WO2015108143A1 - Backing board structure for chair load-supporting member - Google Patents

Abstract

In the backing board structure for a load-supporting member (6) in which elastic deformation in the direction of the surface of the back rest backing board (21) is promoted by providing the back rest backing board (21) with a formed opening area (86) in which multiple openings (87) that penetrate from the front surface to the back surface of the board are formed in a regular pattern, bridges (95) that span between opposite ends of the openings (87) are provided only in a specified area of the formed opening area (86) and the bridges (95) are provided with bend-promoting sections (97), which extend between opposite ends and at least a portion of which is curved or bent with respect to the center line (k3) of the opening.

Description

Board structure of chair load support member

The present invention relates to a board structure for a load support member of a chair.
This application claims priority based on Japanese Patent Application Nos. 2014-006924 and 2014-006925 filed in Japan on January 17, 2014, the contents of which are incorporated herein by reference.

As a substrate structure belonging to the above technical field, for example, a substrate structure disclosed in Patent Documents 1-3 below is known.
The substrate structure disclosed in these documents is a load supporting member that supports the load received from the user's body in the chair, and penetrates from the front surface to the back surface of the substrate of the receiving surface component that receives the load in contact with the user. There are a structure in which a large number of openings are formed, or a grid structure composed of a plurality of filaments. The substrate is excellent in that a soft seating feeling can be obtained because it easily spreads in the surface direction by receiving a load acting in the direction perpendicular to the surface.

Moreover, the board | substrate structure disclosed by patent document 1 is laterally long by the front view by making the backrest (load support member) of a chair tolerate two or more linear bodies which incline rightward or leftward in frontal view. It is configured as a plate body in which a plurality of rhombus openings are formed.
In the substrate structure disclosed in Patent Document 2, the backrest of the chair is provided with a plurality of linear bodies extending in the vertical direction, and the connecting portions that connect these adjacent linear bodies are arranged in a staggered manner. By this, it is comprised as a board | plate body in which the vertically long slit-shaped opening part was formed in zigzag form by the front view.
The substrate structure disclosed in Patent Document 3 has an opening that forms a vertically long rhombus in front view by allowing a backrest of the chair to have a plurality of tolerances in the right and left directions with respect to the vertical direction in the front view. It is comprised as a plate body in which a plurality of parts are formed.
In the backrest of each of the above documents, the plurality of openings are arranged in a staggered manner, so that the individual openings are likely to spread in a direction (plane direction) orthogonal to the load input direction (plane perpendicular direction). ing. Thereby, the backrest (plate body) which has a some opening part deform | transforms so that it may spread greatly in a surface direction. Therefore, the back of the user supported by such a backrest is supported so as to be wrapped from both the left and right sides, and a firm hold feeling can be obtained.

Japanese Patent No. 3895084 Japanese Patent No. 4295266 Japanese Patent No. 5276304

By the way, in order to make the seating feeling more flexible, it is conceivable to increase the size of the opening as much as possible. However, the substrate needs to have a strength capable of supporting the weight of the user while providing a soft seating feeling. For this reason, there is a limit to increasing the size of the opening. Further, when the size of the opening is increased, there are problems that the user feels that a part of the body falls into the opening, and that the shape of the peripheral edge forming the opening is easily felt. Furthermore, in the tension-wrap type load support member having a cushion material, there is also a problem that the cushion material is likely to enter the opening and the surface of the load support member is easily marked.

The present invention was made in view of the above circumstances, and in the substrate structure of the load support member that receives a load in contact with the user in the chair, while obtaining a good seating feeling even if the size of the opening formed in the substrate is increased, It aims at maintaining the appearance of the surface of a load supporting member satisfactorily.

Moreover, the deformation | transformation of the surface direction of the board | substrate which has in a receiving surface structure part which contacts a user and receives a load is made | formed when an opening part spreads. In order to realize this movement, it is desirable that the striate body itself is easily deformed. As a means for realizing it, it is conceivable that the striate body is made thin.
However, since the backrest is a load support member, there is a problem in strength to make the wire body excessively thin. In the chairs disclosed in Patent Documents 2 and 3, the wire is thin in the left-right direction and thick in the front-rear direction to solve the strength problem. However, the substrate as a collection of such striatum becomes thicker in the front-rear direction, making it difficult to follow movements that cause the back to be greatly bent backwards, etc. Deformation may be hindered.

The present invention has been made in view of the above circumstances, and in a substrate structure of a load support member that receives a load in contact with a user in a chair, the linear body itself constituting the substrate can be easily deformed and deformation in a specific direction is not hindered. An object is to obtain a flexible seating feeling and to improve the load support while suppressing the thickness of the substrate.

In order to achieve the above-mentioned object, the present invention includes an opening forming portion in which a plurality of openings penetrating from the front surface to the back surface are formed on a substrate of a receiving surface configuration portion that receives a load in contact with a user in a chair. Thus, in the substrate structure of the load supporting member that promotes elastic deformation in the surface direction of the substrate, the installation portion is provided only at a specific portion of the opening forming portion and extends between the opposite end portions of the opening. , At least part of which is bent or extended with respect to the center line of the opening extending between the opposite ends.
According to this configuration, the erection portion provided between the opposite ends of the opening is easily bent in the direction across the opposite ends of the opening. Therefore, the opening is enlarged so that the opening forming portion in the substrate is flexible. In addition, the strength that can support the weight of the user can be secured by increasing the residual ratio of the resin in the opening of the specific portion. That is, it is possible to support the load even at the erection part in the opening, and to suppress the feeling that the body falls into the opening and the peripheral part of the opening.

In the above substrate structure, the erection portion may include an extending piece extending along the opening center line from the opposite end portion of the opening.
According to this configuration, the bending assisting portion of the erection portion is reliably separated from the opposite end portion of the opening by the extending piece, and the bending accelerating portion can be easily deformed independently, and the erection portion with the extending piece as a center. The twisting deformation becomes easy and the seating feeling can be made more flexible.
In the above substrate structure, the bending facilitating portion may have an erected linear body separated so as to be symmetric with respect to the opening center line.
According to this configuration, the bending-promoting portion has an appearance that further forms an opening in the opening, and is easily deformed in the surface direction when subjected to a load, so that the seating feeling can be made more flexible, and a separate installation line The obstruction member is arranged over a wide range of the opening by the body, and the sense that the body falls into the opening can be satisfactorily suppressed.
In the above substrate structure, the opening may be formed by an outer peripheral striate surrounding the outer periphery, and the bending assisting part may be formed by an erected striate thinner than the outer peripheral striatum.
According to this configuration, the erection part is more easily deformed by the slender erection line body than the outer peripheral striatum of the opening, and the seating feeling can be made more flexible.

In the above substrate structure, the opening may be formed in a hexagonal shape when viewed from the front, and the erection portion may be provided across a pair of opposing side portions facing each other in the shape of the opening when viewed from the front. Good.
According to this configuration, the ease of deformation of the hexagonal opening is maintained by the expansion and contraction of the installation portion, and the seating feeling can be made more flexible.
Further, in the substrate structure, the load support member constitutes a backrest that supports the back of the user, and the backrest forms a body support portion that protrudes to the user side above the lower end portion thereof, and the installation portion May be formed in a part including a body support part.
According to this configuration, it is possible to suppress the sensation of the body falling into the opening in the body support portion where a load on the backrest is easily applied. Further, if the body support portion is at a position corresponding to the user's waist, a flexible seating feeling can be surely obtained at a site where more flexible support is desired.
In the substrate structure, the load support member may have a cushion material on the surface of the substrate.
According to this configuration, in the tension-wrap type load support member having a cushioning material, even if the opening of the board is enlarged, the installation part is installed at a specific part that is easily subjected to the load of the board so as to obtain a flexible seating feeling. By providing the cushioning material, it is difficult for the cushioning material to enter the opening at a specific part that easily receives a load, and the mark of the opening is difficult to be attached to the surface of the load supporting member, so that the appearance of the surface of the load supporting member can be maintained well. .

