Resettable Automatic Soffit Vent for Ember and Flame Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing soffit vents in fire-prone areas either require manual closure, which is impractical during rapid forest or brush fires, or use intumescent materials that destroy the vent upon activation, necessitating replacement and lacking manual reset functionality.
Innovation Solution
A soffit vent design featuring a metal tray with stainless steel mesh and a sliding mechanism, actuated by tension springs and a thermal link that automatically closes upon heat exposure, allowing manual operation and reset without destroying the vent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If intumescent materials are used to automatically close the vent upon heat exposure, then the vent closes automatically to prevent ember and flame entry, but the vent is destroyed and cannot be reused
Solution Approach 1:
The patent divides the vent into separable components: a reusable vent body and a replaceable thermal fuse assembly. This segmentation allows the automatic closure mechanism (thermal fuse) to be replaced without destroying or replacing the entire vent, resolving the contradiction between automation and reusability.
Solution Approach 2:
The patent employs a disposable thermal fuse assembly that is inexpensive to replace. The thermal fuse is designed to be consumed during automatic closure, but since it is a separate, replaceable component, the overall system remains reusable. This resolves the contradiction by making the sacrificial element cheap and replaceable rather than destroying the entire vent.
2Extent of automation
If the vent is designed to automatically close using intumescent materials, then flame entry is prevented, but the vent cannot be manually reset or reopened
Solution Approach 1:
The patent designs the vent to serve multiple functions: it can automatically close via thermal fuse activation, and it can also be manually opened and closed using an actuation mechanism. This multi-functionality resolves the contradiction by allowing the vent to provide both automatic protection and manual control as needed.
Solution Approach 2:
The patent implements a dynamic system where the vent can switch between automatic and manual operation modes. The removable thermal fuse assembly allows the system to transition from an automatic state (when fuse is attached) to a manually controllable state (when fuse is removed or replaced), providing adaptability.
3Reliability
If manual closure of soffit vents is required during forest or brush fires, then ember entry can be prevented, but the rapid movement of fires makes manual closure impractical
Solution Approach 1:
The patent implements a self-service automatic closure mechanism where the thermal fuse automatically detects heat from approaching fires and triggers vent closure without human intervention. This eliminates the response time issue by having the system protect itself automatically when needed.
Solution Approach 2:
The patent replaces the manual mechanical closure system with an automated thermal response system. The thermal fuse uses thermal energy detection to automatically actuate the closure mechanism, substituting human-operated mechanical systems with an automated thermo-mechanical system that responds instantaneously to fire conditions.
4Reliability
If the entire vent is replaced after automatic closure activation, then functionality is restored, but time and resources are wasted
Solution Approach 1:
The patent segments the vent into a permanent reusable body and a consumable thermal fuse assembly. This allows only the small, inexpensive thermal fuse to be replaced rather than the entire vent, dramatically reducing restoration time and resource expenditure while maintaining full functionality.
Solution Approach 2:
The patent implements a design where only the thermal fuse assembly is discarded after activation, while the main vent body is recovered and retained for continued use. This selective discarding approach minimizes waste and restoration time by preserving the reusable components.
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 vent effectively prevents ember and flame entry into attics during fires while allowing manual control and cost-effective restoration by replacing only the thermal link after automatic closure, maintaining functionality for both automatic and manual operation.
Implementation Method 1
A first tension spring is attached at one end to an end wall of the tray and at its other end to the slide. A latch bar is fixed at one end to the opposite end wall of the tray and extends inwardly therefrom to a distal end. A linkage is attached at one end to the distal end of the latch bar and is attached at its other end to an end of a thermal link, creating a thermal link assembly.
Implementation Method 2
A first tension spring is attached at one end to an end wall of the tray and at its other end to the slide
Data Source
AI summary
An ember and flame resistant resettable automatic soffit vent includes a tray with ventilation openings formed in its floor. A mesh screen resides on the floor of the tray spanning the ventilation openings. A flat slide resides atop the screen and also has ventilation openings that match those of the tray. The slide has an open position wherein its ventilation openings align with those of the tray to allow airflow through the vent and a closed position wherein its ventilation openings are misaligned with the ventilation openings of the tray to close off airflow through the vent. The vent can be manually moved between its open and closed positions and one or more tension springs and a thermal link assembly cooperate to move the slide to its closed position if the vent is exposed to a high temperature cause by a fire very near a home. The vent also can be manually closed by a homeowner when a fire is threatening and then manually reopened when the fire threat passes without destroying the automatic closing feature of the vent.