JP3528460B2 - Chair backrest, seat plate structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strengthen the adhesion of an inner shell and a cushion material, to reduce the manufacturing cost, and to cover the cushion material with a surface seat without forming wrinkles on the surface of the cushion material of a backrest and seat structure which consists of an inner shell with the cushion material on the surface and an outer shell covering the inner shell to which the inner shell is adhered by polymerization. SOLUTION: A cushion body 2 is mounted on the surface of the inner shell 1 of this backrest and seat structure of a chair, and the inner shell 1 is adhered to the outer shell covering it by polymerization. The cushion material 4 is formed by foam molding on the surface of the inner shell 1 with a shell structure base 6 where a plural number of through openings 7 are formed. The cushion material 4 and the inner shell 1 are adhered to each other, and a part of the cushion material 4 is inserted into an opening 7 to the rear surface around the opening to integrally form an anchor part 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backrest plate for a chair,
The present invention relates to a seat plate structure, and more particularly, to a backrest plate and a seat plate structure of a chair formed by joining an inner shell having a cushion body integrated on the front surface side and an outer shell that covers the inner shell.

[0002]

2. Description of the Related Art Conventionally, various backrest plates and seat plate structures for chairs have been provided in which an inner shell having a cushion body mounted on the front side is fitted in an outer shell covering the inner shell in a superposed state. It is mainly designed so that the outer shell and the inner shell can be fitted easily and firmly.

Further, after the cushion material which has been foam-molded in advance is arranged or adhered to the surface side of the inner shell, the surface of the cushion material is covered with a skin sheet such as cloth or leather to join the inner shell and the outer shell. There is provided a structure in which an edge portion of a skin sheet is sandwiched between both shells. However, it is not preferable to simply dispose the cushion material on the front surface side of the inner shell because it is difficult to position the cushion material during the assembling work and the cushion material is displaced and biased during use. On the other hand, in the case where the cushioning material is adhered to the surface side of the inner shell during the assembly work, not only the application process of the adhesive is required, but also the curing time of the adhesive is required. Not preferable. Further, the work of stretching the skin sheet on the surface of the cushion material without drawing wrinkles requires skill and is time-consuming.

Therefore, after the inner shell is placed in the foam molding die of the cushion material, the cushion material is foam-molded on the surface side of the inner shell, so that the inner shell and the cushion material can be bonded during foam molding. Although proposed, the adhesive strength is insufficient only by the adhesive force when the cushion material is foamed, and there is a risk of peeling from the inner shell.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention is to solve the problem that an inner shell having a cushion body mounted on the front side is joined to an outer shell covering the inner shell in a superposed state. In the backrest plate and seat plate structure of a chair that is made up of, the inner shell and the cushioning material have a high adhesive strength and contribute to the reduction of the manufacturing cost. Furthermore, the surface of the cushioning material can be covered without wrinkling. The point is to provide a backrest plate and a seat plate structure of a chair that can be easily arranged.

[0006]

In order to solve the above-mentioned problems, the present invention relates to a chair in which an inner shell having a cushion body mounted on the surface side is joined to an outer shell which covers the inner shell in a superposed state. It has a backrest plate and a seat plate structure .
After placing the cushion material molding die within, on the surface side of the inner shell <br/>, when the cushion material is foamed simultaneously molded cookie
Foam composition that adheres to the inner shell by the adhesive force of the cushioning material and forms a cushioning material
Part of the resin is from the opening and the back surface of the shell structure substrate and the mold
Backrest plate forcibly extruded formed by integrally forming an anchor portion at a portion elaborate around the <br/> backside periphery of the shell structure substrate chair between the inner surface, to constitute a seat plate structure .

[0007] Here, it is more preferable that a recessed step portion that promotes the wraparound of the cushion material at the time of foam molding is formed on the back surface side of the inner shell and at a part or the entire peripheral portion of the peripheral edge portion of the opening. .

Further, a holding plate having a plane shape corresponding to the shape of the opening is stepped down from a part of the inner peripheral edge of the opening formed on the back surface side of the inner shell and around the shell structure substrate. It is more preferable that the shell structure substrate is integrally molded toward the outside, and in this case, a saw-toothed protrusion is formed on the surface of the holding plate facing the opening.

