Abstract: Self-propelled underwater electromechanical apparatus for cleaning the bottom and the walls of swimming pools, having an electric motor which operates a propeller turbine for circulating the water and a driving unit for transmitting movement to a roller travel system. The electric motor and the driving unit are made with an open structure in which the swimming-pool water freely circulates. The electric motor is of the brushless type and both the winding of its rotor and that of its stator are embedded in an impermeable resin. The driving unit has a reduction unit with an output shaft operating two roller travel systems mounted on opposite sides of the apparatus. Devices for achieving reversal of movement consisting of a shaft extension oscillating between two different working positions, are arranged between the output shaft and the two travel systems.

Abstract: An automatic, self-propelled cleaner comprises a hydraulic turbine motor for driving two oppositely located wheel Locomotion members and at least one cam driven by the motor and associated with one of the wheel locomotion members to temporarily riase it while the other of the wheel Locomotion members is held engaged, thereby the travel direction of the cleaner can be changed.