Double level trolley

A vehicle that carries and pulls manpower. It is the ancestor of all vehicles. Despite advances in material handling technology, trolleys are still used as an indispensable handling tool. Trolleys are widely used in production and life because of their low cost, simple maintenance, convenient operation and light weight. It can work in places where motor vehicles are not convenient to use, and it is very convenient to transport lighter items over short distances.

The cart has one wheel, two wheels, three wheels and four wheels. Wheelbarrows can be driven over narrow gangways, Bridges and small intestines. It can be moved into place and it is very convenient to dump the goods. Commonly used two-wheeled vehicles include a portable truck (also known as a tiger truck) that carries cargo, strollers and dump trucks carrying bulk materials. One of the three-wheeled carts had two rotating casters that could swing around a vertical axis. This type of rotating casters can be automatically adjusted to the direction of least resistance when the direction of movement of the vehicle changes during operation.