Abstract: In the particular embodiments disclosed in the specification, a residential sprinkler arrangement includes a sprinkler body with an axial passage having an outlet opening providing a K factor of about 4 to about 6 which is normally closed by a cap retained in position by a thermally responsive element and a planar deflector spaced from the outlet opening and supported from the sprinkler body by a pair of frame arms. The deflector has a circumferential array of peripheral slots, a first set of which, located in the plane of the frame arms, has a length greater than that of any of the other slot-like openings and a second set of which, located in the plane perpendicular of the plane of the frame arms, has a length less than that of the first set but greater than that of any of the other slots.

Abstract: In the typical embodiments described in the specification, a sprinkler arrangement for protecting stored documents has a sprinkler body with an orifice providing a K factor in the range from about 1.1 to about 2.7, a pair of frame arms terminating in a boss from which a glass bulb supports a cap in position to seal the orifice in the passage, and a pair of closely spaced substantially planar deflector members having a peripheral edge spacing in a range from about 0.01 inch to about 0.60 inch. The deflector member closer to the axial passage has a plurality of slots permitting some water to pass into the space between the deflector members where it generates a very fine droplet mist and some water to be distributed outwardly in the form of fine droplets to carry the mist away from the sprinkler. A recess formed in the surface of the second deflector member facing the first deflector member provides a cavity which promotes atomization and generates turbulence.

Abstract: In the typical embodiments described in the specification, a sprinkler arrangement for protecting stored documents has a sprinkler body with an orifice providing a K factor in the range from about 1.1 to about 2.7, a pair of frame arms terminating in a boss from which a glass bulb supports a cap in position to seal the orifice in the passage, and a pair of closely spaced substantially planar deflector members having a peripheral edge spacing in a range from about 0.01 inch to about 0.60 inch. The deflector member closer to the axial passage has a plurality of slots permitting some water to pass into the space between the deflector members where it generates a very fine droplet mist and some water to be distributed outwardly in the form of fine droplets to carry the mist away from the sprinkler. A recess formed in the surface of the second deflector member facing the first deflector member provides a cavity which promotes atomization and generates turbulence.

Abstract: In the particular embodiment disclosed in the specification, a sprinkler has a sprinkler body with a passage having an orifice providing a K factor of about 3 to 6 which is normally closed by a cap retained in position by a glass bulb thermally responsive element. A deflector spaced from the orifice and supported from the sprinkler body by a pair of frame arms has a circumferential array of tines separated by radial slot-like openings and two openings located in the plane in the frame arms have a length greater than that of the other slot-like openings while four openings located at 45° to the plane of the frame arms are shorter than the other openings. The openings in the plane of the frame arms have a width of about 25% to 75% of the width of the frame arms adjacent to the deflector and a root diameter of about 150% to 300% of the width of the frame arms adjacent to the deflector.

Abstract: In a particular embodiment disclosed in the specification a sprinkler has a sprinkler body with a passage having an orifice which is normally closed by a cap retained in position by a glass bulb thermally responsive element and a deflector spaced from the orifice and supported from the sprinkler body by a pair of arms. The deflector has a circumferential array of tines separated by openings and the openings located in the plane in the frame arms have a substantially teardrop shape with the larger end closer to the sprinkler axis having a width which is 120% to 160% of the width of the adjacent portions of the frame arms.