JP3343102B2 - Iron lid with anti-slip function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron cover having an anti-slip function, and more particularly, to an iron cover in which both a picture projection and a non-slip projection are formed on the top face of an iron cover, and a picture which is visually recognizable. The present invention relates to an iron lid that can be easily identified.

[0002]

2. Description of the Related Art As an iron cover for opening and closing a manhole leading to a pit for water and sewage, electric power, communication equipment, etc., a building, a flower, a tree, etc., representing a city or the like in which the iron cover is installed, is formed by a picture projection. In recent years, it has been gaining in popularity as an iron lid that is visually superior to an iron lid in which an iron lid shown on the surface is used and has a uniform pattern.

[0003] However, in the iron cover in which such a pattern is displayed, the area of the top of one of the pattern projections constituting the pattern may be large depending on the pattern. As described above, when the upper area of one of the picture projections is increased, the possibility of causing a car slip accident increases particularly in rainy weather.

[0004]

SUMMARY OF THE INVENTION
There has been a demand for the development of an iron lid having a non-slip function on an iron lid on which a picture is displayed, but such an iron lid has not yet been proposed.

Therefore, as a result of intensive efforts to obtain the above-mentioned iron cover, the present invention and the like have found that if an anti-slip projection is formed on the iron cover on which the pattern is displayed, the iron cover on which the pattern is displayed can be formed. In order to solve the problem that it is difficult to identify the pattern visually by forming a non-slip projection on the iron lid on which the pattern can be provided, and It has been found that the surface other than the constituent picture projections, that is, the reference bottom surface may be formed with irregularities.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an iron lid having an anti-slip function and displaying a visually recognizable pattern.

[0007]

According to the first aspect of the present invention,
It includes a pattern projection that protrudes with respect to the reference bottom surface of Tetsufuta top, and a number dispersed projection for projecting from the slip on the upper surface of the reference bottom surface and the pattern projection, the sliding
The locking projection is composed of a main projection and a sub-projection.
Height from the reference bottom surface (L1), in front of the sub-projection
The height (L2) from the reference bottom surface and the pattern projection
Between the height (L3) from the reference bottom surface, L1> L2
> L3, among the main projections and the sub-projections.
At least the main projection is divided by a vertical slit.
The reference bottom, the reference bottom and the picture projections
It is characterized in that it is formed in irregularities in order to identify the boundary of .

According to a second aspect of the present invention, the unevenness is plural.
The book's identification ridges are formed in close contact and parallel.
It is characterized by having

According to a third aspect of the present invention, the unevenness is plural.
The identification projections are formed in a distributed manner.
That are those particular with the features.

[0010]

[0011]

[0012]

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an iron cover having a non-slip function according to the present invention will be described with reference to the drawings.

FIG. 1 is a partial plan view showing an iron cover according to the first aspect of the present invention, FIG. 2 is a front view showing a non-slip projection divided by a vertical slit, and FIG. 3 is divided by a vertical slit. FIG. 4 is a plan view showing the anti-slip projection, FIG. 4 is a front view showing the anti-slip projection formed in a step shape, FIG. 5 is a cross-sectional view taken along line AA of FIG. 1, and FIG. FIG. 7 is a partial plan view showing the iron lid of the invention, FIG. 7 is a sectional view taken along line AA of FIG. 6, and FIG.
Is a plan view showing a concavo-convex pattern, FIG. 9 is a sectional view taken along line AA of FIG. 8, FIG. 10 is a plan view showing another concavo-convex pattern, FIG.
FIG. 11 is a sectional view taken along line AA of FIG. 10.

1 to 11, reference numeral 1 denotes an iron cover, 2
Is a reference bottom of the upper surface of the iron lid 1, and 3 is a picture projection formed so as to protrude from the reference bottom 2, and in this example, the picture projection is shaped like a lily flower. Have been. Reference numeral 4 denotes a non-slip columnar projection formed in a large number on the reference bottom surface 2 and the upper surface of the picture projection 3.

As described above, since a large number of projections 4 are formed dispersedly on the reference bottom surface 2 and the upper surface of the picture projection 3,
Even when the upper area of one picture projection 3 is large, the frictional resistance between the tire of the car and the iron lid 1 increases, so that the slip can be reduced.

As shown in FIGS. 2 and 3, if the anti-slip projection 4 is divided into a plurality of sections by the longitudinal slits S, the number of corners of the projection 4 increases, and the frictional resistance increases accordingly.

Further, as shown in FIG. 4, if the anti-slip projection 4 is formed in a tapered step shape, the side resistance of the projection 4 increases, and in particular, the friction resistance with the tire of the motorcycle increases.