Furthermore, if the skin sheet is integrally adhered to the surface of the cushion material during foam molding, the inner shell can be integrated with the cushion material and the skin sheet during foam molding of the cushion material, and the surface of the cushion material can be integrated. The skin sheet can be easily stretched without wrinkling.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a more detailed description will be given based on an embodiment of the present invention shown in the accompanying drawings. FIG. 1 is an overall perspective view of a chair according to the present invention, FIG. 2 is a rear view of a state in which an inner shell and a cushion material are integrated, and FIG. 3 is an enlarged cross-sectional view of a main part thereof, in which 1 is an inner shell, Reference numeral 2 indicates a cushion body, and 3 indicates an outer shell.

The chair according to the present invention, as shown in FIG.
The seat back portion C supported by the legs A is attached with the backrest portion C via the backrest support rods C1 and C1 which are covered with bellows rising upward from both sides of the rear portion. The backrest part C has a structure capable of sliding forward and backward and tilting forward and backward. The seat plate and the backrest plate that form the seat portion B and the backrest portion C have an inner shell 1 inside, a cushion body 2 is arranged on the front surface side, and an outer shell 3 on the back surface side. It has an overturned structure. Furthermore,
The cushion body 2 has a structure in which the surface of a cushion material 4 made of synthetic resin foam is covered with a skin sheet 5 such as cloth or leather. In this embodiment, the structure of the backrest plate of the chair is illustrated, but the basic technical idea of the seat plate is the same.

The present invention provides a backrest plate and a seat plate structure of a chair in which an inner shell 1 having a cushion body 2 mounted on the surface side is joined to an outer shell 3 which covers the outer shell 3 in a superposed state, The cushion material 4 is foam-molded on the front surface side of the inner shell 1 having a plurality of openings 7, ... The gist is that it is made to wrap around and be integrated.

Here, in order to foam-mold the cushion material 4 on the surface side of the inner shell 1, the inner shell 1
Is placed in a foam molding die (not shown) of the cushion material 4, a foamable synthetic resin is injected into the surface side of the inner shell 1, and the synthetic resin is foamed by heating or the like to mold the cushion material 4. Of. In this case, the inner shell 1 and the cushioning material 4 are formed by the cushioning material 4 during foam molding.
The material is adhered by the adhesive force of the material and part of the foamed synthetic resin forming the cushion material 4 is extruded from the opening 7 to the back surface side of the shell structure substrate 6 by the foaming pressure. Here, in this embodiment, polyurethane foam is used as the material of the cushion member 4.

Then, as shown in FIGS. 2 and 3, a part of the cushion material 4 that wraps around the back surface of the shell structure substrate 6 from the opening 7 serves as an anchor portion 8. The anchor portion 8 is formed by being forcedly extruded between the inner surface of the mold and the back surface of the shell structure substrate 6 of the inner shell 1 that is inserted in close contact with the inner surface of the foam molding die. Therefore, the thickness should not be so thick.

Therefore, on the back surface side of the inner shell 1, a recessed step portion 9 is formed on a part or the entire peripheral portion of the opening 7 so that the cushion material 4 can be foamed at the time of foam molding. It is preferable to promote the wraparound of the anchor portion 8 and form the anchor portion 8 having a sufficient thickness in order to increase the peel strength of the cushion material 4 from the inner shell 1. In this case, between the back surface of the shell structure substrate 6 of the inner shell 1 inserted in the foam molding die of the cushion material 4 and the inner surface of the die, a space continuous with the cavity is formed by the concave step portion 9. Therefore, the foamed synthetic resin is reliably filled in the space formed by the recessed step portion 9 even if the foaming pressure is small. Therefore, the anchor portion 8 having a desired thickness is formed, and the inner shell 1
The peeling strength of the cushioning material 4 against the above can be dramatically increased.

The inner shell 1 is integrally molded of synthetic resin, and a plurality of reinforcing ribs 10, ... Are formed in a lattice pattern on the back surface of the shell structure substrate 6.
Further, the shell structure substrate 6 of the inner shell 1 is formed with a plurality of engaging openings 11, ..., And engages with the engaging claws (not shown) projectingly provided on the joint surface side of the outer shell 3 so as not to come out. The outer shell 3 is joined to the back side of the inner shell 1 to cover it. Here, even if the protrusion amount of the cushion material 4 to the back surface side of the inner shell 1 varies in each opening 7, ..., The reinforcing rib 1
0 to the outer shell 3 or the outer shell 3
By joining to a similar reinforcing rib protrudingly provided on the joining surface side, it is possible to absorb the variation in foam molding.

