Firearm Sear Pivot Point and Magazine Detection Mechanism
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Solution Overview
Problem
Existing semiautomatic handgun fire control mechanisms, particularly those with pivotable hammers or striker-type firing pins, tend to rotate easily due to uneven mass distribution, leading to unintended discharge and lack of safety features to prevent unauthorized use without a magazine.
Innovation Solution
A rocker-like sear with a pivot point at its center of mass, coupled with a magazine detection mechanism that inhibits trigger engagement without a magazine, ensuring the handgun remains inoperative unless a magazine is inserted, and a sear design that requires a positive force to rotate, enhancing safety and preventing unauthorized discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pivot point is located at one end of the elongated sear element, then the sear can be easily rotated about the pivot point, but the sear becomes unstable and rotates too easily due to uneven mass distribution
Solution Approach 1:
The patent applies asymmetry by deliberately positioning the pivot point at one end of the elongated sear element, creating an asymmetric mass distribution. This asymmetric design allows the sear to rotate easily about the pivot point while maintaining structural integrity and functional reliability in the firing mechanism.
2Ease of operation
If the sear mass is concentrated at one point distal from the pivot point, then the sear rotates easily about the pivot point, but the sear becomes overly sensitive to unintended rotation
Solution Approach 1:
The patent segments the sear element into distinct functional portions: a forward portion for trigger bar engagement and a rearward portion for firing pin engagement. This segmentation allows each portion to perform its specific function while the overall mass distribution is optimized for controlled rotation about the pivot point.
Solution Approach 2:
The patent applies local quality by concentrating mass at specific locations within the sear element - particularly at the rearward portion for firing pin engagement. This localized mass concentration provides the necessary rotational characteristics while maintaining reliability through controlled mass distribution rather than uniform distribution.
3Ease of operation
If the trigger bar can always engage the sear, then the firearm can be operated freely, but unauthorized discharge may occur without a magazine inserted
Solution Approach 1:
The patent introduces a magazine detection mechanism as an intermediary between the trigger bar and the sear. This intermediary component detects whether a magazine is properly inserted and uses that information to control the engagement between the trigger bar and sear, preventing unauthorized discharge while allowing legitimate operation.
Solution Approach 2:
The patent implements preliminary action by requiring the magazine to be inserted and detected before the trigger bar can engage the sear. The magazine detection mechanism performs its function in advance, establishing the proper configuration before the firing sequence can be initiated, thus preventing unauthorized use.
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
The solution provides a more stable sear mechanism that reduces accidental discharges and ensures the handgun is securely disabled without a magazine, enhancing user safety and preventing unauthorized use.
Implementation Method 1
A sear biasing member such as a spring biases the sear in a first pivotal direction for engaging the firing pin
Implementation Method 2
Rearwards movement of the trigger bar causes the trigger bar to engage the forward sear portion and pivot the sear in a second pivotal direction
Data Source
AI summary
A firearm includes a frame and a slide. A firing mechanism for the firearm includes a striker-type firing pin, a trigger, and a trigger bar. A sear inside the frame is pivotally balanced about a central fulcrum, and is biased in a first pivotal direction by a spring. In this position, a rear portion of the sear engages the firing pin. Actuation of the trigger causes the trigger bar to move rearwards for engagement of a forward portion of the sear. This pivots the sear in a second pivotal direction, against the spring, which releases the firing pin. The spring then causes the sear to pivot back for reengaging the firing pin when it returns to its rear position. Movement of the slide to a retired position causes the trigger bar to disengage from the sear (preventing discharge of the firearm) until the slide returns to a battery position.