Abstract: A movable support which includes a first axle, two stub axles which are in line with one another and which extend in opposing directions from the first axle at right angles thereto, and two hemispherical members which are mounted, with respective convex surfaces outermost, for independent rotation on the respective stub axles, on opposing sides of the first axle. The movable support finds particular application in supporting a cleaning head of a suction type pool cleaner.

Abstract: A swimming pool cleaner which has a head mounted on wheels, a suction passage through the head, a turbine which is mounted in the suction passage, and a propellor which is driven by the turbine and which propels the head. A rudder, which is oscillated via a gear train driven by the turbine, is used to vary the direction of movement of the head.

Abstract: Apparatus for use with a swimming pool cleaner which includes a housing which defines a chamber, at least one inlet to the chamber and an outlet from the chamber, and a bouyant ball inside the chamber. The apparatus is installed or incorporated in a weir. When suction is cyclically applied to the outlet, and removed, the ball alternately blocks the outlet, and leaves the outlet unblocked. Correspondingly the pool cleaner is operated to clean a submerged surface of a swimming pool, or water is drawn directly from the pool and through a weir, for filtration. A more efficient cleaning of the pool takes place.

Abstract: A swimming pool cleaner which has a housing to which suction is applied via a flexible hose. Water flow through the housing is used to drive a turbine which powers a propeller to cause movement of the housing. The buoyancy of the housing is adjusted by filling a chamber, of the housing, with water. The hose is permitted to rotate, and pivot, relatively to the housing to increase the mobility of the cleaner.