Abstract: A pop-up sprinkler unit for mounting beneath the surface of a soil formation includes an outer cylindrical housing for subsurface mounting, with an inner housing carrying a nozzle and drive turbine with a protective sleeve of a grit resistant material reciprocally mounted between the inner and outer housings for extending with the inner housing up through a portion of the soil for deflecting grit from between the sleeve and housing when the inner housing and sleeve is retracted.

Abstract: An adjustable pressure check valve comprises a generally cylindrical body having a throughbore communicating with an inlet and an outlet at opposite ends thereof, an annular valve seat in the throughbore, a valve member having a sealing surface for engagement with the seat disposed in the bore for movement into and out of engagement with the seat, a compression spring disposed in the throughbore for biasing the valve member into engagement with the seat, and an adjusting member for adjusting the biasing force of the spring on the valve member.

Abstract: A rotary stream sprinkler unit comprises a housing having a water flow passage in which is disposed a flow control unit having one or more passages configured to control the volume and pressure of a stream, which strikes and rotates a self-propelled rotary distributor head rotatably mounted at the outlet of the housing for dividing each stream into a plurality of final streams, and rotating each of the final streams through a selected arc during the rotation of the rotary head, with a pressure compensated damping device in the housing connected to the rotary head by means of a shaft supported by a resilient member at the outlet for controlling the rotational velocity thereof.

Abstract: A rotary stream sprinkler unit comprises a body having a water flow passage in which is disposed a flow control unit having one or more arcuate passages configured to control the volume and pressure of a primary stream delivered to a rotary distributor head rotatably mounted at the outlet of the housing for dividing each primary stream into a plurality of final streams and rotating each of the final streams through a selected arc during the rotation of the rotary head.

Abstract: A gear driven oscillating sprinkler head includes a reversible gear train for transmitting drive from a drive motor to the oscillating sprinkler head with a shifting mechanism, including a shiftable carrier on which a pair of driving pinions are mounted for shifting alternately into driving engagement with an internal ring gear, with a lost motion connection between a shifting arm and the carrier with a cam controlled shift retainer unit for maintaining the carrier in its engaging position until positively shifted by a shifting arm and over-center springs for biasing and maintaining the shifting arm to the alternate driving engagement positions.

Abstract: A rotary stream sprinkler unit comprises a housing having a water flow passage in which is disposed a flow control unit having one or more passages configured to control the volume and pressure of a stream, which strikes and rotates a self-propelled rotary distributor head rotatably mounted at the outlet of the housing for dividing each stream into a plurality of final streams, and rotating each of the final streams through a selected arc during the rotation of the rotary head, with a damping device in the housing connected to the rotary head by means of a shaft supported by a resilient member at the outlet for controlling the rotational velocity thereof.

Abstract: A rotary stream sprinkler unit comprises a body having a water flow passage in which is disposed a flow control unit having a variable restriction in a passage to one or more arcuate passages configured to control the volume and pressure of a primary stream delivered to a rotary distributor head rotatably mounted at the outlet of the housing for dividing each primary stream into a plurality of final streams and rotating each of the final streams through a selected arc during the rotation of the rotary head.

Abstract: A rotary stream sprinkler unit comprises a body having a water flow passage in which is disposed a multi-passage flow control unit having a plurality of passages, each configured to control the volume and pressure of a stream with multiple outlets at the outlet end of the housing, and a rotary distributor cap rotatably mounted at the outlet of the housing for rotating each of the outlet streams through a selected arc during the rotation thereof.

Abstract: A rotary stream sprinkler unit comprises a body having a water flow passage in which is disposed a flow control unit having one or more arcuate passages configured to control the volume and pressure of a primary stream delivered to a rotary distributor head rotatably mounted at the outlet of the housing for dividing each primary stream into a plurality of final streams and rotating each of the final streams through a selected arc during the rotation of the rotary head.

Abstract: A sprinkler unit having a continuously rotating nozzle includes a stream interruptor comprising a pin mounted on a carriage pivotally mounted on the nozzle and a cam surrounding the nozzle that has a series of cam surfaces for intermittently caming the carriage assembly and the interrupting pin into the stream to periodically interrupt the stream as the nozzle rotates about its axis to cause a more even distribution of water over the surface area surrounding the sprinkler unit.

Abstract: A reversible sprinkler unit includes a stream interruptor that includes a finger that moves into the stream for interrupting it on one direction of rotation of the nozzle and moves out of the stream on the other direction of rotation of the nozzle.

Abstract: A pop-up sprinkler unit for mounting beneath the surface of a soil formation includes an outer cylindrical housing for subsurface mounting with an inner housing carrying a nozzle and drive turbine with a protective sleeve of a grit resistant material reciprocably mounted between the inner and outer housings for extending with the inner housing up through a portion of the soil and includes a grit deflector on the housing surrounding the sleeve for deflecting grit from between the sleeve and housing when the inner housing and sleeve is retracted.

Abstract: A rotary stream sprinkler unit comprises a body having a water flow passage in which is disposed a flow control unit having one or more passages configured to control the volume and pressure of a stream which strikes and rotates a rotary distributor head rotatably mounted at the outlet of the housing for dividing each stream into a plurality of final streams and rotating each of the final streams through a selected arc during the rotation of the rotary head with a damping device connected to the rotary head for controlling the rotational velocity thereof.

Abstract: A two-stage pop-up sprinkler unit includes a cylindrical housing having a first telescoping sleeve reciprocably mounted in the housing and a second sleeve telescoping mounted within the first sleeve and containing the sprinkler head and driving mechanism, the first sleeve extending from the housing first for clearance of the ground surface and the second sleeve extends from the first sleeve with the head cleared to begin distributing water.

Abstract: A gear driven oscillating sprinkler head includes a reversible gear train for transmitting drive from a drive motor to the oscillating sprinkler head with a shifting mechanism, including a shiftable carrier on which a pair of driving pinions are mounted for shifting alternately into driving engagement with an internal ring gear, with a lost motion connection between a shifting arm and the carrier with separate over-center spring units for separately biasing the carrier and shifting arm to the alternate driving engagement positions.

Abstract: A compact swimming pool cover handling system including a pair of stationary roller support members, a roller for attaching the pool cover, and a hydraulic power attenuator for operation of the system. The hydraulic power attenuator includes controls for reversing directions of the roller without removing the source of liquid operating the device.

Abstract: A reversible turbine driven sprinkler unit includes a sprinkler head incorporating a nozzle that is continuously driven by a reversible turbine which continuously oscillates the head between selectable reversing stops for covering a selected part of a circle. A water turbine which is driven by the water supply to the nozzle includes a reversible stator for alternating the direction of rotation of the turbine which is drivingly connected through a gear train to the sprinkler head. A reversing mechanism includes a shifting shaft extending axially from the turbine stator through the turbine, the drive train and the sprinkler head terminating in a cylindrical cavity formed in the top of the sprinkler head in which it is positioned, in an adjustable position, reversing stops for alternately engaging a reversing arm mounted on the shifting shaft for shifting the stator of the turbine to its selected alternate positions.

Abstract: An adjustable orifice sprinkler unit includes a tubular body member with a rotatable cap mounted on one end thereof that cooperates with peripheral edges of the tubular body member for defining an adjustable arc spray orifice for adjusting a spray pattern from an angle of from about 0 degrees up to about 360 degrees with the cap adjustable axially of the tubular body member for selectively adjusting the height of the orifice opening.

Abstract: A gear driven oscillating sprinkler head includes a shifting gear train for transmitting drive from a drive motor to the oscillating sprinkler head with a shifting mechanism for shifting alternate driving pinions into driving engagement with an internal ring gear with the pressure angle of the engaging teeth being different for the different drive pinions to thereby balance the shifting force applied by the shifting mechanism.

Abstract: Improvements in sprinkler systems having fluid under pressure flowing therethrough and a sprinkler head with a pop-up nozzle actuated by fluid pressure. An impeller is actuated by the fluid flow to rotate the nozzle and thus rotate the spray of fluid therefrom. A transmission is disposed between the impeller and the nozzle for transmitting rotation of the impeller to the nozzle. The transmission is sealed off from the fluid passing through the system by a resilient expandable diaphragm at one end. A fluid pressure responsive seal is provided in the system in sealing engagement with the nozzle. The sealed-off portion of the transmission is completely filled with a lubricating medium which is free to selectively contract or expand against the diaphragm in response to varying ambient conditions encountered by the sprinkler head. The nozzle may also include means for varying the pattern of the sprayed fluid and may be comprised of molded plastic components which may be assembled together.