotated in an up and down direction with respect to the main back frame when viewed from the side of the main back frame.

The main back frame may include a lower frame part connected to a bottom bracket provided on a seat plate of the chair; A pair of main frame bars connected to a lower part of the lower frame part and extending upwardly and connected to a rear part of the backrest via a hinge part; A connection back frame bar connected to the pair of frame bars and arranged in a horizontal direction; wherein the supporter is configured to have a bar shape extending in a horizontal direction, and a connection insert piece is provided on a rear surface of the connection insert piece. It is configured to be inserted into the insert coupling groove formed in the connection back frame bar, the supporter and the main back frame is characterized in that configured to be connected to each other by a connector.

Both ends of the supporter is connected to the coupling block provided on both sides of the rear of the backrest via a connector.

The supporter has a pair of left and right bending reinforcement frame portions extending to further enter the rear side of the backrest when viewed from above, and the bending reinforcement frame portion is connected to the left and right pair of coupling block portions at the rear of the backrest via the connector. It is characterized by.

The main back frame further includes a rear main back frame connected to an upper end of the pair of left and right main frame bars, and the rear main back frame is inclined at an angle from the rear of the back to the rear when viewed from the side of the main back frame. Characterized in that arranged to lose.

The chair having an improved back structure according to the present invention has a main back frame acting as a tilting mechanism when the user tilts his back and at the same time, the supporter also acts as a tilting mechanism, thereby providing a smoother and more comfortable tilting effect.

In addition, the supporter, which is the main part of the present invention, is composed of engineering plastics, so that the support is tilted once more to realize a softer and more comfortable tilting function.

Engineering plastics mainly used in automotive parts belong to the middle stage of crystalline plastics.They include PA (POLY AMIDE), POM (POLY OXY METHYLENE, POLY ACETAL), PC (POLY CARBONATE), strong crystallinity, The cost is low compared to super engineering plastics.

Engineering plastics are not only excellent in strength and elasticity, but also excellent in impact resistance, abrasion resistance, heat resistance, cold resistance, and chemical resistance, and are applied to various fields such as cameras, watch parts, and aircraft structural materials.

Conventional chairs have a tilting mechanism that moves once when the back is seated, but in the present invention, such a highly elastic engineering plastic (PA6 + GF30%) is applied to the support of the back frame to operate as a tilting mechanism. In addition, the support made of highly elastic engineering plastic is once again applied as a tilting mechanism to provide a softer and more comfortable tilting function based on the hinge part (ie, the part where the main back frame is connected to the chair's back). It works.

1 is a rear perspective view of a chair having an improved back structure according to the present invention;
Figure 2 is a half-cut perspective view of the main back frame and the supporter that is the main part of the present invention
3 is an enlarged cross-sectional view of the main part shown in FIG.
Figure 4 is a side view of a chair with improved backrest structure of the present invention
Figure 5 is a side view showing a cut part of the coupling structure of the main back frame and the supporter of the main part of the chair shown in FIG.
FIG. 6 is a rear view of a chair having an improved backrest structure shown in FIG. 1, and a rear view showing a part of a coupling structure of a supporter and a backrest.
7 is a plan view of FIG. 1
FIG. 8 is a side view showing a part of a modified coupling structure of a main back frame and a supporter, which are main parts of the chair shown in FIG. 4;
FIG. 9 is a side view illustrating a part of another modified coupling structure of the main back frame and the supporter, which are main parts of the chair shown in FIG. 4;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description. In the drawings, the same reference numerals are used for the same parts. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but between components It will be understood that may be "connected", "coupled" or "connected".

Referring to the drawings, the chair having improved backrest structure according to the present invention has a seat plate 4 coupled to the leg 2, and the backrest 6 is arranged at the rear end of the seat plate 4 is the same as the conventional configuration. In this case, the present invention basically includes a main back frame 20 and a supporter 30 as an improved structure of the backrest.

The main backframe 20 includes a frame base 22, a main frame bar 24, a connecting backframe bar 26, and a rear main backframe 20.

The frame base 22 has a rectangular block shape. The frame base 22 is configured in a block shape protruding forward when viewed from the side of the main backframe 20. The frame base 22 is connected to the bottom bracket provided on the seat plate 4 of the chair. The frame base 22 is connected to the bottom bracket protruding from the bottom of the seat plate 4 by a fastener such as a connecting bracket and a bolt 42.

