Firearm Safety SEAR Block Secondary Surface
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Solution Overview
Problem
The existing safety mechanism in firearms like the Sig Sauer P320 does not prevent the sear from moving under external forces even when the safety lever is in the 'safe' position, potentially leading to accidental discharges.
Innovation Solution
A backward-compatible safety kit that replaces the factory-installed safety lever and sear with improved components, featuring a secondary safety surface that engages the sear to maintain it in a restraining position when the safety is in the 'safe' condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional safety mechanism blocks the trigger bar from moving, then the trigger cannot be pulled, but the sear can still move under external forces leading to potential accidental discharge
Solution Approach 1:
The safety mechanism is segmented into two independent functions: (1) trigger bar blocking to prevent intentional firing, and (2) sear blocking via the secondary safety surface to prevent accidental firing. This segmentation allows each function to address specific failure modes independently, resolving the contradiction between safety reliability and accidental discharge prevention.
Solution Approach 2:
The secondary safety surface acts as an intermediary blocking element between the sear and any forces that might cause unintended movement. When engaged, this intermediate surface prevents the sear from moving forward even if external forces are applied to the trigger or firearm, thereby eliminating the harmful effect of accidental discharge while maintaining the primary safety function.
2Ease of operation
If the safety lever blocks the trigger bar, then trigger motion is prevented, but the sear remains vulnerable to movement from other actions
Solution Approach 1:
The safety lever is designed to simultaneously perform two functions: blocking the trigger bar through its primary blocking surface and blocking the sear through its secondary safety surface. This merging of functions into a single operable component maintains ease of operation while significantly improving sear position stability and overall safety reliability.
Solution Approach 2:
The safety lever is designed as a multi-functional component that provides both trigger bar blocking and sear blocking capabilities. This universal design allows a single safety mechanism to address multiple potential failure modes, ensuring that the ease of operation is maintained while comprehensively preventing both intentional and accidental firing.
3Device complexity
If only trigger bar blocking is implemented, then simple safety is achieved, but sear movement under external forces is not prevented
Solution Approach 1:
The safety mechanism extends from one-dimensional trigger bar blocking to two-dimensional protection by adding the secondary safety surface that blocks the sear. This dimensional expansion adds a new layer of protection against sear displacement hazards while maintaining relatively simple overall structure, as the additional blocking surface is integrated into the existing safety lever geometry.
Data Source
AI summary
A pistol comprising a frame; a striker connected to the frame and movable between a rearward energized position and a forwarded striking position; a trigger; a sear responsive to the trigger and operable to restrain the striker in the rearward position and release the striker to the forward position; a safety element movable between a live condition in which trigger motion to release of the striker is enabled and a safe condition in which trigger motion to release of the striker is disabled; and the safety element including a secondary safety surface operably engaging the sear to maintain the sear in a retraining position when the safety element is in the safe condition.