Underground-installable rotary spray irrigator device, with emission angle selectable from the top

Claim 1

An underground-installable spray irrigator device with a piston-type spray element raisable and rotatable by the pressure of the irrigation water, comprising a turbine which is rotated by the water pressure to rotate the rotatable portion of the piston-type spray element by way of a reduction gear, wherein the turbine is fed in the lower part of the casing of the device by feed means which are orientated obliquely to the turbine axis in such a manner as to provide the same direction of rotation, and are mobile between two stable positions in which they are orientated in opposite directions, they being connected by a shaft coaxial to the turbine and to the casing of the device, to a rotation reversal member which is disposed at the top of the spray element and includes striker means which are accessible directly from the upper region of the device and are adjustable in position to set the size of the spray angle, wherein the feed means for the turbine, disposed below ths latter, include a lower plate carrying one or more nozzles of vertical axis parallel to the axis of the turbine and spaced radially from it, above them there being disposed a conveyor disc provided, in correspondence with each nozzle, with a pair of ducts which open upperly towards the turbine and have their axes oblique to the turbine axis in directions which produce mutually opposite directions of rotation of the turbine, the conveyor disc being rotatable between two positions, in which it makes one or other of the oblique ducts of each pair face the corresponding nozzle, a bistable elastic means being provided to maintain its assumed position, the conveyor disc also being connected to turn with the rotation reversal member at the top of the spray element.