The singer main frame bar 24 is connected to the frame base 22. The lower end of the main frame bar 24 is integrally connected to the frame base 22. The main frame bar 24 is arranged in the vertical direction. A pair of main frame bars 24 are arranged in the vertical direction. The pair of main frame bars 24 are arranged next to each other. The frame base 22 is disposed in the horizontal direction when viewed from the side of the main back frame 20, and the main frame bar 24 is disposed in the vertical direction. On the other hand, the main frame bar 24 is composed of a rear inclined frame bar portion and a front inclined frame bar portion. The lower end of the rear inclined frame bar is integrally connected to the frame base 22, and the lower end of the front inclined frame bar is integrally connected to the upper end of the rear inclined frame bar. The rear inclined frame bar portion is inclined from the rear of the backrest 6 to the rear when viewed from the side of the main backframe 20, and the front inclined frame bar portion is viewed from the side of the main backframe 20 for the backrest 6 ) Is inclined forward toward the rear side.

At this time, the reinforcing connection portion 24A connected to the pair of main frame bars 24 is further provided. Both side ends of the reinforcing connection portion 24A are integrally connected to the inner surface of the pair of main frame bars 24. The reinforcement connection part 24A is comprised in square plate shape.

The pair of main frame bars 24 are connected to the rear of the backrest 6 via a hinge portion. The area between the lower end and the upper end of the main frame bar 24 is connected to the back of the backrest 6 by a hinge part. In the present invention, the portion where the rear inclined frame bar portion and the front inclined frame bar portion are connected is connected to the rear surface of the backrest 6 by a hinge portion.

The back frame bar 26 is connected to the pair of main frame bars 24. Both ends of the connecting backframe bar 26 are integrally connected to the inner surface of the pair of main frame bars 24. The connecting backframe bar 26 is arranged in the horizontal direction.

The main backframe 20 is connected to the backrest 6 of the chair and is disposed behind the back of the backrest 6, wherein the connecting backframe bar 26 is in the horizontal direction when viewed from behind the main backframe 20. The pair of main frame bars 24 are arranged in the vertical direction.

The main backframe 20 further includes a rear main backframe 20 connected to an upper end of a pair of left and right main frame bars 24.

The rear main backframe 20 is composed of a pair of rear main frame bars 24 and rear connection backframe bars 26.

Lower ends of the rear main frame bars 24 are integrally connected to upper ends of the pair of main frame bars 24, respectively. The rear main frame bars 24 are arranged in parallel with each other while extending in the vertical direction when viewed from behind the back of the chair 6.

Both ends of the rear connecting backframe bar 26 are integrally connected to the inner surface of the pair of rear mainframe bars 24. When viewed from behind the back of the chair 6, the rear connecting backframe bar 26 is arranged in the horizontal direction.

The rear main backframe 20 is inclined at an angle from the rear of the backrest 6 to the rear of the backrest 6 when viewed from the side of the main backframe 20 while being connected to the backrest 6 of the chair. It is arranged to open. The rear main backframe 20 is arranged to be inclined further rearward from the backrest 6 than the pair of mainframe bars 24. The rear main back frame 20 has a structure arranged to be wider and wider toward the back of the chair 6 as it goes from the lower side to the upper side when viewed from the side of the chair.

The main back frame 20 is a frame base 22, a pair of main frame bar 24, reinforcing connection portion 24A, connecting back frame bar 26, the rear main back frame 20 is integrally connected. The main back frame 20 itself is made of plastic with elasticity. When the person seated on the seat plate 4 of the chair is sitting back, the main back frame 20 is also backed up together with the chair back 6 while retaining elastic force, and the chair occupant rests on the back 6 When the force is removed, the main backframe 20 is elastically restored to its original position.

The main back frame 20 is provided with an insert coupling groove 26A. The insert coupling groove 26A is provided at the connection back frame bar 26 constituting the main back frame 20. The insert coupling groove 26A is configured in the shape of a square groove. The insert engaging groove 26A communicates with the front side of the connecting backframe bar 26. That is, the insert coupling groove 26A has a rectangular groove shape having an upper groove forming wall, a lower groove forming wall, and a rear groove forming wall, and the insert coupling groove 26A is formed in front of the connecting back frame bar 26. It is a connected structure. The insert engaging groove 26A is provided in the middle portion between both ends of the connecting backframe bar 26.

