JP6812201B2 - Chair - Google Patents

Description

The present invention relates to a chair preferably used in an office or the like.

Conventionally, various chairs having a backrest having a back plate have been known (see, for example, Patent Document 1).

The back plate in this type of chair is provided with a back plate main body located at the center and a back frame connected to the outer peripheral edge of the back plate main body. Slits or through holes are appropriately provided in the back plate main body, and the back frame is generally configured in a frame shape having a certain width dimension when viewed from the front.

Although the conventional back plate main body is provided with predetermined slits and through holes, it does not have a region-divided configuration so that the seated person can be suitably supported.

Japanese Unexamined Patent Publication No. 2011-024917

The present invention has been made in view of the above circumstances, and can provide a chair having a backrest that can be suitably supported by a seated person.

That is, the present invention has the following configuration.

The invention according to claim 1 is a chair provided with a backrest having a back plate, wherein the back plate is a lumbar region arranged at an intermediate position in the vertical direction substantially corresponding to a waist portion of a seated person. The upper region arranged above the lumbar region and the lower region arranged below the lumbar region are provided, and the rigidity of the lumbar region is higher than the rigidity of the upper region and the lower region. The upper region is set high , and the upper region includes a central region constituent portion arranged at an intermediate position in the vertical direction, an upper region constituent portion arranged on the central region constituent portion, and the central region configuration. It is a chair provided with a lower region constituent portion arranged under the portion, and the rigidity of the central region constituent portion is set lower than the rigidity of the upper region constituent portion and the lower region constituent portion. ..

The invention according to claim 2 comprises the back plate integrally formed of resin, and includes a back frame formed on a peripheral edge portion and a back plate main body arranged inside the back frame. The back frame has left and right side frame portions extending in the vertical direction, an upper frame portion that connects the upper end portions of the side frame portions, and a lower frame portion that connects the lower end portions of the left and right side frame portions. The waist region is mainly composed of a plurality of strip-shaped members provided between the left and right side frame portions and extending in the left-right direction, and the upper region is the upper frame portion and the upper frame portion. It is mainly composed of a plurality of strip-shaped members extending in the vertical direction provided between the upper end portion of the waist region, and the lower region is provided between the lower frame portion and the lower end portion of the waist region. The chair according to claim 1, which is mainly composed of a plurality of strip-shaped members extending in the vertical direction.

The invention according to claim 3 is the chair according to claim 2 , wherein the plurality of strip-shaped members are arranged side by side at regular intervals through slits.

According to the fourth aspect of the present invention, a plurality of strip-shaped members in the lumbar region are formed in a straight line and are arranged substantially horizontally in a front view, and adjacent strip-shaped members in the lumbar region are arranged with each other. The chair according to claim 2 or 3, which is partially connected via an upper and lower connecting piece.

The invention according to claim 5 is the chair according to claim 2, 3 or 4, wherein adjacent strip-shaped members in the upper region are partially connected to each other via a left and right connecting piece.

The invention according to claim 6 is that adjacent strip-shaped members in the upper region are partially connected to each other via left and right connecting pieces, and the left and right connecting pieces in the middle region constituent portion are used in the lateral direction. The chair according to claim 2, 3 , 4 or 5 , wherein the degree of connection to the chair is set lower than the degree of connection in the lateral direction by the left and right connecting pieces in the upper area constituent portion and the lower region constituent portion.

In the invention according to claim 7 , the plurality of strip-shaped members arranged in the middle portion in the left-right direction in the lower region are set to have a longer dimension than the plurality of strip-shaped members arranged in the left and right side portions in the lower region. The chair according to claim 2, 3 , 4 , 5 or 6.

The invention according to claim 8 is the chair according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the back plate is covered with a back plate cover.

The invention according to claim 9 is such that the back plate can be repositioned between a front position and a rear position with the upper end portion of the back plate as a rotation center, and the back plate is the front. Claim 1, 2, 3, 4, 5, 6, 7 or claim 1, 2, 3, 4, 5, 6, 7 or the part that can be independently related to the lumbar region of the seated person differs depending on whether the seat is located at the position or the rear position. It is the chair described in 8.

As described above, according to the present invention, it is possible to provide a chair having a backrest that can be suitably supported by a seated person.

The perspective view which shows one Embodiment of this invention. Front view in the same embodiment. The rear view in the same embodiment. Left side view in the same embodiment. Right side view in the same embodiment. The plan view in the same embodiment. Bottom view in the same embodiment. The front view of the backrest in the same embodiment. The left side view for explaining the operation of the positioning mechanism of the same embodiment. FIG. 5 is a schematic cross-sectional view taken along line XX in FIG. FIG. 8 is a schematic cross-sectional view taken along the line YY. FIG. 8 is a schematic cross-sectional view taken along the line ZZ in FIG. A partially enlarged view of the lower end portion in FIG. A partially enlarged view of the left end portion in FIG. An exploded perspective view of the backrest in the same embodiment. The exploded right side view of the backrest in the same embodiment. An exploded perspective view of the positioning mechanism in the same embodiment. The perspective view of the back plate and the like in the same embodiment. The front view of the back plate and the like in the same embodiment. Partially enlarged view in the same embodiment. Partially enlarged view in the same embodiment. The back view of the back plate and the like in the same embodiment. The right side view of the back plate and the like in the same embodiment. The plan view of the back plate in the same embodiment. The bottom view of the back plate and the like in the same embodiment. FIG. 19 is a sectional view taken along line VV in FIG. The perspective view of the back plate cover which partially broke in the same embodiment. The perspective view of the back plate cover which partially broke in the same embodiment. The rear view of the back plate cover and the like in the same embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 29.

In this embodiment, the present invention is applied to a chair A, which is an office swivel chair used in an office or the like.

