JPH0357308Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) This invention relates to the structure of a non-slip plate.
More specifically, the present invention relates to the structure of a non-slip plate having a plurality of protrusions provided on a flat plate.

(Prior art) As a conventional non-slip plate with such a structure,
The most widely known type is so-called striped steel plate. Striped steel plates are produced by cutting concave grooves, which correspond to the desired protrusions, at regular intervals on the surface of a rolling roll for manufacturing steel plates, and then rolling them at regular intervals on the surface of the steel plate. The provided protrusions are raised, and the anti-slip plate manufactured through such a manufacturing process is naturally inexpensive and can be mass-produced. However, in the non-slip plate manufactured by such a method, it is impossible to form a sharp edge on the periphery of the protrusion due to the manufacturing process, and the periphery of the protrusion becomes a gentle shape. It is not very effective in preventing slipping and cannot be used safely in areas where dangerous work is involved.

On the other hand, one of the conventional anti-slip plates that has a remarkable anti-slip effect is one that has so-called barnacle-shaped protrusions. As shown in Fig. 6, a rolled, smooth steel plate 1 is punched using a mortar-shaped female die 2 and a corresponding male die 3 with a conical surface. The protrusion 4 is formed by processing, and the edge of the punched hole 5 bursts out into a saw-like shape. This anti-slip plate has the advantages of being relatively easy to process and can be processed freely at desired locations, and that the sharp protrusions at the explosion point have a significant anti-slip effect. However, a fatal drawback is that the intrusion of dust, water, etc. cannot be prevented due to the presence of the holes 7 as bursting tears. For example, if you want to install a floor made of anti-slip boards and want to prevent water or mud from getting on your shoes from getting under it, you cannot use this board.

Previously, the applicant filed a patent application No. 151989/1989 for "Slip stop plate and method for manufacturing the same".
This (hereinafter abbreviated as the existing application) was made in an attempt to solve the above-mentioned defects of the striped steel plate and the defects of the barnacle shape. To briefly describe the present situation, FIGS. 7 and 8 show an embodiment of the above-mentioned patent application, and 6 is a punch with a sharp edge formed on the periphery of the tip, and 7 is a punch that faces the punch 6. This is a die set up.

In FIG. 2, a punch 6 and a die 7 are respectively disposed on the front and back sides of a flat plate 8, and an external force F in the direction of the arrow is applied to the head of the punch 6 to produce plastic deformation on the flat plate 8 in the punching direction. By tightening,
Protrusions 9 are formed on the surface of the flat plate 8. The penetration depth of the punch 6 at this time is set to a depth that does not cause a crack that communicates the front and back sides of the flat plate due to the above-mentioned plastic deformation. In other words, the entry of the punch 6 is stopped at a point where no tear occurs in the flat plate.

As is clear from the process by which this plastic deformation occurs, it is not due to bending of the flat plate but due to shearing force. Therefore, the shape formed at the periphery of the tip of the protrusion 9 has a considerably sharper edge angle than that of the protrusion of the striped steel plate.

Furthermore, since there is no hole in the protrusion that penetrates the front and back sides like a barnacle, it is naturally possible to prevent water and dirt from falling and entering through the plate. In addition, FIG. 7 shows an example in which the ends of the flat plate 8 and the adjacent plate 10 are bent so that they face each other, and these parts are welded along the weld line 11 to form a continuous tread plate. . In this case, for example, with a steel plate on which protrusions are uniformly formed in advance, such as the conventional striped steel plate, it may not always be possible to make good contact between the bent parts for facing welding. In the case of a method in which processing is performed by selecting an arbitrary position on a flat plate, this point is also convenient.

However, in the above-mentioned existing application, especially in the non-slip plate manufactured based on the method disclosed in the application, the angle of the ridge corner around the tip of the protrusion is an obtuse angle exceeding 90° as the minimum value. As a result, there were problems with its use, especially for scaffolding boards used in dangerous work where slipping is strictly prohibited.

(Purpose of the invention) This invention is capable of forming an anti-slip device with an extremely high anti-slip effect at a desired location on a flat plate with a simple structure, and also provides a non-slip device that does not allow water or dust to pass through. This was done for the purpose of providing the structure of the board.

(Structure of the invention) To achieve this, this invention provides a protrusion at any location on a flat plate, forms a depression in the center of the surface of the protrusion to form an acute-angled peripheral edge of the protrusion, and A feature is that there is no hole penetrating the front and back sides in the part.

(Example) Next, an example of this device will be described in detail with reference to the drawings. 1, 2, and 3 all show the structures of the protrusions in different embodiments of the anti-slip plate according to this invention, and the protrusion 12 in FIG. 1 has a conical shape in the center of its surface. A recess 13 is formed, so that an acute tip 14 is formed continuous with the periphery of the protrusion. 15 is protrusion 1
This is a concave portion formed on the back surface during the punching process of No. 2.
The angle α of the tip 14 formed in this way is always an acute angle, so that the anti-slip effect is remarkable. Furthermore, no hole is provided between the depression 13 and the recess 15 that penetrates the front and back sides.

FIG. 2 shows an example in which a dish-shaped recess 17 is formed in the center of the surface of the protrusion 16, and in this case also, the angle α of the tip 18 is configured to be an acute angle.

FIG. 3 shows an example in which a concave lens-shaped recess 20 is provided in the center of the protrusion 19, and in this case, the angle α of the tip 21 is also configured to be an acute angle.

FIGS. 4 and 5 show a preferred example of the processing device for forming the protrusions of the present device, and show how to form the protrusions using this processing device.

In the figure, 22 is a flat plate as a raw material, 23 is a punch, 24 is a die, 25 is a spring,
26 is urethane as an elastic body having relatively high rigidity. When an external force F is applied to the guide 27 of the die 24 and the flat plate 22 and the punch guide 28 are pressed down against the spring 25 until the gap δ becomes zero, the protrusion 12 of a predetermined height is pushed against the flat plate 22. At the same time as the above is formed, a die 24 is pressed against the surface of the protrusion 12 through the urethane 26, and a depression 13 is formed in the center thereof.

(Effect of the invention) Since the anti-slip plate according to this invention is constructed as described above, it is possible to form an anti-slip device with an extremely high anti-slip effect at a desired location on a flat plate with a simple structure. This has the effect of providing a non-slip plate that does not allow water or dust to pass through.

[Brief explanation of drawings]

Figures 1, 2, and 3 are all sectional views of essential parts in different embodiments of the device of the present invention, and Figures 4 and 5 each show an example of the manufacturing process of the device of the present invention, each showing different operations. 6 is a sectional view showing an example of the conventional device, FIG. 7 is a perspective view showing another example of the conventional device, and FIG. 8 is a sectional view of the example shown in FIG. 12, 16, 19... protrusion, 13, 17, 20
...Indentation, 14, 18, 21...Tip, 15...
... recess, 22 ... flat plate, 23 ... punch, 24 ...
...Die, 25...Spring, 26...Urethane, 27,28...Guide.

Claims (1)

[Scope of utility model registration request] Protrusions are provided at arbitrary locations on a flat plate, and by forming a depression in the center of the surface of the protrusion, the periphery of the protrusion is configured to have an acute angle, and no hole is provided in the protrusion that penetrates the front and back sides. The structure of the anti-slip plate is characterized by: