Lawn sprinkler

A sprinkler apparatus comprising:

• a base configured to attach to a fluid source, the base defining a volume therein, the base defining an inlet which extends into the base to the volume, the inlet being positioned at a bottom end of the base;
• a riser mounted to the base, the riser being movable between a retracted configuration and an extended configuration with respect to the base, the riser being positioned substantially in the volume of the base when in the retracted configuration, the riser extending upwardly from and with respect to the base when in the extended configuration, the riser being telescopically extendable from the retracted configuration to the extended configuration, the riser comprising an upper segment and a lower segment, the upper segment and the lower segment being positioned in the base when the riser is in the retracted configuration, the lower segment extending between the upper segment and the base when the riser is in the extended configuration, the riser being biased toward the retracted position;
• a sprayer rotatably coupled to an upper end of the upper segment of the riser, the sprayer comprising a hub and a plurality of spoke tubes, the plurality of spoke tubes being coupled to and extending outwardly from the hub, the hub defining a first inlet and a second inlet opposite each other, the first inlet and the second inlet being in fluid communication with each spoke tube of the plurality of spoke tubes, each spoke tube of the plurality of spoke tubes having an outlet opposite the hub, the sprayer being rotatable about a horizontal axis with respect to the base which extends through the hub, each spoke tube of the plurality of spoke tubes being curved from the hub in a first rotational direction around the hub, the first rotational direction extending around the horizontal axis of the sprayer;
• wherein the upper segment of the riser defines a first channel and a second channel, the first inlet of the sprayer being in fluid communication with the volume of the base via the first channel, the second inlet of the sprayer being in fluid communication with the volume of the base via the second channel, the first channel having a bore size which is greater than a bore size of the second channel, an outlet of the first channel and an outlet of the second channel being oriented to direct fluid away forwardly with respect to the upper segment of the riser, the outlet of the first channel being positioned above the outlet of the second channel;
• a biasing assembly coupled to the riser and biasing the riser toward the retracted configuration, the biasing assembly comprising an upper compression spring and a lower compression spring, the upper compression spring being positioned between a bottom flange of the upper segment of the riser and a top inner surface of the lower segment of the riser, the lower compression spring being positioned between a lower flange of the lower segment of the riser and a top interior surface of the base;
• and
• a rotation mechanism operatively coupled to the upper segment of the riser, the rotation mechanism being configured to rotate the upper segment about a vertical axis extending through a top end and the bottom end of the base, the rotation mechanism comprising a turbine mounted in the upper segment and a gearbox operatively coupled to the turbine, the gearbox being operatively coupled to a rotary portion of the upper segment, the sprayer being mounted to the rotary portion.