US Patent 6886205 Self-propelled running apparatus for cleaning an immersed surface

The invention concerns a self-propelled running apparatus for cleaning an immersed surface, comprising in combination a rigid transverse motor housing (1), two lateral flanges (6) rigidly fixed on either side of the motor housing (1) so as to form a rigid H-shaped frame (72), a front transverse wall (9) removably fixed to said frame (72), a rear transverse wall (10), a base (11) provided with water inlets (66) and a top hood (5) fixed to the frame (72) provided with a top orifice (4) for water evacuation, a unidirectional hydraulic circuit being provided from the inlets (66) between the transverse walls (9, 10), the motor housing (1) and the flanges (6), up to the top orifice (4) of the hood (5).