Backrests, chairs, and headrests

Abstract

To provide a backrest, a chair, and a headrest that are kept cleaner.SOLUTION: A backrest includes a backrest body and a headrest attached to the backrest body. The headrest includes a headrest body arranged above the backrest body, a skin material covering the headrest body, and an attachment unit for attaching the headrest body to the backrest body. The attachment unit has a closing part arranged between the backrest body and the headrest body so as to be sandwiched between the upper surface of the backrest body and the skin material without a gap.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to a backrest, a chair, and a headrest.

Background Art

[0002] For example, Patent Document 1 discloses a chair provided with a backrest to which a headrest is attached as an optional member. In this chair, the stretching material on the backrest side and the stretching material on the headrest side face each other in the vertical direction.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the chair disclosed in Patent Document 1 above, each of the stretching material on the backrest side and the stretching material on the headrest side may capture dust floating in the air. Therefore, dust captured between the stretching materials may adsorb to each other to form larger dust. Therefore, a configuration that can keep the surroundings of the backrest and the headrest clean is required.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a backrest, a chair, and a headrest that are kept cleaner.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention has adopted the following aspects. (1) A backrest according to one aspect of the present invention comprises a backrest body and a headrest attached to the backrest body, wherein the headrest comprises a headrest body positioned above the backrest body, a surface material covering the headrest body, and a mounting portion for attaching the headrest body to the backrest body, the mounting portion having a closing portion provided between the backrest body and the headrest body and sandwiched without gap between the upper surface of the backrest body and the surface material. According to this embodiment, dust from the air is less likely to flow between the backrest body and the surface material covering the headrest body. As a result, even if dust is captured by one or more of the backrest body and / or surface material, it is prevented that the captured dust particles will adhere to each other and form larger dust particles.

[0007] (2) In the backrest according to the embodiment of (1) above, the upper surface of the backrest body preferably has a first upper surface facing upward and a pair of second upper surfaces connected to the first upper surface from both sides in the left-right direction and curving so as to move away from the headrest body in the left-right direction, and the closing portion preferably 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 sides in the left-right direction and extending in the left-right direction along the curvature of the second upper surface. According to this embodiment, even if the upper surface of the upper frame rod is curved in the left-right direction, the formation of a gap between the sealing portion and the upper frame rod is suppressed. Therefore, the effect of (1) above can be achieved even for a backrest body whose upper surface is curved so as to be separated from the headrest body.

[0008] (3) In the backrest according to the embodiment of (2) above, the headrest 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 body, and the headrest body preferably has a lower edge portion that, when the insertion portion is fixed to the headrest body, restrains the surface material together with the blocking portion. According to this embodiment, the sealing portion also serves as part of the component for restraining the second surface material that covers the headrest body. Therefore, it is possible to suppress an increase in the number of parts of the backrest and to save space around the headrest.

[0009] (4) In the backrest according to the embodiment of (3) above, it is preferable that the lower edge of the headrest body has a first lower edge extending in the left-right direction along the first upper surface, and a pair of second lower edges connected to the first lower edge 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 embodiment, it is possible to suppress an increase in the vertical dimension of the blocking portion located between the second upper surface of the backrest body and the second lower edge of the headrest body.

[0010] (5) In a backrest according to any of the embodiments of (1) to (4) above, it is preferable that the mounting portion is integrally formed with the closing portion and further has a fixing portion for fixing the closing portion to the backrest body. According to this embodiment, the sealing portion is stably positioned relative to the upper frame rod. Furthermore, compared to, for example, the case where the sealing portion and the fixing portion are separate parts, the increase in the number of parts of the backrest can be suppressed.

[0011] (6) A chair according to one aspect of the present invention is equipped with a backrest according to any of the above aspects (1) to (5).

[0012] (7) A headrest according to one aspect of the present invention is a headrest attached to a backrest body, comprising a headrest body positioned above the backrest body, a surface material covering the headrest body, and a mounting portion for attaching the headrest body to the backrest body, wherein the mounting portion is provided between the backrest body and the headrest body and has a closing portion sandwiched between the upper surface of the backrest body and the surface material. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a backrest, a chair, and a headrest that are kept cleaner.