Furthermore, the chair according to the present invention is a substrate in which the substrate of the receiving surface component that receives a load in contact with the user in the chair includes an outer peripheral frame portion and a plurality of linear bodies arranged inwardly thereof. In the substrate structure of the load supporting member that promotes elastic deformation in the surface direction, the substrate has a central portion in the lateral direction that protrudes toward the opposite user side with respect to both ends in the lateral direction. Each of the plurality of filaments extends in the longitudinal direction in the plane direction without intersecting with the other filaments, and the middle part in the longitudinal direction has both ends in the longitudinal direction. The curved shape or the curved shape of the plurality of linear bodies are symmetrical with respect to the horizontal center line of the substrate.
According to this configuration, each linear body is not only curved and deformed with respect to a load input in a direction perpendicular to the substrate, but is deformed so as to be twisted toward the anti-user side centering on both ends in the vertical direction. Thus, the amount of deformation of each striated body toward the non-user side is increased. The substrate is curved in the lateral direction so as to protrude toward the non-user side. However, since the deformation amount of each linear body increases symmetrically in the lateral direction, the curvature of the substrate that is the accumulation also increases symmetrically in the lateral direction. The entire substrate is deformed so as to wrap the user's body in the lateral direction. The plurality of linear bodies are curved or bent so that the intermediate portion in the vertical direction is positioned on the center side in the horizontal direction, and at a position corresponding to the intermediate portion in the vertical direction of each linear member that is likely to receive a seating load on the substrate. Since the filaments are densely arranged, the load can be easily supported without increasing the thickness of the substrate. Therefore, the linear body itself can be easily deformed to obtain a flexible seating feeling that does not impede deformation in a specific direction, and load support can be improved while suppressing the thickness of the substrate.

Further, in the above substrate structure, the gaps on both lateral sides of each of the plurality of linear bodies extend in the lateral direction from the linear bodies and connect the linear bodies to the other side across the gap. The connecting portion may be shorter in dimension in the thickness direction of the substrate than each linear body.
According to this configuration, while suppressing excessive deformation of the individual linear bodies, the linear bodies can be linked and deformed, and the dimension of the connecting portion in the substrate thickness direction can be shortened to reduce the load supporting member. Appropriate deformation can be secured.
Further, in the above substrate structure, the curvature of the curved shape of the plurality of linear bodies may be smaller in the central side than the linear bodies on both ends in the lateral direction of the substrate.
According to this configuration, since the amount of deformation of the linear body is smaller toward the laterally central side of the substrate than the laterally opposite ends, the entire substrate is not deformed to bend around the laterally central portion. It is possible to easily deform such that the body is deformed so as to be curved while leaving a certain width in the central portion in the direction, and the user's body is wrapped in the lateral direction over the entire substrate.

Moreover, in the said board | substrate structure, the linear body located in the center side of a horizontal direction among several linear bodies may extend over the opposing edge part of the vertical direction of an outer periphery frame part.
According to this structure, the part which suppressed deformation | transformation compared with the horizontal direction both ends can be set to the horizontal direction center part of a board | substrate, and the deformation | transformation which wraps a user's body in a horizontal direction with the whole board | substrate can be implement | achieved easily.
Further, in the above substrate structure, each of the plurality of linear bodies may be bent or bent toward the lateral end side of the outer peripheral frame portion at both longitudinal ends rather than the top portion toward the lateral central side. Good.
According to this configuration, each linear member is bent or bent toward the lateral end of the outer peripheral frame portion and connected to the outer peripheral frame portion, so that the deformation is such that each linear member is twisted toward the anti-user side. It becomes easier and the amount of deformation of each striated body toward the non-user side can be increased.
Further, in the above substrate structure, the load support member constitutes a backrest that supports the back of the user, and the backrest forms a body support portion that protrudes to the user side above the lower end portion thereof, The striate body may be formed such that the top to the center side in the lateral direction is located in the body support part.
According to this configuration, since the body support portion of the backrest is flexibly deformed by the deformation in which each linear body is twisted toward the anti-user side, if the body support portion is in a position corresponding to the user's waist Thus, it is possible to reliably obtain a flexible seating feeling at a site where more flexible support is desired.

According to the present invention, in the substrate structure of the load support member that receives a load in contact with the user in the chair, a good seating feeling can be obtained even if the size of the opening formed in the substrate is increased, and the load support member The appearance of the surface can be maintained well.

Further, according to the present invention, in the substrate structure of the load supporting member that receives a load in contact with the user in the chair, the linear body itself constituting the substrate can be easily deformed and the deformation in a specific direction is not hindered. A seating feeling can be obtained and load support can be improved while suppressing the thickness of the substrate.

It is a side view of the chair in embodiment of this invention. It is a top view of the said chair. It is a rear view of the said chair. It is a back side perspective view of the said chair. It is a block diagram of the curved shape change means of the said chair. It is a back view of the backrest provided with the engagement groove | channel of the said curved shape change means. FIG. 7 is a cross-sectional view taken along the line AA in FIG. It is a front view of the backrest board | substrate of the said chair. It is a top view of the said backrest board | substrate. FIG. 9 is a sectional view taken along line BB in FIG. It is the front view which showed the curve reference line of the linear body of the said backrest board | substrate. It is a front view of the principal part of the said backrest board | substrate. It is action | operation explanatory drawing of the principal part of the said backrest board | substrate before elastic deformation. It is action | operation explanatory drawing of the principal part of the said backrest board | substrate at the time of elastic deformation.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the user's “front” seated on the chair's seat with the back facing the back is indicated by arrow FR in the figure, and the user's “upward” is indicated by arrow UP in the figure. The “left” of the user is indicated by an arrow LH in the figure.

<Whole chair>
As shown in FIGS. 1 to 4, the chair 1 of the present embodiment includes a leg portion 2 placed on the floor F, a box-like support base 3 installed at the upper end of the leg portion 2, and a user. , A seat receiving member 5 that is attached to the upper surface of the support base 3 and supports the seat 4 so as to be slidable back and forth, and a backrest 6 that supports the back of the user seated on the seat 4. The backrest supporting member 7 that supports the backrest 6 from behind, and the curved shape changing means 8 that changes the curved shape of the receiving surface constituting portion 20 of the backrest 6 are provided.

The leg 2 has a diverging leg 9 with casters 9 a and a pedestal 10 that stands up from the center of the diverging leg 9 and incorporates a gas spring as an elevating mechanism. 3 is attached to be rotatable in the horizontal direction. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 10 and a tilt adjustment mechanism for the backrest support member 7. The back support member 7 has a substantially L shape in a side view, and a front lower end thereof is connected to a tilt adjustment mechanism in the support base 3.
In the figure, reference numeral 11 denotes a pivot shaft of the back support member 7 on the support base 3, and reference numeral 12 denotes an operation knob of a tilt adjustment mechanism protruding from the side surface of the support base 3.

The seat body 4 includes a seat plate 13 that forms a skeleton, and a seat body 14 that is attached to the upper portion of the seat plate 13. The seat body 14 is not shown in detail, but a seat frame (not shown) attached to the outer peripheral edge of the seat plate 13 and a cushion material (not shown) made of urethane or the like installed on the upper surface of the seat plate 13. And a seat skin material 15 which is stretched on the seat frame and covers the upper side of the cushion material.

The backrest 6 has a receiving surface component 20 that receives a load in contact with the user. The receiving surface constituent part 20 has a curved shape that protrudes backward in the plan view shown in FIG. The receiving surface constituting part 20 of the present embodiment includes a resin-molded backrest substrate 21, a cushion material (not shown) installed on the front surface of the backrest substrate 21, and a cushion material stretched on the backrest substrate 21. And a sheet skin material 22 covering the surface. For convenience of illustration, the backrest substrate 21 is shown flat.

