JP6960824B2 - Chair - Google Patents

Description

The present invention relates to a chair.

As a chair provided with a backrest and an accoudoir connected to the backrest, for example, the chairs disclosed in Patent Documents 1 and 2 below are known.
First, in the chair disclosed in Patent Document 1, the lower portion of the rear rod 24 of the armrest 20 is placed in a recess 17 formed so as to open outward on the outer surface in the width direction of the frame member 10 constituting the backrest. By engaging and screwing the bolt B1 inserted from the outside of the rear chair 24 into the female screw formed on the frame member 10, the armrest 20 is prevented from rotating due to the load from above. In addition, it is supported by the backrest 6. By adopting such a configuration, the armrest can be firmly supported against the backrest.
The bolt that connects the backrest and the armrest in this way is generally shielded from problems such as design and the risk of injury when the seated person touches the hand. In this chair, the portion where the bolt B1 is inserted is a recess 18 which is stepped down as compared with other portions, and the open end portion of the recess 18 is shielded by the cover member 19. Further, in consideration of the above moment, a pair of upper and lower bolts B1 are provided. With this configuration, the bolt B1 can be easily shielded at low cost, but since the cover member 19 has a wide surface and is exposed to the outside of the chair and does not require strength, it is easy to see and remove.

As a means for solving this problem, it is conceivable to adopt the configuration disclosed in Patent Document 2. In this configuration, the inward facing portion 47 in which the elbow rest portion 20 of the accoudoir 19 extends inward is screwed into the back outer shell 9 by a bolt 52 inserted from the front. By adopting this configuration, the connecting portion between the backrest and the armrest is accommodated inside the backrest, so that it is not necessary to provide a cover member.

Japanese Unexamined Patent Publication No. 2017-086278 Japanese Patent No. 5873304

However, in the configuration of Patent Document 2, since the bolt 52 is inserted from the front, the load input to the upper surface of the elbow rest portion 20 is converted into a moment in the direction of peeling the inward facing portion 47 forward. , There is still room for improvement in terms of strength.
The present invention has been made in view of the above technical problems, and provides a chair capable of sufficiently resisting an armrest load by increasing the joint strength around the upper end of the armrest when fixing the armrest to the support structure. The purpose is to do.

As a means for solving the above problems, the present invention provides a chair in which an armrest is fixed to a support structure by a fastening member, the chair includes a fastening member insertion portion that opens to an upwardly facing portion of the armrest, and is inserted through the fastening member insertion portion. Provided is a chair characterized in that the armrest is fastened to the support structure by the fastening member.
According to this configuration, it is possible to fix the upper end portion of the armrest to the support structure by using the fastening member insertion portion that opens upward of the armrest. Therefore, the strength of connection to the support structure around the upper end of the armrest can be increased, and an armrest that can sufficiently withstand the armrest load can be obtained.

In the present invention, the opening of the fastening member insertion portion facing upward of the armrest may be shielded by a shielding member.
In this case, the opening of the fastening member insertion portion facing upward of the armrest is shielded by the shielding member to make it inconspicuous, and the influence on the appearance of the chair can be suppressed.

In the present invention, the armrest includes an armrest main body on which the fastening member insertion portion is formed and a pad attached to an upper surface portion of the armrest main body, and the fastening member insertion portion is formed on the armrest main body. The opening of the fastening member insertion portion facing upward of the armrest may be configured such that the pad is shielded as the shielding member.
In this case, an opening of the fastening member insertion portion facing upward of the armrest is formed in the armrest body, and this opening is shielded by the pad of the armrest. Therefore, the number of parts is reduced as compared with the case where a dedicated shielding member is provided. At the same time, the influence on the appearance of the chair can be further suppressed.

In the present invention, the armrest main body includes a fixing portion fixed to the support structure and an elbow rest portion extending forward from the upper part of the fixing portion and forming an upper surface portion facing upward of the armrest. The fastening member insertion portion may be provided at the upper part of the fixing portion and at the rear portion of the armrest portion.
In this case, the rear part of the armrest portion, which is the upper part of the fixing portion of the armrest body to the support structure, is directly fixed to the support structure by using the fastening member insertion portion. The upper end of the same height is fixed to the support structure. Therefore, the bond strength with respect to the elbow rest load can be effectively increased. That is, when an elbow resting load is applied to the elbow resting portion extending forward from the upper part of the fixing portion, a moment in the direction of pulling away from the support structure acts on the upper part of the fixing portion and the rear part of the elbow resting portion. By fastening the rear portion of the elbow rest portion to the support structure, a force that resists the moment can be effectively obtained.

