JP7752011B2 - chair - Google Patents

Description

The present invention relates to a chair.

Patent Document 1 below discloses a chair that has armrest mounting sections (armrest mounting sections) for attaching armrests to opposing left and right sides of a seat support (seat support member) that supports the seat (seat body). The armrest mounting sections have a recess, and the armrest has a protrusion that can be inserted and removed from the recess. The armrest is fixed to the armrest mounting sections with bolt members, with the recess and protrusion engaged.

Japanese Patent Application Laid-Open No. 4726338

The above chair has the advantage that the armrest attachment parts are provided on the seat support member, which is a strength member, allowing the armrests to be firmly fixed. However, the upper part of the armrest attachment part provided on the seat support member is covered by the seat body, and the armrest attachment part, which is a strength member, abuts the underside of the seat body, preventing the seat body from flexibly deforming in response to the seating load. Furthermore, when a seating load is input to the seat body, the occupant may feel the armrest attachment parts and the shape of the armrest through the seat body, which could cause them to feel uncomfortable.

The present invention was made in consideration of the above circumstances, and aims to provide a chair that can ensure the flexibility of the seat body located above, even when armrests are attached to the seat support member.

In order to solve the above problems, the present invention employs the following aspects.
A chair according to one aspect of the present invention comprises a support structure including legs and bases installed at the upper ends of the legs, a seat support member supported by the support structure and having armrest mounting portions, armrests attached to the armrest mounting portions, and a seat body supported by the seat support member and covering the upper part of the armrest mounting portions, and a vertical space is formed between the seat body and the armrest mounting portions to allow downward displacement of the seat body.

In this aspect, the armrest attachment parts are provided on the seat support member, which is a strength member that supports the seat body, allowing the armrests to be firmly fixed, resulting in a robust structure. Furthermore, by fixing the armrests to the seat support member, the seat body can be made thin and flexible, providing flexibility that gives the seated person a comfortable fit. Here, a vertical space is formed between the armrest attachment parts extending to the left and right of the seat support member and the seat body that covers the armrest attachment parts, allowing for downward displacement of the seat body. Therefore, the armrest attachment parts do not impede the flexibility of the seat body, and the seated person does not feel the hardness of the armrest attachment parts.

In the chair according to the above aspect, the armrest attachment portion may be located outward of the support base of the support structure when viewed from above.
According to this aspect, the armrest mounting portion is located outside the support base when viewed from above and below, so the support base does not interfere with the mounting of the armrest.

In the chair according to the above aspect, the armrest attachment portion may extend in the left-right direction of the seat support member.
According to this aspect, the armrest attachment portion can be easily seen from the side, facilitating the armrest attachment work.

In the chair according to the above aspect, the space may expand in the up-down direction as it extends outward in the left-right direction.
According to this aspect, the amount of downward deflection of the seat body increases the further outward in the left-right direction the seat body is moved, so that even for a large occupant or occupant with large buttocks, the seat body can be deflected significantly in the left-right direction to provide a comfortable fit.

In the chair of the above embodiment, the seat support member has a saucer shape that opens at the top in the vertical direction, and the opening is formed up to an armrest mounting portion arranged in the space, and may be provided with a shielding portion that shields the opening in the armrest mounting portion.
According to this aspect, the shielding portion shields the opening of the armrest attachment portion, making the opening invisible from the space between the seat body and the armrest attachment portion, improving the appearance. Also, by arranging the shielding portion above the armrest attachment portion, the armrest attachment portion is covered by the shielding portion, and even if the seat body is displaced significantly downward, the armrest attachment portion will abut against the shielding portion before abutting against the armrest attachment portion, reducing the risk of damage to the seat body.

In the chair of the above aspect, a placement portion for placing the shielding portion may be provided on a peripheral edge of the opening in the armrest attachment portion.
According to this aspect, the shielding portion can be stably placed on the peripheral edge of the opening of the armrest attachment portion.

