Fire-Rated Recessed Lighting Fixture with Ventilation Trim
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Solution Overview
Problem
Existing recessed lighting fixtures face challenges in effectively preventing fire spread due to their complexity and high cost, with ventilation holes potentially contributing to fire acceleration and only partial fire inhibition in the main housing.
Innovation Solution
A one-piece casing made of fire-retardant material, secured to a ceiling, with a flange fitting assembly and a light-emitting diode (LED) assembly mounted to the flange fitting, eliminating the need for ventilation holes and reducing overall cost and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ventilation holes are included in the housing to prevent overheating, then heat dissipation is improved, but fire spread risk increases
Solution Approach 1:
The patent removes the harmful ventilation holes from the housing structure entirely. Instead of modifying the housing with openings, the invention extracts the ventilation function and relocates it to a separate trim component that can be positioned away from the fire-containing housing, thus eliminating the fire spread pathway while maintaining heat dissipation capability
Solution Approach 2:
The patent introduces an intermediary approach by separating the ventilation function from the fire-containing housing. The trim acts as an intermediary component that provides ventilation pathways away from the fire source, mediating between the need for heat dissipation and the requirement to contain fire within the housing
2Reliability
If multiple safety components are included to achieve fire resistance, then fire retardancy is improved, but device complexity increases
Solution Approach 1:
The patent merges the fire-resistant housing and ventilation trim into a simplified two-component system. Rather than incorporating multiple separate safety mechanisms (intumescent materials, fire barriers, ventilation controls), the invention combines fire containment in the housing with ventilation functionality in the trim, reducing overall system complexity while maintaining fire retardancy
Solution Approach 2:
The housing serves multiple functions simultaneously: it contains the fire source, provides structural support, and when combined with the ventilating trim, enables heat dissipation. This multi-functionality reduces the need for separate dedicated safety components, simplifying the overall device
3Reliability
If fire-resistant materials and mechanisms are added to the housing, then fire resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the lighting fixture into modular components (fire-resistant housing, ventilating trim, bulb holder) that can be manufactured separately using standard processes and assembled later. This segmentation allows each component to be produced efficiently without requiring expensive specialized manufacturing, while the combination achieves the desired fire resistance
Data Source
AI summary
A recessed lighting fixture includes a one-piece casing having i) a flat-crown-hat-shaped to be secured to a ceiling or the like and that is made of a fire-retardant material, ii) a flange fitting that is removably mounted to the one-piece casing therein, and iii) a light-emitting diode (LED) assembly mounted to the flange fitting therein.