Patent ID: 8186448

Claim:
A pendent-type fire suppression sprinkler comprising: a sprinkler body defining an orifice along an orifice axis and an outlet generally coaxial with the orifice axis, the sprinkler body having a K-factor of about 25; a pair of arms disposed on a plane and extending from the sprinkler body; P 1 an apex supported by the pair of arms, the apex having an apex axis, a first end and a second end, the second end of the apex being wider than the first end, the apex having an outer peripheral surface extending between the first and second end, the apex axis being generally coaxial with the orifice axis; and a substantially planar deflector mounted to the apex for delivery of a quantity of fluid sufficient to suppress a fire in a stored commodity, the deflector having a first, inside surface opposed to the outlet, an opposite second outside surface, and a deflector axis generally coaxial with the orifice axis, the deflector having an outer peripheral edge with a plurality of slot openings defining a plurality of slots disposed about the deflector axis extending inward along a slot centerline to an innermost portion so as to define a slot length and at least an opposed pair of radial slots disposed in the plane and at least three radial slots disposed to one side of the plane, the plurality of slots including at least two groups of slots, the at least two groups of slots including a first group of slots having at least four slots disposed to one side of the plane with the innermost portion between the outer peripheral edge of the deflector and the outer peripheral surface of the apex and a second group of slots having at least two pairs of slots extending radially inward and having the innermost portion substantially aligned with the outer peripheral surface of the apex, each slot of the second group of slots having a slot length in the range of 0.52 inch to 0.62 inch.