The chair A has legs B, a support base C rotatably supported by the legs B, a seat D arranged on the support base C, and a back supported so as to be able to tilt backward with respect to the support base C. It is equipped with a leaning H.

Hereinafter, each configuration of the chair A will be described in detail.

<< Leg B >>
The leg B includes a plurality of leg blades b1 having casters b3 at the tip thereof, and leg columns b2 erected at the base end portion of the leg blades b1. The leg support b2 is configured to be expandable and contractible in the vertical direction, and supports the support base C so as to be vertically repositionable.

<< Support base C >>
The support base C is mainly composed of a metal block frame-shaped member connected to the upper end of the leg B. The support base C is provided with a main shaft j1 extending in the left-right direction, which is a rotation shaft of the backrest H.

A front link L1 arranged in pairs on the left and right is rotatably supported on the upper portion of the support base C. The front link L1 is in a forward leaning posture. The front end of the front link L1 is rotatably connected to the seat D, and the rear end of the front link L1 is rotatably supported with respect to the support base C.

<< Seat D >>
The seat D includes a shell-shaped seat support d1 made of synthetic resin, and a cushioning seat body d2 provided on the seat support d1 so that the front-rear position can be changed. The front portion of the seat D is supported by the support base C via the front link L1. The rear portion of the seat D is supported by the support base portion C via a back frame 1 which is formed of a backrest H and integrally provided with a rear link L2.

The seat D is configured to move in synchronization with the backward tilting motion of the backrest H by a so-called weight-sensing locking mechanism F. In the weight-sensing type locking mechanism F, in the initial state, the front link L1 and the rear link L2 are respectively tilted forward, and when the backrest H is tilted backward, the action of the front link L1 and the rear link L2 causes. The seat D is configured to be able to move backward and upward as a whole.

<< Backrest H >>
The backrest H is rotatably supported around the main shaft j1 of the support base C. The backrest H includes a back frame 1, a back plate 2 arranged on the front side of the back frame 1, and a back plate cover 4 which is a cover that covers substantially the entire back plate 2 which is a covered body and a plate-like body. , To position the decorative member E, which is a part of the back plate 2 not covered by the back plate cover 4, and the back plate 2 so as to be repositionable in the front-rear direction with respect to the back frame 1. It is provided with a positioning mechanism 6.

<Back frame 1>
The back frame 1 performs a backward tilting operation about a spindle j1 provided on the support base C. The back frame 1 is forward from the left and right side frame portions 1a extending in the vertical direction, the upper frame portion 1b erected between the upper end portions of the left and right side frame portions 1a, and the lower end portions of the left and right side frame portions 1a, respectively. The left and right lower frame portions 1c extending to the left and right, and the lower connecting portion 1d for connecting the left and right lower frame portions 1c to each other are provided. The left and right side frame portions 1a, the upper frame portion 1b, the left and right lower frame portions 1c, and the lower connecting portion 1d are integrally molded of synthetic resin.

The left and right side frame portions 1a each have the shape of a member that gradually widens downward. The left and right side frame portions 1a each have an abbreviated shape in side view and front view. The left and right side frame portions 1a are formed by connecting the upper frame portion 11 and the lower frame portion 13 via the bent portion 12. The upper frame portion 11 is tilted backward in side view, and the lower frame portion 13 is tilted forward in side view.

The upper frame portion 1b connects the upper end portions of the side frame portions 1a to each other. On the front surface of the upper frame portion 1b, a plurality of recessed portions 14 that open forward are provided at intervals in the left-right direction in order to attach the upper end portion of the back plate 2. The bottom surface of the upper frame portion 1b is provided with a bolt insertion hole (not shown) for inserting a bolt v1 that communicates with each other in each recess 14 from the outside. The rear surface of the upper frame portion 1b is formed flat.

The left and right lower frame portions 1c are connected to the left and right side frame portions 1a and extend in the front-rear direction. The left and right lower frame portions 1c are arranged at positions whose front portions correspond to the spindle j1 provided on the support base portion C. The left and right lower frame portions 1c extend to both sides of the support base portion C whose front end portions are arranged below the seat D. The left and right lower frame portions 1c are provided with recessed portions 15 that are open to the front side and inward and into which both ends of the main shaft j1 are inserted. The recessed portion 15 can be concealed by a concealing member 17. The left and right lower frame portions 1c have a curved shape so as to gradually rise rearward in a lateral view. The left and right lower frame portions 1c have an aspect of being tilted backward in a side view. The left and right lower frame portions 1c are provided with bearing projections 16 having shaft holes 161 constituting the positioning mechanism 6 on the upper surface side of the rear portion.

The lower connecting portion 1d in the back frame 1 is a plate-like one for rigidly connecting the left and right lower frame portions 1c to each other.

The side frame portion 1a and the lower frame portion 1c are integrally continuous so as to form an S shape in a side view. The lower frame portion 13 and the lower frame portion 1c of the side frame portion 1a have an abbreviated shape in a side view, and the side frame portion 1a and the lower frame portion 1c pass through a bent portion 18. It is continuous in one.

<Back plate 2>
The back plate 2 is integrally formed of synthetic resin, and includes a back frame K formed on the peripheral edge portion and a back plate main body M arranged inside the back frame K.

First, the back frame K will be described.

The back frame K includes left and right side frame portions 2a extending in the vertical direction, an upper frame portion 2b connecting the upper ends of the side frame portions 2a, and a lower frame portion 2c connecting the lower ends of the left and right side frame portions 2a. It is equipped with. That is, the back frame K includes the left and right side frame portions 2a, the upper frame portion 2b provided between the upper ends of the left and right side frame portions 2a, and the lower frame portion provided between the lower ends of the left and right side frame portions 2a. It is a frame-shaped structure mainly composed of 2c.