The backrest 6 has a substantially rectangular shape with rounded corners in the rear view (equivalent to the front view) shown in FIG. Moreover, the backrest 6 has the protrusion part 23 bent forward, as shown in FIG. The backrest 6 of the present embodiment has a convexly bent shape in front as viewed from the side shown in FIG. The apex of the protrusion 23 is formed at a position corresponding to the user's waist. That is, the protruding portion 23 has a shape bent at an appropriate position so that a portion slightly above the lower end portion of the backrest 6 protrudes forward in a side view shown in FIG.

The backrest support member 7 supports the backrest 6 from behind. The backrest support member 7 is a strength member that has higher rigidity than the backrest 6 and supports the user's load received by the backrest 6. The backrest support member 7 is, for example, resin-molded, and has higher rigidity than the backrest 6 due to the thickness and size, the arrangement of reinforcing ribs, and the like. The backrest support member 7 has a frame portion 30 having an outer shape substantially the same as the outer shape of the backrest 6 in the rear view shown in FIG. The frame part 30 has an opening part 31 that opens greatly on the back side.

The backrest support member 7 has a protrusion 32 bent forward at a position corresponding to the protrusion 23 of the backrest 6. That is, the protrusion 32 has a shape bent at an appropriate position so that a portion slightly above the lower end of the frame 30 protrudes forward in a side view shown in FIG. An operation member 50 of the curved shape changing means 8 to be described later is disposed on the protruding portion 32. The backrest support member 7 includes a connecting portion 33 that extends forward from the lower end portion of the frame portion 30. The connecting portion 33 is connected to a tilt adjustment mechanism in the support base 3.

<Curved shape changing means>
Referring also to FIG. 5, the curved shape changing means 8 moves the central portion 24 and both end portions 25 in the width direction (left-right direction) of the backrest 6 relative to each other to move the curved shape of the receiving surface constituting portion 20. To change. The width direction is a direction across the left and right ends of the backrest substrate 21 and corresponds to the left-right direction in the present embodiment. Further, the direction across the upper and lower end portions of the backrest substrate 21 (generally corresponding to the vertical direction) is defined as the height direction.

As shown in FIG. 3, the curved shape changing means 8 has a holding portion 40 that holds the central portion 24 of the backrest 6 in a state where movement of the backrest support member 7 is restricted. Both end portions 25 of the backrest 6 are movable end portions 41 that can move back and forth with respect to the backrest support member 7. The holding portion 40 includes an upper holding portion 42 that holds the upper end portion of the center portion 24 of the backrest 6 on the upper end portion of the frame portion 30 of the backrest support member 7, and the lower back portion of the center portion 24 of the backrest 6. A lower engagement portion 43 that engages with the lower end portion of the support member 7.

The upper holding portion 42 includes, for example, a fastening means and a locking claw, and holds the upper end portion of the central portion 24 of the backrest 6 on the upper end portion of the frame portion 30 of the backrest support member 7. The upper holding portion 42 holds the upper end portion of the central portion 24 of the backrest 6 at the center in the width direction of the backrest 6 and three places on both sides thereof.

The lower engagement portion 43 is an engagement wall that stands on the connecting portion 33 of the backrest support member 7 so that the lower end portion of the central portion 24 of the backrest substrate 21 and the lower end portion of the central portion 24 are in contact with each other from the rear. 43a. In a state where the backrest substrate 21 is attached to the backrest support member 7, the lower engagement portion 43 causes the lower end portion of the central portion 24 to abut on the engagement wall 43 a from the rear by the elasticity of the backrest substrate 21, so that the backrest is supported. The forward movement (disengagement) of the lower end portion of the substrate 21 is restricted. On the other hand, when a load from the user's back is input to the backrest 6, the lower engagement portion 43 separates the lower end portion of the center portion 24 to the rear of the engagement wall 43 a, thereby Allow backward displacement of the lower end.

The lower engaging portion 43 allows the horizontal displacement and the vertical displacement of the lower end portion of the backrest substrate 21 as long as the engagement between the lower end portion of the central portion 24 and the engagement wall 43a is not released. The lower engagement portion 43 holds the lower end portion of the central portion 24 of the backrest 6 at one position in the center of the backrest 6 in the width direction.
Note that the upper end portion of the central portion 24 of the backrest 6 may be held so as to be movable in the height direction and the lower end portion of the central portion 24 may be held in a restrained state. If the movement of the central portion 24 in the front-rear direction is restricted, the upper and lower end portions of the central portion 24 may be held so as to be movable in the height direction or the like.

The moving end 41 is a free end of the backrest 6 that can move relatively freely with respect to the backrest support member 7, and is movable back and forth with respect to the backrest support member 7. That is, the moving end portion 41 can move back and forth by elastic deformation of the backrest 6 (backrest substrate 21) with the holding portion 40 as a fulcrum. The moving end portion 41 is provided at a position corresponding to the protruding portion 23 of the backrest 6. The operation member 50 of the curved shape changing means 8 is disposed at a position corresponding to the protruding portion 23 of the backrest 6, and the moving end 41 moves back and forth by the pressing of the operation member 50.

As shown in FIG. 1, the operation member 50 is movably supported by one of the backrest 6 and the backrest support member 7 (in this embodiment, the backrest support member 7). The operation member 50 has a grip 51 that can be gripped by the user by relatively moving the central portion 24 and both ends 25 of the backrest 6 back and forth. The gripper 51 improves the operability for the user, has a substantially L shape, protrudes to the side of the backrest 6, and can be gripped while the user is sitting on the seat 4.

The operation member 50 includes a base end portion 52 that is rotatably supported on one side (opposite surface 34 side in this embodiment) of the backrest 6 and the backrest support member 7 facing each other. And a distal end portion 53 that rotates around the base end portion 52 and presses the other side (opposite surface 26 side in this embodiment) of the opposing surfaces 26 and 34 of the backrest 6 and the backrest support member 7. . Further, on the other side of the opposing surfaces 26 and 34 of the backrest 6 and the backrest support member 7 (the opposing surface 26 side in this embodiment), as shown in FIG. An engagement groove 60 that can be engaged with the distal end portion 53 is formed.

As shown in FIG. 6, the engagement groove 60 is provided behind the backrest 6 along the outer shape of the both end portions 25. That is, the engagement groove 60 extends in the height direction (vertical direction). The engaging groove 60 extends so as to straddle the position corresponding to the protruding portion 23 of the backrest 6 in the vertical direction, and the width direction (left-right direction) along the inclined shape below the protruding portion 23 of the backrest 6. ) It is formed to bend inward.

As shown in FIG. 7, the engagement groove 60 is formed by a liner 61 having a predetermined slidability and a holding portion 64 in the liner support member 63. The liner 61 is in sliding contact with the distal end portion 53 of the operation member 50 and has a shape corresponding to the shape of the distal end portion 53. The distal end portion 53 of the operation member 50 of the present embodiment is formed in a ball shape (spherical shape), and the liner 61 is formed in an arc shape in a cross-sectional view. The liner 61 can be divided into a first liner member 61a and a second liner member 61b. The first liner member 61a and the second liner member 61b can be combined by an uneven fitting portion 62.

The liner 61 is fixed behind the backrest 6 (backrest substrate 21) by a liner support member 63. The liner support member 63 includes a holding portion 64 that holds the liner 61 and an engagement protrusion 65 that can be engaged with the backrest substrate 21. The holding portions 64 are provided as a pair at intervals smaller than the outer diameter of the liner 61. The engagement protrusion 65 is provided so as to protrude in the width direction (left-right direction) inside the liner support member 63. Note that a plurality of engagement protrusions 65 are provided at appropriate positions on the left and right sides of the liner support member 63 (not shown). Further, the liner 61 and the liner support member 63 may be integrally formed by means such as two-color molding.

