JP6198317B2 - Board structure for chair and chair - Google Patents

Description

  The present invention relates to a chair substrate structure and a chair.

  Patent Documents 1-4 describe a technique in which a substrate that constitutes a backrest of a chair is a member that has a high degree of deformation tolerance due to an opening, while maintaining a single strength. Specifically, a technique in which an opening is not formed in the outer peripheral portion of the substrate, which is a connection portion to the chair body, and a high-rigidity portion is actively formed by increasing the plate thickness of the outer peripheral portion. Is disclosed. In these technologies, by supporting the outer periphery of the board on the strength member of the chair body, the deformation tolerance of the deformation part of the board is relatively large, and a large load can be applied. There is a design philosophy of maintaining strength.

Japanese Patent No. 3895084 Japanese Patent No. 4295266 Japanese Patent No. 5276304 Japanese Patent No. 5298328

In the above technique, in order to improve the bending of the deformed portion of the substrate, a plurality of slit-like openings long in a certain direction are arranged in the certain direction to form an opening row, and the opening rows are arranged in parallel while being shifted in the certain direction. In particular, the bending in the direction in which the slit-shaped opening is widened is made favorable.
However, if the size of the opening is simply increased in order to achieve a greater deflection, the rigidity (load supporting force) of the substrate may be impaired. Further, since the remaining portion formed so as to avoid the opening affects the design of the chair when the substrate is exposed to the outside, further contrivance is demanded.

  The present invention has been made in view of the above circumstances, and the chair substrate structure that contributes to the improvement of the design of the chair while maintaining the rigidity and ease of bending of the substrate constituting the load support member of the chair, and the same Provide the chair used.

In order to achieve the above object, the present invention employs the following means.
That is, the board structure for a chair according to the present invention is a board structure for a chair adopted as a load support member of a chair, and the board constituting the load support member includes a slit forming region having a plurality of slit pairs, The slit pair has a pair of slit-shaped openings arranged in parallel to each other and a substrate remaining portion sandwiched between the pair of openings, and the slit pair is a row orthogonal to the arrangement direction of the openings. A plurality of slit rows are formed side by side in the direction, and the slit formation region is formed by arranging a plurality of slit rows in the row direction, and the adjacent slit rows in the row direction are shifted from each other in the row direction. It is characterized by being.

According to this configuration, by arranging a slit pair in which a pair of slit-shaped openings are arranged on the substrate, the slit pair functions as one large opening to improve the bending of the substrate. As the substrate remaining portion crosses the center of the portion, an appropriate rigidity is ensured by the substrate remaining portion.
That is, as compared with a case where the size of the opening is simply increased, a load supporting force is obtained by the remaining portion of the substrate, so that it is possible to ensure the rigidity of the substrate while allowing a flexible deformation of the slit forming region. it can.
In addition, the slit pairs that are larger than a single opening are regularly formed side by side, making it easy to recognize as a geometric pattern even at a distance, and in combination with the effect of reducing the opening area of the substrate, it also improves the design Can contribute.
In addition, the said load support member is a concept also including a lumbar support, a headrest, etc. other than a seat body and a backrest.

In the board structure for a chair according to the present invention, the slit rows are formed by arranging a plurality of the slit pairs at equal intervals in the row direction, and the slit rows adjacent in the row direction are mutually equal in the row direction. It may be configured to be shifted by a half pitch of the interval.
According to this configuration, the slit pairs are arranged in a staggered manner, and the slit forming region can be more easily deformed.

Moreover, the board | substrate structure for chairs which concerns on this invention is the outer convex opening part as the said opening part curved or bent so that at least one of the said several slit pair may become convex on the outer side of the said slit pair in the said alignment direction. The structure formed by may be sufficient.
According to this configuration, both ends of the substrate remaining portion inside the slit pair become narrow, and a flexible load supporting force by the substrate remaining portion can be obtained.
In this case, an inner opening may be further formed in the remaining substrate portion between the pair of outer convex openings.
According to this structure, the board | substrate remaining part itself inside a slit pair can be bent easily, and the more flexible load support force by a board | substrate residual part can be obtained.

