Lung Demand Regulator Lockout Mechanism
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Solution Overview
Problem
Existing lung demand regulators for breathing apparatus lack a reliable and simple-to-activate lockout mechanism for disabling breathing gas flow, particularly in environments where visual and audible feedback is unreliable, such as during the use of personal protective equipment or in emergencies.
Innovation Solution
A valve assembly with a lockout mechanism utilizing an axially compressible spring element that changes lateral deflection direction between release and lockout configurations, assisted by a pivotable lever and detent mechanism, providing clear tactile feedback and robust yet sensitive engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a lockout mechanism is provided to disable breathing gas flow, then gas conservation is improved, but the reliability and simplicity of activation is insufficient
Solution Approach 1:
The spring element is inverted in its operation - instead of extending to provide locking force, it is compressed to provide locking force. This inversion allows the spring to engage positively with the pivotable lever and detent feature, creating a more reliable lockout mechanism that is simple to activate through breath pressure
Solution Approach 2:
The lockout mechanism is designed to be automatically activated by the user's own breath pressure differential across the diaphragm. The system uses the user's breathing action itself to engage the lockout, eliminating the need for separate activation mechanisms and improving both reliability and simplicity
2Loss of information
If visual or audible feedback is used for lockout status indication, then user awareness is improved, but the system becomes less effective in environments with personal protective equipment or emergencies
Solution Approach 1:
The system provides tactile feedback through the pivotable lever that the user can feel through gloves and PPE. The lever's position and movement provide direct mechanical feedback about lockout status without relying on visual or audible cues, making the system adaptable to challenging environments
Solution Approach 2:
The patent replaces visual and audible feedback systems with a mechanical tactile feedback system. The pivotable lever provides direct mechanical indication of lockout status that can be felt through contact, substituting less reliable sensory channels with a more reliable mechanical sense that works through PPE
3Reliability
If a complex lockout mechanism is designed to be highly reliable, then activation reliability is improved, but the mechanism becomes more complex and harder to activate
Solution Approach 1:
The lockout mechanism is segmented into distinct functional components: the spring element for forcing, the pivotable lever for movement and feedback, and the detent feature for positioning. This segmentation allows each component to be optimized for its specific function while maintaining overall simplicity of operation
Solution Approach 2:
The pivotable lever acts as an intermediary between the spring element and the regulator valve apparatus. It translates the spring's forcing action into reliable valve lockout while providing tactile feedback to the user, simplifying the activation process while maintaining high reliability
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 mechanism ensures reliable and confident engagement of the lockout function, enhancing safety by providing improved tactile feedback and secure gas flow disablement, even in challenging environments, with reduced reliance on visual or audible cues.
Implementation Method 1
The spring element is configured to be laterally deflected in a first direction in the lockout configuration and laterally deflected in a second direction different from the first direction in the release configuration. The spring element is axially compressed during movement of the lockout mechanism between the release configuration and the lockout configuration.
Data Source
AI summary
There is disclosed a valve assembly for a lung demand regulator of a breathing apparatus. The valve assembly comprises a regulator valve apparatus for regulating a flow of breathing gas, the regulator valve apparatus being actuatable between a closed position in which no flow is permitted and an open position in which flow is permitted. The valve assembly further comprises a lockout mechanism configurable in: i) a lockout configuration in which the regulator valve apparatus is secured in the closed position, and ii) a release configuration in which the regulator valve apparatus is freely moveable. The lockout mechanism comprises an axially compressible spring element. The lockout mechanism is configured such that the spring element is axially compressed during movement of the lockout mechanism between the release configuration and the lockout configuration. Also disclosed is a lung demand regulator and a breathing apparatus comprising a lung demand regulator.