Colt 1911 Trigger Safety Relocation
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Solution Overview
Problem
The Colt model 1911 pistol's design requires shooters to consciously disengage the thumb safety during high-stress situations, leading to potential delays in firing due to the need for thumb movement, which can be fatal in tense conditions.
Innovation Solution
A two-stage trigger assembly with a secondary trigger shoe that blocks movement until finger pressure is applied, relocating the final safety to the trigger, allowing immediate firing without thumb movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thumb safety is used in the favored carry mode, then the pistol safety is improved, but the time to fire the pistol increases due to required thumb movement
Solution Approach 1:
The trigger assembly is segmented into two distinct functional stages: a first stage trigger shoe that provides the final safety function, and a second stage trigger shoe that enables firing. This segmentation allows the safety function to be separated from the thumb safety mechanism, eliminating the need for thumb movement while maintaining safety through the trigger-based blocking system.
Solution Approach 2:
The first stage trigger shoe acts as an intermediary blocking mechanism that prevents trigger movement and sear engagement until deliberately actuated. This intermediary component bridges the safety requirement and the firing action, allowing the shooter to maintain safety without thumb intervention while enabling rapid firing when the first stage trigger shoe is pushed.
2Reliability
If the thumb safety is placed in the safe position, then the pistol prevents accidental discharge, but the shooter must consciously disengage it during high-stress situations
Solution Approach 1:
The trigger assembly serves the dual function of both safety blocking and firing initiation through its two-stage design. The first stage trigger shoe automatically provides the final safety function without requiring separate thumb safety manipulation, making the system self-sufficient and eliminating the cognitive burden of remembering to disengage the thumb safety under stress.
Solution Approach 2:
The safety function and trigger function are merged into a single integrated two-stage trigger assembly. The first stage trigger shoe combines the blocking safety mechanism with the trigger pull function, eliminating the need for separate thumb safety operations and simplifying the user interface to a single intuitive action.
3Reliability
If a two-stage trigger assembly is implemented, then the final safety is relocated to the trigger, but the device complexity increases
Solution Approach 1:
The first stage trigger shoe is nested within or integrated with the second stage trigger shoe, creating a compact two-stage assembly. This nesting arrangement allows the blocking safety mechanism to be housed within the existing trigger assembly footprint, minimizing additional space requirements and reducing overall structural complexity despite the added functional stage.
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
This solution reduces the time to fire the pistol under stressful conditions by moving the final safety to the trigger, eliminating the need for thumb movement and ensuring quicker response times.
Implementation Method 1
The secondary trigger shoe is held in place within the primary trigger by a spring and pin
Implementation Method 2
a spring and pin which functions as an axle on which the secondary trigger shoe is allowed to rotate
Data Source
AI summary
This device is a trigger safety designed for use on the Colt model 1911 pistol and clones of the same design. The primary safety of the 1911 design is a thumb safety located on the left rear of the firearm. The location of the thumb safety is not an issue under normal circumstances, but in high stressful situations where the shooter is anticipating the firing of the firearm the thumb safety location is troublesome. Under stress the shooter may forget that the thumb safety is engaged, and may pull the trigger without the gun firing. The time needed to disengage the thumb safety may result in a life or death situation. This device incorporates a two stage safety in the trigger system that functions when all other safeties are in the off position. The location within the trigger eliminates the fractional second delay that the thumb safety may cause.