In the present invention, the fixing portion may be configured to include a second fastening portion to be fastened to the support structure below the fastening member insertion portion.
In this case, since the fixing portion of the armrest body is fastened to the support structure at both the upper part and the lower part, the armrest body can be stably fixed to the support structure.

In the present invention, the support structure may include a backrest, and the armrest may be fixed to the backrest.
In this case, since the upper end portion of the armrest is fixed to the backrest by using the fastening member insertion portion that opens upward of the armrest, the joint strength of the armrest with respect to the armrest load can be increased. In particular, since the backrest is separated from the elbow resting position to the rear, the moment acting on the joint portion of the armrest becomes large, and a force that opposes this moment can be effectively obtained.

In the present invention, the fastening member insertion portion extends inclinely from the opening facing upward of the armrest so as to be located inward in the chair width direction toward the lower side, and the fastening member is extended along the fastening member insertion portion. The armrest may be fastened to the support structure.
In this case, not only the armrest and the support structure can be fastened in the vertical direction, but also the armrest and the support structure can be fastened in the chair width direction by the fastening member along the inclination of the fastening member insertion portion. It is possible to increase the degree of freedom in setting the connection structure of.

According to the present invention, when fixing an armrest to a support structure, it is possible to provide a chair capable of sufficiently resisting an armrest load by increasing the coupling strength around the upper end portion of the armrest.

It is a perspective view of the chair which concerns on this embodiment. It is a left side view of the above chair. It is a left side view around the armrest of the chair. It is a perspective view around the armrest of the chair. FIG. 3 is a sectional view taken along line VV of FIG. FIG. 3 is a sectional view taken along line VI-VI of FIG. FIG. 3 is a cross-sectional view taken along the line VII-VII of FIG. It is a perspective view which looked up at the said chair from below. It is a perspective view which shows the attachment structure around the rear part of the armrest of the chair. It is a rear view of the above chair.

Hereinafter, the chair according to the embodiment of the present invention will be described with reference to the drawings.
In the following description, for convenience, the direction in which the user (seat person) seated in the chair 1 faces forward is "forward", the opposite direction is "rear", that is, the lateral direction along the paper surface of FIG. 2 is the front-back direction or Called the depth direction. Further, the direction connecting the floor side on which the chair 1 is installed and the opposite side is referred to as a vertical direction, and the width direction of the chair 1, that is, the direction orthogonal to the paper surface of FIG. 2 is referred to as a left-right direction or a width direction. At appropriate locations in the figure, an arrow X indicating the width direction of the chair 1, an arrow Y indicating the depth direction of the chair 1, and an arrow Z indicating the vertical direction of the chair 1 are shown.

As shown in FIGS. 1 and 2, the chair 1 includes a leg body 2 having a plurality of (five) leg rods 2a arranged radially in a plan view. A caster 2b that comes into contact with the floor surface F is provided at the tip of each leg rod 2a. A telescopic pedestal 3 with a built-in gas spring stands in the center of the leg body 2. The pedestal 3 has an outer cylinder 3a forming the lower part and an inner cylinder 3b forming the upper part so as to be relatively rotatable. The rear portion of the support base 4 is fixed to the upper end of the pedestal 3. The support base 4 supports the backrest support rod 6 that supports the backrest 5 so as to be tiltable (rotatable), and can tilt the seat body 14 that forms the seating surface 14b in conjunction with the backrest support rod 6. Supports.

The backrest support rods 6 are provided in pairs on the left and right, and each has an L-shape when viewed from the side. The backrest support rod 6 is made of a metal material such as an aluminum alloy. The backrest support rod 6 includes a rear extending portion 6a extending rearward from a position adjacent to the side of the support base 4, a curved portion 6b connected to the rear end of the rear extending portion 6a and bending upward, and a curved portion 6b. It has an upward extending portion 6c which is connected to the upper end of the above and extends upward. The upward extending portion 6c is displaced outward in the width direction with respect to the rear extending portion 6a. The lower part of the backrest 5 is sandwiched and supported between the left and right upward extending portions 6c.

