JP5593524B2 - Chair - Google Patents

Description

  The present invention relates to a chair suitably used, for example, in a school, a conference hall, an office meeting room, or the like.

  This type of chair is often deployed in large quantities. From the viewpoint of reducing the storage space of these chairs, the seat plate can be turned up and down, and a structure capable of performing nesting (horizontal stacking) in which a plurality of units are stacked in the front-rear direction while the seat plate is flipped up is used. It is known (see, for example, the following patent document).

  In order to improve the sitting comfort of the chair, it is desirable to make the seating surface deformable. However, in the conventional chair, in order to avoid inconveniences such as the front portion of the seat plate having a substantially horizontal posture hanging down in use, the seat plate is exclusively configured as a rigid body that does not deform firmly.

JP 2006-158745 A JP 2006-158746 A

  An object of the present invention is to improve the sitting comfort while suppressing the manufacturing cost in a chair capable of flipping up a seat.

The chair according to the present invention is provided with a resin seat plate so that it can be rotated up and down around a support shaft of a chair body having a support shaft with its axis oriented in the left-right direction. A support frame disposed on the lower surface side of the plate and engaged with the support shaft so as to be vertically rotatable, and the seat plate is displaced in the thickness direction when the seat plate is used in a substantially horizontal state (or The front part and the rear part of the seat plate are supported by the support frame so that the front part of the seat plate supports the front part of the seat plate in the support frame. It is characterized by being relatively slidable . In addition, the chair according to the present invention is a chair provided with a resin seat plate so that it can be rotated up and down around a support shaft of a chair body having a support shaft with its axis oriented in the left-right direction, A support frame disposed on the lower surface side of the seat plate and engaged with the support shaft so as to be vertically rotatable is provided, and the intermediate portion of the seat plate is displaced in the thickness direction when the seat plate is used in a substantially horizontal state. The front and rear portions of the seat plate are supported by the support frame so that a mounting body projecting downward is integrally formed on the front and rear portions of the seat plate. Has side plates which make a pair on the left and right, and both side plates sandwich the mounting body. If it is such, even if the seat board itself is imparted with deformability, the strength and function of the structure as a chair can be ensured by supporting the front and back with a support frame.

  The chair body includes a horizontal member disposed in front of the support shaft and extending in the left-right direction, and a front support portion and a seat plate that support the front portion of the seat plate in the support frame in the use state. If the portion between the rear support portion that supports the rear portion is placed on the horizontal member, the seat plate and the support frame can be firmly supported by the support shaft and the horizontal member.

  In the support frame, a recess is formed in a portion between a front support portion that supports the front portion of the seat plate and a rear support portion that supports the rear portion of the seat plate. If the recessed portion is engaged with the horizontal member from above, rattling of the support frame with respect to the horizontal member in the use state can be suppressed.

  If the part between the front support part supporting the front part of the seat plate in the support frame and the rear support part supporting the rear part of the seat plate is spaced downward from the lower surface of the seat plate, the seating It is more preferable that an intermediate portion of the seat plate that receives the weight of the person is allowed to bend and deform in the thickness direction in the gap between the seat plate and the support frame.

  If the support shaft is sandwiched between the rear portion of the seat plate and the rear support portion that supports the rear portion of the seat plate in the support frame, the seat plate and the support frame can be attached to the support shaft of the chair body in a simple procedure. Can be assembled.

  If the front portion of the seat plate is slidable relative to the front support portion that supports the front portion of the seat plate in the support frame, the intermediate portion of the seat plate is bent and deformed in the thickness direction. The structural contradiction that occurs between the seat plate and the chair body is absorbed, and the bending deformation of the seat plate is not hindered.

  Two sets of the support frames are provided, the left front part and the left rear part of the seat plate are supported by one support frame, and the right front part and the right rear part of the seat plate are supported by the other support frame. If so, the seat plate can be supported at four points in use and stable.

  A mounting body protruding downward is integrally formed on the front and rear portions of the seat plate, the support frame has side plates that make a pair on the left and right, and both side plates sandwich the mounting body. If so, the structure of the support frame and the assembly process are further simplified.

  In particular, the present invention can be suitably applied to a chair having a mode in which a plurality of bases can be nested in the front-rear direction in a state in which the seat plate and the support frame are turned up and flipped up.

  In addition, it is also preferable to add various devices to the seat plate for the purpose of imparting deformability to the seat plate. For example, a portion including the front and rear portions supported by the support frame in the seat plate is defined as a rigid region, and a thin portion, groove, slit, bottomed hole, through-hole, or deformable region other than the rigid region. A strip-shaped member is provided to make the deformation region more easily elastically deformable than the rigid region.

  Or you may make it connect between the front part or the rear part supported by the said support frame in the said seat board, and the site | part in which a seated person's buttocks are mounted by the elastically deformable resin spring.

  ADVANTAGE OF THE INVENTION According to this invention, in the chair of the aspect which can flip up a seat, the seating comfort can be improved, suppressing manufacturing cost.

The perspective view which looked at the chair of one embodiment of the present invention from the front side. The perspective view which looked at the chair of the embodiment from the bottom side. The perspective view which shows the non-use state which flipped up the seat of the chair of the embodiment. The sectional side view of the chair of the embodiment. The bottom view of the chair of the embodiment. The disassembled perspective view which shows the seat plate and support frame of the embodiment. The side view which shows the state which nested the chair of the embodiment. The principal part side sectional view which shows one of the modification of a seat plate and a support frame. The principal part side sectional view which shows one of the modification of a seat plate and a support frame. The top view which shows one of the modifications of a seat board. The principal part expanded sectional view which shows typically the cross-sectional shape in the XX line of FIG. The principal part expanded sectional view which shows typically the cross-sectional shape in the XX line of FIG. The principal part expanded sectional view which shows typically the cross-sectional shape in the XX line of FIG. The principal part expanded sectional view which shows typically the cross-sectional shape in the XX line of FIG. The principal part expanded sectional view which shows typically the cross-sectional shape in the XX line of FIG. The principal part expanded sectional view which shows typically the cross-sectional shape in the XX line of FIG. The principal part expanded sectional view which shows typically the cross-sectional shape in the XX line of FIG. The principal part expanded sectional view which shows typically the cross-sectional shape in the XX line of FIG. The perspective view seen from the bottom face side which shows one of the modifications of a seat board. The bottom view which shows the state which removed the upholstery material from the seat board of the modification. The perspective view seen from the bottom face side which shows the state which removed the tension material from the seat board of the modification. The bottom view which shows the state which removed the upholstery material from the seat board of the modification. The exploded perspective view which looked at the seat board of the modification from the bottom side. The top view which shows one of the modifications of a seat board. The perspective view of the seat plate of the modification. The perspective view which looked at the seat plate of the modification from the bottom side. The principal part expanded sectional view which shows typically the cross-sectional shape in the YY line of FIG. The principal part expanded sectional view which shows typically the cross-sectional shape in the ZZ line | wire of FIG. The perspective view which looked at the seat plate of the modification from the bottom side. The principal part expanded sectional view which shows typically the cross-sectional shape in the YY line of FIG. The perspective view which shows one of the modification of a seat board, and the chair to which this is applied. The perspective view which looked at the seat board of the modification, and the chair which applied this from the bottom side. The principal part expansion perspective view which looked at the seat board of the modification from the bottom face side. The top view which shows one of the modifications of a seat board. The perspective view of the seat plate of the modification. The top view of the seat plate of the modification. The top view which shows one of the modifications of a seat board. The perspective view of the seat plate of the modification. The top view of the seat plate of the modification. The principal part enlarged plan view of the seat board of the modification. The principal part expansion perspective view of the seat board of the modification.

  An embodiment of the present invention will be described with reference to the drawings. The chair according to the present embodiment is formed by attaching a seat plate 1 and a back plate 2 which are resin molded products to a chair body, and the seat plate 1 can be turned up and down. 1, 2, 4 to 6 show a use state in which the seat plate 1 is substantially horizontal, and FIGS. 3 and 7 show a non-use state in which the seat plate 1 is flipped up.

  The chair body is a self-supporting structure that supports the seat plate 1 and the back plate 2. The chair body can be broadly divided into a seat receiving portion that is a structure that supports the seat plate 1 and a leg portion that is a structure that supports the seat receiving portion and the back plate 2.

  The seat receiving portion extends in the front-rear direction, and includes a rear frame 4 that serves as a support shaft with its axis oriented in the left-right direction, a front frame 5 that is disposed in front of the rear frame 4 and extends in the left-right direction, and a horizontal frame. The side frame 6 that supports the side end portions of the rear frame 4 and the front frame 5 and the support frame 3 that engages the rear end portion with the rear frame 4 so as to be vertically rotatable are used as elements.

  Each of the rear frame 4 and the front frame 5 is mainly composed of a round pipe material, and extends to the left and right so as to be substantially parallel to each other.

  The left and right side frames 6 are mainly composed of a round pipe material having a diameter slightly larger than that of the rear frame 4 and the front frame 5, and are inclined so as to descend toward the front. Further, the distance between the left and right side frames 6 is gradually reduced toward the front. Both ends of the rear frame 4 and both ends of the front frame 5 are fixed to the left and right side frames 6 by welding or the like. The height position of the front frame 5 is slightly lower than the height position of the rear frame 4.

  The support frame 3 is mainly composed of a side plate 31 made of sheet metal that is paired on the left and right sides, and rotates up and down around the rear frame 4 together with the seat plate 1 while supporting the seat plate 1. In the present embodiment, two sets of support frames 3 are provided, and each support frame 3 is separately arranged so as to be positioned near the middle between the center in the left-right direction and the outer end of the seat plate 1. The support frame 3 supports the front portion of the seat plate 1 by the front support portion 33 and supports the rear portion of the seat plate 1 by the rear support portion 34. The front support portion 33 and the rear support portion are supported. The intermediate part 112 between the part 34 is separated from the lower surface of the seat plate 1.

  Specifically, as shown in FIG. 6, the pair of side plates 31 constituting the support frame 3 have substantially the same shape. As shown in FIG. 4, when the seat plate 1 is used in a substantially horizontal state, the front end portion 33 and the rear end portion 34 of each side plate 31 protrude upward so as to face the lower surface of the seat plate 1. The front end portion 33 of the side plate 31 serves as a support portion on the front side of the support frame 3, and the rear end portion 34 of the side plate 31 serves as a support portion on the rear side of the support frame 3. The front end portions 33 of the both side plates 31 are in contact with the left and right side surfaces of the mounting body 12 on the front side of the seat plate 1 to be described later, and sandwich the front mounting body 12 from the left and right. The rear end portions 34 of the side plates 31 are in contact with the left and right side surfaces of the mounting body 13 on the rear side of the seat plate 1 and sandwich the rear mounting body 13 from the left and right sides.

