Improvement in oscillating lawn sprinklers

Abstract: An oscillating lawn sprinkler (4) comprises a pipe (7) provided with spray nozzles and pivotally mounted on a bearing block (5). The spray pipe (7) is driven by the water pressure through a turbine-type motor enclosed in a driving mechanism box (6). The driving box (6) is connected with the water supply hose on one side and with one end of the spray pipe (7) on the other side. Means (21) for adjusting the flow rate of the water delivered by the spray pipe and means for adjusting the oscillating range of the spray pipe are arranged, together with their control means (26, 9), on the side of the driving box (6) which is opposite to the one to which the spray pipe is linked. Filtering means (33) for the supply water are removably housed at the inlet side of the water connection fitting (8) of the driving box.

Description: The invention relates to an oscillating lawn sprinkler which is capable to be freely placed on the ground and to be connected with a water supply source in view of irrigating tilled areas such as lawns, gardens, etc. A sprinkler of this type basically consists of a pipe featuring a number of spray perforations or nozzles, pivotally mounted on a bearing block and driven by the water pressure through a turbine-type motor enclosed in a sealed box. The bearing block usually has a longitudinally extended shape, while the box containing the driving mechanism is mounted in correspondence of one of its ends in such a way as to be connected with the water supply source and, at the same time, act as a driving support for at least one of the ends of the oscillating pipe. Mechanical control means are furthermore provided in the box containing the driving mechanism, which can be used to selectively confine the surface of the area to be watered. Sprinklers of this kind are known for instance from the US patents 3.559.888, 4.245.786 and 4.721.248. These sprinklers, however, have a major drawback in their controls for selectively confining the surface of the area to be sprayed being located in a quite unconvenient site. As a matter of fact, these control means are generally mounted on the inner side, ie. the one looking towards the spraying pipe, of the box containing the driving mechanism, just below the end part of the spraying pipe itself. As a consequence, each time that said control means need to be adjusted, the user is compelled to shut off the water supply, lift the sprinkler to a much more convenient position where its controls are better seen and easier reached at for actuation, adjust the controls, replace the sprinkler and, finally, turn on again the water supply. The considerable inconvenience of the whole handling is further aggravated by the frequently occurring situation in which the water supply cock lies quite far away from the sprinkler itself. Similar drawbacks are shown from the US-A-3,175,770 and US-A-3,567,122 wherein a sprinkler is provided with a water flow adjusting valve. Indeed, also in said prior art, most of the control means are arranged on the inner side of the box containing the driving mechanism of the spraying pipe. Also in this case the handling is made particularly unconvenient if the water supply cock is sited far away from the sprinkler or in a location from where the sprinkler itself cannot be seen. Furthermore, sprinklers in general can be connected to water supply sources which are different from a drinking water supply conduit. For instance, they can be supplied with water from open irrigation canal through proper delivery pumps. They therefore require a filtering device to retain all such particulate contaminants and foreign matters as may be delivered with the water, which are likely to damage the turbine-like driving mechanism of the sprinkler. Such a strainer is usually inserted at the end side of the water supply hose which has to be connected with the water supply intake fitting of the sprinkler by means of a ring nut. Such an arrangement of the strainer, however, is again quite unconvenient in that it makes it rather difficult to clean its filtering surface when it becomes clogged. As a matter of fact, the strainer is quite often fitted in a fixed way in the end fitting of the water supply hose and, in all cases where it can be removed, it becomes necessary to disassemble the whole fitting in order to be able to clean its filtering surface. Therefore it is a principal object of the present invention to provide a sprinkler that overcomes the dra w backs of the prior art thanks to the fact that all the operating devices as well as the water filtering device are arranged in such away as to ensure greater convenience in use as well as better operating effectiveness of the sprinkler itself. This object is obtained, according to the invention, by means of a sprinkler as defined in claim 1. The characteristics of the invention will become more apparent from the description which follows by way of non-limiting example with reference to the accompanying drawings in which: Figure 1 is a front view of the sprinkler according to the invention; Figure 2 is a side view of the sprinkler according to Fig. 1; Figure 3 is a top view of the sprinkler according to Figs. 1 and 2. The sprinkler 4 shown in the Figures includes a bearing block 5 which supports the driving mechanism box 6 and the oscillating spray pipe 7. The driving mechanism box 6 is of a traditional water-pressure type and includes all such components as required to operate the spray pipe 7 (eg. the turbine-like motor, the mechanism to adjust the oscillating range of the spray type, etc.), which