JP6341597B2 - Chair - Google Patents

Description

  The present invention relates to a chair provided with a backrest.

  As a chair provided with a backrest related to the above technical field, for example, a chair described in Patent Document 1 is known. This chair has a movable / locking mechanism that deforms the arc shape of the left and right sides of the backrest in a plan view so as to wrap the waist of the seated person.

Japanese Patent No. 4185992

The backrest 3 of the chair described in Patent Document 1 includes a backrest shell 31, a backrest cover 32, and a cushion. The belt-like auxiliary support plates 31b and 31c formed on the left and right side portions of the backrest shell 31 are elastically deformed in the front-rear direction, thereby pushing the lower side portion of the backrest portion 3 forward, The waist is deformed to wrap around from the left and right. This structure has an excellent effect of improving the lumbar hold feeling during work and increasing concentration during work.
By the way, the backrest shell 31 needs to have a function as a strength member. For this reason, the backrest shell 31 includes a shell frame 31f forming an outer edge portion, and a plurality of vertical and horizontal ribs 31r arranged in the inner peripheral space. Therefore, the auxiliary support plates 31b and 31c are elastically deformed by bending only at their roots. This makes it easier for the auxiliary support plates 31b and 31c to deteriorate over time (particularly, the root portion is dropped). In addition, the deformation of the backrest shell 31 tends to remain local rather than overall, and it is difficult to deform such that the entire backrest is gently curved.

  The present invention has been made in view of the above circumstances, and in a chair that deforms an arc shape in plan view of the left and right sides of the backrest, suppresses local deformation of the backrest and increases the degree of freedom of deformation of the backrest. For the purpose.

In order to achieve the above object, the present invention employs the following means.
That is, the chair according to the present invention includes a backrest having a receiving surface component that receives a load in contact with a seated person, a backrest support member that supports the backrest from behind, and a central portion in the width direction of the backrest. And a curved shape changing means for changing the curved shape of the receiving surface constituting portion by moving both end portions back and forth, and the substrate of the receiving surface constituting portion in the backrest has both ends in the width direction. A deformable portion that is integrally formed inward of the portion and elastically deforms in the width direction to allow deformation of the receiving surface constituting portion due to the relative movement, and the curved shape changing means includes the spine A base end portion that is rotatably supported on either one of opposing surfaces of the backrest and the backrest support member, and a base end portion that rotates around the base end portion, and the backrest and the backrest support member Press the other side of the opposite surface And a distal end that, characterized in that it comprises an operating member having a.
According to this configuration, when the curved shape of the receiving surface constituent portion is changed, the deformation permitting portion on the inner side in the width direction expands and contracts in the width direction to deform the receiving surface constituent portion as a whole. For this reason, the local load to the site | part used as the starting point of a deformation | transformation of a receiving surface structure part is suppressed, and the failure | damage by aged deterioration, etc. can be suppressed. Moreover, the deformation | transformation area | region of a receiving surface structure part is easy to be expanded, and the deformation | transformation which wraps a seated person's back in the width direction is realizable.

Further, in the chair, the substrate includes an outer peripheral frame portion that surrounds the periphery of the deformable portion and has a rigidity higher than that of the deformable portion, and the deformable portion is located inside the outer peripheral frame portion. The structure provided with the several linear body extended in the height direction of the said backrest may be sufficient.
According to this configuration, the outer peripheral frame portion having a relatively high rigidity can be used as the skeleton of the receiving surface configuration portion, and the deformation allowing portion can be more easily deformed in the width direction, and the backrest can be configured to be strong and flexible.
In the chair, at least one of the upper and lower end portions of the outer peripheral frame portion may be supported by the backrest support member so as to be movable in the height direction.
According to this structure, the deformation | transformation of the height direction of a board | substrate accompanying the change of the curved shape of a backrest is accept | permitted, and realization of the deformation | transformation which wraps a seated person's back in a width direction can be performed easily.

