US Patent 7770821 Irrigation sprinkler

An irrigation sprinkler provides a more even distribution pattern of water over a given area being irrigated by providing a controlled rotation in a wobbling water deflector. A sprinkler base has a nozzle attached thereto and a water deflector rotatably attached to the base. The water deflector and the nozzle each have a plurality of gear teeth thereon which gear teeth are different in number between the water deflector and the nozzle so that they only partially mesh when the water deflector is rotated on the base. The gear teeth also assure that the deflector cannot spin freely causing high rpm.