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
Analysis device and an analysis apparatus using the analysis device
Compact ion accelerator source
Grounding fitting
System and method to assess serviceability of device
System and method for generating profile morphing using cephalometric tracing data
Test framework of visual components in a multitenant database environment
  Randomly Featured Patents
Compositions and methods for prevention and treatment of diseases associated with honey bees
Indentations to control metal curling
Electrical activation of a viscous clutch
Motorcycle safety brake and running light for a jacket or vest
Drum pedal unit pedal position adjustment
Heat-Shrinkable EMI/RFI shielding material
Apparatus and method for measuring the time elapsed in increasing or in decreasing vehicle speed from one predetermined speed to a second, higher or lower predetermined speed
Method of reducing nitrogen oxides in a gas stream with vaporized ammonia
Thick-film resistor having concentric terminals and method therefor
Frame structure for buildings