JPS6365590B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for welding steps of an escalator, and in particular to a method for welding a riser to a base fixed to a bracket so as not to spoil the aesthetic appearance of the riser surface. The present invention relates to a method of welding escalator steps suitable for

[Conventional technology]

FIG. 1 is a side view of the escalator step. The escalator step is composed of a cleat 1 that serves as a tread for passengers to directly ride on, a riser 2 that protects the toes of the passengers, a bracket 3 that supports the cleat 1 and riser 2, and rollers 4. It is spot welded to the base 5 which is fixed to the base 3. As the riser 2, a stainless steel plate or the like is bent into a corrugated shape to form a large number of irregularities, which has been used to improve safety and durability, and the base 5 that holds the riser 2 is also made of a steel plate. I am using it.

By the way, the conventional method of spot welding the riser 2 and base 5 is as shown in FIG.
Rod-shaped electrodes 10 and 11 having the same circular arc and small tips were applied to the corrugated troughs 2B of the riser 2 and the base 3, respectively, and spot welded.

[Problem that the invention seeks to solve]

However, according to such a spot welding method, when the riser 2 and the base 5 are pressurized by the electrodes 10 and 11 during spot welding,
Indentations remain in the spot welded portions of the troughs 2B of the riser 2, resulting in a problem of deterioration of the aesthetic appearance. In addition, since the riser 2 and base 5 that are in contact with each other are locally pressed together only at the spot welded portions, for example, the upper part of the riser 2 may be deformed as shown by the two-dot chain line, and a gap may be created at part A. There were also problems.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, so that no indentations are formed on the surface of the riser when the riser and the base are welded, and no gap is formed between the riser and the base after welding. The object of the present invention is to provide a method of welding escalator steps that can be used in a similar manner.

[Means for solving problems]

In order to achieve the above object, the present invention, when performing spot welding, makes the welded part of the base of the plate thicker than the riser non-contact with the riser, makes the upper and lower parts of the welded part contact the riser, and The tip of a rod-shaped electrode is applied to the back surface of the welded part of the base, and a rectangular electrode that is curved vertically along the curve of the riser and has an electrode surface longer in the vertical direction than the tip of the rod-shaped electrode is applied to the recess of the riser. After that, the welded portion of the base is brought into contact with the riser and welded.

〔Example〕

The present invention will be described in detail below with reference to the embodiments shown in FIGS. 3 and 4 and FIG. 5.

FIG. 3 is a side view of the main part showing an embodiment of the escalator step welding method of the present invention, and shows the riser 2
The step is shown welded to the base 5, and the overall configuration of the step is the same as that shown in FIG.
The base 5 is a thicker plate than the riser 2, and the part to be spot welded to the riser 2 is a plane 5P as shown in the figure. A gap G is left open with no contact.

In addition, in the embodiment of the present invention, when the riser 2 and the base 5 are fixed by spot welding, the electrode applied to the riser 2 has an electrode surface with the same curvature as the riser 2, and has a normal rod shape. It is a rectangular electrode 12 that is longer in the vertical direction than the tip of the electrode 11, and is placed against the trough 2B of the riser 2 formed by bending a stainless steel plate or the like into a corrugated shape. The electrode applied to the base 5 was a rod-shaped electrode 11 with a small arc at the tip, as in the conventional case.

Therefore, before welding, there is a slight gap G between the welded part a of the riser 2 and the base 5, but during welding, since both electrodes 11 and 12 are pressed together, as shown in FIG. Then, the portion 5a of the base 5 pressed by the electrode 11 protrudes toward the riser 2, and this protrusion 5a contacts the riser 2, and in this state, electricity is applied and welding occurs.

As a result, after welding, the riser 2 and the base 5 come into contact at three points: the welded part a, the upper part b, and the lower part c, and the pressing force acting on these three points is applied to the gap ( (See part A in Figure 2). Further, since the rectangular shape of the electrode on the riser 2 side is matched to the curvature of the riser 2 as the electrode 12, no impression is left on the spot welded portion on the surface of the riser 2, and the appearance is not spoiled.

〔Effect of the invention〕

As explained above, according to the present invention, no indentations are formed on the surface of the riser when welding the riser and the base, and there is no gap between the riser and the base after welding, and the riser It has the effect of improving aesthetic appearance.

[Brief explanation of drawings]

Figure 1 is a side view of the escalator steps;
Fig. 2 is an explanatory diagram of a method of welding the riser and base of a conventional step, and Fig. 3 is a side view of essential parts showing a state in which a riser is welded to a base, showing an embodiment of the escalator step of the present invention. , FIG. 4 is a view seen from direction B in FIG. 3, and FIG. 5 is an explanatory diagram of the state of the base when the riser and base in FIG. 3 are welded together. 1... Cleat, 2... Riser, 3... Bracket, 4... Roller, 5... Base, 11...
Rod-shaped electrode, 12... rectangular electrode.

Claims (1)

[Claims] 1 A cleat formed by bending a steel plate into a corrugated shape to form a large number of unevenness, a riser curved by arranging the unevenness vertically and elongated, and a bracket supporting the cleat and riser, In a welding method for an escalator step, the base plate is fixed to the bracket on the inside and is thicker than the riser, and is joined by spot welding, in which the welded part of the base is not brought into contact with the riser when performing the spot welding. The upper and lower parts of the welded part are brought into contact with the riser, and the tip of a rod-shaped electrode is applied to the back surface of the welded part of the base, and the curved part of the riser is placed in the concave part of the riser facing the welded part of the base. A rectangular electrode is applied that is curved in the vertical direction along the vertical direction and has an electrode surface that is longer in the vertical direction than the tip of the rod-shaped electrode, and then the rod-shaped electrode and the rectangular electrode are pressed together to connect the welded portion of the base to the riser. A method for welding an escalator step, characterized in that the welding is performed by pressing the step into contact with the escalator step.