The rear portion of the armrest 20 is fixed to the outside of the upward extending portion 6c in the width direction. The upper surface of the armrest 20, that is, the elbow resting surface 31a is substantially at the same height as the upper end of the upward extending portion 6c. The elbow resting surface 31a is substantially at the same height as the front projecting portion 5a that supports the waist portion of the seated person in the backrest 5 from the rear. Hereinafter, the aggregate of the chair 1 excluding the armrest 20 will be referred to as a support structure 10.

The seat body 14 is supported so as to be slidable back and forth on the seat support member 14a connected to the backrest support rod 6. A seat support rod 6d extending upward is integrally provided at the front portion of the left and right backrest support rods 6. For example, the seat support rod 6d is integrally formed with the backrest support rod 6. In the figure, reference numeral C1 indicates the central axis of the rotation axis (reclining axis) that projects laterally to the support base 4 and supports the front end portion of the backrest support rod 6.

At the upper ends of the left and right seat support rods 6d, the rear portions of the seat receiving members 14a are rotatably supported via the rotation shaft of the axis C2 parallel to the axis C1 of the rotation shaft. The front portion of the seat receiving member 14a is rotatably supported by the upper ends of a pair of left and right link members 12 in an upright posture facing in the vertical direction via a rotation axis of an axis C3 parallel to the axis C1. There is. The lower end of the left and right link member 12 is rotatably supported on the front portion of the support base 4 via the rotation axis of the axis C4 parallel to the axis C1.

The backrest 5 and the sitting body 14 are viewed from the side shown in FIG. 2 via a four-section link-shaped interlocking mechanism 15 having a first section L1, a second section L2, a third section L3, and a fourth section L4. It can be linked.
When the backrest 5 rotates backward from the standing position (see FIG. 2) before tilting backward (before reclining) toward the reclining position, the seat body 14 is moved backward by the action of the interlocking mechanism 15. While tilting backwards.

With reference to FIG. 7, the backrest 5 has a substrate made of a wooden material such as plywood (hereinafter referred to as a backboard 7). A cushion and a skin material are arranged on the front surface side of the back plate 7 to form a backrest surface 5b. On the back side of the back plate 7, a back panel 5c extending to the curved portion 6b of the backrest support rod 6 is attached.

Hereinafter, the structure around the armrest 20 of the present embodiment will be described in detail. The areas around the left and right armrests 20 have a symmetrical structure to each other. In the following description, the area around the left armrest 20 shown in FIGS. 2 to 9 will be referred to, and the area around the right armrest 20 will be described. Omits the explanation. Further, in the following description, the vertical, front-back, and left-right directions of the armrest 20 are the same as the directions in which the armrest 20 is attached to the backrest support rod 6 (support structure 10) unless otherwise specified.

The armrest 20 includes an armrest body 21 supported by the backrest 5 and a pad 31 attached to the armrest body 21.
The armrest body 21 is integrally formed in a substantially triangular frame shape when viewed from the side. Like the backrest support rod 6, the armrest main body 21 is made of a metal material such as an aluminum alloy. The armrest body 21 includes an upper rod 22 extending in the front-rear direction, a front rod 23 extending rearward and downward from the front portion of the upper rod 22, and a rear rod 24 extending between the upper rod 22 and the rear end portion of the front rod 23. ,have. The rear rod 24 is fastened and fixed to the outside of the upward extending portion 6c of the backrest support rod 6 in the width direction by a pair of upper and lower bolts B1 (see FIG. 5) and the like.

The upper rod 22 is used as an elbow rest portion that supports the elbow and forearm of the seated person. The front end portion of the upper rod 22 is used as a portion for hanging the fingers of the seated person. Below the front end of the upper rod 22, an operating lever 23c that is mechanically connected to the support base 4 side via, for example, a wire cable or the like is arranged. The operation lever 23c can operate, for example, the reclining mechanism in the support base 4, the elevating mechanism of the support column, and the like.

The upper rod 22 is formed in a flat gutter shape with a reduced vertical width. A grid-like rib is formed in the upper rod 22. A pad 31 is attached to the upper rod 22 so as to cover the gutter-shaped upper surface portion (open portion) 22a of the upper rod 22 from above.

For example, the pad 31 is composed of, for example, a relatively soft synthetic resin surface body that forms an outer surface including the elbow rest surface 31a, and a relatively hard body that forms a mounting structure for the upper rod 22 while exteriorizing the surface body. It has a resin base body. The pad 31 uses two types of members made of different materials to achieve both the flexible feel of the elbow resting surface 31a and the strength of attachment to the upper rod 22. The pad 31 is integrally molded with the surface body and the base body by means such as two-color molding. The pad 31 may be integrally molded with the surface body and the base body by insert molding. Further, the pad 31 may be formed by fitting a front body and a base body which are separate from each other.

