Patent ID: 6530531
Filing Date: 2003-03-11
Classification: B05B

Abstract:
A pop-up sprinkler comprising:a housing with a lower end for connection to a water supply; an opening in the lower end to permit the flow of water into the housing; an opening in an upper end opposite the lower end; a riser slidably and rotatably engaged within the housing and in the opening in the upper end of the housing to substantially close the upper end; a spring between the housing and the riser to bias the riser to a retracted position in the housing; a spray nozzle in an upper end of the riser; a flow passage in the riser to allow water to flow from the housing to the nozzle; surface area on the riser sufficient to cause the riser to move upwardly against the force of the spring to move the nozzle outwardly of the housing when water of a predetermined pressure enters the housing through the opening in the lower end of the housing; an annular riser flange extending from the riser within the housing toward the housing and having a radial thickness with teeth about the circumference thereof; tabs associated with the housing which engage circumferential teeth of the annular riser flange to hold the riser in a selected position with respect to the housing when the riser is manually rotated to a selected position with respect to the housing; and slots extending radially inwardly from the circumference of the annular riser flange a distance less than the radial thickness of the flange and sufficient to reduce the rigidity of the flange to ease movement of the flange with respect to the engaging tabs.