The left and right side frame portions 2a are formed by connecting the upper frame portion 21 tilted backward in the side view and the lower frame portion 23 tilted forward in the side view via the protruding portion 22 most protruding to the front side. ..

The left and right side frame portions 2a are provided with a recessed seam allowance portion ns that can dispose the left and right seam allowance portions 44 in the back plate cover 4 on the rear surface side of the outer edge. The seam allowance portion 44 is made of a fabric inevitably formed in the vicinity of the sewn joint portion by sewing one cover component 41 and the other cover component 42 in order to form the bag-shaped portion 4h. It is a surplus protruding part. The seam allowance portion arranging portion ns engages with the seam allowance portion 44 to stably position the back plate cover 4 on the back plate 2. That is, the seam allowance portion 44 formed on the inner surface side of the back plate cover 4 is positioned at the seam allowance portion arranging portion ns of the back plate 2, thereby suppressing the displacement movement of the back plate cover 4 with respect to the back plate 2. .. The seam allowance portion ns is continuously provided in the vertical direction on the back side of the outer edge of the upper frame portion 21 constituting the left and right side frame portions 2a and on the back side of the outer edge of the protruding portion 22. ..

Note that FIG. 29 is a schematic rear view mainly for explaining the positioning of the back plate cover 4 and the back plate 2. For convenience of explanation, only the back frame K is shown on the back plate 2, and the seam allowance portion 44 and the pushing member p2 are colored and displayed for the sake of clarity.

The lower frame portion 23 is formed so as to gradually deviate inward toward the bottom. The left and right lower frame portions 23 are arranged so as to form a so-called lower constriction mode in which the separation distance gradually decreases downward.

The lower frame portion 23 is provided with mounting grooves, that is, first and second mounting grooves mz1 and mz2, which can hold the free end on the opening side of the bag-shaped back plate cover 4. The lower frame portion 23 has a first mounting groove mz1 to which the mounting end edge 41e of one cover component 41 in the back plate cover 4 can be mounted, and a mounting end edge of the other cover component 42 in the back plate cover 4. It is provided with a second mounting groove mz2 to which the 42e can be mounted. The first and second mounting grooves mz1 and mz2 are mainly composed of bottomed groove-shaped portions, and extend in the vertical direction along the edge of the lower frame portion 23, respectively, to the outside. It is open. The first and second mounting grooves mz1 and mz2 are arranged adjacent to each other in the front-rear direction. That is, the first mounting groove mz1 is arranged adjacent to the second mounting groove mz2 substantially in parallel.

Above the first and second mounting grooves mz1 and mz2 in the lower frame portion 23, that is, above the upper ends of the respective mounting grooves mz1 and mz2 in the side view, the seam allowance portion formed in the protruding portion 22 is arranged. A communication passage rt capable of spatially communicating the portion ns and the first and second mounting grooves mz1 and mz2 is provided. The communication passage rt has a groove shape that is open to the outside, that is, to the left and right.

Under the first and second mounting grooves mz1 and mz2 in the lower frame portion 23, bearing protrusions 24 (L) and 24 (R), which are protrusions having shaft holes 241 constituting the positioning mechanism 6, are on the front side. It is projected in pairs on the left and right toward. More specifically, the back plate 2 is a left bearing protrusion which is a pair of left and right protruding portions for rotatably connecting the left and right links 6a and 6b constituting the positioning mechanism 6 which is another member. It includes 24 (L) and a right bearing protrusion 24 (R) which is a right protruding portion.

The left and right bearing protrusions 24 (L) and 24 (R) of the back plate 2 and their vicinity are exposed portions 26 which are not covered by the back plate cover 4. The decorative member E to be exteriorized on the exposed portion 26 will be described in detail later.

The upper frame portion 2b is integrally erected between the upper ends of the left and right side frame portions 2a, and has a curved shape so as to project rearward in a plan view. The size of the upper frame portion 2b in the front-rear direction is set shorter than the size in the vertical direction in cross-sectional view. A curved connecting portion w is arranged in front of the upper frame portion 2b.

The upper frame portion 2b of the back plate 2 is connected to the upper end portion of the back frame 1. That is, the upper frame portion 2b is provided with a fitting projection 25 on the back surface which can be fitted into the recessed portion 14 of the back frame 1. The fitting protrusion 25 is projected rearward. The fitting projection 25 is provided with a screw hole h1 into which a bolt v1 is screwed. The fitting protrusion 25 of the upper frame portion 2b is internally fitted into the recessed portion 14 of the back frame 1, and then the bolt v1 inserted from the lower side is screwed into the screw hole h1 to screw the upper end of the back plate 2. The upper frame portion 2b, which is a portion, is fixed to the upper frame portion 1b, which is the upper end portion of the back frame 1.

The lower frame portion 2c is erected between the lower ends of the left and right side frame portions 2a. The lower frame portion 2c has a first mounting groove mz1 to which the mounting end edge 41e of one cover component 41 in the back plate cover 4 can be mounted, and a mounting end edge 42e of the other cover component 42 in the back plate cover 4. It is provided with a second mounting groove mz2 to which the above can be mounted. The first and second mounting grooves mz1 and mz2 extend in the left-right direction along the edge of the lower frame portion 2c, and are opened downward, respectively. The first and second mounting grooves mz1 and mz2 are arranged adjacent to each other in the front-rear direction. That is, the first mounting groove mz1 is arranged adjacent to the second mounting groove mz2 substantially in parallel.

In this embodiment, the first and second mounting grooves mz1 and mz2 provided in the lower portion of the back plate 2 are interposed by the left bearing protrusion 24 (L) and the right bearing protrusion 24 (R), respectively. It has a structure that is separated into three parts: the middle, the left side, and the right side. That is, the first and second mounting grooves mz1 and mz2 of the back plate 2 are intermediate mountings provided between the left bearing protrusion 24 (L) and the right bearing protrusion 24 (R) in the lower frame portion 2c. Grooves mz1 (C) and mz2 (C), left mounting grooves mz1 (L) and mz2 (L) provided in the side frame portion 2a located to the left of the left bearing protrusion 24 (L), and the right It is provided with right side mounting grooves mz1 (R) and mz2 (R) provided in the side frame portion 2a located to the right of the bearing projection 24 (R).

