Swimming pool pressure cleaner with internal steering mechanism

In a swimming pool pressure cleaner of the type motivated by water flow through it to move along a pool surface to be cleaned, the improvement comprising:

• a body having a front, a rear and opposite sides;
• a set of two wheels rotatably mounted to the body, one on each side;
• a turbine housing secured to the body and having a water-flow chamber formed by a chamber wall, the chamber having an inlet and an outlet, the inlet being supported in close proximity to the pool surface;
• a turbine rotor rotatably mounted in the chamber, the rotor having vanes;
• at least one venturi jet secured to the body and oriented to direct water into the inlet to rotate the turbine and cause flow from the pool into the inlet;
• water conduits to transmit water from a hose to the at least one venturi jet;
• a drive member secured to the rotor and rotatable therewith;
• a drive train from the drive member to the wheels for synchronous rotation thereof on the pool surface;
• a cam having portions of greater and lesser radii, the cam being rotatably secured to the body and driven by the rotor through reduction gearing;
• and
• a linkage from the cam to one of the wheels to periodically interrupt the synchronous rotation of the wheels on the pool surface, thereby to change the direction of the pool cleaner.