NUTATING SRPINKLER HEAD

Abstract

A sprinkler head for irrigation having a sprinkler body. The sprinkler body surrounds a fluid delivery tube. The sprinkler body includes an upper plate and a lower plate. A and exits out the fluid nozzle. A fluid distribution cage is positioned on the sprinkler body and around the fluid delivery tube. The fluid distribution cage has one or more arms connecting an upper plate and a lower plate. The lower plate is configured to direct fluid sprayed onto it from the fluid delivery tube. When fluid is sprayed on the lower plate the upper plate begins to nutate around the fluid delivery tube between the upper sprinkler body plate and lower sprinkler body plate. The upper and lower sprinkler body plates have races configured for receiving one or more resilient cushions positioned on the upper plate of the fluid distribution cage. The upper cage plate or the lower sprinkler body plate has one or more projections positioned such that the fluid distribution cage hangs at an angle to facilitate initiation of nutation of the fluid distribution cage.

Claims

1. A fluid distributing sprinkler head, comprising, a fluid delivery tube with an attached fluid nozzle; a sprinkler body partially enclosing said fluid delivery tube and nozzle; a sprinkler body upper plate attached to a lower end of said fluid delivery tube; a sprinkler body lower plate attached to a lower end of said fluid delivery tube; a fluid distribution cage freely attached to said fluid delivery tube lower end, said fluid distribution cage with a lower cage plate with a first and second side, and an upper cage plate with a first and second side, with said cage plates held in a spaced apart relationship by one or more cage arms; wherein said upper cage plate defining a passage for said fluid delivery tube lower end, and also having at least one raised projection adjacent to said passage for said fluid directing tube, said upper cage plate comprising a resilient cushion; said lower cage plate first side having a generally peaked surface, said surface incised by spirally radiating grooves with a peak on said lower plate first side centrally positioned and having a beveled top surface; wherein said fluid distribution cage is configured to hang freely from said pair of raised projections when said cage is without fluid and said sprinkler head is in a vertical position, with said bevel on said lower plate configured for deflection by an initial jet of fluid from said fluid directing tube, to initiate a nutating motion in said cage after said initial deflection with said nutating motion maintained by the force of fluid on said spirally radiating grooves causing said upper cage plate to nutate between said sprinkler body upper plate and said sprinkler body lower plate, wherein said resilient cushion is configured to contact said upper cage plate at said upper cage plate race and said lower cage plate race when said upper cage is nutating between said sprinkler body upper plate and said sprinkler body lower plate.

2. The sprinkler head of claim 1 wherein said at least one raised projection comprises a pair of raised projections adjacent said passage for said fluid directing tube, with said projections positioned opposite each other on a second side of said upper cage plate.

3. The sprinkler head of claim 1, wherein said fluid delivery tube is configured for threaded attachment at a first end to said sprinkler body upper plate, wherein said tube is configured for threaded attachment at a second end to said sprinkler body lower plate.

4. The sprinkler head of claim 1, wherein said resilient cushion comprises a first resilient cushion attached to a first side of said upper cage plate and a second resilient cushion attached to a second side of said upper cage plate.

5. The sprinkler head of claim 1, wherein said fluid delivery tube comprising a relief in an outer circumference of said fluid delivery tube configured to provide for relief from said upper cage plate from contacting said outer surface of said fluid delivery tribe upon initiation of nutation of said fluid distribution cage.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0013] FIG. 1 is a perspective cross sectional view of a first embodiment of a sprinkler head.

[0014] FIG. 2 is a cross sectional view of a first embodiment of a sprinkler head through the center of the sprinkler head.

[0015] FIG. 3 is an exploded view of a first embodiment of a sprinkler head.

[0016] FIG. 4 is a cross sectional view of a second embodiment of a sprinkler head through the center of the sprinkler head.

[0017] FIG. 5 is an exploded view of a second embodiment of a sprinkler head.

[0018] FIG. 6 is a perspective cross sectional view of a second embodiment of a sprinkler head.