In one aspect of the chair described above, a cover member may be provided having a through hole formed therein into which the armrest mounting portion is inserted, and the shielding portion may extend in a canopy-like manner from above the through hole in the cover member.
According to this aspect, a through hole is formed into which the armrest mounting portion is inserted, and by extending the shielding portion in a canopy-like manner from the cover member positioned relative to the armrest mounting portion, it becomes easy to position the shielding portion relative to the opening of the armrest mounting portion.

In the chair according to the above aspect, the armrest may be fitted onto the armrest attachment portion extending from the through hole of the cover member.
According to this aspect, the armrest is fitted from the outside with the cover member inserted into the armrest mounting portion, so that the cover member can be fixed to the seat support member without any fixing parts for the cover member, thereby improving assembly ease.

The above aspects provide a chair that ensures flexibility of the seat body located above, even when armrests are attached to the seat support member.

1 is a perspective view of a chair according to an embodiment, viewed from the front side. FIG. 1 is a perspective view of a chair according to an embodiment, viewed from the rear side. FIG. FIG. 2 is a plan view of an armrest mounting structure according to one embodiment. 4 is a plan view of the armrest mounting structure shown in FIG. 3 with the cover member removed. FIG. 4 is a cross-sectional view taken along the line VV in FIG. 3. FIG. 2 is a perspective view of a seat receiving member according to one embodiment, as viewed from the top side. FIG. 2 is an exploded perspective view of a seat receiving member according to one embodiment, as viewed from the top side. FIG. 2 is a right side view of the seat receiving member according to the embodiment. FIG. 2 is a perspective view of a cover member according to one embodiment, viewed from the bottom side. FIG. 2 is a perspective view of the armrest mounting structure according to one embodiment, viewed from the bottom side. 11 is a cross-sectional view taken along the line XI-XI in FIG.

One embodiment of the present invention will be described below with reference to the drawings. In the following description, the direction indicated by the arrow FR in the figure, which points towards the front of a person seated in a chair in a normal posture, will be referred to as "front," and the opposite direction will be referred to as "rear." Furthermore, with regard to "up," "down," "left," and "right," the direction indicated by the arrow UP in the figure above a person seated in a chair in a normal posture will be referred to as "up," and the opposite direction will be referred to as "down," and the direction indicated by the arrow LH in the figure to the left of a person seated in a chair in a normal posture will be referred to as "left," and the opposite direction will be referred to as "right."

Fig. 1 is a perspective view of a chair 1 according to an embodiment as viewed from the front side. Fig. 2 is a perspective view of the chair 1 according to an embodiment as viewed from the back side.
As shown in these figures, the chair 1 of this embodiment comprises legs 2 placed on the floor, a box-shaped support base 3 installed at the upper ends of the legs 2, a seat body 4 on which an occupant sits, a seat support member 5 attached to the upper surface of the support base 3 and supporting the seat body 4, a backrest 6 that supports the back of the occupant seated on the seat body 4, a backrest support member 7 that supports the backrest 6 from behind, and armrests 8 that support the elbows of the occupant seated on the seat body 4. The legs 2 and the support base 3 form a support structure that supports the seat support member 5.

The leg section 2 comprises a multi-pronged leg 11 with casters 2a, and a base 12 that rises from the center of the multi-pronged leg 11 and incorporates a gas spring as a lifting mechanism. A support base 3 is attached to the upper end of the base 12 so that it can rotate horizontally. The support base 3 incorporates a lift adjustment mechanism (not shown) for the base 12 and a tilt adjustment mechanism (not shown) for the backrest support member 7.

The seat body 4 comprises a seat body 20 and a seat plate 21 that supports the seat body 20. The seat plate 21 is a resin-molded plate-like member that forms the framework of the seat body 4. While not shown in detail, the seat body 20 also comprises a seat frame (not shown) attached to the outer periphery of the seat plate 21, a cushioning material (not shown) made of urethane or the like that is placed on the upper surface of the seat plate 21, and a seat covering material (not shown) that is stretched over the seat frame and covers the upper side of the cushioning material.

