Rotary water sprinkler

Claim 1

A water sprinkler of the rotary type including a pressure stabilizing device, comprising outer and inner tubular members displaceable relative to each other over a substantial portion of the axial length of said inner member, means for coupling the inner member to a water supply source, means coupling the outer member to a spray nozzle, said inner tubular member terminating in an axially enlongated outlet conduit having at least one outlet port extending axially along said outlet conduit, a centrally apertured throttle member rigidly secured to said outer member for rotation therewith, said conduit member extending through said throttle member, biasing means for biasing said tubular members in a first direction, increasing the area of said at least one port, said outlet conduit being oriented in a direction such that water flowing from said outlet conduit into said outer tubular member urges said tubular members in a direction opposite said first direction, progressively to throttle the flow of water out of said outlet port, the degree of throttling increasing with increased separation of said members, means for relatively rotating said tubular members responsive to flow of water through said nozzle, and complemental rotary bearing means interposeD between said tubular members, the areas of engagement of said bearing means being relatively shifted in an axial direction responsive to said displacement of said members, whereby the wear resulting from said relative rotation is distributed over an extended area.