Down lighting systems and fixtures therefor

Claim 1

A light system for providing emergency lighting and regular illumination comprising: a housing including an open end and a closed end; the open end having a flange extending outwardly of said housing to permit insertion of the housing through the access hole and defining a retention surface engageable with the outer surface of the ceiling when the fixture is mounted on the ceiling to interlock the fixture and the outer surface of the ceiling; means connected to said closed end of the housing including a low profile conduit fitting that provides for connection of wires from a flexible conduit to socket means located inboard of said housing; first socket means connected inboard of the housing for connecting a first primary source of illumination to the wires for directing regular illumination to a space below said ceiling; second socket means connected inboard of the housing at a point offset from a vertical axis through said first socket means for connecting a secondary source of illumination to an emergency power source for directing emergency lighting from the open end of said housing so as to provide an emergency source of illumination in the space below said ceiling because of main power failure in the source of electrical power connected to said wires; and circuit means for connecting the second socket means to a source of emergency power when the power supply for the first primary source of illumination fails; said circuit means including a battery defining a rechargeable d.c. power source for emergency power, a battery charger having input terminals connected to the primary power source and outlet terminals for supplying charging current to said battery; a double pole, double throw relay having a first pair of contacts and a second pair of contacts; a movable armature means operatively connected to said first and second pair of contacts, a coil energized by the primary power source to attract said armature to position said first pair of contacts to supply charging current to said battery when the primary power source is on; spring means operative to position said armature means when said primary power source fails to condition said first pair of contacts to interrupt the charging current circuit and to condition said second pair of contacts to direct current from said battery to said second socket means so as to energize lamp means therein to provide emergency lighting; and an emergency test button connected to said armature and manually operative for overcoming the force of the coil on said armature means and to connect the secondary source of illumination to the battery for testing emergency lighting when the main power is on.