are already well-known and therefore do not require any further description. It should be sufficient here to remember that the sprinkler 4 is operated by the pressure that the water flowing into the driving mechanism box 6, through the inlet connection 8, imparts on the blades of a turbine-like motor which is mechanically linked with the spray pipe 7. It should be noticed that said driving mechanism box 6 is already duly fitted with both the afore mentioned device to adjust the oscillating range of the spray pipe 7, through the actuation of the control knob 9, and a suitable device to further adjust the flow rate of the water delivered by the spray pipe 7 itself. Said water-flow adjusting device comprises a sleeve 1⊘ which is pressed through two pipe unions 11, 12 (Fig.3) that are provided in the wall of the driving mechanism box 6. Said sleeve 1⊘ is provided with annular grooves 13, 14 to accomodate corresponding sealing rings 15, 16 and it features two opposed openings (only one opening 17 is shown in Fig. 3) having an elongate shape and capable of letting the supply water flow from the driving mechanism box 6 to the spray pipe 7. The open end of the spray pipe 7 is attached by pressure fitting to the inwardly facing end of the sleeve 1⊘. In correspondence of the outwardly facing end of the sleeve 1⊘, an inner annular groove 18, an axial projection 19 and a cylindrical housing 2⊘, which is arranged externally to the sleeve 1⊘ and coaxially with respect to the latter (fig.3), are obtained, all of which are capable to co-operate with a valve 21 for adjusting the water delivery rate. Said valve 21 is essentially formed by a stem 22, on the inner end of which two opposed tabs 23, 24 are provided which are capable to throttle the water passage openings 17. The outer end of the valve stem 22 is provided with a retaining collar 25 and an adjustment knob 26. Said valve 21 is simply fitted into the sleeve 1⊘, where it is retained by its collar 25 engaging as a spring latch into the afore mentioned groove 18 of the sleeve 1⊘, as well as by two spring tabs 27, 28 which are capable to co-operate with the inner edge of the pipe union 12 in order to prevent the sleeve 1⊘ to be accidentally extracted from the driving mechanism box 6. The throttling tabs 23, 24 of the valve 21 show a surface which is tapered toward their free end in order to enable also small flow-rate variations to be accomplished. As a matter of fact, through the adjustment knob 26 said tabs 23, 24 can be rotated over the whole range between two extreme settings, ie. for full and minimum water flow-rate repectively, in correspondence of each one of them a radial projection 29 of the knob 26 strikes against the longitudinal edges of the afore mentioned axial projection 19 of the sleeve 1⊘, thereby creating corresponding positive limit stops. The device provided for adjusting the oscillating range of the spray pipe 7 is essentially of a known type, except for its being peculiarly arranged on that side of the driving mechanism box 6 which is opposed to the one where the end of the spray pipe 7 is connected, as well as its being mechanically linked with the previously described sleeve 1⊘. As a matter of fact, on the outward end of the sleeve 1⊘ a flange 3⊘ is integrally obtained which is capable of linking the device for the adjustment of the oscillating range (knob 9 and linking rods connected with it) with the sleeve 1⊘ supporting one end of the spray pipe 7. Further to the advantages deriving from such a provision of a device for adjusting the flow rate of the delivery water and the arrangement of all adjustment controls on the external, ie. more easily accessible side of the driving mechanism box 6, the sprinkler according to the present invention is designed in such a way as to allow for a more convenient arrangement of the water filtering device inside the pipe union 8 provided for the connection of the water supply hose. In the described embodiment of the sprinkler, said pipe union 8 is made in the form of a "male-type" connection fitting (Fig.3) to be snap-fitted into a corresponding "female-type" fitting attached to the end of the water supply hose (not shown in the Figures). Inside the hose-connection fitting 8 a counterbore 31 is provided, against which the open edge 32 of a cartridge strainer 33 can rest. This cartridge strainer can therefore be inserted in an easily removable way into the water supply conduit of the sprinkler itself (Fig.1). Furthermore, two longitudinal bevel cuts 34, 35 (Fig.2) are provided on the inner surface of the connection fitting 8, which are capable to allow, through the insertion of any kind of suitably pointed tool, for easy removal of said filtering cartridge 33 and, as a consequence, convenient removal of all particulate contaminants and foreign matters retained by the cartridge itself. With the sprinkler according to the above description, the objects of the invention can be considered as fully reached through the provision of a device for adjusting the water delivery flow-rate, as well as through the arrangement of all user controls of the sprinkler on a much more convenient location. The object is furthermore reached of obtaining a water filtering device which is made independent of any part or component outside the sprinkler itself and is housed in an easily removable way inside the water supply conduit of the sprinkler. It will of course be appreciated that the above described sprinkler may also be the subject of any such modifications as considered to be appropriate, without departing from the scope of the invention as claimed hereinafter.

