JP2024054990A - Backrest, chair and headrest - Google Patents

Abstract

[Problem] To provide a backrest, chair, and headrest that are kept cleaner. [Solution] The backrest comprises a backrest body and a headrest attached to the backrest body. The headrest comprises a headrest body that is disposed above the backrest body, a skin material that covers the headrest body, and a mounting portion that mounts the headrest body to the backrest body. The mounting portion has a blocking portion that is disposed between the backrest body and the headrest body so as to be sandwiched without any gaps between the upper surface of the backrest body and the skin material. [Selected Figure] Figure 11

Description

The present invention relates to backrests, chairs, and headrests.

For example, Patent Document 1 discloses a chair equipped with a backrest to which a headrest is attached as an optional component. In this chair, the upholstery material on the backrest side and the upholstery material on the headrest side face each other in the vertical direction.

JP 2014-79492 A

However, in the chair disclosed in Patent Document 1, the upholstery material on the backrest side and the upholstery material on the headrest side each tend to capture dust floating in the air. As a result, the dust captured between the upholstery materials may adhere to each other, forming larger particles of dust. Therefore, there is a demand for a configuration that can keep the areas around the backrest and headrest clean.

The present invention was made to solve the above problems, and aims to provide backrests, chairs, and headrests that are kept cleaner.

In order to solve the above problems, the present invention adopts the following aspects.
(1) A backrest in one embodiment of the present invention comprises a backrest body and a headrest attached to the backrest body, the headrest comprising a headrest body arranged above the backrest body, a skin material covering the headrest body, and an attachment portion for attaching the headrest body to the backrest body, the attachment portion having a sealing portion provided between the backrest body and the headrest body and sandwiched without a gap between the upper surface of the backrest body and the skin material.
According to this aspect, dust particles in the air are less likely to flow between the backrest body and the covering material covering the headrest body. As a result, even if dust particles are captured by one or more of the backrest body and the covering material, the captured dust particles are prevented from adsorbing to each other to form large dust particles.

(2) In the backrest relating to the above-mentioned (1) aspect, it is preferable that the upper surface of the backrest main body has a first upper surface facing upward and a pair of second upper surfaces connected to the first upper surface from both left-right sides and curved away from the headrest main body as they proceed in the left-right direction, and that the blocking portion has a first portion extending in the left-right direction along the first upper surface and a pair of second portions connected to the first portion from both left-right sides and extending in the left-right direction along the curvature of the second upper surfaces.
According to this aspect, even if the upper surface of the upper frame rod is curved in the left-right direction, the formation of a gap between the blocking portion and the upper frame rod is suppressed. Therefore, the above-mentioned effect (1) can be achieved even for a backrest body whose upper surface is curved so as to be separated from the headrest body.

(3) In the backrest relating to the above aspect (2), it is preferable that the headrest main body has an insertion hole that opens downward, the mounting portion further has an insertion portion that extends upward from the blocking portion and is inserted into the insertion hole and fixed to the headrest main body, and the headrest main body has a lower edge portion that restrains the upholstery material in a sandwiched state together with the blocking portion when the insertion portion is fixed to the headrest main body.
According to this aspect, the covering portion also serves as a part for restraining the second skin material that covers the headrest body, thereby preventing an increase in the number of parts of the backrest and saving space around the headrest.

(4) In the backrest relating to the above-mentioned (3) aspect, it is preferable that the lower edge portion of the headrest main body has a first lower edge portion extending in the left-right direction along the first upper surface, and a pair of second lower edge portions connected to the first lower edge portion from both sides in the left-right direction and extending in the left-right direction along the curvature of the second upper surface.
According to this aspect, it is possible to prevent the dimension in the vertical direction of the blocking portion located between the second upper surface of the backrest main body and the second lower edge portion of the headrest main body from becoming large.

(5) In a backrest relating to any one of the above aspects (1) to (4), it is preferable that the mounting portion is integrally formed with the blocking portion and further has a fixing portion for fixing the blocking portion to the backrest main body.
According to this aspect, the closing portion is stably positioned relative to the upper frame rod, and an increase in the number of parts of the backrest can be suppressed, compared to a case in which the closing portion and the fixing portion are separate parts, for example.

(6) A chair according to one aspect of the present invention has a backrest according to any one of the above aspects (1) to (5).