The backrest substrate 21 has an attachment groove 66 to which the liner support member 63 can be attached. A plurality of ribs 67 are erected in the mounting groove 66. The liner 61 is sandwiched and fixed between the liner support member 63 and the plurality of ribs 67. The rib 67 is provided with an engagement hole 68 that engages with the engagement protrusion 65 of the liner support member 63. The engagement hole 68 is provided through the rib 67 in the width direction (left-right direction). The liner support member 63 is fixed to the backrest substrate 21 by the engagement protrusion 65 and the engagement hole 68 engaging with each other.

The operation member 50 has a distal end portion 53 engaged with the engagement groove 60, and a proximal end portion 52 supported rotatably on the rotation shaft 69. The rotating shaft 69 extends in the width direction and is provided on the back support member 7. The base end portion 52 has a bearing hole 70 through which the rotation shaft 69 is inserted. The diameter of the bearing hole 70 is designed to be larger than the diameter of the rotating shaft 69. That is, the base end portion 52 has a backlash in a direction orthogonal to the axis of the rotation shaft 69. The operation member 50 according to the present embodiment can move the distal end portion 53 in the width direction (left-right direction) along the engagement groove 60 by this play.

While sitting on the seat body 4, the user grips the grip portion 51 of the operation member 50 that projects to the left and right of the backrest 6 and pulls it upward. In the operation member 50, the base end portion 52 is rotatably supported by the backrest support member 7, and the tip end portion 53 is rotated upward about the base end portion 52 (see FIG. 5).
When the distal end portion 53 rotates upward, the operation member 50 pushes between the opposing surfaces 26 and 34 of the backrest 6 and the backrest support member 7 and pushes the distance between the opposing surfaces 26 and 34. The backrest support member 7 has higher rigidity than the backrest 6, and the backrest 6 side is elastically deformed.

The backrest 6 is held in a state in which the central portion 24 restricts forward movement to the backrest support member 7 by the holding portion 40, and both end portions 25 move relatively freely with respect to the backrest support member 7. Is possible. For this reason, the both ends 25 of the backrest 6 move forward by the pressing of the operating member 50 (see FIG. 5). The movement trajectory of both end portions 25 (moving end portion 41) at this time is indicated by a curve m1 in the figure. When both end portions 25 of the backrest 6 move forward, the curvature of the receiving surface constituting portion 20 of the backrest 6 increases, and the curved shape of the receiving surface constituting portion 20 is changed from the shape C1 to the shape C2.

In the present embodiment, since the back of the backrest 6 is supported by the backrest support member 7, the user's load can be reduced even if the rigidity of the backrest 6 is lowered as much as the strength can be secured by the backrest support member 7. Can receive. Therefore, sufficient elasticity can be given to the backrest 6 and the curved shape of the receiving surface constituting part 20 can be greatly changed. Further, since the backrest 6 relatively moves the central portion 24 and both end portions 25 in the width direction back and forth, the distance between the both end portions 25 in the width direction is not greatly changed when the curved shape is changed.

Further, in the present embodiment, the central portion 24 in the width direction of the backrest 6 is held in a state where movement of the backrest support member 7 is restricted, and moving end portions provided at both end portions 25 in the width direction of the backrest 6. 41 is designed to be moved back and forth by pressing 41 with the operating member 50. The moving end portion 41 is provided at a position corresponding to the protruding portion 23 that bends forward of the backrest 6. Since this protrusion 23 is a part that affects the sitting comfort by supporting the user's waist, the user's seating feeling can be easily changed by moving the position corresponding to the protrusion 23 back and forth. For example, the lateral displacement of the user can be prevented by changing the curved shape of the backrest 6 so as to hold the user's waist.

Thus, according to the above-described embodiment, the backrest 6 having the receiving surface constituting portion 20 that receives a load in contact with the user, the backrest support member 7 that supports the backrest 6 from behind, and the backrest 6. The curved shape of the backrest 6 is increased by including the curved shape changing means 8 that changes the curved shape of the receiving surface constituting portion 20 by relatively moving the central portion 24 and both end portions 25 in the width direction of the back and forth. The chair 1 that can be changed and can suppress a decrease in the force to support the user can be obtained.

In addition, although the structure which the front-end | tip part 53 of the operation member 50 presses the opposing surface side of the backrest 6 was demonstrated, it is a structure which the front-end | tip part 53 of the operation member 50 presses the opposing surface side of the backrest support member 7. Also good. Moreover, the structure which moves the center part 24 and the both ends 25 in the width direction of the backrest 6 directly with the hand directly without using the operation member 50 may be sufficient.

<Backrest board>
As shown in FIGS. 8 to 10, the backrest substrate 21 includes an outer peripheral frame portion 81 forming an outer edge portion thereof, and an opening penetrating from the front surface (front surface) to the rear surface (rear surface) on the inner peripheral side of the outer peripheral frame portion 81. And a mesh-shaped opening forming portion 86 for forming a plurality of the portions 87 in a constant pattern. The backrest substrate 21 is integrally formed by resin molding.

The outer peripheral frame portion 81 has a substantially rectangular shape with rounded corners so as to form a back view shape of the backrest 6. The outer peripheral frame portion 81 has upper and lower side portions 82 and 83 that extend horizontally from side to side in a rear view, and left and right side portions 84 and 85 that extend between the left and right ends of the upper and lower side portions 82 and 83.
A portion of the backrest substrate 21 corresponding to the protrusion portion 23 of the backrest 6 is a substrate protrusion portion 23a that bends forward.

In the rear view of the outer peripheral frame portion 81, the left and right side portions 84 and 85 are formed so as to gradually widen the left and right width from the upper end to the substrate protruding portion 23a. In the left and right side portions 84 and 85, the individual left and right widths of the lower portion including the substrate protrusion 23 a are wider than the individual vertical widths of the upper and lower side portions 82 and 83. The part below the board | substrate protrusion part 23a in the right-and- left side parts 84 and 85 inclines so that it may be located in the width direction inner side of the backrest 6 toward the lower side.

The opening forming part 86 includes a plurality of linear bodies 88 extending vertically so as to extend to the upper and lower sides 82 and 83 of the outer peripheral frame part 81, and the other linear bodies 88 adjacent to the left and right of each linear body 88 or the outer periphery. A plurality of connecting portions 89 connected to the frame portion 81. The opening forming portion 86 has a resin residual ratio lower than that of the outer peripheral frame portion 81, and is composed of a linear member 88 and a connecting portion 89 that are thinner than the outer peripheral frame portion 81. Therefore, it is rich in flexibility compared with the outer peripheral frame portion 81, and the width direction (generally left-right direction) along the surface as the surface direction of the backrest substrate 21, the height direction (generally vertical direction) along the surface, and the backrest. The substrate 21 is elastically deformed flexibly in the thickness direction (generally the front-rear direction) as the direction perpendicular to the surface of the substrate 21. This realizes a flexible seating feeling that suppresses the feeling of bottoming of the cushion, and facilitates deformation of the curved shape of the receiving surface constituting unit 20 by the curved shape changing means 8. The rigidity of the backrest substrate 21 is maintained by the outer peripheral frame portion 81 as a frame having a relatively high rigidity.

The entire backrest substrate 21 including the outer peripheral frame portion 81, and thus the backrest 6, as a whole, has moderate flexibility as compared with the backrest support member 7 having higher rigidity. It can be elastically deformed by operating the curved shape changing means 8 or the like.