The backrest 6 has a curved shape that is convex backward in plan view and comes into contact with the seated person to bear the weight. The backrest support member 7 is a strength member that supports the backrest 6 from behind at the center in the left-right direction. The backrest support member 7 has a generally L-shape in side view and its front lower end is connected to the tilt adjustment mechanism inside the support base 3.
5, which will be described later, designates a pivot shaft for the backrest support member 7 on the support base 3. Also, designation 13 designates an operating knob for the tilt adjustment mechanism that protrudes from the side surface of the support base 3. Also, designation 14, which is shown in FIGS. 1 and 2, designates a slider that extends the front end of the seat body 4 forward when it is in the folded and stretched state.

The armrest 8 includes an armrest 50 that rests against the elbow of the seated occupant, and an armrest rod 51 that supports the armrest 50. The armrest 50 extends in the front-to-rear direction and is tilted inward in the left-to-right direction. The armrest rod 51 is L-shaped, extending downward from the center of the armrest 50 in the front-to-rear direction and bending inward in the left-to-right direction, and is attached to the seat support member 5 via an outer fitting portion 52.
The mounting structure of the armrest 8 will be described below with reference to FIGS.

Figure 3 is a plan view of the mounting structure for the armrest 8 according to one embodiment. Figure 4 is a plan view of the mounting structure for the armrest 8 with the cover member 9 shown in Figure 3 removed. Figure 5 is a cross-sectional view taken along the arrows V-V in Figure 3. Figure 6 is a perspective view of the seat support member 5 according to one embodiment, viewed from the top. Figure 7 is an exploded perspective view of the seat support member 5 according to one embodiment, viewed from the top. Figure 8 is a right side view of the seat support member 5 according to one embodiment. Figure 9 is a perspective view of the cover member 9 according to one embodiment, viewed from the bottom. Figure 10 is a perspective view of the mounting structure for the armrest 8 according to one embodiment, viewed from the bottom. Figure 11 is a cross-sectional view taken along the arrows XI-XI in Figure 3.

As shown in Figures 6 and 7, the seat support member 5 comprises a main body 30A that is rectangular in plan view, and armrest attachment portions 30B that extend outward in the left-right direction from left-right side portions 30A1 of the main body 30A. The seat support member 5 slides rearward together with the seat body 4 relative to the support base 3 in conjunction with the rearward tilt of the backrest support member 7 relative to the support base 3. The seat support member 5 is a strong member made of a metal material such as drawn sheet metal or aluminum die-cast, and has a saucer shape that is open at the top in the vertical direction. The seat support member 5 may also be molded from injection-molded synthetic resin, in which case it may have a shape other than a saucer shape that is open at the top in the vertical direction.

Specifically, the seat receiving member 5 has a bottom wall portion 31 and a side wall portion 32 that extends upright from the peripheral edge of the bottom wall portion 31. An outwardly extending flange 33 is provided at the upper end of the side wall portion 32. A fixing hole 30B1 is formed in the bottom wall portion 31 of the armrest mounting portion 30B of the seat receiving member 5. A nut member (not shown) is disposed directly above the fixing hole 30B1, allowing the armrest 8 to be screwed in from below. From the perspective of ease of mounting the armrest 8, it is desirable that the armrest mounting portion 30B extend outward beyond the outer lateral edges of the support base 3 in a plan view.

As shown in Figure 4, the armrest 8 has an outer fitting portion 52 that fits onto the armrest mounting portion 30B. The outer fitting portion 52 has a pair of first contact portions 52A that contact the outer surface of the armrest mounting portion 30B from both sides in the front-to-rear direction, and as shown in Figure 10, a second contact portion 52B that contacts the outer surface of the armrest mounting portion 30B from the lower side in the up-down direction.