A nut 44 is provided inside the connection back frame bar 26, which is a main part of the main back frame 20. The nut 44 may be embedded in the insert injection mold 26 inside the connecting backframe bar 26. Inside the connecting backframe bar 26 may be provided with a through-hole communicating from the front to the front end of the nut 44. The front end of the nut 44 may also be configured to be exposed in front of the connecting backframe bar 26. At this time, a pair of nuts 44 are embedded in the connecting backframe bar 26. Nuts 44 are disposed on the left and right sides of the insert coupling groove 26A. A pair of nuts 44 are embedded in the connecting backframe bar 26. Precisely, a pair of nuts 44 are embedded in the connecting backframe bar 26 and arranged in the insert coupling groove 26A.

The supporter 30 has a bar shape having a predetermined length. The rear surface of the supporter 30 is provided with a connection insert piece (32). The connection insert piece 32 is provided in the middle part between the both ends of the supporter 30. As shown in FIG. The connection insert piece 32 is a block shape protruding backward from the back of the supporter 30. The connection insert piece 32 is comprised in the shape of a square block provided with a front part, an upper face part, a bottom face part, and a back part. The front part of the connection insert piece 32 is integrally connected to the back of the supporter 30. That is, the supporter 30 is integrally connected to the rear surface and has a connection insert piece 32 which protrudes further to the rear side.

The supporter 30 has a pair of left and right tilting support portions 30B extending inclined forward when viewed from above. The supporter 30 is formed in a bar shape having a center support portion 30A and a pair of left and right tilting support portions 30B in which inner ends are integrally connected to both ends of the center support portion 30A.

Both ends of the supporter 30 are connected to the back of the back of the chair 6 by the connector 40 to be described later and at the same time connected to the main backframe 20, the supporter 30 is connected to the main backframe 20 When viewed from the top of the backrest 6 while being connected to the back of the backrest 6 at the same time, the left and right pairs of tilting support portions 30B extend in such a way that they further enter the backside of the backrest 6. When viewed from the top of the backrest 6, a pair of tilting support portions 30B are arranged at a predetermined angle from the rear side of the backrest 6, and the center support portion 30A is arranged with the rear surface of the backrest 6; The structure is arranged side by side.

In this case, a plurality of tilting guide grooves 34 are provided on at least a front surface of the front and rear surfaces of the supporter 30. Each tilting guide groove 34 is a groove shape extending in the vertical direction. The plurality of tilting guide grooves 34 are arranged side by side at regular intervals on the supporter 30. In the present invention, the plurality of tilting guide grooves 34 may be arranged in parallel with each other on the front of the pair of left and right tilting support parts 30B of the supporter 30.

Inside the supporter 30 is provided with a connector 40 insert hole communicated to the front and rear.

In the present invention, the connector 40 insert hole includes a shaft insert hole and a head insert hole.

The shaft insert hole communicates with the rear surface of the supporter 30.

The head insert hole is connected to the front surface of the supporter 30 at the same time as the shaft insert hole.

Therefore, the connector 40 has an insert hole provided in the supporter 30, and at the same time, has a structure penetrated through the front and rear surfaces of the supporter 30.

On the other hand, the inner diameter of the head insert hole is larger than the inner diameter of the shaft insert hole.

At this time, the supporter 30 may be provided with an elastic body receiving hole connected to the back of the supporter 30 while being connected to the shaft insert hole. When the elastic body receiving hole is provided inside the supporter 30, the inner diameter of the elastic body receiving hole is larger than the inner diameter of the shaft insert hole. On the other hand, the elastic body (EM) may be embedded in the elastic receiving hole. The elastic body EM may be configured as a spring. The elastic body EM takes a structure interposed between the supporter 30 and the main back frame 20. An elastic body EM is interposed between the supporter 30 and the connecting back frame bar 26 of the main back frame 20. More specifically, the elastic body EM is interposed between the insert coupling piece of the supporter 30 and the insert coupling groove 26A of the connecting back frame bar 26. The elastic body EM may be made of urethane bonded to the outer circumferential surface of the bolt shaft 42B of the bolt 42. As such, the elastic body EM may be adopted as long as it is an elastic member such as a spring or urethane.

