Ambidextrous Bolt Catch Mechanism for Controlled Jam Clearing

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Solution Overview

Problem

Existing firearms require complex and time-consuming jam-clearing processes that necessitate repositioning of the trigger hand, posing safety risks and control issues, especially for right-handed operators, and are less intuitive for left-handed operators due to the configuration of the bolt catch mechanism.

Innovation Solution

An ambidextrous bolt catch mechanism allowing operation with either hand, featuring a frame with opposed sides and a secondary bolt catch interface assembly, including an actuator that moves the bolt catch between retracted and restraint positions through distinct actuation efforts, enabling intuitive and efficient jam clearing without hand repositioning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a standard bolt catch mechanism is used positioned on one side of the firearm, then the structure is simple and manufacturing is easy, but right-handed operators must remove their firing hand twice during jam clearing which slows the process and creates safety risks

Engineering Contradiction:

Improvejam clearing speed and safetyVSAvoidbolt catch mechanism structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The bolt catch mechanism is segmented into two independent parts: the primary bolt catch on the left side and the secondary bolt catch interface assembly on the right side. This segmentation allows each hand to operate its own bolt catch independently, eliminating the need for right-handed operators to remove their firing hand during jam clearing operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The secondary bolt catch interface assembly acts as an intermediary mechanism that translates right-hand operations into bolt catch actuation. The actuator within this assembly serves as a mediator between the user's right hand and the bolt catch system, enabling intuitive operation without modifying the primary left-side mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the bolt catch is positioned only on the left side of the frame, then the mechanism is simple, but left-handed operators find the jam clearing process less intuitive and potentially less efficient

Engineering Contradiction:

Improveadaptability to different handednessVSAvoidnumber of interface assemblies

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The firearm's bolt catch system is made universal by providing both left-side and right-side interface assemblies. Each assembly can serve as the primary operation point depending on the user's handedness, making the firearm adaptable to both right-handed and left-handed operators without requiring different firearm configurations.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If multiple steps are required to clear a jam including removing the firing hand, then the standard mechanism is simple to manufacture, but the process takes more time and reduces productivity

Engineering Contradiction:

Improvejam clearing speedVSAvoidnumber of操作步骤

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The secondary bolt catch interface assembly is pre-positioned on the right side of the frame, allowing right-handed operators to immediately access and operate the bolt catch without removing their firing hand. This preliminary positioning of the interface assembly eliminates the need for hand repositioning during jam clearing operations.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If the right hand is removed from the firing grip during jam clearing, then the bolt can be operated, but control and safety of the firearm is reduced

Engineering Contradiction:

Improvefirearm control during operationVSAvoidbolt operation accessibility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The bolt catch interface is extended into a new spatial dimension by adding the secondary assembly on the right side of the frame. This dimensional expansion allows the operator to access the bolt catch mechanism from the same hand position used for firing, maintaining continuous control of the firearm without removing the firing hand.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12392571B2Firearm with ambidextrous bolt catch

Publication Date: 2025.08.19 MAUGHAM CHRISTOPHER MATTHEW

AI summary

A firearm with ambidextrous bolt catch has a frame, a bolt catch connected to the frame and movable between a retracted position and a restraint position, the bolt catch having exposed interface surfaces on a first side of the frame and configured to enable user contact to motivate the bolt catch to the retracted position and the restraint position, a secondary bolt catch interface assembly operable to motivate the bolt catch to the retracted position and to the restraint position, the secondary bolt catch interface assembly including an actuator having an actuation surface on a second side of the frame, and the actuator operable to move the bolt catch from the restraint position to the retracted position in response to a first actuation effort, and to move the bolt catch from the retracted position to the restraint position in response to a different second actuation effort.