External Sear Spring Tension Adjustment via Modified Housing
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Solution Overview
Problem
Adjusting the tension of the fire control mechanism in 1911-style handguns requires partial disassembly and manual bending of the sear spring, which is tedious, error-prone, and risks damage, often necessitating professional assistance and significant time or expense.
Innovation Solution
An adjustable tension system that allows external adjustment of the sear spring tension using a modified mainspring housing and spring engaging mechanism, eliminating the need for disassembly and manual bending, and incorporating a device securing mechanism to prevent vibration and ensure secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual bending of the sear spring is used to adjust tension, then tension adjustment is achieved, but the process becomes tedious and error-prone requiring disassembly
Solution Approach 1:
A tension adjusting tool serves as an intermediary device between the user and the sear spring. The tool includes a engagement component that interfaces with the sear spring and an adjustment mechanism that the user operates externally. This mediator enables tension adjustment without direct manual bending or disassembly, resolving the contradiction by making the process easier while avoiding increased device complexity.
Solution Approach 2:
The sear spring is designed with an engagement feature that allows the tension adjusting tool to interface with it directly. The spring's own structure provides the means for its own tension adjustment through the tool, eliminating the need for disassembly. The system uses the spring's existing geometry to enable self-adjustment, resolving the contradiction between ease of operation and device complexity.
2Ease of operation
If manual bending of the sear spring is used to adjust tension, then tension adjustment is achieved, but damage risk increases
Solution Approach 1:
The tension adjusting tool acts as a protective intermediary that distributes adjustment forces evenly across the sear spring through its engagement component. This prevents concentrated stress points that could cause damage during manual bending. The tool mediates between the user's adjustment actions and the spring, ensuring forces are applied within safe limits while maintaining adjustment capability.
Solution Approach 2:
The engagement component of the tension adjusting tool is designed with cushioning or load-distributing features that prevent excessive force application to the sear spring. The tool structure inherently limits the maximum force that can be applied during adjustment, providing beforehand protection against damage while still enabling effective tension adjustment.
3Measurement precision
If professional assistance is sought for tension adjustment, then adjustment precision is improved, but time and expense increase
Solution Approach 1:
The tension adjusting tool is designed to be user-operated without requiring professional gunsmithing skills. The adjustment mechanism provides visual or tactile feedback that guides the user to achieve proper tension settings independently. This self-service capability delivers professional-level precision while eliminating the time loss associated with seeking external assistance.
Solution Approach 2:
The tension adjusting tool incorporates feedback mechanisms that provide the user with real-time information about the adjustment progress and achieved tension level. This feedback enables the user to make precise adjustments independently, achieving professional-quality results without the time expense of external assistance.
4Adaptability or versatility
If the sear spring is accessed for adjustment, then tension modification is possible, but disassembly is required
Solution Approach 1:
The tension adjusting tool serves as an intermediary that reaches the sear spring through existing access points or external interfaces without requiring disassembly. The tool's design allows it to interface with the spring through the firearm's normal exterior surfaces, enabling tension modification while maintaining ease of operation by avoiding disassembly.
Solution Approach 2:
The adjustment mechanism operates from an external dimension or direction that does not require internal access to the sear spring. By applying adjustment forces from outside the firearm's main assembly, the system enables tension modification without disassembly, resolving the contradiction between adaptability and ease of operation.
Data Source
AI summary
A system that allows a person to adjust the tension of the fire control mechanism of a firearm from outside the firearm so the firearm does not need to be disassembled to make such adjustments. The system has a modified mainspring housing or modified grip safety that supports a spring engaging mechanism which engages the sear spring of the fire control mechanism. In one configuration, first and second apertures extend through the housing body and an engaging device, such as a screw, is received in each aperture to contact different segments of the sear spring. From outside the firearm, the user moves a device forward or rearward in an aperture to apply more or less force to the sear spring segment to adjust the fire control mechanism. The sear spring can be modified so a sear spring segment has an enlarged area that is contacted by its engaging device.