Resources Contact Us Home
Sprinkler with geared viscous hesitator and related method

Image Number 6 for United States Patent #7980488.

A rotary sprinkler includes: a shaft having a cam, the cam having a plurality of radially outwardly projecting cam lobes; a rotatable water distribution plate adapted to be impinged upon by a stream emitted from a nozzle causing at least the water distribution plate to rotate; a hesitator assembly including a stationary housing having a sealed chamber at least partially filled with a viscous fluid, with at least the cam and the cam lobes located within the chamber; a rotor ring located within the chamber in substantially surrounding relationship to the cam, the rotor ring loosely located within the chamber for rotation and translation, the rotor ring provided with at least two hesitator lobes projecting radially inwardly and movable laterally into and out of a path of rotation of the cam lobes, and a first plurality of radially outwardly projecting teeth selectively engageable with a second greater plurality of teeth provided on an inner wall of the housing; and wherein rotation of water distribution plate is slowed during intervals when one of the cam lobes engages and pushes past a respective one of the hesitator lobes, the cam lobe exerting both rotation and translation forces on the rotor ring, with one of the first plurality of teeth on the rotor engaging one of the second plurality of teeth on the housing wall.

  Recently Added Patents
Corner wrap for use with a pallet
Receiver and transmitter receiver system
Nitride semiconductor laser device
Sample analysis and/or sample processing system
Masking method and apparatus
Magnetic reading and writing device
Organic electroluminescent element
  Randomly Featured Patents
Solar ray collecting device for use in a spacecraft
Decorative trim assembly
Electro-osmotic displays and materials for making the same
Method and apparatus for supercritical ozone treatment of a substrate
Spool assembly for a dual bearing reel
Antenna sharing for wirelessly powered devices
High flow polyphenylene ether formulations with dendritic polymers
Rotary cutter for a wood planing machine
Surface mount placement system with single step, multiple place carriage
Etching process for forming damascene structure of the semiconductor