Avalanche Airbag Triggering Device Safety Lock
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Solution Overview
Problem
Existing airbag systems for avalanche rescue lack reliable and accessible triggering mechanisms, particularly for situations where manual activation is difficult, and there is a need for a system that can maintain users and equipment buoyant and on the surface during avalanches.
Innovation Solution
The airbag rescue system incorporates a triggering device with a safety lock and trigger handle that requires a specific force range (50-150 N) to initiate inflation, featuring a detent mechanism for physical feedback and a lanyard for supplemental activation, ensuring the handle is always accessible and preventing accidental triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple trigger mechanism is used, then ease of operation is improved, but reliability deteriorates due to accidental triggering
Solution Approach 1:
The safety lock is positioned to block the trigger handle in its resting state, preventing accidental activation. The user must first disengage the safety lock before the trigger handle can be pulled, ensuring intentional activation only. This preliminary blocking action resolves the contradiction by maintaining ease of operation while preventing accidental triggering.
Solution Approach 2:
The triggering mechanism is divided into two independent components: the safety lock and the trigger handle. The safety lock can be disengaged with a simple lateral motion, while the trigger handle requires a separate pulling action. This segmentation allows each component to be optimized for its specific function, maintaining ease of operation while ensuring reliable prevention of accidental triggering.
2Reliability
If a force-requiring trigger mechanism is used, then reliability is improved by preventing accidental triggering, but ease of operation deteriorates
Solution Approach 1:
The spring mechanism applies force selectively at the trigger handle, requiring effort only at the point of activation. The safety lock, by contrast, requires minimal force for lateral disengagement. This local differentiation of force requirements resolves the contradiction by concentrating the force requirement where it provides maximum reliability benefit while minimizing overall operational effort.
Solution Approach 2:
The spring-loaded trigger mechanism provides dynamic resistance that adapts to the activation force applied. The spring engages progressively as the trigger handle is pulled, providing initial resistance to prevent accidental triggering but allowing smooth completion of the activation stroke. This dynamic force application resolves the contradiction between reliability and ease of operation.
3Ease of operation
If the trigger handle is always accessible, then ease of operation is improved, but reliability deteriorates due to snagging risks
Solution Approach 1:
The safety lock is positioned to extend into the path of any external objects or debris that might snag on the trigger handle. By blocking access to the trigger handle's movement path, the safety lock prevents snagging before it can occur, while still allowing intentional activation when the lock is disengaged. This preliminary protective action resolves the contradiction between accessibility and snagging prevention.
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
An airbag rescue system employed as a life-saving system to enable a person to survive an avalanche or other situation, such as a water rescue. The airbag system includes an air movement device that takes the form of a source of compressed air or an electrically powered air mover, such as one that includes a bladed rotor for inflating the airbag with ambient air, such as 100% ambient air, for example. The system further includes a supporting device, such as a harness or a backpack, for supporting the inflatable airbag and the powered air movement device on a user in a ready position of the airbag rescue system. The system also includes triggering device that includes a trigger handle configured and arranged to initiate inflation of the inflatable airbag by being manipulated by the user. In the ready position of the airbag rescue system, while the airbag is not yet in a deployed position, the trigger handle is conveniently externally accessible for the user to trigger the inflation of the airbag.