JP3530985B2 - Urethane resin chair having polydicyclopentadiene skeleton - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is capable of maintaining sufficient strength as a skeleton material and imparting springiness to a required portion,
Further, the present invention relates to a urethane resin chair having a skeleton made of polydicyclopentadiene, which can be easily treated at the time of recycling, can express various shape designs, and can be lightweight.

[0002]

2. Description of the Related Art Generally, a chair is made of metal, synthetic resin, wood or the like as a material for its skeletal material.
Especially in chairs with legs, strength from the aspect of functionality,
Due to workability in terms of design, metal is frequently used. Further, it is general that urethane foam (for example, integral foam) is integrally molded with these members to form an armrest, a seat portion, and a leg portion.

[0003]

By the way, in recent years, a recycling movement has become popular both in Japan and abroad, and various recycling factories have been constructed. When recycling products, the first problem is separating the materials,
In particular, this is separation of a plurality of materials that are differently treated at the time of recycling and are firmly integrated. For example, even in the case of the above-mentioned chair or the like, it cannot be reused unless the cushion material firmly adhered from the surface of the metal skeleton is peeled off cleanly. Since this work is difficult to mechanize due to the unspecified number of products, we have always relied on human labor, and the more laborious it is to remove a product, the higher the labor cost and the higher the cost of recycled products. I am

When a metal material such as a general stainless steel pipe or plate is used as the material of the skeleton material, complicated processing must be performed to match the three-dimensional skeleton of the seat, It is time-consuming and costly. Moreover, since such a metal material processing method is usually press processing that cannot perform delicate processing, the shape of the skeletal material is restricted, and it is not possible to express the complicated shape design imagined by the designer in the product, and the metal There is a problem in that it is heavy and the weight of the entire chair must be increased, and the risk of damage due to rust or the like must be taken into consideration.

Therefore, in order to solve these problems, it is conceivable to mold the skeleton material with a thermoplastic synthetic resin. However, conventional thermoplastic synthetic resins have sufficient strength to satisfy the function as a skeleton material. There are problems such as not being able to obtain it.

The present invention has been made against the background of such a conventional technique, and can maintain sufficient strength as a skeleton material, can impart a spring property to a required portion, and can be easily treated at the time of recycling. It is an object of the present invention to provide a chair having a skeletal material that can express various shape designs and can be lightweight.

[0007]

A urethane resin chair having a polydicyclopentadiene skeleton according to claim 1 has at least a seat and a backrest formed from polydicyclopentadiene and a skeleton formed integrally with the skeleton. And urethane foam.

A urethane resin chair having the polydicyclopentadiene skeleton material according to claim 2 is characterized in that:
In the chair described above, at least the skeleton member of the backrest portion is configured to have a displaceable shape having an appropriate elastic action when seated. Furthermore, the urethane resin chair having the polydicyclopentadiene skeleton material according to claim 3 is
In the chair according to the second aspect, the displaceable shape is configured such that the upper portion has a thicker wall and the lower portion has a thinner wall when viewed in cross section.

[0009]

In the urethane resin chair having the polydicyclopentadiene skeleton material according to any one of claims 1 to 3, since the dicyclopentadiene is polymerized in the presence of a catalyst in the mold to form the skeleton material by reaction injection molding. As well as being able to maintain sufficient strength as a skeleton material, it is possible to impart a comfortable spring property adapted to the movement of the body to the required portion of the chair. In order to impart such springiness, no special work or addition of parts is required, and the structure can be simplified, and the process can be simplified and the cost can be reduced.

Further, since the skeleton material is manufactured by molding that can easily express a complicated shape, it is possible to express various shape designs imagined by the designer in the product, and it is lighter than the metal skeleton material. Can be realized. Further, at the time of recycling, the skeleton material and the cushion material can be cut into pieces together and sent to the recycle processing step, or can be incinerated together and disposed of without being separated.

Particularly, in the urethane resin chair having the polydicyclopentadiene skeleton material according to claim 2,
At least the skeletal member of the backrest portion has a displaceable shape having an appropriate elastic action when seated. In this specific example, as described in claim 3, the skeletal member of the backrest has a thick upper portion and a thin lower portion when viewed in cross section, so that when the user leans on the back portion, The thin lower part of the backrest twists upward and adheres to the back, adapting to the movement of the body, and in that state it curves backwards around the center of the backrest, which is comfortable for the user's back. Springiness can be imparted. It is also possible to make the portion of the backrest near the seating surface of the skeletal member thinner than the other portions, and take a rocking chair-like response in which the entire backrest tilts.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in Fig. 1, the urethane resin chair is
4 legs 10 made of metal or wood, and a seat 20
And a backrest portion 30.

