JPS6335336B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention belongs to the field of press forming of rolled steel plates,
The molded article relates to treads used to prevent slipping on snowy or muddy areas. Such treads are used for ski resort lift landings or support scaffolding,
It is used for gangplanks, gutter covers, etc. at construction sites.

〔the purpose〕

It is an object of the present invention to improve the structure of the tread surface of this kind of treadle board described above, to improve its anti-slip function, and to make its manufacture simple and inexpensive.

Typical conventional treads of this type are, for example, Japanese Patent Publication No. 51-46335, Japanese Utility Model Publication No. 52-3865,
The footboards or lining boards disclosed in Publication of Utility Model Publication No. 52-3866, etc., all have a lattice-like structure made up of fine crosspieces, and the top surface has a flat outlook and the lattice has no direction. In addition to the drawbacks such as the anti-slip effect weakening in the grid direction and clogging quickly, the vertical and horizontal bars of the grid must be welded at multiple locations, which is very time-consuming. I need it.

〔composition〕

First of all, a tread plate manufactured using the present invention has a shape as shown in FIG. 1, for example, when completed. 1st
The tread 1 shown in the figure can be used alone, but in this case, a plurality of treads are used as a unit to create a wider foothold. The structure of the present invention is applied to the formation of the tread surface 2 of such a unit body. The illustrated unit 1 has a shallow box shape with front and rear walls 3, 4 and both side walls 5, 6.

Now, the tread 2 is manufactured as follows.

Thin plate 7 (for example, JIS
Ridge lines 8 (axis lines of the ridge portions) and trough lines 9 (axis lines of the trough portions) are set alternately at equal or arbitrary intervals on the G3131 general structural hot rolled thin plate.

A certain length of cut 1 along the ridge line 8 and valley line 9
0 and 11 are formed at equal intervals. Ridge cut 10
As shown in the figure, they are arranged in a staggered manner so that they are not lined up with the notches 11 in the valley.

Next, by pressing, the ridge lines 8 are pushed up from below and the valley lines 9 are pushed down from above to form ridges 12 and valleys 13 as shown in FIGS. 3 and 4. At the same time, the cut 10 is pushed open from below to the top to become a lip-shaped ridged hole 14, and the cut 11 is pushed open from above to the bottom to become a lip-shaped valley hole 15. The shape of these lip-shaped openings 14, 15 is shown in detail in FIG.

However, in FIG. 4, a small protrusion 16 is provided on the upper edge of the ridge opening 14.

That is, in the present invention, the tread 2 is formed all at once using a press after cutting is provided in a thin plate of material.

〔Example〕

As shown in FIG. 3, when pressing to form the tread 2, it is natural to form unnecessary parts of the thin plate and connecting holes at the same time, and as already mentioned, the openings 14, 15, it is preferable to arrange small protrusions 16 on the upper edges of the ridge holes 14 on the upper surface in order to prevent slippage. The ivy cuts 10 are formed in a gentle sawtooth shape as shown in FIG.

In addition to the above-mentioned rolled steel plate, a hard synthetic resin or the like may be used as the material for the thin plate.

[Function and effect] After cutting the thin plate, the ridges and valleys, the ridge openings, and the valley openings are formed all at once using a press.
The process is extremely simple and does not require assembling lattice bars or detailed welding as in the past, and can be manufactured at low cost.

Since the product is basically a so-called corrugated plate with alternating ridges and valleys on the tread surface, it has high bending resistance, and as shown in Fig. 4, the upper edge of the ridged hole 14 is pushed open from below. It protrudes from the top of the upper ridge 12 formed to further enhance the anti-slip effect.

That is, the tread 2 constructed according to the present invention has excellent unevenness that changes sharply in perspective and has no directionality.

When openings are formed by stretching as in expanded metal, complex stresses such as torsion and tension are concentrated at the intersections of the mesh, and the whole becomes a flat plate, which has low bending resistance.However, in the present invention, openings are formed by pressing. Since the holes are formed by pressing open, and the ridges and valleys are formed with a tendency to compress, stress is appropriately dispersed and the bending resistance is high.

[Brief explanation of drawings]

Fig. 1 is a perspective view illustrating the product, Fig. 2 is a plan view, Fig. 3 is a perspective view showing a part after pressing, and Fig. 4 is a perspective view illustrating the product.
The figure is an enlarged perspective view of a part of the product, and Figure 5 is a diagram illustrating the shape of the notch.
... Valley line, 14... Ridge opening, 15... Valley opening, 16... Small protrusion.

Claims (1)

[Scope of Claims] 1. Ridge lines and valley lines are set alternately at locations that will become the treads of a thin material plate, and along these lines, ridge cuts and valley cuts of a certain length are made at equal intervals, and both types of openings are made. After making the holes so that they are uneven, the ridge lines are pushed up from below using a press to form ridges, the ridge notches are pushed open from below to create lip-shaped ridge openings, and the valley lines are pushed down from above. A method for manufacturing a tread board characterized by forming a valley hole and simultaneously forming a valley hole by pushing open the valley notch from above in a lip-like manner. 2. The method for manufacturing a treadboard according to claim 1, wherein the notches for forming the ridge holes have a gentle sawtooth shape. 3. The method for manufacturing a treadboard according to claim 1, wherein the thin material plate is a rolled steel plate or a hard synthetic resin plate.