(7) A headrest according to one aspect of the present invention is a headrest attached to a backrest body, and includes a headrest body disposed above the backrest body, a skin material covering the headrest body, and an attachment portion for attaching the headrest body to the backrest body, the attachment portion being provided between the backrest body and the headrest body and having a blocking portion sandwiched between the upper surface of the backrest body and the skin material.

The present invention provides a cleaner backrest, chair, and headrest.

1 is a front view of a chair according to an embodiment of the present invention; 1 is a perspective view of a chair according to an embodiment of the present invention, seen from diagonally rear right. 1 is a perspective view showing the internal structure of a backrest body and a headrest provided in a chair according to an embodiment of the present invention; 1A is a perspective view showing the configuration of an upper frame rod of a frame body included in a backrest main body according to an embodiment of the present invention, and FIG. 1A is a perspective view showing a configuration of a mounting portion included in a headrest according to an embodiment of the present invention, and FIG. 2 is a front view of the upper frame rod and the headrest according to the embodiment of the present invention, as viewed from the front. FIG. 1A and 1B are perspective views showing a configuration of an inner shell of a headrest according to an embodiment of the present invention, in which (a) is a perspective view seen from diagonally rear right, and (b) is a perspective view seen from diagonally front left. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. 2 is a front view of an upper frame rod, an attachment portion, and an inner shell according to an embodiment of the present invention, as viewed from the front. FIG. 1A is a perspective view showing a configuration of a cushion material of a headrest according to an embodiment of the present invention, and FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 10. FIG. 11 is a perspective view of a chair according to another embodiment of the present invention, seen from diagonally rear right.

Below, we will explain one embodiment of the backrest of the present invention and a chair equipped with the same, with reference to the attached drawings.

(Embodiment of the chair)
The chair in this embodiment is a piece of furniture that supports a seated person in a seated position, and is used, for example, in offices, stores, etc. As shown in Figures 1 and 2, the chair 1 includes legs 2, a support base 3, a seat 4, and a backrest 5.

For ease of explanation, in the following description, the side seen by a seated person seated in a normal posture on the seat 4 is referred to as the "front side Dsf" (see FIG. 2) in the front-to-back direction Ds of the chair 1, and the opposite side is referred to as the "rear side Dsb" (see FIG. 2) in the front-to-back direction Ds. For example, the front side Dsf seen by the seated person is the front side of the chair 1, and the rear side Dsb seen by the seated person is the rear side of the chair 1. Furthermore, the left side seen by the seated person is referred to as the "left side Dwl" in the left-to-right direction Dw of the chair 1, and the opposite side (right side) is referred to as the "right side Dwr" in the left-to-right direction Dw. Furthermore, the upper side seen by the seated person is referred to as the "upper side Dvu" in the up-to-down direction Dv of the chair 1, and the opposite side is referred to as the "lower side Dvd" in the up-to-down direction Dv.

The legs 2 come into contact with the floor surface F and directly or indirectly support the base 3, seat 4, and backrest 5 from the lower side Dvd. The legs 2 have a multi-pronged leg 2a and a leg post 2b. The multi-pronged leg 2a has a plurality of leg bodies 2a1 extending radially from the center and casters 2a2 provided at the tip of each leg body 2a1. Each caster 2a2 comes into contact with the floor surface F so as to be able to roll.

The leg 2b is provided at the center of the multi-leg 2a so as to rise from the multi-leg 2a to the upper side Dvu. The leg 2b has an outer tube 2b1 and an inner tube 2b2. The outer tube 2b1 is fixed to the multi-leg 2a. The lower part of the inner tube 2b2 is connected to the outer tube 2b1 and is connected to the outer tube 2b1 so as to be movable in the vertical direction Dv. The inner tube 2b2 is supported, for example, by a spring (not shown) housed inside the leg 2b. The upper end of the inner tube 2b2 is fixed to the support base 3. Such a leg 2b supports the seat 4 via the support base 3 so as to be movable in the vertical direction Dv.

The support base 3 is a box-shaped part located on the upper side Dvu of the leg 2. The support base 3 has, inside, for example, a lifting mechanism for the seat 4 (not shown) and a tilting mechanism for the backrest 5 (not shown). The support base 3 is located on the lower side Dvd than the seat 4, and supports the seat 4 from the lower side Dvd. The backrest 5 is connected to the rear of the support base 3. The seat 4 is the part on which the occupant directly sits, and the upper surface facing the upper side Dvu is the seating surface. The chair 1 may also have armrests on which the occupant's elbows and arms are placed. Such armrests are fixed, for example, to the sides of the seat 4.

