The specific origin has not been studied. Simply talk about the benefits of doing so. First, the jagged surface has greater friction than the smooth surface, which makes it easier for passengers to stand firm. There are other respondents mentioned that it is convenient to jam the wheels of the shopping cart.
Of course, shopping carts can only be pushed on flat moving walkways, and shopping carts cannot be pushed on stepped escalators. Then, in addition to the upper surface of the steps, the facade also has grooves, which can perfectly mesh with the adjacent steps. When it is convenient for step installation, find a straight line.
In the escalator installation specification, there is such a standard: "The gap between the side of the step and the apron shall not be greater than 4mm, and the sum of the gaps on both sides shall not be greater than 7mm." Imagine an escalator with dozens to hundreds of steps. It is troublesome to measure the gap on both sides during the installation step.
With a perfectly meshing groove, you only need to adjust the first step. When installing other steps, use the groove to align with the previous step. The world suddenly became better.
Of course, in the actual installation process, the grooves in the horizontal plane are used to find the steps, not the facade. The specific operation details do not need to be mentioned here.
In addition, answer, why the stripes are vertical. At the upper and lower ends of the escalator, there is a row of comb-shaped pedals, which go deep into the step grooves to remove foreign objects on the step pedals.
How to install the comb plate if it is arranged horizontally?
The function of the comb plate is not only to remove foreign matter on the surface of the steps, but also to lift up the shopping wheels stuck on the pedals, and soft-soled shoes that sink into the grooves of the step pedals. When a foreign object gets stuck in, the sensor behind the pedal will detect the horizontal displacement of the comb plate and trigger an emergency stop. Protect passengers and elevator equipment.