A communication hole 53 that communicates with the fixing hole 30B1 is formed in the second abutment portion 52B. The area around the communication hole 53 on the underside of the second abutment portion 52B is recessed upward to prevent the fixing screw (not shown) from protruding from the underside of the second abutment portion 52B. The outer fitting portion 52 has a shape in which the lower ends of a pair of first abutment portions 52A are connected in the front-to-rear direction via the second abutment portion 52B.

In other words, the outer fitting portion 52 is U-shaped in the vertical cross section shown in FIG. 11 (a cross section including an axis extending in the front-to-rear direction and an axis extending in the up-down direction). Furthermore, the armrest attachment portion 30B disposed inside the outer fitting portion 52 is also U-shaped in the vertical cross section. Therefore, as shown in FIG. 4, the outer fitting portion 52 and the armrest attachment portion 30B are open on the upper side in the vertical direction. The openings of the outer fitting portion 52 and the armrest attachment portion 30B are shielded by the shielding portion 42 of the cover member 9.

The first abutment portion 52A rotates around the fixed portion with the armrest mounting portion 30B via a bolt (not shown) and abuts against the bottom wall portion 31 of the armrest mounting portion 30B. At this time, the armrest mounting portion 30B itself is bent to form an upward opening, so it can withstand the moment from the first abutment portion 52A. Furthermore, as shown in FIG. 3, a load input to the tip portion 8A of the armrest 8 generates a moment (indicated by the hollow arrow in FIG. 3) that twists the outer fitting portion 52 and the armrest mounting portion 30B together. At this time, the base portion of the armrest mounting portion 30B (indicated by the symbol 30B2) is also bent to form an upward U-shape in cross section, so it can withstand this moment.

As shown in Figure 5, the upper side of the armrest attachment portion 30B is covered by the seat body 4. A vertical space 100 is formed between the seat body 4 and the armrest attachment portion 30B, allowing the seat body 4 to move downward. In this embodiment, the armrest attachment portion 30B extends approximately horizontally in the left-right direction, while the seat body 4 (seat panel 21) is curved upward as it extends outward in the left-right direction. In other words, the space 100 expands vertically as it extends outward in the left-right direction.

The shielding portion 42 shields at least the opening of the armrest mounting portion 30B that extends into the space 100. This shielding portion 42 rests on the flange 33 of the armrest mounting portion 30B. The shielding portion 42 and the upper surface 52a of the outer fitting portion 52 are continuous. In other words, as shown in Figure 4, the armrest mounting portion 30B and its opening cannot be seen from the outside, and the continuous shielding portion 42 and the upper surface 52a of the outer fitting portion 52 maintain a good appearance.

As shown in Figure 7, a cover member 9 is attached to the armrest mounting portion 30B of the seat receiving member 5. The cover member 9 has a cover main body 40 with a through hole 41 formed therein, into which the armrest mounting portion 30B is inserted. The cover main body 40 is formed in the shape of a plate that extends in the front-to-rear direction and is thick in the left-to-right direction. The through hole 41 is formed as an elongated hole that extends in the front-to-rear direction to match the shape of the armrest mounting portion 30B, and a slit-shaped engagement groove 41a that extends in the front-to-rear direction is formed at the upper end of the through hole 41. As shown in Figure 8, the flange 33 of the armrest mounting portion 30B is inserted into the engagement groove 41a.

As shown in FIG. 9, a shielding portion 42 extending outward in the left-right direction like a canopy is provided above the through hole 41 in the cover main body 40. The shielding portion 42 is formed as a plate that extends left-right and has a thickness in the up-down direction. As shown in FIG. 8, the outer shape of the shielding portion 42 is formed slightly larger than the flange 33 of the armrest mounting portion 30B, and the shielding portion 42 rests on the flange 33. In addition, in the plan view shown in FIG. 3, the shielding portion 42 is engaged with a pair of first abutment portions 52A of the outer fitting portion 52. In other words, the shielding portion 42 shields the opening of the upper outer fitting portion 52, of the outer fitting portion 52 and the armrest mounting portion 30B, which open and communicate with each other in the up-down direction. The outer peripheral edge of the shielding portion 42 may be bent downward and shaped to engage with the outer surface of the flange 33 or with both the outer surface and the bottom surface of the flange 33.

