| 主权项 |
1. A seismic vertical support suspension apparatus to suspend a ceiling grid between a first wall and a second wall that is parallel to and spaced a distance apart from the first wall comprising:
a suspension system interposed between the first wall and the second wall and including a pair of tracks supported from the respective confronting surfaces of the first wall and the second wall and opening inwardly toward one another; a plurality of transversely projecting metal seismic joists spaced apart along the tracks, each of said seismic joists comprising hollow tubular steel beams; a plurality of hangers, each of which comprises a metal hanger bracket rigidly affixed to a vertical-steel angle projecting downwardly from the metal hanger bracket, and having an upper extremity and a lower extremity; wherein said metal hanger brackets are rigidly carried from the respective seismic joists and each of the downwardly projecting rigid vertical-steel angles acts as a lever arm and is connectable to the ceiling grid; and wherein said metal hanger brackets, having respective interiors and exteriors, said respective exteriors abutting one side of the upper extremities of the respective rigid vertical angles, the respective interiors of the metal hanger brackets defining C-shaped bites that are configured to engage in close fit relationship over the top and bottom sides of each of the respective seismic joists. |