  The upper edge of the side plate 31 descends away from the lower surface of the seat plate 1 as it goes rearward from the rear edge of the front support portion 33, and turns upward in the vicinity of the front frame 5. This leads to the front edge of the support portion 34. Similarly, the lower edge of the side plate 31 also descends toward the rear from the front edge of the front support portion 33 and turns upward when the front frame 5 is crossed. Continue to the edge. Insertion holes 331 and 341 penetrating the side plate 31 in the left-right direction are provided at predetermined locations on the front support portion 33 and on the rear support portion 34, respectively. The front edge of the front support portion 33 and the rear edge of the rear support portion 34 are cut off obliquely.

  In the state of use, a portion between both support portions in the support frame 3 is placed on the front frame 5. A concave portion 32 that is opened downward is formed in advance in the portion, and the concave portion 32 is engaged with the front frame 5 from above in the state of use, and the back frame 4 and the front frame 5 are loose with respect to the support frame 3. Suppresses stickiness. The recessed portion 32 has a substantially upper semicircular shape corresponding to the outer peripheral surface of the frame 5 when viewed from the side.

  Further, the rear support portion 34 also serves as a part of a bearing that passes through the rear frame 4. Therefore, a notch 342 opened upward, which is a part of the bearing hole, is formed in the rear end portion 34 of each side plate 31. The notch 342 has a substantially lower semicircle corresponding to the outer peripheral surface of the frame 4 after side view.

  The leg portion includes a front leg 7 and a rear leg 8 which are paired on the left and right sides, and a back frame 9 which is also paired on the left and right sides.

  The front leg 7 is integrally continuous from the front ends of the left and right side frames 6, and is bent or curved forward and downward from the front ends of the side frames 6. The vicinity of the lower end of the front leg 7 faces vertically downward, and a caster 71 is attached to the lower end.

  Like the side frame 6 and the front leg 7, the rear leg 8 is mainly composed of a round pipe material. The rear leg 8 extends vertically while taking a slightly forward inclined posture. The vicinity of the lower end of the rear leg 8 is also directed vertically downward, and a caster 81 is attached to the lower end thereof. The distance between the left and right rear legs 8 gradually increases toward the bottom. That is, the left and right rear legs 8 have a generally square shape when viewed from the front. The rear ends of the left and right side frames 6 are fixed to the upper ends of the left and right rear legs 8 by welding or the like.

  The back frame 9 is integrally continuous from the upper ends of the left and right rear legs 8 and extends straight as it is. The back plate 2 is attached to the upper end portion of the back frame 9.

  As shown in FIG. 6, the seat plate 1 is a resin-integrated member including a seat plate main body 11 and attachment bodies 12 and 13 projecting from the lower surface of the peripheral edge 111 of the seat plate main body 11. It is. In this embodiment, except for the attachment bodies 12 and 13, both the peripheral edge portion 111 and the intermediate portion 112 of the seat plate body 11 have substantially the same thickness dimension, and form a continuous seating surface. At least the intermediate portion 112 of the seat plate main body 11 can be bent and deformed in the thickness direction under the load of the seated person. The front end portion of the seat plate body 11 is slightly curved downward.

  The attachment bodies 12 and 13 protrude downward from the lower surface of the seat plate main body 11. The front mounting body 12 is provided on the lower surface of the front edge portion of the front portion of the seat plate body 11, that is, the peripheral edge portion 111. The rear attachment body 13 is provided on the lower surface of the rear edge portion of the rear portion of the seat plate main body 11, that is, the peripheral edge portion 111. The front attachment body 12 and the rear attachment body 13 are parts sandwiched from the left and right by the side plates 31 that constitute the support frame 3. The attachment bodies 12 and 13 are integrally formed on the resin seat body 11.

  The front mounting body 12 is formed in a block shape in which the left and right side surfaces extend in the front-rear direction substantially parallel to each other. The front attachment body 12 has an attachment hole 121 that opens to the side surface. In the illustrated example, the mounting hole 121 passes through the front mounting body 12 in the left-right direction, but the mounting hole 121 is not necessarily a through hole. The mounting hole 121 of the front mounting body 12 is a long hole expanded in the front-rear direction. The front surface of the front mounting body 12 is cut off obliquely. The side surface of the boundary portion joined to the upper portion 122 of the front mounting body 12, in other words, the lower surface of the seat plate 1 protrudes to the left and right than the side surface of the lower portion 123 below.

  The rear mounting body 13 is located behind the front mounting body 12 and is shaped so that the left and right side surfaces are substantially flush with the left and right side surfaces of the front mounting body 12, respectively. The rear attachment body 13 also has an attachment hole 131 that opens to the side surface. In the illustrated example, the mounting hole 131 penetrates the rear mounting body 13 in the left-right direction, but the mounting hole 131 is not necessarily a through-hole. Unlike that of the front mounting body 12, the mounting hole 131 of the rear mounting body 13 is not expanded in the front-rear direction. The rear surface of the rear mounting body 13 is cut off obliquely. The upper part 132 of the rear mounting body 13, in other words, the side surface of the upper half including the boundary portion joined to the lower surface of the seat plate 1 protrudes to the left and right than the side surface of the lower part 133 below it.

  The rear attachment body 13 and the rear support portion 34 of the support frame 3 constitute a bearing through which the rear frame 4 is inserted. Therefore, a concave groove 134 that opens downward and is a part of the bearing hole is formed in the rear mounting body 13. The concave groove 134 is recessed upward from the lower surface of the mounting body 13 on the rear side as viewed from the side while maintaining a constant front and rear inner dimension substantially equal to the diameter of the rear frame 4, and the outer peripheral surface of the rear frame 4 at its upper end. It has a substantially upper semicircle corresponding to Due to the presence of the concave groove 134, the rear mounting body 13 has a shape like a triumphal arch in a side view.

  When the support frame 3 is assembled to the lower surface side of the seat plate 1, the attachment bodies 12 and 13 arranged in the front and rear are sandwiched from the left and right by the pair of side plates 31 constituting the support frame 3, and the fastening device 35 is inserted in the insertion hole 331 in that state. , 341 and the mounting holes 121 and 131 are inserted from the side and fixed to the side plate 31. That is, the front end portion 33 of the side plate 31 is brought into contact with and fixed to the side surface of the lower portion 123 of the front mounting body 12 and the rear end portion 34 of the side plate 31 is pressed against the side surface of the lower portion 133 of the rear mounting body 13. Make contact and fasten. The fastening tool 35 is, for example, a pin, a rivet, a bolt, or the like.

  In the present embodiment, one fastener 35 is used for one attachment body 12, 13. When the side plate 31 is fixed to the attachment bodies 12 and 13, the upper end edge of the front end portion 33 of the side plate 31 is in contact with or in close proximity to the downward surface of the upper portion 122 of the front attachment body 12. Similarly, the upper end edge of the rear end portion 34 of the side plate 31 is in contact with or in close proximity to the downward surface of the upper portion 132 of the attachment body 13 on the rear side. Thereby, the side plate 31 is appropriately positioned with respect to the attachment bodies 12 and 13.

  As already described, the mounting hole 121 provided in the mounting body 12 on the front side of the seat plate 1 is a long hole extended in the front-rear direction. Therefore, the attachment body 12 on the front side of the seat plate 1 can slide back and forth relative to the support portion 33 on the front side of the support frame 3. Through this back-and-forth slide, bending deformation in the thickness direction of the intermediate portion 112 of the seat plate 1 is allowed.

  Further, in the present embodiment, the support portion 34 on the rear side of the support frame 3 and the attachment body 13 on the rear side of the seat plate 1 are provided so as to rotate the seat plate 1 and the support frame 3 about the rear frame 4 of the chair body. The rear frame 4 is sandwiched from above and below (or front and back). More specifically, the rear frame 4 is inserted in advance into the concave groove 134 of the rear mounting body 13, and then the rear end portion 34 of the side plate 31 is fixed to the rear mounting body 13 to thereby form the concave portion. The lower part of the groove 134 is closed to prevent the rear frame 4 from being pulled out. The peripheral surface of the mounting body 13 on the rear side and the inner periphery of the notch 342 in the rear end portion 34 of the side plate 31 form a bearing hole having a substantially circular shape when viewed from the side, and support the rear frame 4.

  According to this embodiment, it has a chair main body which has the spindle 4 which turned the axial center to the left-right direction, and the resin seat board 1 which can be rotated up and down around the spindle 4 of this chair main body. The chair body includes a support frame 3 that is disposed on the lower surface side of the seat plate 1 and has a rear end engaged with the support shaft 4 so as to be rotatable up and down, and the seat plate 1 is used in a substantially horizontal state. Since the chair supporting the peripheral portion 111 of the seat plate 1 by the support frame 3 is configured so that the intermediate portion 112 of the seat plate 1 can be displaced in the thickness direction, that is, bent, the seat plate 1 itself Flexibility can be imparted to the chair, and the sitting comfort as a chair is improved. Since it is not necessary to attach a foamed urethane cushion to the seat plate 1 or to make the seat plate 1 into a hollow frame body and to provide a stretchable mesh ground in the inner space, the number of members and assembly man-hours can be increased. Without inviting, it can greatly contribute to the suppression of the manufacturing cost of this type of chair, which is intended for mass production and sales. In addition, the seat plate body 11 made of substantially resin is higher in strength than those of the cushion type or mesh type, and is less likely to be torn, cut, or rubbed and worn. Since the mesh base is a member made of knitted or woven thin thread, if part of it frays, the fray can spread over the whole, but if the resin seat plate body 11 is partly damaged, It does not spread throughout. If it is the chair of this embodiment, it is suitable also for the use in a school etc.

  The chair body includes a horizontal member 5 that is disposed in front of the support shaft 4 and extends in the left-right direction, and supports the front side of the seat plate 1 in the support frame 3 in the use state. Since the portion between the portion 33 and the rear support portion 34 that supports the rear portion of the seat plate 1 is placed on the horizontal member 5, the seat plate 1 and the support frame 3 are connected to the support shaft 4 and the horizontal member. 5 and can be supported more firmly.

  A recessed portion 32 is formed at a portion between the support portion 33 on the support frame 3 that supports the front portion of the seat plate 1 and the support portion 34 on the rear side that supports the rear portion of the seat plate 1, Since the recessed portion 32 is engaged with the horizontal member 5 from above in the use state, rattling of the support frame 3 with respect to the horizontal member 5 in the use state can be suppressed.

  The portion of the support frame 3 between the front support portion 33 that supports the front portion of the seat plate 1 and the rear support portion 34 that supports the rear portion of the seat plate 1 is spaced downward from the lower surface of the seat plate 1. Therefore, it is more preferable that the intermediate portion 112 of the seat plate 1 receiving the weight of the seated person is allowed to bend and deform in the thickness direction in the gap between the seat plate 1 and the support frame 3.

  Since the support shaft 4 is sandwiched between the rear portion of the seat plate 1 and the rear support portion 34 that supports the rear portion of the seat plate 1 in the support frame 3, the seat plate 1 and the support frame 3 can be attached by a simple procedure. It can be assembled to the support shaft 4 of the chair body.

