TECHNICAL FIELD

[001] Embodiments of the invention relate to rotating sprinklers specifically for use in irrigation applications. BACKGROUND

[002] Irrigation sprinklers are normally required to have a relative uniform distribution of water around an area covered by the sprinkler. Various arrangements exist for addressing this need.

[003] US7216817 for example describes an impact sprinkler drive provided by an impact arm or spoon that rotates out of and counter-rotates into a water stream to impact and forward re- align a water emission portion from which the water stream emits. The impact arm is designed to, upon sufficient rotation, interfere with the water stream to reduce back-impact and reverse re-alignment of the water stream. The impact arm may be an impact spoon formed on an impact disc

[004] Other arrangements may be proposed for obtaining such uniform distribution of sprinkled water, however, with a simpler construction

SUMMARY

[005] The following embodiments and aspects thereof are described and illustrated in conjunction with systems, tools and methods which are meant to be exemplary and illustrative, not limiting in scope. [006] In an aspect of the present invention there is provided a rotating sprinkler comprising a housing and a movable core having retracted and extended states relative to the housing along a vertical axis X of the sprinkler, the core comprising a cover (12), an impact member (14) and a stream deflector (16); wherein in the extended state both the cover and the impact member can pivot between pivoted and non-pivoted states about a hinge defining an axis H generally orthogonal to axis X and the stream deflector is fixed against rotation about the hinge.

[007] In an aspect of the present invention there is also provided a rotating sprinkler comprising a housing and a movable core having retracted and extended states relative to the housing along a vertical axis X of the sprinkler, the core comprising a cover, an impact member, a gear train and a stream deflector; wherein in the extended state liquid flowing through the sprinkler is arranged by the deflector to be split into first and second liquid streams, wherein the first liquid stream is emitted substantially unobstructed to the ambient environment and the second liquid stream at least partially impacts against the impact member to power movement in the gear train that in turn urges rotation of at least a portion of the sprinkler about axis X.

[008] In addition to the exemplary aspects and embodiments described above, further aspects and embodiments will become apparent by reference to the figures and by study of the following detailed descriptions.

BRIEF DESCRIPTION OF THE FIGURES

[009] Exemplary embodiments are illustrated in referenced figures. It is intended that the embodiments and figures disclosed herein are to be considered illustrative, rather than restrictive. The invention, however, both as to organization and method of operation, together with objects, features, and advantages thereof, may best be understood by reference to the following detailed description when read with the accompanying figures, in which: [010] Figs, 1 to 3 schematically show an irrigation sprinkler according to a first set of embodiments; and

[Oi l] Figs, 4 to 9 schematically show an irrigation sprinkler according to a second set of embodiments.

[012] It will be appreciated that for simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, where considered appropriate, reference numerals may be repeated within the figures to indicate like elements.

DETAILED DESCRIPTION

[013] Attention is first drawn to Figs. 1A and IB illustrating an embodiment of a sprinkler 10 here of a so-called vertical-type. In Fig. 1 A sprinkler 10 is seen in a retracted state and in Fig. IB in an extended state, where retraction and extension occurs along an axis X of the sprinkler. Sprinkler 10 has a stationary outer peripheral housing 1 and a movable core 2 that includes a foldable cover 12, an impact member 14 having here a generally S- shape in a side view, a stream deflector 16, a nozzle 18, a biasing means 20 here in form of a compression spring, a seal 22 and a filter 24. An inlet 26 formed here at a lower side of housing 1 is arranged to permit entry of liquid into the sprinkler.

[014] When idle, e.g. when exposed to substantially "zero" pressure or a pressure below an’activation threshold' at inlet 26, the core of sprinkler 10 is arranged to be maintained in a retracted state in relation to housing 1 due to biasing means 20 and upon exposure to substantial pressurized liqui entering inlet 26 from upstream, the sprinkler's core is arranged to be urged upwards along axis X against biasing means 20 towards the sprinkler's extende state. Said’activation threshold' may be determined, inter alia, according to the biasing force applied by biasing means 20. [015] With attention additionally drawn to Figs 2A to 2D it is seen that both impact member 14 and cover 12 can be arranged to rotate about a hinge H extending through a body 160 where deflector 16 is formed. Hinge H has an axial extension generally orthogonal to axis X. An arm 140 linking impact member 14 to hinge H here includes a secondary stop 141, body 160 here includes a first primary stop 161 and cover 12 here includes a bulge 121

[016] Cover 12 can be urged to rotate about hinge H (in a rotational direction R2 indicated in Figs 2A and 2B) possibly via a biasing means (not shown) until its bulge 121 meets and abuts against stop 161. The urging of the cover to rotate about hinge H can occur in the extended state of the sprinkler.

[017] Impact member 14 can rotate (possibly due, inter alia, to gravitational force) in a rotational direction R1 towards a first position (seen e.g. in Fig 2B) where stop 141 bears against body 160 to position an entry 1401 of impact member 140 opposite deflector 16 in a position suitable to receive a liquid jet emitted downstream via deflector 16 (see, e.g., Fig. 2C).

