Multiple Report Stun Grenade with Segmented Delay Tubes
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Solution Overview
Problem
Existing multiple report stun grenades are complex and expensive to manufacture, and are vulnerable to cross-contamination of pressure gradients causing sympathetic communication between explosion events, leading to unpredictable charge initiation and potential injury.
Innovation Solution
A multiple report stun grenade design featuring an elongated body with evenly spaced delay and flash charge chambers, each with axial venting at both ends, and a fuse assembly that ensures balanced motive forces and reduced likelihood of cross-contamination through strategically positioned ignition passages and delay tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multiple report stun grenade is designed with multiple flash charge chambers and delay tubes, then the tactical effectiveness is improved, but the device complexity increases and manufacturing cost increases
Solution Approach 1:
The grenade body is divided into multiple separate flash charge chambers (first, second, and third chambers) with individual delay tubes for each chamber. This segmentation allows each charge to be independently controlled and timed, providing multiple distinct reports while keeping each chamber's design relatively simple and manageable.
Solution Approach 2:
The delay tube assembly serves multiple functions: it provides timed delay for sequential discharge, acts as a flame barrier to prevent cross-contamination, and structures the communication of ignition between the fuse and individual flash charges. This multi-functionality reduces the need for additional separate components.
2Adaptability or versatility
If a multiple report stun grenade uses a central delay column with multiple tubes, then multiple reports are achieved, but cross-contamination of pressure gradients can cause sympathetic communication between explosion events
Solution Approach 1:
Instead of a single central delay column, the invention uses three separate delay tubes (first, second, and third delay tubes) that are spatially separated and individually connected to their respective flash charge chambers. This physical separation eliminates pressure gradient cross-contamination between chambers, as each delay tube operates independently within its own sealed pathway.
Solution Approach 2:
The delay tubes act as intermediary flame barriers between the fuse assembly and the individual flash charge chambers. The delay tube material (such as zirconium nickel) provides controlled burn that mediates the ignition process, ensuring that flame communication occurs only through the intended delayed pathway and not through pressure gradients or direct communication between chambers.
3Manufacturing precision
If the communication tubes are made small to control flame propagation, then sequential discharge is achieved, but flame communication may be delayed causing charges to go off out of order
Solution Approach 1:
The invention controls flame propagation by changing parameters of the delay tube itself rather than relying solely on tube diameter. The delay tube material composition (such as zirconium nickel), length, and wall thickness are optimized to provide consistent, controlled burn rates that ensure reliable sequential ignition of flash charges in the intended order, eliminating out-of-sequence discharge.
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 design provides a safer, more reliable, and cost-effective multiple report stun grenade that minimizes the risk of injury and unpredictable discharge, maintaining stability and balance during use.
Implementation Method 1
A fuse is activated by release of a handle as in a typical grenade, and the fuse ignites a column of delay material (such as black powder or Zirconium Nickel). The column provides a delay (typically 1/2 second) until the flame front in the delay material reaches an aperture that communicates with the flash-charge material, igniting it
Implementation Method 2
igniting it to provide a bright flash and loud report
Data Source
AI summary
Multiple report stun grenades have an elongated body defining a body axis and having a sidewall and opposed top and bottom end faces, the body including a plurality of delay chambers each containing a different delay feature, the body having a plurality of flash charge chambers each containing a quantity of flash charge material, the body defining a plurality of ignition passages, each ignition passage communicating from a respective flash charge chamber to an associated delay chamber, each flash charge chamber having at least one exhaust aperture, and each of the exhaust apertures penetrating at least one of the top and bottom end faces. Each of the flash charge chambers may have a first exhaust aperture penetrating the top end face, and a second exhaust aperture penetrating the bottom end face. Each of the flash charge chambers may be an elongated bore parallel to the body axis.