Further, in the chair, at least one of the plurality of striatums has a plurality of striatum components connected to each other in the height direction, and each of the plurality of striatum components is The structure extended at a different angle with respect to the other linear body structure part connected to at least one of upper and lower sides may be sufficient.
According to this configuration, since the striatum includes a portion in which the striatum components having different angles are connected, the striatum has a height along with deformation of the backrest when the curved shape changing means is operated. Even when extending in the direction, the backrest can be easily deformed.
Further, in the chair, each of the pair of linear bodies adjacent in the width direction may have the linear body configuration portion that is inclined so as to be symmetrical with respect to a center line therebetween. .
According to this configuration, a region that can be expanded and contracted in the height direction when the curved shape changing means is operated is formed by the pair of or more striated bodies, and the backrest can be more easily deformed.

Further, in the chair, the gaps on both sides in the width direction of each of the plurality of filaments may extend from the filaments in the width direction so that the filaments are on opposite sides of the gaps. A connecting portion to be connected may be formed, and the connecting portion may have a different position in the height direction on both sides in the width direction of each of the filaments.
According to this structure, while suppressing the excessive deformation | transformation of each filament by a connection part, it prevents a connection part from continuing in the width direction, and can implement | achieve a moderate backrest deformation | transformation.
Further, in the chair, a plurality of the connecting portions are formed at equal intervals in the height direction, and are arranged in a staggered manner on the entire deformation allowing portion, and the deformation allowing portions are the plurality of striated bodies. And the structure which forms the some opening part arrange | positioned in the zigzag form on the whole by the said some connection part may be sufficient.
According to this configuration, a plurality of linear bodies and connecting portions are arranged in a mesh shape to constitute a deformation permissible portion in which a plurality of openings are formed, and when the bending shape changing means is operated, Flexible deformation can be realized.

Further, in the chair, each of the plurality of striatums is configured by a plurality of striatum components that are connected to each other in the height direction, and each of the plurality of striatum components is above and below Each of the pair of linear elements adjacent to each other in the width direction extends at a different angle with respect to the other linear element constituent part connected to at least one to meander the linear elements, and a center line therebetween The plurality of connecting portions that are formed symmetrically with respect to each other and that connect between the pair of linear bodies are in the width direction of the linear body constituting portion in each of the pair of linear bodies. The structure which connects between the edge parts which adjoin each other may be sufficient.
According to this configuration, each opening formed by the plurality of linear bodies and the connecting portion has a hexagonal shape in which the width at the intermediate portion in the height direction is larger than the width at both ends in the height direction, and is curved. When the backrest is deformed in the height direction when the shape changing means is operated, the opening extends in the height direction so as to constrict the height direction intermediate part in the width direction. The backrest can be easily deformed.

Moreover, the said structure WHEREIN: The structure which changes the dimension of the said height direction according to the position of the said backrest may be sufficient as these connection parts.
According to this configuration, since the dimension in the height direction of the connecting portion can be made larger than the other parts in the predetermined part of the backrest and the rigidity can be increased, particularly when the curved shape changing means is operated, If a high-rigidity connecting part is placed in the part that you want to greatly deform, the action of the connecting part will push the striation body in the width direction and extend the opening part in the height direction. The backrest can be more easily deformed.
Further, in the chair, at least one of the plurality of striate bodies is such that an intermediate portion in the height direction is at a center side in the width direction with respect to both ends connected to the outer peripheral frame portion in the height direction. It may be configured to bend or bend so as to be located at the center.
According to this configuration, when the curved shape changing means is operated, both ends of the backrest in the width direction move relative to the center in the width direction, so that the linear body is elastically deformed in the height direction as a whole. It is easy to do and can change backrest more easily.

  ADVANTAGE OF THE INVENTION According to this invention, in the chair which deform | transforms the arc shape in planar view of the right-and-left side part of a backrest, while suppressing the local deformation | transformation of a backrest, the freedom degree of a deformation | transformation of a backrest can be raised.

