초록 ▼

A lighting unit adapted to provide a sealed closure in an opening in a Clean-Room ceiling includes a housing which supports one or more light emitting means and has a perimeter structure for supporting the housing in place over the ceiling opening, and a substantially impermeable light diffuser seal

A lighting unit adapted to provide a sealed closure in an opening in a Clean-Room ceiling includes a housing which supports one or more light emitting means and has a perimeter structure for supporting the housing in place over the ceiling opening, and a substantially impermeable light diffuser sealingly mounted to the housing by a peripheral frame. A perimeter gasket is retained between and sealingly engages perimeter surfaces of the frame and the opening in the ceiling, and a reversibly adjustable retention device supports the frame and housing together to cause the gasket to sealingly engage the perimeter surface of the frame and the opening in the ceiling. The lighting unit is adapted to prevent or abate leakage of filtered, conditioned air from a room, e.g., a Clean-Room, and is adapted to prevent or abate infiltration of unfiltered, contaminated air into the room from the space above the ceiling.

대표청구항 ▼

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] A lighting unit for use in the ceiling of a Clean-Room to provide a sealed closure for an opening in said ceiling, comprising:a housing which at least partially encloses and suppor

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] A lighting unit for use in the ceiling of a Clean-Room to provide a sealed closure for an opening in said ceiling, comprising:a housing which at least partially encloses and supports one or more light-emitting elements, said housing having an upper extremity which includes unsealed seams through which ambient air above said ceiling may communicate, and a lower extremity defining an opening which affords access to said light-emitting elements and through which said elements emit light into said Clean-Room;a perimetral frame extending around said opening defined by said lower extremity of said housing, said frame disposed in alignment with said housing lower extremity and with the opening in said ceilinga substantially imperforate light diffuser having a size and shape generally corresponding to said opening defined by said housing lower extremity and disposed over said housing lower extremity opening to cover said housing lower extremity opening,said perimetral frame having first portions extending under said diffuser to mount said diffuser in place over said housing lower extremity opening and also having second portions defining a perimeter larger than said ceiling opening to underlie said ceiling around said opening;a perimeter seal extending around and operatively disposed between adjacent surfaces of said perimetral frame first portions and said light diffuser, and a perimeter gasket adapted to extend between and sealingly engage said ceiling and at least one of said second portions of said perimetral frame and said housing around the ceiling opening; anda releasable fastener for holding said perimetral frame, said light diffuser and said housing together with said perimeter gasket compressively clamped in sealing disposition against said ceiling, whereby said lighting unit provides a continuous peripherally sealed closure of the opening in said ceiling which is releasable for ready access to said light-emitting elements.