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

Image Number 4 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
Systems and methods for an online credit derivative trading system
Circuit board, method of manufacturing the same, and resistance element
Determining meeting attendee readiness
Positioning network availability and reliability based routing
Semiconductor device having metal gate and manufacturing method thereof
Image display device and method for displaying an image
Control layer indexed playback
  Randomly Featured Patents
Nanostructured multi-component and doped oxide powders and method of making same
Article comprising an optional waveguide tap
Two-photon or higher-order absorbing optical materials and methods of use
High energy loss disk stack testing apparatus
Futuristic Christmas ornament
Breathing assistance apparatus
Anti-tampering devices for bottles
Systems and methods for transmitting radio link control (RLC) data blocks
Process for welding cast iron
Adjustable/non-adjustable precision optical mounts