JPH07180121A - Reflection structure, such as round head bolt - Google Patents

Abstract

PURPOSE:To form an optically high reflective surface on the head of a bolt or a rivet and enhance durability by installing a hemispheric head to one end of a rod lever and coating the surface layer of the rod with mirror glass and the outside surface with a transparent film. CONSTITUTION:A hemispheric head 12 is installed to one end of a rod lever 11 where a mirror glass particle-made foil or a scale-like aluminum foil is formed on the outside surface of the head 12 while a clear-painted protection layer 14 is formed on the outside surface. When the outside surface is exposed to a light of a car or an indoor light, the light penetrates through the clear coating layer 14 and is reflected with a layer 13 which includes mirror glass particles inside. The light further penetrate through the clear coating layer 14 once again and reflects the outside. In this case, the reflectance of the mirror glass particles is high and what is more the volume is countless, which scatters the reflected light so that the head of the bolt or the like may be embossed in the reflected light and attract attention effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in bolts and rivets used mainly for displaying road guardrails and driving lanes. In particular, the heads of the bolts are rounded into a hemispherical shape. In addition, the present invention relates to a reflective structure capable of reflecting light with high efficiency when its round head receives light.

[0002]

2. Description of the Related Art In general, a red button with a round head is often used as a stop button for an electric control panel used for machine tools and other mechanical equipment. Further, a round head bolt as shown in FIG. 3A or a rivet as shown in FIG. 3B (hereinafter simply referred to as a bolt) is used for a guardrail installed on a dangerous road such as a mountain road. In some cases, in order to clearly show its existence, it is considered that the round heads such as bolts used there are painted red to draw the driver's attention.

[0003]

However, the stop button and rivets are simply painted in red,
Alternatively, since it is only molded with a red resin, the reflection when exposed to the light of an interior light or the headlight of an automobile is weak and its visibility is poor. Moreover, its reflection performance is polluted by rainwater or dust when used for a long period of time, and its visibility is further reduced.

On the other hand, as a material having excellent reflectivity, so-called Scotch tape (registered trademark), which is a thin film of synthetic resin coated with powdered glass, is known. It is clear that if this is attached to the stop button or rivet, the visibility will be improved, but since the Scotch tape is made flat, it can be attached to the surface of a round head. Involved many difficulties. That is, in order to attach a flat thin film to a hemispherical head with a small radius of curvature, the thin film itself must have excellent flexibility, and a flat light emitting film on the hemispherical head such as a bolt. Since the workability of attaching the is not high,
Despite the fact that the bolts and the like are mechanical elements that require a very large amount, if they are attached one by one, it is expected that the cost will rise significantly.

[0005]

The present invention solves the above problems by
A hemispherical head is provided at one end of the rod, and at least the surface layer portion of the hemispherical head is constituted by powder of mirror glass and a transparent coating film covering the outer surface of the hemispherical head. More specifically, a hemispherical head is formed at one end of the rod, a reflection layer containing powder of mirror glass is formed on the outer surface of the rod, and a clear coating film layer is formed on the outer surface, or It has a hemispherical head formed of a synthetic resin mixed with powder of mirror glass at one end of a rod and the problem is solved by applying clear coating to the outer surface of the formed hemispherical head.

[0006]

[Function] When the head of a bolt or the like is hit by a lamp in a car or a room, the light penetrates the layer of clear coating, is reflected by the layer containing the powder of mirror glass inside, and again passes through the layer of clear coating to external. Reflect to. Since the powder of mirror glass has a high reflection efficiency and is innumerable, the reflected light is scattered and the heads of bolts and the like appear to float. The clear coating prevents humans from directly touching the mirror glass powder that forms the reflective surface, and prevents rainwater and dust from pouring down.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In the figure, 10 is a round head bolt, which is an example of a bolt, or a round head rivet. A bolt 10 or the like is an article forming the reflecting structure of the present invention, and is a rod rod 11 made of a mild steel round bar provided with a hemispherical head 12 at one end. In the example shown in FIG. 1, the hemispherical head 12 is made by upsetting (upsetting) one end of the rod rod 11, and in the example shown in FIG. 2, the rod rod 11 made of mild steel is used.
In the same manner, one end of the same is expanded into a quadrangle by upsetting, and a hemispherical head 12 is formed there by molding a synthetic resin and attached so as not to fall off or rotate.

According to the present invention, a reflecting structure is formed on ten hemispherical heads such as bolts prepared as described above. That is, a reflecting structure for diffusely reflecting light rays with high efficiency is provided at least on the surface layer of the hemispherical head 12 formed at one end of a rod rod 11 forming a bolt 10 or the like. The reflective structure includes a reflective layer 13 having a thickness of 0.5 to 1.0 mm containing mirror glass powder and a transparent coating film 1 having a similar thickness covering the outer surface thereof.
It has a double structure with 4.

The outer surface of the reflective layer 13 is spherical, and the light incident on the reflective layer 13 is expanded to a wide angle and reflected, and at the same time, the reflective layer 13 is composed of powder of mirror glass and commercially available scaly aluminum powder. It is designed to be diffusely reflected by countless powders. The protective layer 14 is provided so that rainwater and dust do not come into contact with the reflective layer 13 to fog the reflective surface thereof, thereby deteriorating the reflective performance. This reflecting structure can minimize the cost of practical use because the commercially available round head bolts and round head rivets shown in FIG. 3 can be used as they are.

