Auxiliary Trigger Assembly for Assault Rifle Ergonomics

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Solution Overview

Problem

Existing pistol-to-rifle conversion kits have the trigger forward of the magazine well, differing from assault rifles like M-16, AR-15, and AK-47, which have the handle, trigger, and magazine well in a specific rearward-to-forward order.

Innovation Solution

A pistol-to-rifle conversion kit with an auxiliary trigger positioned rearward of the pistol trigger, placing the magazine well forward of the auxiliary trigger, mimicking the handle, trigger, and magazine well configuration of assault rifles, including a straight and non-pivoting rifle body with a sliding auxiliary trigger and trigger safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the pistol trigger is positioned forward of the magazine well (prior art configuration), then the pistol can be easily adapted to a rifle assembly, but the resulting weapon does not replicate the familiar assault rifle layout and handling characteristics

Engineering Contradiction:

Improvepistol adaptability to rifle assemblyVSAvoidassault rifle layout familiarity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

An auxiliary trigger assembly is introduced as an intermediary component between the shooter's finger and the pistol trigger. This auxiliary trigger includes a trigger member that contacts the shooter's finger and transmits force through a linkage mechanism to actuate the pistol trigger, thereby mediating the control interface to achieve proper ergonomic positioning while maintaining pistol functionality

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The trigger control system is segmented into separate functional components: the auxiliary trigger assembly (with its own trigger member and linkage) and the original pistol trigger. This segmentation allows the auxiliary trigger to be positioned in the conventional assault rifle location while the pistol trigger remains in its original position relative to the magazine well

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the auxiliary trigger is positioned rearward of the pistol trigger, then the handle-trigger-magazine well sequence matches assault rifle configuration, but this requires additional complex mounting mechanisms

Engineering Contradiction:

Improvehandle-trigger-magazine well sequenceVSAvoidtrigger mounting mechanism

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The auxiliary trigger assembly is merged with the pistol grip assembly through integrated mounting structures. The auxiliary trigger is mounted to the pistol grip or lower receiver in a fixed relationship, combining the functions of grip and trigger control into a unified assembly that simplifies the overall structure despite the additional trigger mechanism

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4170275B1Pistol-to-rifle conversion kit

Publication Date: 2023.08.23 RECOVER INNOVATIONS LTD

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Figure 2A~2C
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AI summary

A pistol-to-rifle conversion kit (100) includes a rifle body (26) that includes a lower receiver (28), which includes a grip mounting portion (30), which is rearwardly adjacent to a trigger guard (32), which is rearwardly adjacent to a magazine well receiving portion (34). An auxiliary trigger (46) is sliding mounted in the rifle body (26) and includes an elongate member (48) and a forward trigger interface member (50), which extends from a forward portion of the elongate member (48) and which is configured to interface with a trigger (13) of a pistol (14) mounted in the rifle body (26), and a trigger member (56) which extends from the elongate member (48) for directly contacting a shooter's finger.