Patent ID: 8448654

Claim:
A rotary spray device comprising: a base; a water inlet; a rotary assembly connected to the base for rotation about an axis; said assembly further including a first pair of diametrically opposite spray arms extending radially from the assembly and connected to said inlet, each arm having a nozzle outlet at the distal end thereof to emit water generally toward a target but angled enough to provide a first reaction force tending to rotate the assembly in a first direction; and at least a second set of diametrically opposite spray arms extending from the assembly and connected to said water inlet, each arm a having nozzle outlet at the distal end thereof to emit water generally toward said target but angled enough to provide a second reaction force tending to rotate the assembly in a second direction which is opposite to the first direction, the arms in the first set being longer than the arms in the second set whereby the first reaction force is greater than the second reaction force.