Importance

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Abstract

An upright-type fire protection sprinkler with a body defining an orifice and outlet for flow of fluid, and a deflector positioned coaxial with the outlet for impingement of fluid flow thereupon, has one or a combination of the following features for improved performance. The deflector may have an inner surface with a recessed central area, and a recessed redirecting area about the central area at a predetermined acute angle and axial offset thereto. The deflector has tines with inner surfaces inclined towards the outlet, at least a first set of tines disposed in planes at about 45.degree. to a first plane of sprinkler frame arms, the surfaces of the first set of tines being inclined at an angle relatively more outward from the axis than the angle of inner surfaces of adjacent tines. The tines may include a second set of tines in a plane perpendicular to the first plane, and a third set of tines in the first plane, inner surfaces of the second set of tines having a second set width and inner surfaces of the third set of tines having a third set width about 0.15 to 0.65 times the second set width. The second set width may be substantially greater than widths of inner surfaces of all other tines.

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First Claim