Brief Description of the Drawings

[0014] [Figure 1] It is a front view of the chair according to an embodiment of the present invention as seen from the front. [Figure 2] It is a perspective view of the chair according to an embodiment of the present invention as seen from the right rear diagonally. [Figure 3] It is a perspective view showing the internal structure of the backrest main body and the headrest provided in the chair according to an embodiment of the present invention. [Figure 4] It is a perspective view showing the configuration of the upper frame rod of the frame provided in the backrest main body according to an embodiment of the present invention. (a) is a perspective view seen from the right rear diagonally, and (b) is a perspective view seen from the left front diagonally. [Figure 5] It is a perspective view showing the configuration of the attachment part provided in the headrest according to an embodiment of the present invention. (a) is a perspective view seen from the right rear diagonally, and (b) is a perspective view seen from the left front diagonally. [Figure 6] It is a front view of the upper frame rod and the headrest according to an embodiment of the present invention as seen from the front. [Figure 7] It is a perspective view showing the configuration of the inner shell of the headrest according to an embodiment of the present invention. (a) is a perspective view seen from the right rear diagonally, and (b) is a perspective view seen from the left front diagonally. [Figure 8] It is a cross-sectional view in the direction of the VIII-VIII line shown in FIG. 7. [Figure 9] It is a front view of the upper frame rod, the attachment part, and the inner shell according to an embodiment of the present invention as seen from the front. [Figure 10] It is a perspective view showing the configuration of the cushion material of the headrest according to an embodiment of the present invention. (a) is a perspective view seen from the right rear diagonally, and (b) is a perspective view seen from the left front diagonally. [Figure 11] It is a cross-sectional view in the direction of the XI-XI line shown in FIG. 10. [Figure 12]It is a perspective view of a chair according to another embodiment of the present invention, seen from the rear right obliquely.

Mode for Carrying Out the Invention

[0015] Hereinafter, with reference to the accompanying drawings, an embodiment of a backrest according to the present invention and a chair provided with the same will be described.

[0016] (Embodiment of Chair) The chair in this embodiment is a furniture that supports a seated person in a sitting posture and is used, for example, in an office or a store. As shown in FIGS. 1 and 2, the chair 1 includes legs 2, a support base 3, a seat 4, and a backrest 5.

[0017] In the following description, for the sake of convenience of explanation, the side seen from a seated person sitting in a regular posture on the seat 4 is referred to as the "front side Dsf" in the front-rear direction Ds of the chair 1 (see FIG. 2), and the opposite side is referred to as the "rear side Dsb" in the front-rear direction Ds (see FIG. 2). For example, the front side Dsf as seen from the seated person is the front side of the chair 1, and the rear side Dsb as seen from the seated person is the rear side of the chair 1. Also, the left side as seen from the seated person is referred to as the "left side Dwl" in the left-right direction Dw of the chair 1, and the opposite side (right side) is referred to as the "right side Dwr" in the left-right direction Dw. Further, the upper side as seen from the seated person is referred to as the "upper side Dvu" in the up-down direction Dv of the chair 1, and the opposite side is referred to as the "lower side Dvd" in the up-down direction Dv.

[0018] The legs 2 contact the floor surface F and support the support base 3, the seat 4, and the backrest 5 directly or indirectly from the lower side Dvd. The legs 2 have multi-forked legs 2a and a leg post 2b. The multi-forked legs 2a have a plurality of leg bodies 2a1 extending radially from the central portion and casters 2a2 provided at the tip ends of the respective leg bodies 2a1. Each caster 2a2 is in rolling contact with the floor surface F.

[0019] The leg column 2b is provided in the center of the multi-branch leg 2a, rising upward Dvu from the multi-branch leg 2a. The leg column 2b has an outer cylinder 2b1 and an inner cylinder 2b2. The outer cylinder 2b1 is fixed to the multi-branch leg 2a. The lower part of the inner cylinder 2b2 is connected to the outer cylinder 2b1 and is connected to the outer cylinder 2b1 so as to be movable in the vertical direction Dv. The inner cylinder 2b2 is supported by, for example, a spring (not shown) housed inside the leg column 2b. The upper end of the inner cylinder 2b2 is fixed to the support base 3. Such a leg column 2b supports the seat 4 so as to be movable in the vertical direction Dv via the support base 3.

