Fluid sprinkling – spraying – and diffusing – With fixed support for or ground installed supply means – Embedded or buried sprinkler
Reexamination Certificate
2000-04-03
2001-07-24
Morris, Lesley D. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
With fixed support for or ground installed supply means
Embedded or buried sprinkler
C239S201000, C239S456000, C239S451000, C239S539000, C239SDIG001, C239S457000
Reexamination Certificate
active
06264117
ABSTRACT:
DESCRIPTION
The present invention concerns a spray nozzle for pop-up underground sprinkler.
As known, underground sprinklers or pop-up sprinklers deliver water at a nozzle fixed to the mobile part of the sprinkler and therefore subject to the characteristic up and down movement of sprinklers of that type.
A form of nozzle currently in use provides for a fixed main body that is suitable to receive the water flow coming from the sprinkler and to deliver it toward the outside under form of pre-established rate spray and a revolving ring nut associated with the aforesaid main body in order to allow the adjustment of the spray angle. The main body is made up of an annular lower portion that is fixable to the upper end of the mobile part of the sprinkler and communicates with the orifice for the output of the same, an intermediate cross wall provided with a distribution of holes for the flow of water, an upper annular portion, a hub portion placed coaxially inside said upper annular portion and axially bearing a screw for adjusting the length of the spray, and a covering cap that is fixed over said hub portion. The revolving ring nut is in turn made up of a annular wall that is arranged around and threadedly engaged with said upper annular portion of the main body and of an upper cross wall that surrounds said hub portion while leaving around it an annular passage for the outflow of water from the area defined between said hub portion and said upper annular portion of the main body and it is in addition interposed between the top of said annular upper portion and said covering cap of the main body in order to define with the latter an adjustable radial flow shaped as a scroll for the formation and the outflow of a spray of water having adjustable angle.
In view of this state of the art the present invention aims at realising a spray nozzle for underground sprinklers of the pop-up type that has some advantageous aspects as regards the ones currently known of the aforesaid type. According to the invention a nozzle is provided that in first place is characterized in that the upper cross wall of the revolving ring nut has a bottom cavity shaped as a scroll that defines an accumulation chamber in which the flow of water in the area comprised between the hub portion and the upper annular portion of the main body is subject to compression for the formation of a uniform output spray at said adjustable radial passage.
In this way the annoying formation of lobes in the output spray of the nozzle is prevented.
According to another characteristic of the present invention it is further provided that the lower surface of the covering cap of the nozzle has a short discontinuity in radial direction that allows to break and to deviate a part of the spray in order to have the water reach also areas near the sprinkler.
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Akerman & Senterfitt
Claber S.p.A.
Morris Lesley D.
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