JPH11128020A - Seat body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain an excellent sitting feeling and a comfortable touch with a low cost by permitting a cushion body to be in a bi-folding state with a core material at an inner side and holding a frame supporting the cushion body between them. SOLUTION: A hard chip urethane layer 23 is formed by being hardened in a state where it is pressurized against the inner side of a bisection-formed containing part 17 and a surface is covered by a slab urethane 19 with cushion property. A cushion body 5 is the bi-folded one consisting of a front cover part 5a and a rear cover part 5b and a recessed part 12 coinciding with the shape of a frame 4 is formed at the inner sides of the front and rear cover parts 5a and 5b. An upper end edge 13a and a left and right side edges 14 are integrated and made to be in a bag-shape in the upper part 13 of the cushion body 5. The recessed part 12 is also formed at the inner side of the bag-shaped part. The left and right side edges of the front and rear cover parts 5a and 5b and a lower end edge are separated in the intermediate part 15 and the lower part 16 of the cushion body 5, which are continued from the upper part 13, the housing part 17 communicating with the bag-shaped part is formed between the both.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat which can be used as a backrest or a seat of a chair, and more particularly to a seat having a core member, which receives a load from a seated person, incorporated in a cushion body.

[0002]

2. Description of the Related Art Conventionally, a cushion body for a chair seat or a backrest has a multilayer structure of a hard synthetic resin layer and a soft synthetic resin layer so as to obtain a good seating feeling.
(For example, see Japanese Patent Publication No. 62-37998), there is a type in which a spring or another elastic body is disposed between a frame and a skin material.

[0003]

However, among the above-mentioned conventional cushion bodies having a multi-layer structure, a large amount of expensive synthetic resin material is required, and the material cost is increased. When it is used, there are problems such as lack of weight, lack of luxury, and insufficient support strength to withstand the load of the occupant.

[0004] Further, when a spring or other padding is provided between the frame and the skin material, the assembling work thereof becomes complicated, and as a result, there is a problem that the manufacturing cost is high.

The present invention has been made in view of the above-mentioned problems of the prior art, and has a low material cost, a good seating feeling and a good feeling, a luxurious feeling, and a seat body capable of withstanding a large load. It is intended to provide.

[0006]

According to the present invention, the above-mentioned problem is solved as follows. (1) A hard chip urethane is used as a core material, and a cushion body is formed by covering the surface with a urethane foam having a cushioning property. It is assumed that a frame supporting the cushion body is sandwiched.

(2) In the above item (1), a space having the same shape as that of the frame is formed on the mating surface of the core material folded in two, and the frame is fitted into the space.

(3) In the above item (2), it is assumed that the cushion body is formed by heating and molding chip urethane in a mold in which urethane foam is laid on the surface of a recess for molding.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment described below, the present invention is applied to a seat body for a backrest of an office chair.
Shows the entire chair (A), and FIG. 2 shows only the backrest (1). FIG. 1 shows a seat body (3) and a backrest (1) attached to a chair body (2) having legs with casters.

As shown in FIG. 2, the backrest (1) comprises a frame (4) with a cushion body (5) on both front and back sides, and a skin material (6) thereon.

As shown in FIG. 3, a frame (4) is composed of a main frame (7) made of a steel pipe bent in a substantially upward U-shape, and a frame (4) disposed inside a lower portion of the main frame (7) and also having a substantially upward U-shape. And a sub-frame (8) made of a short steel pipe bent into a shape. The lower end of the sub-frame (8) is the main frame (7).
Both sides are welded to the left and right vertical rods (7a) (7a) of the main frame (7) so as to be spaced upward from the lower end of the main frame (7). In the center of the section, the chair body
A steel plate (9), which is a connection to (2), is attached by welding.

The backrest (1) is attached to the chair body (2) by bringing the steel plate (9) into contact with the rear end of the chair body (2) and screwing it.

The left and right vertical rods (7a) and (7a) of the main frame (7) have two upper and lower steel pipe reinforcing rods (10) and (10) pointing in the left-right direction.
Are attached by welding. As shown in FIG. 2, these reinforcing rods 10 are greatly curved to the back side.

At the upper end of the frame (4), right and left vertical rods (7a)
(7a) is not connected and opens upward. A spring member (11) suitable for an S-spring meandering up and down and expanding and contracting in the left-right direction is attached to the upper opening. The spring member (11) elastically supports the rearward load applied to the occupant.

[0015] A cushion body to be put on the frame (4).
(5) is a molded body molded into a shape as shown in FIG.

