Why is the elevator in the supermarket holding the cart still?
You mean escalators? Because of cart wheels and cascade line not together, so don't follow it down, if in a line it will drop down, I'm in escalator debugging
Supermarkets elevator (slope) is called the pavement, standing above the person's name is pedal, each step panel by the strips along the direction of higher rod, at ordinary times we are standing on the rod, and the wheels of the cart is special, the wheels on both sides are prominent rod, on flat ground the car by rod rolling contact with the ground, the wheels on the height of the rod lower down in the middle position has a few fixed rubber (not on the spinning wheel), push the car to the pedal and the thorns into the groove of the pedal.
The pedals protruding from the wheels of the wheel are the ones that hold the wheels up and the wheels are suspended. So you're still standing still, I'm saying you're going to get to the scene
