Oil-Impregnated Bushing Trigger Assembly for Polymer Pistols
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Solution Overview
Problem
Prior trigger systems for polymer-frame pistols suffer from stacked tolerances leading to trigger slop and sub-optimal trigger feel and response, as they are not true 'flat-pull' triggers, which can result in unsafe low trigger pull weights and increased risk of accidental discharge.
Innovation Solution
The implementation of a trigger assembly with an oil-impregnated bushing and a trigger body featuring a lazy-L contact surface, along with a spring and safety mechanism, which reduces lateral movement and maintains a stock trigger pull weight, enhancing mechanical advantage and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional trigger system is used in polymer-frame pistols, then the device complexity is reduced and ease of manufacture is improved, but trigger slop increases and trigger feel deteriorates due to stacked tolerances
Solution Approach 1:
An oil-impregnated bushing is introduced as an intermediary component between the trigger body and trigger bar. This bushing acts as a precision bearing surface that eliminates lateral movement and trigger slop while maintaining ease of manufacture. The bushing absorbs tolerance stack-up that would otherwise degrade trigger precision, providing a true flat-pull trigger experience without significantly increasing device complexity.
2Manufacturing precision
If trigger lateral movement is reduced to eliminate trigger slop, then trigger precision is improved, but the trigger pull weight may become unsafe if not properly balanced
Solution Approach 1:
The trigger system modifies geometric parameters through the lazy-L contact surface configuration and oil-impregnated bushing placement. These parameter changes optimize the balance between lateral movement reduction and trigger pull weight maintenance. The bushing diameter, contact surface angle, and spring pre-load are carefully selected to eliminate slop while preserving a safe, substantial trigger pull weight that prevents accidental discharge.
3Ease of operation
If a true flat-pull trigger configuration is implemented, then trigger feel is improved, but the device complexity increases due to additional components like oil-impregnated bushing
Solution Approach 1:
The oil-impregnated bushing is designed to be self-lubricating, eliminating the need for external lubrication maintenance. The bushing material inherently provides low friction and wear resistance, allowing the trigger system to maintain optimal performance without additional complexity in lubrication systems. This self-service characteristic offsets the added component complexity by reducing maintenance requirements.
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 configuration reduces trigger slop, improves trigger feel and response, and maintains a safe trigger pull weight, providing a more ergonomic and reliable shooting experience.
Implementation Method 1
an oil-impregnated bushing disposed within the through hole
Data Source
AI summary
Exemplary trigger systems reduce trigger slop in polymer-framed pistols. Via use of an oil-impregnated bushing, stacked tolerances are reduced and/or eliminated, leading to improved trigger feel and function.