Patent ID: 7172044

Claim:
A wheel board comprising a central wheel ( 2 ) with a diameter ranging from 0.2 to 0.6 m mounted on a free wheel ( 21 ), said central wheel ( 2 ) being mounted on an axle ( 3 ) situated on a vertically pivoting first arm ( 4 ) (hereafter the first arm) arranged on the board ( 1 ), said central wheel ( 2 ) being mounted freewheeling and being driven by a driving drum ( 17 ) around which is wound a band ( 11 ) that is fixed to said driving drum ( 17 ) by a first end and that is connected to the board by its second end, said driving drum ( 17 ) being equipped with a return device ( 19 ) so that, when the board ( 1 ) is not loaded, the central wheel ( 2 ) is in a lower position relative to said board ( 1 ) and said band ( 11 ) is wound around the drum ( 17 ) for driving the wheel.