[018] Impact member 14 can additionally be urged to rotate about hinge IT in the rotational direction R2 (a counter direction to Ri) towards a position where it can meet and bear against bulge 121 possibly when bulge 121 bears against stop 161 (see Fig. 2A)

[019] Arrow' 28 indicated in Figs. 2C and 2B illustrates the S- shaped path that a liquid jet emitted out of deflector 16 passes through impact member 14. The liquid jet emitted out of impact member 14 to the ambient environment may be arranged by the formation of impact member 14 to form vector forces urging both rotational forces about an axis X of the sprinkler and about hinge H.

[020] Attention is drawn to Figs 3A and 3B illustrating the discussed vector forces formed by liquid jet 28 as it is emitted out of impact member 14 to the ambient environment A first vector force 281 (see Fig 3 A) urges moment force about axis X and thus rotation of the sprinkler's core about axis X. A second vector force 282 (see Fig. 3B) urges moment force about hinge H and thus rotation of impact member 14 about hinge H in the rotational direction R2.

[021] During start of an irrigation process, pressurized liquid entering sprinkler 10 in its retracted state is arranged to flow via filter 24, nozzle 18 and deflector 16 and initially fill a void 30 located below cover 12 (see void 30 indicated in Fig 1A) The pressurized liquid bearing against the members of sprinkler's core initially urge the sprinkler to lift towards its extended state seen in Fig. IB.

[022] The liquid jet 28 then passing through impact member 14 and forming the vector forces 281 , 282 when emitted to the ambient environment, is arranged to form incremental rotational steps about axis X. Such incremental steps may be formed due to the combined movements about axis X and H formed by the emitted liquid jet 28. The rotation about axis X formed by vector force 281 goes on until the entry 1401 of impact member 14 is urged by vector force 282 out of liquid communication with liquid flowing out of deflector 16.

[023] Attention is drawn to Figs. 4 and 5 illustrating another embodiment of a sprinkler 100 of the present invention. In these figures sprinkler 100 is seen in an extended state along an axis X of the sprinkler. Sprinkler 100 has a stationary outer peripheral housing 1111 and a movable core 2000 that includes a cover 1200, an impact member 1400 here in form of a rotor, a stream deflector 1600 and a nozzle 1800. An inlet 2600 formed here at a lower side of housing 1111 is arranged to permit entry of liquid into the sprinkler.

[024] When idle, the core of sprinkler 100 is arranged to be maintained in a retracted state in relation to housing 1111 (not shown) and upon exposure to pressurized liquid entering inlet 2600 from upstream, the sprinkler's core is arranged to be urged upwards along axis X towards the sprinkler's extended state.

[025] In the extended state, liquid flowing through the sprinkler is arranged by deflector 1600 to be split into two streams. A first stream 2810 illustrated by the otted arrow' in Fig. 5 is arranged to reach relative large distances since it has a general "free" path out of the sprinkler to the ambient environment. A second stream 2820 is arranged to impact the rotor of impact member 1400 and urge it to rotate about an axis I generally parallel to axis X.

[026] Attention is drawn to Fig. 6 for a useful view of a gear train or transmission provided in sprinkler 100. An upper cogwheel 7 coupled to rotate with impact member 1400 is arranged to mesh with a cogwheel 9 and by this meshing engagement urge a first gear ratio reduction. In addition, the interaction of cogwheel 7 with interior teeth formed within cogwheel 9 permit placement of impact member 1400 at a location within the sprinkler that is set aside from axis X

[027] A third cogwheel 11 in the sprinkler's gear train is fixed for rotation about a pin 111 that acts as an axis of rotation. Pin 111 is fixed to an upper side of cogwheel 9. Cogwheel 11 meshes simultaneously with two cogwheels 13, 15 both arranged to rotate about axis X. Cogwheel 13 is fixed for rotation together with stream deflector 1600 and thus rotation of cogwheel 13 about axis X is arranged to rotate also deflector 1600 about axis X in the same rotational direction.

[028] Cogwheel 15 in this example is an integral part of cover 1200 and in instances where cover 1200 is rotationally fixed in relation to housing 1111, cogwheel 15 is consequently also rotationally fixed in place. In an embodiment of the invention, cogwheels 13, 15 do not have a similar number of teeth. For example, in at least certain cases, the number of teeth at cogwheel 13 may be arranged to differ by 'one' from the number of teeth at cogwheel 15. For example, while cogwheel 13 may be designed to have 70 teeth cogwheel 15 may be designed to have 69 teeth, and hence in such example - for each full rotation of cogwheel 9 about axis X, cogwheel 13 progresses in an angular direction about axis X by one tooth in relation to cogwheel 15 (which remains fixed in place).

