Patent ID: 8646539

Claim:
A sprinkler comprising: a body having a proximal portion and a distal portion, the body defining an internal passageway having an inlet and an outlet extending along a longitudinal axis, the distal portion including an annular wall having an outer surface and an inner surface to further define a chamber distal of the outlet and in communication with the passageway, a portion of the annular wall further defining a distal opening in communication with the chamber; a deflector assembly coupled to the body, the deflector assembly including a deflector plate disposed within the chamber, the deflector plate having a first position distal of the outlet and a second position distal of the first position; a closure assembly including a closure element engaged with the deflector plate such that when the deflector plate is in the first position the closure element is disposed within the outlet of the passageway; and a trigger assembly including: a lever assembly engaged with an inner surface of the annular wall to support the deflector assembly in the first position; and a thermally rated plate assembly having at least a first plate member including a lip portion framing the first plate member, the plate assembly being engaged with the lever assembly such that the lip portion substantially circumscribes an outer portion of the annular wall defining the distal opening.