  Since the front portion of the seat plate 1 can slide relative to the front support portion 33 that supports the front portion of the seat plate 1 in the support frame 3, the intermediate portion 112 of the seat plate 1 has a thickness direction. The structural contradiction that occurs between the seat plate 1 and the chair body when the seat plate 1 is bent and deformed is absorbed, and the bending deformation of the seat plate 1 is not hindered.

  Two sets of the support frames 3 are provided, the left front portion and the left rear portion of the seat plate 1 are supported by one support frame 3, and the right front portion and the right rear portion of the seat plate 1 are supported by the other. Since it is supported by the frame 3, the seat plate 1 can be supported at four points in a use state and is stable.

  Mounting bodies 12 and 13 projecting downward are integrally formed on the front and rear portions of the seat plate 1, the support frame 3 has side plates 31 that make a pair on the left and right sides, It is assumed that the attachment bodies 12 and 13 are sandwiched, and the structure and assembly process of the support frame 3 are further simplified.

  Thus, the chair of the present embodiment is such that the front leg 7 and the seat receiving portion are laterally smaller than the distance between the left and right rear legs 8, and the seat plate 1 and the support frame 3 are rotated upward. It is possible to perform nesting in which the front leg 7 and the seat receiving portion of one chair are inserted between the rear legs 8 of the other chair after being flipped up.

  The present invention is not limited to the embodiment described in detail above. In the above embodiment, a gap is interposed between the lower surface of the intermediate portion 112 of the seat plate 1 and the upper edge of the support frame 3, but elastic deformation is caused between the intermediate portion 112 of the seat plate 1 and the support frame 3. A possible member (this member may be part of the seat plate 1 or part of the support frame 3) may be arranged so that no gap is provided between them.

  In the above embodiment, the seat plate 1 is completely exposed and the seat surface is formed by the seat plate 1 itself. However, the seat plate 1 is covered with a tension member, or the upper surface of the seat plate 1 is covered. It does not preclude wearing a cushioning material on.

  In the above embodiment, the front portion (front mounting body 12) of the seat plate 1 can be slid relative to the front support portion 33 of the support frame 3, but the seat plate can be reversed or combined with this. Needless to say, the rear portion (rear attachment body 13) of the first frame may be slidable relative to the rear support portion 34 of the support frame 3.

  As shown in FIG. 8, the front portion (front mounting body 12) of the seat plate 1 may be rotatable relative to the front support portion 33 of the support frame 3 and / or the seat plate 1. The rear portion (rear attachment body 13) may be rotatable relative to the rear support portion 34 of the support frame 3.

  The center of rotation of the support frame 3 relative to the support shaft 4 is not limited to the rear end portion of the support frame 3. As shown in FIG. 8, in the support frame 3, a bearing 36 that engages with the support shaft 4 may be formed at a location different from the rear support portion 34 that supports the rear portion of the seat plate 1. . In the example shown in FIG. 8, the bearing 36 is biased forward from the rear support portion 34 and is located in a region between the front support portion 33 and the rear support portion 34.

  In the embodiment described above, the portion of the support frame 3 that is placed on the horizontal member 5 is the recessed portion 32 that is recessed upward. However, as shown in FIG. It is good also as the protrusion part 37 which protrudes below.

  As shown in FIG. 9, it is also conceivable to integrally mold the seat plate 1 and the support frame 3 that supports the seat plate 1. In this case, not only the seat plate 1 but also the support frame 3 can be elastically deformed. If the seat plate 1 and the support frame 3 form a loop shape in a side view, the entire loop can be elastically deformed. Since both the seat plate 1 and the support frame 3 receiving the load of the seated person bend, the seat surface can be remarkably deformed, and the sitting comfort is further improved.

  Moreover, it is also preferable to add various devices for the purpose of imparting deformability to the seat plate 1. Hereinafter, examples A, B, C, D, E, and F of seat boards that can be applied to the chair according to the present invention will be listed.

  A seat plate A shown in FIGS. 10 and 11 is a resin-integrated member including a seat plate main body A1 and an attachment body (not shown) protruding from the lower surface of the seat plate main body A1.

  The seat plate main body A1 has a peripheral portion (in other words, a peripheral region) A11 and an intermediate portion A12 located inside the peripheral portion A11.

  The peripheral edge portion A11 includes a side portion (in other words, a side edge portion) A111 located on the left and right sides of the intermediate portion A12, and a front portion (in other words, a front edge portion) A112 located on the front side of the intermediate portion A12. And a rear portion (in other words, a rear edge portion) A113 located on the rear side of the intermediate portion A12. The support frame 3 of the chair body supports the front part A112 and the rear part A113.

  The intermediate portion A12 is provided on the inner side of the peripheral portion A11 and is provided to connect the inner region A121 that is displaced with respect to the chair body when the weight is applied, and the peripheral portion A11 and the inner region A121. And a connection region A122 having a smaller thickness than the inner region A121.

  That is, the seat board main body A1 is configured such that when the weight is applied to the inner area A121, at least the connection area A122 is deformed, so that the inner area A121 is displaced in the thickness direction of the seat board A with respect to the peripheral edge A11. It is configured. The inner region A121 is formed integrally with the front portion A112 of the peripheral edge portion A11, and has substantially the same thickness as the peripheral edge portion A11. The upper surface of the inner region A121 is set to be substantially flush with the upper surface of the peripheral edge portion A11 in the no-load state.

  The connection region A122 connects the opposing end portions A114 and A123 of the peripheral edge portion A11 and the inner region A121, and is curved so as to protrude in the plate thickness direction, that is, downward. In FIG. 11 (in addition, FIGS. 12 to 18), for convenience of explanation, the peripheral portion A11 and the inner region A121 are hatched differently. However, the connection region A122 includes the peripheral portion A11 and the inner region A121. Are integrally molded using the same resin.

  The connection region A122 has a shape that surrounds the inner region A121 in a substantially U-shape opening forward in plan view. Further, the connection region A122 has the same cross-sectional shape in each part, and the lower surface of the connection region A122 is the lower surface in the vicinity of the end portion A114 (facing the connection region A122) of the peripheral portion A11, and the inner region A121 ( It projects downward from any one of the lower surfaces in the vicinity of the end A123 (facing the connection region A122). In the example shown in FIG. 11, the connection region A122 has a U-shaped cross section that protrudes downward beyond the lower surface of the peripheral edge portion A11 and the lower surface of the inner region A121.

  A mounting body takes the structure similar to the mounting bodies 12 and 13 of the seat board 1 in the said embodiment. A front attachment body (not shown) is provided on the lower surface of the front portion A112 of the peripheral edge portion A11, and a rear attachment body (not shown) is provided on the lower surface of the rear portion A113 of the peripheral edge portion A11. Attachment of the seat plate A1 to the chair body can also be performed in the same manner as in the above embodiment. That is, the attachments provided on the lower surface of the front portion A112 and the lower surface of the rear portion A113 are supported by the front support portion 33 and the rear support portion 34 of the support frame 3, respectively. At this time, the peripheral edge portion A11 including the front portion A112 and the rear portion A113 supported by the support frame 3 is a rigid region. And connection area | region A112 which is a thin part thinner than peripheral part A11 is provided in site | parts other than this peripheral part A11, and this connection area | region A112 turns into a deformation | transformation area | region where elastic deformation is easier than peripheral part A11. As a result, the intermediate portion A12 can be displaced along the thickness direction of the seat plate A when receiving the load of the seated person.

  The seat plate A includes a peripheral edge A11 supported by the chair main body, an inner area A121 provided inside the peripheral edge A11 and displaceable with respect to the chair main body when weight is applied, and the peripheral edge A11 and the inner area. A connection region A122 provided to connect A121 and having a peripheral portion A11 and a thickness dimension smaller than that of the inner region A121 is provided. For this reason, all or the main part of the seat board A can be manufactured by integral molding by resin, and high technical force and labor like the case where a mesh material is stretched and provided on a frame are not required. In addition, when the weight is applied to the inner area A121 of the seat plate A, the inner area A121 is displaced in the plate thickness direction with respect to the peripheral edge A11 mainly due to the elastic deformation of the connection area A122. Since the load can be elastically received, the chair is comfortable to sit on.

  The inner area A121 that is cantileverly integrated with the peripheral edge A11 is elastically displaced in the thickness direction so as to sink the rear side, and the connection area A122 is changed from a U-shaped section to a J-shaped section. Bends and receives the load of the seated person. By appropriately setting the position, the cross-sectional shape, and the like of the connection region A122, it is possible to manufacture a seat plate A having various characteristics and comfortable to sit on. It is also possible to easily design the seat plate A having appropriate elasticity according to the load.

  Since the mounting body is integrally formed of resin on the seat plate body A1, the number of parts can be reduced, and the number of man-hours required for assembly can be greatly reduced compared to the case where mesh materials are stretched on the frame. Is possible. Further, since the seat plate main body A1 is integrally formed of resin, the strength is higher than that of the cushion type or mesh type, and there is little risk of tearing, cutting, or rubbing and wear. Since the mesh base is a member made of knitted or woven thin thread, if part of it frays, the fray can spread over the whole, but if the resin seat base body A1 is partly damaged, It does not spread throughout.

  Since the specific portion of the intermediate portion A12, particularly the portion that receives the buttocks and thighs of the seated person, has the structure including the inner region A121 and the connection region A122 described above, the peripheral portion A11 of the seat plate A is supported. Although it is reliably supported by the frame 3, a soft sitting comfort can be realized in the inner region A121.

  Further, since the peripheral edge portion A11 and the inner region A121 are arranged in substantially the same plane, there is no extreme protrusion in the thickness direction of the seat plate main body A1, and a flat contact feeling is obtained.

  In addition, about the seat plate A, the further deformation | transformation aspect can also be considered. In particular, the cross-sectional shape of the connection region A122 can be variously modified. As an example in which the upper surface of the peripheral edge portion A11 and the upper surface of the inner area A121 are set to be substantially flush with each other in a no-load state in which no load is applied to the seated person, such as schematically shown in FIGS. Is mentioned. Further, as an example of setting so that a step is formed between the upper surface of the peripheral edge portion A11 and the upper surface of the inner region A121 in the no-load state, the ones schematically shown in FIGS.

  The connection area A122 shown in FIG. 12 connects the edges A114 and A123 facing each other of the peripheral edge A11 and the inner area A121, and the upper surface of the peripheral edge A11 and the upper surface of the inner area A121 in a no-load state. Are set to be almost flush with each other. Then, the upper surface of the connection region A122 has a shape protruding above the upper surface in the vicinity of the end portion A114 of the peripheral edge portion A11 and the upper surface in the vicinity of the end portion A123 of the inner region A121. Specifically, the connection region A122 has an inverted U-shaped cross section. If it is such, when mounting a cushion on the upper surface of seat board main body A1, the part which the said connection area | region A122 protrudes functions also as a positioning member.

