Appeal No. 1998-2376 Page 2
Application No. 08/400,325
institutional and commercial settings where they are subject
to periodic cleaning and maintenance.
Heretofore, extruded housings for linear direct-indirect
lighting fixtures have been fabricated in extruded, co-linear
aluminum parts held together by cross braces to provide a
linear lighting fixture of a desired length. The cross braces
held the extruded parts in parallel such that parallel
openings ran the length of the housing over which elongated
light screens having a desired perforation or aperture pattern
were placed to prevent viewers from looking directly into the
interior of the fixture. The screens were made in perforated
sections of sheet metal or plastic and were attached to
adjacent co-linear housing elements by spring clips. Such a
multiple-part construction was relatively cumbersome to
assemble, however, and required a large inventory of parts.
Furthermore, unsightly seams appeared along the edges and
between the ends of abutting light screens thereby leaking
light.
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