| 摘要 |
<p>POP-UP SPRINKLER A pop up sprinkler having a housing including an inlet for receiving water under pressure and a spray nozzle assembly mounted with respect to the housing for vertical sliding movement between a retracted position generally within the housing and an elevated position with its upper end elevated above said housing. An apparatus is disposed within said housing and movable with said assembly for grippingly engaging the assembly to prevent the assembly from rotating with respect to the housing when the assembly is in its elevated position, and for releasing the assembly to permit the assembly to rotate with respect to the housing throughout at least a portion of the vertical movement of said assembly below said elevated position.</p> |
