Anti-ligature Lighting Fixture Beveled Inset Door
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Solution Overview
Problem
Existing lighting fixtures with inset doors are not suitable for anti-ligature or ligature resistant environments due to gaps between the door and the enclosure, which can create ligature vulnerability points.
Innovation Solution
A lighting fixture with an inset door featuring a beveled edge or surface along its outer periphery, eliminating any channel or access point between the door and the enclosure, thereby preventing objects from being wedged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If an inset door lighting fixture is used, then maintenance access is improved, but ligature vulnerability increases due to gaps between the door and enclosure
Solution Approach 1:
The patent applies asymmetry by using a beveled edge design where the door edge is angled relative to the enclosure surface, creating a non-uniform gap that prevents ligature formation while preserving maintenance access. The bevel creates a triangular gap geometry that is inherently resistant to ligature use.
Solution Approach 2:
The patent transitions from a two-dimensional flat door surface to a three-dimensional beveled edge structure. This dimensional change creates a wedge-shaped gap that eliminates horizontal ligature pathways while maintaining vertical access for maintenance personnel.
2Object-affected harmful factors
If an overlapping door lighting fixture is used, then ligature vulnerability is reduced, but maintenance access deteriorates
Solution Approach 1:
The patent applies local quality by making the bevel angle adjustable or variable in different regions. The bevel angle can be modified locally to optimize both ligature resistance and maintenance access requirements for specific installation environments.
Solution Approach 2:
The patent introduces dynamics by allowing the door to move between a closed position (providing ligature resistance) and an open position (providing maintenance access). The hinge mechanism enables dynamic positioning of the door to satisfy different operational requirements.
3Object-affected harmful factors
If a beveled edge design is used, then ligature resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the door assembly into separate components: the door panel, the beveled edge profile, and the mounting frame. This allows the beveled edge to be manufactured as a separate extruded profile and then assembled, simplifying the manufacturing process while maintaining ligature resistance.
Solution Approach 2:
The patent applies parameter changes by allowing the bevel angle to be varied within a range (e.g., 15-45 degrees) depending on specific installation requirements. This flexibility enables optimization of both ligature resistance and maintenance access without requiring complete redesign of the manufacturing process.
Data Source
AI summary
A lighting fixture arranged and configured for use in an anti-ligature or ligature resistant environment or facility is disclosed. In one embodiment, the lighting fixture includes an inset door The lighting fixture includes an angled or beveled edge, wall, or surface along an outer periphery of the inset door so that a beveled, enlarged triangular opening is formed between the inset door and the enclosure of the lighting fixture. In use, the beveled opening eliminates any channel or access point between the inset door and the enclosure in which an object may be wedged.