What happened when the elevator suddenly fell from the fourth floor to the third floor?

First, the maintenance work is not in place, and even some residential properties have basically given up the maintenance once every half a month in order to save money.

Second: the maintenance worker short-circuited some safety switches in violation of regulations.

Third: overload

Fourth: In most cases, the reported or rumored elevator fall is actually a function of the elevator, that is, when there are some minor faults in operation, the elevator automatically goes to the bottom to correct errors, which we call addressing. Generally, the elevator stops suddenly in the process of rising, and then drops to the ground floor. Ordinary laymen will not dare to think that the elevator will fall. In fact, many reports about elevators are inaccurate. For example, some time ago, someone reported pressing the button outside. As a result, the elevator is not on this floor and people fall off. This is impossible, because the outer door has no function of opening the door, and for safety, as long as the elevator is not on this floor, the door will automatically close and be locked with a hook. We think this is the case: at that time, someone was repairing the elevator, he opened the outside door, held it with something, and then drove the elevator to another place, causing an accident, that is to say, the elevator door was originally open, not pressing the button. This is the maintenance worker's violation of safety operation, not the elevator itself. Many reports are nonsense.