[029] Rotation of cogwheel 13 accordingly urges displacement of impact member 1400 about axis X. Legs 3000 fixed to cover 1200 are arranged to rotationally fix the cover in relation to housing 1111. By way of an example, in the following - rotational directions of elements within sprinkler 100 will be demonstrated. When viewed from above, in an arrangement where cogwheels 7 and 9 and impact member 1400 are arranged to rotate in a first rotational direction (e.g. counter-clockwise motion) - cogwheels 11 and 13 will be urged to rotate in a second opposing rotational direction (e.g. clockwise motion) - where the rotational motion of the streams 2810, 2820 about the sprinkler's axis X will be in the second rotational direction.

[030] Attention is drawn to Fig. 7 illustrating an embodiment of a sprinkler 1000 that mainly differs from sprinkler 100 in being absent of means (such as legs 3000 in the former embodiment) for fixing/halting the rotation of the sprinkler's cover. Instead, sprinkler 1000 may include impinging members 3010 fixed to the sprinkler cover 1212 that are arranged to have a profile encouraging rotation of the cover about the sprinkler's axis X each time that an impinging members 3010 is hit by the first "free" liquid stream 2810 of the sprinkler. Absence of fixing of the cover against rotation in sprinkler 1000 - permits the cover to rotate about the sprinkler's axis X.

[031] In Figs 8 A and 8B such a scenario is illustrated, where in Fig. 8 A the emitted liquid jet 2810 is seen passing un-obstructed ("free") out of the sprinkler, while in Fig. 8B same liquid jet is seen striking against one of the impinging members 3010 of the cover. The liquid jet 2810 meeting impinging member 3010 forms a moment force M that urges the cover to rotate about the sprinkler's axis X.

[032] Attention is drawn to Fig. 9 providing at its left-hand side a perspective side view ⁷ and at its right-hand side a partial cross-sectional view ⁷ of sprinkler 1000. The second liquid stream 2820 of sprinkler 1000 powers via. "rotor" impact member 1400 the "power train" of cogwheels 7, 9, 13 and 15 best seen in Fig. 6A - while the first liquid stream 2810 is accordingly emitted along a "free" path out of the sprinkle except during instances where it impacts an impinging member 3010 to urge rotation of the cover.

[033] As seen in the cross-sectional view at the right-hand side of the figure, during operation the sprinkler rises and remains at an elevated operative position. At this elevated/raised position the sprinkler, here via its nozzle 1800, 'presses' against portions of the sprinkler. In this example, such 'pressing ^* action occurs against a seal 1900.

[034] In any case, friction occurring due to this 'pressing ^* action creates frictional forces that are designed to form a 'primary anchoring region ^* suited to substantially resist rotational forces occurring during operation of the sprinkler. In this example, friction occurring inter alia where nozzle 1800 presses against seal 1900 contributes to formation of the 'primary anchoring region ^* .

[035] At an upper side of the nozzle on the other hand, smaller frictional forces occurring at a region where stream deflector 1600 couples to the nozzle, form a 'secondary anchoring region' that is less resistant to rotational forces than the 'primary anchoring region'.

[036] When viewing sprinkler 1000 from above, in an arrangement where cogwheels 7 and 9 and impact member 1400 are arranged to rotate in a first rotational direction (e.g. counter-clockwise motion) - cogwheels 11, 13 and 15 will be urged to rotate in a second opposing rotational direction (e.g. clockwise motion) - resulting in this embodiment in rotational movement of the sprinkler's cover 1212 while the liquid streams 2810, 2820 remain fixed in place due to friction occurring at the 'primary anchoring region ^* and the 'secondary anchoring region ^* .

[037] Cover 1212 rotates about the sprinkler's axis X until one of its impinging member 3010 intercepts liquid stream 2810 to consequently form a moment force M that overcomes the frictional forces existing at the 'secondary anchoring region' 1910. In turn an incremental rotational movement of deflector 1600 is formed about the sprinkler's axis, which advances deflector 1600 about axis X so that a new sector about axis X receives irrigation.

[038] This action of interaction between the cover's impinging member and liquid stream 2810 repeats itself each time an impinging member intercepts the liquid streams 2810 resulting in incremental rotational movements of the liquid streams about axis X to provide even irrigation about the axis. [039] It is noted that impinging members 3010 according to various embodiments of the invention may take various forms, other than those illustrated For example, the angle of slanting of an impinging member 3010 at its impact face 3011 relative to an incoming liquid stream 2810 may vary - affecting the moment force M applied upon the cover. In some cases, such variance may exist in the same sprinkler. Also, angular distances between impinging members may vary - resulting at least in some (and possibly all) impinging members not necessarily being symmetrically distributed about the sprinkler's axis. Such variances may assist in obtaining a more arbitrary distribution of liquid about the sprinkler's axis resulting in a more even distribution of irrigation by such sprinkler embodiments.

[040] While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and non-restrictive; the invention is thus not limited to the disclosed embodiments. Variations to the disclosed embodiments can be understood and effected by those skilled in the art and practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word“comprising” does not exclude other elements or steps, and the indefinite article“a” or“an” does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures can not be used to advantage. Any reference signs in the claims should not be considered as limiting the scope.

[041] Although the present embodiments have been described to a certain degree of particularity, it should be understood that various alterations and modifications could be made without departing from the scope of the invention as hereinafter claimed.