Adapter for upright sprinkler with rotating head

A rotatable connection between a sprinkler head and the upper end of a water-transporting standpipe, comprising:

• a water fitting on the sprinkler head communicating with water flow passages in the sprinkler head;
• a water-transporting standpipe adapted to be disposed in an upright, substantially vertical orientation, the standpipe having an upper cylindrical end with threads formed on the outer surface thereof;
• an adapter comprising a cup-like base having an annular seal portion resting on an annular upper edge of the standpipe with an axial sealing fit, a male stem having a lower seal portion rotatably mounted in the cup-like base with a radial, rotatable seal with the base, and an oversleeve having a cylindrical bore sized to fit over the male stem and cup-like base, and having a lower threaded portion in the bore threadably engaging the threads formed on the outer surface of the upper end of the standpipe, the oversleeve bore having an internal portion axially engaging the cup-like base in the lower sealed portion of the male stem to axially secure the male stem in the cup-like base and to further secure the cup-like base against the upper annular edge of the standpipe such that the male stem is rotatably retained in the cup-like base inside the oversleeve, and further such that an upper end of the male stem extends above the oversleeve and is secured to the water fitting of the sprinkler head such that the sprinkler head is rotatable with the stem.

An adapter for connecting a sprinkler head in rotating fashion to a standpipe having a cylindrical upper end, comprising:

• a cup-like base having an annular seal portion adapted to rest on the cylindrical upper end of the standpipe in an axial sealing fit, an axial water passage, and an upwardly-opening cylindrical bore defining an annular axial bearing surface with a cylindrical radial sealing surface;
• a cylindrical male stem having a lower sealed portion inserted in the cylindrical bore and sized for rotation therein on the axial bearing surface with a seal against the radical sealing surface, and an upper end adapted for connection to a sprinkler head;
• an oversleeve having a bore sized to fit over the male stem and cup-like base and adapted to engage the upper end of the standpipe with an axial locking connection;
• and
• wherein the oversleeve bore has a lower, larger diameter diameter portion adapted to fit over an outer diameter of the standpipe, and an upper, smaller diameter portion engaging the outer surface of the male stem, and an annular shoulder axially engaging the lower sealed portion of the male stem in the cup-like base.

An adapter for connecting a sprinkler head in rotating fashion to a standpipe having a cylindrical upper end, comprising:

• a cup-like base having an annular seal portion adapted to rest on the cylindrical upper end of the standpipe in an axial sealing fit, an axial water passage, and an upwardly-opening cylindrical bore defining an annular axial bearing surface with a cylindrical radial sealing surface;
• a cylindrical male stem having a lower sealed portion inserted in the cylindrical bore and sized for rotation therein on the axial bearing surface with a sealing against the radical sealing surface, and an upper end adapted for connection to a sprinkler head;
• an oversleeve having a bore sized to fit over the male stem and cup-like base and adapted to engage the upper end of the standpipe with an axial locking connection;
• and
• wherein the cup-like base has a lower plug portion adapted to extend partway into the standpipe in contact with an inside wall of the upper end of the standpipe, and further wherein the base has an annular seal above the lower plug portion, the annular seal being adapted to axially engage an upper anngular edge of the standpipe when the lower plug portion is in the standpipe.