As shown in Figure 9, the lower end of the cover body 40 is provided with an insertion portion 43 that extends diagonally inward in the left-right direction. As shown in Figure 5, the lower end of the insertion portion 43 is inserted into the left-right inner side of the cover portion 71 that covers the pivot shaft 15 of the backrest support member 7. In other words, the lower end of the insertion portion 43 is inserted into the gap between the base 3 and the backrest support member 7.

As shown in Figure 9, the cover body 40 has a filling portion 44 extending outward in the left-right direction at the periphery of the through-hole 41, excluding the shielding portion 42. As shown in Figure 5, the filling portion 44 fills the step 101 between the outer surface of the seat support member 5 and the outer fitting portion 52 of the armrest 8 that fits onto the armrest mounting portion 30B, and has a shape that is continuous with the outer surface of the outer fitting portion 52. Note that the inside of the filling portion 44 may be hollowed out as long as the appearance is maintained.

The cover body 40, shielding portion 42, insertion portion 43, and filling portion 44 configured as described above are integrally molded using resin molding. However, some or all of the cover body 40, shielding portion 42, insertion portion 43, and filling portion 44 may be separate parts.

The chair 1 configured as described above provides the following benefits:

The chair 1 according to this embodiment comprises a support structure including legs 2 and bases 3 installed at the upper ends of the legs 2; a seat support member 5 supported by the support structure and having armrest attachment portions 30B; armrests 8 attached to the armrest attachment portions 30B; and a seat body 4 supported by the seat support member 5 and covering the upper part of the armrest attachment portions 30B. As shown in FIG. 5, a vertical space 100 is formed between the seat body 4 and the armrest attachment portions 30B, allowing the seat body 4 to move downward.

With this configuration, the armrest attachment portion 30B is provided on the seat support member 5, which is a strength member that supports the seat body 4, allowing the armrest 8 to be firmly fixed, resulting in a robust structure. Furthermore, by fixing the armrest 8 to the seat support member 5, the seat body 4 (specifically the seat panel 21) can be made thin and flexible, providing flexibility that gives the seated occupant a comfortable fit. Here, a vertical space 100 is formed between the armrest attachment portions 30B extending to the left and right of the seat support member 5 and the seat body 4 that covers the armrest attachment portions 30B, allowing the seat body 4 to move downward. Therefore, the armrest attachment portions 30B do not impede the flexibility of the seat body 4, and the seated occupant does not feel the hardness of the armrest attachment portions 30B.

In addition, in this embodiment, the armrest attachment portion 30B is located further outward than the support base 3 on the support structure when viewed from the top and bottom. With this configuration, the armrest attachment portion 30B is located further outward than the support base 3 when viewed from the top and bottom, so the support base 3 does not interfere with the attachment of the armrest 8.

In addition, in this embodiment, the armrest mounting portion 30B extends in the left-right direction of the seat support member 5. This configuration makes it easier to see the armrest mounting portion 30B from the side, facilitating the installation of the armrest 8.

In addition, in this embodiment, the space 100 expands vertically as it moves outward in the left-right direction. With this configuration, the amount of downward deflection that the seat body 4 can tolerate increases the further outward in the left-right direction the seat body 4 is. Therefore, even for a seated occupant with a large build or large buttocks, for example, the seat body 4 can bend significantly in the left-right direction to provide a comfortable fit.