In the chair substrate structure according to the present invention, at least one of the plurality of slit pairs is an inwardly convex opening as the opening that is curved or bent so as to be convex inward of the slit pair in the arrangement direction. The structure formed by may be sufficient.
According to this configuration, the middle portion of the substrate remaining portion inside the slit pair becomes narrow, and the substrate remaining portion itself can be easily bent to obtain a flexible load supporting force.
In this case, an end opening may be further formed between the slit pairs that are formed by the inner convex openings and are adjacent in the column direction.
According to this configuration, the end portion of the substrate remaining portion inside the slit pair can be easily bent, and a more flexible load supporting force by the substrate remaining portion can be obtained.

A chair according to the present invention includes a leg, a seat supported by the leg, and a backrest, wherein the backrest includes a board having any one of the chair substrate structures described above. The substrate forms the slit forming region from above to the lower back support portion of the backrest, and the portion below the waist support portion in the slit formation region forms the opening portion in the row. It is a divided slit forming region that is divided in the direction to form a divided opening.
According to this configuration, it is possible to configure a backrest that exhibits the various effects described above.
In particular, in the split slit forming region, the slit pair is divided into a plurality of divided openings along the shape of the opening, so that the size of the opening is reduced to suppress the opening area of the substrate and the divided divided openings. Substrate remaining portions remain between the portions to increase the rigidity of the substrate.
That is, below the lower back support portion in the backrest, the divided slit formation region can increase the rigidity of the substrate and favorably support the seated person's lower back portion. Moreover, the same pattern can be formed in the entire slit forming region, which can contribute to improvement in design.

  ADVANTAGE OF THE INVENTION According to this invention, the board | substrate structure for chairs which contributes also to the improvement of the design property of a chair, and a chair using the same are maintained, maintaining the rigidity and ease of bending of the board | substrate which comprises the load support member of a chair. Can do.

It is the perspective view which looked at the chair in embodiment of this invention from the back side and upper side of the backrest. It is the front view which looked at the said chair from the front side of the backrest. It is the III section enlarged view of FIG. It is the IV section enlarged view of FIG. It is explanatory drawing equivalent to FIG. 3 which shows the modification of this embodiment. It is explanatory drawing equivalent to FIG. 3 which shows the other modification of this embodiment.

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

As shown in FIGS. 1 and 2, the chair 1 of the present embodiment includes a multi-leg 7 with casters 7 a placed on a floor F, a pedestal 8 standing from the center of the multi-leg 7, and a leg. A box-like support base 3 attached to the upper end of the column 8, a seat 4 supported above the support base 3, a frame-like backrest support member 9 supported on the support base 3 so as to be reclining, A backrest 10 attached to the front surface of the backrest support member 9.
In the present embodiment, the structure including the multi-leg 7, the pedestal 8, the support base 3, and the back support member 9 may be referred to as the chair body 2. In addition, the chair 1 in the drawing further includes a pair of left and right armrests 6 on which support columns are supported on the left and right side portions of the lower surface of the seat body 4 or the left and right side portions of the support base 3.

  The backrest 10 is composed of only a synthetic resin substrate 14, for example. The backrest 10 (substrate 14) has a substantially rectangular shape when viewed from the front (front view), and a portion having a height slightly lower than the upper and lower intermediate portions is defined as a boundary portion 11, and the left and right widths of the upper portion are on the lower side. It is formed wider than the lateral width of the part. The boundary portion 11 is set to a height equivalent to the upper surface of the armrest 6, for example. Hereinafter, the upper part is referred to as a wide part 12 and the lower part is referred to as a narrow part 13.

The substrate 14 has a configuration in which a region excluding the outer peripheral portion is formed as a slit forming region 15 in which many slit pairs, which will be described in detail later, are formed, and the outer peripheral portion is formed as a frame portion 16 having relatively high rigidity without forming the slit pairs. Have.
The frame portion 16 is continuously formed over the four sides of the backrest 10 that are rectangular in a front view. The part located in the left and right both sides of the wide part 12 in the frame part 16 is a wide frame part 16a having a wider left and right width than other parts. The left and right support portions 9a of the backrest support member 9 are arranged along the back surfaces (rear surfaces) of the left and right wide frame portions 16a.