[0020] The support base 3 is a box-shaped part located on the upper side Dvu of the leg portion 2. Inside the support base 3, for example, there is 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 of 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 sitter sits directly, and its upper surface facing the upper side Dvu is the seating surface. The chair 1 may also be equipped with armrests on which the sitter's elbows and arms are rested. Such armrests may be fixed to the side of the seat 4, for example.

[0021] The backrest 5 is the part that supports the seated person's back and head from the rear side Dsb. As shown in Figures 1 to 3, the backrest 5 comprises a backrest body 51 and a headrest 52.

[0022] The backrest body 51 is the part that primarily supports the seated person's back from the rear side Dsb. The backrest body 51 has a connecting part 510, a frame 511, and a first surface material 512. As shown in Figure 2, the connecting part 510 is connected to the support base 3 with the frame 511 supported from the lower side Dvd. The connecting part 510 is composed of a first connecting part 510a that is engaged with the support base 3 and is tiltably connected by the tilting mechanism described above, and a pair of second connecting parts 510b that branch out from the first connecting part 510a and extend upward to the Dvu. Detailed illustrations are omitted, but the first connecting part 510a is, for example, cylindrical with a rectangular opening towards the front side Dsf, and is housed inside with at least a part of the tilting mechanism fitted onto it. The pair of second connecting portions 510b are positioned rearward Dsb from the seat 4 and spaced apart in the lateral direction Dw. Thus, the entire connecting portion 510 is held in a tiltable manner with respect to the support base 3.

[0023] The frame 511 forms the skeletal part of the backrest 5. The frame 511 is made of, for example, a synthetic resin material or a metal material. In this embodiment, the frame 511 has a lower frame rod 511a, an upper frame rod 511b, and a pair of side frame rods 511c.

[0024] The lower frame rod 511a connects the upper ends of each of the pair of second connecting parts 510b in the left-right direction Dw. The upper frame rod 511b is positioned above the lower frame rod 511a in the left-right direction Dvu and extends in the left-right direction Dw. The pair of side frame rods 511c are spaced 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 positioned 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 portion of the lower frame rod 511a and the right side Dwr portion of the upper frame rod 511b in the up-down direction Dv. On the other hand, the left-side frame rod 511c of the pair of side frame rods 511c, positioned on the left side Dwl, extends in the vertical direction Dv, connecting 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.

[0025] 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.

[0026] The first surface material 512 is provided on the frame 511 so as to cover the frame opening 51h of the frame 511 from the front side Dsf. The first surface material 512 is fixed to the frame 511 by (tacking) by being fixed inside grooves 51g formed in each of the lower frame rods 511a, upper frame rods 511b, and side frame rods 511c. The first surface material 512 is made of, for example, cloth or leather. The first surface material 512 may also be made of a tensioning material such as mesh.

[0027] The headrest 52 is primarily a part that supports the occupant's head from the rear side Dsb. The headrest 52 is attached to the backrest body 51. The headrest 52 comprises a headrest body 521, a second surface material 522 (surface material), and a mounting part 523.

[0028] As shown in Figure 3, the headrest body 521 is composed of multiple components. For convenience, the second surface material 522 is not shown in Figure 3. The headrest body 521 is attached to the frame 511 by a mounting portion 523. The headrest body 521 is positioned above the frame 511 on the Dvu side.

[0029] 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 511 by the mounting portion 523, will be explained below with reference to the drawings from Figure 4 onwards.

[0030] First, the upper frame rod 511b of the frame body 511 described above will be explained. As shown in Figure 4, the upper frame rod 511b has a first upper surface 511e facing upward 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 so as they face left-right direction Dw. In this embodiment, the upper surface 511d of the upper frame rod 511b is formed by these first upper surface 511e and second upper surfaces 511f. The second upper surface 511f is curved so as it faces left-right direction Dw, it moves away from the headrest body 521. The second upper surface 511f is also smoothly connected to the first upper surface 511e and to the left-right side surfaces 511s of the side frame rod 511c that face left-right direction Dw.

