Radial Progression Hinge Cap Conceals Geared Continuous Hinge
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Solution Overview
Problem
Institutions like prisons and mental hospitals face the risk of self-inflicted injuries due to the misuse of door hinges, particularly the protruding top surfaces of geared continuous hinges, which can be used for hanging or other abusive purposes, leading to damage and injury.
Innovation Solution
A radial progression hinge cap is designed to cover and conceal the exposed top surface of geared continuous hinges, mounting to a door jamb above the hinge, with a sloping upper surface that flares outward to prevent misuse as the door moves between open and closed positions, ensuring continuous coverage and concealment of the hinge and door corner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the top surface of the hinge is left exposed for structural functionality, then the hinge can perform its door-supporting function, but the exposed surface creates ligature risks and allows misuse
Solution Approach 1:
A hinge cap is introduced as an intermediary component between the door jamb and the exposed hinge surface. The cap covers the ligature-risk areas while the door leaf passes through it, maintaining door support functionality while eliminating the harmful exposed surfaces.
Solution Approach 2:
The hinge assembly is segmented into functional components: the hinge mechanism itself, the protective cap covering the top surface, and the door leaf. This segmentation allows the cap to independently address the ligature risk while the hinge continues its supporting function.
2Reliability
If a cover is added to conceal the hinge top surface, then ligature resistance is improved, but the device complexity increases
Solution Approach 1:
The hinge cap serves multiple functions simultaneously: it conceals the ligature-risk surfaces, provides structural support for the door leaf to pass through, and maintains the aesthetic appearance. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The hinge cap merges the protective covering function with the structural support function by integrating the door leaf passage directly into the cap structure, eliminating the need for separate support mechanisms.
3Reliability
If the hinge cap covers the entire top surface, then ligature resistance is maximized, but the manufacturing complexity increases
Solution Approach 1:
The hinge cap employs a curved, radially-progressing surface that slopes downward from the door jamb toward the door leaf. This continuous curved surface is both ligature-resistant and manufacturable using standard forming processes, avoiding complex geometric features.
Solution Approach 2:
The cap design uses a progressive radial curvature parameter that varies continuously from the mounting surface to the free edge. This parameter variation provides optimal ligature resistance while maintaining simplicity in manufacturing through conventional forming techniques.
Data Source
AI summary
A radial progression hinge cap has a cap body that is configured to attach to a door jamb of a door frame above a geared continuous hinge that supports a door in the door frame. The cap body has a rear attachment channel that is configured to be attached at the door jamb. The cap body also has an upper surface that slopes downward from a top edge of the rear attachment channel to a front distal edge of the cap body. The front distal edge protrudes a threshold distance away from the rear attachment channel so that the upper surface of the cap body spans over and conceals a top surface of the geared continuous hinge and an upper corner of the edge portion of the door as it moves between the open and closed positions.