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. It is AA sectional drawing of 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. It is BB sectional drawing of 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 operation | movement explanatory drawing of the principal part of the said backrest board | substrate, (a) is before elastic deformation, (b) shows the time of the elastic deformation extended to a height direction, respectively.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the “front” of the seated person sitting on the chair seat with the back facing back is indicated by arrow FR in the figure, and the “upward” of the seated person is indicated by arrow UP in the figure. The “left side” of the seated person 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-shaped support base 3 installed at the upper end of the leg portion 2, and a seated person. , 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 seated person 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 portion, 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 seated person. 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 seated person'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 load of the seated person received by the backrest 6. The backrest support member 7 is, for example, resin-molded, and is configured to have higher rigidity than the backrest 6 due to the thickness, size, 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. In addition, the said width direction is a direction over the right-and-left end part of the backrest board | substrate 21, and corresponds to the left-right direction in this 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 includes 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, a locking claw, and the like, and 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. 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 43a 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 brought into contact with each other from the rear. And having. 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 back of the seated person 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, so that the backrest substrate 21. 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. In addition, the structure which hold | maintained the upper end part of the center part 24 of the backrest 6 so that a movement in a height direction etc. was hold | maintained, and hold | maintained the lower end part of the center part 24 in the restraint state may be sufficient. Further, 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 configured to be 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 portion 41 is configured to move 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 is for moving the central portion 24 and both end portions 25 of the backrest 6 back and forth, and has a grip portion 51 that can be gripped by a seated person. The gripping part 51 improves the operability of the seated person, has a substantially L shape, protrudes to the side of the backrest 6, and can be gripped while the seated person is sitting on the seat body 4. ing.

  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. . In addition, on the other side of the opposing surfaces 26 and 34 of the backrest 6 and the backrest support member 7 (on the opposing surface 26 side in the present embodiment), as shown in FIG. An engagement groove 60 that can be engaged with the distal end portion 53 is formed.

  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 along the inclined shape below the protruding portion 23 of the backrest 6 ( (Left and right direction) 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 is configured to be divided into a first liner member 61a and a second liner member 61b. The 1st liner member 61a and the 2nd liner member 61b are comprised so that a combination with the uneven | corrugated fitting part 62 is possible.

  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 53 that engages with the engagement groove 60, and a proximal end 52 that is rotatably supported by the rotation shaft 69. The rotation 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 of the present embodiment enables the tip 53 to be moved in the width direction (left-right direction) along the engagement groove 60 by this play.

  While sitting on the seat body 4, the seated person 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 distal end portion 53 is rotated upward about the base end portion 52 (see FIG. 1). 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. It 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 load on the seated person can be increased 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 pushed by the operating member 50 and moved back and forth. The moving end portion 41 is provided at a position corresponding to the protruding portion 23 that bends forward of the backrest 6. Since the protrusion 23 is a part that affects the sitting comfort by supporting the waist of the seated person, the seating feeling of the seated person can be easily changed by moving the position corresponding to the protrusion 23 back and forth. For example, the lateral displacement of the seated person can be prevented by changing the curved shape of the backrest 6 so as to hold the waist of the seated person.

  Thus, according to the above-described embodiment, the backrest 6 having the receiving surface component 20 that receives the load in contact with the seated person, the backrest support member 7 that supports the backrest 6 from the back, and the backrest 6 By adopting a configuration in which the center portion 24 and the both end portions 25 in the width direction of the base plate are moved back and forth to change the curved shape of the receiving surface constituting portion 20, the backrest is adopted. Thus, the chair 1 that can greatly change the curved shape 6 and can suppress a decrease in the force to support the seated person is 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 that forms an outer edge portion thereof, and an opening that penetrates from the front surface (front surface) to the rear surface (rear surface) in the inner periphery 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 made 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 smaller than that of the outer peripheral frame portion 81 and is composed of a thin linear member 88 and a connecting portion 89 as compared with the outer peripheral frame portion 81. It is rich in flexibility and has a width direction (generally left-right direction) and a height direction (generally vertical direction) along the surface as the surface direction of the backrest substrate 21, and a direction perpendicular to the surface of the backrest substrate 21. Elastically deforms flexibly in the thickness direction (generally in the front-rear direction). 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 ensured by the outer peripheral frame portion 81 as a frame having a relatively high rigidity.

  The backrest substrate 21 including the outer peripheral frame portion 81 as a whole, and 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 pressing.

  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.

  Although the upper fixing portion may be completely fixed and the backrest 6 may be elastically deformed, the upper holding portion 42 is also 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. If the semi-fixed state is set as in the case of 43, the backrest 6 can easily move with respect to the backrest support member 7, and the operability of the operation member 50 becomes lighter.

  The backrest board 21 is generally rearward (anti-seat person side) in a plan view of FIG. 9 so that both end parts 25 in the width direction are located in front of the center part 24 in the width direction (seat person side). 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 a 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 continues to.

