JPS6127521B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a street intersection sign installed on a paved surface of a road.

Traditionally, at street intersections where traffic lights have not been installed, markings such as 〓-, 〓-, or cross-shaped markings are made with white paint on the pavement surface of the road to indicate that the intersection is an intersection. Ta. This marking surface has a flat surface and is subject to friction from the tires of vehicles passing over it, so that it can peel off or become contaminated in a relatively short period of time, resulting in poor visibility. They had drawbacks such as aging, impairing traffic safety, and being unsightly.

Additionally, electrical flashing indicators may be buried at street intersections, in which case the flashing windows are so small that daytime visibility is limited despite the considerable installation costs. There are almost zero drawbacks. Furthermore, there are cases where metallic reflector signs are installed on the road pavement in the center of the intersection, but in this case, ground vibrations and noise are generated every time a passing vehicle rides on the sign and passes. In addition, there is a constant risk of tripping for pedestrians, and there are other drawbacks such as dust and dirt that adheres to the surface of the reflector in a short period of time, impairing visibility.

The street intersection sign according to the present invention is colored and coated on the surface on which glass beads are spread and adhered, and on at least two sides of a rectangular polyurethane foam center plate coated with transparent paint. A rectangular polyurethane sign board, on which glass beads are spread and adhered, and the top is coated with a transparent paint, is installed on the paved surface of the road so that it is lower than the height of the central board. It does not have any of the drawbacks found in various street intersection signs such as the above.

The central plate made of rectangular, generally square polyurethane foam is, for example, the Nippon Polyurethane product Coronate 4023 and the company's product Nitsuporan 160.
It is molded by adding a glycol-based chain extender, stirring at high speed, injecting it into a mold, foaming, and releasing the solidified product from the mold, and it generally has a thickness of about 3 to 5 mm. ing.

This polyurethane foam itself is colored, but its surface is painted with a urethane-based white or yellow paint of the same color.
At the same time, fine glass beads are evenly scattered,
Let it dry naturally to harden the glass beads as one piece on the painted surface, and then apply a transparent paint, such as a urethane transparent clear, on the surface, and
Heat and dry at ~80℃ for about 30 minutes.

In addition, rectangular signs made of polyurethane include, for example, Japanese polyurethane product Coronate 4076.
Add an amine chain extender such as Dainippon Ink chemical product Pantex E to the mixture, inject it into a centrifugal casting machine, and form it into a white or yellow chamfered sheet with an arc-shaped edge and a thickness of about 1 to 3 mm. Then, it is manufactured by cutting it into rectangular pieces, for example, 50 x 15 cm. The molding can also be carried out by a calendar molding method, an injection molding method, a press molding method, or the like. On the surface of this colored sheet, the same urethane-based white or yellow paint as above is applied, glass beads are spread and adhered, and a transparent paint is applied.

The polyurethane used as the material for these center plates and sign boards has particularly excellent weather resistance, abrasion resistance, flexibility, and elasticity, and has a hardness (JIS
A) is also excellent in terms of softness, about 40 to 80.
An example of typical physical property values is as follows.

Hardness (JIS A) 90 100% Modulus 70Kg/cm ² Tensile strength 281Kg/cm ² Tear strength 27Kg/cm ² Elongation 540% Resilience 42% Road pavement at street intersections with intersection signs consisting of center board and sign board When installed on a surface, at least two sides of the central board, i.e., a square shape on the two sides of the central board, a square shape on the third side of the central board, or a cross shape on the fourth side of the central board. 2, 3 or 4 sign boards are installed respectively. The center plate and the sign plates attached to each side of the center plate are generally installed so that the opposite sides have the same length and a distance of about 10 mm is maintained between the opposite sides.

In the intersection signs that have been installed, the center board made of foam is installed a little higher than each sign board to improve visibility, but because it is made of foam, the weight of bicycles and pedestrians is added to it. However, its shape is highly deformable and restorable. Furthermore, even when wet due to rain, etc., it is difficult to slip due to the presence of fine glass beads and the transparent paint baked onto their surfaces. In addition, as a result of an abrasion test on the painted surface (a wear test using a rotating abrasion tester equipped with a fixed file tool), the paint film was approximately
It has been found that it can withstand up to 250 wear tests, and it is also resistant to wear caused by wheel tire friction.
It is estimated that it can withstand about 125,000 times of friction.

Regarding visibility, which is most important for intersection signs, the entire sign is not flat, but the center plate is high, and fine glass beads are fixed to the center plate and the surface of each sign board. During the day, they shine white or yellow in the sunlight, and at night they are retro-reflected by the light from the headlights, providing clear markings.

With conventional marking methods, repainting was performed every six months at intersections with heavy traffic, but the intersection sign of the present invention maintains good sign function for at least 4 to 5 years. It is also excellent in terms of economy.

Claims (1)

[Scope of Claims] 1. At least two central plates made of polyurethane foam having a rectangular shape, the surface of which is colored and coated with glass beads and further coated with transparent paint.
On the sides, a rectangular polyurethane sign board with glass beads sprinkled on the colored surface and coated with transparent paint is placed on the paved surface of the road so that the height is lower than the height of the central board. A street intersection sign installed in 2. The street intersection sign according to claim 1, wherein L-shaped sign boards are installed on two sides of the central board. 3. The street intersection sign according to claim 1, wherein a T-shaped sign board is installed on three sides of the central board. 4. The street intersection sign according to claim 1, wherein sign boards are installed in the shape of a cross on the four sides of the central board.