[0019] FIG. 7 is a perspective cross sectional view of a third embodiment of a sprinkler head.

[0020] FIG. 8 is a cross sectional view of a third embodiment of a sprinkler head.

[0021] FIG. 9 is an exploded view of a first embodiment of a sprinkler head.

[0022] FIG. 10 is a cross sectional view of a fourth embodiment of a sprinkler head through the center of the sprinkler head.

[0023] FIG. 11 is an exploded view of a second embodiment of a sprinkler head.

[0024] FIG. 12 is a perspective cross sectional view of an embodiment of a sprinkler head.

[0025] FIG. 13 is a cross sectional view of an embodiment of a sprinkler head with a fluid distribution cage at rest on a pair of starting projections.

[0026] FIG. 14 is a cross sectional view of an embodiment of a sprinkler head with a fluid distribution cage initiating nutation.

[0027] FIG. 15 is a cross sectional view of an embodiment of a sprinkler head proceeding toward nutation.

[0028] FIG. 16 is a cross sectional view of the fluid delivery tube of the sprinkler head shown in FIG. 15.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

[0029] While the presently disclosed inventive concept(s) is susceptible of various modifications and alternative constructions, certain illustrated embodiments thereof have been shown in the drawings and will be described below in detail. It should be understood, however, that there is no intention to limit the inventive concept(s) to the specific form disclosed, but, on the contrary, the presently disclosed and claimed inventive concept(s) is to cover all modifications, alternative constructions, and equivalents falling within the spirit and scope of the inventive concept(s) as defined in the claims.

[0030] A first embodiment of the disclosed technology is shown FIGS. 1, 2, and 3. FIG. 1 shows the disclosed sprinkler head in what is called a vertical orientation. The sprinkler head can operate in an inverted orientation, but the orientation shown in the figures will be termed vertical, as regards parts with a top side or a bottom side.

[0031] Extending through the sprinkler body is a fluid delivery tube 15. Typically inserted in the fluid delivery tube is a fluid constriction nozzle 4, which is shaped like a funnel to force the fluid into a more narrow stream, for more velocity and force when it hits the strike plate, and for more distance that the fluid is thrown from the sprinkler head.

[0032] Shown in FIG. 1 is a sprinkler head for an irrigation system. Fluid (or other liquid) enters the irrigation system from an external source via input nozzle 8. Fluid passes from the input nozzle through a constricting fluid nozzle 4 located within the sprinkler head and out of the sprinkler body through a fluid delivery tube 15. In a preferred embodiment the fluid input nozzle can be removed to allow for replacement of the fluid restricting nozzle. The fluid dispelled from the fluid delivery tube strikes a strike plate of a fluid distribution cage 5, which has an upper cage plate 2 (also called a swash plate or ring) and a lower cage plate 17 (also called a strike plate). Each of the cage plates has an upper or first surface and a lower or second surface. The upper and lower cage plates are connected to each other and held in a spaced apart relationship by one or more cage arms.

[0033] Fluid sprayed from the constricting nozzle through the fluid delivery tube hits the strike plate at the peak of the strike plate. The peak has a beveled top surface, which is positioned to cause the cage deflect to one side when first struck by a stream of fluid. The bevel is aligned perpendicular to the raised projections on the underside of the swash plate. The strike plate 17 includes a number of spirally radiating grooves that distribute fluid sprayed from the sprinkler body in an irrigation pattern. The strike plate has an upturned edge around the periphery of the plate that further serves to direct fluid being distributed. A stream of fluid sprayed on the peak from the fluid distribution tube causes the cage to begin nutating around the fluid distribution tube. As the fluid stream continues, the cage nutates around the fluid distribution tube altering the angle and location on the cage that the fluid stream hits, thus continuously altering the fluid pattern distributed from the sprinkler head.

