What are the related introductions of the trolley case?

A trolley case refers to a luggage case with a trolley and rollers. It is widely used because of its convenience. At the same time, the trolley box is also equipped with a trolley because of the box. There are single-tube trolleys and double-tube trolleys. The trolley tubes are also divided into square tubes and round tubes to facilitate dragging when walking and greatly reduce the burden. The trolley box can be hand-carried or dragged.

The wheels of the trolley box we usually use are basically located at the bottom of the box, but modern people have designed a new form of trolley box, the box is designed into a cylindrical shape, and the wheels are The whole package is outside the box. This roller design makes this trolley box better adapt to different terrains. For example, you can easily go up and down the stairs by pulling the box directly. In 2012, cloth cases, ABS hard cases, leather cases, PC, etc. were used as the main materials, and the usability was divided into three categories: directional wheels, universal wheels and the latest detachable universal wheel trolley cases.