Adjustable LED Lighting Unit with Sealed Pivot Seal
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Solution Overview
Problem
Adjustable lighting units face challenges in moist environments, fire resistance, thermal management, and manufacturing complexity, particularly with the risk of moisture seal dislodgement compromising their IP rating and requiring costly adhesive-based solutions.
Innovation Solution
A lightweight, sealed, and fireproof adjustable LED lighting unit design featuring a retaining member to secure the moisture seal, allowing for easy assembly and preventing dislodgement, combined with a fire-resistant housing and efficient thermal management through a heatsink and thermal paste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a steel can is applied over the entire lighting unit to prevent moisture ingress, then moisture protection is improved, but weight and cost increase
Solution Approach 1:
The patent divides the lighting unit into two separate parts: a static mounting structure and a movable internal structure. The moisture seal is applied only at the interface between these two parts, rather than requiring a steel can over the entire unit. This segmentation allows moisture protection to be achieved with minimal additional weight.
Solution Approach 2:
The patent extracts the moisture barrier function from a comprehensive steel can enclosure and implements it as a separate moisture seal component positioned only where needed - at the interface between the static and movable structures. This extraction eliminates unnecessary material while maintaining the moisture protection function.
2Reliability
If a large fire resistant can is mounted over the entire lighting unit to meet fire resistance requirements, then fire resistance is improved, but weight and cost increase
Solution Approach 1:
The patent segments the fire resistance requirement into two parts: the static mounting structure provides fire resistance for the ceiling aperture, while the movable internal structure is designed to maintain fire integrity when in the vertical position. This segmentation eliminates the need for a large fire resistant can over the entire unit.
Solution Approach 2:
The patent applies a dynamic approach to fire resistance by designing the internal structure to be movable within limited angles. The structure maintains fire integrity in the vertical position (providing fire resistance) but can pivot to limited angles for adjustment. This dynamic design eliminates the need for a static fire resistant can enclosing the entire unit.
3Reliability
If a fire resistant hood is placed over the entire lighting unit to meet fire resistance requirements, then fire resistance is improved, but thermal management deteriorates due to impeded air flow
Solution Approach 1:
The patent segments the fire resistance function from a comprehensive hood enclosure and implements it through the static mounting structure and the position-dependent internal structure. This segmentation allows unobstructed air flow paths to remain open while fire resistance is maintained where structurally necessary.
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 solution ensures a reliable waterproof seal, improved assembly process, reduced rejection rates, and effective thermal management while meeting fire resistance standards, making the lighting unit more efficient and cost-effective.
Implementation Method 1
a seal that seals the first part to the second part. The seal prevents moisture passing through the lighting unit via the gap between the first and second parts
Implementation Method 2
a fire resistant member arranged to prevent fire penetration through the aperture in the partition
Implementation Method 3
efficient thermal management through a heatsink and thermal paste
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A lighting unit including a first part (3) having a mounting structure (5) that is arranged for insertion into an aperture in a partition, such as a ceiling or wall; a second part (9) including at least one solid state lighting device (15) and a support arranged to support the at least one solid state lighting device, wherein the second part (9) is pivotable with respect to the first part (3); and a seal (21) arranged to seal the first part (3) to the second part (9). The seal (21) is arranged to deform to accommodate pivoting movement of the second part (9) with respect to the first part (3), wherein the seal (21) includes a membrane having an outer peripheral portion (91) that sealably engages to the first part (3), an inner peripheral portion (89) that sealably engages to the second part (9), a flexible connector portion (78) connecting the outer peripheral portion (91) to the inner peripheral portion (89), and a retaining member (94) arranged to hold the outer peripheral portion (91) in contact with the first part (3).