Grenade Safety Lever Obstruction for Striker Activation Detection
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Solution Overview
Problem
Hand grenades lack a reliable and self-evident indication of striker activation, leading to potential inadvertent detonation due to 'milking' when the safety lever is relaxed, causing serious injuries and fatalities, as existing designs fail to provide visual, tactile, or auditory cues for such activation.
Innovation Solution
A safety mechanism with an indicator protrusion on the striker assembly prevents the safety lever from returning to its initial position after striker activation, physically obstructing it and providing a noticeable difference in position to the user, allowing for immediate detection of initiation without close inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the safety lever is made returnable to its initial position after striker activation, then the grenade structure remains simple, but the user cannot detect striker activation and may suffer inadvertent detonation
Solution Approach 1:
The safety lever incorporates a visual indicator that changes color or position to signal striker activation. When the striker is activated, the indicator becomes visible or changes appearance, providing immediate visual feedback to the user without requiring complex additional mechanisms.
Solution Approach 2:
An indicator mechanism serves as an intermediary between the striker activation event and the user's perception. This indicator translates the internal mechanical state (striker position) into an observable signal, allowing the user to detect activation without directly observing the striker itself.
2Reliability
If the safety lever is prevented from returning to its initial position after striker activation, then the user can detect initiation, but the mechanism becomes more complex
Solution Approach 1:
The safety lever mechanism is segmented into distinct functional components: the lever itself, the striker assembly, and the indicator element. This segmentation allows each component to perform its specific function independently, simplifying the overall design while achieving the dual goals of prevention and detection.
Solution Approach 2:
The indicator function is merged with the safety lever structure itself rather than being a separate additional mechanism. The lever's physical configuration or visual characteristics change to indicate activation, combining the safety function and indication function into a single integrated component.
3Reliability
If close inspection is required to determine striker activation, then the mechanism remains simple, but the user cannot quickly detect initiation and may be injured
Solution Approach 1:
The indicator on the safety lever uses color changes or high-contrast visual features that are immediately apparent to the user. When the striker is activated, the indicator changes color or becomes visible, providing quick detection without requiring the user to closely inspect the mechanism.
Solution Approach 2:
The indication function is extracted from the internal mechanical components and presented at the external surface of the safety lever. This allows the user to detect activation from the outside without needing to inspect internal mechanisms or disassemble the grenade.
4Reliability
If the safety lever position does not change after striker activation, then the mechanism remains simple, but the user loses tactile feedback of initiation
Solution Approach 1:
Instead of the striker activating and then indicating its state, the mechanism is designed so that the act of striker activation directly causes a visible or tactile change in the safety lever's position or appearance. The indication is inverted from being a separate reporting function to being an inherent consequence of the activation event itself.
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
This solution provides a quick and reliable means for users to discern striker activation and grenade initiation, preventing unintended detonations by ensuring the safety lever remains in a distinct position, thus preventing injuries and fatalities.
Implementation Method 1
The fuze is lit by the action of a spring loaded striker mechanism impacting a primer
Implementation Method 2
The delay element burns down to an igniter at the other end of delay element
Implementation Method 3
an indicator protrusion on the posterior side of the striker assembly, which indicator protrusion, when the striker assembly is pivoted into contact with the primer, obstructs the safety lever from returning to its initial safe position
Data Source
AI summary
The subject invention provides a grenade which comprises a means of indicating, to a user, that the grenade's striker assembly has been activated, and thus provides an indication that the grenade has been initiated. Specifically, the subject invention provides such indication of striker activation, and thus grenade initiation, which is evident to the user by touch and feel, without the need for purposeful inspection of the grenade by said user. More specifically, the subject invention modifies the grenade's striker assembly to create a means to obstruct the safety lever from returning to its original position.