The connector 40 is provided with at least one pair of insert holes in the supporter 30. One end of the connector 40 insert holes are disposed on both sides of the supporter 30 based on a center line between both ends of the supporter 30. The pair of connector 40 insert holes are arranged one each on both the left and right sides of the connection insert piece 32 with respect to the center line between the left and right side portions. That is, the supporter 30 has a structure in which the connection insert piece 32 protrudes from the center portion of the rear surface thereof, and the connector 40 insert holes are provided on the connection insert piece 32 one by one on both the left and right sides thereof.

The nut 44 embedded in the connecting backframe bar 26, which is a main part of the main backframe 20, is configured to meet the insert hole 40 of the supporter 30. The insert hole 40 of the supporter 30 is inserted into the connecting back frame bar 26 while the connecting insert piece 32 of the supporter 30 is inserted into the insert coupling hole of the connecting back frame bar 26. The nut 44 is met.

The supporter 30 is connected to the main back frame 20 by the connector 40. In the state in which the supporter 30 is disposed in the horizontal direction, a connection insert piece 32 protruding from the rear surface of the supporter 30 is inserted into an insert coupling hole formed in the connection back frame bar 26 of the main back frame 20. The bolt 42 is inserted into the connector 40 insert hole of the supporter 30 in the inserted state, and the shaft of the bolt 42 is coupled to the nut 44 embedded in the connecting back frame bar 26. The supporter 30 may be connected to the main back frame 20 by the connector 40. The bolt 42 and the nut 44 become the connector 40 for maintaining the supporter 30 connected to the main back frame 20.

At this time, the head 42A of the bolt 42 is embedded in the head insert hole formed in the supporter 30, and the bolt shaft 42B of the bolt 42 is inserted into the shaft insert hole in the supporter 30. It is built. When the supporter 30 has an elastic receiving hole connected to the back of the supporter 30 while being connected to the shaft insert hole, the bolt shaft 42B of the bolt 42 also penetrates the elastic receiving hole. Take a structure fastened to the nut 44 embedded in the main back frame 20.

On the other hand, the inner diameter of the head insert hole is larger than the outer diameter of the head 42A of the bolt 42, the inner diameter of the shaft insert hole is larger than the outer diameter of the bolt shaft 42B, the bolt 42 Space between the head 42A of the head) and the head insert hole in the supporter 30 is secured, and the space between the bolt shaft 42B of the bolt 42 and the shaft insert hole of the supporter 30 Space is secured.

In addition, the cross-sectional area of the insert coupling hole formed in the connecting back frame bar 26 of the main back frame 20 is larger than the cross-sectional area of the connecting insert piece 32 of the supporter 30. A space (rotational working space) at a predetermined interval is secured between the outer surface of the connecting insert piece 32 and the insert coupling hole of the connecting back frame bar 26 of the main back frame 20.

The nut 44 is provided inside the supporter 30. The nut 44 may be inserted into the injection molding method in both ends of the supporter 30. Inside both ends of the supporter 30 may be provided with a through-hole communicating with the front end of the nut 44. The front end of the nut 44 may be configured to be exposed at the end of the supporter 30. The nut 44 is embedded one by one at the ends of both the left and right tilting support portions 30B of the supporter 30.

The left and right coupling block portions 8 protruding from the back of the chair 6 are provided with support holes 30 and insert holes 40 connected from one side to the other side.

In the present invention, the supporter 30 connector 40 insert hole includes a shaft insert hole and a head insert hole.

The shaft insert hole communicates with the inner side of the coupling block 8. The shaft insert hole is arranged in the direction of the outer surface and the inner surface of the coupling block portion 8 provided on the back of the backrest (6).

The head insert hole is connected to the outer surface of the coupling block portion 8 at the same time as the shaft insert hole.

Thus, the connector 40 insert hole is provided in the interior of the coupling block portion 8 protruding backward from the backrest 6 of the chair and at the same time both sides of the coupling block portion 8, that is, the coupling block portion 8. It takes a structure penetrated to the inner side and the outer side of the).

On the other hand, the inner diameter of the head insert hole of the coupling block 8 provided on the back of the chair back 6 is larger than the inner diameter of the shaft insert hole.

At this time, the inside of the coupling block portion 8 may be provided with an elastic receiving hole connected to the inner surface of the coupling block portion 8 while being connected to the shaft insert hole. When the elastic body accommodating hole is provided inside the coupling block portion 8, the inner diameter of the elastic body accommodating hole is larger than the inner diameter of the shaft insert hole.

