Hinged Handrail System for Bulkhead Stairwell Safety
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Solution Overview
Problem
Bulkhead stairwells often lack handrails, posing challenges and safety risks for users, especially young and elderly individuals, due to design constraints and lack of applicable building codes.
Innovation Solution
A handrail system comprising an upper railing, a post, and hinges that allow the system to transition between an upright, use position and a lowered, stowed position, with a locking mechanism and tether for secure deployment and retraction, ensuring full-length support when needed and compact storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hand railing is installed in a bulkhead stairwell, then safety and accessibility for users are improved, but the available space is reduced and installation becomes difficult due to proximity to bulkhead doors
Solution Approach 1:
The hand railing system employs hinges at both the post and railing connections, allowing the railing to dynamically transition between an extended operational position for safety and a retracted stowed position to maximize available space. This dynamic configuration resolves the contradiction by making the space occupation conditional rather than fixed.
Solution Approach 2:
The hand railing system is divided into separable components including a post portion and a railing portion connected by hinges. This segmentation allows the railing to be independently positioned and stowed, enabling space optimization while maintaining safety functionality when needed.
2Reliability
If a hand railing extends along the entire length of the stairwell, then safety support is improved, but installation becomes challenging due to proximity to bulkhead doors
Solution Approach 1:
The hinged connection allows the railing to be installed in a compact configuration near the bulkhead door and then dynamically extended to the full length required for safety support, eliminating the need for complex custom installations while maintaining full safety functionality.
3Reliability
If a hand railing is made stationary to provide continuous support, then reliability is improved, but adaptability to different positions is reduced
Solution Approach 1:
The hinged hand railing system provides continuous support when extended while allowing positional adaptation through controlled movement. The system can be positioned in multiple configurations including extended, retracted, and intermediate positions, simultaneously achieving reliability and adaptability.
Solution Approach 2:
The system changes its geometric parameters (length, position, orientation) through hinge movement, allowing it to adapt to different spatial requirements while maintaining the essential function of providing handrail support when needed.
Data Source
AI summary
A handrail system that is constructed and arranged to be coupled to a stairwell such that at least a portion of a hand railing may be in an upright position or a lowered position. In an upright position, the system provides a complete top-to-bottom handrail. In the lowered, stowed position, the upper railing portion is conveniently stowed away within the stairwell. In a bulkhead embodiment, a full handrail is provided in the upright, use position and the upper railing is stowed within the bulkhead when the bulkhead doors are closed.