Polymer Housing for Recessed Lighting Assembly
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Solution Overview
Problem
Existing recessed lighting systems are cumbersome to assemble and expensive due to excessive use of materials and labor, with metal housings limiting design flexibility and increasing costs, and failing to meet safety standards efficiently.
Innovation Solution
A polymer-based recessed lighting system with a housing designed using injection molding techniques, incorporating structural features like ribs for strength, and featuring a yoke and partition plate for easier installation, which reduces the number of components and simplifies assembly while meeting safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal housings are used in recessed lighting systems, then structural strength is improved, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent combines multiple separate metal components (housing, mounting pan, junction box, conduit bodies) into a single integrated polymer housing. This unification eliminates the need for assembling multiple metal parts, reducing assembly complexity while maintaining structural integrity through the polymer material's inherent properties and integrated rib reinforcement structures.
Solution Approach 2:
The patent employs polymer composite materials that provide structural strength comparable to metal while enabling easier manufacturing and assembly. The polymer housing incorporates internal rib structures and gussets that reinforce strength without requiring thick walls or multiple components, thus reducing assembly complexity.
2Strength
If thicker metal housing is used to provide structural integrity, then strength is improved, but material cost increases
Solution Approach 1:
The patent applies local reinforcement through strategically placed ribs and gussets in the polymer housing. Instead of uniformly thickening the entire housing to achieve structural integrity, the design concentrates material only where needed for strength, reducing overall material usage and cost while maintaining required structural performance.
Solution Approach 2:
The polymer material provides adequate structural strength without requiring the thickness needed for metal housings. The material's inherent properties allow for thinner walls combined with internal reinforcement features, reducing material quantity and cost while achieving the same structural integrity.
3Reliability
If multiple components are used in recessed lighting systems, then functional requirements are met, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent integrates multiple previously separate components into a single polymer housing unit. The housing incorporates mounting features, junction box functionality, conduit body integration, and structural support elements all in one piece, eliminating the need for multiple discrete parts and their associated assembly steps.
Solution Approach 2:
The polymer housing serves multiple functions simultaneously: it provides structural support, acts as a junction box for electrical connections, includes integrated mounting features for installation, and incorporates conduit bodies for wire routing. This multi-functionality in a single component reduces the total number of parts while meeting all functional requirements.
4Ease of manufacture
If conventional sheet metal forming is used, then manufacturing process is simple, but design flexibility for variable thickness is limited
Solution Approach 1:
The injection molding process enables the polymer housing to have variable wall thickness in different locations, allowing material to be concentrated where structural reinforcement is needed (ribs, gussets) and reduced where it is not required. This design flexibility is not achievable with conventional sheet metal forming, which requires uniform thickness.
Solution Approach 2:
The patent utilizes the ability of injection molding to vary material parameters (thickness, density, reinforcement placement) throughout the housing structure. This allows optimization of structural integrity and material usage by changing local material properties during the manufacturing process, providing design flexibility unavailable in sheet metal forming.
Data Source
AI summary
A recessed lighting system includes multiple components formed from a polymer to reduce the number of components in the system, lower the cost of manufacture, and simplify the installation of the recessed lighting system. In one example, a recessed lighting system includes a housing formed from a polymer, a hanger bar assembly, a light module, and a trim. A yoke may be installed into the housing to provide greater accessibility to mount the light module and/or trim to the housing. A partition plate may be installed to push back wires/cables disposed in the housing such that the cavity of the housing is divided into a wiring compartment containing the wires/cables and a lighting compartment containing the light module and the trim. A hanger bar assembly may also be coupled to the housing to couple the recessed lighting system to a building structure (e.g., a T-bar, a joist, a stud).