The nut 44 embedded in the supporter 30 is configured to meet the insert hole 40 of the coupling block 8 provided on the back of the backrest 6. A nut 44 embedded in both ends of the supporter 30 is supported by the backrest 6 of the chair while the connecting insert piece 32 of the supporter 30 is inserted into the insert coupling hole of the connecting backframe bar 26. It meets the insert hole 40 of the coupling block 8 provided on the back.

Both ends of the supporter 30 are connected to the chair back 6 by the connector 40. In the state in which the supporter 30 is disposed in the horizontal direction, a connection insert piece 32 protruding from the rear surface of the supporter 30 is inserted into an insert coupling hole formed in the connection back frame bar 26 of the main back frame 20. In the inserted state, the bolt 42 is inserted into the insert hole 40 of the coupling block 8 provided in the rear of the backrest 6 of the chair, and the shaft of the bolt 42 is supported by the supporter ( When coupled to the nut 44 embedded in the end of the 30, both ends of the supporter 30 is connected to the back of the back of the chair (6). The bolt 42 and the nut 44 become a connector 40 for keeping both ends of the supporter 30 connected to the back of the chair back 6.

At this time, the head 42A of the bolt 42 is embedded in a head insert hole formed in the coupling block 8 of the backrest 6, and the bolt shaft 42B of the bolt 42 is the coupling block part. (8) It is embedded in the shaft insert hole inside. When there is an elastic receiving hole connected to the inner side of the coupling block 8 while being connected to the shaft insert hole inside the coupling block 8, the bolt shaft 42B of the bolt 42 is The elastic body receiving hole also penetrates and takes a structure fastened to the nut 44 embedded in the end of the supporter 30. On the other hand, the elastic body (EM) may be embedded in the elastic receiving hole. The elastic body EM may be configured as a spring. The elastic body EM is interposed between the coupling block portion 8 of the backrest 6 and the end of the supporter 30. At this time, the elastic body EM interposed between the coupling block portion 8 of the backrest 6 and the end of the supporter 30 may also be made of urethane coupled to the outer peripheral surface of the bolt shaft 42B of the bolt 42. As such, the elastic body EM may be adopted as long as it is an elastic member such as a spring or urethane.

On the other hand, the inner diameter of the head insert hole is larger than the outer diameter of the head 42A of the bolt 42, the inner diameter of the shaft insert hole is larger than the outer diameter of the bolt shaft 42B, the bolt 42 Space between the head 42A of the head and the head insert hole inside the coupling block 8 provided on the back of the back of the chair 6 is secured, and the bolt shaft 42B of the bolt 42 is engaged. Space between the shaft insert holes of the block portion 8 is also ensured.

The supporter 30 may be made of a material having elasticity in itself, such as an elastic plastic. In the present invention, the supporter 30 is composed of engineering plastics.

According to the present invention of the above configuration, when the user leans back on the seat plate 4 of the chair, the main back frame 20 is elastically tilted backwards and at the same time the supporter 30 also has a tilting action is elastically bent back.

Therefore, since the main backframe 20 acts as a tilting mechanism and the supporter 30 also acts as a tilting mechanism when the user tilts his back, the present invention has an effect of implementing a softer and more comfortable tilting function. When the user sits on the seat plate 4 and leans back, the main backframe 20 acts as a primary tilting mechanism while being elastically bent in a direction in which the main frame bar 24 is leaned backwards. In addition, the supporter 30 also bends elastically and acts as a secondary tilting mechanism, thereby enabling a more comfortable and softer tilting function than the conventional supporter 30. Existing chairs move with one tilting mechanism when the seat is leaned, but the chair of the present invention not only acts as a tilting mechanism of the main backframe 20, but also the supporter 30 is tilted once more. In this way, the backrest 6 has a tilting function that allows the backrest 6 to lean back more comfortably and smoothly with respect to the hinge part, that is, the hinge part connected to the backrest 6 so as to be rotatable. In other words, when the user sits on the seat plate 4 and tilts his back, the backrest 6 is tilted backward based on the hinge portion, and the tilting action of the main backframe 20 and the tilting action of the supporter 30 are prevented. It happens at the same time.