As shown in FIG. 2, the seat portion 20 has a thickness of 4 m.
m has a skeleton member 21 made of polydicyclopentadiene and having a substantially rectangular shape in a plan view with a peripheral edge portion curved downward, and an example of a skin-like urethane foam having a smooth surface on the upper surface of the skeleton member 21. A urethane integral foam 22 is integrally molded. Polydicyclopentadiene and urethane foam have good adhesion when integrally molded, and will not peel off even if no adhesive is used. In addition, urethane integral foam 22
Can be selected as soft, semi-hard, or hard according to the product type.

The urethane integral foam 22 is thicker in the rear portion of the seat portion 20 than in the front portion thereof, so that the seating sensation of the buttocks of the user is improved. Also, skeletal material 2
A pair of front and rear support frame portions 23, which are also made of polydicyclopentadiene, are integrally formed on the back surface of 1, and the leg portions 10 are assembled with screws at the respective corner portions of the seat portion 20.

As shown in FIG. 1, the backrest portion 30 has two
Both ends are embedded in the upper ends of the legs 10 on the rear side of the book, and are bent backward in an arch shape in an obliquely rearward direction. As shown in FIG. 3, a skeleton material 31 made of polydicyclopentadiene is used to form a smooth skin. -Shaped urethane integral foam 3
2 is integrally molded so as to cover it in an elliptical shape.

The skeleton member 31 has a displaceable shape having an appropriate elastic action when seated. This frame material 31
As a displaceable shape, the upper part is thick (5 to 5
50 mm), and the lower part is thin (2 to 8 mm) in the shape of a jewel. Therefore, the backrest 30 has an appropriate elastic action on the ground contact portion when seated, and a comfortable springiness can be imparted to the back of the user. The skeleton material 31 may have an elliptical shape with a thick upper portion and a thin lower portion when viewed in cross section.

Further, since the skeleton member 31 has a specific portion of the backrest portion, in the present embodiment, the central portion of the portal shape when viewed from above, is thinned so as to be gradually thinned, so that the backrest portion 30 is loaded by the load. Has a structure that restores to the original state when the load tilts and the load is lost. These displaceable shapes are appropriately determined according to the required function, size, and structure of the chair. As described above, according to the urethane resin chair of this embodiment, a single material can realize a structure that has been impossible without the combination of different materials such as springs and leaf springs.

The physical properties of polydicyclopentadiene are as follows: specific gravity 1.03, flexural modulus 19,000 k.
g / cm ² (test method ASTM / D790), bending strength 6
50 kg / cm ² (test method ASTM / D790), tensile strength 450 kg / cm ² (test method ASTM / D63)
8), impact strength 47 (test method ASTM / D256).

Table 1 shows the thickness design of the skeleton member 31 for imparting flexibility to the backrest portion 30.

[0020]

[Table 1]

Generally, the load applied to the backrest portion 30 is 40 to 60 kg, the displacement required for that portion is around 10 to 20 mm, and the set thickness value is 5.
It is 10t.

A method of manufacturing a urethane resin chair having the skeleton materials 21 and 31 of the embodiment will be briefly described. The respective skeleton materials 21 and 31 are molded by a reaction injection molding method by polymerizing dicyclopentadiene in the presence of a catalyst in a reaction injection molding cavity formed between upper and lower molds of a reaction injection molding die. To be done. Examples of the dicyclopentadiene used include liquid A for reaction injection molding in which a catalyst activator such as an alkylaluminum compound is added to dicyclopentadiene, and a stabilized catalyst containing a tungsten compound for dicyclopentadiene. Is added in an appropriate amount to prepare a two-component liquid B for reaction injection molding. In reaction injection molding, the mold temperature of the mold used is 30 to 100 ° C., and the polymerization time is about 10 to 15 minutes.

