Ligature-Resistant Wall Hook with Rotating Tab Release Mechanism
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Solution Overview
Problem
Existing hooks, both wall-mountable and flexible, fail to prevent ligature formation and support in environments where ligature resistance is crucial, as they either lose flexibility or allow penetration, posing a hazard in institutional settings.
Innovation Solution
A ligature-resistant wall-mountable hook design featuring a baseplate with a rotating tab and a restoring-force-providing member that maintains the tab in an upward position, preventing ligature formation until a threshold weight is exceeded, at which point the tab rotates to release the ligature, combined with a cover that directs loops outward to prevent attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible hook made from bendable rubber or plastic is used, then the hook can be mounted on various surfaces, but it eventually loses flexibility and may still support a ligature if flexibility is lost or the mounting portion is penetrated
Solution Approach 1:
The hook employs a dynamic rigid structure that rotates around a pivot point rather than relying on material flexibility. The rigid tab can pivot between a retained position (holding the article) and a released position (dropping the article), providing adaptability through motion rather than material flexibility. This resolves the contradiction by maintaining ligature resistance while achieving mounting versatility through a different mechanism.
Solution Approach 2:
The invention changes the operational parameter from material flexibility to rotational motion. Instead of the hook material bending and returning to shape, the rigid tab changes its angular position around a pivot point. This parameter change allows the hook to adapt to different mounting scenarios while maintaining consistent ligature resistance properties throughout its operational range.
2Strength
If a rigid hook is used to support substantial weight, then the hook can hold personal items, but it cannot be used in environments where ligature support is a hazard
Solution Approach 1:
The rigid hook structure is made dynamic through the ability of the tab to rotate around a pivot point. When a ligature is applied, the restoring force mechanism causes the tab to rotate to a released position, automatically dropping the ligature. This transforms a static rigid structure into a dynamic one that can respond to harmful conditions, resolving the contradiction between strength and ligature safety.
Solution Approach 2:
The restoring force mechanism is pre-configured to counteract ligature formation before it can be fully established. When a ligature is attempted, the restoring force acts in advance to rotate the tab and release the ligature, preventing the harmful effect from taking hold. This preliminary anti-action resolves the contradiction by proactively neutralizing the ligature hazard while maintaining weight support capability.
3Reliability
If the rotating tab extends upward at an angle of at least 30 degrees from perpendicular, then loops are held securely, but the cover must extend outward at exceeding 30 degrees to prevent ligature attachment
Solution Approach 1:
The cover employs asymmetric geometry with different extension angles on different sides. The cover extends outward at angles exceeding 30 degrees from the perpendicular direction to create a specific ligature-preventing profile, while the tab extends upward at at least 30 degrees for loop retention. This asymmetric design resolves the contradiction by using geometric variation to simultaneously achieve secure retention and ligature prevention without requiring complex mechanisms.
Solution Approach 2:
The cover's exterior profile uses curved surfaces that extend outward at specific angles to guide and prevent ligature attachment. The curved geometry works in conjunction with the angular extensions to create a smooth ligature-preventing profile, resolving the contradiction between simple geometry and effective ligature prevention while maintaining the required tab extension angle for secure loop retention.
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 hook effectively prevents ligature formation and support by rotating to release loops exceeding a threshold weight, ensuring safety in environments where ligature resistance is necessary, while maintaining functionality for personal items below the threshold weight.
Implementation Method 1
a restoring-force-providing member for restoring the rotating tab to an upward position
Implementation Method 2
a restoring-force-providing member for restoring the rotating tab to an upward position
Data Source
AI summary
A ligature-resistant wall hook for coats, towels, or other personal items, provides ligature-proof operation by rotation of a hook tab when the applied weight is over a threshold weight and by other included features. A baseplate having a planar rear surface is mounted to a wall or door and has a rotating tab attached for receiving and retaining the personal article. A restoring-force-providing member restores the rotating tab to an upward position. The ligature-resistant wall-mountable hook also include a cover for covering the baseplate and having an aperture through which the extension projects. An exterior profile of the cover above the aperture at each side of the aperture extends outward from the baseplate and downward at an angle exceeding 30 degrees from the perpendicular direction, so that a loop formed around the rotating tab and the cover and pulled downward is drawn outward to contact the rotating tab.