Patent ID: 8485270

Claim:
An early suppression fast response pendent-type fire protection sprinkler comprising: a sprinkler body defining an orifice and an outlet for delivering a flow of fluid from a source, and having a K-factor of about 25; a pair of opposed arms disposed on a plane, each of the arms having a first end extending from the body and a second end distal the body; an apex joined to the second end of each of the arms, the apex having a first end and a second end, the second end being wider than the first end, the apex having an outer peripheral surface extending between the first and second end; a plug that closes the outlet of the body; a thermally responsive element that supports the plug; and a deflector having a central deflector axis, the deflector being coupled to the apex so that the second end of each of the arms is disposed between the deflector and the outlet of the body with the apex being centrally disposed along the deflector axis and the second end of the apex adjacent the deflector, the deflector having a first surface opposed to the flow of fluid from the outlet to deflect the flow of fluid to address a fire in at least one of a single row rack storage, double row rack storage and multiple row rack storage having a maximum storage height of up to about 40 feet in a storage area having a maximum ceiling height of up to about 45 feet, the deflector defining at least two grouping of slots disposed about the deflector axis, each of the at least two grouping of slots having at least two slots, each of the slots in each of the at least two grouping of slots extending from the first surface through the deflector, and from slot openings at an outer peripheral edge of the deflector inwardly to a radially innermost portion of the slot so as to define a slot length extending along a slot centerline, the slot length of the slots in one grouping varying from the slot lengths of the slots in another grouping of the at least two grouping of slots, each slot of one grouping of the at least two groupings of slots having a first width generally transverse to the slot centerline of the slot in the one grouping, each slot of another grouping of the at least two groupings of slots having a second width transverse to the slot centerline of the slot in the other grouping and different than the first width, one grouping of the at least two grouping of slots having at least four slots disposed to one side of the plane, and another grouping of slots having a pair of opposed radial slots disposed in the plane and three radial slots disposed to one side of the plane, at least one pair of slots of one grouping of the at least two groupings of slots having the innermost portion no further outward from the deflector axis than the peripheral surface of the apex, each slot of the other grouping of slots having the innermost portion further outward from the deflector axis than the peripheral surface of the apex.