Light responsive airflow register

Claim 1

In combination with an airflow register for an enclosure, said airflow register having control means to vary the volume of air being conducted through said register, said control means being movable between an open position and a closed position, with said control means in said open position air is to flow through said airflow register, with said control means in said closed position air is being prevented from flowing through said airflow register, said control means being connected to a first lever, said first lever being manually operable to move said control means between said open position and said closed position, the improvement comprising: light sensor means mounted within said enclosure, a motor, said light sensor means to cause operation of said motor, said control means being connected to a second lever, said second lever being operable separate from said first lever to move said control means between said open position and said closed position, said motor being connected to said second lever, said motor to move said control means through said second lever to said open position upon observable light being detected by said light sensor, said motor to move said control means through said second lever to said closed position upon an observable darkened environment being detected by said light sensor within said enclosure; and a flow limiter in the form of a plug insertable within a slot to prevent movement of said first lever completely to said one end of said slot thereby locating said control means in a partially open position permitting some flow of air through said register face panel.