Stair climbing three wheeled trolley

Ladder trolley

— a variation of the trolleys described above, designed for convenience when moving up stairs. A distinctive feature of such models is the specific design of the wheels: on each side there are not one, but three wheels installed in a triangle. While the cart is moving on level ground, it rests on each side on two of the three wheels; and when climbing or descending stairs, the entire triangular wheel block begins to rotate around its centre, and the wheels seem to “step over” the steps — this allows you to move the cart up the stairs with less effort than using traditional wheels. This feature slightly increases the cost of the trolley, but it can be indispensable for those who often have to deal with stairs a lot.