The backrest 5 is a part that supports the back and head of a seated person from the rear side Dsb. As shown in Figures 1 to 3, the backrest 5 includes a backrest main body 51 and a headrest 52.

The backrest body 51 is a part that mainly supports the back of the seated person from the rear side Dsb. The backrest body 51 has a connection part 510, a frame body 511, and a first skin material 512. As shown in FIG. 2, the connection part 510 is connected to the support base 3 in a state in which the frame body 511 is supported from the lower side Dvd. The connection part 510 is composed of a first connection part 510a that is engaged with the support base 3 and connected so as to be tiltable by the tilting mechanism described above, and a pair of second connection parts 510b that extend to the upper side Dvu in a bifurcated state from the first connection part 510a. Although detailed illustration is omitted, the first connection part 510a has a cylindrical shape with a rectangular opening in the front side Dsf portion toward the front side Dsf, and is accommodated inside while being fitted over at least a part of the tilting mechanism described above. The pair of second connection parts 510b are arranged rearward Dsb from the seat 4 and spaced apart in the left-right direction Dw. Therefore, the entire connection part 510 is held tiltably relative to the support base 3.

The frame body 511 forms the framework of the backrest 5. The frame body 511 is formed, for example, from a synthetic resin material or a metal material. In this embodiment, the frame body 511 has a lower frame rod 511a, an upper frame rod 511b, and a pair of side frame rods 511c.

The lower frame rod 511a connects the upper ends of the pair of second connection parts 510b in the left-right direction Dw. The upper frame rod 511b is disposed on the upper side Dvu of the lower frame rod 511a and extends in the left-right direction Dw. The pair of side frame rods 511c are disposed apart in the left-right direction Dw and connect the lower frame rod 511a and the upper frame rod 511b in the up-down direction Dv. Specifically, the side frame rod 511c disposed on the right side Dwr of the pair of side frame rods 511c extends in the up-down direction Dv and connects the right side Dwr part of the lower frame rod 511a and the right side Dwr part of the upper frame rod 511b in the up-down direction Dv. On the other hand, the side frame rod 511c arranged on the left side Dwl of the pair of side frame rods 511c extends in the vertical direction Dv and connects the left side Dwl portion of the lower frame rod 511a and the left side Dwl portion of the upper frame rod 511b in the vertical direction Dv.

In this embodiment, the lower frame rod 511a, the upper frame rod 511b, and the pair of side frame rods 511c form a frame opening 51h in the frame body 511.

The first skin material 512 is provided on the frame body 511 so as to cover the frame opening 51h of the frame body 511 from the front side Dsf. The first skin material 512 is fixed to the frame body 511, for example, by being fixed (tacking) inside the grooves 51g formed in each of the lower frame rod 511a, the upper frame rod 511b, and the side frame rod 511c. The first skin material 512 is formed, for example, from a cloth material or a leather material. The first skin material 512 may also be formed from an upholstery material such as mesh.

The headrest 52 is a part that mainly supports the head of the seated occupant from the rear side Dsb. The headrest 52 is attached to the backrest main body 51. The headrest 52 includes a headrest main body 521, a second skin material 522 (skin material), and an attachment portion 523.

As shown in FIG. 3, the headrest body 521 is composed of multiple members. For convenience, the second skin material 522 is not shown in FIG. 3. The headrest body 521 is attached to the frame body 511 by the attachment portion 523. The headrest body 521 is disposed on the upper side Dvu of the frame body 511.

The following describes the configuration of the mounting portion 523 and the headrest body 521, as well as how the headrest body 521 is attached to the frame body 511 by the mounting portion 523, with reference to Figure 4 and subsequent drawings.

First, the upper frame rod 511b of the frame body 511 described above will be described. As shown in FIG. 4, the upper frame rod 511b has a first upper surface 511e facing the upper side Dvu, and a pair of second upper surfaces 511f connected to the first upper surface 511e from both sides in the left-right direction Dw and curved to face the left-right direction Dw as it approaches the left-right direction Dw. In this embodiment, the first upper surface 511e and the second upper surface 511f form the upper surface 511d of the upper frame rod 511b. The second upper surface 511f curves to move away from the headrest main body 521 as it approaches the left-right direction Dw. In addition, the second upper surface 511f is smoothly connected to the first upper surface 511e and each of the side surfaces 511s facing the left-right direction Dw of the side frame rod 511c.

