Ambidextrous Bolt Catch Assembly for Single-Handed AR Receiver Control
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Solution Overview
Problem
Conventional AR15/M4/M16-type firearms lack an ambidextrous and symmetrical bolt catch and release mechanism that is also ergonomic, requiring both hands for operation and disrupting the shooter's grip.
Innovation Solution
A bolt catch assembly comprising an enhanced bolt catch, vertical link, and ambidextrous finger pad, integrated into a modified lower receiver with a vertical-link slot, allowing single-handed operation from either side and maintaining ergonomic functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the magazine release is extended through both sides of the receiver with similar buttons on both sides, then the magazine release becomes ambidextrous and somewhat symmetric, but the bolt catch and release mechanism remains non-ambidextrous and non-symmetric
Solution Approach 1:
The bolt catch mechanism is divided into separate functional components: a left-side bolt catch button and a right-side bolt release button, each independently positioned on opposite sides of the receiver. This segmentation allows each side to be optimized for its specific hand operation while maintaining overall system functionality.
Solution Approach 2:
The patent deliberately uses asymmetric positioning of the bolt catch button on the left side and the bolt release button on the right side, with each button having different operational characteristics tailored to its side. This asymmetric design allows each hand to operate its respective button in the most ergonomic manner while achieving overall ambidextrous functionality.
2Adaptability or versatility
If a second pivotable bolt release part with a tooth-like portion is added on the right side to interact with the left-side bolt release, then ambidextrous operation is achieved, but the mechanism becomes non-symmetric and non-ergonomic
Solution Approach 1:
The patent extracts the bolt catch and release functions into separate, independently operable buttons positioned on opposite sides of the receiver. The left-side button performs the catch function while the right-side button performs the release function, eliminating the need for complex interacting mechanisms and achieving symmetry in operation.
Solution Approach 2:
Each button is designed to perform its specific function (catch or release) in a manner that is universal to both hands. The left-side catch button and right-side release button are positioned and shaped to be equally accessible and operable by either hand, providing universal ambidextrous functionality without requiring additional complex mechanisms.
3Adaptability or versatility
If the bolt catch button is extended around the underside of the firearm through the trigger guard area to the opposite side, then ambidextrous operation is achieved, but the design is not symmetric, not entirely ergonomic, and the exposed lever may create problems in use
Solution Approach 1:
The patent employs dynamic, pivotable buttons on both sides of the receiver that can be actuated by finger pressure. The left-side catch button and right-side release button are designed with pivot motion that allows ergonomic operation from either side, providing dynamic adaptability while maintaining safety by keeping all controls within the receiver boundaries.
Solution Approach 2:
The patent uses the receiver structure itself as an intermediary to house and protect the bolt catch and release mechanisms. By positioning the buttons within the receiver and using the receiver walls as mounting surfaces, the design protects the mechanisms from external interference while maintaining ambidextrous accessibility, eliminating the need for exposed levers extending outside the firearm.
Data Source
AI summary
A bolt catch assembly for a firearm lower receiver having a symmetrical and ambidextrous finger pad in an ergonomic location at the front of the trigger-well which operates the catch and release function of the bolt catch. The finger pad moves in a vertical motion; up to catch the bolt, and down to release the bolt. It may be operated from the left or the right finger pad by a left-hand finger or a right-hand finger. The finger pad is affixed to a vertical link which has a tooth at its top end which engages a groove on the edge of the bolt catch to make the bolt catch pivot. The vertical link includes an elongated slot that accommodates a magazine release shaft.