  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 board 21 described above is the shape of the front face on the seated person side, and the receiving surface constituting portion 20 is formed along the shape of the backrest board 21 so that it can be formed along the waist and back of the seated person. 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 protruding portion 23a greatly displaced forward, and the curvature of the planar view of the board protruding portion 23a is increased to support the seated person's waist in the left-right direction. ramp up. The backrest substrate 21 is also constrained at its upper end, and 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 of each linear body 88 in front view 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 to be smaller as the linear body 88 on the center side in the width direction.

  In the site | part (board | substrate protrusion part 23a) of the height in which the top part 88a of each linear body 88 is located, the number of the linear bodies 88 becomes the largest compared with the upper direction and the downward direction. When this portion is the lumbar portion (waist support portion) of the backrest substrate 21, the support load is increased by increasing the number of main beams (striate bodies 88) in the lumbar portion. Further, each of the three-dimensionally curved linear members 88 as described above is deformed with twisting so that the top portion 88a is tilted to the left and right central sides and rearward by a load from the front. Each linear body 88 is deformed with twisting so that the top portion 88a falls 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 portion 81. Have

  For this reason, the backrest board | substrate 21 deform | transforms flexibly especially in a lumbar part rather than the case where it deform | transforms so that each striate body 88 may just wake back with respect to the load from the front. Further, the curved shape of each linear member 88 is symmetric with respect to the center line CL in the width direction of the backrest substrate 21, and the number of main beams in the lumbar portion becomes denser due to the deformation accompanied by the twist. 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. A portion on the center side in the width direction of the substrate protruding portion 23a is a portion of the opening forming portion 86 that requires the most strength (a portion that receives the most load), and in the present embodiment, only the portion in the opening 87 is inside. The installation part 95 mentioned later is provided.

  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 member 88 appropriately changes the dimension t <b> 1 in the thickness direction of the backrest substrate 21 according to the portion of the backrest substrate 21. Specifically, the dimension t1 in the thickness direction of each linear member 88 is the largest in 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 made smaller 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. Further, the dimension t1 in the thickness direction of each linear member 88 is set to be larger toward the center side in the width direction and gradually smaller toward both end sides. The dimension t <b> 2 in the thickness direction of the connecting portion 89 is set to be small for any part of each of the filaments 88.

  When each striate body 88 receives a load from the seated person, it leaves both ends integrated with the outer peripheral frame part 81, and is deformed so as to form a back bay along the back of the seated person, 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 peripheral frame part 81 and the top part 88a that is most easily bent backward, but the thickness in the front-rear direction of the linear member 88 is large at the part. Therefore, the concentration of twisting deformation can be suppressed. Further, since the linear members 88 are connected to each other by the connecting portion 89 extending in the left-right direction, no step is generated between the linear members 88 that are twisted and deformed.

  With reference to FIGS. 8 and 12, the connecting portion 89 is disposed in each of the gap portions 91 on both sides in the width direction of the plurality of linear bodies 88, and extends from each linear body 88 in the width direction so that the linear bodies 88 are connected. It connects with the other linear body 88 or the outer periphery frame part 81 on both sides of the space | gap 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. In other words, the opening forming part 86 of the backrest substrate 21 is formed in a mesh shape by a plurality of linearly extending linear elements 88 and a connecting part 89 that connects adjacent linear elements 88.

  Here, each linear body 88 is comprised from the several linear body structure part 92 connected mutually in a height direction. Each linear structure part 92 inclines so that it may incline so that it may be located in the width direction center side, and the lower side may be located in the width direction outer side with respect to the said curve reference line k1 of each linear body 88. It is roughly divided into what to do. By alternately connecting the linear body constituting portions 92 that are inclined in different directions in the front view, each linear body 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. This occurs when the distance in the width direction between the portions is reduced.

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

  The plurality of connecting portions 89 that connect the pair of linear bodies 88 adjacent in the width direction 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. 92a is connected. Thereby, each opening part 87 formed by the linear body 88 and the connection part 89 is formed in the hexagon shape whose width | variety in a height direction intermediate part is larger than the width | variety in the height direction both ends. The width of the gap portion 91 between the pair of filaments 88 is smaller 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 height direction. It is formed in a long and long hexagonal shape. The mesh-shaped opening forming part 86 arranges hexagonal openings 87 formed by a frame-like linear body 88 and a connecting part 89 in a staggered manner, and these are arranged in a plane direction (height direction and width direction). It can be expanded and contracted.

