Vandal-Resistant Lighting Fixture With Tortuous Groove Interface

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Solution Overview

Problem

Lighting fixtures in detainment facilities and unmonitored spaces are vulnerable to vandalism, allowing gaps that can be exploited for hiding contraband or self-harm, creating ligature points.

Innovation Solution

A vandal-resistant lighting fixture design featuring a flange with an extension that fits into a groove in the housing cover, creating a tortuous path to prevent object insertion and mitigate ligature risks, while using adhesive layers for additional protection and impact resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a traditional lighting fixture design is used, then the fixture is easy to manufacture and install, but gaps between components create ligature points and allow object insertion for vandalism or self-harm

Engineering Contradiction:

Improveligature pointsVSAvoidfixture structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The flange extension is designed with a curved, non-linear geometry that forces any inserted object to follow a tortuous path. The curved surfaces and angled interfaces prevent direct linear insertion, making it impossible to wedge objects between the flange and housing cover for ligature purposes.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The design adds a dimensional complexity to the interface between components. Instead of a simple flat-to-flat interface, the flange extension protrudes into the housing cover with multi-directional surfaces that create a three-dimensional tortuous path, preventing object insertion from a single direction.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Object-affected harmful factors

If gaps are present between lighting fixture components, then the fixture is easier to assemble, but these gaps allow contraband hiding and self-harm activities

Engineering Contradiction:

Improvecontraband hidingVSAvoidassembly ease

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The lighting fixture is divided into distinct segments (housing, flange, housing cover) that are designed to interface with each other. The flange extension acts as an intermediary element that segments the potential gap space, creating multiple small interfaces rather than one large continuous gap, thereby preventing object insertion while maintaining assembly feasibility.

Inventive Principle:

Principle #1Segmentation

3Strength

If adhesive layers are added for additional protection, then impact resistance and ingress protection are improved, but manufacturing complexity increases

Engineering Contradiction:

Improveimpact resistanceVSAvoidmanufacturing process

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The adhesive layers serve multiple functions simultaneously: they provide mechanical bonding between components, add impact resistance by creating a cushioning layer, and maintain IP66 ingress protection by sealing gaps. This merging of multiple protective functions into a single material layer simplifies the overall manufacturing process compared to adding separate components for each function.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12590690B2Lighting fixture

Publication Date: 2026.03.31 ABL IP HLDG LLC

AI summary

A vandal resistant light may include a housing having a first end and a second end, the first end opposite the second end, a lighting assembly disposed at the first end of the housing, a cover disposed at the second end of the housing, the cover includes a continuous uninterrupted groove, and a flange including an extension configured to be at least partially received within the continuous uninterrupted groove.