Rotational Sear Block Isolating Trigger Movement

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Solution Overview

Problem

Existing pistol sear designs face challenges in achieving a short, crisp trigger pull while maintaining positive sear engagement, with issues such as quality control dependencies and undesirable trigger feel due to off-axis movements in rotational triggers.

Innovation Solution

A rotational sear design that isolates rotational movement to the sear block, allowing for a 1911-style trigger yoke and ensuring independent forces acting on the sear and sear block, resulting in a consistent trigger lever travel length and positive sear engagement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a rotational style trigger is used, then the trigger can actuate the sear, but it introduces off-axis movement that disrupts the sight picture

Engineering Contradiction:

Improvetrigger actuationVSAvoidoff-axis movement disrupting sight picture

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The trigger system is segmented into separate functional components: the trigger lever rotates on a pivot, while the trigger bar translates linearly along the bore axis. This segmentation allows the rotational input to be converted into linear output, achieving trigger actuation without transmitting off-axis movement to the sear engagement point.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If a 1911-style translational trigger is used, then off-axis movement is prevented, but the trigger pull length and complexity increase

Engineering Contradiction:

Improveoff-axis movement preventionVSAvoidtrigger mechanism complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The trigger mechanism employs dynamic motion conversion where the trigger lever's rotational movement is dynamically transformed into linear translation of the trigger bar through a cam surface interaction. This allows the system to achieve the simplicity of linear trigger pull while incorporating the mechanical advantage of rotational actuation.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the sear is under constant pressure by the hammer, then engagement is maintained, but machining imperfections can lead to negative engagement and accidental discharge

Engineering Contradiction:

Improvesear engagement stabilityVSAvoidaccidental discharge risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A disconnector component is introduced as an intermediary between the hammer and sear engagement system. The disconnector includes a cam surface that controls the timing and manner of sear engagement, ensuring that the sear and hammer ledges are properly aligned before engagement occurs. This intermediary mechanism eliminates the direct constant pressure relationship while maintaining reliable engagement through controlled interaction.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10126082B2Sear mechanism for firearms

Publication Date: 2018.11.13 DANIEL DEFENSE LLC

AI summary

A rotational sear block isolates the rotational movement of the sear to the sear mechanism without using a rotational trigger. The isolation of the sear rotation to the sear mechanism allows for a single axis translational trigger to be used which gives the shooter the advantages of a short, crisp trigger pull without any off-axis movement. Additionally, the positive sear engagement and inherent safety of the design are achieved due to the sear being engaged and biased onto the sear block surface, disallowing unintended or accidental release.