Fluid sprinkling – spraying – and diffusing – Plural interchangeable discharge modifiers – outlet... – Selectively arrangeable outlet means
Reexamination Certificate
1998-09-16
2001-05-01
Walczak, David J. (Department: 3751)
Fluid sprinkling, spraying, and diffusing
Plural interchangeable discharge modifiers, outlet...
Selectively arrangeable outlet means
C239S562000, C239S568000
Reexamination Certificate
active
06223999
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to static sprinklers, and particularly to static sprinklers having a presettable water discharge pattern.
Static (i.e., non-rotatable) water sprinklers are constructed to provide different water discharge patterns according to the area to be wetted by the respective sprinkler in any particular irrigation system. For example, static sprinklers may be required to discharge the water in the form of wide strips on both sides of the sprinkler or only on one side, or in the form of narrow strips on both sides of the sprinkler or only on one side. While many static sprinkler constructions are known enabling presetting the sprinkler to produce a desired water discharge pattern, the known constructions generally do not permit presetting a large number of different discharge patterns, and/or require relatively complicated parts which are expensive to produce, assemble and/or maintain.
OBJECTS AND BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide a static water sprinkler enabling it to be preset to produce a desired water discharge pattern, which sprinkler is constituted of a few relatively simple parts that can be produced and assembled in volume and at low cost. Another object of the invention is to provide a static sprinkler which permits a relatively large number of water discharge patterns to be preset.
According to a broad aspect of the present invention, there is provided a static sprinkler presettable to select a desired water discharge pattern, comprising: a first part formed with a water inlet, and a cavity defined by a cylindrical surface and extending axially from said water inlet; and a second part carried by said first part, said second part having a cylindrical stem received within said cavity, and an outer end closing said cavity; one of said parts being formed with a plurality of angularly-spaced water discharge openings communicating with said cavity, said water discharge openings being of different configurations to produce different water discharge patterns, at least one of said discharge openings producing a narrow water discharge pattern, and at least another of said discharge openings producing a wider water discharge pattern; the other of said parts being formed with at least one axially-extending passageway extending axially from said water inlet to said discharge openings in said one part; said second part and stem being rotatably presettable with respect to said first part to align said passageway of said other part with one of said water discharge openings in said one part to thereby enable selection of the water discharge pattern of the sprinkler.
Two embodiments of the invention are described below wherein the stem has an outer surface of cylindrical configuration for its major surface area engageable with the inner cylindrical surface of the cavity; and wherein the first part is a body member and constitutes the part formed with a plurality of angularly-spaced water discharge openings; and the second part is a cap and constitutes the part formed with the at least one axially-extending passageway.
A third embodiment of the invention is also described, wherein the first part is a cap and constitutes the part formed with a plurality of angularly-spaced water discharge openings, each water discharge opening being at the outer end of a passageway formed in the cap stem; and the second part is a body member and constitutes the part formed with the at least one axially-extending passageway.
According to yet additional features in the described preferred embodiments, the sprinkler may further include a base member attached to the inner end of the first part and formed with an annular flow-control surface with respect to the inlet of the sprinkler; and a screw threaded in the first part and carrying an enlarged head adjustable towards and away from the annular flow-control surface to adjust the sprinkler flow rate.
As will be described more particularly below, the foregoing features of the invention enable static water sprinklers to be constructed with a relatively few simple parts which can be produced and assembled in volume and at low cost, and which also permit a large number of different water discharge patterns to be preselected.
Further features and advantages of the invention will be apparent from the description below.
REFERENCES:
patent: 5050800 (1991-09-01), Lamar
patent: 5083709 (1992-01-01), Iwanowski
patent: 5556036 (1996-09-01), Chase
patent: 5642861 (1997-07-01), Ogi et al.
Hadar Yoram
Lemelshtrich Noam
Barish Benjamin J.
Lego Irrigation Ltd.
Walczak David J.
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