  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. . Accordingly, 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. Then, 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 smaller 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 to be larger than that of the connecting portion 89, and strengthens the force that shrinks the opening 87 to the left and right. Moreover, since t3 of the connection part 89 of a lumbar part is larger than the connection part 89 of another site | part, the connection part 89 becomes closer to plate shape, and becomes easy to deform | transform into a surface direction more with respect to the load from the front.

  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 installation portion 95 extends vertically in the opening portion 87 having a hexagonal shape when viewed from the front, and is connected to the upper and lower ends of the opening portion 87 on the opening center line k3 overlapping the center line k2, as shown in FIG. It has upper and lower extending pieces 96 and a bending aid 97 provided between the upper and lower extending pieces 96.

  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 bent 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 a seated person. Further, as compared to the case where the bending facilitating portion 97 is composed of a single striate body, the bending facilitating portion 97 is disposed so as to spread in the opening portion 87, so that the sense of the seated person's body entering the opening portion 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 body of the seated person 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 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. Although the erection part 95 extends in the height direction of the opening part 87, the erection part 97 of the erection part 95 itself also follows the deformation of the opening part 87 in the height direction. 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 portion 87 via a pair of substantially coaxial extending pieces 96, so that the opening portion 87. Interacting with the deformation of the can be suppressed.

  In the lumbar portion where the erection portion 95 is provided, the seated person's body comes into contact more strongly. However, since the erection portion 95 provided in the opening portion 87 of the part also receives the load of the seated person, a part of the body becomes 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 an erection portion 95 (blocking portion) that does not hinder the deformation in the opening 87 only in a portion where the load on the backrest substrate 21 is easily received, a flexible seating feeling can be obtained in the upholstery type backrest 6. Even if the mesh of the backrest substrate 21 is made as coarse as possible (even if the opening 87 is enlarged), the cushion material and the seat covering material 22 are difficult to enter into the opening 87 where the load is easily received. There is no trace of the mesh of the backrest substrate 21 on the material 22.

  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 linear body 88 having a three-dimensional curved shape that protrudes forward and in the center in the width direction is flexibly deformed particularly in a lumbar portion where a portion having a large curve (the top portion 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 chair 1 of the above embodiment includes the backrest 6 having the receiving surface constituting portion 20 that receives a load in contact with the seated person, the backrest support member 7 that supports the backrest 6 from behind, Curved shape changing means 8 for changing 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 backrest 6 back and forth, and the backrest 6 in the backrest 6 The backrest substrate 21 of the receiving surface constituting part 20 is integrally formed inward of the both ends 25 in the width direction and elastically deforms in the width direction, thereby causing the relative movement of the receiving face constituting part 20. A deformation allowing portion (opening forming portion 86) that allows deformation is provided.
According to this configuration, when the curved shape of the receiving surface constituting part 20 is changed, the opening forming part 86 on the inner side in the width direction expands and contracts in the width direction to deform the receiving face constituting part 20 as a whole. For this reason, the local load to the site | part used as the starting point of a deformation | transformation of the receiving surface structure part 20 is suppressed, and the failure | damage by aged deterioration, etc. can be suppressed. Moreover, the deformation | transformation area | region of the receiving surface structure part 20 is easy to be expanded, and the deformation | transformation which wraps a seated person's back in the width direction is realizable.

The backrest substrate 21 includes an outer peripheral frame portion 81 that surrounds the periphery of the opening forming portion 86 and has higher rigidity than the opening forming portion 86, and the opening forming portion 86 includes the outer peripheral frame portion 81. A plurality of linear members 88 extending in the height direction of the backrest 6.
According to this configuration, the outer frame 81 having a relatively high rigidity is used as the skeleton of the receiving surface component 20, and the opening forming portion 86 is more easily deformed in the width direction, and the backrest 6 is strong and flexible. Can be configured.

In addition, at least one of the upper and lower end portions of the outer peripheral frame portion 81 is supported by the backrest support member 7 so as to be movable in the height direction.
According to this structure, the deformation | transformation of the height direction of the backrest board | substrate 21 accompanying the change of the curved shape of the backrest 6 is accept | permitted, and realization of the deformation | transformation which wraps a seated person's back in the width direction can be performed easily.