In addition, the supporter 30 in the present invention is configured to be rotated in the vertical direction based on the main back frame 20 and the backrest 6 when viewed from the side of the chair. The supporter 30 is hinged to the backrest 6, that is, both ends of the supporter 30 and the coupling block 8 of the backrest 6 are connected while the backrest 6 of the chair is turned back. All body shapes of the chair user since the tilting action is rotated in the vertical direction based on the portion connected via the 40 and at the same time the supporter 30 is rotated in the vertical direction based on the main back frame 20 According to the effect is more comfortable and soft tilting effect.

The bolt 42 and the nut 44 in the state in which the connecting insert piece 32 of the supporter 30 is inserted into the insert coupling groove 26A of the connecting back frame bar 26 which is the main part of the main back frame 20. It is connected to the connecting back frame bar 26 via a connector 40 made of a), and both ends of the supporter 30 is bolted to the coupling block portion 8 provided on the backrest 6 of the chair. And a connection portion consisting of a nut 44 and a connector, wherein the supporter 30 is connected to the coupling block portion 8 of the backrest 6 (ie, the supporter 30) while the backrest 6 is folded back. Since the bolt 42 and the nut 44 part are rolled on the basis of the coupling hole 40 of the coupling block 8, the supporter 30 is coupled to the left and right coupling blocks of the backrest 6. Up and down tilting operation (first point up and down tilting operation) which is rotated in the up and down direction based on (8) is made, and at the same time the connection of the supporter 30 Connector 40 (that is, the portion of the bolts 42 and nuts 44) and the connecting back frame bar 26 connecting the insert insert piece 32 to the connecting back frame bar 26 of the main back frame 20. Since the supporter 30 is rotated in the vertical direction based on the vertical tilting operation (the second point vertical tilting operation), the comfort and smooth tilting action is made in accordance with all body shapes of the chair user. . In other words, the primary tilting mechanism, the supporter 30, which is bent while the person sitting on the seat plate 4 leans back and the main back frame 20 is bent back elastically, also bends back elastically. Since the second tilting mechanism that is turned down and the third tilting mechanism, in which the supporter 30 is tilted up and down in a separate direction from the main back frame 20 and the backrest 6 simultaneously operate, perfectly fit all body types of the chair user. Comfortable and smooth tilting is possible. The supporter 30 is coupled to the bolt of the connector in the interior, the bolt is coupled to the nut embedded in the connecting backframe bar 26 of the main backframe 20, the outer peripheral surface and the supporter of the bolt The space between the bolt coupling holes of the 30 is secured at a predetermined interval, and the supporter 30 is connected to the back frame bar 26 based on the bolt due to the space between the bolt and the coupling portion of the supporter 30. Separately, the tilting action of rotating in the up and down direction (when the supporter 30 rotates in the up and down direction when viewed from the side of the chair) occurs. Therefore, the supporter 30 as well as the main back frame 20 is adapted to all body shapes of the chair user. Comfortable and soft tilting to fit all body shapes of the chair user means that the chair back is always comfortable and soft (6) regardless of whether the person sitting on the chair is relatively large, relatively small, skinny or relatively fat. It means you can roll it back.

In addition, the supporter 30 has a pair of left and right tilting support portions 30B extending to further enter the rear side of the backrest 6 when viewed from above, and the tilting support portion 30B has a backrest 6. It is connected to the left and right pair of coupling block portion 8 via the connector 40, the pair of left and right tilting support portion 30B is elastically bent backward when the backrest 6 is folded back. It is possible to induce a tilting operation of the backrest 6 which is even softer and more comfortable.

The main back frame 20 further includes a rear main back frame 20 connected to an upper end of a pair of left and right main frame bars 24, and the rear main back frame 20 is formed of the main back frame 20. When viewed from the side, it is arranged to be inclined at an angle from the rear of the back of the back 6 to the rear.

Therefore, when the backrest 6 of the chair is folded back, the rear main backframe 20 supports the backrest with a stronger force, so that the tilting of the backrest 6 is more secure. . Furthermore, the chair may be moved by holding the rear main back frame 20 by hand, and thus, the movement of the chair is more convenient.