In addition, in this embodiment, the seat support member 5 has a saucer shape with an opening at the top in the vertical direction, which extends to the armrest mounting portion 30B positioned in the space 100 and is equipped with a shielding portion 42 that shields the opening in the armrest mounting portion 30B. With this configuration, the shielding portion 42 shields the opening in the armrest mounting portion 30B, making the opening invisible from the space 100 between the seat body 4 and the armrest mounting portion 30B, improving the appearance. Furthermore, by locating the shielding portion 42 above the armrest mounting portion 30B, the armrest mounting portion 30B is covered by the shielding portion 42. Even if the seat body 4 is displaced significantly downward, it will abut against the shielding portion 42 before abutting against the armrest mounting portion 30B, thereby reducing the risk of damage to the seat body 4.

In addition, in this embodiment, the peripheral edge of the opening in the armrest attachment portion 30B is provided with a flange 33 (mounting portion) on which the shielding portion 42 is placed. With this configuration, by providing the flange 33 on the peripheral edge of the opening of the seat receiving member 5, the rigidity of the seat receiving member 5 can be increased, and by utilizing the flange 33 on the armrest attachment portion 30B of the seat receiving member 5, the shielding portion 42 can be stably placed.

In addition, this embodiment includes a cover member 9 having a through hole 41 formed therein through which the armrest attachment portion 30B is inserted, and the shielding portion 42 extends in an eave-like manner from the upper part of the through hole 41 in the cover member 9. With this configuration, the through hole 41 through which the armrest attachment portion 30B is inserted is formed, and by having the shielding portion 42 extend in an eave-like manner from the cover member 9 positioned relative to the armrest attachment portion 30B, it becomes easier to position the shielding portion 42 relative to the opening of the armrest attachment portion 30B.

In addition, in this embodiment, the armrest 8 is fitted onto the armrest mounting portion 30B that extends from the through-hole 41 of the cover member 9. With this configuration, the armrest 8 is fitted onto the armrest mounting portion 30B from the outside while the cover member 9 is inserted into it. This allows the cover member 9 to be fixed to the seat support member 5 without the need for fixing parts for the cover member 9, improving assembly ease.

In addition, this embodiment provides the following benefits:

As shown in Figure 5, the chair 1 according to this embodiment comprises a seat body 4 on which an occupant sits, a seat support member 5 that supports the seat body 4 and has an armrest attachment portion 30B extending in the left-right direction, an armrest 8 that has an external fitting portion 52 that fits onto the armrest attachment portion 30B, and a filling portion 44 that fills the step 101 between the outer surface of the armrest attachment portion 30B and the external fitting portion 52.

With this configuration, by fitting the armrest 8 onto the armrest mounting portion 30B of the seat support member 5, the fitting portion 52 of the armrest 8 is made larger than the armrest mounting portion 30B, thereby increasing the strength of the armrest 8 against the armrest load. Meanwhile, the step 101 between the outer surface of the armrest mounting portion 30B and the fitting portion 52, which occurs when the fitting portion 52 of the armrest 8 is made larger than the armrest mounting portion 30B, is filled with the filling portion 44, preventing a deterioration in the external appearance.

In addition, in this embodiment, the outer fitting portion 52 abuts against the outer surface of the armrest mounting portion 30B from both the front and rear sides. With this configuration, even if a moment load is generated in the front and rear direction on the armrest 8 due to the armrest load, the outer fitting portion 52, which is larger than the armrest mounting portion 30B, abuts against the armrest mounting portion 30B from both the front and rear sides, so the moment load can be dispersed and transmitted to the armrest mounting portion 30B, which is a strength member.

In addition, in this embodiment, the outer fitting portion 52 abuts against the outer surface of the armrest mounting portion 30B from both the front-to-rear direction and the bottom side in the up-down direction. With this configuration, even if a moment load is generated on the armrest 8 not only in the front-to-rear direction but also in the left-to-right direction due to the armrest load, the outer fitting portion 52, which is larger than the armrest mounting portion 30B, abuts against the armrest mounting portion 30B from the bottom side in the up-down direction, so the moment load can be dispersed and transmitted to the armrest mounting portion 30B, which is a strength member.