  The backrest support member 9 in the figure includes left and right support portions 9a, an upper side portion 9b that connects the upper ends of the left and right support portions 9a at positions spaced rearward of the upper end portion of the backrest 10, and left and right support portions. Left and right lower extending portions 9c extending downward from the lower ends of the narrow portions 13 from the lower ends of the narrow portions 13; a lower side portion 9d connecting the lower ends of the left and right lower extending portions 9c; And a base portion 9e extending from the left and right central portion of the portion 9d toward the support base 3. The backrest support member 9 of the present embodiment has a U-shaped lower portion having left and right downward extending portions 9c and a lower side portion 9d. However, the present invention is not limited to this. You may make the Y-shape which connects the lower end of the part 9a, and the upper end of the base 9e.

  In the backrest 10, the left and right wide frame portions 16 a are fixedly supported by the left and right support portions 9 a of the backrest support member 9, and the left and right middle portions of the lower end portion are fixed to the left and right lower end portions of the backrest support member 9. Fixedly supported by the middle part. The backrest 10 is rich in flexibility with respect to the backrest support member 9 having a relatively high rigidity, and flexes the portion excluding the fixing portion to the backrest support member 9 by the load from the seated person. On the other hand, the strength and rigidity of the backrest 10 is ensured by the chair body 2 including the backrest support member 9.

  The backrest 10 has a curved shape that is convex backward in plan view (top view) along the back of the seated person, and the boundary portion in side view so that the waist of the seated person can be easily supported from behind. 11 is a gently bent shape with a convex top. The boundary portion 11 constitutes a waist support portion 11a that supports the waist of the seated person from behind.

  As shown in FIGS. 3 and 4, the slit forming region 15 is a large slit forming region 15 a having a relatively large opening area ratio in the wide portion 12, and a small opening area ratio in the narrow portion 13. The slit forming region 15b is used. Since the ratio of the opening area of the slit forming region 15 affects the ease of bending deformation, the large slit forming region 15a is relatively easy to bend and the small slit forming region 15b is relatively difficult to bend and deform.

  Referring to FIG. 3, the slit forming region 15 forms a slit pair by arranging a pair of slit-like openings that are long in the vertical direction in the left-right direction, and forms a slit row by arranging a plurality of these slit pairs at equal intervals in the vertical direction. Further, a plurality of slit rows are arranged in the left-right direction, and adjacent slit rows are formed so as to be shifted from each other in the vertical direction by the half pitch at equal intervals. In other words, the slit forming region 15 is formed by arranging a large number of slit pairs in a staggered manner. Hereinafter, the left-right direction in the slit forming region 15 may be referred to as a row direction, and the vertical direction may be referred to as a column direction.

  Note that the slit-shaped opening refers to a narrow opening generally extending in a predetermined direction in various forms such as a linear shape, a bent shape, and a curved shape. A slit pair indicates a unit formed by arranging a pair of identical or line-symmetric openings in parallel. The pair of openings in the pair of slits are recognized by separating at least both ends from each other.

  A pair of slits in the large slit forming region 15a includes an outer convex slit pair 22 formed by an outer convex opening 21 curved (or bent) so as to be convex outward in the arrangement direction of the pair of openings, and a pair of openings. And an in-convex slit pair 26 formed by in-convex openings 25 that are curved (or bent) so as to be convex inward in the arrangement direction of the portions. A plurality of outer convex slit pairs 22 are arranged in the vertical direction to form outer convex slit rows 23, and a plurality of inner convex slit pairs 26 are arranged in the vertical direction to form inner convex slit rows 27.

  The pitch in the vertical direction of the outer convex slit pair 22 in the outer convex slit row 23 and the pitch in the vertical direction of the inner convex slit pair 26 in the inner convex slit row 27 are the same. The vertical width of the outer convex slit pair 22 (outer convex opening portion 21) and the vertical width of the inner convex slit pair 26 (inner convex opening portion 25) are also the same. The outer convex slit rows 23 and the inner convex slit rows 27 are alternately arranged in the left-right direction, and are adjacent to each other and are shifted by a half pitch in the vertical direction.

  In the figure, reference numerals 21a and 25a are upper and lower ends of the openings 21, 25, reference numerals 22a and 26a are remaining substrate portions between the pair of openings 21 and 25 in the slit pairs 22 and 26, and reference numerals 23a and 27a are upper and lower. Remaining portions between the slit pairs remaining between the respective slit pairs 22 and 26 arranged in the same manner, reference numerals 24 and 28 are formed by connecting the remaining substrate portions 22a and 26a and the remaining portions 23a and 27a between the slit pairs in the respective slit rows 23 and 27. Substrate remaining rows 29, the reference numeral 29 indicates the remaining rows between the slit rows remaining between the adjacent slit rows 23 and 27, respectively.

