Patent ID: 8733672

Claim:
A magnetically driven irrigation sprinkler comprising: a sprinkler body having a longitudinal axis thereof and including a fluid inlet, a fluid outlet rotatable about the longitudinal axis relative to the fluid inlet, and a fluid flow path extending between the fluid inlet and the fluid outlet; an electrical generator mounted to the sprinkler body, the electrical generator arranged and configured to generate an electrical current from fluid flowing through the fluid flow path; a drive mechanism for rotating the fluid outlet relative to the fluid inlet, the drive mechanism including a permanently polarized magnet and an electromagnet coupled to the fluid outlet and in electrical communication with the electrical generator to be magnetically polarized thereby; and a magnetic coupling between the permanently polarized magnet and the electrically polarized electromagnet so that a magnetic force therebetween moves the electromagnet relative to the permanently polarized magnet to effect a rotation of the fluid outlet relative to the fluid inlet; and wherein the permanent magnet is provided with a worm gear arranged and configured to rotate transverse to the housing axis.