Seismic-Resistant Ceiling Perimeter Pocket With Cam Clips
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Solution Overview
Problem
Existing perimeter pocket systems for ceiling construction are inadequate for seismic areas, lacking modularity, ease of installation, and seismic resistance, and do not facilitate proper grid tee positioning.
Innovation Solution
A perimeter pocket system with a seismic-resistant design featuring a reinforced inner pocket wall, adjustable extensions, and connector clips with a cam mechanism to maintain grid tees above the ledge during seismic events, along with reference marks for precise installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional perimeter pocket systems are used, then installation is simpler, but they lack seismic resistance and cannot prevent grid tees from colliding with the ledge during seismic events
Solution Approach 1:
The pocket leg is divided into multiple segments including an upper pocket leg, lower pocket leg, and intermediate section. This segmentation allows each part to be optimized for specific functions: the upper portion provides seismic resistance while the lower portion maintains compatibility with traditional installation methods, resolving the contradiction between improved reliability and device complexity.
Solution Approach 2:
The invention introduces a cam mechanism that operates in a different dimensional space (rotational movement) to control the grid tee's vertical position. The cam's rotational movement translates into vertical displacement of the grid tee, preventing collision with the ledge during seismic events without significantly complicating the overall system structure.
2Adaptability or versatility
If fixed-height pocket systems are used, then manufacturing is simpler, but they cannot be readily modified in height to suit particular installations
Solution Approach 1:
The pocket leg is segmented into modular sections (upper pocket leg, lower pocket leg, intermediate section) that can be manufactured separately and assembled in different configurations. This allows the system to be produced using standardized manufacturing processes while enabling height customization through selective assembly, resolving the contradiction between adaptability and ease of manufacture.
3Strength
If the inner pocket leg is directly mounted against the wall, then support is simpler, but it cannot withstand horizontal forces imposed by the ceiling during seismic events
Solution Approach 1:
The mounting structure is segmented into multiple components including the pocket leg assembly, bracing elements, and connection mechanisms. This segmentation allows the distribution of seismic forces across multiple structural elements rather than relying on a single direct wall mounting, enabling the system to withstand horizontal forces while maintaining a relatively simple overall structure.
Solution Approach 2:
Bracing elements are introduced as intermediary components between the pocket leg and the wall structure. These bracing elements serve as mediators that transfer and distribute horizontal seismic forces, enhancing the system's strength without requiring direct complex mounting arrangements.
4Reliability
If grid tees are allowed to move freely during seismic events, then flexibility is maintained, but they collide with the ledge causing damage
Solution Approach 1:
The cam mechanism is pre-configured in the pocket leg structure to automatically engage with the grid tee and prevent downward movement that would cause collision with the ledge. This preliminary action is built into the structure during manufacturing, allowing the damage prevention function to operate automatically without adding complexity to the installation process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures stable ceiling grid installation in seismic zones by preventing grid tees from colliding with the ledge, reducing assembly errors, and enhancing seismic resilience.
Implementation Method 1
Seismic connector clips of the invention have an extended grid tee supporting leg including a cam for raising an associated tee when the tee is displaced in a seismic event
Implementation Method 2
The trim engaging part also has an integral element resiliently deflected in a channel when the clip is turned upright, said resilient element releasably locking the clip against a reversal of said movement
Data Source
Figure 1
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Figure 5~6A
AI summary
A perimeter pocket system with an inner wall having a brace connecting protuberance and an extended ceiling supporting ledge with grid tee end reference marks or coupling structure for an extension. Grid tee connector clips have cam slots for raising grid tees in a seismic event and features imparting rigidity and vibration resistance.