  A connection area A122 shown in FIG. 13 connects the opposite end portions A114 and A123 of the peripheral edge portion A11 and the inner area A121, and the upper surface of the peripheral edge portion A11 and the upper surface of the inner area A121 in a no-load state. Are set to be almost flush with each other. The upper surface of the connection region A122 protrudes above the upper surface in the vicinity of the end portion A114 of the peripheral portion A11 and the upper surface in the vicinity of the end portion A123 of the inner region A121, and in the vicinity of the end portion A114 of the peripheral portion A11. And a shape protruding downward from the lower surface in the vicinity of the end A123 of the inner region A121. Specifically, the connection region A122 has an S-shaped cross section. If it is such, when mounting a cushion on the upper surface of seat board main body A1, the part which the said connection area | region A122 protrudes functions also as a positioning member.

  The connection area A122 shown in FIG. 14 connects the opposite end portions A114 and A123 of the peripheral edge portion A11 and the inner area A121, and the upper surface of the peripheral edge portion A11 and the upper surface of the inner area A121 in a no-load state. Are set to be almost flush with each other. And the said connection area | region A122 has comprised the shape settled in the thickness in the edge part A114 and A123 vicinity of the said peripheral part A11 and the said inner side area | region A121. Specifically, the connection region A122 has a cross-sectional curve shape.

  A connection region A122 shown in FIG. 15 connects the opposite end portions A114 and A123 of the peripheral edge portion A11 and the inner region A121, and the upper surface of the peripheral edge portion A11 and the upper surface of the inner region A121 in a no-load state. A step is formed between the two. The lower surface of the connection area A122 has a shape protruding below the lower surface near the end A114 of the peripheral edge A11 and the lower surface near the end A123 of the inner area A121. Specifically, the connection region A122 has a J-shaped cross section.

  The connection area A122 shown in FIG. 16 connects the opposite end portions A114 and A123 of the peripheral edge portion A11 and the inner area A121, and the upper surface of the peripheral edge portion A11 and the upper surface of the inner area A121 in a no-load state. A step is formed between the two. Then, the upper surface of the connection region A122 has a shape protruding above the upper surface in the vicinity of the end portion A114 of the peripheral edge portion A11 and the upper surface in the vicinity of the end portion A123 of the inner region A121. Specifically, the connection region A122 has an inverted J-shaped cross section. If it is such, when mounting a cushion on the upper surface of seat board main body A1, the part which the said connection area | region A122 protrudes functions also as a positioning member.

  A connection region A122 shown in FIG. 17 connects the opposite end portions A114 and A123 of the peripheral edge portion A11 and the inner region A121, and the upper surface of the peripheral edge portion A11 and the lower surface of the inner region A121 in a no-load state. A step is formed between the two. The upper surface of the connection region A122 protrudes above the upper surface in the vicinity of the end portion A114 of the peripheral portion A11 and the upper surface in the vicinity of the end portion A123 of the inner region A121, and in the vicinity of the end portion A114 of the peripheral portion A11. And a shape protruding downward from the lower surface in the vicinity of the end A123 of the inner region A121. Specifically, the connection region A122 has an S-shaped cross section. If it is such, when mounting a cushion on the upper surface of seat board main body A1, the part which the said connection area | region A122 protrudes functions also as a positioning member.

  The connection region A122 shown in FIG. 18 connects the opposite end portions A114 and A123 of the peripheral portion A11 and the inner region A121, and the upper surface of the peripheral portion A11 and the inner region A121 in a no-load state. A step is formed between the upper surface of the substrate and the upper surface. And the said connection area | region A122 has comprised the shape settled in the thickness in the edge part A114 and A123 vicinity of the said peripheral part A11 and the said inner side area | region A121. Specifically, the connection region A122 has a cross-sectional curve shape.

  Further, the connection region A122 may be formed by providing a deformation-promoting hole in a bent portion (a corner portion having a substantially U-shape when viewed from the front) or the like. That is, the connection region A122 having a bent portion may have a characteristic that the bent portion does not easily deform. In that case, it is desirable to provide a hole for promoting deformation in a portion that is difficult to deform. The hole may be one or plural. The hole may be circular or slit-shaped. In the case where a plurality of slit-like holes are provided, it can be considered that they are arranged side by side in a partial arc shape or a partial radial shape.

  Up to this point, the case where the connection region A122 is the same at each cross-sectional position has been described. However, the cross-sectional shape may be different from other parts. In this way, the deformation characteristics of the connection region A122 can be further diversified. As a specific example when providing different parts, there are conceivable ones that are gradually different from one another, ones that are gradually different from one another, one part that is different from another part, and the like.

  In the connection region A122 having a shape that surrounds the inner region A121 in a substantially U shape that opens forward in plan view, for example, in order to achieve a good sitting comfort, for example, more than the U-shaped opening portion. It is preferable to set the protruding amount of the U-shaped intermediate portion to be relatively large. In this case, the protrusion amount may be set to be gradually different, gradually changed stepwise, or only the rear end portion of the seat plate A may be different from other portions.

  The shape of the connection area A122 in plan view is not limited to the U-shape, and may be a square shape, a straight line or a curved line arranged at a certain place, and the like.

  The seat plate A may be one in which the upper surface of the seat plate main body A1 is covered with a stretch fabric, or further, a cushion interposed between the stretch fabric and the seat plate main body A1.

  A seat plate B shown in FIGS. 19 to 21 is integrally formed of a resin and includes a seat plate body B1 having a first groove B121 and a second groove B122 for promoting elastic deformation on the lower surface (back surface), and a seat. A mounting body (not shown) protruding from the lower surface of the plate body 1, and a tension member B2 provided on the lower surface of the seat plate body B1 so as to cover the first groove B121 and the second groove B122. It is equipped with. The seat plate main body B1 and the mounting body are integrally formed of resin in the same manner as the seat plate 1.

  The seat plate main body B1 has a peripheral portion (in other words, a peripheral region) B11 and an intermediate portion B12 located inside the peripheral portion B11.

  The peripheral portion B11 includes a side portion (in other words, a side edge portion) B111 located on the left and right sides of the intermediate portion B12, a front portion (in other words, a front edge portion) B112 located on the front side of the intermediate portion B12, and And a rear portion (in other words, a rear edge portion) B113 located on the rear side of the intermediate portion B12. The support frame 3 of the chair body supports the front part B112 and the rear part B113.

  The first groove B121 is formed in a part adjacent to the side part B111 in the intermediate part B12, that is, a part forming a boundary with the side part B111. In addition, the second groove B122 is formed in an intermediate part in the front-rear direction of the intermediate part B12, that is, a part that divides the intermediate part B12 in the front-rear direction.

  Said 1st groove | channel B121 is a bottomed groove | channel which makes a substantially "<" shape in planar view and leaves | separates from side part B111 as it goes to the front-back direction center. The width dimension gradually increases toward the center in the front-rear direction.

  Said 2nd groove | channel B122 is a bottomed groove | channel which makes | forms the planar view partial circular arc shape which the center part bulged back. The width dimension is constant over the entire length direction.

  Both the first groove B121 and the second groove B122 are opened downward, and the portion of the seat plate body B12 is thinned. On the other hand, despite the presence of these grooves B121 and B122, the upper surface (surface) of the seat plate main body B12 is smooth and there is no clear uneven step.

  At the boundary between the peripheral edge portion B11 and the intermediate portion B12 on the lower surface of the seat plate main body B1, a tension member mounting projection as a mounting portion for mounting the tension material B2 so as to cover the first groove B121 and the second groove B122 B123 is formed. The upholstery attachment protrusion B123 is substantially cylindrical and has a shape in which the diameter gradually increases toward the protruding end (lower end). A plurality of the tension material attaching projections B123 are provided on the four sides of the boundary between the peripheral edge portion B11 and the intermediate portion B12 so as to be separated from each other at a predetermined interval. The tension member mounting projections B123 located at the four corners have a larger diameter than the other tension material mounting projections B123.

  The upholstery material B2 is a member made of, for example, a synthetic resin or a cloth having a substantially rectangular shape, and is formed of a material that is flexible in the thickness direction and difficult to extend in the surface direction. An attachment hole B21 that can be engaged with an attachment portion for attaching to the seat plate body B1, specifically, an attachment material projection B123 of the seat plate body B1, is provided on the periphery of the upholstery material B2. The diameter of the mounting hole B21 is smaller than the diameter of the projecting end of the corresponding tension material mounting projection B123, and is equal to or slightly larger than the diameter of the base end of the tension material mounting projection B123.

  The upholstery material B2 is elastically engaged with the upholstery material attachment projections B123 of the seat plate main body B1 so that the attachment holes B21 are elastically engaged with each other (between the edges of the seat plate main body B1 where the grooves B121 and B122 are not provided). Between the part B112 and the rear part B113 or between the left and right side parts B111) and attached to the seat plate body B1.

  The upholstery material B2 backs up the intermediate portion B12 including the grooves B121 and B122 of the seat plate main body B1 from the lower surface side. The tension of the upholstery material B2 increases with the elastic deformation of the seat plate main body B1, so that the tension is increased between the side parts B111. And a seated person's load is shared and received by seat board main body B1 and upholstery material B2.

A mounting body takes the structure similar to the mounting bodies 12 and 13 of the seat board 1 in the said embodiment. A front attachment body (not shown) is provided on the lower surface of the front portion B112 of the peripheral edge B11, and a rear attachment body (not shown) is provided on the lower surface of the rear portion B113 of the peripheral edge B11. Attachment of the seat board B1 to the chair body can also be performed in the same manner as in the above embodiment. That is, the attachment bodies provided on the lower surface of the front portion B112 and the lower surface of the rear portion B113 are supported by the front support portion 33 and the rear support portion 34 of the support frame 3, respectively. At this time, the peripheral portion B11 including the front portion B112 and the rear portion B113 supported by the support frame 3 is a rigid region. Further, grooves (or bottomed holes) B121 and B122 thinner than the peripheral edge B11 are provided at portions other than the peripheral edge B11, and the grooves B121 and B122 are deformed more easily than the peripheral edge B11. It becomes an area. As a result, the intermediate portion B12 can be displaced along the thickness direction of the seat plate B when subjected to the load of the seated person. The seat plate B is used to promote elastic deformation of the seat plate body B1. Since the grooves B121 and B122 are provided, the seat plate main body B1 mainly receives the load of the seated person while being bent in the thickness direction, and the seat plate main body B1 is backed up by the tension material B2. As a result, moderate elasticity can be obtained as the entire seat plate B, and the seat plate main body B1 bends and deforms according to the load of the seated person and becomes comfortable, while the entire seat plate or back plate. The strength as can be ensured. Therefore, it is possible to realize a comfortable chair without requiring high technical force and labor for manufacturing as compared with a conventional frame member provided with a mesh for receiving a full load.

  In addition, since the first groove B121 is provided in a portion that forms a boundary with the side portion B111 of the intermediate portion B12, the seat plate body B1 is easily elastically deformed by receiving a load from a seated person.

