Munition Safety Device with Visual State Indicator
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Solution Overview
Problem
Conventional safety and arming (S&A) devices in munitions can arm prematurely, leading to safety hazards and the costly abandonment of unused munitions, as it is difficult to verify whether they are safely recoverable after a mission is aborted.
Innovation Solution
A safety device with a switch member and actuation mechanism that moves between arming prevention and enabling positions, allowing for safe and verifiable recovery of munitions by providing visual confirmation of the safety state, preventing accidental arming, and allowing recovery even if the S&A device has inadvertently armed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional S&A devices are used without visual indication, then the device structure remains simple, but it becomes impossible to verify whether the munition is safely recoverable after mission abort
Solution Approach 1:
The patent employs color-coded visual indicators (e.g., green for safe, red for dangerous) to communicate the safety state of the munition. This allows operators to immediately understand the arming status without complex instrumentation, resolving the contradiction by providing clear information while maintaining structural simplicity.
Solution Approach 2:
The patent introduces a visual indicator mechanism as an intermediary between the S&A device's internal state and the external operator. This mediator translates the complex internal arming status into simple visual signals, enabling verification of safety state without exposing the operator to hazards or requiring direct inspection of dangerous components.
2Reliability
If conventional S&A devices without visual markers are used, then the device complexity is low, but munition recovery after abort is unsafe due to inability to verify arming state
Solution Approach 1:
The patent uses color-coded visual indicators to communicate the safety state of the munition. This allows operators to immediately understand the arming status without complex instrumentation, resolving the contradiction by providing clear information while maintaining structural simplicity.
Solution Approach 2:
The visual indicator system is prepared in advance to show the current safety state before any recovery operation begins. This preliminary visual information allows operators to make informed decisions about whether to attempt recovery or maintain safety distance, eliminating the need for risky verification procedures.
3Loss of information
If visual marker system is added to indicate safety state, then safe and verifiable recovery is enabled, but the device complexity increases
Solution Approach 1:
The patent employs color-coded visual indicators (e.g., green for safe, red for dangerous) to communicate the safety state of the munition. This allows operators to immediately understand the arming status without complex instrumentation, resolving the contradiction by providing clear information while maintaining structural simplicity.
Solution Approach 2:
The patent introduces a visual indicator mechanism as an intermediary between the S&A device's internal state and the external operator. This mediator translates the complex internal arming status into simple visual signals, enabling verification of safety state without exposing the operator to hazards or requiring direct inspection of dangerous components.
4Reliability
If conventional S&A devices are used, then the structure is simple, but single point failure can cause premature arming leading to safety hazards and munition abandonment
Solution Approach 1:
The visual indicator system provides continuous feedback about the actual safety state of the munition to operators. This feedback mechanism allows for immediate detection of any unexpected arming conditions, enabling operators to take corrective action or maintain appropriate safety distances, thereby preventing accidents from single point failures.
Solution Approach 2:
The visual indicator system serves as a preliminary warning system that alerts operators to potential dangers before they result in accidents. By providing advance notice of the arming state, the system allows operators to take preventive measures or abort operations safely, cushioning against the effects of potential single point failures.
Data Source
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Figure 3(a)~3(b)
AI summary
Examples of safety devices for use with a munition are provided, the munition including a munition explosive and a safe and arm (S&A) device for activation of the munition explosive. In some examples the safety device includes a switch member and an actuation mechanism. The switch member is configured for being disposed between the munition explosive and the S&A device, the switch member being movable between at least two switch positions. In a first switch position (an arming prevention position (APP)), arming communication between the munition explosive and the S&A device is prevented. In a second switch position (an arming enabling position (AEP)), arming communication between the munition explosive and the S&A device is allowed. The actuation mechanism is configured for selectively moving the switch member at least from the APP to the AEP to thereby enable the S&A device, when armed, to detonate the munition explosive via the switch member.