| 摘要 |
<p>The invention concerns a device to drive and control a working vehicle arranged for treatment of a surface (15) thereof. The vehicle comprises for this purpose a driving wheel assembly (1) and two tools (14, 23) arranged, by their rotary motion, to perform said treatment of said surface (15). The driving wheel assembly (1) is rotatable about its centre (22) and is orientated with respect to the tools (14, 23) in such a manner that the imaginary interconnecting lines (24, 25, 26) between the centres of rotation (27, 28) of the tools (14, 23) and between the centre of rotation (22) of the driving wheel assembly (1) and the centres of rotation (27, 28) of the respective tools (14, 23), form a triangle, preferably an equilateral triangle. The device comprises means (18, 19) which are provided to relieve the load of the working vehicle on the tool against the surface (15) at the centre of any one of the tools (14, 23) for allowing said vehicle to pivot about said centre (27, 28) upon turning movement of said driving assembly for the purpose of changing the direction of movement of said working vehicle.</p> |
