Seismic Suspended Ceiling Panels with Mechanical Locking
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Solution Overview
Problem
Suspended ceiling systems with T-bar lattices are prone to failure during earthquakes due to unsecured ceiling tiles and fixtures, which can lead to safety hazards and increased installation costs, especially in seismic and mobile environments, and they require costly plenum-rated wiring and conduits for electrical installations.
Innovation Solution
The use of ceiling panels with an upper frame installed on T-bar grids and a reversibly attached lower frame that mechanically locks the T-bar flanges in place, creating channels to secure the tiles and allow for non-plenum-rated wiring and plug-in connections without the need for conduits or junction boxes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If T-bar suspension system is used for ease of installation and access, then installation simplicity is improved, but seismic safety deteriorates due to unsecured tiles
Solution Approach 1:
The ceiling system is divided into modular ceiling panels that can be independently installed and removed. Each panel is a self-contained unit with integrated securing mechanisms, allowing the system to maintain simplicity while improving seismic resistance through modular design.
Solution Approach 2:
The ceiling panels are pre-assembled with frames and securing mechanisms before installation. The lower frame is attached to the upper frame in advance, creating a pre-configured secure unit that can be quickly installed without complex on-site assembly, thus maintaining ease of installation while ensuring seismic safety.
2Reliability
If retention clips are installed to secure tiles, then seismic resistance is improved, but ease of access deteriorates due to labor-intensive installation
Solution Approach 1:
The securing mechanism is merged into the ceiling panel assembly itself. The lower frame is reversibly attached to the upper frame as an integrated unit, combining the ceiling tile and securing mechanism into a single component that maintains both seismic resistance and ease of access.
Solution Approach 2:
The lower frame attachment mechanism is designed to be reversible, allowing it to transition between locked and unlocked states. This dynamic capability enables the system to provide secure attachment during seismic events while allowing easy removal when access is needed, eliminating the trade-off between security and accessibility.
3Reliability
If plenum-rated wiring and conduits are used for electrical installations, then safety is improved, but installation cost deteriorates
Solution Approach 1:
The electrical wiring is extracted from the plenum space above the ceiling and relocated to run within the ceiling panel structure itself. The frames and channels of the ceiling panels provide dedicated pathways for wiring, eliminating the need for expensive plenum-rated materials while maintaining safety through physical containment.
Solution Approach 2:
The ceiling panel frames and channels serve as an intermediary structure that provides safe wiring pathways. Instead of requiring specialized plenum-rated wiring to protect against fire spread through the air space, the solid frame structure acts as a natural barrier, allowing the use of standard wiring materials.
Data Source
AI summary
The invention provides suspended or “dropped” ceiling systems based upon the use of standard inverted T-bar lattices. The ceiling panels are constructed from two pieces which, when assembled in place, capture the T-bar in a manner that prevents the panels from shaking loose. A suspended ceiling assembled with the panels of this invention will withstand the forces of an earthquake without experiencing panel drop-outs, and the ceiling will remain intact so long as the T-bars remain suspended from the structural ceiling above. The panels of the invention can, in preferred embodiments, carry lighting fixtures, and the required wiring can be installed and concealed below the T-bars rather than within the plenum space.