Next, the back plate main body M will be described.

The back plate main body M is arranged inside the back frame K. The back plate body M has a lumbar region m1 arranged at an intermediate position in the vertical direction substantially corresponding to the lumbar region of the seated person, an upper region m2 arranged above the lumbar region m1, and below the lumbar region m1. It has an arranged lower region m3. The rigidity of the lumbar region m1 is set higher than the rigidity of the upper region m2 and the lower region m3. In other words, the upper region m2 and the lower region m3 are set to be more easily elastically deformed than the lumbar region m1.

The lumbar region m1 is mainly composed of a plurality of strip-shaped members m11 provided between the left and right side frame portions 2a and extending in the left-right direction. More specifically, the plurality of strip-shaped members m11 are arranged so as to connect the lower ends of the upper frame portions 21 in the left and right side frame portions 2a. The plurality of strip-shaped members m11 in the lumbar region m1 are arranged side by side at regular intervals in the vertical direction at regular intervals via slits m13. In this embodiment, the lumbar region m1 is composed of five strip-shaped members m11 that extend linearly in the left-right direction in the front view and are arranged in the vertical direction so as to be parallel to each other. The strip-shaped member m11 has a substantially rectangular shape in cross-sectional view. The adjacent strip-shaped members m11 in the lumbar region m1 are partially connected to each other via the upper and lower connecting pieces m12. The strip-shaped member m11 is set to have substantially the same width dimension between the left and right side frame portions 2a. The width dimension of the slit m13 formed between the adjacent strip-shaped members m11 and the width dimension of the strip-shaped member m11 in the lumbar region m1 are set to be substantially the same.

The upper region m2 is mainly composed of a plurality of strip-shaped members m21 extending in the vertical direction provided between the upper frame portion 2b and the upper end portion of the lumbar region m1, that is, the strip-shaped member m11 constituting the lumbar region m1 arranged on the uppermost side. It is configured in. More specifically, the upper region m2 is located between the plurality of strip-shaped members m21 extending in the vertical direction in the front view, the plurality of strip-shaped members m21, and the upper frame portion 2b, and is above each strip-shaped member m21. It is provided with a curved connecting portion w which is a plurality of connecting portions which are connected to each other.

The plurality of strip-shaped members m21 constituting the upper region m2 extend in the vertical direction, and are arranged side by side at regular intervals in the left-right direction via the slits m23. The strip-shaped member m21 is set to have substantially the same width dimension from the upper end portion connected to the curved connecting portion w to the lower end portion connected to the strip-shaped member m11 in the lumbar region m1. The plurality of strip-shaped members m21 have a substantially rectangular shape in a cross-sectional view.

The upper region m2 is arranged below the central region constituent portion r1 arranged at an intermediate position in the vertical direction, the upper region constituent portion r2 arranged on the central region constituent portion r1, and the central region constituent portion r1. It includes a lower region constituent portion r3. The rigidity of the central region constituent portion r1 is set lower than the rigidity of the upper region constituent portion r2 and the lower region constituent portion r3. That is, the adjacent strip-shaped members m21 in the upper region m2 are partially connected to each other via the left and right connecting pieces m22. Then, the degree of lateral connection by the left and right connecting pieces m22 in the central region constituent portion r1 is set lower than the degree of lateral connection by the left and right connecting pieces m22 in the upper region constituent portion r2 and the lower region constituent portion r3. Has been done.

Specifically, in the central region constituent portion r1, only two adjacent strip-shaped members m21 are connected to each other via the left-right connecting piece m22 on the virtual straight line s1 extending in the left-right direction. The upper region constituent portion r2 includes a portion r21 in which three adjacent strip-shaped members m21 are continuously connected to each other via a left-right connecting piece m22 on a virtual straight line s2 extending in the left-right direction. The lower region constituent portion r3 includes a portion r31 in which three adjacent strip-shaped members m21 are continuously connected to each other via a left-right connecting piece m22 on a virtual straight line s3 extending in the left-right direction. That is, in this embodiment, the degree of connection in the lateral direction is set according to the number of connected strip-shaped members m21 on the virtual straight lines s1, s2, and s3 by the left and right connecting pieces m22.

The curved connecting portion w provided in the upper region m2 forms a strip-shaped thin plate interposed between the plurality of strip-shaped members m21 extending in the vertical direction and the upper frame portion 2b in the front view. In this embodiment, the curved connection portion w has a shape curved so as to form a convex shape toward the front, more specifically, the front and the upper side. A plurality of curved connecting portions w are provided corresponding to each band-shaped member m21. The thickness dimension of the curved connecting portion w is set to be the same as the thickness dimension of the strip-shaped member m21. The curved connecting portion w has a thin plate shape, and the trailing edge is connected only to the upper end portion of the upper frame portion 2b. The upper end of the curved connecting portion w located in front of the upper frame portion 2b is arranged at a position higher than the upper end of the upper frame portion 2b. The curved connection portion w is set to have substantially the same width dimension from the front end portion connected to the band-shaped member m21 to the rear end portion connected to the upper frame portion 2b. The plurality of curved connection portions w have a substantially rectangular shape in a cross-sectional view. The curved connection portion w is located above the lower end edge n1 of the upper frame portion 2b in the front view.