As is apparent from FIGS. 4 and 2, the cushion body (5) is a two-folded shape including a front cover part (5a) and a rear cover part (5b). A recess (12) conforming to the shape of the frame (4) is formed inside the frames (5a) and (5b).

In the upper part (13) of the cushion body (5), the upper end edge (13a) and the left and right side edges (14) are formed in a bag shape integrally with the front and rear. Although not shown, the recess (12) described above is of course also formed inside the bag-shaped portion.

The middle part of the cushion body (5) following the upper part (13)
In (15) and the lower part (16), the left and right side edges and the lower edge of the front and rear cover parts (5a) and (5b) are separated, and between them, a housing part (17) communicating with the bag-shaped part. Are formed.

A method of manufacturing such a cushion body (5) will be described with reference to FIGS. First, a slab urethane (19) obtained by cutting urethane foam having cushioning properties into a sheet is laid in a molding recess (18a) formed on the upper surface of the lower mold (18) shown in FIG. Recess (18a) of lower mold (18)
Has a shape corresponding to the shape of the front side of the backrest (1), and includes a slab urethane previously cut into a desired contour shape.
Lay (19).

Next, a chip raw material (20) in which a urethane chip material and a urethane-based adhesive that reacts with water and heat are mixed well, is evenly sprayed from above the slab urethane (19) to form a chip. A layer of the raw material (20) is formed. Examples of chip materials include Scott foam chips such as cushioning materials, cleaners, filters, etc., chips with skins such as urethane block epithelium and bottom skin, mold foam chips, mold vents and burrs, and three layers for vehicles. It is preferable to use one or several mixtures of cloth-attached chips, such as cutting materials for a laminate, which have a relatively high density and are ground to a particle size of about 5 mm.

After charging the chip material (20) into the lower mold (18),
A core (21) hinged to one end of the lower mold (18),
It is lowered into the recess (18a) of the lower mold (18) as shown by the arrow in FIG. The core (21) has substantially the same shape as the shape of the frame (4), and also has a partition member (21) made of an iron plate having a thickness of about 2 mm for dividing almost the center of the frame (4) into two.
a) is integrally provided.

FIG. 7 shows a state in which the core (21) is lowered into the recess (18a) of the lower mold (18). As is clear from this figure, the core (21) is It does not reach the other end of the recess (18a) of the mold (18), that is, the left end, and the tip of the core (21) and the left end of the recess (18a) of the lower mold (18) A gap is left between them.

Next, the same chip raw material (20) as above is introduced again from above the core (21), and the same slab urethane (19) is laid thereon. Thereafter, when the upper mold (22) is lowered onto the lower mold (18), the state shown in FIG. 8 is obtained.

Steam is injected into the closed upper and lower molds (22) and (18) and heated to cure the adhesive in the chip raw material (20) and complete the molding. (5) is formed.

In the cushion body (5), the chip raw material (20) is made of a core material due to the cushioning property of the slab urethane (19).
The partition member (21a) side of (21), that is, it is cured while being pressed against the inside of the housing portion (17) formed by being divided into two, and a hard chip urethane layer (23) is formed. The surface is covered with cushioning slab urethane (19).

In the above-mentioned manufacturing method, two upper and lower slab urethanes (19) and (19) are used. After laying along the inner surface of (18a) and mounting the chip raw material (20) and the core (21) thereon, it is also possible to use the left half part folded in two so as to cover them. Good.

In place of the core (21), a frame
(4) Attach it in the lower mold (18)
By molding (5), the subsequent assembling work of the cushion body (5) and the frame (4) can be omitted.

FIG. 5 shows that the skin material (6) is connected to the cushion body (5).
It is shown in a state where it is put on top. The skin material (6) is composed of a front fabric (6a) and a back fabric (6b) folded at the top,
In the middle of the front cloth (6a), the front covering cloth (24) is sewn.
Mounted by (25), here lumbar support (26)
Is housed. Fasteners (27) as closing means are attached to the upper and lower edges of the left and right fabrics (6a) and (6b) on the front and rear sides.

For assembly, the frame shown in FIG.
In (4), the cushion body (5) shown in FIG. 4 is inserted first with its bag-shaped upper part, and the recess (12) is fitted to the upper end of the main frame (7) of the frame (4). Fit together. This way,
The recess (12) spans the middle (15) and lower (16)
It matches with (4).