Next, the molded skeleton materials 21 and 31 are arranged on the lower mold side in the injection molding cavity of the injection molding die,
For example, a soft foamed urethane is injection-molded to form a skeleton material 21, 31 made of polydicyclopentadiene, and a seat portion 2 made of urethane integral foam 22, 32.
0 and the backrest 30 are manufactured.

As described above, since the dicyclopentadiene is polymerized in the presence of a catalyst in the molding die to form the skeleton materials 21 and 31 by reaction injection molding, sufficient strength as a skeleton material is maintained. In addition, it is possible to impart a comfortable spring property that adapts to the movement of the body to the required part of the chair, and it is possible to reduce the weight compared with the conventional one using a skeleton material. Moreover, since the molding die for reaction molding used at the time of manufacturing does not require equipment such as a high-heat heater as compared with the mold for thermoplastic synthetic resin, the cost of the mold can be reduced and at the time of molding. Thermal energy can also be reduced. In addition, since the skeleton members 21 and 31 are manufactured by molding that can easily express a complicated shape, it is possible to express various shape designs that the designer has imagined in products.

Further, the skeleton materials 21 and 31 are not made of a metal material as in the conventional case, but urethane integral foams 22 and 3 are used.
Since it is made of the same synthetic resin as 2, the skeleton materials 21, 31 and urethane integral foam 22,
32 and 32 can be cut into small pieces together and sent to the recycle processing step, or can be incinerated together and disposed of without being separated. Further, the skeleton material 31 of the molded backrest portion 30 has a shape in which the upper portion is thick and the lower portion is thin in a cross-sectional view, while the central portion of the portal shape in plan view is gradually thinned. Therefore, when the user leans on the backrest 30, the thin lower part of the backrest 30 twists upward and adheres to the back in accordance with the movement of the body, and in that state, the central part of the backrest 30. Since it bends backward around the center, a comfortable springiness can be imparted to the back of the user.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and any design change or the like within the scope of the present invention is included in the present invention. For example, in the examples, the skeleton material made of polydicyclopentadiene was used only for the seat portion and the backrest portion, but the present invention is not limited to this, and for example, polydicyclopentadiene is also used for the armrest portion and the leg portion. Good.

Further, although urethane integral foam is adopted as the urethane foam in the examples, other types of urethane foam such as soft, semi-rigid or rigid urethane foam and urethane elastomer are not limited to this. May be adopted. Further, the surface of the urethane foam may be covered with a skin material to give the chair a high-class feel.

[0028]

The urethane resin chair having the polydicyclopentadiene skeleton of the present invention is formed by the flexible dicyclopentadiene, so that sufficient strength as a skeleton is maintained. At the same time, it is possible to add comfortable springiness that adapts to the movement of the body to the required parts of the chair, and it is possible to express various shape designs, and it is possible to reduce the weight.

Further, at the time of recycling, the skeleton material and the cushion material can be finely cut together and incinerated without being separated. Furthermore, in order to impart such a spring property, no special work or addition of parts is required, and the structure can be simplified, and the process can be simplified and the cost can be reduced. it can.

Particularly, in the urethane resin chair having the polydicyclopentadiene skeleton according to claims 2 to 3, the skeleton of the backrest has a displaceable shape having an appropriate elastic action when seated. Therefore, it is possible to impart a comfortable spring property to the back of the user.

[Brief description of drawings]

FIG. 1 is a perspective view of a urethane resin chair having a polydicyclopentadiene skeleton material according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a seat portion.

FIG. 3 is an enlarged sectional view of a backrest portion.

[Explanation of symbols]

20 Seat Part 21 Skeleton Material 22 Urethane Integral Foam (Urethane Foam) 30 Backrest Part 31 Skeleton Material 32 Urethane Integral Foam (Urethane Foam)

Claims (3)

(57) [Claims] 1. A urethane resin having a skeleton material made of polydicyclopentadiene, characterized in that at least a seat portion and a backrest portion have a skeleton material molded from polydicyclopentadiene and a urethane foam integrally molded with the skeleton material. Chair. 2. A urethane resin chair having a skeleton made of polydicyclopentadiene according to claim 1, wherein at least the skeleton of the backrest has a displaceable shape having an appropriate elastic action when seated. 3. The urethane resin chair having a polydicyclopentadiene skeleton material according to claim 2, wherein the displaceable shape has a thick upper portion and a thin lower portion when viewed in cross section.