  Further, since the seat plate main body B1 includes the second groove that divides the intermediate portion B12 forward and backward, the center portion of the seat plate main body B1 is particularly easily deformed, and therefore, further improvement of the seating comfort is achieved. Can do.

  In addition, since the width dimension of the first groove B121 varies depending on the part, that is, the width dimension gradually increases toward the center in the longitudinal direction, the longitudinal center part of the seat plate body B1 is further elastically deformed from this point. It is easy to improve the sitting comfort.

  The seat plate B receives and receives the load from the seated person by the seat plate main body B1 that elastically deforms and the tension member B2 whose tension is changed in accordance with the elastic deformation of the seat plate main body B1. Since it is doing so, the further improvement of the sitting comfort of such a chair and the ensuring of the intensity | strength as the whole seat board B can be aimed at.

  In addition, the tension member mounting projection B123, which gradually increases in diameter toward the projecting end, is smaller than the diameter of the projecting end of the tension material mounting projection B123 and is equal to or slightly larger than the diameter of the base end. Since the upholstery material B2 is used as the seat plate main body B1 by elastically engaging the mounting holes B21, the upholstery material B2 can be easily attached to the seat plate main body B1.

  The width dimension of the groove B121 may be changed stepwise instead of gradually. Alternatively, the width dimension of the groove B121 may be constant over the entire length direction, and the vertical depth may be increased gradually or stepwise toward the center in the length direction.

  In addition, about the seat board B, the further deformation | transformation aspect can also be considered. In particular, the bottom view shape of the groove can be variously modified.

  In the structure shown in FIG. 22, a plurality of vertical grooves B124 and a plurality of horizontal grooves B125 for promoting elastic deformation are formed on the lower surface of the seat plate main body B1, and on the lower surface of the seat plate main body B1. The upholstery material B2 is provided so as to cover the vertical groove B124 and the horizontal groove B125. The vertical grooves B124 and the horizontal grooves B125 are arranged in parallel at a predetermined interval, and the vertical grooves B124 and the horizontal grooves B125 form a lattice shape.

  The vertical groove B124 and the horizontal groove B125 are also opened downward to make the portion of the seat plate body B12 thinner. On the other hand, despite the presence of these grooves B124 and B125, the upper surface of the seat plate body B12 is smooth and there is no clear uneven step.

  By providing the vertical grooves B124 and the horizontal grooves B125 in a lattice pattern over the entire region of the intermediate portion B12 of the seat plate main body B1, the seat plate main body B1 can be bent in the thickness direction as a whole when seated. Thereby, the improvement of the sitting comfort can be aimed at further.

  The structure for providing the tension member B2 to the seat plate body B1 is not limited to the engagement between the protrusion B123 and the attachment hole B21 described above. For example, as shown in FIG. 23, the tension material fixing members B3 and B4 for supporting and holding the tension material B2 from below so as not to drop off are used, and the tension material fixing members B3 and B4 are provided by punching. The through holes B31 and B41 may be engaged with the tension member attaching projection B123. Furthermore, the tension member fixing members B3 and B4 may be fixed to the seat plate main body B1 with a fastening tool such as a screw.

  A bead is formed on the peripheral edge of the upholstery material B12, and the upholstery material B12 is sandwiched between the seat plate main body B1 and the support frame 3 that supports the seat plate main body B1, and the upholstery material B12 is placed on the seat plate main body B1. It may be stretched on the lower surface of the.

  Alternatively, a locking member may be provided on the periphery of the upholstery material B12, and the locking member may be engaged with a locking portion such as a locking groove provided on the seat plate B.

  Further, a functional sheet such as urethane may be interposed between the seat plate body B1 and the upholstery material in order to add elasticity and heat retention.

  The seat plate C shown in FIGS. 24 to 28 is a resin-integrated member including a seat plate main body C1 and an attachment body (not shown) protruding from the lower surface of the seat plate main body C1.

  The seat plate main body C1 has a peripheral portion (in other words, a peripheral region) C11 and an intermediate portion C12 located inside the peripheral portion C11.

  The peripheral portion C11 includes a side portion (in other words, a side edge portion) C111 located on the left and right sides of the intermediate portion C12, and a front portion (in other words, a front edge portion) C112 located on the front side of the intermediate portion C12. And a rear portion (in other words, a rear edge portion) C113 located on the rear side of the intermediate portion C12. The support frame 3 of the chair body supports the front part C112 and the rear part C113.

  And the beam C121 and the connection member C122 are provided in the specific location of the intermediate part C12, the whole area of the intermediate part C12 in the example of illustration. The intermediate portion C12 has a structure in which a plurality of beams C121 that can be bent in the thickness direction of the seat plate body C1 are arranged adjacent to each other in parallel, and the beams C121 are intermittently connected to each other by a connecting member C122.

  Each beam C121 has a groove opened on the lower surface (back surface) side, and has a cross-sectional shape that can be deformed in a direction in which the groove expands when a load is applied to the seat plate body C1 in the thickness direction. There is no. Here, the expanding direction indicates a direction in which the width dimension on the opening end (ie, lower end) side of each beam C121 is larger than the width dimension on the opposite side (ie, upper end) side of the opening end.

  Thus, when the beam C121 bends downward, side walls C1212 (described later) of the adjacent beams C121 are connected by the connecting member C122, and the separation distance between the adjacent beams C121 (the gap between the beams C121). Since the size is difficult to change, the individual beams C121 are elastically deformed so that the grooves are expanded (side walls C1211 on both sides of one beam C121 are separated from each other). Therefore, when the load applied to the beam C121 is lost, the seat plate main body C1 is returned to the original flat state by using the elastic return force when the plurality of beams C121 return to the original form. Become.

  Each of the beams C121 is constructed between the front part C112 and the rear part C113 of the peripheral part C11, and is continuously formed over the entire length without breaking the groove. In the illustrated example, all the beams C121 have the same shape and size. Specifically, each of the beams C121 includes a top wall C1211 and a lateral cross-section co-integrated with a pair of side walls C1212 extending from both side edges of the top wall C1211 to the lower surface side of the seat plate body C1. Form a letter shape. And the outer surface of the side wall C1212 of the adjacent beam C121 is intermittently connected by the said connection member C122 with a fixed pitch.

  In the illustrated example, the connecting member C122 has a groove that is open on the lower surface side, and a pair of side walls that form a top wall C1221 and a pair extending from both side edges of the top wall C1221 to the lower surface side of the seat plate body C1. It has a U-shaped transverse cross section integrally provided with C1222, and is formed integrally with the beam C121 and resin. The upper surface (front surface) of the top wall C1211 of the connecting member C122, the upper surface of the top wall C1211 of the beam C121, and the upper surface of the peripheral edge C11 are flush with each other and form a seating surface.

  A mounting body takes the structure similar to the mounting bodies 12 and 13 of the seat board 1 in the said embodiment. A front attachment body (not shown) is provided on the lower surface of the front portion C112 of the peripheral edge portion C11, and a rear attachment body (not shown) is provided on the lower surface of the rear portion C113 of the peripheral edge portion C11. Attachment of the seat plate C1 to the chair body can also be performed in the same manner as in the above embodiment. That is, the attachment bodies provided on the lower surface of the front portion C112 and the lower surface of the rear portion C113 are supported by the front support portion 33 and the rear support portion 34 of the support frame 3, respectively. At this time, the peripheral portion C11 including the front portion C112 and the rear portion C113 supported by the support frame 3 is a rigid region. Further, a beam C121 having a groove that opens downward is provided in a portion other than the peripheral edge C11, and further, a slit (gap) that communicates vertically between the beams C121 is provided, and the beam C121 is more than the peripheral edge C11. It becomes a deformation region where elastic deformation is easy. As a result, the intermediate portion C12 can be displaced along the thickness direction of the seat plate C when receiving the load of the seated person.

The seat plate C is provided with a seat plate body C1 having a structure in which a plurality of beams C121 that can be bent in the thickness direction are arranged adjacent to each other and the adjacent beams C121 are intermittently connected by a connecting member C122. It is. Therefore, all or the main part of the seat plate C can be manufactured by integral molding with a resin, and high technical force and labor as in the case of providing a mesh on a frame member are not required. In addition, since the plurality of beams C121 are installed between the front part C112 and the rear part C113 of the peripheral edge part C11, and the beams C121 are intermittently connected by the connecting member C122, the strength enough to withstand the load is obtained. It can be secured sufficiently. In addition, each of the beams C121 has a groove opened on the lower surface side, and has a cross-sectional shape that can be deformed in a direction in which the groove expands when a load is applied to the seat plate body C1 in the thickness direction. Therefore, appropriate flexibility can be ensured, and the chair 1 is comfortable to sit on. In other words, the specific portion having the beam C121 and the connecting member C122 has sufficient strength to withstand the load, and also has flexibility because the beam C121 is deformed in a direction in which the groove expands when a load is applied. It will be. In addition, since the beam C121 and the connecting member C122 each have a shape having a groove, it is possible to reduce the weight without reducing the strength.
It should be noted that the strength and flexibility are set such that the height of the side wall C1212 of the beam C121, the arrangement pitch of the connection members C122, and the like are set to required values as appropriate. Plate C can be made. Therefore, it is possible to easily design the seat plate C having appropriate elasticity according to the load.

  In particular, since the seat plate body C1 having the peripheral portion C11 and the intermediate portion C12 and the mounting body are integrally formed of resin, the number of parts can be reduced, and a mesh is provided on the frame material. Compared to the above, the number of man-hours required for assembly can be greatly reduced. Further, since the seat plate main body C1 is integrally formed of resin, the strength is higher than that of a cushion type or a mesh type, and there is little risk of tearing, cutting, rubbing and wear. Since the mesh base is a member made of knitted or woven thin thread, if part of it frays, the fray can spread over the whole, but if the resin seat base body C1 is partly broken, It does not spread throughout.

  Since the specific part of the intermediate part C12, the part that receives the seated person's buttocks and thighs have the structure including the beam C121 and the connecting member C122, the peripheral part C11 of the seat plate C is the support frame 3. Although firmly supported, the inner region can provide a soft sitting comfort.

  Further, since the upper surfaces of the beam C121, the connection region C122, and the peripheral edge portion C11 are flush with each other, the seat plate main body C1 has no extreme protrusion in the thickness direction, and a flat sitting comfort is obtained.

  In addition, about the seat board C, the further deformation | transformation aspect can also be considered. In particular, the deformation characteristics of the beam C121 in a partial area of the intermediate portion C12 may be different from the deformation characteristics of the beam C121 in another area. Specifically, as shown in FIGS. 29 and 30, the flexibility of the two regions that form a left-right pair that receives the collar portion of the intermediate portion C12 can be made higher than the flexibility of the other regions. That is, the thickness direction dimension L2 of the beam C121 located in the region where the flexibility is desired to be further increased (the dimension from the upper surface of the seat plate main body C1 to the lower end of the side wall C1212) L1, and the thickness direction dimension L2 of the beam C121 located in the other region. Is set smaller. That is, a highly flexible portion is formed by partially reducing the rigidity of the beam C121. Thereby, the part which receives a seated person's buttocks according to how much weight is applied becomes the easiest to deform | transform. Therefore, it becomes possible to support the whole buttocks equally, and to improve sitting comfort further.