In the back plate 2, the width dimension w1 of the slits ws formed between the adjacent curved connecting portions w is set shorter than the width dimension w2 of the slits m23 formed between the adjacent strip-shaped members m21. More specifically, the width dimension w1 of the slit ws formed between the adjacent curved connecting portions w is set to about one-third of the width dimension w2 of the slit m23 formed between the adjacent strip-shaped members m21. Has been done. The width dimension w4 of the strip-shaped member m21 in the upper region m2 is set shorter than the width dimension w3 of the curved connecting portion w. The width dimension w2 of the slit m23 formed between the adjacent strip-shaped members m21 and the width dimension w4 of the strip-shaped member m21 in the upper region m2 are set to be substantially the same.

The curved connection portion w is formed so that its front surface forms a flat curved surface. That is, the outer surface of the front surface of the curved connecting portion w is smoothly formed so that there is no uneven shape. The outer surface of the curved connecting portion w and the outer surface of the strip-shaped member m21 are set to be flush with each other. By doing so, the back plate cover 4 that covers the curved connection portion w and is backed and supported by the curved connection portion w is less likely to have an uneven shape due to the outer surface shape of the curved connection portion w. It has become.

The lower region m3 includes a plurality of strip-shaped members m31 extending in the vertical direction provided between the lower frame portion 2c and the lower end portion of the lumbar region m1, that is, the strip-shaped member m11 constituting the lumbar region m1 arranged on the lowermost side. It is composed mainly of. The plurality of strip-shaped members m31 are arranged side by side in the left-right direction at regular intervals with the slit m33 interposed therebetween. The band-shaped member m31 is set to have substantially the same width dimension from the upper end portion connected to the band-shaped member m11 in the lumbar region m1 to the lower end portion connected to the lower frame portion 2c. The plurality of strip-shaped members m31 have a substantially rectangular shape in a cross-sectional view. The plurality of strip-shaped members m31 arranged in the middle portion in the left-right direction in the lower region m3 are set to have a longer dimension than the plurality of strip-shaped members m31 arranged in the left and right side portions in the lower region m3. The width dimension of the slit m33 formed between the adjacent strip-shaped members m31 and the width dimension of the strip-shaped member m31 in the lower region m3 are set to be substantially the same.

The back plate 2 includes an exposed portion 26 that is not covered by the back plate cover 4 described above. In this embodiment, the exposed portion 26 has a bearing protrusion 24 which is a connection end portion of the back plate 2 which is a covered body for rotatably connecting the exposed portion 26 to the left and right links 6a and 6b which are other separate members. It is composed of the surrounding parts. In other words, the exposed portion 26 includes a bearing projection 24 which is a protruding portion projecting from the back plate 2.

In this embodiment, the thickness dimensions of the strip-shaped member m21 in the upper region m2, the strip-shaped member m31 in the lower region m3, and the vertical connecting piece m12 in the lumbar region m1 are set to be substantially the same. Further, the thickness dimensions of the strip-shaped member m11 in the lumbar region m1 and the left and right connecting pieces m22 in the upper region m2 are set to be substantially the same.

The thickness dimensions of the strip-shaped member m11 in the lumbar region m1 and the left and right connecting pieces m22 in the upper region m2 are such that the strip-shaped member m21 in the upper region m2, the strip-shaped member m31 in the lower region m3, and the vertical connection of the lumbar region m1. It is set to be thicker than each thickness dimension of one piece m12.

In the back plate main body M of the back plate 2 configured in this way, the band-shaped member m11 in the lumbar region m1 has a relatively thick wall, so that the lumbar portion of the seated person can be strongly supported. Further, since the left and right connecting pieces m22 in the upper region m2 of the back plate 2 have a relatively thick wall, the back plate main body M can suitably withstand the stress concentrated on the connecting portion.

The back plate 2 described above is provided with a decorative member E that covers the exposed portion 26 that is not covered by the back plate cover E.

<Cosmetic member E>
The decorative member E is separate from the back plate 2. The decorative member E is integrally formed of a synthetic resin. The decorative member E can impart appearance characteristics different from the appearance characteristics of the exposed portion 26. For convenience of explanation, the decorative member E is colored and displayed in the drawing. That is, by imparting a so-called spot-like appearance characteristic to a part of the entire chair A by using the decorative member E, it is possible to give a suitable visual impression to the user. The appearance characteristic of the decorative member E in this embodiment is color. That is, the decorative member E has a color different from that of the back plate 2. The decorative member E can show the user a color different from that of the back plate 2 by covering the exposed portion 26 where the color of the back plate 2 can be expressed. As an example, when the back plate 2 is made of a white synthetic resin, the decorative member E can be set to have a color other than white (for example, black). As for the color of the decorative member E, it goes without saying that an appropriate color including a pattern can be provided. Other appearance characteristics include a texture that can be exhibited depending on the surface shape and material (for example, metal).

The decorative member E includes a decorative member main body e1 having a concave shape that can be fitted outward to the bearing protrusions 24, which are protruding portions on the left and right, and a flange portion e2 provided on the peripheral edge of the decorative member main body e1. The decorative member main body e1 has a shaft insertion hole e11 communicating in the left-right direction corresponding to the shaft hole 241 of the bearing projection 24.

The flange portion e2 can be fitted into the recessed portion 2h formed in the peripheral region of the bearing projection 24 of the back plate 2. The collar portion e2 includes a positioning convex portion e21 that is internally fitted in the positioning recess 2i provided on the back plate 2, and first and second mounting grooves mz1 (L), mz1 (R), mz2 (L), and mz2 ( It is provided with a notch e22 provided at a position corresponding to R). The concave edge provided at the lower left and right corners of the back plate cover 4, that is, the exposed portion forming edge 411 of one of the cover components 41 is inside the outer edge of the collar e2, that is, the makeup. It is set so that it can be located on the member body e1 side.

Subsequently, the back plate cover 4 will be described.