With reference to FIG. 4, a locking piece 32 for attaching the pad 31 is fixed to the upper surface side of the upper rod 22 by a screw 32a. The pad 31 is attached to the armrest 20 by moving backward along the upper surface portion 22a of the upper rod 22 in a state of being in contact with the upper surface portion 22a of the upper rod 22 from above. When the mold forming the internal shape of the upper rod 22 is die-cut in the vertical direction, the locking piece 32 overhangs, but by fixing the locking piece 32 as a separate body with screws, the large armrest body 21 The complexity of the mold forming the upper rod 22 in the above is suppressed.

The front rod 23 is oriented so as to be curved downward and rearward from a lower protruding portion 23a having an inverted triangular shape in a side view formed so as to protrude downward from the front portion of the upper rod 22 and a lower end portion of the lower protruding portion 23a. It has a lower rear extension portion 23b and a lower rear extension portion 23b. The operating lever 23c is supported by the downward projecting portion 23a, and the operating lever 23c projects in front of the downward projecting portion 23a. The front end portion of the upper rod 22 is arranged above the operating lever 23c and in front of the downward protruding portion 23a.

The rear rod 24 is inclined so as to be located rearward as it is located downward so as to follow the inclination of the lower part of the backrest 5 in a lateral view. With reference to FIG. 9, the rear rod 24 is offset inward in the width direction with respect to the upper rod 22 and the front rod 23. Inside the rear rod 24 in the width direction, a ridge 24a is formed along the length direction of the rear rod 24. The groove portion 6e into which the ridge 24a is fitted is formed on the outer side in the width direction of the upward extending portion 6c of the backrest support rod 6. Nut holes 24b for screwing bolts B1 are formed above and below the ridges 24a. The nut hole 24b is a bag hole that is closed on the outside in the width direction, and does not appear on the appearance when the rear rod 24 is viewed from the outside in the width direction. Bolt insertion holes 6f through which the bolt B1 is inserted are formed above and below the groove portion 6e.

By fitting the ridge 24a of the rear rod 24 into the groove portion 6e of the upward extending portion 6c, and screwing and tightening the bolt B1 inserted through the upper and lower bolt insertion holes 6f into the upper and lower nut holes 24b. , The rear portion of the armrest 20 is fastened and fixed to the upward extending portion 6c of the backrest support rod 6.

With reference to FIG. 10, a lower frame 8 made of, for example, a hard synthetic resin is attached to the lower part of the backrest 5. The lower frame 8 has a U-shape that opens upward in the front-rear direction, and is attached to the lower part of the back plate 7 of the backrest 5 by a plurality of bolts B2 that are substantially along the front-rear direction. The lower frame 8 has a lower side portion 8a extending in the width direction along the lower end of the back plate 7, and left and right side side portions 8b extending in the vertical direction along both lower ends of the back plate 7.

With reference to FIG. 7, female screw members N2 are embedded in the back plate 7 at a plurality of fastening points to be fastened to the lower frame 8. In the lower frame 8, bolt insertion holes 8c are formed at a plurality of fastening points to be fastened to the back plate 7. The lower frame 8 is fastened and fixed to the lower part of the back plate 7 by screwing and tightening the bolt B2 inserted into each bolt insertion hole 8c to the corresponding female screw member N2.

The left and right side portions 8b of the lower frame 8 have a U-shaped cross section that opens outward in the width direction. The assembled body of the lower frame 8 and the back plate 7 constitutes an integral backrest 5 together with the cushion, the back panel 5c, and the like. The assembly is inserted from above between the upward extending portions 6c of the left and right backrest support rods 6. At this time, the upward extending portion 6c is inserted and fitted between the front and rear wall portions of the left and right side portions 8b of the lower frame 8, and the backrest 5 is fitted in the front-rear direction, the vertical direction, and the left-right direction with respect to the backrest support rod 6. Positioning is done. In this state, the backrest 5 is fastened and fixed to the backrest support rod 6 by the first bolt B3 and the second bolt B4 described below.

