Patent ID: 6138924
Filing Date: 2000-10-31
Classification: B05B

Abstract:
A sprinkler unit, comprising:an upwardly opening generally cylindrical vertically extending mounting case adapted for subterranean location, the case having a lower smaller diameter section forming a pressure vessel with an inlet, an upper larger diameter section forming a sprinkler housing, and a female threaded segment at a junction of the upper and lower sections;a pop-up rotor-type sprinkler including an upper end cap, an upper riser retraction spring retainer adjacent the end cap, a cylindrical riser vertically extensible through a central opening in the upper end cap, a lower riser retraction spring retainer fixed to the riser, and a riser retraction spring surrounding the riser between the upper and lower retainers; anda generally cylindrical vertically extending adaptor sleeve surrounding the riser and coupled at an upper end thereof to the end cap and having a lower end with a male threaded segment screwed into the female threaded segment of the cylindrical mounting case at a junction of the upper and lower sections.