| 摘要 |
A portable lawn sprinkler comprising a housing assembly having means defining a fixed horizontally extending water inlet having a female hose fitting on the exterior end thereof and a spaced fixed annular wall providing an interior periphery defining an annular vertically opening water outlet. A speed reducing unit is mounted within the housing assembly. An impeller is drivingly associated with the input shaft of the speed reducing unit in a position to be rotated by water under pressure flowing from the inlet to the outlet. A rotary water distributor is fixed to the output shaft of the speed reducing unit disposed in water communicating relation with the outlet. An annular member is mounted for axial movement within the annular water outlet and in surrounding relation with the output shaft and has an exterior periphery disposed within the interior periphery of said fixed annular wall. An O-ring seal sealingly is mounted between the exterior of the annular member and the interior periphery of the fixed annular wall in such a way as to accommodate any relative axial movement of the annular member with respect to the fixed annular wall. A spring acts between the housing assembly and the annular member so as to resiliently urge the latter upwardly and to maintain an upwardly facing sealing surface on the annular member in sealing engagement with a downwardly facing sealing surface on the rotary distributor. The housing assembly provides interior flow directing surfaces for directing the water therein to flow from the impeller and then upwardly between the output shaft and the annular member into communicating relation to the rotary distributor.
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