In addition, at least one of the plurality of striate bodies 88 includes a plurality of striate body constituting portions 92 that are connected to each other in the height direction, and each of the plurality of striate body constituting portions 92 It extends at a different angle with respect to the other striate body constituting part 92 connected to at least one of the above.
According to this configuration, since the linear member 88 includes a portion in which the linear member constituting portions 92 having different angles are connected, the deformation of the backrest 6 when the linear member 88 operates the curved shape changing means 8. Accordingly, the backrest 6 can be easily deformed even when it extends in the height direction.

Moreover, each of a pair of said linear body 88 adjacent in the said width direction has the said linear body structure part 92 which inclines so that it may mutually be symmetrical on both sides of the centerline k2 between these.
According to this configuration, when the curved shape changing means 8 is operated by the pair of or more linear members 88, an area that can be expanded and contracted in the height direction is formed, and the backrest 6 can be more easily deformed.

In addition, the gaps 91 on both sides in the width direction of each of the plurality of line bodies 88 extend from the line bodies 88 in the width direction so that the line bodies 88 are opposed to each other across the space 91. A connecting portion 89 to be connected is formed, and the connecting portion 89 has different positions in the height direction on both sides in the width direction of the linear members 88.
According to this structure, while suppressing the excessive deformation | transformation of each linear body 88 by the connection part 89, it prevents the connection part 89 from continuing in the width direction, and can implement | achieve the deformation | transformation of moderate backrest 6. FIG.

In addition, a plurality of the connecting portions 89 are formed at equal intervals in the height direction, and are arranged in a staggered manner throughout the opening forming portion 86, and the opening forming portion 86 includes the plurality of linear bodies 88 and A plurality of openings 87 arranged in a zigzag manner are formed by the plurality of connecting portions 89.
According to this configuration, the plurality of linear members 88 and the connecting portions 89 are arranged in a mesh shape to form the opening forming portion 86 in which the plurality of opening portions 87 are formed, and the opening is formed when the curved shape changing means is operated. Flexible deformation of the entire forming unit 86 can be realized.

Each of the plurality of striatum bodies 88 is configured by a plurality of striatum body configuration portions 92 that are connected to each other in the height direction, and each of the plurality of striatum body configuration portions 92 is at least above and below it. Each of the pair of linear bodies 88 adjacent to each other in the width direction extends in a different angle with respect to the other linear body constituent part 92 connected to one side, meandering each linear body 88, The plurality of connecting portions 89 that are formed symmetrically with respect to the center line k <b> 2 and connect between the pair of linear bodies 88 are configured to form the linear bodies in each of the pair of linear bodies 88. The end portions 92a adjacent to each other in the width direction of the portion 92 are connected.
According to this configuration, each opening 87 formed by the plurality of filaments 88 and the connecting portion 89 has a hexagonal shape in which the width at the middle portion in the height direction is larger than the width at both ends in the height direction. When the backrest 6 is deformed in the height direction when the curved shape changing means is operated, the opening 87 extends in the height direction so as to constrict the height direction intermediate portion in the width direction. The backrest 6 when the shape changing means is operated can be more easily deformed.

Further, the plurality of connecting portions 89 change the height dimension t <b> 3 according to the position of the backrest 6.
According to this configuration, the dimension t3 in the height direction of the connecting portion 89 can be made larger at the predetermined portion of the backrest 6 than the other portions to increase the rigidity, so that the back when the curved shape changing means is operated. If a highly rigid connecting portion 89 is arranged at a portion of the drooping 6 that is desired to be greatly deformed, the connecting portion 89 pushes the linear member 88 in the width direction and extends the opening 87 in the height direction, and the bending is increased. The backrest 6 can be more easily deformed when the shape changing means is operated.

In addition, at least one of the plurality of linear members 88 is positioned such that an intermediate portion in the height direction is located closer to a center side in the width direction than both ends connected to the outer peripheral frame portion 81 in the height direction. Bend or bend.
According to this structure, when the both ends 25 in the width direction of the backrest 6 when the curved shape changing means is operated are moved relative to the central portion 24 in the width direction, the linear body 88 is entirely raised. It is easy to elastically deform in the direction, and the backrest 6 can be more easily deformed.

