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Patent Number: |
7980488 |
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Case ID: |
0 |
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Patent Title:
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Sprinkler with geared viscous hesitator and related method
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Status: |
ACTIVE |
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Status Date: |
8/5/2011 2:03:34 PM |
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Issue Date:
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7/19/2011 |
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Filed Date:
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4/29/2008 |
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Serial #:
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2/149,264 |
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Assignee Name:
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Nelson Irrigation Corporation
(Walla Walla,
WA)
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Inventor(s):
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Townsend, Michael R |
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Lab Name: |
U.S. Army Armament Research, Development and Engineering Center |
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Location: |
RDAR-EIB
Picatinny Arsenal, NJ 07806-5000 |
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Contact: |
Contact Lab About This Patent |
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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 |
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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 |
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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 |
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