<Back cover 4>
The back plate cover 4 is mainly composed of a cloth or the like. The back plate cover 4 is mainly composed of one cover component 41 that can cover the front surface side of the back plate 2 and a cloth or the like, and the rear surface side of the back plate 2 that is the other surface side. It has the other cover component 42 that can be covered. An inner cushion 43 made of a sheet-shaped foam is disposed on the back surface of one of the cover components 41 located on the front side of the back plate 2. The back plate cover 4 in this embodiment does not adopt a configuration in which the cover components separated from each other are connected by using a connecting tool such as a fastener or a connecting button. That is, the back plate cover 4 is configured to cover substantially the entire back plate 2 without using a connecting tool.

The back plate cover 4 is formed by partially sewing the side and upper peripheral edges of one cover component 41 and the side and upper peripheral edges of 42 to the other cover component. It is provided with a bag-shaped portion 4h that can be opened toward. A plate member having a communication hole 45a at which the fitting projection 25 of the back plate 2 can project outward from the back plate cover 4 on the upper back side portion of the back plate cover 4 which is a part of the bag-shaped portion 4h. 45 is attached.

The mounting end edges 41e (C), 41e (L), and 41e (R) of one of the cover components 41 of the back plate cover 4 include a band-shaped pushing member p1 formed of a synthetic resin. The pushing member p1 is sewn to the fabric constituting one of the cover components 41.

The mounting edge 42e (C), 42e (L), 42 (R) of the other cover component 42 of the back plate cover 4 includes a band-shaped pushing member p2 formed of synthetic resin. The push-in member p2 of the mounting end edges 42e (C), 42e (L), and 42 (R) of the other cover component 42 has an L-shaped cross section. The pushing member p2 of the other cover component 42 has an inner piece to be inserted p21 inserted into the back of the second mounting groove mz2 and an opening side of the first mounting groove mz1 from the outer edge of the inner piece to be inserted p21. It is provided with an extension outer piece p22 extending toward. The inserted inner piece p21 of the pushing member p2 is sewn to the fabric constituting the other cover component 42.

A part of the fabric constituting the other cover component 42 is pushed by the tip edge of the extending outer piece portion p22 of the pushing member p2 and is positioned close to the first mounting groove mz1. That is, by using the push-in member p2 having an L-shaped cross section, the mounting end edge 42e of the other cover component 42 can be suitably mounted in the second mounting groove mz2, and the mounting in one cover component 41 can be mounted. The appearance is spoiled between the edge 41e (C), 41e (L), 41 (R), and the mounting edge 42e (C), 42e (L), 42 (R) of the other cover component 42. Since it is difficult to form such a gap, a suitable appearance can be formed.

<Positioning mechanism 6>
The positioning mechanism 6 can select and position the back plate 2 at either the front position (f) or the rear position (r). That is, the back plate 2 is configured to be repositionable between the front position (f) and the rear position (r) with the upper end portion of the back plate 2 as the center of rotation by the positioning mechanism 6.

In this embodiment, the portion of the back plate 2 that can be independently associated with the seated person's waist differs depending on whether the back plate 2 is located at the front position (f) or the rear position (r). .. That is, when the back plate 2 is in the front position (f), the lower part of the lumbar region m1 in the back plate main body M can be independently involved with the waist of the seated person, and the back plate 2 can be engaged. When it is in the rear position (r), the portion above the lower part of the lumbar region m1 in the back plate main body M can be independently involved with the lumbar portion of the seated person.

The positioning mechanism 6 is configured so that it can be stably positioned at either the front position (f) or the rear position (r) by utilizing the elastic deformation of the back plate 2.

The positioning mechanism 6 includes left and right links 6a and 6b arranged in pairs on the left and right, which are pivotally supported so as to be able to rotate in the front-rear direction with respect to the back frame 1.

The positioning mechanism 6 is provided between the rearward tilted portion in the side view at the lower part of the back frame 1 and the lower end portion of the back plate 2.

The positioning mechanism 6 rotatably connects the left and right links 6a and 6b supported by the bearing protrusions 16 of the back frame 1 and the rotating ends of the left and right links 6a and 6b to the bearing protrusions 24 of the back plate 2. It includes a tip shaft sj and an operating lever 6c for directly rotating the left link 6a, which is one of the links. The left and right links 6a and 6b are set so that they can rotate only between the front position (a) inclined forward and the rear position (c) inclined backward.

The left link 6a (left side in front view) rotates in the front-rear direction by an operating force applied to the operating lever 6c, and includes an inner link member 61 and an outer link member 62.

The lower portion of the inner link member 61 is attached to the inner surface of the bearing protrusion 16 on the back frame 1, and the upper portion thereof is attached to the inner surface of the bearing protrusion 24 on the back plate 2. The inner link member 61 integrally integrates a base end shaft kj inserted into the shaft hole 161 of the bearing protrusion 16 in the back frame 1 and a tip shaft sj inserted into the shaft hole 241 of the bearing protrusion 24 in the back plate 2. I have. A bolt insertion hole h2 through which the bolt v2 can be inserted is formed at an intermediate position of the inner link member 61.

The lower portion of the outer link member 62 is in contact with the outer surface of the bearing protrusion 16 in the back frame 1, and the upper portion thereof is in contact with the outer surface of the bearing protrusion 24 in the back plate 2. It includes a base end side fitting hole (not shown) into which the ends are fitted, and a tip end side fitting hole 622 into which the through end of the tip shaft sj is fitted. At an intermediate position of the outer link member 62, a spacer protrusion 63 is provided to keep the distance between the outer link member 62 and the inner link member 61 constant. The spacer protrusion 63 is provided with a portion where the bolt v2 inserted through the bolt insertion hole h2 is screwed. That is, the inner link member 61 and the outer link member 62 are connected via the bolt v2.