Further, as another embodiment shown in FIGS. 5 to 8, the back side of the inner shell 1 is
The opening 7B formed around the shell structure substrate 6,
The holding plate 12 having a planar shape corresponding to the shape of the opening 7B is integrally molded toward the outside of the shell structure substrate 6 in a stepped state from a part of the inner peripheral edge portion of. That is, the opening 7
A height-retaining portion 13 extends from the edge of B to the back surface side of the shell structure substrate 6, and the holding plate 12 extends outward from the height-retaining portion 13 to form an extension surface of the back surface of the shell structure substrate 6. A predetermined space is formed between the holding plate 12 and the surface facing the opening 7B.
By this holding plate 12, the anchor portion 8 that has wrapped around from the opening 7B to the back surface side of the shell structure substrate 6 during foam molding of the cushion material 4 restricts further excessive protrusion to the back surface side.

Further, serrated projections 14, ... Are formed on the surface of the holding plate 12 facing the opening 7B. The protrusion 14 has an edge portion of the skin sheet 5 stretched on the surface of the cushion material 4 along the back surface of the shell structure substrate 6 and is sandwiched between the shell structure substrate 6 and the holding plate 12 to form the skin sheet. This is for making it difficult for the edge of No. 5 to come off.

Further, a plurality of large openings 7A, ... Are formed in the central portion of the shell structure substrate 6, and the portion of the shell structure substrate 6 between the adjacent openings 7A, 7A is projected to the surface side. An embedded portion 15 is formed to be embedded inside the cushion material 4 when the cushion material 4 is foam-molded. By burying the embedded portion 15 inside the cushion material 4, the peeling strength of the cushion material 4 from the inner shell 1 can be further increased.

Further, as still another embodiment, the one shown in FIGS. 9 and 10 has openings 7B, ... Not shown at substantially equal intervals along the peripheral edge of the shell structure substrate 6 of the inner shell 1. Then, the holding plate 12 is stepwise dropped from a part of the inner peripheral edge of the opening 7B on the back surface side of the shell structure substrate 6 and integrally molded toward the outside of the shell structure substrate 6 to form a cushion. The edge portion 5A of the skin sheet 5 stretched on the surface of the material 4 is forcibly held by tightly holding the wire 16 between the shell structure substrate 6 and the holding plate 12, that is, between the anchor portion 8 and the holding plate 12. It was done. The wire 16 is tightly attached along the contour formed by each of the height-retaining portions 13, ..., As a result, the skin sheet 5
The edge 5A is firmly held. In this case, the treatment of the edge portion 5A of the skin sheet 5 becomes extremely simple.

Then, as described above, the cushion material 4
The inner shell 1 is integrated at the time of foam molding of, but the outer skin sheet 5 is also inserted and disposed in the foam molding die of the cushion material 4, and the inner shell 1 and the outer skin sheet 5 are formed.
By foam-molding the cushion material 4 in between, the cushion material 4 and the skin sheet 5 can be simultaneously adhered, and the skin sheet 5 can be stretched on the surface of the cushion material 4 without wrinkling. Become.

As described above, since the shell structure substrate 6 of the inner shell 1 has a plurality of openings 7, ... In this case, when a compressive force acts on the cushion body 2, the air inside the cushion body 2 flows to the back surface side of the shell structure substrate 6 through the opening 7 and has the original cushioning property of the cushion body 2.

[0023]

According to the backrest plate and seat plate structure of the chair of the present invention as described above, the following remarkable effects are exhibited.

According to the first aspect of the present invention, in the backrest plate and the seat plate structure of a chair, the inner shell having the cushion body mounted on the front surface side is joined to the outer shell covering the outer shell in a superposed state. The adhesive strength between the cushion material and the cushion material is high, that is, the peel strength of the cushion material with respect to the inner shell is extremely high, and it contributes to reduction in manufacturing cost.

According to the second aspect of the present invention, the presence of the recessed step portion promotes the wraparound of a part of the cushion material toward the back surface side of the shell structure substrate during foam molding of the cushion material.
Since the anchor part with a sufficient thickness can be formed,
The peeling strength of the cushion material with respect to the inner shell can be further increased.

