Adjustable Delay Igniter with Relief Bore for Situational Adaptability
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Solution Overview
Problem
Existing irritant devices, such as hand grenades, lack the ability to adjust delay times for pyrotechnic effects, limiting situational adaptability and effectiveness in non-lethal defense and police operations.
Innovation Solution
Incorporating a relief bore in the igniter housing that can be opened or closed to adjust the burning conditions of the pyrotechnic delay charge, allowing for adjustable delay times by altering the pressure at which the charge burns, enabling setting of delay times such as 0.5, 1.0, or 1.5 seconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed delay time is used in the igniter, then the device structure is simple, but the adaptability to different situations is poor
Solution Approach 1:
The patent implements a dynamic delay time adjustment mechanism where the delay charge can be selectively connected to the firing charge through a movable component (such as a slider or plug). This allows the delay time to be changed from fixed to variable, enabling adaptation to different operational situations without fundamentally changing the igniter's core structure.
Solution Approach 2:
The igniter is divided into separate functional sections: a delay charge chamber, a firing charge chamber, and a controllable connection mechanism. The delay charge area can be selectively isolated or connected to the firing charge area, allowing independent adjustment of delay time while maintaining structural modularity and simplicity.
2Duration of action of moving object
If the delay charge burns under pressure, then the delay time is short and predictable, but the ability to extend delay time is limited
Solution Approach 1:
The patent changes the pressure parameter of the delay charge burning process by providing a selective pressure relief path. When the relief path is opened, the delay charge burns at atmospheric pressure extending the burn time; when closed, it burns under confined pressure for shorter, more predictable delay. This allows continuous adjustment of delay time by changing the pressure condition.
Solution Approach 2:
A pressure relief mechanism (such as a movable plug or slider with selective openings) acts as an intermediary between the delay charge chamber and the external environment. This intermediary controls whether combustion gases are confined or allowed to escape, thereby regulating the burning rate and delay time without directly modifying the delay charge composition.
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
Enables individual and situation-dependent adjustment of delay times, influencing the effect of active materials like bangs, flashes, and noises, enhancing the adaptability and effectiveness of irritant devices in various scenarios.
Implementation Method 1
a pyrotechnical charge burning under no pressure burns down more slowly than a charge under pressure
Data Source
AI summary
The invention relates to an igniter with a delay time (Vz) that can be set. The delay time (Vz) can be fixedly defined, or individually and situation-dependently set on-site. In particular, the invention relates to a delay time that can be set for a stun grenade, a hand grenade etc., with options for the individual setting and situation-dependent or situation-contingent customisation of the delay time (Vz), and consequently of the effect of the active compositions in-situ. In order to achieve individual setting options, the invention proposes that at least two different delay times (Vz) can be set. To this end, the igniter has, in a delay section, preferably in the fuse head, a relief bore that can be closed or opened.