A spring clip is secured to a support at each end of a light fixture such as a fluorescent light fixture and the clip extends downwardly therefrom. It is provided with at least one projection which snap engages a bead formed on the upper end edges of a lens component thus detachably securing the lens...http://www.google.ca/patents/US4148095?utm_source=gb-gplus-sharePatent US4148095 - Lens holding means for light fixtures