As shown in FIGS. 5 and 9, the first bolt B3 used in the upper part of the upward extending portion 6c is a bolt that is obliquely inserted downward from the upper part of the armrest body 21 and inward in the width direction, and is a bolt of the lower frame 8. It is fastened to the upper part of the side side portion 8b.
As shown in FIGS. 5, 6 and 9, the second bolt B4 used in the lower part of the upward extending portion 6c is a bolt that is inserted substantially vertically upward from the lower part of the backrest support rod 6 and is a lower frame. It is fastened to the lower end of the side side portion 8b of 8.

A bolt insertion hole 25 that penetrates the rear portion of the upper rod 22 and the upper portion of the upward extending portion 6c along the inclination of the first bolt B3 is formed. The bolt insertion hole 25 has an opening 25a formed in the upper surface portion 22a of the rear portion of the upper rod 22 (which is also the upper end portion of the rear rod 24) (see FIG. 4), and the first bolt B3 is inserted through the opening 25a. , Screwed onto the nut N3 described below and tightened. The opening 25a of the bolt insertion hole 25 is shielded by the pad 31 together with the head of the first bolt B3.

With reference to FIG. 5, a rectangular recess 8d is formed inside the upper portion of the side portion 8b in the width direction so as to be substantially parallel to the inclination of the first bolt B3 in the front-rear direction. The L-shaped bracket 9 is arranged along the rear surface and the inclined surface of the recess 8d. In the bracket 9, the rear wall 9a is fixed to the back plate 7 and the lower frame 8 by the bolt B2. A nut N3 for screwing the first bolt B3 is arranged on the upright wall 9b of the inclined wall so that the first bolt B3 can be fastened.
As a result, the upper portions of the left and right side portions 8b of the lower frame 8 are coupled to the combined body of the backrest support rod 6 and the armrest 20 with fastening forces in the width direction and the vertical direction.

A "convex" -shaped recess 8e is formed in the lower portion of the side side portion 8b of the lower frame 8 when viewed in the front-rear direction. A nut N4 is inserted into the wide portion below the recess 8e from the front, and the nut N4 is held by a retaining screw. A bolt insertion hole 26 along the vertical direction is formed in the curved portion 6b of the backrest support rod 6, and the bolt insertion hole 26 is opened downward on the lower surface of the curved portion 6b. The second bolt B4 is inserted into the bolt insertion hole 26 from below, and the second bolt B4 is screwed into the nut N4 and tightened, so that the lower portion of the backrest 5 is fastened and fixed to the backrest support rod 6. ..

As described above, in the chair 1 of the present embodiment, the armrest 20 is fixed to the support structure 10 by fastening members (bolts B1 and B3), and the armrest 20 faces upward (armrest main body 21). The armrest 20 is provided with the fastening member insertion portion (bolt insertion hole 25) that opens in the upper surface portion 22a), and the armrest 20 is provided by the fastening member (first bolt B3) inserted through the fastening member insertion portion. It is concluded in.
According to this configuration, the upper end portion of the armrest 20 can be fixed to the support structure 10 by using the fastening member insertion portion that opens upward of the armrest 20. Therefore, it is possible to obtain an armrest 20 that can sufficiently withstand the armrest load by increasing the bonding strength to the support structure 10 around the upper end portion of the armrest 20.

In the chair 1 of the present embodiment, the armrest 20 includes an armrest main body 21 on which the fastening member insertion portion is formed, and a pad 31 attached to the upper surface portion 22a of the armrest main body 21, and the fastening member insertion portion. Is formed in the armrest main body 21, and the opening 25a of the fastening member insertion portion facing upward of the armrest 20 is shielded with the pad 31 as the shielding member.
In this case, an opening 25a of the fastening member insertion portion facing upward of the armrest 20 is formed in the armrest main body 21, and the opening 25a is shielded by the pad 31 of the armrest 20. It is possible to reduce the number of parts and further suppress the influence on the appearance.

In the chair 1 of the present embodiment, the armrest main body 21 has a fixing portion (rear rod 24) fixed to the support structure 10 and an upper surface extending forward from the upper portion of the fixing portion and facing upward of the armrest 20. An elbow rest portion (upper rod 22) forming the portion 22a is provided, and the fastening member insertion portion is provided at the upper portion of the fixing portion and at the rear portion of the elbow rest portion.
In this case, since the rear portion of the elbow rest portion, which is the upper portion of the fixing portion of the armrest main body 21 to the support structure 10, is directly fixed to the support structure 10 by using the fastening member insertion portion, the armrest 20 The upper end portion having the same height as the armrest portion is fixed to the support structure 10. Therefore, the bond strength with respect to the elbow rest load can be effectively increased. That is, when an elbow resting load is applied to the elbow resting portion extending forward from the upper part of the fixing portion, a moment in the direction of pulling away from the support structure 10 acts on the upper part of the fixing portion and the rear part of the elbow resting portion, but the upper part of the fixing portion. Moreover, by fastening the rear portion of the elbow rest portion to the support structure 10, a force that opposes the moment can be effectively obtained.

