US Patent 10940347 Concealed horizontal sidewall sprinkler

A concealed sprinkler includes a sprinkler body having a flow passage therethrough with an inlet end and an outlet end. A closure device is secured at the outlet end of the flow passage by a heat responsive trigger. A deflector assembly includes a deflector plate and a button secured to an upstream side of the deflector plate. The deflector assembly is movably supported to the sprinkler body by at least one arm. The button defines an aperture that extends unobstructed all the way through the button from an upstream side to a downstream side.