[0031] Furthermore, the upper frame rod 511b has a receiving recess 511g that is recessed from the surface facing the rear side Dsb toward the front side Dsf. The receiving recess 511g extends in the left-right direction Dw. In addition, the upper frame rod 511b has a connecting hole 511h formed on the inner surface of the receiving recess 511g that is recessed from the surface facing the rear side Dsb toward the front side Dsf. A connector 523n such as a bolt can be connected to the connecting hole 511h. In this embodiment, the two connecting holes 511h are spaced apart in the left-right direction Dw. Also, the groove 51g formed in the upper frame rod 511b extends in the left-right direction Dw along the first upper surface 511e and the second upper surface 511f above the receiving recess 511g Dvu.

[0032] Next, the mounting portion 523 will be described. The mounting portion 523 is formed of, for example, a synthetic resin material. However, the mounting portion 523 may also be formed of a metal material or the like. As shown in Figures 5 and 6, the mounting portion 523 has a closing portion 523a, an insertion portion 523b, and a fixing portion 523c.

[0033] The sealing portion 523a is placed on the upper surface 511d of the upper frame rod 511b via a first surface material 512 (not shown). The sealing portion 523a has a first portion 520a that extends 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 that are connected to the first portion 520a from both sides in the left-right direction Dw and extend in the left-right direction Dw along the curvature of the second upper surface 511f of the upper frame rod 511b. The dimensions of these first portion 520a and second portions 520b in the front-rear direction Ds are the same as the dimensions of the upper frame rod 511b in the front-rear direction Ds.

[0034] As shown in Figure 6, the first portion 520a has a first surface 520a1 facing upward Dvu and a second surface 520a2 facing the opposite side (downward Dvd) from the first surface 520a1. These first surface 520a1 and second surface 520a2 are formed smoothly. The second surface 520a2 is positioned parallel to the first upper surface 511e of the upper frame rod 511b. The second surface 520a2 faces the first upper surface 511e with the first surface material 512 sandwiched between them from upward Dvu. The first surface material 512 is positioned without any gaps between the second surface 520a2 and the first upper surface 511e.

[0035] Furthermore, the first portion 520a has a raised portion 520p formed thereon, which, together with the tacking portion 521p of the inner shell 521a described later, collects and holds the second surface material 522 of the headrest 52. 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.

[0036] Each of the pair of second portions 520b has a first curved surface 520b1 that is connected to the first portion 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 on the opposite side from the first curved surface 520b1 and curves along the second upper surface 511f. The second curved surface 520b2 is smoothly connected to the second surface 520a2 of the first portion 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 in between. The first skin material 512 is arranged without gap between the second curved surface 520b2 and the second upper surface 511f. Therefore, the first surface material 512 forms the upper surface of the backrest body 51.

[0037] The insertion portion 523b is the portion of the first part 520a that extends upward from the first surface 520a1 toward the upper side Dvu. As shown in Figure 3, the insertion portion 523b is the portion that is inserted into the headrest body 521 and fixed to the headrest body 521. As shown in Figure 5, in this embodiment, the insertion portion 523b is formed integrally with the closing portion 523a. The insertion portion 523b is positioned between two raised portions 520p formed on the first part 520a. The insertion portion 523b is also positioned in the center of the first surface 520a1 of the first part 520a.

[0038] As shown in Figure 6, the insertion portion 523b has a rectangular shape when viewed from the front side Dsf. Also, as shown in Figure 5, the insertion portion 523b is formed such that the width dimension in the front-rear direction Ds gradually decreases as it moves towards the upper side Dvu. The insertion portion 523b has an engaging claw portion 523i that can engage with the headrest body 521. The engaging claw portion 523i is located in the central part of the insertion portion 523b.

[0039] The fixing portion 523c is the part that fixes the closing portion 523a to the upper frame rod 511b of the frame body 511. The fixing portion 523c is integrally formed with the first portion 520a of the closing portion 523a. The fixing portion 523c is positioned to cover the receiving 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 body 523m, a connector 523n, and a cover 523o.