In the chair 1 of the present embodiment, the fixing portion includes a second fastening portion (nut hole 24b) to be fastened to the support structure 10 below the fastening member insertion portion.
In this case, since the fixing portion of the armrest main body 21 is fastened to the support structure 10 not only at the upper part but also at the lower part, the armrest main body 21 can be stably fixed to the support structure 10.

In the chair 1 of the present embodiment, the support structure 10 includes a backrest 5, and the armrest 20 is fixed to the backrest 5.
In this case, since the upper end portion of the armrest 20 is fixed to the backrest 5 by using the fastening member insertion portion that opens upward of the armrest 20, the coupling strength of the armrest 20 with respect to the armrest load can be increased. .. In particular, since the backrest 5 is separated from the elbow resting position to the rear, the moment acting on the joint portion of the armrest 20 becomes large, and a force that opposes this moment can be effectively obtained.

In the chair 1 of the present embodiment, the fastening member insertion portion extends from the opening 25a facing upward of the armrest 20 so as to be located inward in the chair width direction toward the lower side, and the fastening member insertion portion is inserted. The armrest 20 is fastened to the support structure 10 by the fastening member along the portion.
In this case, not only the armrest 20 and the support structure 10 can be fastened in the vertical direction, but also the armrest 20 and the support structure 10 can be fastened in the chair width direction by a fastening member along the inclination of the fastening member insertion portion. This makes it possible to increase the degree of freedom in setting the connecting structure of the armrest 20.

The present invention is not limited to the above embodiment. For example, the portion of the support structure that supports the armrest is not limited to the backrest, and may be a backrest support rod, a seat, a support base, or the like. .. The armrest is not limited to the configuration in which the opening of the bolt insertion hole is shielded by a pad, and may be provided with a dedicated shielding member. The first bolt is not limited to the configuration in which it is arranged so as to be inclined when viewed from the front-rear direction, and may be arranged so as to be inclined when viewed from the left-right direction, or may be arranged so as to be arranged along the vertical direction without inclination.
The configuration in the above embodiment is an example of the present invention, and various modifications can be made without departing from the gist of the present invention.

1 Chair 5 Backrest 10 Support structure 20 Armrest 21 Armrest body 22 Upper rod (elbow rest)
22a Top surface 24 Rear rod (fixed part)
24b nut hole (second fastening part)
25 Bolt insertion hole (fastening member insertion part)
25a Aperture B3 1st bolt (fastening member)

Claims (4)

In a chair in which an armrest is fixed to a support structure by a fastening member
Comprising a fastening member insertion portion for opening at a site facing upward in the armrest, the said fastening member is inserted into the fastening member insertion portion, an shall the armrest is fastened to the support structure,
The armrest includes an armrest body on which the fastening member insertion portion is formed, and a pad attached to an upper surface portion of the armrest body.
The armrest body includes a fixing portion fixed to the support structure and an elbow rest portion extending forward from the upper portion of the fixing portion and forming an upper surface portion facing upward of the armrest. A chair characterized in that the fastening member insertion portion is provided at the rear portion of the armrest portion at the upper portion. The chair according to claim 1 , wherein the fixing portion includes a second fastening portion to be fastened to the support structure below the fastening member insertion portion. In a chair in which an armrest is fixed to a support structure by a fastening member
The armrest is fastened to the support structure by the fastening member inserted into the fastening member insertion portion and provided with a fastening member insertion portion that opens at a portion of the armrest facing upward.
It said supporting structure comprises a backrest, chair the armrest to the backrest, characterized in that it is fixed. In a chair in which an armrest is fixed to a support structure by a fastening member
The armrest is fastened to the support structure by the fastening member inserted into the fastening member insertion portion and provided with a fastening member insertion portion that opens at a portion of the armrest facing upward.
The fastening member insertion portion extends from an opening facing upward of the armrest so as to be located inward in the chair width direction toward the lower side, and the fastening member along the fastening member insertion portion extends the fastening member insertion portion. There chair, characterized in that it is fastened to the support structure.

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