Concealed horizontal sidewall sprinkler

1. A concealed sprinkler, comprising:

a sprinkler body having a flow passage therethrough with an inlet end and an outlet end disposed along a center axis;

a closure device secured at the outlet end of the flow passage by a heat responsive trigger;

a housing surrounding the closure device;

a deflector assembly disposed within the housing, the deflector assembly including a deflector plate and a button secured to the deflector plate, said deflector assembly being movably supported relative to the sprinkler body by at least one pin,

wherein the heat responsive trigger includes a soldered element assembly and a pair of levers that each engage an inner shoulder of the housing and an aperture of the soldered element assembly, the inner shoulder defining a distal opening of the housing, the distal opening having an opening width transverse the center axis,

wherein the soldered element assembly comprises a terminal wall transverse to the center axis and a peripheral wall contiguous the terminal wall, the peripheral wall being disposed along the center axis toward the deflector assembly and about the pair of levers, the peripheral wall defining a soldered element assembly width transverse the center axis less than the opening width of the distal opening,

wherein the peripheral wall extends at least partially within at least a portion of the housing and forms an air gap between an inner shoulder of the housing and an outer surface of the peripheral wall so that the air gap provides air flow from an environment external to the housing into an interior of the housing,

wherein the air gap extends along the center axis, and

wherein the air gap comprises a single annular air gap disposed between the inner shoulder of the housing and about a circumference of the outer surface of the peripheral wall so that an entirety of the peripheral wall is spaced from the housing and a terminal end of the peripheral wall is freestanding within the housing;

wherein the terminal end of the peripheral wall is located between the inner shoulder and the deflector assembly.

2. The concealed sprinkler according to claim 1 , wherein said button includes a flange portion that is staked within an aperture in the deflector plate.

3. The concealed sprinkler according to claim 1 , wherein said deflector plate includes a plurality of slots extending inward from a periphery thereof.

4. The concealed sprinkler according to claim 3 , wherein said plurality of slots are disposed within a planar portion that is perpendicular to the center axis, and wherein the deflector further includes a canopy portion that is parallel to the center axis.

5. The concealed sprinkler according to claim 1 , wherein said button defines an aperture that extends unobstructed all the way through the button from an upstream side to a downstream side of the deflector plate, and wherein the aperture in the button is disposed along the center axis of the flow passage.

6. The concealed sprinkler according to claim 1 , wherein said button defines an aperture that extends unobstructed all the way through the button from an upstream side to a downstream side of the deflector plate, and wherein the aperture in the button is angled with respect to the center axis of the flow passage.

7. The concealed sprinkler according to claim 1 , wherein said button defines an aperture that extends unobstructed all the way through the button from an upstream side to a downstream side of the deflector plate, and wherein the aperture in the button is split into multiple passages.

8. The concealed sprinkler according to claim 1 , wherein said button defines an aperture that extends unobstructed all the way through the button from an upstream side to a downstream side of the deflector plate, and wherein an exit end of the aperture in the button is elongated in a lateral direction.

9. The concealed sprinkler according to claim 5 , wherein the aperture in the button is tapered.

10. The concealed sprinkler according to claim 1 , wherein the heat responsive trigger further comprises a lever bar having a threaded aperture receiving a set screw, said set screw being further received in a recessed cavity in an end of the button.