Deflectable Trigger Bar Assembly for Controlled Sear Release

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Solution Overview

Problem

Firearms intended for precision shooting often have triggers that are vulnerable to inadvertent actuation, leading to accidental discharges due to mechanical failure or user error, while triggers designed for safety can make the firearm difficult to shoot accurately.

Innovation Solution

A trigger assembly with a sear and trigger bar design that includes a deflectable upper leg and a striker engagement lug, allowing for a controlled release mechanism that reduces accidental discharges and maintains accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the trigger is designed to be sensitive and easy to actuate, then precision shooting capability is improved, but vulnerability to inadvertent actuation increases

Engineering Contradiction:

Improvetrigger actuation easeVSAvoidsafety against inadvertent discharge

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The trigger bar is segmented into multiple functional components: a trigger bar body, an upper leg with sear engagement surface, and a lower leg. The sear is also segmented with distinct engagement surfaces. This segmentation allows independent optimization of each component's function - the upper leg can be designed for precise engagement while the lower leg provides structural support and safety features.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the trigger bar are given different properties. The upper leg has a sear engagement surface with specific geometric features for controlled disengagement, while the lower leg has a different geometry for trigger actuation. The trigger bar body connects these regions and provides overall structural integrity. This local differentiation allows the trigger to be both sensitive (upper leg) and safe (lower leg structure).

Inventive Principle:

Principle #3Local quality

2Reliability

If the trigger pull is made long or heavy for safety, then safety against inadvertent actuation is improved, but shooting accuracy becomes difficult to maintain

Engineering Contradiction:

Improvesafety against inadvertent dischargeVSAvoidshooting accuracy

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The trigger bar's upper leg is designed to be deflectable, transitioning from a default engaged shape to a disconnected shape during operation. This dynamic behavior allows the trigger bar to flex and control the disengagement timing precisely. The elastic deflection provides a progressive release mechanism that maintains safety while enabling accurate trigger breaks.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The geometric parameters of the sear engagement surfaces are specifically designed to control the trigger pull characteristics. The angle and position of the sear engagement surface relative to the trigger bar engagement surface create a mechanical advantage that reduces the effective trigger pull weight while maintaining safety through controlled engagement geometry.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If the sear engagement geometry is simplified, then device complexity is reduced, but control over trigger release precision is worsened

Engineering Contradiction:

Improvetrigger assembly complexityVSAvoidtrigger release precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The sear engagement surfaces utilize curved geometries rather than simple flat surfaces. The sear engagement surface on the trigger bar and the corresponding surface on the sear are designed with specific radii of curvature that guide the disengagement path. This curvature provides progressive contact and controlled release, improving trigger break precision without requiring complex additional components.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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

The trigger assembly provides enhanced safety by minimizing accidental discharges while maintaining precision shooting capabilities, ensuring controlled and reliable firearm operation.

Implementation Method 1

the upper leg deflectable from a default leg shape to a disconnected leg shape

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

the sear engagement lug contacting the striker engagement surface in primary engagement region

Methodology Applied

Scientific EffectMechanical contact: Mechanical Force

Data Source

PatentUS12571602B2Trigger assembly

Publication Date: 2026.03.10 SHADOW SYSTEMS LLC

AI summary

A trigger assembly can include a sear defining a trigger bar engagement surface and a reset notch; and a trigger bar including an upper leg, the upper leg defining a sear engagement surface, the upper leg deflectable from a default leg shape to a disconnected leg shape, the sear engagement surface laterally aligned with the trigger bar engagement surface when the upper leg is in the default leg shape, the sear engagement surface laterally misaligned from the trigger bar engagement surface when the upper leg is in the disconnected leg shape.