  The upper and lower ends of the substrate remaining portion 22 a of the outer convex slit pair 22 are narrowed in the left-right width by the upper and lower ends 21 a of the pair of outer convex openings 21 being close to each other. Thereby, the deformation | transformation including the twist around the axis in the up-down direction in the board | substrate residual part 22a of the outer convex slit pair 22 becomes favorable. An elliptical inner opening 22b that is long in the vertical direction is further formed at the center of the substrate remaining portion 22a of the outer convex slit pair 22.

  On the other hand, the upper and lower end portions of the substrate remaining portion 26a of the pair of inner convex slits 26 are widened by separating the upper and lower end portions 25a of the pair of inner convex openings 25 from each other. The remaining portion 27a between the pair of inner convex slits 26 arranged vertically is long in the vertical direction so as to enter between the upper and lower end portions 25a of the pair of inner convex openings 25 in the pair of inner convex slits 26 sandwiching this. An elliptical end opening 26b is formed. Thereby, the deformation | transformation of the board | substrate residual part 26a of the inner convex slit pair 26 becomes favorable. Since the intermediate portion of the remaining substrate portion 26a has a narrow left-right width, the remaining substrate portion 26a itself is also flexibly deformed.

  On the left and right sides of the remaining portions 23a between the slit pairs of the outer convex slit row 23 (left and right sides of each inner convex slit pair 26 of the inner convex slit row 27) in the remaining rows 29 between the slit rows, respectively, elliptical shapes that are long vertically. Inter-column openings 29a are formed. As a result, an elliptical opening that is long in the vertical direction is formed in each of the remaining substrate rows 24 and 28 and the remaining rows 29 between the slit rows, which contributes to improving the flexibility of the entire slit forming region 15.

The slit forming region 15 is defined as a large slit forming region 15a on the upper side and a small slit forming region 15b on the lower side with the waist support portion 11a convex forward in the backrest 10.
Referring to FIG. 4, the small slit forming region 15b is obtained by dividing the vertically long slit-like openings 21 and 25 in the large slit forming region 15a into two divided openings 31 and 35 in the column direction. . Thereby, the inter-division remaining portions 31a and 35a are also formed between the divided opening portions 31 and 35, and the opening area is suppressed and the rigidity is increased as compared with the large slit forming region 15a. Since the divided opening 31 is formed so as to follow the shape of the slit-shaped opening 21 before the division, and the divided opening 35 is formed so as to follow the shape of the slit-shaped opening 25 before the division, the entire slit forming region 15 is formed. A similar pattern is formed.

Hereinafter, the operation of the slit forming region 15 will be described.
First, when a backward load is input to the backrest 10 (substrate 14) from the body of the seated person, the pair of openings 21 and 25 that form the respective slit pairs 22 and 26 are vertically long and vertically long. Therefore, it is deformed so as to spread in the left-right direction (alignment direction). Therefore, each slit pair 22 and 26 is deformed so as to spread in the left-right direction as a whole.
Moreover, since the slit pairs 22 and 26 arranged in the left-right direction are in a state shifted from each other in the vertical direction (column direction), the openings 21 and 25 forming the slit pairs 22 and 26 are also shifted in the vertical direction. It becomes a state. For this reason, when the openings 21 and 25 are deformed to expand in the left-right direction, the openings 21 and 25 adjacent in the left-right direction can be deformed without being inhibited.
At this time, since the remaining substrate portions 22a and 26a are formed in the respective slit pairs 22 and 26, excessive spread of the respective slit pairs 22 and 26 is suppressed, and appropriate rigidity and good sitting comfort are maintained. Can do.

  As described above, the board structure for a chair in the above embodiment is adopted as a load support member of the chair 1, and the board 14 constituting the load support member has the slit-like openings 21 and 25 arranged in parallel. A pair of slits 22 and 26 sandwiching the remaining substrate portions 22a and 26a, and a plurality of slit pairs 22 and 26 are arranged in a row direction perpendicular to the direction of the openings 21 and 25 to form slit rows 23 and 27. A plurality of the slit rows 23 and 27 are arranged in the arrangement direction, and the slit formation regions 15 are formed by arranging the adjacent slit rows 23 and 27 so as to be shifted from each other in the row direction.

