| 摘要 |
<p>A light bar (20) for mounting on an emergency vehicle to provide warning light signals, comprising at least two vertically spaced lighting layers, each layer having at least one light source, the light sources on each layer cooperating to provide a transient high intensity warning light signal 360 DEG around the light bar. The light bar (20) may include oscillating light sources. A casing (152) encloses the light sources, and a divider (210) separates the light sources of at least two of the layers (28,30) and divides the casing into at least two vertically spaced layers. The divider (210) includes means for permitting air convection between the layers while blocking direct light transmission from the light sources on one layer to the other layer. The casing (152) comprises upper and lower shell members (154,156) which interfit to horizontally compress a gasket to seal the casing without screws or other fasteners penetrating the shells. The light bar (20) preferably includes a hollow tube extending substantially the length of the light bar (20), for mounting the light sources. The tube may be formed by upper and lower channel shaped members. A plurality of stationary lights can be incorporated into one of the layers of the light bar (20), and electronically controlled to provide traffic directing signals.</p> |
