Fire Control Group Alignment for AK-47 Tolerance Variation
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Solution Overview
Problem
Existing fire control groups struggle to function consistently across AK-47 variants due to widely varying manufacturing tolerances, leading to potential malfunctions and compatibility issues.
Innovation Solution
A fire control group design that utilizes a receiver with pivot pin apertures and a grip screw for securement, allowing for precise positioning and adjustment, independent of trigger pin holes, to accommodate varying tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tight tolerance fire control group is manufactured, then reliability is improved, but compatibility with AK-47 variants having widely varying tolerances deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the fire control group components, specifically designing the trigger guard with extended portions that can accommodate varying distances between pivot pin apertures and trigger pin holes across different AK-47 variants. This parameter adjustment allows the same fire control group design to function reliably across weapons with widely varying manufacturing tolerances
Solution Approach 2:
The invention introduces adjustable and adaptable elements into the fire control group design, such as extendable trigger guard portions that can be positioned at different locations along the receiver. This dynamic adaptability allows the fire control group to adjust to different tolerance conditions in various AK-47 variants while maintaining reliable operation
2Ease of manufacture
If conventional securement method using trigger pin holes is used, then ease of manufacture is improved, but reliability deteriorates due to tolerance variations
Solution Approach 1:
The patent extracts the dependency on trigger pin holes for securement by introducing an alternative mounting method using pivot pin apertures and extendable trigger guard portions. This removes the problematic link between the fire control group and the tolerance-prone trigger pin hole locations, while still maintaining ease of assembly through the simplified securement approach
Data Source
AI summary
A fire control group has a receiver having opposed sidewalls defining a space configured to receive a fire control group, the opposed sidewalls each defining a pivot pin aperture, the pivot pin apertures being registered with each other, a fire control group including a trigger received in the space, the fire control group defining a transverse pivot pin passage configured to be registered with the pivot pin apertures of the receiver, the fire control group including a pivoting operational element, the fire control group including a pivot pin supporting the pivoting operational element and received in the transverse pivot pin passage and the pivot pin apertures, the firearm having a hand grip aft of the trigger and defining a screw aperture, and a grip screw engaging the hand grip and engaging the fire control group. The grip screw may occupy a medial plane of the firearm.