Site Search:











Contact Us

DoD TTIPT

Login
(Register Here)
DOD TechMatch Sponsors
Patent View
 Back to Listing
Patent 7980488 Click For Printable Version of This Patent
Patent Information:  USPTO Site Listing

Patent Number: 7980488
Case ID: 0
Patent Title: Sprinkler with geared viscous hesitator and related method
Status: ACTIVE
Status Date: 8/5/2011 2:03:34 PM
Issue Date: 7/19/2011
Filed Date: 4/29/2008
Serial #: 2/149,264
Assignee Name: Nelson Irrigation Corporation (Walla Walla, WA)
Inventor(s): Townsend, Michael R
Lab Information:  View Lab Profile

Lab Name: U.S. Army Armament Research, Development and Engineering Center
Location: RDAR-EIB
Picatinny Arsenal, NJ 07806-5000
Contact: Contact Lab About This Patent
   
Description:
BACKGROUND OF THE INVENTION

This invention relates to rotary sprinklers and, more specifically, to a rotary sprinkler having a stream interrupter or "hesitator" mechanism that operates in a controlled but non-repeating manner to achieve greater uniformity in the sprinkling pattern and/or to create unique and otherwise difficult-to-achieve pattern shapes.

Stream interrupters or stream diffusers per se are utilized for a variety of reasons, and representative examples may be found in U.S. Pat. Nos. 5,192,024; 4,836,450; 4,836,449; 4,375,513; and 3,727,842.

One reason for providing stream interrupters or diffusers is to enhance the uniformity of the sprinkling pattern. When irrigating large areas, the various sprinklers are spaced as far apart as possible in order to minimize system costs. To achieve an even distribution of water at wide sprinkler spacings requires sprinklers that simultaneously throw the water a long distance and produce a pattern that "st . . . . More
Abstract:
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 . . . . More
Claims:
What is claimed is:

1. A rotary sprinkler comprising: a shaft having a cam, said cam having at least one radially outwardly projecting cam lobe; a rotatable water distribution plate on one end of said shaft adapted to be impinged upon by a stream emitted from a nozzle causing at least said 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 said cam and said at least one cam lobe located within said chamber, and a rotor ring located within said chamber in substantially surrounding relationship to said cam, said rotor ring loosely located within said chamber for rotation and translation, said rotor ring provided with at least two hesitator lobes projecting radially inwardly and movable laterally into and out of a path of rotation of said at least one cam lobe, said rotor ring further provided with a first plurality of radially outwardly projecting teeth se . . . . More