The upper frame rod 511b also has a storage recess 511g that is recessed from the surface facing the rear side Dsb toward the front side Dsf. The storage recess 511g extends in the left-right direction Dw. The upper frame rod 511b also has a connection hole 511h that is recessed from the surface facing the rear side Dsb toward the front side Dsf on the inner surface of the storage recess 511g. A fastener 523n such as a bolt can be connected to the connection hole 511h. In this embodiment, the two connection holes 511h are arranged spaced apart in the left-right direction Dw. The groove 51g formed in the upper frame rod 511b also extends in the left-right direction Dw along the first upper surface 511e and the second upper surface 511f on the upper side Dvu of the storage recess 511g.

Next, the mounting portion 523 will be described. The mounting portion 523 is formed, for example, from a synthetic resin material. The mounting portion 523 may also be formed from a metal material. As shown in Figures 5 and 6, the mounting portion 523 has a blocking portion 523a, an insertion portion 523b, and a fixing portion 523c.

The blocking portion 523a is placed on the upper surface 511d of the upper frame rod 511b via the first skin material 512 (not shown). The blocking portion 523a has a first portion 520a extending in the left-right direction Dw along the first upper surface 511e of the upper frame rod 511b, and a pair of second portions 520b connected to the first portion 520a from both sides in the left-right direction Dw and extending in the left-right direction Dw along the curve of the second upper surface 511f of the upper frame rod 511b. The dimensions of the first portion 520a and the second portion 520b in the front-to-rear direction Ds are the same as the dimensions of the upper frame rod 511b in the front-to-rear direction Ds.

As shown in FIG. 6, the first portion 520a has a first surface 520a1 facing the upper side Dvu, and a second surface 520a2 facing the opposite side (lower side Dvd) from the first surface 520a1. The first surface 520a1 and the second surface 520a2 are formed smoothly. The second surface 520a2 is arranged parallel to the first upper surface 511e of the upper frame rod 511b. The second surface 520a2 faces the first upper surface 511e from the upper side Dvu with the first skin material 512 sandwiched therebetween. The first skin material 512 is arranged without any gaps between the second surface 520a2 and the first upper surface 511e.

The first portion 520a is also formed with a raised portion 520p for gathering and clamping the second skin material 522 of the headrest 52 together with a tucking portion 521p of the inner shell 521a described below. The raised portion 520p protrudes from the first surface 520a1 of the first portion 520a. In this embodiment, two raised portions 520p are arranged on the first portion 520a, spaced apart in the left-right direction Dw.

Each of the pair of second parts 520b has a first curved surface 520b1 that is connected to the first part 520a from the left-right direction Dw and curves along the curvature of the second upper surface 511f of the upper frame rod 511b, and a second curved surface 520b2 that is curved along the second upper surface 511f on the opposite side to the first curved surface 520b1. The second curved surface 520b2 is smoothly connected to the second surface 520a2 of the first part 520a from the left-right direction Dw. The second curved surface 520b2 faces the second upper surface 511f of the upper frame rod 511b from the upper side Dvu with the first skin material 512 sandwiched between them. The first skin material 512 is arranged without a gap between the second curved surface 520b2 and the second upper surface 511f. Therefore, the first skin material 512 forms the upper surface of the backrest main body 51.

The insertion portion 523b is a portion that extends from the first surface 520a1 of the first portion 520a toward the upper side Dvu. As shown in FIG. 3, the insertion portion 523b is a portion that is inserted into the headrest main body 521 and fixed to the headrest main body 521. As shown in FIG. 5, the insertion portion 523b in this embodiment is formed integrally with the blocking portion 523a. The insertion portion 523b is disposed between two raised portions 520p formed on the first portion 520a. The insertion portion 523b is also disposed in the center of the first surface 520a1 of the first portion 520a.

As shown in FIG. 6, the insertion portion 523b has a rectangular shape when viewed from the front side Dsf. Also, as shown in FIG. 5, the insertion portion 523b is formed so that the width dimension in the front-rear direction Ds gradually decreases toward the upper side Dvu. The insertion portion 523b has an engagement claw portion 523i that can engage with the headrest main body 521. The engagement claw portion 523i is located in the center of the insertion portion 523b.

