Fire Control Group Safety Mechanism for Accidental Discharge Prevention
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Solution Overview
Problem
Current M4/AR-15 rifles have a safety mechanism that can only be engaged when the weapon is cocked, leaving a window for accidental discharge during charging, as the hammer is cocked before the safety is engaged.
Innovation Solution
A redesigned fire control group allows the safety to be engaged at any time, featuring a trigger with separate portions that enable the safety selector to move independently of the hammer, preventing accidental discharges by ensuring the hammer cannot fire unless the safety is explicitly disengaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the safety mechanism is designed to engage only when the weapon is cocked, then the trigger mechanism can be simplified, but the risk of accidental discharge increases during charging
Solution Approach 1:
The trigger is divided into separate portions: a first portion that engages the user's finger to allow firing, and a second portion that independently contacts the hammer to retain it in position. This segmentation allows the safety mechanism to function independently of the firing trigger, enabling safety engagement at any time regardless of hammer position, thereby eliminating accidental discharge risk during charging while maintaining simple trigger operation.
2Speed
If the hammer is cocked before the safety is engaged, then the weapon can be quickly ready to fire, but the window for accidental discharge opens during the charging process
Solution Approach 1:
The safety mechanism is designed to be engageable in advance, before the hammer is cocked. The selector switch can be positioned to engage the safety latch in any position, including before charging begins. This preliminary safety engagement ensures that even if the hammer is accidentally cocked during handling, the safety mechanism is already in place to prevent discharge, thereby maintaining both quick readiness and high reliability.
3Object-affected harmful factors
If the safety mechanism allows engagement at any time, then accidental discharge risk is eliminated, but the trigger mechanism becomes more complex
Solution Approach 1:
The safety selector switch is merged with the existing trigger assembly, sharing common components such as the trigger bar and pivot pin. The selector switch integrates directly into the trigger mechanism, allowing it to engage or disengage the safety latch without requiring separate independent components. This merging approach enables safety engagement at any time while minimizing the increase in overall mechanism complexity.
4Adaptability or versatility
If the trigger portions move relative to each other, then the safety can be engaged independently of hammer position, but the manufacturing precision requirements increase
Solution Approach 1:
The trigger is designed with dynamic relative movement between its portions, allowing the second portion to move independently of the first portion during operation. This dynamic design enables the safety selector to engage or disengage at any hammer position without requiring complex linkages. The relative movement is achieved through simple geometric relationships and clearance design, minimizing the need for high manufacturing precision while maintaining full operational flexibility.
Data Source
AI summary
Exemplary embodiments include a completely redesigned fire control group to allow the safety to be engaged at any time. This unique feature can reduce or eliminate the possibility of accidental discharges of the weapon system, as engaging the safety will not allow the hammer to move forward even in the event of a malfunction.