  In the illustrated example, the beam C121 and the connection member C122 are disposed over the entire area of the intermediate portion C12. However, a specific portion where the beam C121 and the connection member C122 are disposed in a part of the intermediate portion C12 may be provided. Good. In this case, a plurality of specific locations may be set.

  Furthermore, the case where the beam C121 and the connecting member C122 are arranged over the entire intermediate portion C12, and the deformation characteristics of the beam C121 in a partial region of the intermediate portion C12 are made different from the deformation characteristics of the beam C121 in other regions will be described. However, when a plurality of specific places are set as described above, the deformation characteristics may be changed between one specific place and another specific place. As an example, it can be considered that the arrangement direction of the beam at one specific place is different from the arrangement direction of the beam at another specific place. As another example, it is also conceivable to make the shape and size of the beam and the connection member at one specific location different from the shape and size of the beam and the connection member at another specific location.

  Of course, the shape of the beam is not limited to that described above, and various modifications can be made without departing from the spirit of the beam. The beam C121 in the illustrated example is linear in a line of sight from a direction orthogonal to the seating surface, but may be curved in a curved line. Among the curved ones, for example, not only those having a fan-like shape or a wave-like shape and erected between the peripheral portions, but also annular ones are included. Examples of the annular shape include an annular shape or an elliptical shape having different sizes. In such a case, the beams may be arranged concentrically and the locations may be intermittently connected as appropriate by the connecting member. The cross-sectional shape of the beam is not limited to the illustrated example. For example, the beam includes a top wall and a pair of side walls that extend from both side edges of the top wall to the lower surface side of the seat plate body at a certain angle. And a cross-sectional trapezoidal shape, a wall having a C-shaped cross-section opening downward, a wall having a V-shaped cross-section opening downward, and the like.

  Further, the connecting member is not limited to the above-described embodiment, and may be, for example, one having no groove.

  Of course, the upper surface of the beam, the connecting member, and the peripheral portion is not limited to the one that is flush with the surface. For example, various modifications such as retracting the connecting member to the back side of the surface of the beam are possible.

  The seat plate C may be one in which the upper surface of the seat plate main body C1 is covered with a tension fabric, or a cushion interposed between the tension fabric and the seat plate main body C1.

  A seat plate D shown in FIGS. 31 to 33 is a resin molded member including a seat plate body D1 and a support portion D4 that functions as an elastically deformable spring.

  The seat plate main body D1 has a peripheral portion (in other words, a peripheral region) D11 and an intermediate portion D12 located inside the peripheral portion D11.

  The peripheral portion D11 includes side portions (in other words, side edge portions) D111 located on the left and right sides of the intermediate portion D12, and a front portion (in other words, front edge portions) D112 located on the front side of the intermediate portion D12. And a rear portion (in other words, a rear edge portion) D113 located on the rear side of the intermediate portion D12. The support frame 3 of the chair body supports the front part D112 and the rear part D113.

  The support portion D4 is provided at two positions on the left and right sides of the rear portion D113 of the peripheral edge portion D11, and has a substantially U shape that opens to the front surface side and protrudes to the back surface side. The protruding portion D41 is formed on the rear frame of the chair body. 4 is related.

  A mounting body D2 on the front side of the seat plate D is integrally formed on the lower surface of the front portion A112 of the peripheral edge portion A11. The front attachment body D2 is attached to the front support portion 33 of the support frame 3 so as to be rotatable within a slight operating range.

  The mounting body D3 on the rear side of the seat plate D is a separate member from the seat plate main body D1 and the support portion D4. The rear attachment body D3 is provided with a fixing portion D31 for holding the support portion D4, and the rear attachment body D3 is assembled to the support portion D4 via the fixing portion D31. However, the rear attachment body D3 may be integrally formed with the support portion D4. The rear attachment body 33 is attached to the rear support portion 34 of the support frame 3 so as not to be detached. The rear attachment body D3 forms a bearing that passes through the rear frame 4 together with the rear support portion 34 of the support frame 3, like the rear attachment body 13 of the seat plate 1 in the above embodiment.

  A gap is interposed between the lower surface of the intermediate part D12 of the seat plate D and the upper edge of the intermediate part of the support frame 3, and displacement and / or elastic deformation along the thickness direction of the intermediate part D12 is caused by this gap. Is acceptable.

  In the chair shown in FIGS. 31 to 33, the rear part D113 of the seat plate D and the part on which the seated person's buttocks are placed are connected by a support part D4 which is an elastically deformable resin spring. Yes. When the seat plate D receives the load of the seated person, the support portion D4 (projecting portion D41) having a substantially U-shaped shape is elastically deformed so that the seat plate D is appropriately bent, and the intermediate portion D12 of the seat plate D is the thickness of the seat plate D. Displaces along the direction.

  Further, since the rear mounting portion D3 includes a fixing portion D31 that holds the central portion in the extending direction (left-right direction) of the protruding portion D41, the support portion D4 is attached to the rear mounting portion before and after elastic deformation. Positioned reliably with respect to D3.

  In addition, about the seat board D, the further deformation | transformation aspect can also be considered. Of course, the specific shape of the support portion D4 serving as the resin spring is not limited to a substantially U shape, and various shapes such as a wave shape in the thickness direction and a shape protruding in a C shape can be used. Deformation is possible.

  The seat plate D may be one in which the upper surface of the seat plate main body D1 is covered with a tension fabric, or a cushion interposed between the tension fabric and the seat plate main body D1.

  The seat plate E shown in FIGS. 34 and 35 is a resin-integrated member provided with a seat plate main body E1 and an attachment body (not shown) protruding from the lower surface of the seat plate main body E1.

  The seat plate main body E1 has a peripheral portion (in other words, a peripheral region) E11 and an intermediate portion E12 located inside the peripheral portion E11.

  The peripheral edge portion E11 includes side portions (in other words, side edge portions) E111 located on both left and right sides of the intermediate portion E12, and a front portion (in other words, front edge portions) E112 located on the front side of the intermediate portion E12. And a rear portion (in other words, a rear edge portion) E113 located on the rear side of the intermediate portion E12. The support frame 3 of the chair body supports the front part E112 and the rear part E113.

  And the said strip | belt-shaped member E121 and the connection piece E122 are provided in the specific location of the intermediate part E12, the whole region of the intermediate part E12 in the example of illustration. The intermediate portion E12 is provided with a plurality of strip-shaped members E121 that can be bent in the thickness direction adjacent to each other, and the adjacent strip-shaped members E121 are linearly connected to each other by a connecting piece E122 that is narrower than the strip-shaped member E121. Each has a structure in which it is connected to be elastically deformable through a longer path than the connection.

  Each of the belt-like members E121 is disposed so as to connect two portions of the peripheral edge E11 that are opposed to each other, and the two portions of the peripheral edge E11 can be connected in an elastically deformable manner through a path longer than a straight line. It has a distorted shape. In the example of illustration, each strip | belt-shaped member E121 has connected the left-right side part E111 of the peripheral part E11 in the same front-back position.

  Each of the belt-like members E121 has a different surplus length with respect to the straight path, and the surplus length of the specific belt-like member E121 is set to be different from the surplus length of the other belt-like members E121. . More specifically, the surplus length of the belt-like member E121 near the center of the intermediate portion E12 is made longer than the surplus length of the front and rear belt-like members E121 of the intermediate portion E12. In other words, the surplus length of the band-shaped member E121 of the part that receives the buttocks of the seated person is set to be the longest, and the band-shaped member E121 gradually moves from the band-shaped member E121 toward the front part E112 and the rear part E113 of the peripheral part E11. The excess length is set to be short.

  Each connection piece E122 is disposed so as to connect two portions of the adjacent belt-like member E121, and can be connected to be elastically deformable with a longer path than connecting the two portions of the belt-like member E121 with a straight line. The shape is distorted in plan view. In the illustrated example, each connection piece E122 connects the front edge of one belt-like member E121 and the rear edge of another belt-like member E121 disposed adjacent to the front of the one belt-like member E121 at the same left and right positions. doing.

  Each of the connection pieces E122 is different from each other in the surplus length with respect to the straight path, and the surplus length of the specific connection piece E122 is set to be different from the surplus lengths of the other connection pieces E122. . More specifically, the surplus length of the connection piece E122 near the center of the intermediate portion E12 is set to be longer than the surplus length of the connection pieces E122 on both the left and right sides of the intermediate portion E12. In other words, the surplus length of the connection piece E122 of the portion that receives the buttocks of the seated person is set to be the longest, and the surplus of the band-like member E121 gradually increases from the connection piece E122 toward the left and right side parts E111 of the peripheral edge E11. The length is set to be short. And these strip | belt-shaped member E121 and the connection piece E122 are arrange | positioned in substantially the same surface, and each strip | belt-shaped member E121 and each connection piece E122 have comprised the waveform.

  A mounting body takes the structure similar to the mounting bodies 12 and 13 of the seat board 1 in the said embodiment. A front attachment body (not shown) is provided on the lower surface of the front portion E112 of the peripheral edge portion E11, and a rear attachment body (not shown) is provided on the lower surface of the rear portion E113 of the peripheral edge portion E11. Attachment of the seat plate E1 to the chair body can also be performed in the same manner as in the above embodiment. That is, the attachment bodies provided on the lower surface of the front portion E112 and the lower surface of the rear portion E113 are supported by the front support portion 33 and the rear support portion 34 of the support frame 3, respectively. At this time, the peripheral portion E11 including the front portion E112 and the rear portion E113 supported by the support frame 3 is a rigid region. Further, elastically deformable belt-like members E121 and connection pieces E122, and further slits (through holes) communicating vertically between the belt-like members E121 and between the connection pieces E122 are provided in parts other than the peripheral edge E11. The belt-like member E112 and the connection piece E122 become a deformation region that is more easily elastically deformed than the peripheral edge E11. As a result, the intermediate portion E12 can be displaced along the thickness direction of the seat plate E when receiving the load of the seated person.

  In the seat plate E, a plurality of strip-shaped members E121 that can be bent in the thickness direction are arranged adjacent to each other, and the adjacent strip-shaped members E121 are connected in a straight line by a connecting piece E122 that is narrower than the strip-shaped member E121. And a seat plate body E1 having a structure in which each is connected to be elastically deformable through a long path. Therefore, all or the main part of the seat plate E can be manufactured by integral molding with a resin, and high technical force and labor as in the case where a mesh is stretched on a frame member are not required. In addition, since the connection piece E122 is connected to be elastically deformable through a longer path than connecting with a straight line, the connection piece E122 forms not only expansion / contraction of the material of the connection piece E122 itself but also the deformation part. Since the belt-like member E121 to which the connecting piece E122 is connected is easily deformed and the seat plate body E1 can elastically receive the load of the seated person, the chair 1 is comfortable to sit on. In particular, if the extra lengths of the belt-like member E121 and the connecting piece E122 are set according to the load distribution, the portion that receives the load directly can be easily bent while maintaining the strength of the entire seat plate.

