Pin Retention Clip Prevents Trigger Assembly Rotation
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Solution Overview
Problem
Existing trigger pin systems for guns are cumbersome to install and can lead to cross-threading, stripping of threads, or pin rotation, which compromises the secure retention of the trigger assembly.
Innovation Solution
A pin retention clip system comprising a pair of pins with flat surfaces and a clip that prevents pin rotation, allowing for quick and secure installation and removal of the trigger assembly using a small screwdriver, without the need for additional tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional trigger pin systems with multiple screws and wrenches are used, then secure retention is achieved, but installation complexity and time increase
Solution Approach 1:
The retention system is divided into modular components: a trigger pin with integrated screw, a separate retaining clip, and a trigger assembly. This segmentation allows the pin to be pre-assembled with the screw, eliminating the need for multiple separate fastening operations and reducing installation complexity while maintaining secure retention through the clip mechanism.
Solution Approach 2:
A retaining clip is introduced as an intermediary component between the trigger pin and the trigger assembly. The clip serves as a mediator that secures the pin in place without requiring direct threading into the trigger, thereby simplifying the overall assembly process while ensuring reliable retention through the clip's engagement with the pin's groove.
2Reliability
If internally threaded pins with screws are used, then retention is achieved, but risk of cross-threading and thread stripping increases
Solution Approach 1:
The screw-threading function is extracted from the pin itself and relocated to the retaining clip. The pin becomes a simple smooth cylinder without internal threads, eliminating the vulnerability to cross-threading and thread stripping. The clip performs the retention function through friction and mechanical engagement rather than threaded fastening.
Solution Approach 2:
The design accepts that the retaining clip may wear or deform over time, but this does not compromise the pin or trigger assembly. The clip acts as a sacrificial component that can be replaced if needed, protecting the more critical threaded components from damage while maintaining retention security throughout the system's service life.
3Reliability
If flanged pins with grooves are used, then pin retention is achieved, but pin rotation is possible
Solution Approach 1:
The retaining clip is designed with an asymmetric geometry that includes a groove matching the asymmetric features on the pin. This asymmetric engagement creates a mechanical interlock that prevents rotational movement of the pin within the trigger assembly, while still allowing for easy installation and removal by manipulating the clip's asymmetric features.
Solution Approach 2:
The solution moves from preventing rotation through pin features (grooves, flats) to preventing rotation through the clip's engagement geometry. The clip introduces a new dimension of control by using its own structural features to constrain the pin's rotational freedom, rather than relying solely on the pin's own geometric constraints.
Data Source
AI summary
A trigger assembly retention apparatus. It is useful in allowing the easy removal and reinsertion of a trigger assembly of a gun for cleaning, replacement, inspection or the trigger assembly or any other reason.