According to this configuration, by arranging the slit pairs 22 and 26 in which the pair of slit-shaped openings 21 and 25 are arranged on the substrate 14, the slit pairs 22 and 26 function as one large opening and the substrate 14. On the other hand, the substrate remaining portions 22a and 26a cross the center of the large opening so that appropriate rigidity is ensured by the substrate remaining portions 22a and 26a.
That is, since the load supporting force by the remaining substrate portions 22a and 26a can be obtained as compared with the case where the size of the opening is simply increased, the rigidity of the substrate 14 is allowed after allowing the flexible deformation of the slit forming region 15. Can be secured.
In addition, since the slit pairs 22 and 26 larger than the single opening are regularly arranged side by side, it can be easily recognized as a geometric pattern even at a distance, and coupled with the effect of reducing the opening area of the substrate 14, the design characteristics It can also contribute to improvement.

  The slit rows 23 and 27 are formed by arranging a plurality of the slit pairs 22 and 26 at equal intervals in the row direction, and the slit rows 23 and 27 adjacent in the row direction are mutually connected in the row direction. Since the slit pairs 22 and 26 are arranged in a staggered manner by being shifted by an equal interval half pitch, the slit forming region 15 can be more easily deformed.

In addition, the slit forming region 15 includes an outer convex slit pair 22 formed by an outer convex opening portion 21 that is curved or bent so as to be convex to the outside of the slit pair in the arrangement direction. The both ends of the substrate remaining portion 22a on the inner side of the substrate 22 become narrower, and a flexible load supporting force by the substrate remaining portion 22a can be obtained.
Further, the inner opening 22b is further formed in the remaining substrate portion 22a between the pair of outer convex openings 21, thereby making it easier to bend the remaining substrate portion 22a itself inside the outer convex slit pair 22, and the remaining substrate portion. More flexible load bearing force by 22a can be obtained.

Further, the slit forming region 15 has an inwardly convex slit pair 26 formed by an inwardly convex opening 25 that is curved or bent so as to be convex inwardly of the slit pair in the arrangement direction. 26, the middle of the substrate remaining portion 26a on the inner side becomes narrow, and the substrate remaining portion 26a itself can be easily bent to obtain a flexible load supporting force.
Further, an end opening 26b is further formed between the inner convex slit pairs 26 adjacent in the column direction, so that the end of the substrate remaining portion 26a inside the inner convex slit pair 26 can be easily bent. A more flexible load supporting force can be obtained by the remaining portion 26a.

  And the chair 1 of this embodiment is provided with the leg body, the seat 4 and the backrest 10 supported by the said leg body, and the said backrest 10 comprises the board | substrate 14 which comprised the said board | substrate structure for chairs. And the substrate 14 forms the slit forming region 15 from the upper side to the lower side of the waist support portion 11a of the backrest 10, and a portion below the waist support portion 11a in the slit formation region 15 is formed. The opening portions 21 and 25 are divided in the column direction to form small slit forming regions 15b which are divided opening portions 31 and 35.

According to this configuration, it is possible to configure the backrest 10 that exhibits the various effects described above.
In particular, in the small slit forming region 15b, the slit pair 22, 26 is divided into a plurality of divided openings 31, 35 along the shape of the openings 21, 25. The opening area is reduced, and the inter-division remaining portions 31a and 35a remain between the divided divided openings 31 and 35, and the rigidity of the substrate 14 is increased.
That is, below the waist support part 11a in the backrest 10, the rigidity of the substrate 14 can be increased by the small slit forming region 15b, and the seated person's waist part can be favorably supported. Moreover, the same pattern can be formed in the entire slit forming region 15, which can contribute to improvement in design.

  In addition, this invention is not restricted to the said embodiment, For example, you may form a slit pair only by the linear opening part extended in one direction. Moreover, you may form a slit pair by the opening part formed by the curve and bending | flexion of two or more places instead of one curve or bending | flexion.