In addition, in this embodiment, the outer fitting portion 52 and the armrest attachment portion 30B have openings that communicate with each other at the upper side in the vertical direction, and include a shielding portion 42 that shields the opening of the outer fitting portion 52 that is located at the top of these openings. With this configuration, of the openings that communicate with each other in the outer fitting portion 52 and the armrest attachment portion 30B, by shielding the opening of the outer fitting portion 52 that is located at the top, the openings of the outer fitting portion 52 and the armrest attachment portion 30B become invisible, thereby improving the external appearance.

In addition, in this embodiment, the upper surface 52a of the shielding portion 42 and the outer fitting portion 52 are continuously connected. With this configuration, the upper surfaces of the shielding portion 42 and the outer fitting portion 52 are continuously connected, improving the appearance.

In addition, in this embodiment, the shielding portion 42 and the filling portion 44 are integrally formed. This configuration reduces the number of parts and allows for efficient assembly to the seat receiving member 5, as the shielding portion 42 and the filling portion 44 are integrally formed.

In this way, according to this embodiment, even when armrests 8 are attached to the seat support member 5, a chair 1 is obtained that can ensure the flexibility of the seat body 4 located above.

The above describes a preferred embodiment of the present invention with reference to the drawings, but the present invention is not limited to the above embodiment. The shapes and combinations of the components shown in the above embodiment are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

For example, in this embodiment, the armrest attachment portion 30B is configured to extend left and right from the seat support member 5. However, if the seat support member 5 is rectangular in plan view, the armrest attachment portion 30B may not extend outward in the left and right direction from the main body portion 30A of the seat support member 5. Even in this case, it is desirable that the armrest attachment portion 30B be located further outward than the support base 3 when viewed from the top and bottom.

REFERENCE SIGNS LIST 1 chair 4 seat body 5 seat support member 8 armrest 9 cover member 30B armrest mounting portion 33 flange 41 through hole 42 shielding portion 44 filling portion 52 outer fitting portion 52a upper surface 100 space

Claims (6)

a support structure including legs and bases installed at the upper ends of the legs;
a seat support member supported by the support structure and having an armrest mounting portion;
an armrest attached to the armrest attachment portion;
a seat body that is supported by the seat receiving member and covers an upper portion of the armrest mounting portion,
A vertical space is formed between the seat body and the armrest attachment portion to allow downward displacement of the seat body,
The seat receiving member has a saucer shape that is open on the upper side in the vertical direction,
The opening is formed to an armrest attachment portion disposed in the space,
a shielding portion that shields the opening in the armrest attachment portion;
a cover member having a through hole into which the armrest attachment portion is inserted,
The shielding portion extends like a canopy from above the through hole in the cover member. The chair of claim 1, further comprising a mounting portion for mounting the shielding portion on the periphery of the opening in the armrest mounting portion. A chair as described in claim 1 or 2, wherein the armrest is fitted onto the armrest mounting portion extending from the through hole of the cover member. a support structure including legs and bases installed at the upper ends of the legs;
a seat support member supported by the support structure and having an armrest mounting portion;
an armrest attached to the armrest attachment portion;
a seat body having a flexible resin seat plate whose left-right central portion is supported by the seat receiving member and which curves upward as it extends outward in the left-right direction to cover the upper portion of the armrest mounting portion and give a comfortable fit to the seat occupant;
A vertical space is formed between the seat body and the armrest attachment portion to allow downward displacement of the seat body ,
The space expands in the vertical direction as it moves outward in the left-right direction,
The seat body is configured so that the outer sides in the left and right directions can be displaced downward, starting from the center in the left and right direction . The chair according to any one of claims 1 to 4 , wherein the armrest attachment portion is positioned outward of the support base in the support structure when viewed from above and below. The chair according to any one of claims 1 to 5 , wherein the armrest attachment portion extends in the left-right direction of the seat support member.