JPS60203326A - Production of step board - Google Patents

Abstract

PURPOSE:To elevate a slip prevention function of a step board and to simplify the production by providing notches equidistantly and obliquely along the reciprocal ridge line and root line of the part serving as the stepping face of a thin plate and opening the cut by pushing up and down the ridge line and root line. CONSTITUTION:A ridge line 8 and root line 9 are provided reciprocally at equal distances or optional distances on a thin plate 7 of the material of a unit body 1 and notches 10, 11 in specific length are formed equidistantly along these, which are arranged obliquely not to be ranked with the notches 10, 11. Then a line 8 is pushed up, the line 9 is pushed up by stamping, and the ridge 12 and root 13 are formed. At the same time the notches 10, 11 are respectively opened upwards and downwards to be made a lip-shaped ridge opening 14 and root opening 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Special Issues] This invention belongs to the field of press forming of rolled steel plates, and the article to be formed relates to treads used to prevent slipping on snowy or muddy areas. Such treads are used as scaffolding for ski resorts, on ski slopes, and as gangplanks and ditch covers 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.

A typical conventional tread of this kind is, for example, the equity 115.
1-4f 1885, Utility Model Publication No. 52-8865, Utility Model Publication No. 52-8866, etc., are footboards or sideboards disclosed, but all of these are lattice-shaped boards that combine narrow crosspieces. Because the top surface is flat and the lattice is directional, the anti-slip effect is weakened in the direction of the lattice, and it easily gets clogged. This requires welding at multiple locations, which is extremely time-consuming.

〔composition〕

First of all, a tread plate manufactured using the present invention has a shape as shown in FIG. 1, for example, when completed. The step board 1 shown in FIG. 1 can be used alone, but in this case, a plurality of steps are used as a unit to create a wider platform. 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 β, 4 and both side walls 5, 6.

Now, the tread iitjg is manufactured as follows.

■ A thin plate that is the material of unit l? (For example, J Engineering S
G 8181 - Hot rolled thin plate for membrane structure) with ridges 11A8
(axis line of the part that will become a ridge) and valley line 9 (axis line of a part that will become a valley) are alternately set at equal or arbitrary intervals.

■ 1 constant length cut 1O1 along the ridge fil&, valley me
11 are formed with equal spacing. The ridge notches 10 and the valley notches 11 are arranged in a staggered manner as shown in the figure so that they are not lined up.

(2) Then, using a press, the ridges 8 are pushed up from below and the valley lines 9 are pushed down from above to form ridges 12 and valleys 18 as shown in FIG. 8.4. At the same time, the 1 degree cut is pushed open from below to the top to become a ridged hole 14 which is turned up in a lobe shape, and the cut 11 is pushed open from above to the bottom to become an orally shaped valley hole 15. These mouths,
The shape of the rib-shaped openings 14, 15 is detailed in FIG.

However, in FIG. 4, a small protrusion 16 is arranged on the upper edge of the ridge opening 14. That is, in the present invention, the tread 2 is formed all at once by a press after a cut is made in a thin plate of material.

〔Example〕

As shown in FIG. 8, 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. It is preferable to arrange a small protrusion 16 on the upper edge of the ridge hole 14 on the upper surface of the ridge hole 15 in particular for the effect of preventing slipping.
The notches 10 along the line 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.

[action effect]

■ After making cuts in the thin plate, the ridges and valleys as well as the ridge openings and valley holes are formed all at once using a press, so the process is extremely simple and does not require assembling lattice bars, detailed welding, etc. as in the past. It can be manufactured at low cost.

■ The product is basically a so-called corrugated plate with alternating ridges and valleys on the tread surface, so it has high bending resistance.As shown in Figure 4, the upper edge of the ridge hole 14 can be pushed open from below. It protrudes from the top of the ridge 'i2 formed by this process, further enhancing 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 the case of exhaust band metal, complicated stresses such as torsion and tension are concentrated at the intersections of the mesh, and the whole becomes a flat plate with low bending resistance.However, in the present invention, by pressing, Form the hole by pressing it open,
In addition, since the ridges and valleys are formed with a tendency toward compression, stress is appropriately dispersed and bending resistance is high.

[Brief explanation of the drawing]

Fig. 1 is a perspective view illustrating the product Fig. 2 is a plan view Fig. 8 is a perspective view showing two parts after pressing Fig. 4 is an enlarged perspective view of a part of the product Fig. 5 is a view of the notch Figure 1 illustrating the shape: tread (unit body) 2: tread 8: ridge line
9... Valley line 14... Ridge opening 15... Valley hole 16... Small protrusion Figure 5 Figure 2 Figure j

Claims (3)

[Claims] (1) Set ridge lines and valley lines alternately at the locations that will become the treads of the thin material plate, and make ridge cuts and valley cuts of a certain length at equal intervals along these lines, and make sure that both types of holes are arranged at different intervals. After the ridge line is pressed up from below using a press to form a ridge, the ridge notch is pushed open from below to form a groove-shaped ridge opening, and the valley line is pushed down from above to form a valley. The method for manufacturing a tread board is characterized in that the valley notch is pushed open from above in a 4-shaped opening to form the valley hole all at once. (2) The method for manufacturing a treadboard as set forth in claim 1, wherein the notches for forming the ridge holes have a gentle sawtooth shape. (3) The method for manufacturing a footboard or board according to claim 1, wherein the thin material plate is a rolled steel plate or a hard synthetic resin plate.