Claims: Oscillating sprinkler comprising a bearing block (5) on which a pipe provided with spray nozzles (7) is pivotally mounted on a horizontal axis, said pipe being actuated by the water pressure, through a turbine-like motor enclosed in a driving mechanism box (6) connected with the water supply hose on one side and with at least one end of the spray pipe itself on the other side, in such a way as to be made oscillating according to an angle or over a range which can be set through proper adjusting means provided in the driving mechanism box, said driving mechanism box (6) comprising means (21) for adjusting the flow rate of the water delivered by the spray pipe (7), characterized in that said adjusting means (21) for the water flow rate and said adjusting means for the oscillating range of the spray pipe (7) are arranged, together with their control means (26,9), and also with filtering means (33) for the supply water, on the side of the driving mechanism box (6) which is opposed to the one to which one end of the spray pipe (7) is linked. Sprinkler according to claim 1, characterized in that said adjusting means for the flow rate of the water delivered by the spray pipe (7) include a valve (21) co-operating with a sleeve (10) which is tightly inserted through the driving mechanism box (6) and is provided with openings (17) communicating with the inside of the driving mechanism box (6), one end of said sleeve (10) being linked with the oscillating spray pipe (7) and the other end of the sleeve (10) housing said valve (21) capable of throttling the water flow through said openings (17). Sprinkler according to claim 1 or 2 characterized in that said valve (21) comprises a stem (22) which is coaxially inserted in the sleeve (10) and is there free to rotate over an angle that approximately corresponds to the actual aperture of the openings (17), the inner end of said stem (22) being provided with at least two tabs (23, 24) capable of throttling the openings (17) ensuring the passage of the water through the sleeve (10), and the outer end of said stem (22) being provided with both means (25) for engaging with the sleeve (10) and actuation means (26,29) which are capable of co-operating with corresponding retaining means (18) and rotation-limiting means (9), respectively, which are provided in the sleeve (10). Sprinkler according to claims from 1 to 3, characterized in that said means provided for engaging the stem (22) with the sleeve (10) are in the form of a collar (25) capable of engaging in a spring-latch manner into a corresponding annular groove (18) machined inside the sleeve (10), and that said actuation means are in the form of a knob (26) which is provided with a radial projection (29) capable of striking against the outer edges of an axial projection (19) of the sleeve (10) in order to limit the angle of rotation of the valve (21). Sprinkler according to claims from 1 to 4, characterized in that said throttling tabs (23, 24) of the valve (21 ) feature a tapered surface. Sprinkler according to claims from 1 to 5, characterized in that said sleeve (10) is mechanically linked with the device provided for adjusting the oscillating range of the spray pipe, by means of a flange (30) which is integrally obtained at the outer end of the sleeve (10). Sprinkler according to claim 1, in which said driving mechanism box is connected with the water supply hose through interposed filtering means for the supply water, characterized in that said water filtering means (33) are housed in a removable way in said driving mechanism box (6). Sprinkler according to claim 7, characterized in that said water filtering means consist in a cartridge-type strainer (33) which is removably housed at the inlet side of the water supply connection fitting (8) of the driving mechanism box (6). Sprinkler according to claim 8, characterized in that said water supply connection fitting (8) is internally provided with a counterbore (31) for the open edge (32) of the strainer cartridge (33), and shows on its inner surface one or more longitudinal chamfer cuts (34, 35) designed to allow, through the introduction of any suitable pointed tool, for easy removal of the strainer cartridge (33) from its seat (31).

Inventors: BORGHESE ALLADINO, LICCIARDELLO MARANZANA MARIA, BORGHESE, ALLADINO, LICCIARDELLO MARANZANA, MARIA
Applicants: UNIFLEX UTILTIME SPA, UNIFLEX UTILTIME S.P.A.
Application year: 1989
Main classification: B05B3
IPC codes: B05B3