Finally, cover the skin material (6) with the fastener (2)
Closing 7) ends the assembly. As shown in FIG. 5, the skin material (6) may be put on the cushion body (5) in advance.

In this embodiment, the backrest is exemplified. However, the present invention is not limited to the backrest but can be applied to a chair seat or an integrated seat and backrest.

Further, the cushion body (5) does not need to be folded in two to cover the front and rear of the frame (4) as described above, but may be simply attached to only the front surface (or only the rear surface) of the frame (4). In this case, the cushion body may be made of a core material made of hard chip urethane and only one side thereof is covered with urethane foam having cushioning properties.

In order to manufacture such a cushion body having only two layers, the work after mounting of the core (21) in the above-described manufacturing method is omitted, and for example, a concave portion for forming the lower die (18) is formed. Place (1
8a), slab urethane (19) is laid, and the same chip raw material (20) as above is put on the slab urethane (19).
8) Simply place the upper mold of the required shape on top and heat it.

Further, the cushion body (5) is not folded into a bag shape as described above, but is simply folded in two.
It may be placed on a frame, and a skin material (6) may be placed on it.

[0035]

According to the first aspect of the present invention, since a used urethane chip can be used as the core material of the cushion body, the material cost can be reduced and the core material can reduce the load of the occupant. While maintaining sufficient strength to withstand, it has appropriate elasticity different from that of a rigid body, and can cooperate with urethane foam on the surface to provide a comfortable seating feeling and feel. Also, since the core material is cheap and lightweight,
The core material can be made thicker, and the elasticity of the core material and the urethane foam on the surface cooperate with each other, so that a high-class feeling can be obtained.

The frame can receive the cushion body and the load applied thereto, and the front surface of the frame is covered with a core material made of hard chip urethane, so that the presence of the frame can be felt when leaned. In other words, the feeling of hitting the frame can be eliminated, and a good contact feeling can be obtained in combination with the cushioning property of the urethane foam on the surface.

According to the second aspect of the present invention, the work of assembling the frame and the cushion body is simplified, and the both sides of the frame are covered with the cushion body, so that a seat body with good appearance and feel can be provided. it can.

According to the third aspect of the present invention, it is possible to easily and inexpensively manufacture a cushion body having a two-layer structure of a hard layer made of chip urethane and a soft layer made of urethane foam.

[Brief description of the drawings]

FIG. 1 is a side view of a chair in which the present invention is applied to a backrest.

FIG. 2 is a perspective view showing the backrest of the chair shown in FIG. 1 with a cushion body and a part of a skin material cut away.

FIG. 3 is a front view of a frame which is a core material of the backrest shown in FIG. 2;

FIG. 4 is a perspective view of the cushion body shown in FIG. 2;

FIG. 5 is a perspective view showing a state in which the skin material shown in FIG. 2 is put on a cushion body.

6 is a diagram illustrating an initial step of molding the cushion body shown in FIG.

FIG. 7 is a view illustrating a next step of molding the cushion body shown in FIG. 4;

FIG. 8 is a view for explaining the last step of molding the cushion body shown in FIG. 4;

FIG. 9 is a sectional view of the cushion body completed by the steps shown in FIGS. 6 to 8;

[Explanation of symbols]

 (A) Chair (1) Backrest (2) Chair body (3) Seat (4) Frame (5) Cushion (5a) Front cover (5b) Back cover (6) Skin material (6a) (6b) ) Fabric (7) Main frame (7a) Vertical rod (8) Sub-frame (9) Steel plate (10) Reinforcing rod (11) Spring member (12) Concave (13) Top (13a) Top edge (14) Side edge (15) Intermediate part (16) Lower part (17) Housing part (18) Lower mold (18a) Concavity (19) Slab urethane (urethane foam) (20) Chip material (21) Core (21a) Partition member (22 ) Upper die (23) Tip urethane (24) Front covering cloth (25) Sewn part (26) Lumbar support (27) Fastener

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // B29K 105: 04 B29L 31:58

Claims (3)

[Claims] 1. A cushion body is formed by using hard chip urethane as a core material and covering the surface thereof with urethane foam having cushioning properties, and forming the cushion body into a two-fold shape with the core material inside. A seat body having a frame for supporting a cushion body interposed therebetween. 2. The seat body according to claim 1, wherein a cavity having the same shape as that of the frame is formed on a mating surface of the folded core material, and the frame is fitted into the cavity. 3. The seat body according to claim 2, wherein the cushion body is formed by heating and molding chip urethane in a mold in which urethane foam is laid on the surface of the molding recess.