The fixing portion 523c is a portion that fixes the blocking portion 523a to the upper frame rod 511b of the frame body 511. The fixing portion 523c is formed integrally with the first portion 520a of the blocking portion 523a. The fixing portion 523c is arranged so as to cover the storage recess 511g formed in the upper frame rod 511b from the rear side Dsb. In this embodiment, the fixing portion 523c has a fixing portion main body 523m, a coupling 523n, and a cover 523o.

The fixing part main body 523m expands from the rear side Dsb of the first part 520a toward the lower side Dvd, and is disposed adjacent to the upper frame rod 511b in the front-rear direction Ds. The fixing part main body 523m is formed with a cover accommodating part 523g that is recessed from the surface facing the rear side Dsb toward the front side Dsf. This cover accommodating part 523g is fitted into the accommodating recess 511g formed in the upper frame rod 511b. Furthermore, as shown in FIG. 3, an insertion hole 523h is formed on the inner surface of the cover accommodating part 523g from the surface facing the rear side Dsb toward the front side Dsf, penetrating the fixing part main body 523m. In this embodiment, the two insertion holes 523h are disposed apart in the left-right direction Dw. These two insertion holes 523h are disposed so as to overlap in the front-rear direction Ds with the coupling hole 511h formed in the accommodating recess 511g of the upper frame rod 511b.

As shown in Figures 3 and 5, the fastener 523n is a bolt that is screwed into the insertion hole 523h formed in the cover accommodating portion 523g of the fixing portion main body 523m and the fastener hole 511h formed in the accommodating recess 511g of the upper frame rod 511b. That is, the fastener 523n fastens the blocking portion 523a to the upper frame rod 511b by connecting the fixing portion main body 523m and the upper frame rod 511b. In other words, by fixing the fixing portion main body 523m to the upper frame rod 511b by the fastener 523n, the blocking portion 523a is positioned immovably in a state in which it is placed on the upper surface 511d via the first skin material 512. The head of the fastener 523n is accommodated in the cover accommodating portion 523g.

The cover 523o is arranged to fit into the cover accommodating portion 523g formed in the fixed part main body 523m (see FIG. 7). Specifically, as shown in FIG. 5, the cover 523o fits into the cover accommodating portion 523g by engaging the engagement claw portion of the cover 523o with the engagement recess disposed in the accommodating recess 511g. By fitting into the accommodating recess 511g, the cover 523o shields the inner surface of the accommodating recess 511g and the fastener 523n so that they cannot be seen from the outside. The surface of the cover 523o facing the rear side Dsb is flush with the surface of the fixed part main body 523m facing the rear side Dsb when the cover 523o fits into the accommodating recess 511g (see FIG. 7).

Next, the headrest main body 521 will be described.
3, the headrest body 521 has an inner shell 521a and a cushion material 521b. The configuration of the inner shell 521a will be described below with reference to Figs. 7 to 9, and the configuration of the cushion material 521b will be described with reference to Figs. 10 and 11.

As shown in FIG. 7, the inner shell 521a is a member provided on the mounting portion 523 from the upper side Dvu. The inner shell 521a is formed of, for example, a synthetic resin material. The inner shell 521a may be formed of a metal material or the like. The inner shell 521a spreads in a plate shape in the left-right direction Dw. The inner shell 521a has an insertion hole 521h into which the insertion portion 523b of the mounting portion 523 is inserted from the lower side Dvd. The insertion hole 521h opens toward the lower side Dvd. As shown in FIG. 8, an engagement portion 521j is formed inside the insertion hole 521h with which the engagement claw portion 523i of the insertion portion 523b can engage. Specifically, when the insertion portion 523b is inserted into the insertion hole 521h, the surface of the engagement claw portion 523i facing the downward side Dvd abuts against the surface of the engagement portion 521j facing the upward side Dvu, making it difficult for the entire inner shell 521a to displace upward to the upward side Dvu. In other words, the insertion portion 523b of the attachment portion 523 is inserted into the insertion hole 521h of the inner shell 521a and fixed to the headrest main body 521.

8 and 9, the inner shell 521a has a lower edge 521d that restrains the second skin material 522 in a sandwiched state together with the blocking portion 523a when the insertion portion 523b is fixed to the inner shell 521a. As shown in FIG. 8, the inner shell 521a in this embodiment has a pair of lower edge portions 521d aligned in the front-rear direction Ds in a state in which the inner shell 521a extends in the left-right direction Dw. The lower edge portion 521d has a convex curved surface shape that is convex toward the lower side Dvd. The insertion hole 521h is disposed between the pair of lower edge portions 521d aligned in the front-rear direction Ds. Specifically, the lower edge portion 521d restrains the second skin material 522 covering the headrest main body 521 in a sandwiched state in the up-down direction Dv together with the first surface 520a1 and the first curved surface 520b1 of the blocking portion 523a. The second skin material 522 in this embodiment is formed of, for example, a cloth material or a leather material. The second skin material 522 may be made of a stretch material such as mesh. For convenience, the second skin material 522 is not shown in Figures 7 and 9.