  Each of the belt-like members E121 mainly receives the load of the seated person while being bent in the thickness direction, and each connection piece E122 having a width smaller than that of each of the belt-like members E121 assists the load of the seated person while being bent in the thickness direction. Since the movement of each of the belt-like members E121 is controlled while receiving, various characteristics can be obtained by appropriately setting the number of the belt-like members E121 and the surplus length, or the location where the connecting piece E122 is formed and the surplus length. It is possible to make a comfortable seat plate having the seat. Therefore, it is possible to easily design the seat plate E having appropriate elasticity according to the load.

  Since the seat plate body E1 having the peripheral edge portion E11 and the intermediate portion E12 and the mounting body are integrally formed of resin, the number of parts can be reduced, and when the mesh is stretched on the frame material In comparison, the number of man-hours required for assembly can be greatly reduced. Further, since the seat plate body E1 is integrally formed of resin, the strength is higher than that of a cushion type or mesh type, and there is little risk of tearing, cutting, or rubbing and wear. Since the mesh base is a member made of knitted or woven thin thread, if part of it frays, the fray can spread over the whole, but even if part of the resin seat base body E1 is damaged, It does not spread throughout.

  Since the specific part of the intermediate part E12, the part that receives the seated person's buttocks and thighs have a structure including the belt-like member E121 and the connecting piece E122, the peripheral region of the seat plate E is firmly supported by the frame. However, the inner region can provide a soft sitting comfort.

  Moreover, since the said intermediate part E12 is provided with the strip | belt-shaped member E121 and the connection piece E122 which make a wave shape, these bend in the thickness direction and it is comfortable to sit. Further, since the belt-like member E121 and the connecting piece E122 are arranged in substantially the same plane, the intermediate portion E12 does not have an extreme protrusion in the thickness direction, and a flat sitting comfort is obtained.

  Furthermore, each belt-like member E121 is disposed so as to connect the two peripheral edges E11, in other words, the left and right side parts E111, and the two peripheral edges E11 are connected by a straight line. In addition, since it has a shape that can be connected to be elastically deformable through a long path, not only expansion and contraction of the material of the belt-like member E121 but also an allowable range in which the belt-like member E121 is deformed in the bending direction is increased, and the seat plate E is flexible. It will be rich in nature. And since each said strip | belt-shaped member E121 has connected the right-and-left side part E111, it can receive a load firmly by each strip | belt-shaped member E121.

  Since each of the belt-like members E121 and each of the connection pieces E122 have different surplus lengths with respect to the straight line, the flexibility of the seat plate E can be appropriately changed in each part. Specifically, since the portion that receives the buttocks of the seated person is set longer than the surplus length of the other strip-shaped member E121 and the connection piece E122, the portion that receives the buttocks of the seated person is larger than the other parts. Can be bent. Therefore, the amount of deformation can be varied depending on the part, and a comfortable sitting comfort can be provided.

  In addition, about the seat board E, the further deformation | transformation aspect can also be considered. For example, each belt-like member E121 in the seat plate E shown in FIG. 36 has an annular shape, and a plurality of belt-like members E121 are arranged concentrically. Each belt-like member E121 has a tear shape in which the rear portion has a semicircular arc shape and the width gradually decreases toward the front.

  Each connection piece E122 is disposed so as to connect two portions of the adjacent belt-like member E121, and is connected to be elastically deformable with a longer path than connecting the two portions of the belt-like member E121 with a straight line. The shape to get. Specifically, each connecting piece E122 has a wave shape, and an inner edge of one belt-like member E121 and an outer edge of another belt-like member E121 disposed adjacent to the inside of the one belt-like member E121. The connection is made at a position that is connected by a route longer than the shortest distance. Such connecting pieces E122 are arranged so as to fill the space between the adjacent belt-like members E121 with a substantially constant gap.

  In addition to the above, in the middle portion E12 of the seat plate E shown in FIG. 36, apart from the belt-like member E121 and the connecting piece E122, the innermost portion of the belt-like member E121 at the right specific location and The auxiliary member E123 having a substantially linear shape capable of elastically deforming the innermost portion of the belt-like member E121 at the left specific portion is provided. And these strip | belt-shaped member E121, the connection piece E122, and the auxiliary member E123 are arrange | positioned in the substantially same surface.

  According to the seat plate E having the structure shown in FIG. 36, in the front-rear and left-right directions of the seat plate E, it is possible to obtain a bending characteristic corresponding to the weight distribution from the seated person's buttocks to the thigh. In particular, since the two parts of the intermediate part E12 have the configuration as described above, the part that receives the buttocks of the seated person is most easily deformed according to the weight. Therefore, it becomes possible to support the whole buttocks equally, and to improve sitting comfort further. In addition, in the intermediate portion E12 of the seat plate E shown in FIG. 35, there is a possibility that the seated person may feel uncomfortable because there is a relatively large gap. However, like the seat plate shown in FIG. If the belt-like member E121, the connecting piece E122, and the auxiliary member E123 are arranged densely so as to fill the gap, there is no possibility of giving a sense of incongruity.

  The belt-like member E121 and the connection piece E122 are not limited to those arranged on the same plane, and various modifications such as, for example, undulating the connection piece E122 in the thickness direction are possible.

  Further, the cross-sectional shape of the belt-like member E121 may be a shape in which a corner edge portion is eliminated, such as a circular shape or an elliptical shape. In this case, even if the belt-shaped member E121 is bent downward by sitting and twisted in the front-rear direction, the corner edge does not hit the seated person, and the sitting comfort is further improved. Similarly, the cross-sectional shape of the connection piece E122 can be such that the corner edge portion is eliminated.

  The surplus length of each strip member E121 may be set so as to gradually change. For example, each belt-like member E121 of the intermediate portion E12 gradually changes its length from the front side to the rear side of the seat plate E, or gradually changes its length from the center of the seat plate E toward the left and right. Things can be considered.

  The seat plate E may be one in which the upper surface of the seat plate main body E1 is covered with a tension fabric, or a cushion interposed between the tension fabric and the seat plate main body E1.

  In the example described above, the entire region of the intermediate portion E12 has the structure including the belt-like member E121 and the connection piece E122. However, the belt-like member E121 and the connection piece E122 are provided only in a partial region of the intermediate portion E12. It may be provided. As an example, it is conceivable that the belt-like member E121 and the connecting piece E122 are provided dispersed in a plurality of regions of the intermediate portion E12.

  The seat plate F shown in FIGS. 37 and 38 is a resin-integrated member including a seat plate main body F1 and an attachment body (not shown) protruding from the lower surface of the seat plate main body F1.

  The seat plate body F1 has a peripheral portion (in other words, a peripheral region) F11 and an intermediate portion F12 located inside the peripheral portion F11.

  The peripheral portion F11 includes a side portion (in other words, a side edge portion) F111 located on the left and right sides of the intermediate portion F12, a front portion (in other words, a front edge portion) F112 located on the front side of the intermediate portion F12, And a rear portion (in other words, a rear edge portion) F113 located on the rear side of the intermediate portion F12. The support frame 3 of the chair body supports the front part F112 and the rear part F113.

  And the said strip | belt-shaped member F121 is provided in the specific location of the said intermediate part F12, the whole region of the intermediate part F12 in the example of illustration. The intermediate portion F12 has a structure in which a plurality of strip-shaped members F121 having a shape protruding on both the upper and lower surfaces in the thickness direction are spread without gaps, and adjacent strip-shaped members F121 are connected to each other at a plurality of locations.

  Each of the belt-like members F121 is arranged so as to connect two portions of the peripheral edge portion F11 facing each other, and has a distorted shape that can be connected to be elastically deformable through a longer path than connecting the two portions of the peripheral edge portion F11 with a straight line. I am doing. In the example of illustration, each strip | belt-shaped member F121 has connected the left-right side part F11 of the peripheral part F11 in the same front-back position.

  Each strip-like member F121 has a wave shape that repeatedly projects in and out at a constant period in the thickness direction. Adjacent band-shaped members F121 are 180 ° out of phase with successive wavy protrusions. And the strip | belt-shaped member F121 is connected in the intermittent position F122 where the side edges of the adjacent strip-shaped member F121 approach most. Specifically, each of the band-like members F121 is closely arranged so as not to overlap with the adjacent band-like member F121 in a line of sight (in other words, a plan view) from a direction orthogonal to the seat plate main body F1. The side edges of the adjacent belt-like members F121 are integrated at the connection point F122. That is, the belt-like members F121 are connected to each other at positions in the thickness direction that are substantially flush with the peripheral edge F11.

  And in the part which is not connected, the opening F123 which connects the front side and back side of the seat-plate main body F1 between the adjacent strip | belt-shaped members F121 is formed. The opening F123 is formed intermittently based on the phase shift of the protrusion and depression of the band-shaped member F121. Each of these band-like members F121 has a linear shape in a line of sight from a direction orthogonal to the seat plate body F1, and is arranged in parallel.

  A mounting body takes the structure similar to the mounting bodies 12 and 13 of the seat board 1 in the said embodiment. A front attachment body (not shown) is provided on the lower surface of the front portion F112 of the peripheral edge portion F11, and a rear attachment body (not shown) is provided on the lower surface of the rear portion F113 of the peripheral edge portion F11. Attachment of the seat board F1 to the chair body can also be performed in the same manner as in the above embodiment. That is, the attachment bodies provided on the lower surface of the front portion F112 and the lower surface of the rear portion F113 are supported by the front support portion 33 and the rear support portion 34 of the support frame 3, respectively. At this time, the peripheral portion F11 including the front portion F112 and the rear portion F113 supported by the support frame 3 is a rigid region. The belt-like member F121 that can be elastically deformed is provided in a region other than the peripheral edge F11, and the belt-like member F112 becomes a deformation region that is more easily elastically deformed than the peripheral edge F11. As a result, the intermediate portion F12 can be displaced along the thickness direction of the seat plate F when receiving the load of the seated person.

  The seat plate F is provided with a plurality of strip-shaped members F121 that can be bent in the thickness direction adjacent to each other, and adjacent strip-shaped members F121 are intermittently connected to each other. Therefore, all or the main part of the seat plate F can be manufactured by integral molding with a resin, and high technical force and labor as in the case where a mesh is stretched on a frame member are not required.

  Each band-like member F121 mainly receives a seated person's load while being bent in the thickness direction, and connects a plurality of positions of each of the band-like members F121, so that the movement of each band-like member F121 is controlled appropriately. The belt-like member F121 can be bent. In addition, by setting the number of strip members F121, the extra length, the interval between the connection points F122, and the like as appropriate, a seat plate having various characteristics and comfortable to sit on can be made. Therefore, it is possible to easily design the seat plate F having appropriate elasticity according to the load.