The backrest 6 is a state in which the center portion 24 in the width direction is held by the backrest support member 7 in a state in which the movement is restricted, and the moving end portions 41 provided at both end portions 25 in the width direction are backrest support members. 7 is pressed by the operation member 50 supported by the actuator 7. Accordingly, both end portions 25 in the width direction are displaced forward with respect to the central portion 24 in the width direction, and both end portions 25 in the width direction are displaced rearward by releasing the press.

In this configuration, the lower end portion of the central portion 24 of the backrest 6 is not completely fixed, but only restricts forward movement, and flexibly moves up and down and right and left following the movement of the moving end portion 41 back and forth. Displace. For this reason, the force required for operation of the operation member 50 is small, and the operability of the operation member 50 is improved.

The upper fixing portion may be completely fixed, and the backrest 6 may be elastically deformed. However, the upper holding portion 42 is provided with appropriate play so that the upper end portion of the central portion 24 of the backrest 6 is also connected to the lower engaging portion 43. Similarly, if the semi-fixed state is adopted, the backrest 6 can move easily with respect to the backrest support member 7 and the operability of the operation member 50 becomes lighter.

The backrest substrate 21 is generally rearward (on the opposite side of the user) in a plan view of FIG. 9 so that both end portions 25 in the width direction are positioned forward (user side) with respect to the central portion 24 in the width direction. It is formed in a convex curved shape. The left and right side portions 84 and 85 of the outer peripheral frame portion 81 are formed in a curved shape that is convex forward in the plan view of FIG. 9, and are flush with the curved shape that is convex in the rear in the opening forming portion 86 on the inner side. It goes on top.

Further, the backrest substrate 21 has a portion slightly above the lower end (a portion slightly below the upper and lower middle portion, a portion having a height equivalent to the substrate protrusion 23a) and a substrate protrusion 23a that protrudes forward. In this way, it is formed in a gently bent shape convex forward in a side view of FIG. The backrest substrate 21 is curved in a gently concave shape that protrudes rearward in a side view, on the left and right inner sides above the substrate protrusion 23a. At the upper end portion of the backrest substrate 21, the side view curve is switched to a curved shape convex upward and forward.

The shape of the backrest substrate 21 described above is the shape of the front surface on the user side, and the receiving surface constituting portion 20 is formed along the shape of the backrest substrate 21, so that it follows the waist and back of the user. These are favorably supported from the rear, and the edge feeling of the outer periphery of the backrest 6 is also suppressed. In addition, the backrest board 21 has both ends in the width direction of the board protrusion 23a greatly displaced forward, and the curvature in plan view of the board protrusion 23a is increased to support the user's waist in the left-right direction. ramp up. Since the upper end of the backrest substrate 21 may be restrained, the curvature is reduced toward the upper side.

Each linear body 88 extends in the height direction without crossing the other linear bodies 88 in the front view of FIG. 11, and the intermediate portion in the height direction is the center in the width direction rather than the both end portions in the height direction. Curved to be convex to the side. A curved line k1 in the figure indicates a curved reference line of each linear body 88 in front view. The apex portion 88a on the center side in the width direction of the curve is at the same height as the substrate protrusion 23a. Since each linear body 88 is curved so as to follow the side view shape of the backrest substrate 21 (see FIG. 10), it has a three-dimensional curved shape that is convex forward and in the center in the width direction.

The curvature in the front view of each filament 88 is maximum at the height of the substrate protrusion 23a, and gradually decreases toward the end above and below the substrate protrusion 23a. Moreover, the curvature of the front view of each linear body 88 is set so that it may become so small that the linear body 88 of the width direction center side.

In the height portion (substrate protruding portion 23a) where the top portion 88a of each striate body 88 is located, the number of striate bodies 88 is the largest as compared with the upper part and the lower part thereof. When the board protrusion 23a is a lumbar part (waist support part) of the backrest board 21, the lumbar part increases the support load by increasing the number of main beams (wire bodies 88). Further, each linear body 88 curved three-dimensionally as described above is deformed with twisting so that the top portion 88a falls down to the left and right center side and rearward by a load from the front. Each linear body 88 is also deformed with twisting so that the top 88a falls down to the left and right center sides and rearward even when the curved shape changing means 8 is operated, thereby promoting the displacement of the outer peripheral frame 81. Have

For this reason, the backrest substrate 21 is deformed more flexibly, particularly in the lumbar portion, than when each linear body 88 is deformed so as to simply follow the load from the front. Moreover, the curved shape of each linear body 88 is symmetrical with respect to the center line CL in the width direction of the backrest substrate 21, and the number of main beams at the lumbar portion is further increased by deformation accompanied by twisting. The same applies to the case where the bending is strengthened by the operation of the bending shape changing means 8, and the support force of the lumbar portion is increased together with the increase in the curvature of the lumbar portion in plan view. The portion of the substrate protruding portion 23a on the center side in the width direction is the portion of the opening forming portion 86 that requires the most strength (the portion that receives the most load), and in this embodiment, the portion of the opening forming portion 86 that has the highest strength. In the opening 87, a later-described erection part 95 is provided only in a part where the need is (the part that receives the most load).

Each linear body 88 is connected to the upper and lower sides 82 and 83 of the outer peripheral frame 81 at both ends, but only the linear body 88 close to both ends 25 in the width direction of the backrest 6 has both ends thereof. By tilting outward in the width direction, both end portions of the linear member 88 are connected to the left and right side portions 84 and 85 of the outer peripheral frame portion 81, respectively.

As shown in FIG. 10, each linear body 88 appropriately changes the dimension t <b> 1 of the backrest substrate 21 in the thickness direction according to the portion of the backrest substrate 21. Specifically, the dimension t1 in the thickness direction of each linear member 88 is the longest at the middle part between the upper side part 82 and the substrate protruding part 23a in the height direction, and the gradual dimension t1 is shortened above the dimension t1. It is connected to the upper side part 82, and in the lower part, it is connected to the lower side part 83 via the lumbar part after gradually reducing the dimension t1. The dimension t1 in the thickness direction of each linear member 88 is set to be longer in the width direction toward the center and gradually shorter toward both ends. The dimension t2 in the thickness direction of the connecting portion 89 is set to be short for any part of each of the filaments 88.

When each linear member 88 receives a load from the user, it leaves both ends integrated with the outer peripheral frame portion 81 and is deformed so as to rearward along the user's back, and has the largest curve. It deform | transforms so that it may be twisted back from (top part 88a). At this time, it is the intermediate part between the upper restraint part connected to the outer periphery frame part 81 and the top part 88a that is most easily bent backward. However, since the thickness in the front-rear direction of the linear member 88 is thick at the intermediate portion between the upper restraint portion and the top portion 88a, the concentration of torsional deformation is suppressed. Moreover, since the line bodies 88 are connected to each other by the connecting portion 89 extending in the left-right direction, no step is generated between the line bodies 88 that are twisted and deformed.

With reference to FIGS. 8 and 12, the connecting portion 89 is disposed in each of the gaps 91 on both sides in the width direction of the plurality of line bodies 88, and extends from each line body 88 in the width direction so that the line bodies 88 are void. It connects with the other linear body 88 or the outer periphery frame part 81 on both sides of the part 91. FIG. A plurality of connecting portions 89 are formed at equal intervals in the height direction, and the positions in the height direction are made to differ by a half pitch on both sides in the width direction of each linear member 88. As a result, the plurality of connecting portions 89 are arranged in a staggered pattern on the entire backrest substrate 21. A plurality of openings 87 are formed in a staggered pattern in the entire backrest substrate 21 by the plurality of connecting portions 89 and the plurality of linear bodies 88. That is, the opening forming portion 86 of the backrest substrate 21 is formed in a mesh shape with a plurality of linearly extending linear members 88 and a connecting portion 89 that connects adjacent linear members 88.