7 and 9, the inner shell 521a has tack parts 521p arranged one by one to correspond to the raised parts 520p formed in the blocking part 523a. That is, the two tack parts 521p are arranged at a distance in the left-right direction Dw with the insertion hole 521h sandwiched between them. The tack part 521p has a cylindrical shape with one end arranged on the upper side Dvu closed, and opens on the lower side Dvd toward the raised part 520p. The tack part 521p houses a cylindrical pressing member (not shown) extending in the up-down direction Dv. The pressing member presses the raised part 520p to the lower side Dvd while abutting against the raised part 520p from the upper side Dvu via the second skin material 522. In other words, the tucking portion 521p clamps the second skin material 522 while pressing the raised portion 520p downward Dvd.

As shown in FIG. 10, the cushion material 521b is placed on the upper surface 511d of the blocking portion 523a and is arranged to surround the inner shell 521a. In other words, the cushion material 521b houses the inner shell 521a. In this embodiment, the inner shell 521a is formed of a material such as urethane. As shown in FIG. 11, the inner shell 521a has a convex curved surface that is convex toward the front side Dsf. The convex curved surface of the inner shell 521a protrudes toward the front side Dsf beyond the upper frame rod 511b. The cushion material 521b is also covered by the second skin material 522. The second skin material 522 is provided so as to cover the cushion material 521b from the upper side Dvu, covering the entire cushion material 521b, and is sandwiched without any gaps between the lower edge portion 521d of the inner shell 521a and the first surface 520a1 and first curved surface 520b1 of the blocking portion 523a (tacking).

With the configuration described above, the blocking portion 523a is positioned between the backrest body 51 and the headrest body 521 so as to be sandwiched without any gaps between the first skin material 512 and the second skin material 522 provided on the upper surface 511d (first upper surface 511e and second upper surface 511f) of the upper frame rod 511b of the backrest body 51.

This embodiment provides the following effects:

In this embodiment, the blocking portion 523a of the mounting portion 523 is disposed without any gaps between the backrest body 51 and the second skin material 522 that covers the headrest body 521, so that dust in the air is less likely to flow between the backrest body 51 and the headrest body 521. As a result, even if dust is captured by one or more of the second skin materials 522 that cover the backrest body 51 and the headrest body 521, the blocking portion 523a blocks the gap between the backrest body 51 and the second skin material 522, so that the captured dust particles are prevented from adsorbing each other to form larger dust particles. Therefore, the backrest 5 can be kept clean.

In addition, in this embodiment, the second portion 520b of the blocking portion 523a extends in the left-right direction Dw so as to follow the curvature of the second upper surface 511f of the upper frame rod 511b. Therefore, even if the upper surface 511d of the upper frame rod 511b in the left-right direction Dw is curved, the formation of a gap between the blocking portion 523a and the upper frame rod 511b is suppressed. In other words, even if the upper surface 511d of the backrest main body 51 is curved so as to move away from the headrest main body 521, a gap is unlikely to form between the backrest main body 51 and the blocking portion 523a, and dust is prevented from accumulating between the backrest main body 51 and the blocking portion 523a.

In addition, in this embodiment, the blocking portion 523a also serves as part of the component for restraining the second skin material 522 that covers the headrest body 521. This prevents an increase in the number of components in the backrest 5 and saves space around the headrest 52.

In addition, in this embodiment, the second lower edge 521f of the inner shell 521a extends in the left-right direction Dw so as to follow the curvature of the second upper surface 511f of the upper frame rod 511b. This prevents the dimension of the blocking portion 523a located between the second upper surface 511f of the backrest main body 51 and the second lower edge 521f of the headrest main body 521 from becoming large in the up-down direction Dv. As a result, the headrest main body 521 can have a larger area.