  In addition, this invention is not restricted to the said embodiment, For example, a lumbar support, a headrest, etc. other than the seat body 4 and the backrest 6 may be sufficient as a load support member. The load support member is not limited to one in which the backrest substrate 21 constitutes a part of the load support member by providing the backrest substrate 21 with a cushioning material, a skin, and the like, and the backrest substrate 21 constitutes the entire load support member. You may do. 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.
The above-described configuration is an example of the present invention, and various modifications can be made without departing from the gist of the invention.

DESCRIPTION OF SYMBOLS 1 Chair 6 Backrest 7 Backrest support member 8 Curved shape change means 20 Reception surface structure part 21 Backrest board (board | substrate)
24 Central part 25 Both ends 81 Peripheral frame part 86 Opening formation part (deformation allowable part)
87 Opening 88 Linear body 89 Connection part 91 Space | gap part 92 Linear body structure part 92a End part k2 Center line t3 The dimension of a height direction

Claims (10)

A backrest having a receiving surface component that receives a load in contact with a seated person;
A back support member that supports the back from behind;
In a chair comprising: a curved shape changing means for changing the curved shape of the receiving surface constituent part by relatively moving the center part and both end parts in the width direction of the backrest back and forth.
The substrate of the receiving surface constituting portion in the backrest is integrally formed inward from both ends in the width direction and elastically deformed in the width direction, thereby deforming the receiving surface constituting portion by the relative movement. Equipped with a deformation allowing portion that allows
The curved shape changing means rotates around the base end portion, a base end portion rotatably supported on either one of the backrest and the opposed surfaces of the backrest support member facing each other, A chair comprising: an operating member having a backrest and a tip portion that presses the other side of the opposite surface of the backrest support member . The substrate includes an outer peripheral frame portion that surrounds the periphery of the deformation permissible portion and has higher rigidity than the deformation permissible portion,
The chair according to claim 1, wherein the deformation allowing portion includes a plurality of linear bodies extending in the height direction of the backrest inside the outer peripheral frame portion.   The chair according to claim 2, wherein at least one of the upper and lower end portions of the outer peripheral frame portion is supported by the backrest support member so as to be movable in the height direction. At least one of the plurality of striatums has a plurality of striatum components that are connected to each other in the height direction,
4. The chair according to claim 2, wherein each of the plurality of striatum components extends at a different angle with respect to another striatum component connected to at least one of the upper and lower sides thereof.   Each of the pair of said linear bodies adjacent in the said width direction has the said linear body structure part which inclines so that it may mutually become symmetrical on both sides of the centerline between these, It is characterized by the above-mentioned. The listed chair. In the gap portions on both sides in the width direction of each of the plurality of linear bodies, connecting portions that extend in the width direction from the respective linear bodies and connect the linear bodies to the other side across the gap portions are formed. And
The chair according to any one of claims 2 to 5, wherein the connecting portion changes the position in the height direction on both sides in the width direction of each of the linear bodies. A plurality of the connecting portions are formed at equal intervals in the height direction, and are arranged in a staggered manner throughout the deformation allowing portion,
The chair according to claim 6, wherein the deformation permitting portion forms a plurality of openings arranged in a zigzag manner as a whole by the plurality of linear bodies and the plurality of connecting portions. Each of the plurality of striatums is composed of a plurality of striatum components connected to each other in the height direction,
Each of the plurality of striatum components extends at a different angle with respect to the other striatum components connected to at least one of the upper and lower sides thereof, meandering each striatum,
Each of the pair of linear bodies adjacent in the width direction is formed so as to be symmetric with respect to each other with a center line therebetween.
The plurality of connecting portions that connect between the pair of striated bodies connect between end portions that are adjacent to each other in the width direction of the striated body constituting portion in each of the pair of striated bodies. A chair according to any one of claims 2 to 7, characterized in that   The chair according to any one of claims 6 to 8, wherein the plurality of connecting portions change a dimension in the height direction according to a position of the backrest.   At least one of the plurality of linear bodies is curved so that an intermediate portion in the height direction is located on a center side in the width direction with respect to both ends connected to the outer peripheral frame portion in the height direction. The chair according to any one of claims 2 to 9, wherein the chair is bent.

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