| 摘要 |
A lighting fixture having a unitary, combination pan-like, wrap-around housing integrally formed with a refractor lens of high-impact plastics material. The housing is hermetically sealed to a heat-dissipating cast metal plate of the fixture through the medium of a resilient sealing bead interposed and mechanically confined between a base flange extending outwardly of bounding side walls of the housing and a face of the base plate at a marginal zone thereof. The housing is stressingly urged againast the sealing bead by means of housing and plate-carried inter-engaging tabs and slots in conjunction with threaded bolts exending through side walls of the housing and matingly engaging threads in bores formed in posts integrally formed with the base plate. The bores are angled so as to effect a positive displacement of the housing toward, to seal with the base plate during threaded advance of the bolts into the threaded bores of the base plate. The fixture houses twin parabolic reflectors and the housing also encloses and protects the reflectors as well as all of the electrical components of the fixture, including ballasts. The latter are mounted on solid metallic pedestals integrally formed with the cast base plate, and constituting heat sinks for dispelling heat generated in the ballasts during energization of the fixture.
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