Flexible hose automatic winding device

A flexible hose automatic winding device comprising a winding drum for the flexible hose, said drum having a shaft formed by a tubular element connected through a rotary sealing gasket to a supply-pipe of a liquid to be dispensed by the flexible hose, and biasing means urging said drum in rotation in the direction in which the flexible hose is wound, said biasing means exerting a torque on said drum maintaining the flexible hose under a tension just sufficient to prevent the flexible hose from coming in contact with the ground, wherein said biasing means comprises a pulley rigidly connected to said drum, a cable wound on said pulley in a direction opposite to the direction of winding of the flexible hose, and means exerting a progressive pulling force on the end of said cable for applying to said pulley a progressively increasing torque as a function of the amount of unwinding of the flexible hose from said drum.