US Patent 7624813 Mount for covering fire sprinkler head

The fire sprinkler head comprises a water supply pipe including a pipe and a joint coupling to the pipe and forming a connecting end opposite to the pipe; a mount including a cavity formed on the top thereof and adapted to receive the connecting end, a hole defined on the bottom of the cavity, an edge surrounding the hole with a first end and a second end, a recess defined between the first and the second end of the edge and a housing; a nozzle device defining a first end with exterior threads adapted to engage the edge of the mount to the connecting end of the water supply pipe, a second end having an engaging portion and a nozzle, and a hollow; a cover device including a cover, an opening formed in the center of the cover and a plurality of lugs around the opening.