Angled Latch Charging Handle for Firearm
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Solution Overview
Problem
Existing charging handles for AR style weaponry require manual release and are not capable of disengagement solely by rearward force, which can lead to unintended movement during live fire due to rearward gas impulse.
Innovation Solution
A charging handle with a spring-loaded latch featuring an angled surface that engages the upper edge of the latch pocket, allowing disengagement by rearward force alone, with an angle of 34 to 38 degrees, providing consistent resistance to the rearward gas impulse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional latch with flat parallel surfaces is used, then the latch can be manufactured simply, but it requires manual release and cannot disengage solely by rearward force
Solution Approach 1:
The latch surface is changed from flat and parallel to angled at 34-38 degrees relative to the latch pocket surface. This parameter change in the geometric angle allows the latch to convert rearward linear force into rotational torque about the fulcrum pin, enabling automatic disengagement without manual release mechanisms.
2Ease of operation
If a rounded latch edge is used, then the latch can disengage easily, but it applies inconsistent force to resist rearward gas impulse
Solution Approach 1:
The latch transitions from a rounded edge geometry to an angled surface geometry with a specific 34-38 degree angle. This parameter change provides both the smooth disengagement characteristic of rounded edges and the consistent force application of flat surfaces, as the angled geometry ensures uniform contact and force distribution during operation.
3Reliability
If the latch surface is angled at 34 to 38 degrees, then consistent force is applied to resist rearward gas impulse, but manufacturing precision requirements increase
Solution Approach 1:
A specific angle range of 34 to 38 degrees is selected as the optimal parameter that balances manufacturing feasibility with functional performance. This range is wide enough to accommodate normal manufacturing tolerances while providing sufficient mechanical advantage to convert rearward force into effective torque for latch disengagement.
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 reliable and consistent disengagement of the charging handle from its forward position without manual intervention, preventing unintended rearward movement during firearm operation, thus enhancing operational safety and versatility.
Implementation Method 1
Compression spring 9 exerts expanding pressure between a bottom of a spring bore and a spring landing of the charging handle
Data Source
AI summary
A charging handle having a base and a substantially perpendicularly-oriented cross-member. The cross-member is configured to be received longitudinally within an upper receiver for a firearm with the base being positioned fully forward of the upper receiver. The charging handle further includes a spring-biased charging handle latch that pivots about a fulcrum pin. The charging handle latch has an upper arm and a lower arm. The upper arm includes an angled surface that, when engaged, contacts an upper edge of a charging handle latch pocket within a side of the upper receiver. The lower arm is biased by a compression spring that is positioned within a bore of the base. When engaged, the angled surface of the upper arm is retained within the latch pocket of the upper receiver and creates an angle relative to an imaginary centerline of the charging handle cross-member.