The inclined shaft skip buckets are divided into two types according to the unloading method: front unloading and rear unloading.

Coal mines widely use rear-discharging hopper cars. They consist of a hopper box, walking wheel assembly, sector gate, and traction connection device. The structural features include two different gauge tracks for the front wheels, with a stepped tread. During unloading, the front wheels enter the straight track with a wide gauge, while the rear wheels enter the curved track with a standard gauge, causing the hopper car to tilt backward at an angle of 50° to 55° relative to the horizontal plane. The sector gate opens with the help of the curved track to discharge coal. The hopper car has a simple structure and good stability.

Front-discharging type is commonly used in the initial stage of inclined shaft construction, mainly responsible for assisting in slag and gangue removal as well as material transportation. It can also be used directly for ore extraction later. The features of this bucket are its simpler structure, smaller gauge, and standard specifications typically include 600mm and 900mm.