Low Profile Downlight Trim Ring Assembly Mechanism
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Solution Overview
Problem
The assembly and installation of compact LED-based light fixtures, especially those designed for flush mounting on surfaces like ceilings, are complicated due to their compact size and design, which poses challenges in securing the lens and housing effectively.
Innovation Solution
A low-profile downlight design featuring a housing with a planar surface, a PCB with LEDs, a lens, and a trim ring with bendable metal tabs that securely engage the housing and lens, allowing for easy assembly and installation by sliding and locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LED-based lighting devices are made compact to blend into ceiling spaces, then the lighting fixture can fit into smaller spaces and blend better, but the assembly and installation becomes more complicated
Solution Approach 1:
The lighting fixture is divided into separate modular components: a housing containing the LED array, a lens, a trim ring, and mounting elements. This segmentation allows each component to be manufactured independently and assembled in a simplified sequence, resolving the complexity issue while maintaining compact overall dimensions.
Solution Approach 2:
The patent employs nested positioning where the lens is received within the housing, the trim ring encircles the lens and housing assembly, and mounting clips nest within the housing structure. This nested arrangement consolidates multiple components into a compact footprint while providing straightforward assembly through sequential insertion.
2Length of stationary object
If the lighting fixture is designed with a low profile for flush mounting, then it can be installed on flat surfaces like ceilings, but securing the lens and housing effectively becomes challenging
Solution Approach 1:
The housing is pre-configured with recesses, ridges, and engagement features that automatically align and secure the lens and trim ring during assembly. The mounting clips are pre-formed with spring characteristics that provide automatic engagement, eliminating the need for complex fastening operations while ensuring reliable securing in the low-profile configuration.
Solution Approach 2:
The patent utilizes flexible mounting clips and spring-loaded retention elements that can deform during assembly and then maintain constant securing force. These flexible elements compensate for minor dimensional variations and ensure reliable securing of the lens and housing without increasing the profile depth.
3Length of stationary object
If the trim ring is made thin to maintain low profile, then the overall depth is reduced, but the structural strength for securing components may be compromised
Solution Approach 1:
The trim ring is designed with non-uniform thickness distribution, featuring thicker sections at critical engagement points where tabs interface with the housing and where the inwardly projecting lip contacts the lens. The body portions between these critical points can be thinner, maintaining overall low profile while ensuring structural strength where needed.
Solution Approach 2:
The trim ring incorporates composite construction combining rigid materials for structural integrity with flexible elements for securing functions. This composite approach allows the thin trim ring to maintain sufficient strength for securing components while preserving the low-profile design requirement.
Data Source
AI summary
A low profile lighting device for installation on a flat surface such as a ceiling. The low profile down light can have a housing comprising a generally planar surface and a sidewall rising from the planar surface; a PCB with a plurality of LEDs affixed to the generally planar surface of the housing; a lens in contact with the sidewall of the housing and having a first side facing the LEDs on the PCB such that light from the LED illuminates the first side of the lens; and a trim ring adapted to slide over the housing and having a first end and a second end opposite the first end, wherein the first end has a plurality of tabs adapted to secure the trim ring to a housing and the second end has an inwardly projecting lip adapted to contact the second side of the lens thereby securing the lens to the housing.