[0040] The main body of the fixing part 523m extends downward from the rear side Dsb portion of the first part 520a toward the downward side Dvd, and is positioned adjacent to the upper frame rod 511b in the front-rear direction Ds. The main body of the fixing part 523m has a cover housing portion 523g formed therein, which is recessed from the surface facing the rear side Dsb toward the front side Dsf. This cover housing portion 523g fits into a housing recess 511g formed in the upper frame rod 511b. Furthermore, as shown in Figure 3, an insertion hole 523h is formed on the inner surface of the cover housing portion 523g, penetrating the main body of the fixing part 523m from the surface facing the rear side Dsb toward the front side Dsf. In this embodiment, the two insertion holes 523h are spaced apart in the left-right direction Dw. These two through holes 523h are positioned to overlap in the front-to-back direction Ds with the connecting hole 511h formed in the receiving recess 511g of the upper frame rod 511b.

[0041] As shown in Figures 3 and 5, the connector 523n is a bolt screwed through an insertion hole 523h formed in the cover housing portion 523g of the fixing body 523m and a connecting hole 511h formed in the housing recess 511g of the upper frame rod 511b. In other words, the connector 523n connects the fixing body 523m and the upper frame rod 511b, thereby fixing the sealing portion 523a to the upper frame rod 511b. That is, by fixing the fixing body 523m to the upper frame rod 511b with the connector 523n, the sealing portion 523a is immovably positioned on the upper surface 511d via the first surface material 512. The head of the connector 523n is housed within the cover housing portion 523g.

[0042] The cover 523o is positioned to fit into the cover housing portion 523g formed in the fixing body 523m (see Figure 7). Specifically, as shown in Figure 5, the cover 523o is fitted into the cover housing portion 523g by the engagement claw portion of the cover 523o engaging with an engagement recess located in the housing recess 511g. By fitting into the housing recess 511g, the cover 523o shields the inner surface of the housing recess 511g and the connector 523n from being visible from the outside. The surface of the cover 523o facing the rear side Dsb is flush with the surface of the fixing body 523m facing the rear side Dsb when the cover 523o is fitted into the housing recess 511g (see Figure 7).

[0043] Next, I will explain the headrest unit 521. As shown in Figure 3, the headrest body 521 has an inner shell 521a and a cushioning material 521b. The configuration of the inner shell 521a will be described below with reference to Figures 7 to 9, and the configuration of the cushioning material 521b will be described with reference to Figures 10 and 11.

[0044] As shown in Figure 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. However, the inner shell 521a may also be formed of a metal material. The inner shell 521a is plate-shaped and extends 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 Figure 8, an engaging portion 521j is formed inside the insertion hole 521h into which the engaging 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 engaging claw portion 523i facing downward Dvd comes into contact with the surface of the engaging portion 521j facing upward Dvu, making it difficult for the entire inner shell 521a to be displaced upward Dvu. In other words, the insertion portion 523b of the mounting portion 523 is inserted into the insertion hole 521h of the inner shell 521a and fixed to the headrest body 521.

[0045] Furthermore, as shown in Figures 8 and 9, the inner shell 521a has a lower edge portion 521d that, together with the closing portion 523a, restrains the second surface material 522 when the insertion portion 523b is fixed to the inner shell 521a. As shown in Figure 8, the inner shell 521a in this embodiment has a pair of lower edge portions 521d that extend in the left-right direction Dw and are aligned in the front-rear direction Ds. The lower edge portions 521d have a convex curved surface that is convex toward the downward side Dvd. The insertion hole 521h is located between the pair of lower edge portions 521d that are aligned in the front-rear direction Ds. Specifically, the lower edge portions 521d, together with the first surface 520a1 and the first curved surface 520b1 of the closing portion 523a, restrain the second surface material 522 that covers the headrest body 521 by sandwiching it in the up-down direction Dv. In this embodiment, the second surface material 522 is formed of, for example, fabric or leather. The second surface material 522 may also be formed of a tensioning material such as mesh. For convenience, the second surface material 522 is omitted from the illustration in Figures 7 and 9.

