Threaded Bushing Trigger Mount for Rifle Lower Receiver

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Solution Overview

Problem

Existing trigger retention systems in rifles rely on pins and pin retention clips, which are not secure and require special machining or receivers for assembly, limiting flexibility and ease of use.

Innovation Solution

A threaded bushing component set is used to securely mount a removable trigger assembly in the lower receiver of a rifle, eliminating the need for pin retention clips and allowing assembly without special machining or receivers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pins and pin retention clips are used to secure the trigger assembly, then the trigger can be retained in the lower receiver, but the system becomes less secure and requires special machining or receivers

Engineering Contradiction:

Improvetrigger retention securityVSAvoidcompatibility with different lower receivers

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The threaded bushing is designed to be universally compatible with standard lower receivers that have pre-existing threaded holes, eliminating the need for special machining. The same bushing design can be used across different rifle platforms (AR-15, AR-10, etc.) as long as they have the standard threaded trigger assembly mounting holes, providing multi-functionality and broad adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention replaces the pin and clip mechanical retention system with a threaded fastening system. Instead of relying on pins that are held by clips, the trigger assembly is secured through threaded bushings that engage with the lower receiver's threaded holes, providing more secure retention through thread engagement rather than friction and interference fits.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If pins and pin retention clips are used to secure the trigger assembly, then the trigger can be retained, but the assembly process becomes more complex and requires special components

Engineering Contradiction:

Improvetrigger retention securityVSAvoidnumber of components and assembly steps

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The threaded bushing integrates multiple functions into a single component: it serves as both the mounting interface and the retention mechanism. The bushing combines the functions of the pin, the retention clip, and the threaded fastening element into one unified component, reducing the total number of parts and simplifying the assembly process.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention extracts and eliminates the pin retention clip from the system by using a threaded bushing that directly engages with the lower receiver. This removes the intermediate retention clip component entirely, simplifying the system by taking out the unnecessary element while maintaining secure retention through the threaded connection.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If special machining or special lower receivers are required for assembly, then secure trigger retention can be achieved, but ease of assembly and flexibility are reduced

Engineering Contradiction:

Improvetrigger retention securityVSAvoidassembly convenience and flexibility

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The threaded bushing is designed to work with standard lower receivers that already have threaded holes for trigger assembly mounting. This universal design eliminates the need for special machining operations or custom lower receiver variants, allowing the same bushing to be installed on various rifle platforms using conventional manufacturing processes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11614293B2Trigger securing apparatus

Publication Date: 2023.03.28 ELFTMANN JR ARTHUR JOSEPH

AI summary

Trigger module securing apparatus using internally threaded pins and threaded fasteners to secure a trigger module into the lower receiver of a rifle.