In addition, since the fixing portion 523c that fixes the blocking portion 523a to the upper frame rod 511b is formed integrally with the blocking portion 523a, the blocking portion 523a is stably positioned relative to the upper frame rod 511b. As a result, the displacement of the blocking portion 523a when an external force is applied to the mounting portion 523 is suppressed. In addition, compared to when the blocking portion 523a and the fixing portion 523c are separate parts, for example, the increase in the number of parts of the backrest 5 can be suppressed. Therefore, the backrest 5 can be easily assembled.

Although the embodiments of the present disclosure have been described above in detail with reference to the drawings, the specific configuration is not limited to the configuration of the embodiment, and additions, omissions, substitutions, and other modifications of the configuration are possible without departing from the spirit of the present disclosure.

12, the first skin material 512 is not limited to a configuration in which it covers the frame body 511 from the front side Dsf as described in the above embodiment, but may be provided on the frame body 511 so as to cover the frame body 511 from the rear side Dsb as well. In this case, the frame body 511 may further have a shell (not shown) provided on each frame rod (lower frame rod 511a, upper frame rod 511b, side frame rod 511c) so as to close the frame opening 51h (not shown). In this case, a cushioning material may be disposed between the frame body 511 and the shell and the first skin material 512.

1...chair 2...leg 2a...multi-leg 2a1...leg body 2a2...caster 2b...leg pillar 2b1...outer tube 2b2...inner tube 3...support 4...seat 5...backrest 51...backrest body 51g...groove 51h...frame opening 52...headrest 510...connection 510a...first connection 510b...second connection 511...frame body 511a...lower frame rod 511b...upper frame rod 511c...side frame rod 511d...top surface 511e...first top surface 511f...second top surface 511g...receiving recess 511h...connection hole 511s...side surface 512...first skin 520a...first portion 520a1...first surface 520a2...second surface 520b...second portion 520b1...first curved surface 520b2...second curved surface 520p...raised portion 521...headrest main body 521a...inner shell 521b...cushion material 521d...lower edge portion 521e...first lower edge portion 521f...second lower edge portion 521h...insertion hole 521j...engagement portion 521p...tacking portion 522...second skin material 523...attachment portion 523a...closing portion 523b...insertion portion 523i...engagement claw portion 523c...fixing portion 523g...cover accommodating portion 523h...insertion hole 523m...fixing portion main body 523n...connector 523o...cover Ds...front-rear direction Dsb...rear side Dsf...front side Dv...up-down direction Dvd...lower side Dvu...upper side Dw...left-right direction Dwl...left side Dwr...right side F...floor surface

Claims (7)

A backrest comprising a backrest body and a headrest attached to the backrest body,
The headrest is
A headrest body disposed above the backrest body;
A skin material covering the headrest body;
and a mounting portion for mounting the headrest body to the backrest body.
The mounting portion is
The backrest has a closing portion provided between the backrest body and the headrest body, and sandwiched without any gap between an upper surface of the backrest body and the covering material. The upper surface of the backrest body is
a first top surface facing upward;
a pair of second upper surfaces connected to the first upper surface from both sides in the left-right direction and curved so as to move away from the headrest body in the left-right direction;
The blocking portion is
a first portion extending in the left-right direction along the first upper surface;
The backrest according to claim 1 , further comprising: a pair of second portions connected to the first portion from both sides in the left-right direction and extending in the left-right direction along the curve of the second upper surface. The headrest body has an insertion hole that opens downward,
The mounting portion is
The headrest further includes an insertion portion extending upward from the blocking portion and inserted into the insertion hole to be fixed to the headrest body,
The headrest body is
The backrest according to claim 2 , further comprising a lower edge portion that sandwiches and restrains the covering material together with the closing portion when the insertion portion is fixed to the headrest body. The lower edge portion of the headrest body is
a first lower edge portion extending in the left-right direction along the first upper surface;
The backrest according to claim 3 , further comprising: a pair of second lower edge portions connected to the first lower edge portion from both sides in the left-right direction and extending in the left-right direction along the curve of the second upper surface. The mounting portion is
The backrest according to claim 1 , further comprising a fixing portion that is integrally formed with the blocking portion and fixes the blocking portion to the backrest body. A chair comprising the backrest according to any one of claims 1 to 4. A headrest attached to a backrest body,
A headrest body disposed above the backrest body;
A skin material covering the headrest body;
and a mounting portion for mounting the headrest body to the backrest body.
The mounting portion is
The headrest has a blocking portion provided between the backrest body and the headrest body, and sandwiched without any gap between the upper surface of the backrest body and the covering material.

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