Patent ID: 8376061

Claim:
A fire protection sprinkler, comprising: a sprinkler body having a fluid passage extending therethrough, said fluid passage having an inlet end and an outlet end; a plug member disposed in said fluid passage; a heat responsive unit releasably securing said plug member in said fluid passage; at least one frame arm extending from said sprinkler body; and a deflector mounted to said at least one frame arm, said deflector including upper and lower planar surfaces and a peripheral edge including a plurality of slots extending radially inward from said peripheral edge, at least two of said plurality of slots having a first outer portion including a pair of parallel sidewall portions having a first diameter therebetween said pair of parallel sidewall portions being parallel in a direction that is also parallel to said upper and lower planar surfaces, a second intermediate portion adjacent said first outer portion and having a second diameter less than said first diameter and a third inner portion radially inward from said second intermediate portion and having a third diameter greater than said second diameter.