The front end edge or the rear end edge of the spacer protrusion 63 can come into contact with the front surface or the rear surface of the bearing protrusion 16 in the back frame 1, and the left link 6a is located from the front position (a) to the rear position ( It has a function of restricting the rotation range so that it can rotate only up to c).

On the outer surface of the proximal end portion of the outer link member 62, a prismatic boss portion 64 is provided so as to align the axial center with the axial center of the proximal end side fitting hole 621. The base end portion of the operating lever 6c is fitted to the boss portion 64, and is prevented from coming off from the boss portion h7 by a bolt v7. A ring member 6d is interposed between the peripheral edge of the base end portion of the operating lever 6c and the outer link member 62. The operating lever 6c connected to the outer link member 62 can rotate integrally with the outer link member 62.

The right link 6b (right side in front view) has a configuration similar to that of the left link 6a described above, and the corresponding configurations are designated by the same reference numerals and the description thereof will be omitted. The link 6b on the right differs from the link 6a on the left in that the outer link member 62 is not provided with an operation lever. Needless to say, the link 6b on the right may be provided with an operation lever in the same manner as the link 6a on the left.

As described above, the chair A according to the present embodiment includes a backrest H having a back plate 2. The back plate 2 includes a back frame K formed on the peripheral edge portion and a back plate main body M arranged inside the back frame K. The back plate body M is arranged below the lumbar region, with the lumbar region m1 arranged at an intermediate position in the vertical direction substantially corresponding to the lumbar region of the seated person, the upper region m2 arranged above the lumbar region m1. The lower region m3 is provided, and the rigidity of the lumbar region m1 is set higher than the rigidity of the upper region m2 and the lower region m3. Therefore, it is possible to provide a backrest H provided with a back plate 2 that can be suitably supported by the seated person.

That is, the back plate 2 is divided into a lumbar region m1, an upper region m2, and a lower region m3, and the rigidity of the lumbar region m1 is increased in the upper region m2 and the lower region m3. It is different from the rigidity. For this reason, it is possible to provide a back plate 2 that can suitably support the waist portion of the seated person and can impart a soft leaning feeling to a portion other than the waist portion of the seated person by a constant elastic deformation force. It has become.

The upper region m2 is arranged below the middle region constituent portion r1 arranged at the intermediate position in the vertical direction, the upper region constituent portion r2 arranged on the middle region constituent portion r1, and the intermediate region constituent portion r1. It is provided with a lower region constituent portion r3. The rigidity of the central region constituent portion r1 is set lower than the rigidity of the upper region constituent portion r2 and the lower region constituent portion r3. Therefore, the upper region m2 is divided into a middle region constituent portion r1, an upper region constituent portion r2, and a lower region constituent portion r3, and moreover, the upper and lower parts above the waist of the seated person. Since the intermediate portion in the direction is configured to be most easily elastically deformed, it can be suitably elastically deformed corresponding to the seated person.

The back frame 2 includes left and right side frame portions 2a extending in the vertical direction, an upper frame portion 2b connecting the upper ends of the side frame portions 2a, and a lower frame portion 2c connecting the lower ends of the left and right side frame portions 2a. It has. The lumbar region m1 is mainly composed of a plurality of strip-shaped members m11 provided between the left and right side frame portions 2a and extending in the left-right direction. The upper region m2 is mainly composed of a plurality of strip-shaped members m11 extending in the vertical direction provided between the upper frame portion 2b and the upper end portion of the lumbar region m1. The lower region m3 is mainly composed of a plurality of strip-shaped members m31 extending in the vertical direction provided between the lower frame portion 2c and the lower end portion of the lumbar region m1.

Therefore, the lumbar region m1 has a structure in which elastic deformation is easily suppressed by the band-shaped member m11 which adopts a connecting mode connecting the left and right side frames 2a.

Further, the upper region m2 and the lower region m3 are mainly composed of strip-shaped members m21 and m31 extending in the vertical direction, and have a structure that is relatively easy to cause elastic deformation. The lower end of the strip-shaped member m21 in the upper region m2 and the upper end of the strip-shaped member m31 in the lower region m3 are connected to the lumbar region m1, respectively. Therefore, the lumbar region 1 and the back frame K cooperate to stably support the band-shaped members m21 and m31.

A plurality of band-shaped members, that is, band-shaped members m11 in the waist region m1 are arranged vertically at regular intervals via a slit m13, and band-shaped members m21 in the upper region m2 are arranged at regular intervals via a slit m23. The strip-shaped members m31 in the lower region m3 are arranged side by side at regular intervals through the slit m33 in the left-right direction. Therefore, since the band-shaped members m11, m21, and m31 can move in the slit m13, m23, and m33 directions in response to the load of the seated person, they have suitable elasticity that can follow the movement of the seated person. It can be transformed.

A plurality of strip-shaped members m11, m21, and m31 have a substantially rectangular shape in a cross-sectional view. Therefore, it is difficult to cut and can be preferably elastically deformed.

A plurality of strip-shaped members m11 in the lumbar region m1 have a linear shape and are arranged substantially horizontally in a front view. For this reason, it is easy to exhibit rigidity that can favorably support the waist portion of the seated person.

Adjacent strip-shaped members m11 in the lumbar region m1 are partially connected to each other via a vertical connecting piece m12. Therefore, the movement of the strip-shaped member 11 in the vertical direction can be restricted, and excessive elastic deformation is suppressed, so that a constant rigidity can be easily set in the lumbar region m1.

Adjacent strip-shaped members m21 in the upper region m2 are partially connected to each other via a left and right connecting piece m22. Therefore, the upper region m2 has an excellent degree of freedom in design for realizing a mode in which elastic deformation is allowed and rigidity is ensured.