In addition, a plurality of tilting guide grooves 34 are arranged side by side on the front of the pair of left and right tilting support portions 30B of the supporter 30 so that the backrest 6 is turned over when the backrest 6 is folded back. As the tilting support part 30B is bent back more smoothly by the tilting guide groove 34, the tilting action of the supporter 30 is made smoother and smoother. If the supporter 30 has a softer and more smooth tilting action by the tilting guide groove 34, the chair is more comfortable and soft when the seated person leans back and uses the chair more comfortably. To help.

On the other hand, in the present invention, the elastic body (EM) may apply an elastic force at the moment when the supporter 30 tilts when the backrest is tilted back, and the supporter 30 and the main backframe 20 may soften the tilting action. By performing a buffering action between the supporter 30 and the main backframe 20, there is an effect of extending the life of the connection portion between the supporter 30 and the main backframe 20.

In the above, the specific Example of this invention was described above. However, the spirit and scope of the present invention is not limited to these specific embodiments, and various changes and modifications can be made without departing from the spirit of the present invention. Those who have it will understand.

Therefore, since the embodiments described above are provided to completely inform the scope of the invention to those skilled in the art, it should be understood that they are exemplary in all respects and not limited. The invention is only defined by the scope of the claims.

2. Leg 4. Seat
6. Backrest 8. Joining block
20. Main backframe 22. Frame base
24. Main frame bar 24A. Reinforced connections
26. Connecting backframe bar 26A. Insert mating groove
28.Rear main backframe 30.Supporters
30A. Center Support Section 30B. Tilting Support
32. Connecting insert part 34. Tilting guide groove

Claims (5)

A main back frame 20 connected to the backrest 6 of the chair and disposed at the rear of the backrest 6;
And a supporter 30 connected to the main backframe 20 and the backrest 6,
The main backframe 20,
A frame base 22 connected to the bottom bracket provided on the seat plate 4 of the chair;
A pair of main frame bars 24 connected to a lower end of the frame base 22 and extending upwardly and connected to a rear portion of the backrest 6 via a hinge part;
And a connection back frame bar 26 connected to the pair of frame bars and arranged in a horizontal direction.
The supporter 30 has a bar shape extending in a horizontal direction, and a connection insert piece 32 is provided at a rear side thereof, and the connection insert piece 32 is formed at the connection back frame bar 26. 26A),
The supporter 30 and the main backframe 20 are configured to be connected to each other by a connector 40,
The supporter 30 is rotated in an up and down direction based on a portion of the coupling block 8 of the both ends and the backrest 6 connected through the connector 40 and at the same time the supporter 30 is connected to the main back frame ( 20) is configured to be a vertical tilt tilting action is rotated in the vertical direction,
With the bolt 42 and the nut 44 in the state in which the connecting insert piece 32 of the supporter 30 is inserted into the insert coupling groove 26A of the connecting back frame bar 26 of the main back frame 20. It is connected to the connecting back frame bar 26 via the connector 40, and both ends of the supporter 30 are bolted to the coupling block 8 provided on the back 6 of the chair. The connector 40 is connected via a connecting portion made of a nut 44 and the supporter 30 is connected to the coupling block 8 of the backrest 6 while the backrest 6 is turned back. Since the supporter 30 is rolled on the basis of the coupling hole 40 of the coupling block 8, the supporter 30 is tilted up and down based on both left and right coupling block portions 8 of the backrest 6. Operation is made, and at the same time, the connecting insert piece 32 of the supporter 30 is connected to the main back frame 20. Based on the connector 40 and the connecting back frame bar 26 connected to the frame bar 26, the supporter 30 is configured to perform a vertical tilting operation in which the supporter 30 is rotated in the vertical direction. chair.
delete The method of claim 1,
Both ends of the supporter 30 is a chair having improved backrest structure, characterized in that connected to the coupling block portion 8 provided on both sides of the back of the backrest (6) via a connector (40).
The method of claim 3,
The supporter 30 has a pair of left and right tilting support portions 30B extending to further enter the rear side of the backrest 6 when viewed from above, and the tilting support portion 30B is rearward of the backrest 6. The chair having improved backrest structure, characterized in that connected to the left and right pair of coupling block portion 8 via the connector 40 as a medium.
The method of claim 1,
The main backframe 20 further includes a rear main backframe 20 connected to an upper end of the pair of left and right mainframe bars 24, and the rear main backframe 20 includes the main backframe 20. Chair with improved back structure, which is arranged to be inclined at an angle from the rear of the back of the back 6 when viewed from the side.

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