Firearm Sear Safety Mechanism with Detent Pin Lock
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Solution Overview
Problem
Semi-automatic firearms lack effective mechanisms to prevent unintentional discharge due to the lack of reliable safety devices that can securely lock the sear mechanism, leading to potential accidental firings.
Innovation Solution
A sear safety mechanism for semi-automatic pistols that includes a manual safety mode selection mechanism with a lever, pivot pin, and detent pin, allowing users to manually switch between unlocked and locked positions, preventing the sear from rotating and thus preventing accidental discharge by securing it against a hard stop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a manual safety mechanism is added to prevent unintentional discharge, then safety reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the safety mechanism with the existing trigger group components. The sear safety lever integrates with the sear, trigger bar, and firing element assembly, merging multiple functions into a unified structure rather than adding a separate independent safety device. This reduces overall device complexity while maintaining safety reliability.
Solution Approach 2:
The sear safety mechanism serves multiple functions: it prevents unintentional discharge by blocking the sear, allows manual engagement/disengagement by the user, and integrates with the existing trigger pull mechanism. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while improving safety reliability.
2Reliability
If a sear locking mechanism is implemented to prevent rotation, then safety reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The sear safety lever is designed to be automatically engaged when the sear is in the forward position, eliminating the need for separate manual intervention. The mechanism uses the natural movement and positioning of the sear itself to trigger the safety engagement, making the system self-regulating and easy to operate without adding complex control steps.
Solution Approach 2:
The safety mechanism transitions from a static locked position to a dynamic state where the sear can move forward to engage the safety lever. This dynamic interaction allows the sear to automatically engage or disengage the safety based on its position, maintaining ease of operation while ensuring reliability when needed.
3Reliability
If the sear is secured against a hard stop to prevent accidental firing, then safety reliability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the safety function from a separate complex mechanism and integrates it directly into the existing sear and trigger group assembly. By embedding the safety lever and its interaction with the hard stop within the current structural framework, the design avoids adding external complexity while achieving enhanced safety reliability through the hard stop engagement.
Data Source
AI summary
A sear safety for a firearm is provided that includes a mode selection mechanism having a detent pin movable from an unlocked position to a locked position by a user. The sear includes a body having a first leg and a second leg. The body is pivotable about a pivot point between the first leg and the second leg. The sear has a first end surface on the first leg for contacting the firing element and a second end surface on the second leg for contacting a hard stop on the frame and for contacting the trigger bar. A pocket is on the second leg for receiving the detent pin when the detent pin is in the locked position to secure the sear against the hard stop. When the detent pin of is in the locked position, the sear is prevented from to rotating about its pivot point.