As shown in FIGS. 5 and 6, the anti-slip projection 4 is composed of a main projection 4A and a sub-projection 4B, and the height (L1) of the main projection 4A from the reference bottom surface 2 is determined by the sub-projection 4.
If the height B is higher than the height (L2) from the reference bottom surface 2, the main protrusion 4A wears first and then the sub-projection 4B
Wear, the life of the anti-slip effect of the anti-slip projections 4 is extended. The height (L) of the pattern projection 3 from the reference bottom surface 2
3) is formed lower than (L2). That is, L1
, L2 and L3, a relationship of L1>L2> L3 is provided. Also in this case, at least the main projection 4A may be divided by the vertical slit S for the purpose of increasing the frictional resistance, and at least the main projection 4A may be formed in a tapered step shape for the purpose of increasing the side resistance. Is also good.

In the iron cover on which the picture is displayed, the picture is
Although visually recognized by the boundary line, as described above, when a large number of anti-slip projections are dispersed on the iron lid upper surface,
The border of the picture becomes unclear, making it difficult to visually identify the picture.

Therefore, as shown in FIGS. 8 and 9, a plurality of identification ridges 5 having a mountain-shaped cross section are formed in close contact with and parallel to the reference bottom surface 2 so that the reference bottom surface 2 is made uneven. Since the stripe pattern is formed on the bottom surface 2, the boundary between the reference bottom surface 2 and the picture projection 3 becomes clear. This solves the problem that the picture is difficult to identify visually.

As another means for making the reference bottom surface 2 uneven,
As shown in FIGS. 10 and 11, a plurality of identification protrusions 6 may be formed in a distributed manner. The shape of the protrusion 6 may be a columnar shape other than the prismatic shape as in this example. In this case, since the lattice pattern is formed on the reference bottom surface 2, the boundary between the reference bottom surface 2 and the picture projection 3 becomes clear. This solves the problem that the picture is difficult to identify visually.

[0023]

As described above, according to the present invention, the following useful effects can be obtained. By dispersing and projecting a large number of non-slip projections on the reference bottom surface and the top surface of the picture projection, even if the area of one picture projection is large, an excellent anti-slip effect can be obtained. Can be. By forming the reference bottom surface with irregularities and dispersingly forming the anti-slip projections on the iron cover on which the picture is displayed, it is possible to solve the problem that the picture is difficult to identify visually. Since the number of corners of the protrusion is increased by dividing the anti-slip protrusion into a plurality of parts by the vertical slit, the frictional resistance can be increased accordingly. By forming the anti-slip projection in a tapered step shape, the side resistance of the projection increases, so that the friction resistance with the tire of the motorcycle can be particularly increased. If the anti-slip projection is composed of the main projection and the sub-projection, and the height of the main projection from the reference bottom surface is higher than the height of the sub-projection from the reference bottom surface, the main projection will wear in advance. Then, since the sub-projections are worn, the life of the anti-slip effect of the anti-slip projections can be extended.

[Brief description of the drawings]

FIG. 1 is a partial plan view showing an iron cover according to the first embodiment of the present invention.

FIG. 2 is a front view showing a non-slip projection divided by a vertical slit.

FIG. 3 is a plan view showing a non-slip projection divided by a vertical slit.

FIG. 4 is a front view showing a non-slip projection formed in a step shape.

FIG. 5 is a sectional view taken along line AA of FIG. 1;

FIG. 6 is a partial plan view showing an iron cover according to the invention of claim 5;

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a plan view showing a concavo-convex pattern.

FIG. 9 is a sectional view taken along line AA of FIG. 8;

FIG. 10 is a plan view showing another uneven pattern.

FIG. 11 is a sectional view taken along line AA of FIG. 10;

[Explanation of symbols]

 1: Iron cover 2: Reference surface 3: Picture projection 4: Anti-slip projection 4A: Main projection 4B: Secondary projection 5: Identification ridge 6: Identification projection

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-10-96244 (JP, A) JP-A-2000-144779 (JP, A) JP-A-2000-199235 (JP, A) JP-A 2001-32310 (JP, A) , A) Japanese Utility Model Showa 59-77512 (JP, U) Japanese Utility Model Showa 63-95751 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 29/14

Claims (3)

(57) [Claims] 1. An image projection formed so as to protrude from a reference bottom surface of an upper surface of an iron cover, and a plurality of anti-slip projections dispersedly provided on the reference bottom surface and the upper surface of the pattern projection. Wherein the anti-slip projections comprise a main projection and a sub-projection.
And a height (L1) of the main projection from the reference bottom surface,
Height (L2) of the sub-projection from the reference bottom surface and front
Between the height (L3) of the picture projection from the reference bottom surface
Have a relationship of L1>L2> L3, and the main protrusion and
At least the main projection of the sub-projections is a vertical slit.
And the reference bottom surface is in front of the reference bottom surface.
Unevenness is used to identify the boundary with the picture projection.
Is characterized in that has, Tetsufuta having a slip function. 2. A plurality of identification ridges are in close contact with the irregularities.
The iron cover with a non-slip function according to claim 1, wherein the iron cover is formed in parallel . 3. The unevenness includes a plurality of identification protrusions dispersed.
Characterized by being formed by
An iron cover having a non-slip function according to claim 1.