Abstract: A light bar incorporates an extruded base and top panel where the top panel is supported above the base by two ruggedly constructed electronics enclosures. The base top panel and electronics enclosures form a structure to which various light units, lenses and covers are attached to form the finished light bar. The top panel is one of the last components to be installed, leaving the internal components of the light bar accessible during assembly. Each electronics enclosure may surround a power supply that includes a heat-generating component, such as a power transistor. Each enclosure is provided with an opening through which the heat-generating component protrudes to form a heat transfer interface with a heat sink plate mounted to the outside of the enclosure. A further heat transfer interface is formed between the heat sink plate and the top panel in the assembled light bar.

Abstract: A tip up light bar assembly includes front and rear light bars pivotally supported above transversely opposed end assemblies joined by connector bars to form a rigid support structure. Each light bar is built on a rigid substrate having a uniform cross section. Longitudinally extending features of the rigid substrate provide locations for mounting light sources, electronic assemblies and lenses which, together with gaskets, define a weather-resistant enclosure surrounding the light sources and electronic assemblies. The light bars pivot at transversely opposed ends to a vertical position in which the light sources are elevated above traffic. Each end assembly includes a base plate, a pivotally mounted pivot plate. A gas spring reduces the dead weight of the light bar while a limit strap controls angular movement of the light bar relative to the base plate to approximately 90°. A motor-drive actuator exerts outward force on the pivot plates to move the light bars between a horizontal and vertical position.