[0046] Furthermore, as shown in Figures 7 and 9, the inner shell 521a has tacking portions 521p, one on each side, that correspond to the raised portions 520p formed in the closing portion 523a. That is, the two tacking portions 521p are spaced apart in the left-right direction Dw with the insertion hole 521h in between. The tacking portion 521p is cylindrical with one end closed, positioned on the upper side Dvu, and opens downwards to the raised portion 520p on the lower side Dvd. The tacking portion 521p houses a cylindrical pressing member (not shown) that extends in the vertical direction Dv. The pressing member presses the raised portion 520p downwards to the lower side Dvd while in contact with the raised portion 520p from the upper side Dvu via the second surface material 522. In other words, the tacking portion 521p holds the second surface material 522 while pressing the raised portion 520p against the lower DVD.

[0047] As shown in Figure 10, the cushioning material 521b is positioned to surround the inner shell 521a while resting on the upper surface 511d of the closing portion 523a. In other words, the cushioning material 521b houses the inner shell 521a. In this embodiment, the inner shell 521a is made of a material such as urethane. As shown in Figure 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 forward Dsf beyond the upper frame rod 511b. The cushioning material 521b is also covered by the second surface material 522. The second surface material 522 is provided so as to overlap the cushion material 521b from the upper side Dvu, covering the entire cushion material 521b and being sandwiched without any gaps between the lower edge portion 521d of the inner shell 521a and the first surface 520a1 and the first curved surface 520b1 of the sealing portion 523a (tacking).

[0048] 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 surface material 512 and the second surface 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.

[0049] According to this embodiment, the following effects and benefits are achieved.

[0050] In this embodiment, the sealing portion 523a of the mounting portion 523 is positioned without gap between the backrest body 51 and the second surface material 522 covering the headrest body 521, making it difficult for dust from the air 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 surface material 522 covering the backrest body 51 and the headrest body 521, the sealing portion 523a seals the gap between the backrest body 51 and the second surface material 522, preventing the captured dust from adhering to each other and forming larger dust particles. Therefore, the backrest 5 can be kept clean.

[0051] Furthermore, in this embodiment, the second portion 520b of the sealing 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 is curved in the left-right direction Dw, the formation of a gap between the sealing portion 523a and the upper frame rod 511b is suppressed. In other words, even if the upper surface 511d of the backrest body 51 is curved so as to be separated from the headrest body 521, a gap is less likely to form between the backrest body 51 and the sealing portion 523a, thus preventing dust from accumulating between the backrest body 51 and the sealing portion 523a.

[0052] Furthermore, in this embodiment, the sealing portion 523a also serves as part of the component for restraining the second surface material 522 that covers the headrest body 521. Therefore, it is possible to suppress an increase in the number of parts of the backrest 5 and to save space around the headrest 52.

[0053] Furthermore, in this embodiment, the second lower edge 521f of the inner shell 521a extends in the left-right direction Dw along 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 body 51 and the second lower edge 521f of the headrest body 521 from increasing in the vertical direction Dv. As a result, the headrest body 521 can secure a larger area.

[0054] Furthermore, since the fixing part 523c that secures the closing part 523a to the upper frame rod 511b is formed integrally with the closing part 523a, the closing part 523a is stably positioned relative to the upper frame rod 511b. As a result, displacement of the closing part 523a when an external force is applied to the mounting part 523 is suppressed. Also, compared to, for example, the case where the closing part 523a and the fixing part 523c are separate parts, the increase in the number of parts of the backrest 5 can be suppressed. Therefore, the backrest 5 can be easily assembled.

[0055] Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to that of the embodiments, and additions, omissions, substitutions, and other modifications to the configuration are possible without departing from the gist of this disclosure.

[0056] For example, as shown in Figure 12, the first surface material 512 is not limited to covering the frame 511 from the front side Dsf as described in the above embodiment, but may also be provided on the frame 511 so as to cover the frame 511 from the rear side Dsb as well. In this case, the frame 511 may further have shells (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 placed between the frame 511 and the shells and the first surface material 512. [Explanation of Symbols]

