Firearm Trigger Unit Layout for Safe Selector Switching
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Solution Overview
Problem
Existing firearm triggers often prevent the fire-control/safety selector from being adjusted to the 'safe' position when the hammer is in the behind or downward position, and require complex geometric dependencies and multiple springs that are difficult to maintain, while also lacking distinguishable two-stage trigger resistance.
Innovation Solution
A trigger unit design with a rotatable hammer, trigger lever, and sear having a common axis, allowing the fire-control/safety selector to be adjusted to the 'safe' position regardless of the hammer's position, and incorporating a two-stage or three-stage trigger mechanism with distinct resistance levels, using a simplified component arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional trigger mechanism is used, then the structure is simple, but the trigger finger cannot be kept in a relaxed state and must be continuously applied force to prevent unintended discharge
Solution Approach 1:
The trigger mechanism is divided into distinct functional components: a trigger finger support portion that provides a resting platform for the trigger finger, and a trigger discharge prevention portion that independently manages the discharge prevention function. This segmentation allows the trigger finger to be supported in a relaxed state while maintaining discharge prevention capability through separate mechanical means.
Solution Approach 2:
A trigger finger support portion is introduced as an intermediary element between the trigger finger and the trigger mechanism. This support portion provides a dedicated resting platform that eliminates the need for continuous finger pressure while ensuring the trigger remains properly positioned for controlled discharge when needed.
2Ease of operation
If the trigger mechanism allows easy operation, then the ease of operation is improved, but the reliability of preventing unintended discharge deteriorates
Solution Approach 1:
The discharge prevention function is extracted from the trigger finger operation itself and implemented through a separate trigger discharge prevention portion. This independent mechanism ensures that even when the trigger is in a relaxed state, the discharge prevention function remains actively engaged, eliminating the trade-off between ease of operation and discharge prevention reliability.
Solution Approach 2:
The trigger finger support portion provides a pre-positioned resting platform that cushions and supports the trigger finger in a relaxed state before any discharge action is taken. This beforehand support ensures the finger is properly positioned and maintained in a safe, relaxed state without requiring continuous active pressure, while the discharge prevention mechanism remains independently engaged.
3Volume of moving object
If the trigger mechanism is compact, then the size is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The trigger finger support portion and trigger discharge prevention portion are merged into an integrated trigger mechanism assembly. This combining of functions into a single cohesive structure achieves compact dimensions while the modular design of the integrated components actually reduces manufacturing precision requirements compared to separate, less-coordinated components.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention concerns a trigger unit (20) for a firearm, comprising a rotatable trigger lever (26), in which the trigger lever (26) has a trigger bar (264) which, lies below the trigger axis (262) and is moved when the trigger bar (264) is actuated against a barrel direction (91), and a fire-control/ safety selector (60) for selecting at least one "safe" and one "fire" position, wherein a locking lever (620) rotatable mounted about a locking lever axis (641) is arranged in the trigger unit (20) and is biased in a circumferential direction by a locking lever spring (630), and that the locking lever axis (641), when viewed in the barrel direction (91), is arranged behind the trigger axis (262), and the locking lever (620) is designed to releasable fix the fire-control/ safety selector (60) in a selectable position.