  Further, since the seat plate body F1 having the peripheral portion F11 and the intermediate portion F12 and the mounting body are integrally formed of resin, the number of parts can be reduced, and a mesh is provided on the frame member. Compared to the case, the number of man-hours required for assembly can be greatly reduced. Further, since the seat plate body F1 is integrally formed of resin, it has higher strength than the cushion type or mesh type, and is less likely to be torn, cut or rubbed and worn. Since the mesh base is a member made of knitted or woven thin thread, if part of it frays, the fray can spread throughout, but if the resin seat base body F1 is partly broken, It does not spread throughout.

  Since the specific part of the intermediate part F12, the part that receives the seated person's buttocks and thighs have a structure including the belt-like member F121, the peripheral region of the seat plate F is firmly supported by the frame, The inner region can provide a soft sitting comfort.

  Moreover, since the said intermediate part F12 is provided with two or more strip | belt-shaped member F121 which makes a wave shape, these bend in the thickness direction and are comfortable to sit. Moreover, since the band-shaped member F121 is wave-shaped but connected to the adjacent band-shaped member F121 at a plurality of locations, the band-shaped member F121 does not shift laterally and has excellent shape retention.

  Furthermore, each belt-like member F121 is disposed so as to connect the two peripheral portions F11, in other words, the left and right side portions F11, and connects the two peripheral portions F11 with a straight line. In addition, since it has a shape that can be connected to be elastically deformable through a long path, not only the expansion and contraction of the material of the band-shaped member F121 but also the allowable range in which the band-shaped member F121 is deformed in the bending direction is increased, and the seat plate F is flexible. It will be rich in nature. And since each said strip | belt-shaped member F121 has connected right and left side part F11, it can receive a load firmly by each strip | belt-shaped member F121. That is, if it is such, it is possible to obtain a sense of security that firmly supports the weight while being the seat plate F1 that is easily deformed.

  Moreover, since the opening F123 is three-dimensionally formed between the adjacent belt-like members F121, the air permeability is good.

  In addition, about the seat board F, the further deformation | transformation aspect can also be considered. The intermediate portion F12 in the seat plate F shown in FIGS. 39 and 40 has a plurality of strip-like members F121 having a shape protruding on both the upper and lower sides in the thickness direction, arranged adjacent to each other via a gap, and adjacent strip-like members. A structure is formed in which F121s are connected to each other at a plurality of positions by connecting pieces F124.

  Each of the belt-like members F121 is disposed so as to connect two portions of the peripheral edge portion F11 facing each other, and has a shape that can be connected to be elastically deformable with a longer path than connecting the two portions of the peripheral edge portion F11 with a straight line. ing. Each belt-like member F121 connects the left and right side portions F11 of the peripheral edge portion F11 at the same front-rear position.

  Each band-shaped member F121 has a wave shape that repeatedly protrudes and sinks at a constant cycle in the plate thickness direction, and the adjacent band-shaped members F121 are shifted in phase by 180 ° from each other. And in the intermittent position where the side edges of the adjacent belt-like members F121 are closest to each other, the belt-like members F121 are connected to each other via a connecting piece F124. Specifically, each band member F121 and the connecting piece F124 are arranged so as not to overlap each other with the adjacent band member F121 when viewed from a direction orthogonal to the seat plate body F1. The side edges of the matching belt-like member F121 are connected to each other through a connection piece F124. That is, the band-shaped members F121 are connected to each other via the connection piece F124 at a thickness direction position that is substantially flush with the peripheral edge F11.

  And in the part which is not connected, the opening F123 which connects the front side and back side of the seat-plate main body F1 between the adjacent strip | belt-shaped members F121 is formed. The opening F123 is formed intermittently based on the phase shift of the belt-like member F121. Each of these band-like members F121 has a linear shape in a line of sight from a direction orthogonal to the seat plate body F1, and is arranged in parallel.

  The connecting piece F124 has a small shaft shape and is integrally connected to the belt-like member F121. That is, the seat plate F shown in FIGS. 39 and 40 is a resin-integrated molded product including the belt-like member F121 and the connecting piece F124. The connection points F122 between the belt-like members F121 are regularly present at regular intervals in the front, rear, left, and right, and the connection pieces F124 are arranged at the connection points F122, respectively.

  In the seat plate F shown in FIGS. 39 and 40, the peripheral edge portion F11 including the front portion F112 and the rear portion F113 supported by the support frame 3 is a rigid region. Further, a belt-like member F121 that can be elastically deformed, and a slit (gap) that communicates vertically between the belt-like members F121 are provided in a portion other than the peripheral edge F11, and the belt-like member F112 is more than the peripheral edge F11. It becomes a deformation region where elastic deformation is easy. As a result, the intermediate portion F12 can be displaced along the thickness direction of the seat plate F when receiving the load of the seated person. In particular, in the seat plate F shown in FIGS. 39 and 40, a gap is formed even in a plan view, so that the air permeability is better.

  As other configuration changes, for example, the belt-like member is not limited to projecting on both the upper and lower sides, and may project only on the lower surface (back surface) side.

  In the example shown in FIGS. 37 to 40, the phase of the protrusions and depressions between the adjacent belt-like members F121 is shifted by 180 °, but various changes may be made such as shifting the phase by 30 ° or 60 °. In the example shown in FIG. 41, the phase shift between the two adjacent band-shaped members F121 is set to a value different from 180 °, and specifically, the phase is shifted by 30 °. If it is such, the connection location F122 of each strip | belt-shaped member F121 will be located alternately in a plate | board thickness direction, ie, an up-down direction, and the adjacent connection piece F124 will also be located alternately in a plate | board thickness direction, ie, an up-down direction. The seat plate F shown in FIGS. 37 to 40 is formed with a gap in the plan view and the front view. However, the plate F shown in FIG. A gap F125 is formed so that the gap between F124 can be seen. That is, the gap F125 is formed between the adjacent connection members F121 and the adjacent connection pieces F124 within the plate thickness, and the air permeability is further improved.

  In the example shown in FIGS. 37 to 41, each belt-like member F121 has a wave shape and the amplitude and period thereof are constant. However, a combination of belt-like members having different amplitudes or periods may be used.

  The cross-sectional shape of the belt-like member F121 may be a shape in which a corner edge is eliminated, such as a circular shape or an elliptical shape. In such a case, even if the belt-like member F121 is bent downward by sitting and twisted in the front-rear and left-right directions, the belt-like member F121 does not have a corner edge, and therefore the corner edge may hit the seated person. The sitting comfort is further improved. The cross-sectional shape of the connecting piece F124 can also be made such that the corner edge portion is eliminated in the same manner as the band-shaped member F121 described above.

  The seat plate F may be one in which the upper surface of the seat plate main body F1 is covered with a stretch fabric, or further, a cushion interposed between the stretch fabric and the seat plate main body F1.

  The belt-like member F121 (further, the connecting piece F124) is not necessarily provided in the entire intermediate portion F12. The belt-like member F121 (and connection piece F124) may be provided only in a partial region of the intermediate portion F12. As an example, it may be considered that the belt-like member F121 (and the connecting piece F124) is provided dispersed in a plurality of regions of the intermediate portion F12.

  Other specific configurations of each part can be variously modified without departing from the spirit of the present invention.

  The present invention can be used as, for example, a chair for a school, a conference hall, an office meeting room, or the like.

DESCRIPTION OF SYMBOLS 1 ... Seat plate 112 ... Intermediate | middle part 12 ... Front side attachment body 13 ... Rear side attachment body 3 ... Support frame 31 ... Side plate 32 ... Recessed part 33 ... Front side support part 34 ... Back side support part 4 ... Support shaft ( Back frame)
5 ... Horizontal member (front frame)

Claims (11)

It is a chair provided with a resin seat plate so that it can be turned up and down around a support shaft of a chair body having a support shaft with its axis oriented in the left-right direction,
A support frame disposed on the lower surface side of the seat plate and engaged with the support shaft so as to be vertically rotatable;
The front and rear of the seat plate so as to be able to displace the intermediate portion of the seat plate in the thickness direction the seat plate in a substantially horizontal use state is supported by the support frame,
A chair in which a front portion of the seat plate is slidable relative to a front support portion that supports a front portion of the seat plate in the support frame . It is a chair provided with a resin seat plate so that it can be turned up and down around a support shaft of a chair body having a support shaft with its axis oriented in the left-right direction,
A support frame disposed on the lower surface side of the seat plate and engaged with the support shaft so as to be vertically rotatable;
The front and rear portions of the seat plate are supported by the support frame so that the intermediate portion of the seat plate can be displaced in the thickness direction when the seat plate is used in a substantially horizontal state.
A mounting body protruding downward is integrally formed at the front and rear portions of the seat plate,
The support frame has a pair of side plates that are paired on the left and right sides, and both side plates sandwich the attachment body . A mounting body protruding downward is integrally formed at the front and rear portions of the seat plate,
The support frame includes a side plate forming a right and left pair claim 1 chair according to both side plates that sandwich the attaching body. The chair body includes a horizontal member that is disposed in front of the support shaft and extends in the left-right direction,
In the use state, a portion between the front support portion that supports the front portion of the seat plate in the support frame and the rear support portion that supports the rear portion of the seat plate is placed on the horizontal member. The chair according to claim 1, 2 or 3 . In the support frame, a recess is formed in a portion between a front support portion that supports the front portion of the seat plate and a rear support portion that supports the rear portion of the seat plate. The chair according to claim 4 , wherein a recessed portion is engaged with the horizontal member from above. Claim sites are spaced from the lower surface of the seat plate downward between the support portions of the rear side supporting the rear of the front support and the seat plate for supporting the front portion of the seat plate in the support frame 1 A chair according to 2, 3, 4 or 5 . The chair according to claim 1, 2, 3, 4, 5, or 6 , wherein the support shaft is sandwiched between a rear portion of the seat plate and a rear support portion that supports the rear portion of the seat plate in the support frame. Two sets of the support frames are provided,
The left front portion and the left rear portion of the seat plate are supported by one support frame, and the right front portion and the right rear portion of the seat plate are supported by the other support frame . A chair according to 4, 5, 6 or 7 . A portion including a front portion and a rear portion supported by the support frame in the seat plate is defined as a rigid region,
A thin region, a groove, a slit, a bottomed hole, a through-hole, or a deformable belt-like member is provided in a portion other than the rigid region, and the deformed region is more easily elastically deformed than the rigid region. The chair according to 4, 5, 6, 7 or 8. Claims 1, 2, wherein the seat plate is connected between a front part or a rear part supported by the support frame and a portion on which a seated person's buttocks is placed by an elastically deformable resin spring. A chair according to 3, 4, 5, 6, 7 or 8. The plurality of bases can be nested in the front-rear direction in a state in which the seat plate and the support frame are turned up and flipped upwards. 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 The listed chair.

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