Fire Door Edge Guard and End Cap for Excessive Clearance
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Solution Overview
Problem
Existing fire door assemblies often fail inspections due to excessive gaps between the fire door and frame, leading to non-compliance with fire safety codes, as the wood edges burn away quickly in a fire, leaving no interface with the frame.
Innovation Solution
A U-shaped channel edge guard and beveled end cap system is installed on fire doors to protect edges and correct excessive clearances, using PEM fasteners for secure attachment without specifying left or right-handed doors, ensuring compliance with fire safety codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fire door assemblies are built to minimum standards, then manufacturing cost is reduced, but excessive gaps exist between door and frame leading to inspection failure
Solution Approach 1:
The patent introduces an intermediary component (edge guard system with U-channel and end caps) that bridges the gap between the door and frame. This mediator absorbs the clearance excess and provides the necessary overlap, allowing doors built to minimum standards to achieve compliance without rework or expensive precision manufacturing.
Solution Approach 2:
The edge guard system is segmented into multiple components (U-channel, end caps, fasteners) that can be independently manufactured and assembled. This segmentation allows for easier manufacturing of each component to standard tolerances while achieving the precise overall fit required for compliance.
2Device complexity
If wood edges are left unprotected, then device complexity is reduced, but wood edges burn away quickly in fire leaving no interface with frame
Solution Approach 1:
The edge guard system performs preliminary protection by covering the wood edges before fire exposure. The metal U-channel and end caps are pre-installed to protect the vulnerable wood edges, preventing them from burning away and maintaining the door-frame interface throughout the fire rating period.
Solution Approach 2:
The system combines different materials (metal edge guards with wood door edges) to achieve properties that neither material alone could provide. The metal provides fire resistance and structural stability while the wood provides the door's primary function, creating a composite edge structure that meets fire safety requirements.
3Reliability
If gaps between door and frame are reduced to meet codes, then fire safety compliance is improved, but installation difficulty increases
Solution Approach 1:
The edge guard system provides dynamic adjustment capability through its design that accommodates varying clearance conditions. The system can be adapted to different door and frame configurations, allowing installers to achieve code compliance regardless of the specific clearance measurements, simplifying the installation process.
Data Source
AI summary
An edge guard system for use with a fire door assembly to installed on a fire door is disclosed. The edge guard system includes a U-shaped channel edge guard that is sized and configured to fit over and to be secured to at least on edge of a fire door. The edge guard includes a first part of a fastener assembly to fasten an end cap to at least one end of the edge guard. The edge guard system also includes at least one end cap sized and configured to fit and be fastened to one end of the edge guard. The end cap includes a second part of the fastener assembly.