Here, each striate body 88 is composed of a plurality of striate body constituting portions 92 that are connected to each other in the height direction. Each of the striate body constituting portions 92 is inclined with respect to the curve reference line k1 of each striated body 88 so that the striate body constituting portion 92 is inclined so as to be located on the center side in the width direction toward the lower side. It is divided roughly into the linear structure part 92 which inclines so. The linear structure components 92 that are inclined in different directions in the front view are alternately connected, so that each linear structure 88 extends vertically while meandering in the front view. The linear member 88 facilitates expansion and contraction in the height direction when the curved shape changing means 8 is operated by deformation that extends linearly or bends in a bellows shape. Further, as shown in FIGS. 5 and 9, the expansion and contraction is performed by the function of the curved shape changing means 8, so that both end portions of the outer peripheral frame portion 81 move along the inward curve m <b> 1 and both ends of the outer peripheral frame portion 81. This occurs when the distance in the width direction between the parts is reduced.

Referring to FIG. 12, each of a pair of linear bodies 88 adjacent in the width direction is symmetrical with each other across a center line (center line between curved reference lines k1) k2 between them in front view. It has an inclined filament structure part 92. Thereby, each of a pair of linear body 88 which adjoins in the width direction is formed by meandering so as to be symmetric with respect to the center line k2.

The plurality of connecting portions 89 that connect between a pair of linear bodies 88 adjacent in the width direction are end portions 92 a that are adjacent to each other in the width direction of the plurality of linear body constituting portions 92 in the pair of linear bodies 88. Connect between the two. Thereby, each opening part 87 formed by the linear body 88 and the connection part 89 is formed in the hexagon shape where the width | variety in a height direction intermediate part is wider than the width | variety in the height direction both ends.
The width of the gap portion 91 between the pair of filaments 88 is narrower than the pitch between the connecting portions 89 arranged at equal intervals in the height direction in the gap portion 91, and each opening 87 has a vertically long shape that is long in the height direction. It is formed in a hexagonal shape. The mesh-shaped opening forming portion 86 is formed by arranging hexagonal opening portions 87 formed by the frame-like linear body 88 and the connecting portion 89 in a zigzag manner, thereby arranging them in a plane direction (height direction and width direction). ).

The connecting part 89 connects the apex part (end part 92 a of the linear member constituting part 92) that protrudes outwardly on the both sides in the width direction of the hexagonal opening part 87 when viewed from the front to the same apex part of the adjacent opening part 87. . Thus, when the linear shape members 88 are displaced so as to approach each other in the width direction when the curved shape changing means 8 is operated, as shown in FIG. And the linear body 88 on both sides of the opening 87 is deformed so as to extend vertically. As a result, the opening 87 is deformed so as to be contracted to the left and right and to be extended vertically. Although the dimension t2 in the thickness direction of the connecting portion 89 is shorter than the dimension t1 in the thickness direction of each linear member 88, the dimension t3 (see FIG. 12) in the height direction of the connecting portion 89 is the other portion in the lumbar portion. It is set longer than the dimension t3 of the connecting portion 89, and strengthens the force that shrinks the opening 87 to the left and right. Further, since the dimension t3 of the connecting portion 89 of the lumbar portion is longer than the dimension t3 of the connecting portion 89 of the other part, the connecting portion 89 becomes closer to a plate shape, and is deformed in a more planar direction with respect to a load from the front. It becomes easy to do.

As described above, the erection part 95 is provided in the opening 87 at the portion constituting the lumbar part of the opening forming part 86. The erected portion 95 extends vertically in the opening 87 having a hexagonal shape when viewed from the front, and is connected to the upper and lower ends of the opening 87 on the opening center line k3 overlapping the center line k2, as shown in FIG. It has the installation piece 96 and the bending | flexion promotion part 97 provided between the up-and-down extending piece 96. FIG.

The bending facilitating portion 97 has a pair of erected linear bodies 98 separated so as to be symmetrical with respect to the opening center line k3. Each erected linear body 98 has a curved portion 98a in which an intermediate portion in the height direction is curved toward the opening center line k3 with respect to the opening center line k3 extending between the upper and lower sides facing each other in the opening 87. .

The opening 87 is formed by an outer peripheral linear body (a linear body 88 and a connecting part 89) that surrounds the outer periphery thereof, but the bending facilitating portion 97 is a construction linear body 98 that is thinner than the outer peripheral linear body in a front view. Formed with. Since the bending facilitating portion 97 is connected to the outer peripheral linear body via the extending piece 96 on the opening center line k3, there is little influence of deformation of the outer peripheral linear body, and it is individually independent of the opening 87. It can be deformed. Further, the bending facilitating portion 97 is easily bent up and down by the pair of curved portions 98a and easily bent in the left-right direction by opening between the pair of erected linear bodies 98, and is further twisted around the vertically extending piece 96. Deformation is allowed.

Such a bending facilitating portion 97 is flexibly deformed independently without inhibiting the deformation of the opening 87, allows deformation by the curved shape changing means 8, and receives a load from the user.
Further, as compared to the case where the bending facilitating portion 97 is made of a single striate body, the bending facilitating portion 97 is arranged so as to spread in the opening 87, so that the user's body enters the opening 87. It is suppressed well.

Hereinafter, the operation of the backrest substrate 21 will be described.
First, when a backward load is input from the user's body to the receiving surface component 20 of the backrest 6, the same load is generally applied to the appropriate position of the backrest substrate 21 through the seat skin material 22 and the cushion material. Entered in direction. By this input, each linear body 88 of the opening forming portion 86 is bent in the direction perpendicular to the surface and elastically deformed so that each opening 87 is expanded and contracted in the surface direction.

Since each opening 87 is vertically long and long in the height direction, it tends to be deformed to expand and contract in the width direction. Since each opening 87 is arranged in a staggered manner, connecting portions 89 are arranged on both sides in the width direction, and each opening 87 is widened by being pushed or pulled by the connecting portion 89 in the width direction. Easy to expand and contract in the direction. Since the installation part 95 provided in the lumbar part extends in the height direction of the opening part 87, it is difficult to affect the deformation of the opening part 87 in the width direction. Even when each opening 87 expands and contracts in the height direction along with expansion and contraction in the width direction by the operation of the curved shape changing means 8, deformation in the height direction is allowed by the bending assisting portion 97 of the erection portion 95.

When each opening 87 is deformed so as to expand and contract in the height direction by the operation of the curved shape changing means 8, both side portions protruding outward in the width direction are bent and stretched in the height direction and deformed satisfactorily. To do. The erection portion 95 extends in the height direction of the opening portion 87, but also follows the deformation in the height direction of the opening portion 87 by the bending assisting portion 97 of the erection portion 95 itself. Even when the opening 87 is deformed so as to be twisted, the installation portion 95 is connected to the outer peripheral linear body of the opening 87 via a pair of substantially coaxial extending pieces 96, thereby Interacting with deformation is suppressed.

In the lumbar portion where the erection portion 95 is provided, the user's body comes into contact more strongly. However, since the erection portion 95 provided in the opening portion 87 of the lumbar portion also receives the load of the user, a part of the body is open to the opening portion 87. The feeling of getting inside is suppressed. Moreover, the installation part 95 itself may be easily deformed, and the influence on the flexible seating feeling can be suppressed. By providing the installation portion 95 (blocking portion) that does not hinder the deformation in the opening 87 only in the portion where the load on the backrest substrate 21 is easily received, a flexible seating feeling can be obtained in the tension-wrap type backrest 6. As described above, even when the mesh of the backrest substrate 21 is rough (even if the opening 87 is enlarged), the cushion material or the seat skin material 22 is difficult to enter into the opening 87 in a portion that is susceptible to a load, and the load is applied. The sheet skin material 22 does not leave a trace of the mesh of the back substrate 21 at a site that is easily received.