The adjacent strip-shaped members m21 in the upper region m2 are partially connected to each other via the left and right connecting pieces m22, and the degree of lateral connection by the left and right connecting pieces m22 in the middle region constituent portion r1 is higher. It is set lower than the degree of lateral connection by the left and right connection pieces m22 in the area constituent unit r2 and the lower region constituent portion r3. Therefore, the upper region m2 is divided into a central region constituent portion r1, an upper region constituent portion r2, and a lower region constituent portion r3, and the central region constituent portion r1 is divided into an upper region constituent portion r2 and a lower region constituent portion r2. It has a structure that is more easily elastically deformed than the portion r3.

The plurality of strip-shaped members m31 arranged in the middle portion in the left-right direction in the lower region m3 are set to have a longer dimension than the plurality of strip-shaped members m31 arranged in the left and right side portions in the lower region m3. Therefore, the intermediate portion in the left-right direction in the lower region m3 is more easily elastically deformed than the left and right side portions.

The back plate 2 is covered with a back plate cover 4. Therefore, it is possible to give the seated person a certain cushioning property by the back plate cover 4.

The position of the back plate 2 can be changed between the front position (f) and the rear position (r) with the upper end portion of the back plate 2 as the center of rotation. The portion of the back plate 2 that can be independently associated with the waist of the seated person differs depending on whether the back plate 2 is located at the front position (f) or the rear position (r). Therefore, by setting the back plate 2 to either the front position (f) or the rear position (r), it is possible to provide the seated person with a different feeling of support for the lumbar region. There is.

The present invention is not limited to the embodiments described in detail above.

The configurations of the lumbar region, the upper region, and the lower region can be variously set, and are not limited to those shown in the above-described embodiment.

The band-shaped member applied to the lumbar region is not necessarily limited to the one extending in the horizontal direction, and may be inclined with respect to the horizontal direction as long as it extends in the left-right direction.

The strip-shaped member applied to the upper region is not necessarily limited to the one extending in the vertical direction, and may be inclined with respect to the vertical direction as long as it extends in the vertical direction.

The band-shaped member applied to the lumbar region is not necessarily limited to the one extending in the vertical direction, and may be inclined with respect to the vertical direction as long as it extends in the vertical direction.

The rigidity of the lumbar region, the upper region, and the lower region can be set by various aspects. For example, it can be realized by changing the number of connections between the strip-shaped member and the connecting piece as described above. Further, it may be set by changing the thickness dimension of the strip-shaped member or the connecting piece.

The degree of connection by the connecting piece can be set in various forms. For example, the degree of connection increases by increasing the number of connected strip-shaped members adjacent to each other on the virtual straight line.

The back plate cover is not always an essential configuration. That is, the chair of the present invention can be used without the back plate cover attached.

Of course, a headrest for supporting the seated person's head from the rear side may be attached to the backrest.

Of course, the seat and backrest may be equipped with armrests to support the seated person's elbows and arms from below.

In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

2 ... Back plate A ... Chair H ... Back leaning K ... Back frame M ... Back plate body m1 ... Lumbar area m2 ... Upper area m3 ... Lower area

Claims (9)

A chair with a backrest and a back plate.
The back plate is arranged in a lumbar region arranged at an intermediate position in the vertical direction substantially corresponding to the lumbar region of the seated person, an upper region arranged above the lumbar region, and below the lumbar region. It has a lower area and
The rigidity of the lumbar region is set higher than the rigidity of the upper region and the lower region .
The upper region includes a central region constituent portion arranged at an intermediate position in the vertical direction, an upper region constituent portion arranged above the central region constituent portion, and a lower region arranged below the central region constituent portion. It has a component and
A chair in which the rigidity of the central region constituent portion is set lower than the rigidity of the upper region constituent portion and the lower region constituent portion . The back plate is integrally formed of resin, and includes a back frame formed on a peripheral edge portion and a back plate main body arranged inside the back frame.
The back frame includes left and right side frame portions extending in the vertical direction, an upper frame portion connecting between the upper end portions of the side frame portions, and a lower frame portion connecting between the lower end portions of the left and right side frame portions. Is a thing
The lumbar region is mainly composed of a plurality of strip-shaped members provided between the left and right side frame portions and extending in the left-right direction.
The upper region is mainly composed of a plurality of strip-shaped members extending in the vertical direction provided between the upper frame portion and the upper end portion of the lumbar region.
The chair according to claim 1, wherein the lower region is mainly composed of a plurality of strip-shaped members extending in the vertical direction provided between the lower frame portion and the lower end portion of the waist region. The chair according to claim 2 , wherein the plurality of strip-shaped members are arranged side by side at regular intervals via slits. A plurality of strip-shaped members in the lumbar region are linear and arranged substantially horizontally in a front view, and adjacent strip-shaped members in the lumbar region are partially connected to each other via an upper and lower connecting piece. The chair according to claim 2 or 3 which is connected. The chair according to claim 2, 3 or 4 , wherein adjacent strip-shaped members in the upper region are partially connected to each other via a left and right connecting piece. Adjacent strip-shaped members in the upper region are partially connected via left and right connecting pieces.
A claim in which the degree of lateral connection by the left and right connecting pieces in the central region constituent portion is set lower than the degree of lateral connection by the left and right connecting pieces in the upper region constituent portion and the lower region constituent portion. The chair according to 2, 3 , 4 or 5. Claims 2, 3, the plurality of strip-shaped members arranged in the middle portion in the left-right direction in the lower region are set to have a longer dimension than the plurality of strip-shaped members arranged in the left and right side portions in the lower region. The chair according to 4, 5 or 6. The chair according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the back plate is covered with a back plate cover. The position of the back plate can be changed between the front position and the rear position with the upper end of the back plate as the center of rotation.
Claims 1, 2, 3, 4 that the part that can independently relate to the waist of the seated person differs depending on whether the back plate is located at the front position or the rear position. 5, 6, 7 or 8 chair.

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