A deflector plate for a heat responsive fire protection sprinkler, the deflector plate comprising hourglass shaped slots

摘要

595887 A deflector (32) for a fire protection sprinkler, comprising a deflector body including upper and lower planar surfaces and a peripheral edge (36). A plurality of slots (40, 42, 44, 46) extends radially inward from the peripheral edge. At least two of said plurality of slots have a first outer portion (40a), a second intermediate portion (40b) adjacent the first outer portion and a third inner portion (40c) located radially inward from the second intermediate portion. The first outer portion includes a pair of parallel sidewall portions having a first width (D1) between said pair of parallel sidewall portions being parallel in a direction that is also parallel to said upper and lower planar surfaces. The second intermediate portion has a second width (D2) less than said first width. The third inner portion has a third width (D3) greater than said second width.