[0057] 1…Chair 2…Legs 2a…Multi-legged legs 2a1…Leg body 2a2…Caster 2b…Leg column 2b1…Outer cylinder 2b2…Inner cylinder 3…Base 4…Seat 5…Backrest 51…Backrest body 51g…Groove 51h…Frame opening 52…Headrest 510…Connecting part 510a…First connecting part 510b…Second connecting part 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…Connecting hole 511s…Side surface 512…First surface material 520a…First part 520a1…First surface 520a2…Second surface 520b…Second part 520b1…First curved surface 520b2…Second curved surface 520p…Raised part 521…Headrest body 521a…Inner shell 521b…Cushioning material 521d…Lower edge part 521e…First lower edge part 521f…Second lower edge part 521h…Insertion hole 521j…Engaging part 521p…Tacking part 522…Second surface material 523…Mounting part 523a…Closing part 523b…Insertion part 523i…Engaging claw part 523c…Fixing part 523g…Cover housing part 523h…Through hole 523m…Fixing part body 523n…Connector 523o…Cover Ds…Front-to-back direction Dsb…Rear side Dsf…Front side Dv…Up-and-down direction DVD...Downward side Dvu...Upward side Dw...Left and right direction Dwl...Left side Dwr...Right side F...Floor

Claims

1. A backrest comprising a backrest body and a headrest attached to the backrest body, The aforementioned headrest is A headrest body positioned above the aforementioned backrest body, The surface material covering the headrest body, Mounting portion for attaching the headrest body to the backrest body Equipped with, The aforementioned mounting portion is It is provided between the backrest body and the headrest body and has a sealing portion that is sandwiched without any gap between the upper surface of the backrest body and the surface material, The upper surface of the aforementioned backrest body is The first upper surface facing upwards, A pair of second upper surfaces are connected to the first upper surface from both sides in the left-right direction and curve so as to move in the left-right direction that they move away from the headrest body. It has, The aforementioned sealing portion is, The first portion extending in the left-right direction along the first upper surface, A pair of second parts are connected to the first part from both sides in the left-right direction and extend in the left-right direction along the curvature of the second upper surface. has Backrest.

2. The headrest body has an insertion hole that opens downwards, The aforementioned mounting portion is It further has an insertion portion that extends upward from the aforementioned blocking portion, is inserted into the insertion hole, and is fixed to the headrest body, The headrest body is, When the insertion portion is fixed to the headrest body, it has a lower edge portion that, together with the sealing portion, restrains the surface material by sandwiching it between them. The backrest according to claim 1.

3. The lower edge of the headrest body is A first lower edge portion extending in the left-right direction along the first upper surface, A pair of second lower edges are connected to the first lower edge from both sides in the left-right direction and extend in the left-right direction along the curvature of the second upper surface. has The backrest according to claim 2.

4. A backrest comprising a backrest body and a headrest attached to the backrest body, The aforementioned headrest is A headrest body positioned above the aforementioned backrest body, The surface material covering the headrest body, Mounting portion for attaching the headrest body to the backrest body Equipped with, The aforementioned mounting portion is It is provided between the backrest body and the headrest body and has a sealing portion that is sandwiched without any gap between the upper surface of the backrest body and the surface material, The aforementioned mounting portion is It further has a fixing portion which is integrally formed with the aforementioned closing portion and fixes the closing portion to the backrest body. Backrest.

5. A backrest comprising a backrest body and a headrest attached to the backrest body, The aforementioned headrest is A headrest body positioned above the aforementioned backrest body, The surface material covering the headrest body, Mounting portion for attaching the headrest body to the backrest body Equipped with, The aforementioned mounting portion is It is provided between the backrest body and the headrest body and has a sealing portion that is sandwiched without any gap between the upper surface of the backrest body and the surface material, The aforementioned sealing portion is exposed forward between the upper surface of the backrest body and the surface material, and is not covered by the surface material. Backrest.

6. The backrest is provided according to any one of claims 1 to 5. chair.

7. A headrest attached to the main body of the backrest, A headrest body positioned above the aforementioned backrest body, The surface material covering the headrest body, Mounting portion for attaching the headrest body to the backrest body Equipped with, The aforementioned mounting portion is It is provided between the backrest body and the headrest body and has a sealing portion that is sandwiched without any gap between the upper surface of the backrest body and the surface material, The aforementioned mounting portion is It further has a fixing portion which is integrally formed with the aforementioned closing portion and fixes the closing portion to the backrest body. Headrest.

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