According to the third aspect, it is possible to restrict the excessive protrusion of the anchor portion, which is formed by wrapping around from the opening to the back surface side of the shell structure substrate at the time of foam molding of the cushion material, to the back surface side. it can.

According to the fourth aspect, the edge of the skin sheet stretched on the surface of the cushion material is along the back surface of the shell structure substrate, and is sandwiched between the shell structure substrate and the holding plate by the projection. It is possible to make it difficult for the edge of the skin sheet to come off.

According to the fifth aspect, when the cushion material is foam-molded, the inner shell and the cushion material can be integrated, and the cushion material and the skin sheet can be simultaneously bonded and integrated. By the foaming pressure of, the skin sheet can be stretched on the surface of the cushion material without wrinkling.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a chair according to the present invention.

FIG. 2 is a partial rear view of an inner shell in which a cushion material is integrated.

FIG. 3 is a cross-sectional view taken along line XX of FIG. 2, showing a state in which a part of the cushion material has wrapped around the back surface side of the opening of the inner shell.

FIG. 4 is a simplified partial cross-sectional view showing a state in which a part of the cushioning material wraps around when a recessed step portion is formed in the peripheral portion of the back surface of the opening.

FIG. 5 is a simplified rear view of an inner shell showing another embodiment.

FIG. 6 is a partially enlarged rear view of the same.

7 is a cross-sectional view taken along the line YY of FIG.

FIG. 8 is a simplified cross-sectional view showing a state where a cushion body is integrated with an inner shell.

FIG. 9 is a simplified rear view showing a state in which a cushion body is integrated with an inner shell and an edge portion of a skin sheet is tightly attached with a wire.

FIG. 10 is a partially enlarged sectional view of the same.

[Explanation of symbols]

A leg B seat C backrest part C1 backrest support rod 1 Inner shell 2 Cushion body 3 Outer shell 4 Cushion material 5 Skin sheet 6 Shell structure substrate 7,7A, 7B Opening 8 Anchor part 9 Recessed step 10 Reinforcing rib 11 Engagement opening 12 Holding plate 13 Insulated part 14 Protrusion 15 buried part 16 wire

Front page continuation (72) Inventor Shinji Inoue 1-4-12 Imafukuhigashi, Joto-ku, Osaka City Itoki Crebio Co., Ltd. (56) Reference JP-A-4-16481 (JP, A) -28453 (JP, U) Actual opening Sho 58-84747 (JP, U) Actual opening Sho 63-19400 (JP, U) Actual opening Sho 63-47748 (JP, U) (58) Fields investigated (Int.Cl . ⁷ , DB name) A47C 7/00 A47C 31/02 B68G 7/00

Claims (5)

(57) [Claims] 1. A backrest plate and a seat plate structure of a chair in which an inner shell having a cushion body mounted on the front surface side is joined to an outer shell that covers the outer shell in a superposed state, and a plurality of shell structure substrates are provided. Inner shell that penetrates the opening of
After placing the cushion material in the mold,
On the surface side of the Le, at the same time the cushion material to foam molding click
The inner shell is made by the adhesive force of the material
While adhering to Le, foamed if forming the cushion material
Backside and gold portion of synthetic resin shell structure substrate from the opening
The shell structure substrate is forced out between the mold inner surface and
Backrest plate, seat plate structure in the portion where elaborate around the rear surface around the chair to form the anchor portion is characterized by being one <br/> conjugated. 2. The back surface side of the inner shell,
2. A backrest plate and a seat plate structure for a chair according to claim 1, wherein a concave step portion that promotes the wraparound of the cushion material at the time of foam molding is formed in a part or the entire peripheral portion of the opening. 3. The back surface side of the inner shell,
A holding plate having a plane shape corresponding to the shape of the opening is stepped down from a part of an inner peripheral edge portion of the opening formed around the shell structure substrate, and integrally molded toward the outside of the shell structure substrate. The backrest plate and the seat plate structure of the chair according to claim 1. 4. The backrest plate for a chair according to claim 3, wherein a sawtooth-shaped projection is formed on a surface of the holding plate facing the opening.
Seat board structure. 5. The backrest plate and seat plate structure for a chair according to claim 1, wherein a skin sheet is integrally adhered to the surface of the cushion material during foam molding.