Patent ID: 7845425
Filing Date: 2010-12-07
Classification: A62C

Abstract:
1. A fire sprinkler with a built-in cutoff valve, comprising: a sprinkler housing having an externally threaded sprinkler nozzle disposed along a central axis, said externally threaded sprinkler nozzle having an activation plug disposed therein, said activation plug attached to a heat-sensitive rod disposed along the central axis, said externally threaded sprinkler nozzle having a distal end for connecting to a supply pipe and a proximal end connected to a pair of support arms, each support arm extending from the proximal end of the threaded sprinkler nozzle and terminating at a support annulus that is disposed along the central axis, said support annulus circumferentially attached to a deflector shield and said support annulus connected to a proximal end of an internally-threaded shroud, said shroud having a recessed opening at a distal end and a screw-valve disposed therein along the central axis, said screw-valve having a screw-head at a distal end and a cone plug at a proximal end, wherein the cone plug is moveable along the central axis from an open position to a closed position by turning the screw-valve and engaging the internal threads of the shroud, wherein at the open position that cone plug is disposed within the support annulus and the heat-sensitive rod is seated thereon to hold the activation plug in place within the externally threaded sprinkler nozzle, and wherein at a closed position the cone plug seals the proximal end of the externally threaded sprinkler nozzle and the heat-sensitive rod and the activation plug are ejected.