The lower end portion of the central portion 24 of the backrest 6 is only restricted from being displaced forward, and can be flexibly displaced up, down, left, and right when changing the curved shape in plan view by operating the curved shape changing means 8. Therefore, the operation of the operation member 50 is lightened to improve the operability. When increasing the curvature of the lumbar portion, each opening 87 of the lumbar portion is shrunk in the width direction, but this deformation is not hindered by the erection portion 95, and each opening 87 is activated by the operation of the curve shape changing means 8 or from the front. Even in the case of extending in the height direction due to the load, the deformation in the height direction is improved by the bending assisting portion 97 of the erection portion 95.

Each of the three-dimensional curved line elements 88 that are convex toward the front and in the center in the width direction is flexibly deformed particularly at the lumbar part where the large curved part (the top part 88a) gathers. In addition, the number of the striated bodies 88 of the lumbar part and the curvature in plan view are increased by deforming the striated bodies 88 to be twisted rearward by the operation of the curved shape changing means 8 or the load from the front, and the waist portion Increased support power. As described above, the linear body 88 itself can be easily deformed to obtain a flexible seating feeling, and load support can be favorably performed.

As described above, the board structure of the load support member (backrest 6) of the chair 1 of the above embodiment is applied to the backrest board 21 of the receiving surface component 20 that receives the load in contact with the user in the chair 1. By providing an opening forming portion 86 in which a plurality of openings 87 penetrating from the front surface to the back surface are formed, elastic deformation in the surface direction of the backrest substrate 21 is promoted. Further, the substrate structure includes an erection portion 95 that extends between the opposite ends of the opening 87 only at a specific portion of the opening formation portion 86, and the erection portion 95 extends along the opening center line k3 that extends between the opposite ends. On the other hand, a bending facilitating portion 97 extending at least partially curved or bent is provided.
According to this configuration, the erection portion 95 provided between the opposing ends of the opening 87 is easily bent in the direction across the opposing ends of the opening 87. In addition, the opening forming portion 86 is made flexible, the residual rate of the resin in the opening 87 at the specific portion is increased, and the strength capable of supporting the weight of the user can be secured. That is, the load is also supported by the erection part 95 in the opening part 87, and the feeling that the body falls into the opening part 87 and the feeling in contact with the peripheral part of the opening part 87 can be suppressed.

Further, the erection part 95 includes an extension piece 96 that extends from the opposite end of the opening 87 along the opening center line k3.
According to this configuration, the bending facilitating portion 97 of the erection portion 95 is reliably separated from the opposite end portion of the opening 87 by the extending piece 96, and the bending facilitating portion 97 is easily deformed independently, and the extending piece The deformation in which the installation part 95 is twisted around the center 96 becomes easy, and the seating feeling can be made more flexible.

Further, the bending facilitating portion 97 has an erected linear body 98 separated so as to be symmetric with respect to the opening center line k3.
According to this configuration, the bending assisting portion 97 has a form that further forms an opening in the opening 87, and is easily deformed in the surface direction when receiving a load, making the seating feeling more flexible and separated. The occluding member is arranged over a wide range of the opening 87 by the erected wire rod 98, and the feeling of the body falling into the opening 87 can be satisfactorily suppressed.

Further, the opening 87 is formed by an outer peripheral linear body (a linear body 88 and a connecting portion 89) that surrounds the outer periphery thereof, and the bending facilitating portion 97 is formed by an erected linear body 98 that is thinner than the outer peripheral linear body. The
According to this configuration, the erected portion 95 is more easily deformed by the erected striated wire body 98 than the outer peripheral striated body of the opening 87, and the seating feeling can be made more flexible.

The opening 87 is formed to have a hexagonal shape when viewed from the front, and the erection portion 95 is provided between a pair of opposing side portions facing each other in the front view of the opening 87.
According to this configuration, the ease of deformation of the hexagonal opening 87 is maintained by the expansion and contraction of the installation portion 95, and the seating feeling can be made more flexible.

Further, the backrest 6 that supports the user's back forms a body support portion (protrusion portion 23) that protrudes to the user side above the lower end portion thereof, and the installation portion 95 includes a portion including the protrusion portion 23. Formed.
According to this configuration, it is possible to suppress the feeling of the body falling into the opening 87 at the protrusion 23 at which the load on the backrest 6 is easily applied. Moreover, if the protrusion part 23 exists in the position corresponded to a user's waist | hip | lumbar, a flexible seating feeling can be reliably acquired in the site | part for which a more flexible support is desired.

Further, the backrest 6 has a cushion material on the surface of the backrest substrate 21.
According to this structure, even if the opening 87 of the backrest substrate 21 is enlarged in the tension-wrap type backrest 6 having the cushion material, the load on the backrest substrate 21 is increased even if the opening 87 of the backrest substrate 21 is enlarged. By providing the erection part 95 at a specific part that is easily received, the cushion material is less likely to enter the opening 87 at the specific part that is susceptible to a load, and the trace of the opening 87 is less likely to be attached to the surface of the backrest 6. The appearance of the surface of the drooping 6 can be maintained well.

Furthermore, the substrate structure of the load support member (backrest 6) of the chair 1 of the above embodiment is such that the backrest substrate 21 of the receiving surface component 20 that receives the load in contact with the user in the chair 1 is the outer frame portion 81. By providing a plurality of filaments 88 disposed on the inside thereof, elastic deformation in the surface direction of the backrest substrate 21 is promoted. Furthermore, the backrest substrate 21 has a shape that is bent or curved so that the central portion 24 in the width direction in the surface direction protrudes toward the opposite user side with respect to both end portions 25 in the width direction. In addition, each of the plurality of linear bodies 88 extends in the height direction in the plane direction without intersecting with the other linear bodies 88, and the intermediate portion in the height direction is more than both end portions in the height direction. The plurality of linear bodies 88 are bent or bent so as to protrude toward the center in the width direction, and the bent or curved shapes of the plurality of linear bodies 88 are symmetrical with respect to the width direction center line CL of the backrest substrate 21.
According to this configuration, each linear body 88 is not only curved and deformed with respect to the load input to the backrest substrate 21 in the direction perpendicular to the surface, but is twisted toward the anti-user side centering on both ends in the height direction. It deform | transforms so that the deformation amount to the anti-user side of each linear body 88 may be enlarged. The backrest substrate 21 is curved in the width direction so as to protrude toward the anti-user side. However, since the deformation amount of each linear member 88 increases symmetrically in the width direction, the curvature of the backrest substrate 21 which is an accumulation thereof is also increased. It becomes symmetrically large in the width direction, and is deformed so as to wrap the user's body in the width direction with the entire backrest substrate 21. The plurality of linear bodies 88 are curved or bent so that the intermediate portion in the height direction is positioned on the center side in the width direction, and the height of each linear body 88 that is likely to receive a seating load on the backrest substrate 21. Since the linear members 88 are densely arranged at the position corresponding to the intermediate portion, it is easy to support the load without increasing the thickness of the backrest substrate 21. In this way, the linear body 88 itself can be easily deformed to obtain a flexible seating feeling that does not hinder the deformation in a specific direction, and the thickness of the backrest substrate 21 is suppressed, and load support is improved. Can do.

In addition, in the gap portions 91 on both sides in the width direction of the plurality of linear bodies 88, connecting portions 89 that extend in the width direction from the respective linear bodies 88 and connect the respective linear bodies 88 to the other side across the gap portion 91. The connecting portion 89 is shorter in the thickness direction of the backrest substrate 21 than each linear body 88.
According to this structure, while suppressing the excessive deformation | transformation of each linear body 88, while being able to link and deform | transform each linear body 88, the dimension of the thickness direction of the backrest board | substrate 21 of the connection part 89 is made. It can be shortened to ensure an appropriate deformation of the load supporting member.

