Why Can The Trolley in The Supermarket Get Stuck On The Elevator And Not Fall Off?

The steps have protruding teeth and concave tooth slots. The wheel of the trolley is also designed to be grooved, which just fits with the step slots and gets stuck on it. When it comes to the exit, it sinks into the groove of the step. The wheel is just pushed up by the comb teeth of the comb plate, and then the trolley can get off the steps and leave the escalator, and walk normally.

Extended information

Because there are grooves on it, and the wheels of the trolley have protrusions, then the depth of the grooves is greater than the height of the protrusions on the wheels, and the cutting width is also larger than the latter, and because there are rubbers on both sides of the wheels for brakes, in conclusion, the trolley is It is suspended on the elevator, and only the rubber is in contact with the elevator as a brake, so when the elevator stops moving, the trolley cannot be pushed.

When the trolley is about to reach the end of the escalator, the person should take one step ahead of the trolley, and then when the trolley goes down the escalator, pull a trolley diagonally upward to ensure that the trolley can be released from the slot gap of the escalator track in time and safely.

This design allows users to have time to regret when the rear wheel is not stuck when pushing the shopping cart to the elevator. And when you have to move the shopping cart, you can directly lift the back shopping wheel and pull it away relatively easily.