Ambidextrous Bolt Catch Mechanism for Firearm Lower Receiver

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Solution Overview

Problem

Standard bolt catches in firearms, such as the AR-15, are not ambidextrous, limiting users to operate them from only one side, which can be inconvenient for individuals who need to manipulate the bolt catch from either side.

Innovation Solution

An ambidextrous bolt catch system is introduced, featuring a rotatable bolt release lever and bolt catch within the lower receiver, allowing for ambidextrous manipulation by interacting through a bolt release projection and recess, with the bolt catch biased to a disengaged position for easy operation from either side.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a standard bolt catch is used, then the structure is simple and reliable, but it can only be operated from one side, reducing adaptability

Engineering Contradiction:

Improveambidextrous operation capabilityVSAvoidbolt catch mechanism complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The bolt catch mechanism is divided into two separate levers: a left-side bolt catch lever and a right-side bolt release lever. Each lever can independently operate the bolt catch function from its respective side, enabling ambidextrous operation while maintaining the simplicity and reliability of individual lever components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bolt catch lever and bolt release lever are designed as universal components that can be interchangeably operated by either hand. Both levers connect to the same bolt catch mechanism, allowing the system to perform the same function (locking/releasing the bolt) from either side of the firearm.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If a standard single-sided bolt catch is used, then the manufacturing is simple, but the ease of operation is limited for users needing bilateral control

Engineering Contradiction:

Improvebilateral access to bolt catchVSAvoidnumber of levers and connections

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The operation control is segmented into two separate levers positioned on opposite sides of the receiver. The left-side bolt catch lever provides operation from the left, while the right-side bolt release lever provides operation from the right, giving users bilateral access without requiring a single complex mechanism.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Both the left-side bolt catch lever and right-side bolt release lever connect to the same bolt catch mechanism through intermediate connection points. This intermediary connection allows either lever to independently control the bolt catch function, providing ease of operation from either side while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 users to lock and release the bolt from either side of the firearm, enhancing usability and convenience by providing ambidextrous control over the bolt catch mechanism.

Implementation Method 1

The bolt catch is spring biased to the bolt release position

Methodology Applied

Scientific EffectSpring biasing: Spring

Data Source

PatentUS11512920B1Ambidextrous bolt catch for a lower receiver

Publication Date: 2022.11.29 OGLESBY PAUL A

AI summary

An ambidextrous bolt catch having at least some of a bolt release lever having a bolt release projection, wherein the bolt release lever is rotatable between an engaged position and a disengaged position; and a bolt catch having a bolt catch recess, wherein at least a portion of the bolt release projection is received within at least a portion of the bolt catch recess, wherein the bolt catch is rotatable between an engaged position and a disengaged position, and wherein rotational movement of the bolt release lever produces rotational movement of the bolt catch, via interaction of at least a portion of the bolt release projection and at least a portion of the bolt catch recess.