Further, the curvature of the curved shape of the plurality of linear bodies 88 is smaller as the linear body 88 on the center side than the linear bodies 88 on both ends in the width direction of the backrest substrate 21.
According to this configuration, since the amount of deformation of the linear member 88 is smaller toward the center side in the width direction of the backrest substrate 21 than at both ends in the width direction, the entire backrest substrate 21 is bent around the center portion 24 in the width direction. Therefore, it is possible to easily realize a deformation that wraps the user's body in the width direction with the backrest substrate 21 as a whole, without being deformed.

In addition, among the plurality of linear bodies 88, the linear body located on the center side in the width direction extends between the opposing end portions in the height direction of the outer peripheral frame portion 81.
According to this configuration, it is possible to set a portion in which deformation is suppressed as compared to the width direction both end portions 25 in the width direction central portion 24 of the backrest substrate 21, and to wrap the user's body in the width direction with the backrest substrate 21 as a whole. Can be easily realized.

In addition, each of the plurality of linear bodies 88 is curved or bent toward the end in the width direction of the outer peripheral frame 81 at the both ends in the height direction from the top 88a toward the center in the width direction.
According to this configuration, each linear body 88 is bent or bent toward the end in the width direction of the outer peripheral frame portion 81 and connected to the outer peripheral frame portion 81, so that each linear body 88 is twisted toward the anti-user side. Such a deformation | transformation becomes easier and the deformation amount to the anti-user side of each linear body 88 can be enlarged more.

Further, the backrest 6 that supports the user's back forms a body support portion (protrusion portion 23) that protrudes toward the user side above the lower end portion, and the plurality of striate bodies 88 are arranged in the width direction. The top portion 88 a toward the center side is formed so as to be located at the protruding portion 23.
According to this configuration, the body support portion of the backrest 6 is flexibly deformed by the deformation in which each linear body 88 is twisted toward the anti-user side, so that the protruding portion 23 is in a position corresponding to the user's waist. If so, a flexible seating feeling can be reliably obtained at a site where more flexible support is desired.

The present invention is not limited to the above-described embodiment. For example, the load support member may be a lumbar support, a headrest or the like in addition to the seat body 4 and the backrest 6. The load support member is not limited to the load support member in which the backrest substrate 21 constitutes a part of the load support member by providing the backrest substrate 21 with a cushioning material, an outer skin, and the like. May be configured. In the said embodiment, although the receiving surface structure part 20 demonstrated the structure containing the backrest board | substrate 21 and the urethane cushion and skin material etc. which cover the front surface, cushion materials other than urethane may be sufficient, or it is only skin material. The back cover substrate 21 may be covered.

In the above embodiment, the configuration in which the central portion 24 in the width direction of the backrest 6 is held in the movement restricted state and both end portions 25 in the width direction of the backrest 6 are moved back and forth has been described. The structure which hold | maintains the both ends 25 in the back, and moves the center part 24 in the width direction of the backrest 6 back and forth may be sufficient.
A configuration in which the striatum component 92 forms part of the striatum 88 may be used. The curved shape of each part may be a bent shape, and the bent shape may be a curved shape. The bent shape may be not only a single bend but also a shape including a plurality of bends.
As a modification of the erection part 95, a thin plate shape in which the upper and lower end parts are connected to the opposing end part of the opening 87 or the extended piece 96 may be used. In this case, the entire erected portion of the thin plate becomes the bending assisting portion, and it is possible to obtain the same operational effect.
The above-described configuration is an example of the present invention, and various modifications can be made without departing from the gist of the present invention.

According to the present invention, in the substrate structure of the load support member that receives a load in contact with the user in the chair, a good seating feeling can be obtained even if the size of the opening formed in the substrate is increased, and the load support member The appearance of the surface can be maintained well.
In addition, in the board structure of the load supporting member that receives a load in contact with the user in the chair, the linear body itself constituting the board is easily deformed to obtain a flexible seating feeling that does not hinder the deformation in a specific direction, It is possible to improve the load support while suppressing the thickness of the substrate.

1 Chair 6 Backrest (Load Support Member)
20 receiving surface component 21 backrest substrate (substrate)
23 Protruding part (body support part)
81 Peripheral frame portion 86 Opening forming portion 87 Opening portion 88 Linear body (outer peripheral linear body)
88a Top 89 Connection part (peripheral striatum)
91 Cavity part 95 Installation part 96 Extension piece 97 Deflection promotion part 98 Installation line body k3 Opening center line CL Width direction center line (lateral direction center line)

Claims (10)

1. The substrate of the receiving surface component that receives a load in contact with the user in the chair is provided with an opening forming portion in which a plurality of openings penetrating from the front surface to the back surface are formed, whereby elastic deformation in the surface direction of the substrate is performed. In the substrate structure of the promoted load support member,
   Only in a specific part of the opening forming part, provided with a erection part that spans between opposing ends of the opening,
   The board structure of a load support member of a chair, wherein the erection portion includes a bending assisting portion that extends at least partially curved or bent with respect to an opening center line extending between the opposing end portions.
2. 2. The board structure for a load support member of a chair according to claim 1, wherein the erection portion includes an extending piece extending along an opening center line from an opposite end portion of the opening.
3. 3. The substrate structure for a load support member for a chair according to claim 1 or 2, wherein the bending facilitating portion has an erected linear body separated so as to be symmetrical with respect to the opening center line.
4. The opening is formed by an outer peripheral striate surrounding the outer periphery,
   The board | substrate structure of the load supporting member of the chair as described in any one of Claim 1 to 3 in which the said bending | flexion promotion part is formed by the erected linear body thinner than the said outer periphery linear body.
5. The opening is formed to have a hexagonal shape when viewed from the front,
   5. The board structure of a load support member for a chair according to claim 1, wherein the erection portion is provided across a pair of opposing side portions facing each other in a front view shape of the opening.
6. The substrate of the receiving surface constituent part that receives a load in contact with the user in the chair includes an outer peripheral frame part and a plurality of linear bodies arranged on the inner side thereof, whereby elastic deformation in the surface direction of the substrate is performed. In the substrate structure of the promoted load support member,
   The substrate has a shape that is bent or curved so that a central portion in the lateral direction of the surface direction protrudes toward the opposite user side with respect to both ends in the lateral direction,
   Each of the plurality of striatums extends in the longitudinal direction of the surface direction without intersecting with other striatums, and the intermediate part in the longitudinal direction is in the lateral direction rather than both ends in the longitudinal direction. Curved or bent so as to protrude to the center side of
   The board structure of a load supporting member for a chair according to any one of claims 1 to 5, wherein the bent shape or the curved shape of the plurality of striate bodies are symmetrical with respect to a horizontal center line of the board.
7. In the gaps on both sides in the lateral direction of each of the plurality of striated bodies, connecting portions are formed that extend from the striated bodies in the lateral direction and connect the striated bodies to the other side with the gaps interposed therebetween. And
   The board | substrate structure of the load supporting member of the chair as described in any one of Claim 1 to 6 with which the said connection part has the dimension of the thickness direction of the said board | substrate shorter than each said linear body.
8. The chair according to any one of claims 1 to 7, wherein a curvature of the curved shape of the plurality of striates is smaller in a central striate than a striate on both sides in the lateral direction of the substrate. The substrate structure of the load support member.
9. The linear body located in the center side of the horizontal direction among the plurality of linear bodies extends over between the opposing ends in the vertical direction of the outer peripheral frame part. The board | substrate structure of the load supporting member of the chair of description.
10. Each of the plurality of striated bodies is curved or bent toward the lateral end side of the outer peripheral frame portion at both ends in the longitudinal direction with respect to the top toward the central side in the lateral direction. The board | substrate structure of the load supporting member of the chair as described in any one of Claim 9.

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