FIG. 5 shows an example in which a slit pair is formed by a wave-shaped opening having, for example, three concave and convex curved portions. The opening is formed by an inward slit pair 122 formed by an inward opening 121 whose upper and lower ends are directed inward in the arrangement direction, and an outer opening 125 formed by the upper and lower ends directed in the arrangement direction outside. The orientation slit pair 126 is divided. A plurality of inward slit pairs 122 are arranged in the vertical direction to form inward slit rows 123, and a plurality of outward slit pairs 126 are arranged in the vertical direction to form outward slit rows 127. The slit rows 123 and 127 are alternately arranged and are shifted from each other by a half pitch. Between each slit row and adjacent slit rows, an elliptical small opening 128 that is vertically long is appropriately formed.
Also in this example, each pair of slits 122, 126 spreads well in the left-right direction, and excessive spread of each pair of slits 122, 126 is suppressed by the remaining substrate portion between the openings, so that moderate rigidity and good sitting comfort are achieved. realizable.

FIG. 6 shows an example of the slit pair 222 that integrates a predetermined range between the upper and lower sides of a pair of opening portions 221 to form a joining portion 222a. A plurality of slit pairs 222 are arranged in the vertical direction to form a slit row 223. A plurality of slit rows 223 are arranged side by side while being shifted by a half pitch up and down. The upper and lower ends of each opening 221 in the slit pair 222 are branched from each other, for example, curved so that the upper and lower ends are directed in the vertical direction to form a U shape. In addition, the shape of the said part may be V shape etc. which the upper-lower-end part branched. The remaining portion 223a between the slit pairs remaining between the vertically aligned slit pairs 222 is supported by the remaining portion 224 between the slit rows. An elliptical small opening 223b that is long in the vertical direction is formed at the center of the slit pair remaining portion 223a.
In this example, the joining part 222a also spreads in the left-right direction, so that the slit pair 222 can be more easily spread.

Here, the load support member to which the chair substrate structure is applied may be a lumbar support, a headrest, or the like in addition to the seat body 4 and the backrest 10. The load support member may have a configuration in which a cushion material and a skin are provided on the substrate. That is, the substrate may not constitute the entire load support member as in the above embodiment, but the substrate may constitute a part of the load support member.
The above-described configuration is an example of the present invention, and various modifications can be made without departing from the gist of the invention.

DESCRIPTION OF SYMBOLS 1 Chair 4 Seat 10 Backrest 11a Lumbar support part 14 Substrate 15 Slit formation area 15b Small slit formation area (divided slit formation area)
21 Outer convex opening (opening)
22 Outer convex slit pair (slit pair)
22a, 26a Substrate remaining part 22b Inner opening 23 Outer convex slit row (slit row)
25 Inward convex opening (opening)
26 Inward convex slit pair (slit pair)
26b End opening 27 Inner convex slit row (slit row)
31, 35 split opening

Claims (7)

In the board structure for a chair adopted as a load supporting member of the chair,
The substrate constituting the load supporting member includes a slit forming region including a plurality of slit pairs,
The slit pair has a pair of slit-shaped openings arranged in parallel to each other and a substrate remaining portion sandwiched between the pair of openings, and the slit pair is a row orthogonal to the arrangement direction of the openings. A plurality of slit rows are formed side by side in the direction,
The slit formation region is formed by arranging a plurality of the slit rows in the alignment direction,
The board structure for a chair according to claim 1, wherein the slit rows adjacent in the row direction are shifted from each other in the row direction. The slit row is formed by arranging a plurality of the slit pairs at equal intervals in the row direction,
2. The chair substrate structure according to claim 1, wherein the slit rows that are adjacent in the row direction are arranged so as to be shifted from each other in the row direction by the equally spaced half pitch.   2. At least one of the plurality of slit pairs is formed by an outer convex opening as the opening that is curved or bent so as to be convex outward of the slit pair in the arrangement direction. Or the board | substrate structure for chairs of 2.   The board | substrate structure for chairs of Claim 3 with which an inner side opening part is further formed in the board | substrate residual part between a pair of said outer convex opening parts.   2. At least one of the plurality of slit pairs is formed by an inwardly convex opening as the opening that is curved or bent so as to protrude inward of the slit pair in the arrangement direction. The board | substrate structure for chairs as described in any one of 1-4.   The board structure for a chair according to claim 5, wherein an end opening is further formed between the pair of slits formed by the inwardly convex openings and adjacent in the row direction. In a chair comprising a leg, and a seat and a backrest supported by the leg,
The backrest has a board comprising the chair board structure according to any one of claims 1 to 6,
The substrate forms a slit formation region from above to below the back support portion of the backrest,
The chair, wherein a portion of the slit forming area below the waist support part is a divided slit forming area obtained by dividing the opening in the row direction to form a divided opening.

Images