Fire Door Frame With Segmented Clamshell Cases
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Solution Overview
Problem
Existing fire doors lack an economically assembled and cost-effective solution for achieving a fire rating that includes a large, non-welded, narrow, and easily manufacturable design with high smoke and flame stopping capabilities, while maintaining a fire-rated vision panel and frame.
Innovation Solution
A fire door design featuring a 'clamshell' frame member with metallic plates that do not conduct heat, a fire-resistant filler, and a holder for the vision panel, allowing for assembly without welding and using standard, cheaper components, along with a second frame member for capturing the vision panel and attaching door hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fire door assemblies are used with welded components, then structural strength and fire rating are achieved, but manufacturing cost increases and assembly complexity increases
Solution Approach 1:
The frame member is divided into multiple cases (first case, second case, third case) that are assembled together using fasteners rather than welded joints. Each case can be manufactured separately and then connected through the plate and fastener system, reducing manufacturing complexity and cost while maintaining structural integrity and fire rating.
Solution Approach 2:
A plate is introduced as an intermediary component between the cases. This plate serves as a mediator that connects the cases through fasteners, eliminating the need for direct welding between case components. The plate acts as a thermal break and structural connector, maintaining fire rating while simplifying assembly.
2Area of moving object
If a large vision panel is incorporated into the fire door, then visibility and aesthetic appeal improve, but fire rating maintenance becomes more difficult
Solution Approach 1:
The plate positioned between the cases serves as a localized fire-resistant element that compensates for the presence of the large vision panel. By concentrating fire protection at critical junction points (where the plate connects the cases), the design maintains overall fire rating while allowing extensive glazing areas.
Solution Approach 2:
The assembly combines multiple materials with complementary properties: the vision panel provides large-area transparency, while the fire-resistant cases, plate, and filler material provide fire protection. This composite construction allows both large vision panel area and maintained fire rating.
3Ease of manufacture
If metallic plates are used to connect frame components, then assembly without welding is achieved, but heat conduction across the frame increases
Solution Approach 1:
The plate is deliberately positioned to NOT contact the cases directly, extracting the heat conduction path from the structural connection. This allows the plate to serve its primary function as a mechanical connector for assembly without welding, while eliminating its secondary harmful effect of thermal conduction across the fire barrier.
Solution Approach 2:
The plate acts as a thermal intermediary that is intentionally isolated from the cases. By using fasteners that penetrate the plate rather than creating direct metal-to-metal contact between cases, the design uses the plate as a mediator that enables easy assembly while preventing heat conduction through proper detailing.
4Reliability
If multiple cases with open chambers are used in the frame member, then fire resistance is improved, but device complexity increases
Solution Approach 1:
The frame is segmented into multiple cases with open chambers that can be assembled together. While this creates a multi-component structure, each case is a simple, standardized element that can be manufactured efficiently. The segmentation allows fire resistance through compartmentalization while keeping individual components simple.
Solution Approach 2:
The cases serve multiple functions: they provide structural support, create fire-resistant chambers when assembled, and accommodate the vision panel. This multi-functionality reduces the need for separate components, effectively managing complexity by making each case do multiple jobs.
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
The design achieves a high fire rating with a large vision panel, reduced width, and simplified assembly, while being cheaper and more efficient to manufacture, effectively stopping smoke and flames, and allowing for easy cladding with various materials.
Implementation Method 1
A fire resistant filler is also positioned in the first and second chambers and may take the form of gypsum or like material
Implementation Method 2
The plates may be formed of metallic material and, lacking contact with the first and second cases, are not conducting heat across the first and second cases
Data Source
AI summary
A fire door utilizing a pair of frame members each having cases forming opposing open chambers. The open chambers are filled with fire resistant material and include structural plates that do not contact the cases. Holders attach to the cases support a fire resistant glazing unit.