JPH0248486Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a curb for an athletics field (hereinafter simply referred to as "curb").

<Prior Art> In accordance with track and field regulations, track and field stadiums must be provided with curbs that mark the boundary between the field and the track provided around its outer periphery.

Traditionally, this curb is made of concrete blocks,
Originally, the curbs were made of steel strips, etc., but from the standpoint of preventing athletes from falling, the curbs were replaced with rubber or synthetic resin with rubber-like elasticity (hereinafter referred to as "rubber, etc.").
) has been carried out.

<Problems with the prior art> However, when the curb is made of rubber, etc., a core made of metal or the like is required to ensure secure fixation, and this core and the curb made of rubber etc. There was a problem that engagement was not easy.

For example, as shown in FIG. 4, in the case of curb A ₁ having a hollow rectangular cross section, the connection with core body B ₁ is as follows:
Since the base of the curbstone A ₁ will be fitted between the holding pieces B ₂ and B ₂ formed on the core body B ₁ , the holding pieces B ₂ and
B ₂ is exposed to the outside and there is a risk of contact when falling, and there is also the problem that the curb A ₁ comes off more easily than the core B ₁ , which is dangerous, and the cross-sectional shape of the core B ₁ is complicated. Therefore, it was very difficult to form a curve along a curved line, which caused the problem that it became expensive.

As a solution to this problem, the fifth
As shown in the figure, it has been proposed and implemented to glue and fix a curbstone A ₁ made of rubber or the like so as to surround the outer periphery and side surface of the core B ₁ , but the adhesive is uniform over the entire length. In addition to being difficult to treat, a white color is required from an aesthetic standpoint, but the chemical effects of the adhesive can discolor the curb, so a special formulation must be added to the rubber or other composition. However, the drawback was that it was difficult to manufacture.

<Problems to be solved by the invention> In view of the above problems, this invention fully satisfies safety standards, is easy to attach and detach, and
This was done with the purpose of providing a curbstone that is easy to manufacture.

<Technology that solved the problem> The track and field curbstone of this invention has a hard core body with fitting grooves on both sides and a symmetrical cross-sectional shape, It is characterized by comprising a covering made of a rubber-like elastic material, which surrounds three sides of the upper surface and has fitting protrusions formed on the inner surface to removably fit into the fitting grooves.

<Example> This invention will be explained below using examples.

FIG. 1 is a sectional view of an embodiment of this invention.

The curb 1 of this invention has fitting grooves 3, 3 on both side surfaces 2A, 2A, and has a hard core body 2, for example made of aluminum alloy, whose cross-sectional shape is symmetrically shaped as shown in the figure. The hard core body 2 is surrounded by both sides 2A, 2A and the top surface 2B, and has an inner surface 4A.
The cover 4 is made of a rubber-like elastic material and has fitting grooves 3, 3 and fitting protrusions 5, 5 which are removably fitted into the fitting grooves 3, 3, respectively.

In the above embodiment, the hard core body 2 is made of metal such as aluminum alloy, but it can also be made of an extrusion molded body of hard plastic.

Moreover, the correlation shape between the fitting groove 3 and the fitting protrusion 5 is as follows:
As shown in the figure, it is desirable to have a so-called dovetail groove shape in which the inner side is wider than the opening, but due to the elastic force of the cover 4, it is possible to form a simple fitting structure between the groove 3 and the protrusion 5 as shown in Fig. 2. Also good.

Furthermore, as shown in FIG. 3, one side surface of the fitting groove 3 may be omitted.

In addition, as illustrated in each embodiment, the hard core 2
A space S may be formed between the upper surface 2B of the cover 4 and the inner surface of the covering 4, and legs 4B for holding this space may be integrally formed to protrude from the inner surface of the covering 4.

In this case, cushioning properties can be imparted to the upper end surface of the curb stone 1, which is convenient for safety, and the hard core bar 2 is
When joining the covering body 4 made of rubber-like elastic material, the contact area is small and the frictional resistance is small, so the fitting operation is easy and convenient.

In addition, in any embodiment, 6 in the figure is
These are foundation legs for fixing the hard core body 2 to the ground surface.

<Function> The covering body 4 forming the outer surface of the curbstone has the fitting protrusions 5, 5 on the inner surface connected to both fitting grooves 3, 5 on the side surface of the hard core body 2,
3 and supported on both sides, it will not easily fall off even if an external force is applied from the sides.

<Effect> Since this idea is structured as above,
It has the following effects.

The covering covers the outer surface of the hard core on three sides, and is engaged and fixed by the fitting grooves and protrusions formed on the inner surface of the covering, so that the engagement can be performed reliably.
Does not fall off easily. On the other hand, when extending or removing, it is sufficient to apply force in the direction of pushing the protrusion into the fitting groove or pulling it out, and the replacement work can be easily performed.

Since the cross-sectional shape of the hard core is symmetrical, when manufacturing a curved core along a curve, especially when extrusion molding is used, the stress distribution is even and deformation is less likely to occur, making molding very easy. Not only that, but also the dimensional accuracy is improved.

[Brief explanation of drawings]

Figure 1 is a sectional view of an embodiment of this invention, Figure 2 is a cross-sectional view of an embodiment of this invention;
FIG. 3 is a sectional view of another embodiment, and FIGS. 4 and 5 are sectional views of a conventional example.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A hard core body having fitting grooves on both sides and having a symmetrical cross-sectional shape, and surrounding the hard core body on both sides and three sides of the top surface. A curbstone for an athletics stadium, comprising a rubber-like elastic material covering member having an inner surface formed with fitting protrusions that removably fit into the fitting grooves. (2) A space is formed between the upper surface of the hard core and the inner surface of the covering made of rubber-like elastic material, and a leg whose lower end is in contact with the upper surface of the hard core is provided on the upper surface of the inner surface of the covering made of rubber-like elastic material. A curb for an athletics stadium as set forth in claim 1 of the utility model registration claim, which has an integrally protruding body.