Patent ID: 8430339
Filing Date: 2013-04-30
Classification: B05B,F16L

Abstract:
1. A sprinkler head riser apparatus for an in-ground sprinkler system, the apparatus comprising: an extendible pipe assembly comprising first and second pipe portions each having an interior through which sprinkler fluid can flow; a sprinkler head assembly attached to the extendible pipe assembly for receiving the sprinkler fluid and discharging the sprinkler fluid from the sprinkler system, the sprinkler head assembly comprising a top surface; a cylinder having an end wall and an open end, said cylinder being connected to the first pipe portion ; and a piston received in slidable and sealable engagement with said cylinder, said piston being connected to the second pipe portion, wherein said piston, cylinder and end wall define a first chamber; said first chamber being adapted to receive a first control fluid from a source exterior to the sprinkler head riser apparatus, said first control fluid when received in said first chamber displacing said piston relative to said cylinder to vary a distance between an end of the first pipe portion and an end of the second pipe portion and raise the top surface of the sprinkler head assembly relative to surrounding ground while permitting fluid communication between the first and second pipe portions; wherein said first chamber, and the first control fluid therein, is fluidly isolated from the first and second pipe portions, as well as from the sprinkler fluid flowing through the first and second pipe portions for discharge from the sprinkler system.