IL36759A - Rotary water sprinkler - Google Patents

Description

LIMITED Invention relates wate sprinklers of the A slow moving rotary Sprinklers of this type are known and comprise a hollow body mountable on a a nozzle assembly rotatable about a vertical axis and relative to the the assembly including at least one nozzle for directing water from the in ah outwardly extending A swing arm carried on the sprinkler is rotatable relative to the body under the action Massing means to a position in a portion at one end of the swing arm is Impinged upon by jet water issuing from one of nozzles when the sprinkler is in The action of the jet impinging upon the portion causes the swing arm to be driven against the action biassing means away from the The biassing means then causes the swing arm to swing back and strike the nozzle assembly with sufficient force to displace it through a small angle relative to the action is continuously repeated when the sprinkler is in use and the sprinkler thus slowly rotates in a far as the cited specification 3043522 is concerned the great difference here is that the arm of the cited specification on pin 46 extending upwardly from bod 10 of the In applicants invention the whole object to avoid the necessity of providing an upstanding pin which serves as a support for the swing The reasons for avoiding the use of a pin that it has been found that with prior art sprinklers the relatively small bearing area between the swing arm and the is subjec to considerable wear when the sprinkler is in It Is that the claim 1 adequately distinguishes applicants invention from this cited Israeli Patent the sprinkler disclosed in this specification has a limb 13 integral wit the nozzle assembly 11 and a pivotable paddle 33 is by the arm It is clear that there is no swing arm as such and therefore it cannot be considered to be to applicants It is an object of the present invention to provide a rotary water sprinkler in which this is According to the present invention a rotary water sprinkler comprises a tubular body adapted to be mounted with its longitudinal axis vertical and for water under pressure to be supplied to its a nozzle assembly supported by the tubular body and rotatable about the longitudinal axis the assenbly including a which is in conrunication with the bore of the body and with the axis of the nozzle directed upwardly and inclined to the longitudinal axis of the a swing arm having a hub portion surrounding and nounted for rotation on said tubular body and an am extending outwardly from the hub portion and carrying a portion arranged to be impinged upon by a jet issuing fron the nozzle to rotate the swing arm in one direction of rotation and means biassing the swing arm for rotation in the opposite direction into engagement with a stop surface rotatable with said nozzle The area of the bearing surface between the hub portion of the swing arm and the tubular body is relatively large and consequently the wear on this bearing surface is reduced when the sprinkler is in use as compared with the known arrangements where the swing arm is rotatable about a Preferably the tubular body comprises a first tubular member adapted to be nounted with its longitudinal axis vertical and a second tubular member coaxially within the first nenber and rotatable relative the nozzle assembly being rotatable with the second tubular In order that the invention be more readily understood it will now be by way of example with reference to the acconpanying drawings in Figure 1 is a side partly in of a sprinkler in accordance with one embodiment of the and Figure 2 is a side partly a second of the Referring to Figuro the tubular body of rotary water sprinkler comprises a first tubular member in the form of a bearing nut 1 which is threadod externally at its lower end to permit the nut to be screwed into an internally threaded socket on a vertical the longitudinal axis of the nut then being Within the bearing nut and therewith is a second tubular Sealing and bearing washers 3 surrounding the tubular member 2 are positioned below the bearing nut 1 and are held in position by a circlip 4 attached to the lower end of the member The upper end of the tubular nomber 2 is attached to a nozzle assembly including a body which defines a water passage 6 connecting the bore of the tubular member 2 to a nozzle 7 the axis of which is inclined to the vertical axis of the member A further nozzle 8 which is inclined to the vertical axis may also be provided on the body cap 9 surrounds the upper end of the member 2 and is biassed away from the member 1 into engagement with the underside of the body 5 by means of a coil spring The upper surface of the cap is provided with one or more upstanding projections 11 and the adjacent surface of the body is provided with recesses to accommodate the projections A swing am 12 has a tubular hub portion 13 is mounted on the first tubular member 1 with a bearing bush 14 between The bearing bush provides a relatively large bearing surface between the two The upper the hub portion is positioned beneath the cap and the hub portion is rotatable relative to the member 1 against the action of biassing means in the form of a spring 15 which surrounds the spring 10 and is secured a one end to the cap 9 and at the other end to the hub portion To adjust the biassing effect of the spring the cap 9 is forced downwardly away the nozzle assembly sufficiently for the projections 11 to bo withdrawn from the recesses and the cap is rotated through an angle to adjust the spring The projections are then repositioned in the recesses 11 The hub portion 13 carries an arm a portion of which extends outwardly and upwardly from the hub portion and at its upper end carries a portion This portion 17 is positioned so as to pass through the jet issuing from the nozzle 7 when the sprinkler is in use and the arm is rotated relative to the bearing When the jet impinges upon the portion the arm is deflected by the jet and rotated against the action of the spring When the 17 has moved away from the jet the spring 15 causes it to swing back in the opposite direction and the arm abuts sharply against a stop surface 18 provided by a lug on the nozzle assembly and censing the nozzle assembly to be rotated through a small angle with respect to the bearing nut The jet from the nozzle again impinges on the portion 17 causing it to be displaced and to then apply a further knock against the stop surface The nozzle assembly is thus slowly rotated with respect to the on which the sprinkler is mounted thus eventually irrigating an area of circular plan surrounding the Referring now to the embodiment of the invention illustrated in Figure the first tubular member 1 surrourds the second tubular member 2 and the lower end of the member 2 is threaded to receive a nut 20 which engages the underside of the washers It is envisaged that by making nut 20 of a suitable plastics material the washers 3 The spray illustrated in Figure 2 also differs fron that shown in Figure 1 in that the spray am is engageable with a stop surface in the form of a lug depending downwardly from the nozzle assembly insufficientOCRQuality

Claims (4)

1. A rotary water sprinkler comprising a first tubular member adapted to be mounted with_its longitudinal axis vertical, a second tubular member coaxlally within the first member and rota ble relative thereto, a nozzle assembly supported by the second tubular member for rotation therewith about the longitudinal axis of the first tubular member, the nozzle assembly including an upwardly directed nozzle the axis o which is inclined to the axle of th first member, a swing arm mounted for rotation on the irst tubula member and including a spoon-like portion arranged to be impinged upon by a water jet Issuing from the nozzle to rotate the swing arm relative to the nozzle in one direction and a spring connected between the arm and the nozzle assembly to bias the swing arm for rotation in the opposite direction into engagement with the nozzle assembly characterised in that the swing arm is spaced from both t he second tubular member and the nozzle assembly and is supported on the first tubular member with a bearing bush interposed therebetween, and wherein the upper end of the bush and th upper ends of the adjacent relatively movable surfaces of the components of the sprinkler are protected from water contamination by an overlying cap forming part of the nozzle assembly. 36759/2

2. A rotary water sprinkler as claimed in Claim 1 characterised I that the cap is separate from the nozzle and the upper side of the cap is biassed into engagement with the underside of the nozzle.

3. · A rotary water sprinkler as claimed in Claim 2 wherein the spring ia connected to the cap and characterised in that the cap is rotatable with respect to the nozzle to adjust the blasslng force provided by the spring.

4. A rotary water sprinkler as claimed in Claim 3 characterised in that the underside of the nozzle and the upperside of the cap are provided with co-acting projections and recesses which permit the cap to be held in desired angular positions with respect to the nozzle.