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;

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

a deflector assembly including a deflector plate and a button secured to an upstream side of the deflector plate, said deflector assembly being movably supported to the sprinkler body by at least one arm, said button defining an aperture that extends unobstructed all the way through the button from an upstream side to a downstream side, wherein said button includes a flange portion that is staked within an aperture in the deflector plate and the aperture extends through the flange portion.

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

3. The concealed sprinkler according to claim 2 , wherein said plurality of slots are disposed within a planar portion that is generally perpendicular to a center axis of the flow passage and the deflector further includes a canopy portion that is generally parallel to the center axis.

4. The concealed sprinkler according to claim 1 , wherein the aperture in the button is disposed along a center axis of the flow passage.

5. The concealed sprinkler according to claim 1 , wherein the aperture in the button is angled with respect to a center axis of the flow passage.

6. The concealed sprinkler according to claim 1 , wherein the aperture in the button is split into multiple passages.

7. The concealed sprinkler according to claim 1 , wherein an exit end of the aperture in the button is elongated in a lateral direction.

8. The concealed sprinkler according to claim 1 , wherein the aperture in the button is tapered.

9. A concealed sprinkler, comprising:

a sprinkler body having a flow passage therethrough with an inlet end and an outlet end;

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

a deflector assembly including a deflector plate and a button secured to an upstream side of the deflector plate, said deflector assembly being movably supported to the sprinkler body by at least one arm, said button defining an aperture that extends unobstructed all the way through the button from an upstream side to a downstream side;

wherein the heat responsive trigger includes a pair of levers that each engage a housing mounted to the sprinkler body, a lever bar and a respective aperture in a soldered element assembly, the 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.

10. A concealed sprinkler, comprising:

a sprinkler body having a flow passage therethrough with an inlet end and an outlet and;

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

a deflector plate supported to the sprinkler body by a pair of pins, said deflector plate including a central portion including a plurality of tines extending from a first side and a canopy disposed generally perpendicular to the central portion and being supported to the central portion by only a single central support portion;

wherein the heat responsive trigger includes a pair of levers that each engage a housing mounted to the sprinkler body, a lever bar and a respective aperture in a soldered element assembly, the 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.