Next, the reflecting structure of the bolt 10 shown in FIG. 1 will be described. First, a coating material colored with a pigment is applied to the outer surface of the hemispherical head 12 as an adhesive, and powder of mirror glass is sprinkled on the coating to form a reflective layer 13, which is then clear. A protective layer 14 made of paint is applied and formed. The powder of the mirror glass is obtained by vacuum-depositing a thin film of aluminum on one surface or both surfaces of a rainwater glass plate having a thickness of several tens of microns and then crushing it into pieces. As is well known, clear coating is a coating method in which a transparent and hard coating material is applied to the surface of an object. This type of reflective structure minimizes the cost of practical application in that commercially available round head bolts and round head rivets can be used as the material.

The means for adhering the powder of the mirror glass to the hemispherical head 12 is not limited to the above-mentioned method, but the powder of the mirror glass is mixed in the paint, and the powder of the paint and the mirror glass is mixed. Needless to say, the hemispherical head 12 may be simultaneously sprayed and bonded or laminated. Furthermore, the powder of the mirror glass is not necessarily limited to this, and there is no great difference in the effect even if the powder of the mirror glass is used or a commercially available scaly aluminum powder is used together with the powder of the mirror glass.

In the bolt 10 shown in FIG. 2, the hemispherical head portion 12 is made of a material different from that of the rod rod 11. At one end of the rod rod 11, a quadrangular head portion 11a that is slightly enlarged is formed, and a hemispherical head portion 12 is formed in the enlarged portion. That is, using a synthetic resin mixed with powder of mirror glass or scale-like aluminum powder, a hemispherical head 12 is formed on the enlarged portion by an injection molding method, and the head 12 is attached at the same time. In the above step, clear coating is performed, and a protective layer 14 made of a transparent synthetic resin coating film is formed on the outer surface of the molded hemispherical head 12. This reflective structure is head 12
Since the reflective layer 13 is formed at the same time as molding, it is possible to manufacture an extremely large amount of bolts 10 at low cost.

Since the bolt 10 and the like have the reflection structure shown in the above-mentioned embodiment, when the head of the bolt 10 and the like is hit by a lamp in a car or a room, the light reaches the reflection layer 13 through the protective layer 14. Since the reflective layer 13 has a hemispherical shape as a whole, and is composed of innumerable powder having a high reflective efficiency such as mirror glass and scale-shaped aluminum, the light hitting it diffuses widely, And, it is reflected again to the outside through the layer of clear coating without being greatly attenuated. Therefore, the heads such as bolts are exposed to light and appear to float.

Thus, when the bolt 10 or the like is bolted to a road guardrail, the surface of the guardrail is clearly reflected when exposed to the light of an automobile, so that the driver can visually recognize the position of the guardrail. Contribute to safe driving. Further, since the reflective layer 14 is covered with the protective layer 13 formed by clear coating, the reflective performance can be maintained for a long period of time even if it receives dust or rainwater sprayed thereon.

Incidentally, in the above-mentioned embodiment, the reflection layer 13
Although the substance forming the is described as a mirror glass, the term "mirror glass" in the present invention is not limited to a glass powder made of a mirror as a raw material, and includes a powder having a high reflective efficiency such as scale-like aluminum. It goes without saying that it is a concept.

[0016]

Industrial Applicability As described above, according to the present invention, the outer surface of the hemispherical head formed on the bolt or the like is formed from the powder of mirror glass or the aluminum foil in the form of scale and the transparent coating film covering the outer surface. Since such a reflective structure is formed, the light incident thereon is reflected without directivity and diffusely reflected by the reflective layer, so that the reflection of the light on the head becomes conspicuous. In addition, mirror glass powder, scale-like aluminum foil, or the like is applied to form the layer, or the resin is molded with a synthetic resin mixed therein, so that bolts and the like can be manufactured with high productivity. Further, since the reflective layer is covered with the protective layer and is less likely to be damaged by the environment, there is an effect that the durability can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a bolt and the like showing an embodiment of the present invention.

FIG. 2 is a sectional view corresponding to FIG. 1 showing another embodiment.

FIG. 3 is a front view showing a conventional bolt (a) and a rivet (b).

[Explanation of symbols]

10 ... Bolt (round head bolt or round head rivet) 11 ... Rod rod 12 ... Hemispherical head 13 ... Reflective layer 14 ... Protective layer of transparent coating film

Claims (4)

[Claims] 1. A hemispherical head is provided at one end of a rod rod, and at least the surface layer of the hemispherical head, which is a spherical surface, is composed of mirror glass powder and a transparent coating film covering the outer surface thereof. Reflective structure such as round head bolt. 2. A hemispherical head is formed at one end of a rod, and a reflecting layer containing powder of mirror glass is formed on the outer surface of the spherical surface, and a clear coating film layer is formed on the outer surface. Reflective structure such as round head bolts. 3. A hemispherical head formed by a synthetic resin mixed with powder of mirror glass at one end of a rod, and a clear coating is applied to the outer surface of the formed hemispherical head. Reflective structure such as round head bolts. 4. A reflecting structure such as a round head bolt according to any one of claims 1 to 3, wherein scale-like aluminum powder is used in place of or together with the mirror glass powder.