Patent ID: 7540052

Claim:
A method of propelling a pool cleaner of the pressure kind over a submerged surface, the method including pumping water in a flow stream to a pool cleaner head; converting energy of the pumped flow stream into mechanical energy associated with torque and applying said torque to at least one drive wheel, mounted to the head about a lateral wheel axis, to propel the head in a forward direction; directing a portion of the pumped flow stream via a thrust nozzle mounted on the head in a jet stream generally along a first jet stream line to generate thrust generally along a first thrust line co-incident with said first jet stream line and in opposite direction; in response to the head being checked against an obstacle transverse to said submerged surface, redirecting the jet stream along a second jet stream line to redirect thrust along a second thrust line co-incident with said second jet stream line and in opposite direction thereto, such as to cause the head to rotate about said lateral wheel axis relative to the submerged surface.