[0034] FIG. 2 shows a cross sectional view of the sprinkler head of FIG. 1. The sprinkler body includes a lower sprinkler body plate 3, and an upper sprinkler body plate 1. These plates are on either side of the upper cage plate 2. The upper cage plate 2 has at least one raised projection 14 which destabilizes the cage plate 28 and helps initiate the nutating motion of the cage when fluid is flowing through the sprinkler head. Also visible in FIG. 2 is a first resilient cushion 11 and a second resilient cushion 10. The first resilient cushion 11 and the second resilient cushion 10 form the lip of the upper cage plate in this particular embodiment, and contact the race 13 in the lower sprinkler body plate and the race 12 in the upper sprinkler body plate 1. The races can be grooves, indentations, or notches in the upper and lower sprinkler body plate configured to accept the resilient cushion of the upper cage plate during the nutation process.

[0035] A weight 7 is shown in the depicted embodiments. The optional weight is utilized to dampen the vibrations caused by the nutation and help prevent wind from blowing the sprinklers away from vertical when they are hung over the crop on hose. Alternatively the weight can be integral with the sprinkler body.

[0036] FIG. 3 illustrates an exploded view of the sprinkler head shown in FIGS. 1 and 2. The fluid delivery tube can be provided as shown to be a unitary piece with the lower sprinkler body plate. The fluid delivery tube and plate can be manufactured as a single piece or alternatively welded, glued or otherwise connected to provide a single piece. Similarly the fluid delivery tube can be integral with the upper sprinkler body plate. Alternatively the fluid deliver tube can be provided as a separate piece from the upper sprinkler body plate and the lower sprinkler body plate as shown in the embodiment depicted in FIGS. 4, 5, and 6.

[0037] FIGS. 4, 5, and 6 illustrate an embodiment of the invention in which the fluid delivery tube is threaded at both ends to provide for threaded engagement with the upper sprinkler body plate and the lower sprinkler body plate. In this embodiment the fluid delivery tube is a metal tube, although other acceptable materials can be used. FIG. 5 depicts a trilobal swash plate 2 connected by three legs to the to lower sprinkler cage plate.

[0038] FIGS. 7 through 12 illustrate embodiments of the invention including a notch 18 in the circumference of the fluid delivery tube. The notch provides a relief for the swash ring on the fluid delivery tube. The notch facilitates the initiation of nutation when fluid is sprayed from the nozzle through the fluid delivery tube and onto the fluid distribution plate (or lower cage plate). Further in a preferred embodiment the escapement 19 of the upper race is provided at an angle to further facilitate initiation of nutation of the fluid distribution cage. The relief, preferably in combination with the angled escapement of the upper race aide in avoiding stalling of the fluid distribution cage by contacting the fluid delivery tube when fluid is first sprayed from the nozzle onto the lower fluid distribution cage.

[0039] FIGS. 13 through 15 illustrate the progression of nutation of the fluid distribution cage when a relief in the fluid distribution tube is utilized as well as an angled race escapement FIG. 13 illustrates the fluid distribution cage at rest on the starting bumps. FIG. 14 illustrates a side of the fluid distribution cage rotating upward due to fluid striking the distribution plate. The upper cushion of the upper cage plate hits the escapement, with the angle of the escapement allowing the cushion to slide into up into the upper race. The inner edge of the upper cage plate proceeds into the relief in the circumference of the fluid delivery tube and prevents the inner edge of the upper distribution cage from rubbing on the circumference of the fluid delivery tube. FIG. 15 illustrates the upper cage plate in nutating position following initiation. The cushions of the swash plate have fully entered the races and nutation is proceeding. FIG. 16 shows a cross sectional view of the fluid delivery tube of FIG. 15 to provide an illustration and representative dimensions of the notch 18 in the fluid delivery tube.

[0040] While certain exemplary embodiments are shown in the Figures and described in this disclosure, it is to be distinctly understood that the presently disclosed inventive concept(s) is not limited thereto but may be variously embodied to practice within the scope of this disclosure. From the foregoing description, it will be apparent that various changes may be made without departing from the spirit and scope of the disclosure as defined herein.