Auto Sear Pivot Mechanism for Continuous Fire Control
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Solution Overview
Problem
Existing firearm technologies lack an efficient mechanism for converting semi-automatic firearms to full-automatic operation without interference from the disconnector, limiting the continuous firing capability.
Innovation Solution
A pivotally mounted auto sear with a multi-bended and angular configuration, featuring lower and upper trip engagement locations, allows the hammer to reciprocate freely between the firing pin and carrier resetting positions, enabling continuous full-auto fire without disconnector interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional disconnector mechanism is used in semi-automatic firearms, then the firearm can prevent accidental discharge and control firing cycles, but it interferes with continuous full-automatic firing capability
Solution Approach 1:
The invention extracts and removes the disconnector component from the fire control group when converting to full-automatic operation. By taking out the disconnector that prevents continuous firing, the patent enables uninterrupted full-automatic fire while maintaining the safety selector switch for mode control
Solution Approach 2:
The patent implements dynamic reconfiguration of the fire control group based on the selector switch position. In semi-automatic mode, the disconnector is engaged for safety control; in full-automatic mode, the system dynamically disables the disconnector's interfering function, allowing the hammer to reciprocate freely for continuous firing
2Ease of operation
If the disconnector is engaged to control firing cycles in semi-automatic mode, then safe operation is ensured, but the hammer cannot reciprocate freely for continuous firing
Solution Approach 1:
The fire control group dynamically changes its mechanical state based on selector switch position. In full-automatic mode, the system transitions from a controlled state with disconnector engagement to an uncontrolled state where the hammer reciprocates freely without disconnector interference, maximizing firing rate
3Adaptability or versatility
If a three-position fire control selector is used to enable full-auto fire, then firing mode versatility is improved, but the disconnector still interferes with continuous firing operation
Solution Approach 1:
The fire control group is segmented into functionally independent components: the selector switch for mode selection and the disconnector for cycle control. By separating these functions, the patent allows the selector to enable full-automatic mode while the disconnector can be independently disabled or removed to eliminate interference with continuous firing
Solution Approach 2:
The invention extracts the disconnector from the active mechanism in full-automatic mode. By removing or disabling the disconnector when the full-auto selector position is engaged, the patent eliminates the component that would otherwise interrupt continuous firing, while preserving the selector's versatility for mode control
Data Source
AI summary
An auto sear for a firearm having a lower receiver with a trigger, disconnector and hammer, and an upper receiver with a reciprocating bolt carrier group. The sear includes a body pivotally mounted within the lower receiver rearwardly of the trigger, disconnector and hammer. The body includes a forward-most planar shaped portion in which are configured each of lower and upper trip engagement location. Upon the hammer initially striking the firing pin, the bolt carrier subsequently displaces rearwardly following cartridge discharge in order to rotate the hammer downwardly into contact with the lower trip engaging location. Upon a return forward displacement of the bolt carrier, an underside ledge thereof contacts the upper trip engaging location in order to pivot the lower engaging location out of contact with the hammer, permitting the same to rotate back into striking contact with the firing pin.