Hammer Sear Assembly Drop-In Installation Wear Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Firearm components, such as hammers and sears, often require modification or replacement due to wear and manufacturing tolerances, necessitating a customizable and durable fire control system that maintains precise operational parameters.
Innovation Solution
A fire control system comprising a hammer with a safety notch and a spaced apart triggering surface, and a sear with safety and firing contact surfaces, where the firing contact surface is designed to avoid contact with the safety notch in both safety and firing positions, allowing for 'drop-in' installation and reducing wear by isolating contact points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hammers and sears are manufactured with standard tolerances, then manufacturing cost is reduced, but wear and operational precision deteriorate requiring frequent modification or replacement
Solution Approach 1:
The hammer and sear are pre-configured with specifically positioned contact surfaces and notches during manufacturing. The safety notch, triggering surface, safety contact surface, and firing contact surface are all precisely located in advance to ensure proper engagement geometry without requiring field adjustment or modification.
Solution Approach 2:
The invention changes the geometric parameters of the hammer and sear components by positioning the safety notch and triggering surface at specific spaced-apart locations. This parameter optimization ensures that contact occurs only at designated surfaces, preventing premature wear and maintaining operational precision throughout the component lifecycle.
2Ease of operation
If contact surfaces are closely spaced, then component size is reduced, but unintended contact between firing contact surface and safety notch increases causing operational interference
Solution Approach 1:
The hammer and sear contact interfaces are segmented into distinct functional zones. The safety contact surface and firing contact surface are separated and assigned to different engagement scenarios, with the safety notch positioned to engage only the safety contact surface while the triggering surface engages only the firing contact surface. This segmentation prevents cross-interference between safety and firing functions.
Solution Approach 2:
The safety notch acts as an intermediary geometric feature that mediates between the safety contact surface and the triggering surface. By positioning the safety notch to engage exclusively with the safety contact surface, it prevents the firing contact surface from inadvertently contacting the safety notch, thereby isolating the firing function from safety function interference.
3Reliability
If hammer and sear require precise alignment, then operational reliability is improved, but installation complexity increases
Solution Approach 1:
The invention applies local quality by creating specific geometric features at critical locations on the hammer and sear. The safety notch, triggering surface, safety contact surface, and firing contact surface are each designed with specific local geometries that guide proper alignment during installation. These localized geometric cues ensure that when components are assembled, they naturally align to the correct positions without requiring complex alignment procedures.
Data Source
AI summary
A hammer and a sear for a fire control system includes a safety notch and a spaced apart triggering surface on the hammer and a firing contact surface and a safety contact surface on the sear. The firing contact surface of the sear is precluded from contacting the safety notch of the hammer in both a safety position of the hammer and the sear and a firing position of the hammer and the sear. Further, a normal to the firing contact surface extends through a pivot pin that provides rotation of the sear.