Concealed horizontal sidewall sprinkler

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;
• and
• a deflector assembly disposed within the housing, the deflector assembly including a deflector plate, said deflector assembly being movably supported relative to the sprinkler body,
• wherein the heat responsive trigger includes a soldered element assembly and at least one lever that engages an inner shoulder of the housing and at least one aperture of the soldered element assembly, the inner shoulder defining a distal opening of the housing,
• 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,
• wherein the peripheral wall extends at least partially within at least a portion of the housing,
• wherein the peripheral wall comprises at least one slot, and
• wherein the at least one lever is disposed through the at least one slot.